CA2152960A1 - Method and apparatus for operating geography-altering machinery relative to a work site - Google Patents
Method and apparatus for operating geography-altering machinery relative to a work siteInfo
- Publication number
- CA2152960A1 CA2152960A1 CA002152960A CA2152960A CA2152960A1 CA 2152960 A1 CA2152960 A1 CA 2152960A1 CA 002152960 A CA002152960 A CA 002152960A CA 2152960 A CA2152960 A CA 2152960A CA 2152960 A1 CA2152960 A1 CA 2152960A1
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- CA
- Canada
- Prior art keywords
- machine
- site
- model
- geography
- determining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/2025—Particular purposes of control systems not otherwise provided for
- E02F9/2045—Guiding machines along a predetermined path
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B79/00—Methods for working soil
- A01B79/005—Precision agriculture
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/004—Devices for guiding or controlling the machines along a predetermined path
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D1/00—Control of position, course or altitude of land, water, air, or space vehicles, e.g. automatic pilot
- G05D1/02—Control of position or course in two dimensions
- G05D1/021—Control of position or course in two dimensions specially adapted to land vehicles
- G05D1/0276—Control of position or course in two dimensions specially adapted to land vehicles using signals provided by a source external to the vehicle
- G05D1/0278—Control of position or course in two dimensions specially adapted to land vehicles using signals provided by a source external to the vehicle using satellite positioning signals, e.g. GPS
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D1/00—Control of position, course or altitude of land, water, air, or space vehicles, e.g. automatic pilot
- G05D1/02—Control of position or course in two dimensions
- G05D1/021—Control of position or course in two dimensions specially adapted to land vehicles
- G05D1/0231—Control of position or course in two dimensions specially adapted to land vehicles using optical position detecting means
- G05D1/0234—Control of position or course in two dimensions specially adapted to land vehicles using optical position detecting means using optical markers or beacons
- G05D1/0236—Control of position or course in two dimensions specially adapted to land vehicles using optical position detecting means using optical markers or beacons in combination with a laser
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D1/00—Control of position, course or altitude of land, water, air, or space vehicles, e.g. automatic pilot
- G05D1/02—Control of position or course in two dimensions
- G05D1/021—Control of position or course in two dimensions specially adapted to land vehicles
- G05D1/0255—Control of position or course in two dimensions specially adapted to land vehicles using acoustic signals, e.g. ultra-sonic singals
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D1/00—Control of position, course or altitude of land, water, air, or space vehicles, e.g. automatic pilot
- G05D1/02—Control of position or course in two dimensions
- G05D1/021—Control of position or course in two dimensions specially adapted to land vehicles
- G05D1/0257—Control of position or course in two dimensions specially adapted to land vehicles using a radar
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D1/00—Control of position, course or altitude of land, water, air, or space vehicles, e.g. automatic pilot
- G05D1/02—Control of position or course in two dimensions
- G05D1/021—Control of position or course in two dimensions specially adapted to land vehicles
- G05D1/0268—Control of position or course in two dimensions specially adapted to land vehicles using internal positioning means
- G05D1/0274—Control of position or course in two dimensions specially adapted to land vehicles using internal positioning means using mapping information stored in a memory device
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D2201/00—Application
- G05D2201/02—Control of position of land vehicles
- G05D2201/0202—Building or civil engineering machine
Abstract
A method and apparatus for operating geography-altering machinery such as a track-type tractor, road grader, paver or the like relative to a work site to alter the geography of the site toward a desired condition. A first digital three-dimensional model (104) of the desired site geography, and a second digital three-dimensional model (106) of the actual site geography are stored in a digital data storage facility (126). The machine (10) is equipped with a position receiver to determine in three-dimensional space the location of the machine (10) relative to the site (12). A dynamic database (400) receives the machine position information, determines the difference between the first and second site models (104, 106) and generates representational signals of that difference for directing the operation of the machine (10) to bring the actual site geography into conformity with the desired site geography. In one embodiment, the signals representing the machine position and the difference between the first and second site models (104, 106) used to generate an operator display (108) which is updated in real time. Alternately, the signals representing the difference between the first and second site models (104, 106) can be supplied to automatic machine controls (128) for autonomous or semi-autonomous operation of the machine (10).
Description
WO95/16228 _ PCT~S94/13143 METHOD AND APPARATUS FOR OPERATING GEOGRAPHY-ALTERING MACHINERY RELATIVE TO A WORK SITE
Field of the Invention This invention relates to the operation of machinery for altering the geography of a work site and, more particularly, to the real time generation and use of digital data which collectively represents the geography of the work site as it is being altered by the machinery toward a desired state.
As used in this patent specification the phrase "geography altering machinery" and various approximations thereof refer to self-propelled mobile machines such as track-type tractors, road graders, pavers and asphalt layers which exhibit both (l) mobility over or through a work site as a result of being provided with a prime mover (for example an engine) on a frame which drives wheels or tracks supporting the frame, and (2) the capacity to alter the geography of a work site as a consequence of the provision on the frame of a tool or tool set such as a blade, shovel, bucket, ripper or the like. Machinery such as track-type tractors, graders, pavers and asphalt layers is typically referred to as "earth moving machinery or equipment" and it is to be understood that these machines constitute a subcategory of the geography altering machinery with which this invention deals.
Backqround of the Invention Despite the development of sophisticated and powerful earthmoving machinery it remains a time consuming and labor intensive chore to recontour the 35 topography of a large plot of land, or to otherwise alter the geography of a work site such as a 2 ~ 2 9 6 PCT~S94/13143 construction area, mine, road or the like. Such operations sometimes involve the necessity of a survey which is currently carried out using line of sight optical instruments or other static, point-by-point measuring techniques to obtain the coordinates of a large number of points over the work site and to thereafter construct a three-dimensional model of the site. From the survey an architectural plan or target geography is developed. Thereafter the site is carefully marked with stakes of various colors to provide physical cues to the operator of geography altering machinery such as a track-type tractor as to how the machine should be operated to transform the work site from the original to the desired state.
Only the most skillful and experienced operators can achieve efficiency in recontouring a large land site, such difficulty being due in part to the absence of large scale as well as detailed information as to the progress being made in the revision of the site.
As a result most projects involving the alteration of the geography of large work sites are time consuming and labor intensive in the requirements for skilled personnel and large crews to direct the operation of earthmoving machinery and the like.
Additionally, for knowledge of the degree to which the original site geography has been brought into conformity with the desired geography, the operation is often interrupted while a survey crew verifies the amount of progress to date and manually updates the staking and marking o~ the site, as well as the site model. Between these occasional verifications the machinery operators and supervisors have no truly accurate way to measure their real time progress.
W09St16228 21 S 2 9 6 0 PCT~S94/13143 Summary Disclosure of the Invention The invention provides a solution to the long standing problems of operating machinery to accurately and efficiently alter the geography of a work site toward the desired condition. The subject invention achieves such geography alteration without the need for physical markers on the site to cue the operator, with only such interruptions in operation as are needed, for example, to refuel the machinery, and with a minimum need for crew.
In general this is accomplished through the provision of a digital data storage, retrieval and process facility which per se may be carried on the mobile machinery or located remotely from the machinery but connected, for example, by radio link to the machinery for storing, actually creating, and modifying a digital three-dimensional model of the site as it exists at any given time, as well as a digital model of the site as an architect, for example, wishes it to be.
The subject invention further comprises a mechanism by which the exact position in three-dimensional space of the mobile machine, or in certain cases the earth-contacting implement which is carried by the machine, can be accurately determined in real time; i.e., as it alters the geography of the site thereby to update the digital three-dimensional model, point by point and in real time as the machinery travels over or through it. As hereinafter described the preferred implementation of the invention involves the use of a phase differential GPS (global positioning system) receiver system which is capable of precisely locating an object in three-dimensional space to centimeter accuracy.
WO95/16228 2 1 5 2 9 6 0 PCT~S94/13143 The subject invention further comprises means for comparing the desired digital three-dimensional site model to the continuously updated actual digital three-dimensional site model and for generating signals representing the degree of alteration needed at each of a large number of coordinates over or through the work site to bring the actual model into conformity with the desired model.
These signals may in one instance provide real time displays on or off the machinery to cue the operator as to the machine's actual progress in real time and within a frame of reference which conveys information as to at least a substantial portion of the overall site. In another embodiment hereinafter described the signals representing the differences between the desired and actual three-dimensional models are applied to the real time automatic controls of the machine itself or a portion thereof or both.
In a preferred form at least a portion of the position-determining mechanism or system is carried on the machine itself as it traverses the site. Where the machine includes a separate earth-contacting implement, the position-determining system may be mounted on the implement itself. Where the implement is itself movable relative to the machine frame or carriage, for example a hydraulically-activated blade, bucket, or scraper, the implement can be provided with means to determine its elevation relative to the surface of the site.
According to another aspect of the invention a method is provided for directing the operations of a mobile geography-altering machine which comprises the steps of producing and storing in a digital data storage and retrieval means a first three-dimensional geographic site model representing the desired WO9S/16228 215 2 9 6 0 PCT~S94113143 geography of a site and a second three-dimensional geographic site model representing the actual geography of the site, thereafter generating digital signals representing in real time the instantaneous position in three-dimensional space of a mobile geography-altering machine or an implement carried thereby as it traverses and alters the site, utilizing the digital signals to update the second model, determining the difference between the first model and the updated second model and directing the operations of the machine in accordance with the difference to bring the updated second model into conformity with the first model.
In one embodiment the step of directing the operation of the machine is carried out by providing to a machine operator a display which informs the operator in real time of the instantaneous position of the mobile machine relative to the work site, the alterations which are needed to bring the site into conformity with the first three-dimensional model, and the actual progress being made toward the realization of the first model.
In another embodiment the step of directing the operations of the machine is carried out in an automatic or semi-automatic fashion by actually working through electrohydraulic actuators to control the position, elevation and direction of movement of the machine and/or the earth altering tool carried thereby.
In a preferred form at least a portion of the position-determining means is carried on the machine itself as it traverses the site. Where the machine includes a separate earth-contacting implement, the position-determining system may be mounted on the implement itself. Where the implement WO95/16228 PCT~S94/13143 is itself movable relative to the machine frame or carriage, the implement can be provided with means to determine its elevation relative to the surface of the site.
As hereinafter made more explicit, both the apparatus and the method aspects of the present invention can be achieved in various ways; for example, the digital data storage and retrieval facility as well as the updating and differencing means may be carried by and on the machine as part of an integral and comprehensive on-board machine system.
Alternately these means may be located at an off site or nearby facility for transmitting visual display signals or automatic control signals to the machine and for receiving updated position and site information from the machine during operation thereof.
As hereinafter described in detail the geography-altering machine may be earth-moving equipment such as a track-type tractor, grader, paver or asphalt layer. The machine may also be capable of underground or in ground operations such as the mobile machinery found in open pit or below ground mining operations, depending on the capabilities of the positioning system used.
In the preferred form the method and apparatus aspects of the invention are realized through the utilization of three-dimensional position information derived from global positioning satellites using a phase differential GPS receiver system. Such GPS receivers utilize signals from global positioning satellites as well as a differential signal from a local reference receiver of known position coordinates to generate position coordinate data to centimeter accuracy. Accordingly, the apparatus used to carry out the invention in the preferred form comprises a -WO95/16228 2 1 5 2 9 6 0 PCT~S94113143 GPS receiver havlng both GPS and local signal reception capabilities and, where a local reference signal at a geodetically surveyed site is not available, a temporary surveyed differential receiver/transmitter to provide the local data processing apparatus with a correction signal.
Alternately, raw position data can be transmitted from the reference receiver to the local data processor for comparison and correction with the information from the machine-mounted receiver.
According to another aspect of the invention means are provided for precisely generating and controlling displays which are suitable for use in performing operations to alter the geography of sites such as construction sites, mines, and roads so as to precisely display the progress being made by the mobile machine on an incremental basis wherein the display unit areas may or may not correspond to the sampling rate of the GPS receiver and digital processor system. As hereinafter described, the site, or a practically displayable portion thereof, is subdivided into a continuous matrix of unit areas of such size that the mobile machine may traverse these unit areas at a rate which is greater than the sampling rate of the GPS receiver and data processing facility. Algorithms are provided which take into account the physical parameters and dimensions of the earth-altering tool or implements and the relationship thereof to the physical machine and its path of travel. The unit areas of the display are filled in, colored, revised or otherwise altered in accordance with progress information derived from the GPS
receiver or other positioning system and the digital processing facility, in accordance with the WO95/16228 PCT~S94/13143 ~ 2ls29 6 0 hereinafter described laws of the algorithm which is in residence in the digital processing facility.
In one embodiment of the invention the real-time path of the machine relative to the site between position readings is determined with a differencing algorithm which determines an effective width of a geography-altering portion of the machine less than or equal to its actual width, and updates each portion of the site model which the effective width traverses.
In a preferred form, the instantaneous position of the machine as it traverses the site is tracked as a series of coordinate points on the site model. Where the rate at which the coordinate points are tracked is not synchronous with the rate of travel of the machine over the unit areas or grid elements of the site, the differencing algorithm determines the unit areas traversed by the geography-altering portion of the machine between coordinate points. Where the geography-altering portion is of a continuous width, for example a blade or scraper element, the effective parameters of the blade are preferably set less than its actual parameters to ensure that only those portions of the site actually operated on by the blade are filled in, colored, revised or otherwise altered or marked to reflect the alterations to the site and the current difference between the actual and desired site models.
As will be made more clear, an initial site survey may be created in a variety of ways so as to constitute the first three-dimensional geographic site model. In one embodiment or utilization of the invention the first model may be created using standard state-of-the-art site surveying methods and thereafter the data from such state-of-the-art survey digitized in accordance with the physical and data WO95/16228 215 2 9 6 0 PCT~S94/13143 processing requirements of the particular digitizing and data processing system used. Alternatively the actual site geography model may be created by traversing the site with the geography-altering machine itself or through the use of special machinery and/or vehicles which are suited to the conditions.
For example, a smooth, relatively refined topographical site may be traversed by a pickup truck whereas a less refined or more rugged site may require a special vehicle or even a receiver, digitizing and/or storage facility carried by a person who traverses the site on foot. In another alternative a particularly difficult site may be surveyed by air using stereo photography or holography equipment. In a still further alternative, underground geology may be surveyed by or through the making of numerous core samples at various locations and at various depths in constructing underground site model from such samples.
Brief Descri~tion of the Drawinqs FIGURE 1 is a schematic representation of a machinery position and control method according to the present invention;
FIGURE 2 is a schematic representation of an apparatus which can be used in connection with the receipt and processing of GPS signals to carry out the present invention;
FIGURE 3 is a detailed schematic representation of an embodiment of the system of Figure 2 using GPS positioning;
FIGURE 4 is a schematic representation of a work site, geography altering machine, and position and control system according to an illustrative earth contouring embodiment of the present invention;
WO95/16228 ~ PCT~S94tl3143 21~96 -10-FIGURE 4A shows an alternate arrangement of the machine-mounted positioning system of Figure 4;
FIGURES 5A-5B are graphic reproductions of exemplary digitized site models such as used with the present invention;
FIGURES 6A-6D are representative real-time operator displays generated according to the present invention for an earth contouring operation as in Figure 4;
FIGURES 7A-7D are flowchart representations of a dynamic site database according to the present invention; and FIGURE 8 is a schematic representation of the system of the present invention including a closed-loop automatic machine control system.
Description of the Invention Referring to Figure 1, the method of the present invention is shown schematically. Using a known three-dimensional positioning system with an external reference, for example 3-D laser, GPS, GPS/laser combinations or radar, machine or tool position coordinates are determined in block 100 as the machine moves over the site. These coordinates are instantaneously supplied as a series of discrete points to a differencing algorithm at 102. The differencing algorithm calculates the machine position and path in real time. Digitized models of the actual and desired site geographies are loaded or stored at block 104, an accessible digital storage and retrieval facility, for example a local digital computer. The differencing algorithm 102 retrieves, manipulates and updates the site models from 104 and generates at 106 a dynamic site database of the difference between the actual site and the desired site model, updating the ~ WO95/16228 2 1 5 2 9 6 ~ PCT~S94/13143 actual site model in real-time as new position information is received from block lO0. This dynamically updated site model is then made available to the operator in display step 108, providing real time position, direction and site geography/
topography updates in human readable form. Using the information from the display the operator can efficiently monitor and direct the manual control of the machine at lO9.
Additionally, or alternately, the dynamic update information can be provided to an automatic machine control system at llO, for example an electrohydraulic control system of the type developed by Caterpillar Inc. and used to operate the various pumps, valves, hydraulic cylinders, motor/steering mechanisms and other controls used in geography-altering machinery. The electrohydraulic controls can provide an operator assist to minimize machine work and limit the manual controls if the operator's proposed action would, for example, overload the machine. Alternately, the site update information from the dynamic database can be used to provide fully automatic machine/ tool control.
It will be clear from the foregoing that with the present method the initial, actual site geography/ topography model can be generated by the machine itself on previously unsurveyed terrain. By simply moving the machine over a proposed site in a regular pattern, the geography of the site can be determined relative to the desired architect's site model loaded at 104. After the machine has traversed the entire site to accurately determine its actual geography, the actual site model can then be monitored and updated in real time at 106 as the machine brings WO95/16228 21~ 2 9 6 ~ PCT~S94/13143 the actual geography into conformity with the desired site model.
Referring now to Figure 2, an apparatus which can be used in connection with the receipt and processing of GPS signals to carry out the present invention is shown in block diagram form comprising a GPS receiver apparatus 120 with a local reference antenna and a satellite antenna; a digital processor 124 employing a differencing algorithm, and connected to receive position signals from 120; a digital storage and retrieval facility 126 accessed and updated by processor 124, and an operator display and/or automatic machine controls at 128 receiving signals from processor 124.
GPS receiver system 120 includes a satellite antenna receiving signals from global positioning satellites, and a local reference antenna. The GPS
receiver system 120 uses position signals from the satellite antenna and differential correction signals from the local reference antenna to generate position coordinate data in three-dimensions to centimeter accuracy for moving objects. Alternatively, raw data from the reference antenna can be processed by the system to determine the differential correction.
This position information is supplied to digital processor 124 on a real-time basis as the coordinate sampling rate of the GPS receiver 120 permits. The digital storage facility 126 stores a first site model of the desired site geography, for example according to an architect's plan, and a second digitized site model of the actual site geography, for example as initially surveyed. The site model corresponding to the actual site geography can be accessed and updated in real time by digital processor WO95/16228 '' 2 ~ 5 2 9 6 0 PCTtUS94tl3143 124 as it receives new position information from GPS
receiver 120.
