CN102735896B - A kind of digital multimeter and its implementation with automobile failure diagnosis function - Google Patents
A kind of digital multimeter and its implementation with automobile failure diagnosis function Download PDFInfo
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- CN102735896B CN102735896B CN201210242768.0A CN201210242768A CN102735896B CN 102735896 B CN102735896 B CN 102735896B CN 201210242768 A CN201210242768 A CN 201210242768A CN 102735896 B CN102735896 B CN 102735896B
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Abstract
The present invention relates to a kind of digital multimeter and its implementation with automobile failure diagnosis function, comprise and a multimeter is provided, it is characterized in that: on described multimeter, set up a diagnose interface, this diagnose interface is in order to be connected with described vehicle diagnosis seat, and gather vehicle diagnosis data, then by this diagnostic data and the data being stored in a storer are compared, finally the display of comparison result by described multimeter is shown.The present invention by increasing automobile failure diagnosis function in digital multimeter, not only can the electrical quantity such as measuring voltage, electric current, resistance, also can read automobile fault code and then diagnostic analysis is carried out to vehicle failure, make multimeter become integration test instrument in auto repair, greatly facilitate auto repair personnel and driver to the understanding of vehicle failure and search.
Description
Technical field
The present invention relates to digital multimeter technical field, particularly a kind of digital multimeter and its implementation with automobile failure diagnosis function.
Background technology
As far back as the eighties in last century automobile enter the computing machine control period, each large automobile manufacturing enterprises such as the U.S., day, Europe start to be equipped with OBD (OBD), OBD system development experience OBD I, OBD II and OBD III.U.S. SAE has formulated the OBD II of unified diagnostic mode in the mid-90 in 20th century, makes OBD have unified standard, and this brings many convenience to the fault diagnosis of automobile and Measuring error.
In OBD II system, the signal of Auto Electronic Controlled System occurs abnormal and beyond normal variation range, and ECU is judged as fault, monitor this fault with in the fault memorizer of the form of standard code stored in ECU inside.Along with the development of OBD, automobile electric control system structure is more complicated, fault diagnosis is very difficult, automobile fault diagnostic apparatus is very important instrument in maintenance, user can utilize it promptly to read fault in automobile electric control system, and show failure message by LCDs, find out rapidly the position and reason of breaking down.
Multimeter is the basic tool of electronic surveying and maintenance, is also the irreplaceable important tool of motor vehicle electrician.Although multimeter cannot read automobile fault code, but can the various piece of automobile conventional electrical system and Control System of Microcomputer be detected and be measured, the circuit parameter of these systems, element function, working condition are analyzed and tested, judges and get rid of vehicle microcomputer control circuit fault.Select suitable annex, its test function can also be expanded, directly test physical quantitys such as the pressure on automobile, vacuum, temperature, this is to judging, analyzing that the fault of vehicle microcomputer control system is very favourable.
Along with the increase of China's automobile market recoverable amount, maintenance problem is more and more outstanding.And automotive electronic technology is day by day universal and progressive, electrical control system structure is complicated, make fault diagnosis very difficult, use separate diagnostic instrument also can only provide the direction of a failure judgement, be difficult to the parts or the position that indicate a certain fault particularly, only have and detected by multimeter, just can look for out of order precise location.
Summary of the invention
For solving the defect existing for above-mentioned digital multimeter and automobile fault diagnostic apparatus, the object of this invention is to provide a kind of digital multimeter and its implementation with automobile failure diagnosis function, can a-table-multi-purpose be realized, particularly facilitate vehicle maintenance librarian use.
The present invention adopts following scheme to realize described method: a kind of implementation method with the digital multimeter of automobile failure diagnosis function, comprise and a multimeter is provided, it is characterized in that: on described multimeter, set up a diagnose interface, this diagnose interface is in order to be connected with described vehicle diagnosis seat, and gather vehicle diagnosis data, the then display screen display automobile diagnostic result of described multimeter.
In an embodiment of the present invention, described digital multimeter is further comprising the steps of in use:
Step S01: described diagnose interface is connected with vehicle diagnosis seat;
Step S02: judge whether automobile ignition switch is opened, if opened, enter step S03;
Step S03: carry out protocol identification, reads car data.