Digital processor 124 further generates signals representing the difference between the continuously-updated actual site model and the architect's plan. These signals are provided to the operator display and/or automatic machine controls at 128 to direct the operation of the machine over the site to bring the updated actual site model into conformity with the architect's plan. The operator display 128, for example, provides one or more visual representations of the difference between the actual, continuously-updated site model and the desired site model to guide the operator in running the machine for the necessary geography-altering operations.
Referring now to Figure 3, a more detailed schematic of a system according to Figure 2 is shown using kinematic GPS for position reference signals. A
base reference module 40 and a-position module 50 together determine the three-dimensional coordinates of the geography-altering machine relative to the site, while an update/control module 60 converts this position information into real time representations of the site which can be used to accurately monitor and control the machine.
Base reference module 40 includes a stationary GPS receiver 16; a computer 42 receiving input from receiver 16; reference receiver GPS
software 44, temporarily or permanently stored in the computer 42; a standard computer monitor screen 46;
and a digital transceiver-type radio 48 connected to the computer and capable of transmitting a digital data stream. In the illustrative embodiment base reference receiver 16 is a high accuracy kinematic GPS
receiver; computer 4,2 for example is a 486DX computer W095/16228 r 2~.s296a PCT/US94/13143 with a hard drive, 8 megabyte RAM, two serial communication ports, a printer port, an external monitor port, and an external keyboard port; monitor screen 46 is a passive matrix color LCD; and radio 48 is a commercially available digital data transceiver.
Position module 50 comprises a matching kinematic GPS receiver 18, a matching computer 52 receiving input from receiver 18, kinematic GPS
software 54 stored permanently or temporarily in computer 52, a standard computer monitor screen 56, and a matching transceiver-type digital radio 58 which receives signals from radio 48 in base reference module 40. In the illustrative embodiment position module 50 is located on the geography-altering machine to move with it over the work site.
Update/control module 60, also carried on board the machine in the illustrated embodiment, includes an additional computer 62, receiving input from position module 50; one or more digitized site models 64 digitally stored or loaded into the computer memory; a dynamic database update module 66, also stored or loaded into the memory of computer 62; and a color operator display screen 22 connected to the computer. Instead of, or in addition to, operator display 22, automatic machine controls 70 can be connected to the computer to receive signals which operate the machine in an autonomous or semi-autonomous manner in known fashion.
Although update/control module 60 is here shown mounted on the mobile machine, some or all portions may be stationed remotely. For example, computer 62, site model(s) 64, and dynamic database 66 could be connected by radio data link to position module 50 and operator display 22 or machine control interface 70. Position and site update information W09S/16228 PCT~S94/13143 can then be broadcast to and from the machine for display or use by operators or supervisors both on and off the machine.
Base reference station 40 is fixed at a point of known three-dimensional coordinates relative to the work site. Through receiver 16 base reference station 40 receives position information from a GPS
satellite constellation, using the reference GPS
software 44 to derive an instantaneous error quantity or correction factor in known manner. This correction factor is broadcast from base station 40 to position station 50 on the mobile machine via radio link 48,58.
Alternatively, raw position data can be transmitted from base station 40 to position station 50 via radio link 48,58, and processed by computer 52.
Machine-mounted receiver 18 receives position information from the satellite constellation, while the kinematic GPS software 54 combines the signal from receiver 18 and the correction factor from 20 base reference 40 to determine the position of receiver 18 and the machine relative to base reference 40 and the work site within a few centimeters. This position information is three-dimensional and is available on a point-by-point basis according to the 25 sampling rate of the GPS system.
Referring to update/control module 60, once the digitized plans or models of the site have been loaded into computer 62, dynamic database 66 generates signals representative of the difference between actual and desired site geography to display this difference graphically on operator display screen 22.
For example, profile and/or plan views of the actual and desired site models are combined on screen 22 and the elevational difference between their surfaces is indicated. Using the position information received WO95/16228 ~ ~S 2 9 6 0 PCT~S94/13143 from position module 50, the database 66 also generates a graphic icon of the machine superimposed on the actual site model on display 22 corresponding to the actual position and direction of the machine on the site.
Because the sampling rate of the position module 50 results in a time/distance delay between position coordinate points as the machine moves over the site, the dynamic database 66 of the present invention uses a differencing algorithm to determine and update in real-time the path of the machine.
With the knowledge of the machine's exact position relative to the site, a digitized view of the site, and the machine's progress relative thereto, the operator can maneuver the machine over the site to perform various geography-altering operations without having to rely on physical markers placed over the surface of the site. And, as the operator moves the machine over the site the dynamic database 66 continues to read and manipulate incoming position information from module 50 to dynamically update both the machine's position relative to the site, the path of the machine over the site, and any change in actual site geography effected by the machine's passage.
This updated information is used to generate representations of the site and can be used to direct the operation of the machine in real time to bring the actual, updated site geography into conformity with the desired site model.
Field of the Invention This invention relates to the operation of machinery for altering the geography of a work site and, more particularly, to the real time generation and use of digital data which collectively represents the geography of the work site as it is being altered by the machinery toward a desired state.
As used in this patent specification the phrase "geography altering machinery" and various approximations thereof refer to self-propelled mobile machines such as track-type tractors, road graders, pavers and asphalt layers which exhibit both (l) mobility over or through a work site as a result of being provided with a prime mover (for example an engine) on a frame which drives wheels or tracks supporting the frame, and (2) the capacity to alter the geography of a work site as a consequence of the provision on the frame of a tool or tool set such as a blade, shovel, bucket, ripper or the like. Machinery such as track-type tractors, graders, pavers and asphalt layers is typically referred to as "earth moving machinery or equipment" and it is to be understood that these machines constitute a subcategory of the geography altering machinery with which this invention deals.
Backqround of the Invention Despite the development of sophisticated and powerful earthmoving machinery it remains a time consuming and labor intensive chore to recontour the 35 topography of a large plot of land, or to otherwise alter the geography of a work site such as a 2 ~ 2 9 6 PCT~S94/13143 construction area, mine, road or the like. Such operations sometimes involve the necessity of a survey which is currently carried out using line of sight optical instruments or other static, point-by-point measuring techniques to obtain the coordinates of a large number of points over the work site and to thereafter construct a three-dimensional model of the site. From the survey an architectural plan or target geography is developed. Thereafter the site is carefully marked with stakes of various colors to provide physical cues to the operator of geography altering machinery such as a track-type tractor as to how the machine should be operated to transform the work site from the original to the desired state.
Only the most skillful and experienced operators can achieve efficiency in recontouring a large land site, such difficulty being due in part to the absence of large scale as well as detailed information as to the progress being made in the revision of the site.
As a result most projects involving the alteration of the geography of large work sites are time consuming and labor intensive in the requirements for skilled personnel and large crews to direct the operation of earthmoving machinery and the like.
Additionally, for knowledge of the degree to which the original site geography has been brought into conformity with the desired geography, the operation is often interrupted while a survey crew verifies the amount of progress to date and manually updates the staking and marking o~ the site, as well as the site model. Between these occasional verifications the machinery operators and supervisors have no truly accurate way to measure their real time progress.
W09St16228 21 S 2 9 6 0 PCT~S94/13143 Summary Disclosure of the Invention The invention provides a solution to the long standing problems of operating machinery to accurately and efficiently alter the geography of a work site toward the desired condition. The subject invention achieves such geography alteration without the need for physical markers on the site to cue the operator, with only such interruptions in operation as are needed, for example, to refuel the machinery, and with a minimum need for crew.
In general this is accomplished through the provision of a digital data storage, retrieval and process facility which per se may be carried on the mobile machinery or located remotely from the machinery but connected, for example, by radio link to the machinery for storing, actually creating, and modifying a digital three-dimensional model of the site as it exists at any given time, as well as a digital model of the site as an architect, for example, wishes it to be.
The subject invention further comprises a mechanism by which the exact position in three-dimensional space of the mobile machine, or in certain cases the earth-contacting implement which is carried by the machine, can be accurately determined in real time; i.e., as it alters the geography of the site thereby to update the digital three-dimensional model, point by point and in real time as the machinery travels over or through it. As hereinafter described the preferred implementation of the invention involves the use of a phase differential GPS (global positioning system) receiver system which is capable of precisely locating an object in three-dimensional space to centimeter accuracy.
WO95/16228 2 1 5 2 9 6 0 PCT~S94/13143 The subject invention further comprises means for comparing the desired digital three-dimensional site model to the continuously updated actual digital three-dimensional site model and for generating signals representing the degree of alteration needed at each of a large number of coordinates over or through the work site to bring the actual model into conformity with the desired model.
These signals may in one instance provide real time displays on or off the machinery to cue the operator as to the machine's actual progress in real time and within a frame of reference which conveys information as to at least a substantial portion of the overall site. In another embodiment hereinafter described the signals representing the differences between the desired and actual three-dimensional models are applied to the real time automatic controls of the machine itself or a portion thereof or both.
In a preferred form at least a portion of the position-determining mechanism or system is carried on the machine itself as it traverses the site. Where the machine includes a separate earth-contacting implement, the position-determining system may be mounted on the implement itself. Where the implement is itself movable relative to the machine frame or carriage, for example a hydraulically-activated blade, bucket, or scraper, the implement can be provided with means to determine its elevation relative to the surface of the site.
According to another aspect of the invention a method is provided for directing the operations of a mobile geography-altering machine which comprises the steps of producing and storing in a digital data storage and retrieval means a first three-dimensional geographic site model representing the desired WO9S/16228 215 2 9 6 0 PCT~S94113143 geography of a site and a second three-dimensional geographic site model representing the actual geography of the site, thereafter generating digital signals representing in real time the instantaneous position in three-dimensional space of a mobile geography-altering machine or an implement carried thereby as it traverses and alters the site, utilizing the digital signals to update the second model, determining the difference between the first model and the updated second model and directing the operations of the machine in accordance with the difference to bring the updated second model into conformity with the first model.
In one embodiment the step of directing the operation of the machine is carried out by providing to a machine operator a display which informs the operator in real time of the instantaneous position of the mobile machine relative to the work site, the alterations which are needed to bring the site into conformity with the first three-dimensional model, and the actual progress being made toward the realization of the first model.
In another embodiment the step of directing the operations of the machine is carried out in an automatic or semi-automatic fashion by actually working through electrohydraulic actuators to control the position, elevation and direction of movement of the machine and/or the earth altering tool carried thereby.
In a preferred form at least a portion of the position-determining means is carried on the machine itself as it traverses the site. Where the machine includes a separate earth-contacting implement, the position-determining system may be mounted on the implement itself. Where the implement WO95/16228 PCT~S94/13143 is itself movable relative to the machine frame or carriage, the implement can be provided with means to determine its elevation relative to the surface of the site.
As hereinafter made more explicit, both the apparatus and the method aspects of the present invention can be achieved in various ways; for example, the digital data storage and retrieval facility as well as the updating and differencing means may be carried by and on the machine as part of an integral and comprehensive on-board machine system.
Alternately these means may be located at an off site or nearby facility for transmitting visual display signals or automatic control signals to the machine and for receiving updated position and site information from the machine during operation thereof.
As hereinafter described in detail the geography-altering machine may be earth-moving equipment such as a track-type tractor, grader, paver or asphalt layer. The machine may also be capable of underground or in ground operations such as the mobile machinery found in open pit or below ground mining operations, depending on the capabilities of the positioning system used.
In the preferred form the method and apparatus aspects of the invention are realized through the utilization of three-dimensional position information derived from global positioning satellites using a phase differential GPS receiver system. Such GPS receivers utilize signals from global positioning satellites as well as a differential signal from a local reference receiver of known position coordinates to generate position coordinate data to centimeter accuracy. Accordingly, the apparatus used to carry out the invention in the preferred form comprises a -WO95/16228 2 1 5 2 9 6 0 PCT~S94113143 GPS receiver havlng both GPS and local signal reception capabilities and, where a local reference signal at a geodetically surveyed site is not available, a temporary surveyed differential receiver/transmitter to provide the local data processing apparatus with a correction signal.
Alternately, raw position data can be transmitted from the reference receiver to the local data processor for comparison and correction with the information from the machine-mounted receiver.
According to another aspect of the invention means are provided for precisely generating and controlling displays which are suitable for use in performing operations to alter the geography of sites such as construction sites, mines, and roads so as to precisely display the progress being made by the mobile machine on an incremental basis wherein the display unit areas may or may not correspond to the sampling rate of the GPS receiver and digital processor system. As hereinafter described, the site, or a practically displayable portion thereof, is subdivided into a continuous matrix of unit areas of such size that the mobile machine may traverse these unit areas at a rate which is greater than the sampling rate of the GPS receiver and data processing facility. Algorithms are provided which take into account the physical parameters and dimensions of the earth-altering tool or implements and the relationship thereof to the physical machine and its path of travel. The unit areas of the display are filled in, colored, revised or otherwise altered in accordance with progress information derived from the GPS
receiver or other positioning system and the digital processing facility, in accordance with the WO95/16228 PCT~S94/13143 ~ 2ls29 6 0 hereinafter described laws of the algorithm which is in residence in the digital processing facility.
In one embodiment of the invention the real-time path of the machine relative to the site between position readings is determined with a differencing algorithm which determines an effective width of a geography-altering portion of the machine less than or equal to its actual width, and updates each portion of the site model which the effective width traverses.
In a preferred form, the instantaneous position of the machine as it traverses the site is tracked as a series of coordinate points on the site model. Where the rate at which the coordinate points are tracked is not synchronous with the rate of travel of the machine over the unit areas or grid elements of the site, the differencing algorithm determines the unit areas traversed by the geography-altering portion of the machine between coordinate points. Where the geography-altering portion is of a continuous width, for example a blade or scraper element, the effective parameters of the blade are preferably set less than its actual parameters to ensure that only those portions of the site actually operated on by the blade are filled in, colored, revised or otherwise altered or marked to reflect the alterations to the site and the current difference between the actual and desired site models.
As will be made more clear, an initial site survey may be created in a variety of ways so as to constitute the first three-dimensional geographic site model. In one embodiment or utilization of the invention the first model may be created using standard state-of-the-art site surveying methods and thereafter the data from such state-of-the-art survey digitized in accordance with the physical and data WO95/16228 215 2 9 6 0 PCT~S94/13143 processing requirements of the particular digitizing and data processing system used. Alternatively the actual site geography model may be created by traversing the site with the geography-altering machine itself or through the use of special machinery and/or vehicles which are suited to the conditions.
For example, a smooth, relatively refined topographical site may be traversed by a pickup truck whereas a less refined or more rugged site may require a special vehicle or even a receiver, digitizing and/or storage facility carried by a person who traverses the site on foot. In another alternative a particularly difficult site may be surveyed by air using stereo photography or holography equipment. In a still further alternative, underground geology may be surveyed by or through the making of numerous core samples at various locations and at various depths in constructing underground site model from such samples.
Brief Descri~tion of the Drawinqs FIGURE 1 is a schematic representation of a machinery position and control method according to the present invention;
FIGURE 2 is a schematic representation of an apparatus which can be used in connection with the receipt and processing of GPS signals to carry out the present invention;
FIGURE 3 is a detailed schematic representation of an embodiment of the system of Figure 2 using GPS positioning;
FIGURE 4 is a schematic representation of a work site, geography altering machine, and position and control system according to an illustrative earth contouring embodiment of the present invention;
WO95/16228 ~ PCT~S94tl3143 21~96 -10-FIGURE 4A shows an alternate arrangement of the machine-mounted positioning system of Figure 4;
FIGURES 5A-5B are graphic reproductions of exemplary digitized site models such as used with the present invention;
FIGURES 6A-6D are representative real-time operator displays generated according to the present invention for an earth contouring operation as in Figure 4;
FIGURES 7A-7D are flowchart representations of a dynamic site database according to the present invention; and FIGURE 8 is a schematic representation of the system of the present invention including a closed-loop automatic machine control system.
Description of the Invention Referring to Figure 1, the method of the present invention is shown schematically. Using a known three-dimensional positioning system with an external reference, for example 3-D laser, GPS, GPS/laser combinations or radar, machine or tool position coordinates are determined in block 100 as the machine moves over the site. These coordinates are instantaneously supplied as a series of discrete points to a differencing algorithm at 102. The differencing algorithm calculates the machine position and path in real time. Digitized models of the actual and desired site geographies are loaded or stored at block 104, an accessible digital storage and retrieval facility, for example a local digital computer. The differencing algorithm 102 retrieves, manipulates and updates the site models from 104 and generates at 106 a dynamic site database of the difference between the actual site and the desired site model, updating the ~ WO95/16228 2 1 5 2 9 6 ~ PCT~S94/13143 actual site model in real-time as new position information is received from block lO0. This dynamically updated site model is then made available to the operator in display step 108, providing real time position, direction and site geography/
topography updates in human readable form. Using the information from the display the operator can efficiently monitor and direct the manual control of the machine at lO9.
Additionally, or alternately, the dynamic update information can be provided to an automatic machine control system at llO, for example an electrohydraulic control system of the type developed by Caterpillar Inc. and used to operate the various pumps, valves, hydraulic cylinders, motor/steering mechanisms and other controls used in geography-altering machinery. The electrohydraulic controls can provide an operator assist to minimize machine work and limit the manual controls if the operator's proposed action would, for example, overload the machine. Alternately, the site update information from the dynamic database can be used to provide fully automatic machine/ tool control.
It will be clear from the foregoing that with the present method the initial, actual site geography/ topography model can be generated by the machine itself on previously unsurveyed terrain. By simply moving the machine over a proposed site in a regular pattern, the geography of the site can be determined relative to the desired architect's site model loaded at 104. After the machine has traversed the entire site to accurately determine its actual geography, the actual site model can then be monitored and updated in real time at 106 as the machine brings WO95/16228 21~ 2 9 6 ~ PCT~S94/13143 the actual geography into conformity with the desired site model.
Referring now to Figure 2, an apparatus which can be used in connection with the receipt and processing of GPS signals to carry out the present invention is shown in block diagram form comprising a GPS receiver apparatus 120 with a local reference antenna and a satellite antenna; a digital processor 124 employing a differencing algorithm, and connected to receive position signals from 120; a digital storage and retrieval facility 126 accessed and updated by processor 124, and an operator display and/or automatic machine controls at 128 receiving signals from processor 124.
GPS receiver system 120 includes a satellite antenna receiving signals from global positioning satellites, and a local reference antenna. The GPS
receiver system 120 uses position signals from the satellite antenna and differential correction signals from the local reference antenna to generate position coordinate data in three-dimensions to centimeter accuracy for moving objects. Alternatively, raw data from the reference antenna can be processed by the system to determine the differential correction.
This position information is supplied to digital processor 124 on a real-time basis as the coordinate sampling rate of the GPS receiver 120 permits. The digital storage facility 126 stores a first site model of the desired site geography, for example according to an architect's plan, and a second digitized site model of the actual site geography, for example as initially surveyed. The site model corresponding to the actual site geography can be accessed and updated in real time by digital processor WO95/16228 '' 2 ~ 5 2 9 6 0 PCTtUS94tl3143 124 as it receives new position information from GPS
receiver 120.
Digital processor 124 further generates signals representing the difference between the continuously-updated actual site model and the architect's plan. These signals are provided to the operator display and/or automatic machine controls at 128 to direct the operation of the machine over the site to bring the updated actual site model into conformity with the architect's plan. The operator display 128, for example, provides one or more visual representations of the difference between the actual, continuously-updated site model and the desired site model to guide the operator in running the machine for the necessary geography-altering operations.
Referring now to Figure 3, a more detailed schematic of a system according to Figure 2 is shown using kinematic GPS for position reference signals. A
base reference module 40 and a-position module 50 together determine the three-dimensional coordinates of the geography-altering machine relative to the site, while an update/control module 60 converts this position information into real time representations of the site which can be used to accurately monitor and control the machine.
Base reference module 40 includes a stationary GPS receiver 16; a computer 42 receiving input from receiver 16; reference receiver GPS
software 44, temporarily or permanently stored in the computer 42; a standard computer monitor screen 46;
and a digital transceiver-type radio 48 connected to the computer and capable of transmitting a digital data stream. In the illustrative embodiment base reference receiver 16 is a high accuracy kinematic GPS
receiver; computer 4,2 for example is a 486DX computer W095/16228 r 2~.s296a PCT/US94/13143 with a hard drive, 8 megabyte RAM, two serial communication ports, a printer port, an external monitor port, and an external keyboard port; monitor screen 46 is a passive matrix color LCD; and radio 48 is a commercially available digital data transceiver.
Position module 50 comprises a matching kinematic GPS receiver 18, a matching computer 52 receiving input from receiver 18, kinematic GPS
software 54 stored permanently or temporarily in computer 52, a standard computer monitor screen 56, and a matching transceiver-type digital radio 58 which receives signals from radio 48 in base reference module 40. In the illustrative embodiment position module 50 is located on the geography-altering machine to move with it over the work site.
Update/control module 60, also carried on board the machine in the illustrated embodiment, includes an additional computer 62, receiving input from position module 50; one or more digitized site models 64 digitally stored or loaded into the computer memory; a dynamic database update module 66, also stored or loaded into the memory of computer 62; and a color operator display screen 22 connected to the computer. Instead of, or in addition to, operator display 22, automatic machine controls 70 can be connected to the computer to receive signals which operate the machine in an autonomous or semi-autonomous manner in known fashion.
Although update/control module 60 is here shown mounted on the mobile machine, some or all portions may be stationed remotely. For example, computer 62, site model(s) 64, and dynamic database 66 could be connected by radio data link to position module 50 and operator display 22 or machine control interface 70. Position and site update information W09S/16228 PCT~S94/13143 can then be broadcast to and from the machine for display or use by operators or supervisors both on and off the machine.
Base reference station 40 is fixed at a point of known three-dimensional coordinates relative to the work site. Through receiver 16 base reference station 40 receives position information from a GPS
satellite constellation, using the reference GPS
software 44 to derive an instantaneous error quantity or correction factor in known manner. This correction factor is broadcast from base station 40 to position station 50 on the mobile machine via radio link 48,58.
Alternatively, raw position data can be transmitted from base station 40 to position station 50 via radio link 48,58, and processed by computer 52.
Machine-mounted receiver 18 receives position information from the satellite constellation, while the kinematic GPS software 54 combines the signal from receiver 18 and the correction factor from 20 base reference 40 to determine the position of receiver 18 and the machine relative to base reference 40 and the work site within a few centimeters. This position information is three-dimensional and is available on a point-by-point basis according to the 25 sampling rate of the GPS system.
Referring to update/control module 60, once the digitized plans or models of the site have been loaded into computer 62, dynamic database 66 generates signals representative of the difference between actual and desired site geography to display this difference graphically on operator display screen 22.
For example, profile and/or plan views of the actual and desired site models are combined on screen 22 and the elevational difference between their surfaces is indicated. Using the position information received WO95/16228 ~ ~S 2 9 6 0 PCT~S94/13143 from position module 50, the database 66 also generates a graphic icon of the machine superimposed on the actual site model on display 22 corresponding to the actual position and direction of the machine on the site.
Because the sampling rate of the position module 50 results in a time/distance delay between position coordinate points as the machine moves over the site, the dynamic database 66 of the present invention uses a differencing algorithm to determine and update in real-time the path of the machine.
With the knowledge of the machine's exact position relative to the site, a digitized view of the site, and the machine's progress relative thereto, the operator can maneuver the machine over the site to perform various geography-altering operations without having to rely on physical markers placed over the surface of the site. And, as the operator moves the machine over the site the dynamic database 66 continues to read and manipulate incoming position information from module 50 to dynamically update both the machine's position relative to the site, the path of the machine over the site, and any change in actual site geography effected by the machine's passage.
This updated information is used to generate representations of the site and can be used to direct the operation of the machine in real time to bring the actual, updated site geography into conformity with the desired site model.
3~
Industrial APplicability Referring to Figure 4, a geography altering machine lO is shown on location at a construction site 12. In the illustrative embodiment of Figure 4 machine lO is a track-type tractor which performs 2152~60 WO95/16228 PCT~S94/13143 earthmoving and contouring operations on the site. It - will become apparent, however, that the principles and applications of the present invention will lend - themselves to virtually any mobile tool or machine with the capacity to move over or through a work site and alter the geography of the site in some fashion.
Machine 10 is equipped in known fashion with available hydraulic or electrohydraulic tool controls as schematically shown at 24. In the tractor contouring embodiment of Figure 4 these controls operate, among other things, push arm 26, tip/pitch cylinders 28, and lift cylinders 30 to maneuver blade 32 in three dimensions for desired cut, fill and carry operations.
Machine 10 is equipped with a positioning system capable of determining the position of the machine and/or its site-altering tool 32 with a high degree of accuracy, in the embodiment of Figure 4 a phase differential GPS receiver 18 located on the machine at fixed, known coordinates relative to the site-contacting portions of the tracks. Machine-mounted receiver 18 receives position signals from a GPS constellation 14 and an error/correction signal from base reference 16 via radio link 48,58 as described in Figure 3. Machine-mounted receiver 18 uses both the satellite signals and the error/correction signal frcm base reference 16 to accurately determine its position in three-dimensional space. Alternatively, raw position data can be transmitted from base reference 16, and processed in known fashion by the machine-mounted receiver system to achieve the same result. Information on kinematic GPS and a system suitable for use with the present invention can be found, for example, in U.S. Patent ,No. 4,812,991 dated 14 March 1989 and U.S. Patent No.
WO95/16228 2 1 ~ 2 9 6 ~ PCT~S94/13143 4,963,889 dated 16 October 1990, both to Hatch. Using kinematic GPS or other suitable three-dimensional position signals from an external reference, the location of receiver 18 and machine 10 can be accurately determined on a point-by-point basis within a few centimeters as machine 10 moves over site 12.
The present sampling rate for coordinate points using the illustrative positioning system is approximately one point per second.
The coordinates of base receiver 16 can be determined in any known fashion, such as GPS
positioning or conventional surveying. Steps are also being taken in this and other countries to place GPS
references at fixed, nationally surveyed sites such as airports. If site 12 is within range (currently approximately 20 miles) of such a nationally surveyed site and local GPS receiver, that local receiver can be used as a base reference. Optionally, a portable receiver such as 16, having a tripod-mounted GPS
receiver, and a rebroadcast transmitter can be used.
The portable receiver 16 is surveyed in place at or near site 12 as previously discussed.
Also shown in schematic form on the tractor of Figure 4 is an on-board digital computer 20 including a dynamic database and a color graphic operator display 22. Computer 20 is connected to receiver 18 to continuously receive machine position information. Although it is not necessary to place computer 20, the dynamic database and the operator di~lay o~ tractor 10, this is currently a preferred embodiment and simplifies illustration.
Referring to Figures 5A-5B, site 12 has previously been surveyed to provide a detailed topographic blueprint (not shown) showing the architect's finished site plan overlaid on the ` 21S2960 -WO95/16228 PCT~S94/13143 original site topography in plan view. The creation of geographic or topographic blueprints of sites such as landfills, mines, and construction sites with - optical surveying and other techniques is a well-known art; reference points are plotted on a grid over the site, and then connected or filled in to produce the site contours on the blueprint. The greater the number of reference points taken, the greater the detail of the map.
10Systems and software are currently available to produce digitized, two- or three-dimensional maps of a geographic site. For example, the architect's blueprint can be converted into three-dimensional digitized models of the original site geography or topography as shown at 36 in Figure 5A and of the desired site model as shown at 38 in Figure 5B. The site contours can be overlaid with a reference grid of uniform grid elements 37 in known fashion. The digitized site plans can be superimposed, viewed in two or three dimensions from various angles (e.g., profile and plan), and color coded to designate areas in which the site needs to be machined, for example by removing earth, adding earth, or simply left alone.
Available software can also estimate the quantity of earth required to be machined or moved, make cost estimates and identify various site features and obstacles above or below ground.
However site 12 is surveyed, and whether the machine operators and their supervisors are working from a paper blueprint or a digitized site plan, the prior practice is to physically stake out the various contours or reference points of the site with marked instructions for the machine operators. Using the stakes and markings for reference, the operators must estimate by sight and feel where and how much to cut, WO95/16228 PCT~S94/13143 ~ 21~2960 -20-fill in, carry or otherwise contour or alter the original geography or topography to achieve the finished site plan. Periodically during this process the operator's progress is manually checked to coordinate the contouring operations in static, step-by-step fashion until the final contour is achieved.
This manual periodic updating and checking is labor-intensive, time consuming, and inherently provides less than ideal results.
Moreover, when it is desired to revise the blueprint or digitized site model as an indicator of progress to date and work to go, the site must again be statically surveyed and the blueprint or digitized site model manually corrected off-site in a non-real time manner.
To eliminate the drawbacks of prior art static surveying and updating methods, the present invention integrates accurate three-dimensional positioning and digitized site mapping with a dynamically updated database and operator display for real-time monitoring and control of the site 12 and machine 10. The dynamic site database determines the difference between the actual and desired site model geographies, receives kinematic GPS position information for machine 10 relative to site 12 from position receiver 18, displays both the site model and the current machine position to the operator on display 22, and updates the actual site model geography, machine position and display in real time with a degree of accuracy measured in centimeters.
The operator accordingly achieves unprecedented knowledge of and control over the earthmoving operations in real time, on-site, and can accordingly finish the job with virtually no interruption or need to check or re-survey the site.
WO95/16228 ~ 2 1 5 2 9 6 0 PCT~S94/13143 Referring now to Figures 6A-6D, a number of illustrative displays available to the machine operator on screen 22 are shown for the topographical contouring application of Figure 4. While the illustrated embodiment of Figures 6A-6D shows operator displays for earth contouring operations with a tractor-mounted blade, it will be apparent to those skilled in the art that relevant displays for virtually any type of earthmoving or geography altering operation and machine can be provided with the present invention.
Referring to Figures 6A and 6B a first embodiment of an operator display on screen 22 has as a principal component a three-dimensional digitized site model in plan window 70 showing the desired final contour or plan of site 12 (or a portion thereof) relative to the actual topography. On an actual screen display 70 the difference between the actual site topography and the desired site model are more readily apparent, since color coding or similar visual markers are used to show areas in which earth must be removed, areas in which earth must be added, and areas which have already achieved conformity with the finished site model.
In Figure 6B, operator display 22 is the same as that in Figure 6A, except that the site plan window 70 shows a two-dimensional plan view and the machine is in a different position relative to the site. The differently shaded or cross-hatched regions on the site displayed in window 70 graphically represent the varying differences between the actual site topography and desired site topography.
Operator display screen 22 includes a horizontal coordinate window or display 72 at the top of the screen, showing the operator's position in 2I52~c~
WO95tl6228 - PCT~S94/13143 three dimensions relative to base reference 16.
Coarse and fine resolution sidebar scales 74,75 show the elevational or z-axis deviation from the target contour elevation, providing an indicator of how much the tractor blade 32 should cut or fill at that location. The coarse indicator 74 on the right shows scaled elevation of l.0 foot increments above and below the target elevation; the fine resolution side bar 75 of the left side of the display lists O.l foot increments and provides a convenient reference when the operator is within a foot or less of the target contour. Using "zoom" or "autoscaling" features in the display software, the scales 74,75 can be changed to smaller increments as the operator nears the target topography.
The display increments and units of measurement used in the system and method of the present invention can be metric (meters, centimeters, etc.) or non-metric, as desired by the user.
A further reference is provided to the machine operator in profile window 76 at the bottom of screen 22. Profile window 76 shows the elevational difference between the actual site topography 76a and the desired topography 76b in the path of the machine and immediately behind the machine. An elevation scale 78 on the left side of profile display 76 can provide an additional indicator of how deep to make a cut or how much earth to add at a given location, while the horizontal scale 79 at the bottom of profile ~o display 76 indicates the distance ahead of the tractor/ blade at which the operator will encounter certain actual and desired topography differences. In this manner the operator can simultaneously monitor the upcoming terrain and the accuracy of the most ~ WO95/16228 2 1 S 2 9 6 0 PCT~S94/13143 recent pass in achieving the target contour, and - adjust operations accordingly.
The position of the tractor on site 12 is displayed graphically on screen 22 as a tractor blade icon 82 superimposed on the plan window 70, the profile window 76, and the appropriate sidebar scale 74,75. In the site plan window 70 icon 82 is provided with a forward-projecting direction indicator 84, which serves to identify the terrain a fixed distance ahead of the tractor in its direction of travel. The anticipated terrain shown in front of tractor icon 82 in profile window 76 corresponds to that portion of site 12 covered by direction indicator 84. In Figures 6A and 6B while icon 82 in windows 70,74,75 moves in response to the current position of the machine relative to the site, the icon 82 in profile window 76 remains centered while the site topography profiles 76a,76b scroll past it according to machine movement.
With the detailed position, direction and target contour information provided to the operator via display 22, centimeter-accurate control can be maintained over the earth moving operations. Also, the operator has a complete, up-to-date, real-time display of the entire site, progress to date, and success in achieving the desired topography. At the end of the day the digitized site model in the database has been completely updated, and can simply be stored for retrieval the following day to begin where the operator stopped, or off-loaded for further analysis.
Referring to Figures 6C and 6D, a slightly different operator display is provided, having a schematic plan window 88 of the site contours, a blade front profile window 89 with left and right blade edge elevation side bars 89a,89b to help align the blade WO95tl6228 1 5 2 9 6 0 ` ~ ` PCT~S94/13143 rotationally for an angled cut or a cut on angled terrain, and a profile window 76 on a larger scale and using a different tractor/blade icon 82. The display of Figure 6D is the same as that in Figure 6C, except that side profile view 76 has been rotated 90 for a different perspective on the tractor operation.
Figures 6C and 6D are shown primarily to illustrate the flexibility and applicability of the principles of the present invention for various geography altering applications.
In the illustrated embodiment of a tractor contouring application, the machine-mounted position receiver 18 is positioned on the cab of tractor 10 at a fixed, known distance from the bottom of the ground-engaging portion of the tractor tracks. Since thetracks are actually in contact with the site topography, receiver 18 is calibrated to take this elevational difference into account; in effect, the cab-mounted receiver 18 is perceived by the system as being level with the site topography over which the machine is operating.
While the use of a single position receiver 18 at a fixed distance from the machine's site-contacting carriage or tread is an effective and sturdy mounting arrangement, in certain applications it may be preferable to use different mounting arrangements for the positioning receiver. For example, the current direction of the tractor relative to the site plan, as shown on display 22 by icon 82 and direction indicator 84 in Figure 6A, may be of f by a slight time lag vector, depending on the sampling rate of the receiver 18 and the machine's rate of directional change. With only one position receiver 18 mounted on tractor 10, machine direction at a single point cannot be determined since the machine ~ WO95/l6~8 -25- PCT~S94/13143 effectively pivots around the single receiver. This problem is solved by placing a second position receiver on the machine, spaced from the first, for a directional reference point.
Additionally, the distance between the blade 32 and the rearwardly-mounted GPS receiver 18 in Figure 4 creates a slight real time delay in resolving the position of the blade as it performs the earth moving operations. In most cases this delay is negligible, since the GPS position follows close behind blade 32 and matches the just-made alterations to the site geography. On larger machines, however, it may be preferable to mount one or more position receivers 18a directly on the cutting blade as shown in Figure 4 in phantom. In this arrangement, because the blade moves up and down relative to the machine and the surface of the site, it is also desirable to provide an apparatus for measuring the distance between the bottom of the blade and the surface of the site. A suitable device, for example, is a sonic proximity detector mounted on the blade as schematically shown at 19 in Figure 4, connected to provide signals representing the height of blade 32 above the surface to computer 20 and the dynamic database. These and other suitable proximity detectors are commercially available. The dynamic database uses the signals from proximity detector 19 to compensate for variations in the relative position of a blade-mounted GPS receiver to the ground, and can also correct for blade wear, and blade lift caused when the tractor backs up.
Another consideration when mounting the position receiver equipment on machine 10 is whether the machine carries a tool which moves independently to perform the geography altering operations; tractor WO95/16228 ~ 1 5 2 9 6 0 PCT~S94/13143 10 with its controllably movable blade 32 is a good example. To improve the accuracy of monitoring and control over the geography altering operations of tool 32, the preferable mounting arrangement for the position receiver 18 in many cases may be directly on tool 32. In a machine contouring application the illustrative blade-mounted dual receiver arrangement of Figure 4A not only places receivers 18 directly over the point where alterations to the site are made, but the two receivers 18 provide directional reference for the machine when it changes direction, and position information for a left/right blade angle measurement such as shown at 89 in Figures 6C and 6D.