In an embodiment of the present invention, described diagnostic result is described diagnostic trouble code.
Diagnostic message corresponding for this diagnostic trouble code by after comparing with the standard failure code table being stored in a storer, then shows by diagnostic trouble code described in an embodiment of the present invention.
The present invention adopts following scheme to realize this digital multimeter: a kind of digital multimeter with automobile failure diagnosis function, is characterized in that, comprising:
One MCU control module;
One multimeter measurement module, this multimeter measurement module is used for measuring the voltage received, electric current, resistance parameter, and measurement result sends to described MCU control module;
One storer, this storer is connected with described MCU control module;
One driver module, it is connected to drive a display screen with described MCU control module;
One functional switch, an output terminal of this functional switch is connected with described MCU control module, to realize the switching between this multimeter test function;
At least two instrument connections, the signal of test is sent to described multimeter measurement module through described functional switch by described instrument connection; And
One diagnose interface, this diagnose interface in order to be connected with described vehicle diagnosis seat, and to be gathered vehicle diagnosis data and is connected with described MCU control module by an interface circuit.
In an embodiment of the present invention, described multimeter measurement module converts measurement result to digital signal by its built-in A/D converter and sends to described MCU control module again.
In an embodiment of the present invention, a multimeter housing is also comprised; Described instrument connection, diagnose interface and LCDs are embedded at the upper surface of this multimeter housing.
In an embodiment of the present invention, described diagnose interface is a Wireless Data Transmission interface.
In an embodiment of the present invention, described storer is used for store test data and automobile failure diagnosis table, and the data in storer upgrade by described diagnose interface.
In an embodiment of the present invention, also comprise a supervisory keyboard, described supervisory keyboard is in order to described MCU control module transmit operation instruction.
The present invention by increasing automobile failure diagnosis function in digital multimeter, not only can the electrical quantity such as measuring voltage, electric current, resistance, also can read automobile fault code and then diagnostic analysis is carried out to vehicle failure, make multimeter become integration test instrument in auto repair, greatly facilitate auto repair personnel and driver to the understanding of vehicle failure and search.
Accompanying drawing explanation
Fig. 1 is automobile failure diagnosis function realizing method process flow diagram in the digital multimeter of the embodiment of the present invention.
Fig. 2 is the schematic block circuit diagram of the embodiment of the present invention.
Fig. 3 is the shell mechanism schematic diagram with the digital multimeter of automobile failure diagnosis function of the embodiment of the present invention.
Wherein: 1 is shell; 2 is display screen; 3 is keyboard; 4 is diagnose interface; 5 is functional switch; 6 is instrument connection.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
The present embodiment provides a kind of implementation method with the digital multimeter of automobile failure diagnosis function, comprise and a multimeter is provided, it is characterized in that: on described multimeter, set up a diagnose interface, this diagnose interface is in order to be connected with described vehicle diagnosis seat, and gather vehicle diagnosis data, the then display screen display automobile diagnostic result of described multimeter.In use, first, described diagnose interface is connected with vehicle diagnosis seat; Secondly, judge whether automobile ignition switch is opened, if opened, carry out protocol identification, read car data, its process flow diagram can see Fig. 1.It is worth mentioning that, the automobile of all OBD II and EOBD equipment all comprises following standardized hardware and software: standardized data diagnosis interface (SAE-J1962), standardized demoder (SAE-J1978), standardized telecommunications agreement (KW2000, CAN, CLASS II, ISO9141 etc.), standardized diagnostic trouble code (DTC) (DTC, SAE-J2012), standardized maintenance service information (SEA-J2000).In OBD-II standard, no-go gage does not determine a kind of communication protocol, but unified most widely used several agreement, be respectively: CAN, ISO9141, KWP2000, SAEJ 1850(PWM), SAEJ 1850(VPW), therefore, system after recognizing corresponding agreement, then carries out the reading of data.