Referring to Figure 7A, the operational steps of the dynamic database 66 for the machine contouring operation are shown schematically. The system is started at 300 from the computer's operating system. The graphics for the display screens are initialized at 302. The initial site database (a digitized site plan) is read from a file in the program directory, and the site plan and actual and target topography are drawn on the display at step 304. The side bar grade indicators from display 22 are set up at step 306, and the various serial communication routines among modules 40,50,60 (Figure 3) are initialized at step 308. At step 310 the system checks for a user request to stop the system, for example at the end of the day, or for meal breaks or shift changes. The user request to terminate at step 310 can be entered with any known user-interface device, for example a computer keyboard or similar computer input device, communicating with computer 62.
The machine's three-dimensional position is next read at step 312 from the serial port connection between position module 50 and control/update module WO95/16228 215 2 9 6 0 PCT~S94/13143 60 in Figure 3. At step 314 the machine's GPS
position is converted to the coordinate system of the digitized site plans, and these coordinates are displayed in window 72 on screen 22 at step 316.
At step 318 the machine path is determined in both plan and profile views, and updated in real time to indicate the portions of the site plan grid over which the machine has operated. In the machine contouring embodiment, the width of the machine path is equated to its geography-altering tool (tractor blade 32) as it passes over the site. An accurate determination of the grid squares over which blade 32 passes is necessary to provide real time updates of the operator's position and work on the dynamic site plan. The size of the grid elements on the digitized site plan is fixed, and although the width of several grid elements can be matched evenly to the width of the machine ~i.e., the tractor blade), the blade will not always completely cover a particular grid element as the machine passes by. Even if the machine/tool width is an exact multiple of grid element width, it is rare that the machine would travel in a direction aligned with the grid elements so as to completely cover every element in its path.
To remedy this problem, in Figures 7B-7C a subroutine for step 318 determines the path of the operative portion of the machine (here the tractor blade 32) relative to the site plan grid. At step 319 in Figure 7B the module determines whether the m~chine-mounted receiver position has changed latitudinally or longitudinally (in the x or y directions in an [x, y, z] coordinate system) relative to the site. If yes, the system at step 320 determines whether this is the first system loop. If the present loop is not the first loop, the machine WO95/16228 - ` PCT~S94/13143 21~296D
path determined and displayed from the previous loops is erased at step 322 for updating in the present loop. If the present loop is the first loop, step 322 is simply bypassed, as there is no machine path history to erase.
At step 324 the tractor icon is initially drawn. If already drawn, the tractor icon is erased from its previous position on the site model plan at step 326. At step 328 the system determines whether the machine's current position coordinates are outside the grid element the machine occupied in the last system loop.
If at step 328 the position of the machine has not changed, for example if the dozer is parked or idling, the system proceeds to steps 336-344.
If at step 328 the position of the machine relative to the site plan grid has changed, the system proceeds to step 330 where it designates "effective"
tractor blade ends inboard from the actual blade ends.
In the illustrated embodiment the effective blade ends are recognized by the differencing algorithm as inboard from the actual ends a distance approximately one half the width of a grid element. For example, if the actual dozer blade 32 is lO.0 feet long, corresponding to five 2.0 ft. x 2.0 ft grid elements, the effective locations of the blade ends are calculated at step 330 one foot inboard from each actual end. If the effective (non-actual) blade ends contact or pass over any portion of a grid element on the digitized ~ite model, that grid element is read and manipulated by the differencing algorithm as having been altered by the machine, since in actuality at least one half of that grid element was actually passed over by the blade. Of course, the amount of blade end offset can vary depending on the size of the WO95/16228 21 a 2 9 6 0 PCT~S94/13143 grid elements and the desired margin of error in determining whether the blade has passed over a grid element. For example, it is possible to set the - effective tool parameters equal to the actual tool parameters, although the smaller effective parameters of the illustrated embodiment are preferred.
It will be understood that this blade-locating method is applicable to any geography altering operation in which it is desired to determine the path of a continuous portion of the machine or its tool traversing the grid elements of the site model.
At step 332 the system determines whether the blade has moved since the last system loop. If the blade has moved, the system proceeds to step 334 to determine the real-time path of the blade over the site plan grid in a manner described in further detail below with reference to Figure 7D. If at step 332 the blade has not moved since the last system loop, the system bypasses step 334. At step 336 the system uses the above-determined machine path information to calculate the machine icon position and orientation.
At step 338 this information is used to determine the current or actual site geography and the desired site geography profiles. At step 340 these profiles are displayed on operator display 22 in profile window 76.
At step 342 the system next draws the machine icon on the plan window 70, and at step 344 the machine path history previously erased is redrawn to reflect the most recent machine movement and site alterations in the path of the machine.
Referring back to step 319 of the subroutine for step 318, if there has been no significant change in the machine's position since the last measurement, the machine position, tracking and updating steps 320-2152960`
WO9S/16228 PCT~S94/13143 344 are bypassed, and the system proceeds from the subroutine of step 318 in Figure 7A to step 346.
At steps 346, 348 in Figure 7A, the coarse and fine grade indicators on the display are updated, and the system completes its loop and returns to step 310.
At step 310 the option is available to the operator to stop the system as described above, for example at the end of the day or at lunchtime. If the operator chooses at step 310 to stop the system, the system proceeds to step 350 where the current database is stored in a file on a suitable digital storage medium in the system computer, for example, a permanent or removable disk. At step 352 the operations of the differencing module are terminated, and at step 354 the operator is returned to the computer operating system. If the operator does not quit the system, it returns to step 312 where subsequent position readings are taken from the serial port connected to position module 50 and receiver 18, and the system loop repeats itself.
The subroutine for step 334 in Figure 7C
which updates the machine path and current site plan is shown in further detail in Figure 7D. While the algorithm of step 330 compensates for the lack of complete correspondence between the width of the machine or tool and the number of grid elements completely traversed by the machine or tool, the distance and direction changes which the machine/tool makes between GPS position readings results in a loss of real time update information over a portion of the machine's travel. This is particularly acute where machine travel speed is high relative to the grid elements of the site plan. For example, where the grid elements are one meter square and the sampling ~ WO95/16228 2 1 5 2 9 6 0 PCT~S94/13143 rate of the position system is one coordinate sample per second, a machine traveling at 18 kilometers per hour travels approximately five meters or five grid squares between position samplings. Accordingly, there is no real time information with respect to at least the intermediate three of the five grid squares covered by the machine.
To solve this problem a "fill in the polygon" algorithm is used in step 334 to estimate the path traversed by the machine between coordinate samplings. In Figure 7D the algorithm at step 334a locates a rectangle on the site plan grid surface defined by the effective ends of the dozer blade at positions (x1, Y1) and (x2, Y2) and coordinate position (x0, y0). At steps 334b, 334c and 334f a search algorithm searches within the rectangle's borders for those grid elements within a polygon defined between the two blade positions; i.e., those grid elements traversed by the blade between its effective ends.
At steps 334d and 334e these recently-traversed grid elements are "painted", shaded, marked or otherwise updated to inform the operator whether he is above, below or on the target elevation for those grid elements. In step 334d the ground elevation or z-axis coordinate of the grid elements is updated at coordinate (x2, Y2). In step 334e a current elevation greater than the target elevation results in the grid elements being, for example, colored red. A current elevation equal to the target elevation results in the grid elements being, for example, colored yellow. A
current elevation less than the target elevation results in the grid elements being, for example, colored blue. On the operator display 22 the update appears as the just-traversed swath of grid elements behind the machine/ tool icon 82, colored or otherwise WO95/16228 PCT~S94/13143 21529~0 visually updated to indicate whether the cut or contour is at, above or below the target contour; an example is shown by the differently-shaded regions of plan window 70 in Figure 6B. If the target contour has not been matched in that region, the operator can backtrack or correct it on the next pass. The painted swath traversed by the dozer icon will remain on the operator display screen 22 until it is altered sufficiently in subsequent passes to warrant a color change or similar visual update, e.g., until the elevation coordinates of the machine on the actual site come into closer conformity with the elevation coordinates for the desired site model on those grid elements.
While the system and method of the illustrated embodiment of Figures 7A-7D are directed to providing real time machine position and site update information via a visual operator display, it will be understood by those skilled in the art that the signals generated which represent the machine position and site update information can be used in a non-visual manner to operate known automatic machine controls, for example electrohydraulic machine and/or tool control system.
Referring now to Figure 8, a system according to the present invention is schematically shown for closed-loop automatic control of one or more machine or tool operating systems. While the embodiment of Figure 8 is capable of use with or without a suppleme~tal operator display as described above, for purposes of this illustration only automatic machine controls are shown. A suitable digital processing facility, for example a computer as described in the foregoing embodiments, containing the algorithms of the dynamic database of the invention is WO95/16228 2 1 5 2 9 PCT~S94/13143 shown at 400. The dynamic database 400 receives 3-D
instantaneous position information from GPS receiver system 410. The desired digitized site model 420 is loaded or stored in the database of computer 400 in any suitable manner, for example on a suitable disk memory. Automatic machine control module 470 contains electrohydraulic machine controls 472 connected to operate, for example, steering, tool and drive systems 474,476,478 on the geography-altering machine.
Automatic machine controls 472 are capable of receiving signals from the dynamic database in computer 400 representing the difference between the actual site model 430 and the desired site model 420 to operate the steering, tool and drive systems of the machine to bring the actual site model into conformity with the desired site model. As the automatic machine controls 472 operate the various steering, tool and drive systems of the machine, the alterations made to the site and the current position and direction of the machine are received, read and manipulated by the dynamic database at 400 to update the actual site model. The actual site update information is received by database 400, which correspondingly updates the signals delivered to machine controls 472 for operation of the steering, tool and drive systems of the machine as it progresses over the site to bring the actual site model into conformity with the desired site model.
It will be apparent to those skilled in the ~0 art that the inventi~e method and system can be easily applied to almost any geography altering, machining or surveying operation in which a machine travels over or through a work site to monitor or effect some change to the site geography in real-time. The illustrated embodiments provide an understanding of the broad W095/16228 PCT~S94/13143 principles of the invention, and disclose in detail a preferred application, and are not intended to be limiting. Many other modifications or applications of the invention can be made and still lie within the scope of the appended claims.
Industrial APplicability Referring to Figure 4, a geography altering machine lO is shown on location at a construction site 12. In the illustrative embodiment of Figure 4 machine lO is a track-type tractor which performs 2152~60 WO95/16228 PCT~S94/13143 earthmoving and contouring operations on the site. It - will become apparent, however, that the principles and applications of the present invention will lend - themselves to virtually any mobile tool or machine with the capacity to move over or through a work site and alter the geography of the site in some fashion.
Machine 10 is equipped in known fashion with available hydraulic or electrohydraulic tool controls as schematically shown at 24. In the tractor contouring embodiment of Figure 4 these controls operate, among other things, push arm 26, tip/pitch cylinders 28, and lift cylinders 30 to maneuver blade 32 in three dimensions for desired cut, fill and carry operations.
Machine 10 is equipped with a positioning system capable of determining the position of the machine and/or its site-altering tool 32 with a high degree of accuracy, in the embodiment of Figure 4 a phase differential GPS receiver 18 located on the machine at fixed, known coordinates relative to the site-contacting portions of the tracks. Machine-mounted receiver 18 receives position signals from a GPS constellation 14 and an error/correction signal from base reference 16 via radio link 48,58 as described in Figure 3. Machine-mounted receiver 18 uses both the satellite signals and the error/correction signal frcm base reference 16 to accurately determine its position in three-dimensional space. Alternatively, raw position data can be transmitted from base reference 16, and processed in known fashion by the machine-mounted receiver system to achieve the same result. Information on kinematic GPS and a system suitable for use with the present invention can be found, for example, in U.S. Patent ,No. 4,812,991 dated 14 March 1989 and U.S. Patent No.
WO95/16228 2 1 ~ 2 9 6 ~ PCT~S94/13143 4,963,889 dated 16 October 1990, both to Hatch. Using kinematic GPS or other suitable three-dimensional position signals from an external reference, the location of receiver 18 and machine 10 can be accurately determined on a point-by-point basis within a few centimeters as machine 10 moves over site 12.
The present sampling rate for coordinate points using the illustrative positioning system is approximately one point per second.
The coordinates of base receiver 16 can be determined in any known fashion, such as GPS
positioning or conventional surveying. Steps are also being taken in this and other countries to place GPS
references at fixed, nationally surveyed sites such as airports. If site 12 is within range (currently approximately 20 miles) of such a nationally surveyed site and local GPS receiver, that local receiver can be used as a base reference. Optionally, a portable receiver such as 16, having a tripod-mounted GPS
receiver, and a rebroadcast transmitter can be used.
The portable receiver 16 is surveyed in place at or near site 12 as previously discussed.
Also shown in schematic form on the tractor of Figure 4 is an on-board digital computer 20 including a dynamic database and a color graphic operator display 22. Computer 20 is connected to receiver 18 to continuously receive machine position information. Although it is not necessary to place computer 20, the dynamic database and the operator di~lay o~ tractor 10, this is currently a preferred embodiment and simplifies illustration.
Referring to Figures 5A-5B, site 12 has previously been surveyed to provide a detailed topographic blueprint (not shown) showing the architect's finished site plan overlaid on the ` 21S2960 -WO95/16228 PCT~S94/13143 original site topography in plan view. The creation of geographic or topographic blueprints of sites such as landfills, mines, and construction sites with - optical surveying and other techniques is a well-known art; reference points are plotted on a grid over the site, and then connected or filled in to produce the site contours on the blueprint. The greater the number of reference points taken, the greater the detail of the map.
10Systems and software are currently available to produce digitized, two- or three-dimensional maps of a geographic site. For example, the architect's blueprint can be converted into three-dimensional digitized models of the original site geography or topography as shown at 36 in Figure 5A and of the desired site model as shown at 38 in Figure 5B. The site contours can be overlaid with a reference grid of uniform grid elements 37 in known fashion. The digitized site plans can be superimposed, viewed in two or three dimensions from various angles (e.g., profile and plan), and color coded to designate areas in which the site needs to be machined, for example by removing earth, adding earth, or simply left alone.
Available software can also estimate the quantity of earth required to be machined or moved, make cost estimates and identify various site features and obstacles above or below ground.
However site 12 is surveyed, and whether the machine operators and their supervisors are working from a paper blueprint or a digitized site plan, the prior practice is to physically stake out the various contours or reference points of the site with marked instructions for the machine operators. Using the stakes and markings for reference, the operators must estimate by sight and feel where and how much to cut, WO95/16228 PCT~S94/13143 ~ 21~2960 -20-fill in, carry or otherwise contour or alter the original geography or topography to achieve the finished site plan. Periodically during this process the operator's progress is manually checked to coordinate the contouring operations in static, step-by-step fashion until the final contour is achieved.
This manual periodic updating and checking is labor-intensive, time consuming, and inherently provides less than ideal results.
Moreover, when it is desired to revise the blueprint or digitized site model as an indicator of progress to date and work to go, the site must again be statically surveyed and the blueprint or digitized site model manually corrected off-site in a non-real time manner.
To eliminate the drawbacks of prior art static surveying and updating methods, the present invention integrates accurate three-dimensional positioning and digitized site mapping with a dynamically updated database and operator display for real-time monitoring and control of the site 12 and machine 10. The dynamic site database determines the difference between the actual and desired site model geographies, receives kinematic GPS position information for machine 10 relative to site 12 from position receiver 18, displays both the site model and the current machine position to the operator on display 22, and updates the actual site model geography, machine position and display in real time with a degree of accuracy measured in centimeters.
The operator accordingly achieves unprecedented knowledge of and control over the earthmoving operations in real time, on-site, and can accordingly finish the job with virtually no interruption or need to check or re-survey the site.
WO95/16228 ~ 2 1 5 2 9 6 0 PCT~S94/13143 Referring now to Figures 6A-6D, a number of illustrative displays available to the machine operator on screen 22 are shown for the topographical contouring application of Figure 4. While the illustrated embodiment of Figures 6A-6D shows operator displays for earth contouring operations with a tractor-mounted blade, it will be apparent to those skilled in the art that relevant displays for virtually any type of earthmoving or geography altering operation and machine can be provided with the present invention.
Referring to Figures 6A and 6B a first embodiment of an operator display on screen 22 has as a principal component a three-dimensional digitized site model in plan window 70 showing the desired final contour or plan of site 12 (or a portion thereof) relative to the actual topography. On an actual screen display 70 the difference between the actual site topography and the desired site model are more readily apparent, since color coding or similar visual markers are used to show areas in which earth must be removed, areas in which earth must be added, and areas which have already achieved conformity with the finished site model.
In Figure 6B, operator display 22 is the same as that in Figure 6A, except that the site plan window 70 shows a two-dimensional plan view and the machine is in a different position relative to the site. The differently shaded or cross-hatched regions on the site displayed in window 70 graphically represent the varying differences between the actual site topography and desired site topography.
Operator display screen 22 includes a horizontal coordinate window or display 72 at the top of the screen, showing the operator's position in 2I52~c~
WO95tl6228 - PCT~S94/13143 three dimensions relative to base reference 16.
Coarse and fine resolution sidebar scales 74,75 show the elevational or z-axis deviation from the target contour elevation, providing an indicator of how much the tractor blade 32 should cut or fill at that location. The coarse indicator 74 on the right shows scaled elevation of l.0 foot increments above and below the target elevation; the fine resolution side bar 75 of the left side of the display lists O.l foot increments and provides a convenient reference when the operator is within a foot or less of the target contour. Using "zoom" or "autoscaling" features in the display software, the scales 74,75 can be changed to smaller increments as the operator nears the target topography.
The display increments and units of measurement used in the system and method of the present invention can be metric (meters, centimeters, etc.) or non-metric, as desired by the user.
A further reference is provided to the machine operator in profile window 76 at the bottom of screen 22. Profile window 76 shows the elevational difference between the actual site topography 76a and the desired topography 76b in the path of the machine and immediately behind the machine. An elevation scale 78 on the left side of profile display 76 can provide an additional indicator of how deep to make a cut or how much earth to add at a given location, while the horizontal scale 79 at the bottom of profile ~o display 76 indicates the distance ahead of the tractor/ blade at which the operator will encounter certain actual and desired topography differences. In this manner the operator can simultaneously monitor the upcoming terrain and the accuracy of the most ~ WO95/16228 2 1 S 2 9 6 0 PCT~S94/13143 recent pass in achieving the target contour, and - adjust operations accordingly.
The position of the tractor on site 12 is displayed graphically on screen 22 as a tractor blade icon 82 superimposed on the plan window 70, the profile window 76, and the appropriate sidebar scale 74,75. In the site plan window 70 icon 82 is provided with a forward-projecting direction indicator 84, which serves to identify the terrain a fixed distance ahead of the tractor in its direction of travel. The anticipated terrain shown in front of tractor icon 82 in profile window 76 corresponds to that portion of site 12 covered by direction indicator 84. In Figures 6A and 6B while icon 82 in windows 70,74,75 moves in response to the current position of the machine relative to the site, the icon 82 in profile window 76 remains centered while the site topography profiles 76a,76b scroll past it according to machine movement.
With the detailed position, direction and target contour information provided to the operator via display 22, centimeter-accurate control can be maintained over the earth moving operations. Also, the operator has a complete, up-to-date, real-time display of the entire site, progress to date, and success in achieving the desired topography. At the end of the day the digitized site model in the database has been completely updated, and can simply be stored for retrieval the following day to begin where the operator stopped, or off-loaded for further analysis.
Referring to Figures 6C and 6D, a slightly different operator display is provided, having a schematic plan window 88 of the site contours, a blade front profile window 89 with left and right blade edge elevation side bars 89a,89b to help align the blade WO95tl6228 1 5 2 9 6 0 ` ~ ` PCT~S94/13143 rotationally for an angled cut or a cut on angled terrain, and a profile window 76 on a larger scale and using a different tractor/blade icon 82. The display of Figure 6D is the same as that in Figure 6C, except that side profile view 76 has been rotated 90 for a different perspective on the tractor operation.
Figures 6C and 6D are shown primarily to illustrate the flexibility and applicability of the principles of the present invention for various geography altering applications.
In the illustrated embodiment of a tractor contouring application, the machine-mounted position receiver 18 is positioned on the cab of tractor 10 at a fixed, known distance from the bottom of the ground-engaging portion of the tractor tracks. Since thetracks are actually in contact with the site topography, receiver 18 is calibrated to take this elevational difference into account; in effect, the cab-mounted receiver 18 is perceived by the system as being level with the site topography over which the machine is operating.
While the use of a single position receiver 18 at a fixed distance from the machine's site-contacting carriage or tread is an effective and sturdy mounting arrangement, in certain applications it may be preferable to use different mounting arrangements for the positioning receiver. For example, the current direction of the tractor relative to the site plan, as shown on display 22 by icon 82 and direction indicator 84 in Figure 6A, may be of f by a slight time lag vector, depending on the sampling rate of the receiver 18 and the machine's rate of directional change. With only one position receiver 18 mounted on tractor 10, machine direction at a single point cannot be determined since the machine ~ WO95/l6~8 -25- PCT~S94/13143 effectively pivots around the single receiver. This problem is solved by placing a second position receiver on the machine, spaced from the first, for a directional reference point.
Additionally, the distance between the blade 32 and the rearwardly-mounted GPS receiver 18 in Figure 4 creates a slight real time delay in resolving the position of the blade as it performs the earth moving operations. In most cases this delay is negligible, since the GPS position follows close behind blade 32 and matches the just-made alterations to the site geography. On larger machines, however, it may be preferable to mount one or more position receivers 18a directly on the cutting blade as shown in Figure 4 in phantom. In this arrangement, because the blade moves up and down relative to the machine and the surface of the site, it is also desirable to provide an apparatus for measuring the distance between the bottom of the blade and the surface of the site. A suitable device, for example, is a sonic proximity detector mounted on the blade as schematically shown at 19 in Figure 4, connected to provide signals representing the height of blade 32 above the surface to computer 20 and the dynamic database. These and other suitable proximity detectors are commercially available. The dynamic database uses the signals from proximity detector 19 to compensate for variations in the relative position of a blade-mounted GPS receiver to the ground, and can also correct for blade wear, and blade lift caused when the tractor backs up.
Another consideration when mounting the position receiver equipment on machine 10 is whether the machine carries a tool which moves independently to perform the geography altering operations; tractor WO95/16228 ~ 1 5 2 9 6 0 PCT~S94/13143 10 with its controllably movable blade 32 is a good example. To improve the accuracy of monitoring and control over the geography altering operations of tool 32, the preferable mounting arrangement for the position receiver 18 in many cases may be directly on tool 32. In a machine contouring application the illustrative blade-mounted dual receiver arrangement of Figure 4A not only places receivers 18 directly over the point where alterations to the site are made, but the two receivers 18 provide directional reference for the machine when it changes direction, and position information for a left/right blade angle measurement such as shown at 89 in Figures 6C and 6D.
Referring to Figure 7A, the operational steps of the dynamic database 66 for the machine contouring operation are shown schematically. The system is started at 300 from the computer's operating system. The graphics for the display screens are initialized at 302. The initial site database (a digitized site plan) is read from a file in the program directory, and the site plan and actual and target topography are drawn on the display at step 304. The side bar grade indicators from display 22 are set up at step 306, and the various serial communication routines among modules 40,50,60 (Figure 3) are initialized at step 308. At step 310 the system checks for a user request to stop the system, for example at the end of the day, or for meal breaks or shift changes. The user request to terminate at step 310 can be entered with any known user-interface device, for example a computer keyboard or similar computer input device, communicating with computer 62.
The machine's three-dimensional position is next read at step 312 from the serial port connection between position module 50 and control/update module WO95/16228 215 2 9 6 0 PCT~S94/13143 60 in Figure 3. At step 314 the machine's GPS
position is converted to the coordinate system of the digitized site plans, and these coordinates are displayed in window 72 on screen 22 at step 316.
At step 318 the machine path is determined in both plan and profile views, and updated in real time to indicate the portions of the site plan grid over which the machine has operated. In the machine contouring embodiment, the width of the machine path is equated to its geography-altering tool (tractor blade 32) as it passes over the site. An accurate determination of the grid squares over which blade 32 passes is necessary to provide real time updates of the operator's position and work on the dynamic site plan. The size of the grid elements on the digitized site plan is fixed, and although the width of several grid elements can be matched evenly to the width of the machine ~i.e., the tractor blade), the blade will not always completely cover a particular grid element as the machine passes by. Even if the machine/tool width is an exact multiple of grid element width, it is rare that the machine would travel in a direction aligned with the grid elements so as to completely cover every element in its path.
To remedy this problem, in Figures 7B-7C a subroutine for step 318 determines the path of the operative portion of the machine (here the tractor blade 32) relative to the site plan grid. At step 319 in Figure 7B the module determines whether the m~chine-mounted receiver position has changed latitudinally or longitudinally (in the x or y directions in an [x, y, z] coordinate system) relative to the site. If yes, the system at step 320 determines whether this is the first system loop. If the present loop is not the first loop, the machine WO95/16228 - ` PCT~S94/13143 21~296D
path determined and displayed from the previous loops is erased at step 322 for updating in the present loop. If the present loop is the first loop, step 322 is simply bypassed, as there is no machine path history to erase.
At step 324 the tractor icon is initially drawn. If already drawn, the tractor icon is erased from its previous position on the site model plan at step 326. At step 328 the system determines whether the machine's current position coordinates are outside the grid element the machine occupied in the last system loop.
If at step 328 the position of the machine has not changed, for example if the dozer is parked or idling, the system proceeds to steps 336-344.
If at step 328 the position of the machine relative to the site plan grid has changed, the system proceeds to step 330 where it designates "effective"
tractor blade ends inboard from the actual blade ends.
In the illustrated embodiment the effective blade ends are recognized by the differencing algorithm as inboard from the actual ends a distance approximately one half the width of a grid element. For example, if the actual dozer blade 32 is lO.0 feet long, corresponding to five 2.0 ft. x 2.0 ft grid elements, the effective locations of the blade ends are calculated at step 330 one foot inboard from each actual end. If the effective (non-actual) blade ends contact or pass over any portion of a grid element on the digitized ~ite model, that grid element is read and manipulated by the differencing algorithm as having been altered by the machine, since in actuality at least one half of that grid element was actually passed over by the blade. Of course, the amount of blade end offset can vary depending on the size of the WO95/16228 21 a 2 9 6 0 PCT~S94/13143 grid elements and the desired margin of error in determining whether the blade has passed over a grid element. For example, it is possible to set the - effective tool parameters equal to the actual tool parameters, although the smaller effective parameters of the illustrated embodiment are preferred.
It will be understood that this blade-locating method is applicable to any geography altering operation in which it is desired to determine the path of a continuous portion of the machine or its tool traversing the grid elements of the site model.
At step 332 the system determines whether the blade has moved since the last system loop. If the blade has moved, the system proceeds to step 334 to determine the real-time path of the blade over the site plan grid in a manner described in further detail below with reference to Figure 7D. If at step 332 the blade has not moved since the last system loop, the system bypasses step 334. At step 336 the system uses the above-determined machine path information to calculate the machine icon position and orientation.
At step 338 this information is used to determine the current or actual site geography and the desired site geography profiles. At step 340 these profiles are displayed on operator display 22 in profile window 76.
At step 342 the system next draws the machine icon on the plan window 70, and at step 344 the machine path history previously erased is redrawn to reflect the most recent machine movement and site alterations in the path of the machine.
Referring back to step 319 of the subroutine for step 318, if there has been no significant change in the machine's position since the last measurement, the machine position, tracking and updating steps 320-2152960`
WO9S/16228 PCT~S94/13143 344 are bypassed, and the system proceeds from the subroutine of step 318 in Figure 7A to step 346.
At steps 346, 348 in Figure 7A, the coarse and fine grade indicators on the display are updated, and the system completes its loop and returns to step 310.
At step 310 the option is available to the operator to stop the system as described above, for example at the end of the day or at lunchtime. If the operator chooses at step 310 to stop the system, the system proceeds to step 350 where the current database is stored in a file on a suitable digital storage medium in the system computer, for example, a permanent or removable disk. At step 352 the operations of the differencing module are terminated, and at step 354 the operator is returned to the computer operating system. If the operator does not quit the system, it returns to step 312 where subsequent position readings are taken from the serial port connected to position module 50 and receiver 18, and the system loop repeats itself.
The subroutine for step 334 in Figure 7C
which updates the machine path and current site plan is shown in further detail in Figure 7D. While the algorithm of step 330 compensates for the lack of complete correspondence between the width of the machine or tool and the number of grid elements completely traversed by the machine or tool, the distance and direction changes which the machine/tool makes between GPS position readings results in a loss of real time update information over a portion of the machine's travel. This is particularly acute where machine travel speed is high relative to the grid elements of the site plan. For example, where the grid elements are one meter square and the sampling ~ WO95/16228 2 1 5 2 9 6 0 PCT~S94/13143 rate of the position system is one coordinate sample per second, a machine traveling at 18 kilometers per hour travels approximately five meters or five grid squares between position samplings. Accordingly, there is no real time information with respect to at least the intermediate three of the five grid squares covered by the machine.
To solve this problem a "fill in the polygon" algorithm is used in step 334 to estimate the path traversed by the machine between coordinate samplings. In Figure 7D the algorithm at step 334a locates a rectangle on the site plan grid surface defined by the effective ends of the dozer blade at positions (x1, Y1) and (x2, Y2) and coordinate position (x0, y0). At steps 334b, 334c and 334f a search algorithm searches within the rectangle's borders for those grid elements within a polygon defined between the two blade positions; i.e., those grid elements traversed by the blade between its effective ends.
At steps 334d and 334e these recently-traversed grid elements are "painted", shaded, marked or otherwise updated to inform the operator whether he is above, below or on the target elevation for those grid elements. In step 334d the ground elevation or z-axis coordinate of the grid elements is updated at coordinate (x2, Y2). In step 334e a current elevation greater than the target elevation results in the grid elements being, for example, colored red. A current elevation equal to the target elevation results in the grid elements being, for example, colored yellow. A
current elevation less than the target elevation results in the grid elements being, for example, colored blue. On the operator display 22 the update appears as the just-traversed swath of grid elements behind the machine/ tool icon 82, colored or otherwise WO95/16228 PCT~S94/13143 21529~0 visually updated to indicate whether the cut or contour is at, above or below the target contour; an example is shown by the differently-shaded regions of plan window 70 in Figure 6B. If the target contour has not been matched in that region, the operator can backtrack or correct it on the next pass. The painted swath traversed by the dozer icon will remain on the operator display screen 22 until it is altered sufficiently in subsequent passes to warrant a color change or similar visual update, e.g., until the elevation coordinates of the machine on the actual site come into closer conformity with the elevation coordinates for the desired site model on those grid elements.
While the system and method of the illustrated embodiment of Figures 7A-7D are directed to providing real time machine position and site update information via a visual operator display, it will be understood by those skilled in the art that the signals generated which represent the machine position and site update information can be used in a non-visual manner to operate known automatic machine controls, for example electrohydraulic machine and/or tool control system.
Referring now to Figure 8, a system according to the present invention is schematically shown for closed-loop automatic control of one or more machine or tool operating systems. While the embodiment of Figure 8 is capable of use with or without a suppleme~tal operator display as described above, for purposes of this illustration only automatic machine controls are shown. A suitable digital processing facility, for example a computer as described in the foregoing embodiments, containing the algorithms of the dynamic database of the invention is WO95/16228 2 1 5 2 9 PCT~S94/13143 shown at 400. The dynamic database 400 receives 3-D
instantaneous position information from GPS receiver system 410. The desired digitized site model 420 is loaded or stored in the database of computer 400 in any suitable manner, for example on a suitable disk memory. Automatic machine control module 470 contains electrohydraulic machine controls 472 connected to operate, for example, steering, tool and drive systems 474,476,478 on the geography-altering machine.
Automatic machine controls 472 are capable of receiving signals from the dynamic database in computer 400 representing the difference between the actual site model 430 and the desired site model 420 to operate the steering, tool and drive systems of the machine to bring the actual site model into conformity with the desired site model. As the automatic machine controls 472 operate the various steering, tool and drive systems of the machine, the alterations made to the site and the current position and direction of the machine are received, read and manipulated by the dynamic database at 400 to update the actual site model. The actual site update information is received by database 400, which correspondingly updates the signals delivered to machine controls 472 for operation of the steering, tool and drive systems of the machine as it progresses over the site to bring the actual site model into conformity with the desired site model.
It will be apparent to those skilled in the ~0 art that the inventi~e method and system can be easily applied to almost any geography altering, machining or surveying operation in which a machine travels over or through a work site to monitor or effect some change to the site geography in real-time. The illustrated embodiments provide an understanding of the broad W095/16228 PCT~S94/13143 principles of the invention, and disclose in detail a preferred application, and are not intended to be limiting. Many other modifications or applications of the invention can be made and still lie within the scope of the appended claims.
Claims (87)
1. Apparatus ( 40, 50, 60) for directing the operations of a mobile geography-altering machine (10) comprising:
(a) digital data storage and retrieval means (126) for storing a first three-dimensional geographic site model (104) representing the desired geography of a site and a second three-dimensional geographic site model (106) representing the actual geography of the site;
(b) means (120) for generating digital signals representing in real time the instantaneous position in three-dimensional space of at least a portion of the machine (10) as it traverses the site (12);
(c) means (124) for receiving said signals and for updating the second model (430) in accordance therewith;
(d) means (124) for determining and updating the difference between the first and second models (420, 430) in real time; and (e) means (128) for directing the operation of said machine (10) in accordance with the difference to bring the updated second model (430) into conformity with the first model (420).
(a) digital data storage and retrieval means (126) for storing a first three-dimensional geographic site model (104) representing the desired geography of a site and a second three-dimensional geographic site model (106) representing the actual geography of the site;
(b) means (120) for generating digital signals representing in real time the instantaneous position in three-dimensional space of at least a portion of the machine (10) as it traverses the site (12);
(c) means (124) for receiving said signals and for updating the second model (430) in accordance therewith;
(d) means (124) for determining and updating the difference between the first and second models (420, 430) in real time; and (e) means (128) for directing the operation of said machine (10) in accordance with the difference to bring the updated second model (430) into conformity with the first model (420).
2. Apparatus (40, 50, 60) as defined in claim 1, wherein the means (120) for generating three-dimensional position signals include a GPS receiver (16, 18).
3. Apparatus (40, 50, 60) as defined in claim 1, wherein the means (120) for generating three-dimensional position signals is carried on the machine (10).
4. Apparatus (40, 50, 60) as defined in claim 3, wherein the machine (10) includes a tool (32) movable relative to the machine (10) for altering the site geography, and the means (120) for generating three-dimensional position signals is mounted on the tool (32).
5. Apparatus (40, 50, 60) as defined in claim 4, further including means (18) on the machine (10) to determine the elevation of the tool (32) relative to the surface of the site (12).
6. Apparatus (40, 50, 60) as defined in claim 1, wherein the means (128) for directing the operation of the machine (10) include an operator display (22).
7. Apparatus (40, 50, 60) as defined in claim 6, wherein the operator display (108) includes a plan view and a profile view of the first and second site models (104, 106) and the difference therebetween.
8. Apparatus (40, 50, 60) as defined in claim 6, wherein the operator display (108) includes a plan view of the site models (104, 106) and the difference therebetween.
9. Apparatus (40, 50, 60) as defined in claim 6, wherein the operator display (108) includes a profile view of the site models (104, 106) and the difference therebetween.
10. Apparatus (40, 50, 60) as defined in claim 7, wherein the operator display (108) includes a real-time display of the position of the mobile machine (10) relative to the site models (104, 106).
11. Apparatus (40, 50, 60) as defined in claim 8, wherein the operator display (108) includes real-time coarse and fine indicators of the difference between the site models ( 104, 106) at the position of the mobile machine (10).
12. Apparatus (40, 50, 60) as defined in claim 6, wherein the operator display (108) is carried on the mobile machine (10).
13. Apparatus (40, 50, 60) as defined in claim 6, wherein the operator display (108) is located off the mobile machine (10).
14. Apparatus (40, 50, 60) as defined in claim 1, wherein the means (124) for receiving the position signals and updating the second model (430), and the means (124) for determining the difference between the first and second models (420, 430) are located on the machine (10).
15. Apparatus (40, 50, 60) as defined in claim 1, wherein the means (124) for receiving the position signals and updating the second model (430), and the means (124) for determining the difference between the first and second models (420, 430) are located off the machine (10).
16. Apparatus (40, 50, 60) as defined in claim 1, wherein the means (128) for directing the operation of the machine include closed-loop automatic control means (470) connected to actuate one or more operating systems on the machine (10).
17. Apparatus (40, 50, 60) as defined in claim 1, wherein the machine (10) comprises a site contouring machine, the first site model (104) comprises a static three-dimensional model of the desired site geography, and the difference between the first and second models (104, 106) comprises the elevation difference between the actual site geography and the desired site geography.
18. Apparatus (40, 50, 60) as defined in claim 1, further including differencing means (124) for determining in real time the path of the machine (10) relative to the site (12) between position readings.
19. Apparatus (40, 50, 60) as defined in claim 18, wherein the differencing means (124) includes means for determining an effective width of a geography-altering portion of the machine (10) which is of a magnitude less than or equal to its actual width.
20. Apparatus (40, 50, 60) as defined in claim 19, wherein the differencing means (124) includes means (62) for determining the area of the site (12) traversed by the geography-altering portion (32) of the machine between position readings, and means (62) for updating the area of the second site model (106) altered by the effective width of the geography-altering portion (32).
21. A method of directing the operation of a mobile geography-altering machine (10) comprising the steps of:
(a) producing and storing in a digital data storage and retrieval means (126) both a first three-dimensional geographic site model (104) representing the desired geography of a site and a second three-dimensional geographic site model (106) representing the actual geography of the site;
(b) generating signals (120) representing in real time the instantaneous position in three-dimensional space of at least a portion of the machine (10) as it traverses the site (12);
(c) updating the second model (430) in accordance with said three-dimensional position signals;
(d) determining and updating the difference between the first and second site models (420, 430);
and (e) directing the operation of said machine (10) in accordance with the difference to bring the updated second site model (430) into conformity with the first site model (420).
(a) producing and storing in a digital data storage and retrieval means (126) both a first three-dimensional geographic site model (104) representing the desired geography of a site and a second three-dimensional geographic site model (106) representing the actual geography of the site;
(b) generating signals (120) representing in real time the instantaneous position in three-dimensional space of at least a portion of the machine (10) as it traverses the site (12);
(c) updating the second model (430) in accordance with said three-dimensional position signals;
(d) determining and updating the difference between the first and second site models (420, 430);
and (e) directing the operation of said machine (10) in accordance with the difference to bring the updated second site model (430) into conformity with the first site model (420).
22. A method as defined in claim 21, wherein the three-dimensional position signals are generated by a GPS receiver (16, 18).
23. A method as defined in claim 21, wherein the three-dimensional position signals are generated by means (18) carried on the machine (10).
24. A method as defined in claim 21, wherein the machine (10) includes a tool (32) movable relative to the machine (10) and the three-dimensional position signals are generated in response to the position of means carried on the tool (32).
25. A method as defined in claim 24, further including the step of providing the tool (32) with means to determine the elevation of the tool (32) relative to the surface of the site (12).
26. A method as defined in claim 21, wherein the step of directing the operation of the machine (10) in accordance with the difference between the first and second site models (104, 106) includes providing an operator display (108) of the difference between the first and second site models (104, 106).
27. A method as defined in claim 26, further including the step of displaying the difference between the first and second site models (104, 106) in a plan view and a profile view.
28. A method as defined in claim 26, further including the step of displaying the difference between the first and second site models (104, 106) in a plan view.
29. A method as defined in claim 26, further including the step of displaying the difference between the first and second site models (104, 106) in a profile view.
30. A method as defined in claim 26, further including the step of displaying a real time position of the machine (10) relative to the first and second site models (104, 106).
31. A method as defined in claim 26, further including the step of providing the operator display (108) on the machine (10).
32. Apparatus (40, 50, 60) as defined in claim 26, further including the step of providing the operator display (108) off the machine (10).
33. Apparatus (40, 50, 60) as defined in claim 21, wherein the steps of updating the second model (430) and determining the difference between the first and second models (420, 430) are carried out by means (18) on the machine
34. Apparatus (40, 50, 60) as defined in claim 21, wherein the steps of updating the second model (430) and determining the difference between the first and second models (420, 430) are carried out by means off the machine.
35. A method as defined in claim 21, wherein the step of directing the operation of the machine (10) in accordance with the difference between the first and second site models (104, 106) includes the step of delivering a signal to control operation of one of a machine system and tool and bring the second site model (106) into conformity with the first site model (104).
36. A method as defined in claim 21, wherein the machine (10) is a site contouring machine, said first site model (104) comprises a static three-dimensional model of the desired site geography, and the difference between the first and second models (420, 430) is determined as the elevation difference between the actual site geography and the desired site geography.
37. A method as defined in claim 21, wherein the step of updating the second model (430) in accordance with the position of the machine (10) includes the step of determining in real time the path of the machine (10) relative to the site between the position readings.
38. A method as defined in claim 21, further including the step of determining an effective width for a geography-altering portion (32) of the machine (10) which is of a magnitude less than or equal to its actual width.
39. A method as defined in claim 38, further including the step of determining the area of the site traversed by the geography-altering portion (32) of the machine (10) between position readings, and updating the area of the second site model (106) traversed by the effective width of the geography-altering portion (32).
40. A system for accurately monitoring and controlling the geography of a work site and machinery operating on the work site (12), comprising:
a mobile machine (10) for going over or through and altering the geography of the site, the machine (10) equipped with positioning means (40, 50) to accurately determine in real time the instantaneous position (100) of at least a portion of the machine (10) in three dimensions as it moves relative to the site (12);
a digital data storage facility (40) in communication with the positioning means (40, 50) on the machine (10);
a first three-dimensional model (104) of a desired site geography, and a second three-dimensional model (106) of the actual site geography, the first and second site models (104, 106) stored in the digital data storage facility (40);
dynamic database (400) means communicating with the digital data storage facility (40) and the positioning means (40, 50), the dynamic database (400) means monitoring the position of the machine (10) relative to the site (12) in real time and updating the second site model (106) in real time in response to the monitored position of the machine (10) as it traverses the site (12), the dynamic database (400) means further generating signals representing the updated real time difference between the first and second site models (104, 106) for directing the operation of the machine (10) to bring the second updated site model (106) into conformity with the first site model (104).
a mobile machine (10) for going over or through and altering the geography of the site, the machine (10) equipped with positioning means (40, 50) to accurately determine in real time the instantaneous position (100) of at least a portion of the machine (10) in three dimensions as it moves relative to the site (12);
a digital data storage facility (40) in communication with the positioning means (40, 50) on the machine (10);
a first three-dimensional model (104) of a desired site geography, and a second three-dimensional model (106) of the actual site geography, the first and second site models (104, 106) stored in the digital data storage facility (40);
dynamic database (400) means communicating with the digital data storage facility (40) and the positioning means (40, 50), the dynamic database (400) means monitoring the position of the machine (10) relative to the site (12) in real time and updating the second site model (106) in real time in response to the monitored position of the machine (10) as it traverses the site (12), the dynamic database (400) means further generating signals representing the updated real time difference between the first and second site models (104, 106) for directing the operation of the machine (10) to bring the second updated site model (106) into conformity with the first site model (104).
41. A system as defined in claim 40, further including operator display means (108) for communicating said signals with the dynamic database means (400), and displaying the difference between the first and second site models (104, 106) and the position of the machine (10) relative to the site (12).
42. A system as defined in claim 41, wherein the operator display (108) is located on the machine (10).
43. A system as defined in claim 41, wherein the operator display (108) is located off the machine (10).
44. A system as defined in claim 40, wherein the dynamic database means (400) is located on the machine (10).
45. A system as defined in claim 40, wherein the dynamic database means (400) is located off the machine (10).
46. A system as defined in claim 40, further including automatic control means on the machine (10) in communication with the dynamic database means (400), the signals representing the difference between the first and second site models (104, 106) operating the automatic control means to bring the second site model (106) into conformity with the first site model (104).
47. A system as defined in claim 40, wherein the positioning means comprise a GPS receiver (16, 18).
48. A system as defined in claim 40, wherein the positioning means are mounted on the machine (10) at a known position relative to a portion of the machine (10) in contact with the site surface.
49. A system as defined in claim 40, wherein the machine (10) includes a tool (32) movable relative to the machine (10) to alter the site (12), said positioning means being mounted to move with the tool (32).
50. A system as defined in claim 49, wherein the tool (32) is further provided with a proximity detecting means (19) to determine the elevation of the tool (32) relative to the surface of the site.
51. A system as defined in claim 40, wherein the machine (10) is provided with positioning means (18) located at first and second spaced locations on the machine (10), said positioning means (18) at the second location providing a directional reference relative to the positioning means (18) at the first location.
52. A system as defined in claim 40, wherein the dynamic database (400) includes differencing means (124) for determining in real time the path of the machine (10) relative to the site between position readings.
53. A system as defined in claim 52, wherein the machine (10) includes a geography-altering portion (32) of continuous width, and the dynamic database means (400) includes means (124) for determining an effective width for the geography-altering portion (32) which is of a magnitude less than or equal to its actual width.
54. A system as defined in claim 53, wherein the differencing means (124) includes a fill-in-the-polygon algorithm for determining the path traversed by the geography-altering portion (32) of the machine (10) between position readings.
55. A system as defined in claim 54, wherein the dynamic database (400) means further includes means (62) for updating the area of the second site model traversed by the geography-altering portion (32) of the machine (10).
56. A method for determining the path in real time of a mobile geography-altering machine (10) over a geographic site, comprising the steps of:
providing a model of the site geography subdivided into a continuous matrix of unit areas;
equipping the mobile machine (10) with means (40, 50) for determining the position in three-dimensional space of at least a portion of the machine (10) as it traverses the site (12);
tracking the position of the machine (10) while it traverses the site (12) as a series of coordinate points on the site model (104, 106);
determining physical parameters of an operative portion (32) of the machine (10) as a function of the unit areas of the site model (104, 106); and, determining a path of the machine (10) relative to the site (12) in real time, the path comprising the unit areas of the site model (104,106) traversed by the operative portion (32) of the machine (10) between coordinate points.
providing a model of the site geography subdivided into a continuous matrix of unit areas;
equipping the mobile machine (10) with means (40, 50) for determining the position in three-dimensional space of at least a portion of the machine (10) as it traverses the site (12);
tracking the position of the machine (10) while it traverses the site (12) as a series of coordinate points on the site model (104, 106);
determining physical parameters of an operative portion (32) of the machine (10) as a function of the unit areas of the site model (104, 106); and, determining a path of the machine (10) relative to the site (12) in real time, the path comprising the unit areas of the site model (104,106) traversed by the operative portion (32) of the machine (10) between coordinate points.
57. A method as defined in claim 56, wherein the parameters of the operative portion (32) of the machine (10) are determined as effective parameters which are less than or equal to its actual parameters, and the path of the machine (10) over the site (12) as represented on the site model (104, 106) is determined by the path of the effective parameters of the operative portion (32).
58. A method as defined in claim 57, wherein the step of determining the effective parameters of the operative portion (32) of the machine (10) includes the step of determining an effective width of the operative portion (32) which is less than its actual width.
59. A method as defined in claim 58, wherein the effective width is determined by locating each effective end of the operative portion (32) of the machine (10) from each actual end a distance corresponding to a fraction of the width of one unit area on the site model (104, 106).
60. A method as defined in claim 58, wherein the operative portion of the machine (10) comprises an earth-contouring blade (32) of continuous width.
61. A method as defined in claim 58, wherein the operative portion of the machine (10) comprises a plurality of geography-altering portions (32).
62. A method as defined in claim 57, further including the step of updating the geography of each unit area of the site model (37) over which the effective parameters are determined to have passed.
63. An apparatus (40, 50, 60) for determining the path in real time of a mobile geography-altering machine (10) over a geographic site (12), comprising:
a model (36) of the site geography subdivided into a continuous matrix of unit areas (37), stored in a digital storage facility (126);
a mobile machine (10) equipped with means (120) for determining the instantaneous position in three-dimensional space of at least a portion of the machine (10) as it traverses the site (12);
means (124) communicating with the digital storage facility (126) and the position-determining means (120) for tracking the instantaneous position of the machine (10) while it traverses the site (12) as a series of coordinate points on the site model (104, 106);
means (470) for determining physical parameters of an operative portion (32) of the machine (10) as a multiple of the unit areas (37) of the site model (104, 106); and, means (124) for determining the path of the machine (10) relative to the site (12) in real time, the path comprising the unit areas (37) of the site model (104,106) traversed by the operative portion (32) of the machine (10) between coordinate points.
a model (36) of the site geography subdivided into a continuous matrix of unit areas (37), stored in a digital storage facility (126);
a mobile machine (10) equipped with means (120) for determining the instantaneous position in three-dimensional space of at least a portion of the machine (10) as it traverses the site (12);
means (124) communicating with the digital storage facility (126) and the position-determining means (120) for tracking the instantaneous position of the machine (10) while it traverses the site (12) as a series of coordinate points on the site model (104, 106);
means (470) for determining physical parameters of an operative portion (32) of the machine (10) as a multiple of the unit areas (37) of the site model (104, 106); and, means (124) for determining the path of the machine (10) relative to the site (12) in real time, the path comprising the unit areas (37) of the site model (104,106) traversed by the operative portion (32) of the machine (10) between coordinate points.
64. An apparatus (40, 50, 60) as defined in claim 63, wherein the means (470) for determining the physical parameters include means for determining effective parameters of the operative portion (32) of the machine (10) which are less than or equal to its actual parameters, and the means (124) for determining the path of the machine (10) over the site (12) as represented on the site model (104, 106) include means (124) for determining the path of the effective parameters of the operative portion (32).
65. An apparatus (40, 50, 60) as defined in claim 64, wherein the effective parameters of the operative portion (32) of the machine (10) comprise an effective width of the operative portion (32) which is less than its actual width.
66. An apparatus (40, 50, 60) as defined in claim 65, wherein the effective width is defined between effective ends of the operative portion (32) of the machine (10) spaced from each actual end a fraction of the width of one unit area on the site model (37).
67. An apparatus (40, 50, 60) as defined in claim 65, wherein the operative portion (32) of the machine (10) comprises an earth-contouring blade of continuous width.
68. An apparatus (40, 50, 60) as defined in claim 65, wherein the operative portion (32) of the machine (10) comprises a plurality of geography-altering portions of continuous width.
69. An apparatus (40, 50, 60) as defined in claim 64, further including means for updating the geography of each unit area of the site model (37) over which the effective parameters are determined to have passed.
70. A method for precisely determining the position of a machine (10) in three-dimensional space relative to a land site using three-dimensional position signals and a digitized model of the site (12), and for displaying and directing the progress of work performed on the site (12) by the machine (10), the invention comprising the steps of:
(a) equipping the machine (10) to receive position signals representing in real time the instantaneous position in three-dimensional space of a portion of the machine (10) as it traverses the site (12);
(b) producing and storing an actual site model (430) representing the actual geography of the site (12) and a desired site model (420) comprising a static three-dimensional model of a desired site geography, the actual model (430) of the site geography subdivided into a continuous matrix of unit areas in a digital data storage facility (126);
(c) determining the physical parameters of an operative portion of the machine (10) as a function of unit areas of the site model (430), the parameters of the operative portion of the machine (10) comprising effective parameters which are less than or equal to its actual parameters;
(d) tracking the position of the machine (10) while it traverses the site (12) as a series of three-dimensional coordinate points;
(e) determining a path of the machine in real time comprising the unit areas traversed by the effective parameters of the operative portion of the machine (10) between coordinate points;
(f) operating the machine (10) on the site (12) while simultaneously updating the actual site model (430) in the storage facility (126) in real time according to the path of the operative portion of the machine (10) relative to the site (12), and displaying to the operator of the machine (10) in real time the actual site model (430), the desired site model (420), a current difference between the actual and desired site models (430,420), and the position of the machine (10) relative to the actual and desired site models (430,420).
(a) equipping the machine (10) to receive position signals representing in real time the instantaneous position in three-dimensional space of a portion of the machine (10) as it traverses the site (12);
(b) producing and storing an actual site model (430) representing the actual geography of the site (12) and a desired site model (420) comprising a static three-dimensional model of a desired site geography, the actual model (430) of the site geography subdivided into a continuous matrix of unit areas in a digital data storage facility (126);
(c) determining the physical parameters of an operative portion of the machine (10) as a function of unit areas of the site model (430), the parameters of the operative portion of the machine (10) comprising effective parameters which are less than or equal to its actual parameters;
(d) tracking the position of the machine (10) while it traverses the site (12) as a series of three-dimensional coordinate points;
(e) determining a path of the machine in real time comprising the unit areas traversed by the effective parameters of the operative portion of the machine (10) between coordinate points;
(f) operating the machine (10) on the site (12) while simultaneously updating the actual site model (430) in the storage facility (126) in real time according to the path of the operative portion of the machine (10) relative to the site (12), and displaying to the operator of the machine (10) in real time the actual site model (430), the desired site model (420), a current difference between the actual and desired site models (430,420), and the position of the machine (10) relative to the actual and desired site models (430,420).
71. Cancelled
72. Cancelled
73. Cancelled
74. Cancelled
75. A method as defined in claim 70, wherein the operator display means (108) are located on the machine (10).
76. A method as defined in claim 70, wherein the operator display means (108) are located off the machine (10).
77. A method as defined in claim 75, wherein the digital data storage facility (126) are located on the machine (10).
78. A method as defined in claim 75, wherein the digital data storage facility (126) are located off the machine (10), the apparatus (40, 50, 60) further including means for transmitting signals representing the updated site model (37) from the dynamic database means (400) off the machine (10) to the operator display means (108) on the machine (10), and means for transmitting the position of the machine (10) to the dynamic database (400).
79. An apparatus (40, 50, 60) for precisely determining the position of a machine (10) in three-dimensional space relative to a land site using three-dimensional position signals in a digitized model of the site, comprising:
(a) a mobile machine (10) equipped with means (124) for receiving the position signals and for determining the instantaneous position in three-dimensional space of at least a portion of the machine (10) as it traverses the site (12);
(b) a model of the site geography stored in a digital data storage facility (126);
(c) dynamic database means (400) communicating with the means (470) for determining the machine position and the digital data storage facility (126), the dynamic database means (400) including means (62) for updating the site model in the storage facility (126) in real time according to the three-dimensional position of at least a portion of the machine (10) relative to the site (12), wherein the site model is an actual site model (430) representing the actual geography of the site (12), and a desired site model (420) is stored in the digital storage facility (126), the dynamic database means (400) including differencing means for determining in real time the difference between the actual site model (430) and the desired site model (420) as the actual site model (430) is updated and for determining in real time the path of the machine (10) relative to the site (12) between position readings, the dynamic database (400) including means for determining an effective width for the operative portion of the machine (10) which is of a magnitude less than or equal to its actual width and means for updating the area of the second site model (106) traversed by the effective width of the opeative portion of the machine (10).
(a) a mobile machine (10) equipped with means (124) for receiving the position signals and for determining the instantaneous position in three-dimensional space of at least a portion of the machine (10) as it traverses the site (12);
(b) a model of the site geography stored in a digital data storage facility (126);
(c) dynamic database means (400) communicating with the means (470) for determining the machine position and the digital data storage facility (126), the dynamic database means (400) including means (62) for updating the site model in the storage facility (126) in real time according to the three-dimensional position of at least a portion of the machine (10) relative to the site (12), wherein the site model is an actual site model (430) representing the actual geography of the site (12), and a desired site model (420) is stored in the digital storage facility (126), the dynamic database means (400) including differencing means for determining in real time the difference between the actual site model (430) and the desired site model (420) as the actual site model (430) is updated and for determining in real time the path of the machine (10) relative to the site (12) between position readings, the dynamic database (400) including means for determining an effective width for the operative portion of the machine (10) which is of a magnitude less than or equal to its actual width and means for updating the area of the second site model (106) traversed by the effective width of the opeative portion of the machine (10).
80. Cancelled
81. Cancelled
82. Cancelled
83. Apparatus (40, 50, 60) as defined in claim 79, wherein the apparatus includes means for displaying the updated site model to an operator of the machine (10) in real time.
84. Apparatus (40, 50, 60) as defined in claim 83, wherein the operator display means (108) are located on the machine (10).
85. Apparatus (40, 50, 60) as defined in claim 83, wherein the operator display means (108) are located off the machine (10).
86. Apparatus (40, 50, 60) as defined in claim 84, wherein the dynamic database means (400) are located on the machine (10).
87. Apparatus (40, 50, 60) as defined in claim 84, wherein the dynamic database means (400) are located off the machine (10), the apparatus further including means for transmitting signals representing the updated site model from the dynamic database means (400) off the machine (10) to the operator display means (108) on the machine (10), and means for transmitting the position of the machine (10) to the dynamic database (400).
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CA002152960A Abandoned CA2152960A1 (en) | 1993-12-08 | 1994-11-18 | Method and apparatus for operating geography-altering machinery relative to a work site |
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EP (1) | EP0682786B1 (en) |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111637897A (en) * | 2019-03-01 | 2020-09-08 | 纳恩博(常州)科技有限公司 | Map updating method, map updating device, storage medium, and processor |
Families Citing this family (192)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07295619A (en) * | 1994-04-25 | 1995-11-10 | Mitsubishi Electric Corp | Numerical controller for machine tool |
JPH08263138A (en) * | 1995-03-24 | 1996-10-11 | Komatsu Ltd | Method and device for generating unmanned dump truck travel course data |
AUPN385195A0 (en) * | 1995-06-29 | 1995-07-20 | Hall, David John | A system for monitoring a movement of a vehicle tool |
GB9518029D0 (en) * | 1995-09-05 | 1995-11-08 | Massey Ferguson Mfg | Tractor with control and information display system |
US5815826A (en) * | 1996-03-28 | 1998-09-29 | Caterpillar Inc. | Method for determining the productivity of an earth moving machines |
DE19629618A1 (en) * | 1996-07-23 | 1998-01-29 | Claas Ohg | Route planning system for agricultural work vehicles |
GB2332799A (en) * | 1996-09-06 | 1999-06-30 | Underground Imaging Inc | Oblique scanning ground penetrating radar |
US6195604B1 (en) | 1996-09-09 | 2001-02-27 | Agco Limited | Tractor with monitoring system |
JP3198403B2 (en) * | 1996-09-13 | 2001-08-13 | 大成建設株式会社 | Slope finishing management system |
DE19647523A1 (en) † | 1996-11-16 | 1998-05-20 | Claas Ohg | Agricultural utility vehicle with a processing device that is adjustable in its position and / or orientation relative to the vehicle |
US5902343A (en) * | 1996-11-22 | 1999-05-11 | Case Corporation | Automatic scaling of GPS field maps |
US5735352A (en) * | 1996-12-17 | 1998-04-07 | Caterpillar Inc. | Method for updating a site database using a triangular irregular network |
US5761095A (en) * | 1997-03-10 | 1998-06-02 | Rgs, Llc | System for monitoring the depth of snow |
US5920318A (en) * | 1997-03-26 | 1999-07-06 | Northrop Grumman Corporation | Method and apparatus for localizing an object within a sector of a physical surface |
US5864060A (en) * | 1997-03-27 | 1999-01-26 | Caterpillar Inc. | Method for monitoring the work cycle of mobile machinery during material removal |
US5987383C1 (en) * | 1997-04-28 | 2006-06-13 | Trimble Navigation Ltd | Form line following guidance system |
US6052647A (en) * | 1997-06-20 | 2000-04-18 | Stanford University | Method and system for automatic control of vehicles based on carrier phase differential GPS |
US5944764A (en) * | 1997-06-23 | 1999-08-31 | Caterpillar Inc. | Method for monitoring the work cycle of earth moving machinery during material removal |
US5918682A (en) * | 1997-08-11 | 1999-07-06 | Caterpillar Inc. | Method for determining a steering technique for an earth moving machine |
US5905968A (en) * | 1997-09-12 | 1999-05-18 | Caterpillar Inc. | Method and apparatus for controlling an earthworking implement to preserve a crown on a road surface |
DE19756676C1 (en) * | 1997-12-19 | 1999-06-02 | Wirtgen Gmbh | Method for cutting road surfaces |
US6076030A (en) * | 1998-10-14 | 2000-06-13 | Carnegie Mellon University | Learning system and method for optimizing control of autonomous earthmoving machinery |
US6168348B1 (en) * | 1998-01-16 | 2001-01-02 | Southern Laser, Inc. | Bi-directional surface leveling system |
US6016118A (en) * | 1998-03-05 | 2000-01-18 | Trimble Navigation Limited | Real time integration of a geoid model into surveying activities |
US6141613A (en) * | 1998-03-18 | 2000-10-31 | Caterpillar Inc. | Apparatus and method for controlling the steering of a tracked machine |
US6625135B1 (en) * | 1998-05-11 | 2003-09-23 | Cargenie Mellon University | Method and apparatus for incorporating environmental information for mobile communications |
US5924493A (en) * | 1998-05-12 | 1999-07-20 | Caterpillar Inc. | Cycle planner for an earthmoving machine |
DE19830858A1 (en) * | 1998-07-10 | 2000-01-13 | Claas Selbstfahr Erntemasch | Device and method for determining a virtual position |
US6085130A (en) * | 1998-07-22 | 2000-07-04 | Caterpillar Inc. | Method and apparatus for selecting a transition scheme for use in transitioning a mobile machine from a first path to a second path |
US6112143A (en) * | 1998-08-06 | 2000-08-29 | Caterpillar Inc. | Method and apparatus for establishing a perimeter defining an area to be traversed by a mobile machine |
US6088644A (en) * | 1998-08-12 | 2000-07-11 | Caterpillar Inc. | Method and apparatus for determining a path to be traversed by a mobile machine |
US7399139B2 (en) * | 1998-10-27 | 2008-07-15 | Somero Enterprises, Inc. | Apparatus and method for three-dimensional contouring |
US6227761B1 (en) | 1998-10-27 | 2001-05-08 | Delaware Capital Formation, Inc. | Apparatus and method for three-dimensional contouring |
IL126962A (en) | 1998-11-09 | 1999-12-22 | Makor Issues & Rights Ltd | Method and system for optimizing transportation route design |
US6278955B1 (en) | 1998-12-10 | 2001-08-21 | Caterpillar Inc. | Method for automatically positioning the blade of a motor grader to a memory position |
US6129156A (en) * | 1998-12-18 | 2000-10-10 | Caterpillar Inc. | Method for automatically moving the blade of a motor grader from a present blade position to a mirror image position |
US6286606B1 (en) | 1998-12-18 | 2001-09-11 | Caterpillar Inc. | Method and apparatus for controlling a work implement |
FR2789770B1 (en) * | 1999-02-12 | 2001-03-23 | Gtm Construction | IMPLEMENTATION METHOD USING A GLOBAL POSITIONING SYSTEM |
US6823249B2 (en) | 1999-03-19 | 2004-11-23 | Agco Limited | Tractor with monitoring system |
FR2792847B1 (en) * | 1999-04-27 | 2001-06-15 | Antoine Costa | DEVICE FOR SECURING, MONITORING MAINTENANCE AND MANAGING THE SKI AREA OF WINTER SPORTS RESORTS |
US6191732B1 (en) | 1999-05-25 | 2001-02-20 | Carlson Software | Real-time surveying/earth moving system |
US6619406B1 (en) | 1999-07-14 | 2003-09-16 | Cyra Technologies, Inc. | Advanced applications for 3-D autoscanning LIDAR system |
FR2800232B1 (en) * | 1999-10-27 | 2002-06-07 | Renault Agriculture | METHOD FOR THE AUTOMATIC GUIDANCE OF A MACHINE AND CORRESPONDING DEVICE |
WO2001016560A2 (en) * | 1999-11-30 | 2001-03-08 | Bombardier Inc. | Method and apparatus for snow depth mapping |
US6282477B1 (en) | 2000-03-09 | 2001-08-28 | Caterpillar Inc. | Method and apparatus for displaying an object at an earthworking site |
JP2001303620A (en) * | 2000-04-19 | 2001-10-31 | Ohbayashi Corp | Land-formation control system |
EP1309878A4 (en) * | 2000-06-23 | 2005-01-05 | Sportvision Inc | Track model constraint for gps position |
JP3407883B2 (en) * | 2000-09-11 | 2003-05-19 | 国際航業株式会社 | Earthwork design support system using digital map data |
JP2002188183A (en) * | 2000-10-12 | 2002-07-05 | Komatsu Ltd | Management device for construction equipment |
US6453227B1 (en) | 2000-12-16 | 2002-09-17 | Caterpillar Inc. | Method and apparatus for providing a display of a work machine at a work site |
EP1229345A3 (en) * | 2001-01-23 | 2003-12-03 | Ruhrgas Aktiengesellschaft | System for Determining the Position of Construction Vehicles or Earth Moving Equipment |
DE10121955A1 (en) * | 2001-01-23 | 2002-07-25 | Ruhrgas Ag | System for determining position of construction vehicles or equipment with earth-moving appliances, includes GPS system for determining position of construction vehicles |
FI20010673A (en) * | 2001-03-30 | 2002-10-01 | Metso Minerals Tampere Oy | Data collection system |
JP4430270B2 (en) * | 2001-08-06 | 2010-03-10 | 本田技研工業株式会社 | Plant control device and air-fuel ratio control device for internal combustion engine |
US6751540B2 (en) * | 2001-10-10 | 2004-06-15 | Caterpillar Inc | Method and apparatus for design placement for earthmoving applications |
US20040257360A1 (en) * | 2001-10-22 | 2004-12-23 | Frank Sieckmann | Method and device for producing light-microscopy, three-dimensional images |
US6597992B2 (en) | 2001-11-01 | 2003-07-22 | Soil And Topography Information, Llc | Soil and topography surveying |
US6880643B1 (en) | 2002-02-07 | 2005-04-19 | Novariant, Inc. | System and method for land-leveling |
US6701239B2 (en) | 2002-04-10 | 2004-03-02 | Caterpillar Inc | Method and apparatus for controlling the updating of a machine database |
US7532967B2 (en) * | 2002-09-17 | 2009-05-12 | Hitachi Construction Machinery Co., Ltd. | Excavation teaching apparatus for construction machine |
DE10260855A1 (en) * | 2002-12-23 | 2004-07-08 | Robert Bosch Gmbh | Method for recognizing object constellations based on distance signals |
US8032659B2 (en) * | 2003-01-21 | 2011-10-04 | Nextio Inc. | Method and apparatus for a shared I/O network interface controller |
US9002565B2 (en) | 2003-03-20 | 2015-04-07 | Agjunction Llc | GNSS and optical guidance and machine control |
JP4233932B2 (en) | 2003-06-19 | 2009-03-04 | 日立建機株式会社 | Work support / management system for work machines |
US20050043872A1 (en) * | 2003-08-21 | 2005-02-24 | Detlef Heyn | Control system for a functional unit in a motor vehicle |
US7181370B2 (en) * | 2003-08-26 | 2007-02-20 | Siemens Energy & Automation, Inc. | System and method for remotely obtaining and managing machine data |
US20050117973A1 (en) * | 2003-09-23 | 2005-06-02 | Nelson Jimmie P. | Method and system for preparing a trench and laying pipe in a trench |
US6845311B1 (en) | 2003-11-04 | 2005-01-18 | Caterpillar Inc. | Site profile based control system and method for controlling a work implement |
US7079931B2 (en) * | 2003-12-10 | 2006-07-18 | Caterpillar Inc. | Positioning system for an excavating work machine |
EP1571515A1 (en) * | 2004-03-04 | 2005-09-07 | Leica Geosystems AG | Method and apparatus for managing data relative to a worksite area |
US7266451B2 (en) * | 2004-03-11 | 2007-09-04 | Trimble Navigation Limited | Shock resistant device |
JP4102324B2 (en) * | 2004-03-29 | 2008-06-18 | 株式会社トプコン | Surveying data processing system, surveying data processing program, and electronic map display device |
EP1600564A1 (en) * | 2004-05-24 | 2005-11-30 | Leica Geosystems AG | Method for controlling a surface modification machine |
US20050283294A1 (en) * | 2004-06-16 | 2005-12-22 | Lehman Allen A Jr | Method and apparatus for machine guidance at a work site |
US7317977B2 (en) * | 2004-08-23 | 2008-01-08 | Topcon Positioning Systems, Inc. | Dynamic stabilization and control of an earthmoving machine |
US20060042804A1 (en) * | 2004-08-27 | 2006-03-02 | Caterpillar Inc. | Work implement rotation control system and method |
US7178606B2 (en) * | 2004-08-27 | 2007-02-20 | Caterpillar Inc | Work implement side shift control and method |
JP4057571B2 (en) * | 2004-09-14 | 2008-03-05 | 株式会社日立情報システムズ | Image analysis system and image analysis method |
US7121355B2 (en) * | 2004-09-21 | 2006-10-17 | Cnh America Llc | Bulldozer autograding system |
JP2006132132A (en) * | 2004-11-04 | 2006-05-25 | Hitachi Constr Mach Co Ltd | Work management device and working machine equipped therewith |
US6954999B1 (en) * | 2004-12-13 | 2005-10-18 | Trimble Navigation Limited | Trencher guidance via GPS |
US7765038B2 (en) * | 2005-02-16 | 2010-07-27 | Lockheed Martin Corporation | Mission planning system for vehicles with varying levels of autonomy |
US7583178B2 (en) * | 2005-03-16 | 2009-09-01 | Datalogic Mobile, Inc. | System and method for RFID reader operation |
US7857071B1 (en) | 2005-08-05 | 2010-12-28 | Topcon Positioning Systems, Inc. | Grade indicator for excavation operations |
US20070044980A1 (en) * | 2005-08-31 | 2007-03-01 | Caterpillar Inc. | System for controlling an earthworking implement |
US20070129869A1 (en) * | 2005-12-06 | 2007-06-07 | Caterpillar Inc. | System for autonomous cooperative control of multiple machines |
US7607863B2 (en) * | 2006-02-02 | 2009-10-27 | Philip Paull | Automated pipe-laying method and apparatus |
US7664530B2 (en) * | 2006-06-09 | 2010-02-16 | AT&I Intellectual Property I, L.P | Method and system for automated planning using geographical data |
US7509198B2 (en) * | 2006-06-23 | 2009-03-24 | Caterpillar Inc. | System for automated excavation entry point selection |
US7725234B2 (en) * | 2006-07-31 | 2010-05-25 | Caterpillar Inc. | System for controlling implement position |
US9746329B2 (en) * | 2006-11-08 | 2017-08-29 | Caterpillar Trimble Control Technologies Llc | Systems and methods for augmenting an inertial navigation system |
US7516563B2 (en) * | 2006-11-30 | 2009-04-14 | Caterpillar Inc. | Excavation control system providing machine placement recommendation |
US7865285B2 (en) | 2006-12-27 | 2011-01-04 | Caterpillar Inc | Machine control system and method |
US9615501B2 (en) | 2007-01-18 | 2017-04-11 | Deere & Company | Controlling the position of an agricultural implement coupled to an agricultural vehicle based upon three-dimensional topography data |
US7908062B2 (en) * | 2007-02-28 | 2011-03-15 | Caterpillar Inc. | System and method for preparing a worksite based on soil moisture map data |
US8083004B2 (en) | 2007-03-29 | 2011-12-27 | Caterpillar Inc. | Ripper autodig system implementing machine acceleration control |
WO2008130610A1 (en) * | 2007-04-20 | 2008-10-30 | Mark Williams | Vertical curve system for surface grading |
US20100023228A1 (en) * | 2007-07-13 | 2010-01-28 | Montgomery James L | Apparatus and method for the positioning of a tool of a ground engaging vehicle |
US7870684B2 (en) * | 2007-08-20 | 2011-01-18 | Davco Farming | Method and system for optimising land levelling designs |
US7594441B2 (en) * | 2007-09-27 | 2009-09-29 | Caterpillar Inc. | Automated lost load response system |
US8351684B2 (en) * | 2008-02-13 | 2013-01-08 | Caterpillar Inc. | Terrain map updating system |
US20090219199A1 (en) * | 2008-02-29 | 2009-09-03 | Caterpillar Inc. | Positioning system for projecting a site model |
US9176235B2 (en) * | 2008-04-11 | 2015-11-03 | Caterpillar Trimble Control Technologies Llc | System and method for presenting topographical data for an earthmoving operation |
US9733792B2 (en) * | 2008-10-27 | 2017-08-15 | Autodesk, Inc. | Spatially-aware projection pen |
US8090508B2 (en) * | 2008-12-22 | 2012-01-03 | Deere & Company | Method and system for determining a planned path for a machine |
US8282312B2 (en) * | 2009-01-09 | 2012-10-09 | Caterpillar Inc. | Machine system operation and control strategy for material supply and placement |
BE1018564A4 (en) * | 2009-01-12 | 2011-03-01 | Dredging Int | METHOD AND DEVICE FOR DRIVING A MOBILE GROUND TREATMENT DEVICE |
US8386129B2 (en) | 2009-01-17 | 2013-02-26 | Hemipshere GPS, LLC | Raster-based contour swathing for guidance and variable-rate chemical application |
US20100217640A1 (en) * | 2009-02-20 | 2010-08-26 | Mark Nichols | Method and system for adaptive construction sequencing |
US20110148856A1 (en) * | 2009-12-18 | 2011-06-23 | Caterpillar Inc. | Parameter Visualization System |
DE102009059106A1 (en) | 2009-12-18 | 2011-06-22 | Wirtgen GmbH, 53578 | Self-propelled construction machine and method for controlling a self-propelled construction machine |
US20110153170A1 (en) * | 2009-12-23 | 2011-06-23 | Caterpillar Inc. | System And Method For Controlling An Implement To Maximize Machine Productivity And Protect a Final Grade |
EP2353353A1 (en) * | 2010-02-05 | 2011-08-10 | Flander's Mechatronics Technology Centre v.z.w. | In use adaptation of schedule for multi-vehicle ground processing operations |
US20110213529A1 (en) * | 2010-02-26 | 2011-09-01 | Caterpillar Inc. | System and method for determing a position on an implement relative to a reference position on a machine |
WO2011150353A1 (en) * | 2010-05-28 | 2011-12-01 | Gvm, Inc. | Remote management system for equipment |
JP5303798B2 (en) * | 2010-07-16 | 2013-10-02 | 株式会社小松製作所 | Unmanned vehicle traveling system and traveling control method thereof |
WO2012061890A1 (en) * | 2010-11-10 | 2012-05-18 | Interactive Machine Systems Pty Limited | Assistance system for steering a machine tool |
US8626404B2 (en) | 2010-11-19 | 2014-01-07 | Caterpillar Inc. | Motor grader wheel slip control for cut to grade |
JP5059954B2 (en) | 2011-02-22 | 2012-10-31 | 株式会社小松製作所 | Excavator display system and control method thereof. |
EP3199751B1 (en) | 2011-08-03 | 2018-11-21 | Joy Global Underground Mining LLC | Automated operations of a mining machine |
US8548690B2 (en) * | 2011-09-30 | 2013-10-01 | Komatsu Ltd. | Blade control system and construction machine |
US8649944B2 (en) * | 2011-10-06 | 2014-02-11 | Komatsu Ltd. | Blade control system, construction machine and blade control method |
DE102012001289A1 (en) | 2012-01-25 | 2013-07-25 | Wirtgen Gmbh | Self-propelled construction machine and method for controlling a self-propelled construction machine |
US9336627B2 (en) * | 2012-03-12 | 2016-05-10 | Hntb Holdings Ltd. | Creating a model of a scanned surface for comparison to a reference-surface model |
US9552445B2 (en) | 2012-03-28 | 2017-01-24 | Trimble Inc. | Automatic change propagation in an area-based open pit mine designer |
US9589076B2 (en) * | 2012-03-28 | 2017-03-07 | Trimble Inc. | Area-based open pit mine designer |
AU2014202349A1 (en) | 2012-08-02 | 2014-05-22 | Harnischfeger Technologies, Inc. | Depth-related help functions for a wheel loader training simulator |
US9574326B2 (en) | 2012-08-02 | 2017-02-21 | Harnischfeger Technologies, Inc. | Depth-related help functions for a shovel training simulator |
US8989968B2 (en) | 2012-10-12 | 2015-03-24 | Wirtgen Gmbh | Self-propelled civil engineering machine system with field rover |
CA2834643C (en) * | 2012-11-27 | 2022-01-04 | Technological Resources Pty Ltd | A method of surveying and a surveying system |
US9228315B2 (en) * | 2012-12-20 | 2016-01-05 | Caterpillar Inc. | System and method for modifying a path for a machine |
US9045871B2 (en) | 2012-12-27 | 2015-06-02 | Caterpillar Paving Products Inc. | Paving machine with operator directed saving and recall of machine operating parameters |
US20140214187A1 (en) * | 2013-01-31 | 2014-07-31 | Caterpillar Inc. | RC/Autonomous Machine Mode Indication |
JP5789279B2 (en) * | 2013-04-10 | 2015-10-07 | 株式会社小松製作所 | Excavation machine construction management device, hydraulic excavator construction management device, excavation machine and construction management system |
US10204388B2 (en) * | 2013-04-19 | 2019-02-12 | Trimble Inc. | Method, system, and medium of construction project management |
USD742891S1 (en) * | 2013-04-23 | 2015-11-10 | Eidetics Corporation | Display screen or portion thereof with a graphical user interface |
US9096977B2 (en) | 2013-05-23 | 2015-08-04 | Wirtgen Gmbh | Milling machine with location indicator system |
CN103392533B (en) * | 2013-07-04 | 2015-10-28 | 北京农业智能装备技术研究中心 | Put a machine and control method thereof |
WO2015031797A1 (en) | 2013-08-29 | 2015-03-05 | Joy Mm Delaware, Inc. | Shearer anti-collision |
DE102013221301A1 (en) * | 2013-10-21 | 2015-04-23 | Mts Maschinentechnik Schrode Ag | Method for calibrating the position of a construction machine in a construction site plan |
US20150153456A1 (en) * | 2013-12-02 | 2015-06-04 | Hemisphere Gnss Inc. | Integrated machine guidance system |
US20150154247A1 (en) * | 2013-12-03 | 2015-06-04 | Caterpillar Inc. | System and method for surface data management at worksite |
US9733643B2 (en) | 2013-12-20 | 2017-08-15 | Agjunction Llc | Hydraulic interrupter safety system and method |
US9651381B2 (en) | 2014-01-10 | 2017-05-16 | Caterpillar Inc. | Terrain mapping system using virtual tracking features |
US9234329B2 (en) * | 2014-02-21 | 2016-01-12 | Caterpillar Inc. | Adaptive control system and method for machine implements |
US10503249B2 (en) | 2014-07-03 | 2019-12-10 | Topcon Positioning Systems, Inc. | Method and apparatus for construction machine visualization |
DE102014012836B4 (en) | 2014-08-28 | 2018-09-13 | Wirtgen Gmbh | Self-propelled construction machine and method for visualizing the processing environment of a construction machine moving in the field |
DE102014012825A1 (en) | 2014-08-28 | 2016-03-03 | Wirtgen Gmbh | Self-propelled construction machine and method for controlling a self-propelled construction machine |
DE102014012831B4 (en) | 2014-08-28 | 2018-10-04 | Wirtgen Gmbh | Self-propelled construction machine and method for controlling a self-propelled construction machine |
US10162350B2 (en) * | 2014-09-10 | 2018-12-25 | Universal City Studios Llc | Systems and methods for controlling the transportation of vehicles |
US9388550B2 (en) * | 2014-09-12 | 2016-07-12 | Caterpillar Inc. | System and method for controlling the operation of a machine |
JP6382688B2 (en) * | 2014-11-06 | 2018-08-29 | 日立建機株式会社 | Map generator |
US9328479B1 (en) * | 2015-02-05 | 2016-05-03 | Deere & Company | Grade control system and method for a work vehicle |
US10186004B2 (en) | 2015-05-20 | 2019-01-22 | Caterpillar Inc. | System and method for evaluating a material movement plan |
AU2016283735A1 (en) * | 2015-06-23 | 2017-12-21 | Komatsu Ltd. | Construction management system and construction management method |
EP3351692A4 (en) | 2015-09-15 | 2018-09-05 | Sumitomo (S.H.I.) Construction Machinery Co., Ltd. | Shovel |
JP6616149B2 (en) * | 2015-10-05 | 2019-12-04 | 株式会社小松製作所 | Construction method, work machine control system, and work machine |
DE102015221356B4 (en) | 2015-10-30 | 2020-12-24 | Conti Temic Microelectronic Gmbh | Device and method for providing a vehicle panoramic view |
WO2017105308A1 (en) * | 2015-12-18 | 2017-06-22 | Volvo Construction Equipment Ab | System and method for determining a material entity to be removed from a pile and a control unit for a working machine comprising such a system. |
US10924881B2 (en) * | 2016-03-03 | 2021-02-16 | Husqvarna Ab | Device for determining construction device and worker position |
DE112017000279T5 (en) * | 2016-03-30 | 2018-09-13 | Komatsu Ltd. | SIMULATION SYSTEM AND SIMULATION PROCEDURE |
KR102298318B1 (en) * | 2016-03-30 | 2021-09-03 | 스미토모 겐키 가부시키가이샤 | Shovel and shovel display device |
KR102333458B1 (en) | 2016-03-31 | 2021-11-30 | 스미토모 겐키 가부시키가이샤 | Shovel and shovel display device |
JP7122800B2 (en) * | 2016-08-05 | 2022-08-22 | 株式会社小松製作所 | WORK VEHICLE CONTROL SYSTEM, CONTROL METHOD, AND WORK VEHICLE |
JP6871695B2 (en) * | 2016-08-05 | 2021-05-12 | 株式会社小松製作所 | Work vehicle control system, control method, and work vehicle |
JP7122802B2 (en) * | 2016-08-05 | 2022-08-22 | 株式会社小松製作所 | WORK VEHICLE CONTROL SYSTEM, CONTROL METHOD, AND WORK VEHICLE |
US10316491B2 (en) * | 2016-08-08 | 2019-06-11 | Caterpillar Inc. | Machine control system having multi-blade position coordination |
US10552775B2 (en) | 2016-11-29 | 2020-02-04 | Caterpillar Inc. | System and method for optimizing a material moving operation |
JP6878317B2 (en) * | 2017-01-31 | 2021-05-26 | 株式会社小松製作所 | Work vehicle control system and work machine trajectory setting method |
WO2018179962A1 (en) * | 2017-03-30 | 2018-10-04 | 株式会社小松製作所 | Control system for work vehicle, method for setting trajectory of work machine, and work vehicle |
WO2018179383A1 (en) * | 2017-03-31 | 2018-10-04 | 株式会社小松製作所 | Control system for work vehicle, and method for setting trajectory for work machine |
WO2019012992A1 (en) * | 2017-07-14 | 2019-01-17 | 株式会社小松製作所 | Display control device, display control method, program, and display system |
JP6861598B2 (en) * | 2017-08-29 | 2021-04-21 | 株式会社小松製作所 | Work vehicle control systems, methods, and work vehicles |
JP6910245B2 (en) | 2017-08-29 | 2021-07-28 | 株式会社小松製作所 | Work vehicle control systems, methods, and work vehicles |
JP6910450B2 (en) * | 2017-08-29 | 2021-07-28 | 株式会社小松製作所 | Work vehicle control systems, methods, and work vehicles |
US20190093319A1 (en) * | 2017-09-22 | 2019-03-28 | CNH Industrial America, LLC | Automatic grading systems and related methods for performing grading operations |
US10543782B2 (en) * | 2017-12-19 | 2020-01-28 | Caterpillar Paving Products Inc. | Cutting tool visual trajectory representation system and method |
JP7152170B2 (en) * | 2018-03-28 | 2022-10-12 | 株式会社小松製作所 | WORK VEHICLE CONTROL SYSTEM, METHOD, AND WORK VEHICLE |
JP7169760B2 (en) * | 2018-03-29 | 2022-11-11 | 株式会社小松製作所 | WORK VEHICLE CONTROL SYSTEM, METHOD, AND WORK VEHICLE |
US11761173B2 (en) * | 2018-06-26 | 2023-09-19 | Caterpillar Inc. | Systems and methods for building a pad |
DE102018119962A1 (en) | 2018-08-16 | 2020-02-20 | Wirtgen Gmbh | Self-propelled construction machine and method for controlling a self-propelled construction machine |
US10570588B1 (en) * | 2018-12-21 | 2020-02-25 | Cnh Industrial America Llc | Systems and methods for performing grading operations based on data captured from site markers distributed across a worksite |
CN110172894A (en) * | 2019-06-05 | 2019-08-27 | 郑州路桥建设投资集团有限公司 | Paver based on GPS technology paves trace tracking method |
DE102019118059A1 (en) | 2019-07-04 | 2021-01-07 | Wirtgen Gmbh | Self-propelled construction machine and method for controlling a self-propelled construction machine |
DE102019135225B4 (en) | 2019-12-19 | 2023-07-20 | Wirtgen Gmbh | Method for milling off traffic areas with a milling drum, and milling machine for carrying out the method for milling off traffic areas |
JP2021143498A (en) * | 2020-03-11 | 2021-09-24 | 株式会社小松製作所 | Operation system |
US11236492B1 (en) * | 2020-08-25 | 2022-02-01 | Built Robotics Inc. | Graphical user interface for real-time management of an earth shaping vehicle |
JP2022067404A (en) * | 2020-10-20 | 2022-05-06 | 株式会社シーティーエス | Paving/leveling and rolling compaction management system |
CN112650221B (en) * | 2020-12-03 | 2021-12-03 | 广州极飞科技股份有限公司 | Flat ground path generation method, flat ground path generation device, processing equipment and storage medium |
US11873617B2 (en) | 2021-02-02 | 2024-01-16 | Deere & Company | Mobile grading machine with improved grading control system |
JP2022169981A (en) * | 2021-04-28 | 2022-11-10 | ヤンマーホールディングス株式会社 | Work machine management method, work machine management system, and work machine management program |
WO2023084794A1 (en) * | 2021-11-15 | 2023-05-19 | 日本電信電話株式会社 | Pipeline position acquiring device, pipeline position acquiring method, and program |
Family Cites Families (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5921835A (en) * | 1982-07-29 | 1984-02-03 | Komatsu Zoki Kk | Finishing work of ground to given shape |
JPS6084610A (en) * | 1983-10-17 | 1985-05-14 | Hitachi Ltd | Guiding device |
US4965586A (en) * | 1984-08-16 | 1990-10-23 | Geostar Corporation | Position determination and message transfer system employing satellites and stored terrain map |
JPS63135815A (en) * | 1986-11-28 | 1988-06-08 | Komatsu Ltd | On-vehicle display apparatus |
US4807131A (en) * | 1987-04-28 | 1989-02-21 | Clegg Engineering, Inc. | Grading system |
JP2564832B2 (en) * | 1987-06-27 | 1996-12-18 | 神鋼電機株式会社 | Self-supporting unmanned vehicle |
US4982329A (en) * | 1987-06-27 | 1991-01-01 | Shinko Electric Co., Ltd. | Self-contained unmanned vehicle |
JPS6478305A (en) * | 1987-09-21 | 1989-03-23 | Shinko Electric Co Ltd | Input method for outside information on unmanned vehicle |
US5287280A (en) * | 1987-09-14 | 1994-02-15 | Kabushiki Kaisha Komatsu Seisakusho | Method and apparatus for controlling shoe slip of crawler vehicle |
JPH01174247A (en) * | 1987-12-28 | 1989-07-10 | Mitsuba Electric Mfg Co Ltd | Structure for protecting permanent magnet from oxidation in electric rotary machine |
US4915757A (en) * | 1988-05-05 | 1990-04-10 | Spectra-Physics, Inc. | Creation of three dimensional objects |
JP2568109B2 (en) * | 1988-06-13 | 1996-12-25 | 株式会社小松製作所 | Terrain information display device |
JP2523005B2 (en) * | 1988-11-29 | 1996-08-07 | 株式会社小松製作所 | Construction work control system |
JP2772551B2 (en) * | 1989-07-31 | 1998-07-02 | 大成建設株式会社 | Comprehensive construction management method |
WO1991009375A1 (en) * | 1989-12-11 | 1991-06-27 | Caterpillar Inc. | Integrated vehicle positioning and navigation system, apparatus and method |
US5148110A (en) * | 1990-03-02 | 1992-09-15 | Helms Ronald L | Method and apparatus for passively detecting the depth and location of a spatial or temporal anomaly by monitoring a time varying signal emanating from the earths surface |
JPH0470584A (en) * | 1990-07-11 | 1992-03-05 | Mitsubishi Electric Corp | Satellite navigation system |
JPH04174388A (en) * | 1990-11-06 | 1992-06-22 | Komatsu Ltd | Monitor of construction equipment |
DE4133392C1 (en) * | 1991-10-09 | 1992-12-24 | Rheinbraun Ag, 5000 Koeln, De | Determining progress of mining material spreader - receiving signals from at least four satellites at end of tipping arm and at vehicle base and calculating actual geodetic positions and height of material tip |
US5359521A (en) * | 1992-12-01 | 1994-10-25 | Caterpillar Inc. | Method and apparatus for determining vehicle position using a satellite based navigation system |
US5375663A (en) * | 1993-04-01 | 1994-12-27 | Spectra-Physics Laserplane, Inc. | Earthmoving apparatus and method for grading land providing continuous resurveying |
US5471391A (en) * | 1993-12-08 | 1995-11-28 | Caterpillar Inc. | Method and apparatus for operating compacting machinery relative to a work site |
-
1994
- 1994-11-08 ZA ZA948824A patent/ZA948824B/en unknown
- 1994-11-18 EP EP95901247A patent/EP0682786B1/en not_active Expired - Lifetime
- 1994-11-18 CN CN94191115A patent/CN1117317A/en active Pending
- 1994-11-18 WO PCT/US1994/013143 patent/WO1995016228A1/en active IP Right Grant
- 1994-11-18 CA CA002152960A patent/CA2152960A1/en not_active Abandoned
- 1994-11-18 JP JP51619595A patent/JP3645568B2/en not_active Expired - Fee Related
- 1994-11-18 AU AU10563/95A patent/AU682422B2/en not_active Ceased
- 1994-11-18 DE DE69430663T patent/DE69430663T2/en not_active Expired - Lifetime
-
1996
- 1996-02-27 US US08/607,542 patent/US5631658A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111637897A (en) * | 2019-03-01 | 2020-09-08 | 纳恩博(常州)科技有限公司 | Map updating method, map updating device, storage medium, and processor |
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EP0682786A1 (en) | 1995-11-22 |
CN1117317A (en) | 1996-02-21 |
DE69430663D1 (en) | 2002-06-27 |
AU1056395A (en) | 1995-06-27 |
WO1995016228A1 (en) | 1995-06-15 |
AU682422B2 (en) | 1997-10-02 |
JPH08506870A (en) | 1996-07-23 |
DE69430663T2 (en) | 2003-02-06 |
US5631658A (en) | 1997-05-20 |
ZA948824B (en) | 1995-07-11 |
JP3645568B2 (en) | 2005-05-11 |
EP0682786B1 (en) | 2002-05-22 |
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