In the present embodiment, above-mentioned diagnostic result can be a diagnostic trouble code, and display screen shows this failure code, this diagnostic trouble code DTC all with English alphabet beginning, after follow 4 numerals.As: P0101, C1234, B2236 etc.The failure system that the letter representation that DTC starts is monitored to: P is power system; B is bodywork system; C is chassis system; U is network or data communication transmission system diagnostic trouble code.Wherein first digit is general code (vehicular manufacturer to all), or manufacturer's private code.Such as: 0 refers to general code, and 1 refers to manufacturer's private code.General Motors Overseas Corporation with regard to helpful you diagnose the specific numeric type coding of technology state of vehicle institute.Second digit indicates affected failure system type, and numeral is fuel oil and air meter system from 1-7:1; 2 is fuel oil and air meter system (refering in particular to spraying system return circuit bad); 3 is firing system or scarce cylinder monitoring system; 4 is additional discharge system; 5 is speed of a motor vehicle control and Wo 2009051153; 6 is computer export line system; 7 is wheel box.So the corresponding diagnostic message of each diagnostic trouble code.In the present embodiment, this diagnostic message (namely diagnosing code table) also can be stored in a storer by we, then by comparison, finds the diagnostic message that described diagnostic trouble code is corresponding, directly sends described display screen to and show.
As shown in Figure 2, the present embodiment also provides a kind of digital multimeter with automobile failure diagnosis function, it is characterized in that, comprising: a MCU control module; One multimeter measurement module, this multimeter measurement module is used for measuring the voltage received, electric current, resistance parameter, and measurement result sends to described MCU control module; One storer, this storer is connected with described MCU control module; One driver module, it is connected to drive a display screen with described MCU control module; One functional switch, an output terminal of this functional switch is connected with described MCU control module, to realize the switching between this multimeter test function; At least two instrument connections, the data of test are sent to described multimeter measurement module through described functional switch by described instrument connection; And a diagnose interface, this diagnose interface in order to be connected with described vehicle diagnosis seat, and to be gathered vehicle diagnosis data and is connected with described MCU control module by an interface circuit.
Specifically, refer to Fig. 3, Fig. 3 is this enforcement shell mechanism schematic diagram, in figure, this shell 1 is embedded with instrument connection 6, functional switch 5, display screen 2, keyboard 3 and diagnose interface 4, this diagnose interface 4 is for being connected with vehicle diagnosis seat with the information in the fault memorizer reading automobile ECU inside.This diagnose interface can be that socket is connected with vehicle diagnosis seat by cable, also can wave point, receives vehicle diagnosis seat wireless telecommunications system in succession.Be noted that this diagnose interface both with ECU connecting communication in automobile, also can be connected with relevant device (as PC), the automotive diagnostic information that upgrading storer stores or multimeter measurement result is transferred to PC.This diagnose interface coordinates interface circuit as shown in Figure 1, automobile computer data is converted to meet specification that MCU control module requires and be meet the specification (such as signal level height) that automobile computer requires by MCU to the instruction transformation that automobile computer sends.
Continue referring to Fig. 2 and Fig. 3, in the present embodiment, instrument connection and digital multimeter are popped one's head in and are connected to detect external signal; Digital multimeter measuring ability pattern determined by functional switch: 1, when realizing multimeter test, MCU is placed in dependence test and arranges by functional switch, and tested voltage, electric current, resistance etc. are connected to multimeter measurement module measure; 2, when realizing automobile failure diagnosis, MCU is placed in vehicle diagnosis function setting by functional switch.Described multimeter measurement module carries out the electric parameter measurements such as voltage, electric current, resistance, and in the present embodiment, this multimeter measurement module carries out digitized processing by the A/D converter in module, and measurement result conversion digital signal is transferred to MCU control module.
In the present embodiment, described keyboard sends certain operations instruction to MCU, such as starts diagnosing protocol communication, transfers automotive diagnostic information or upgrading diagnostic message according to diagnostic trouble code.Storer stores some test datas and automobile failure diagnosis table.Driver module MCU is passed the signal that the data transformations of coming is driving liquid crystal, and LCDs is display measurement data, diagnostic message, associative operation information and interactive interface.
Above-described embodiment is used for illustrative purposes only, those skilled in the art, without departing from the spirit and scope of the present invention, various conversion or change can also be made, therefore, all equivalent technical schemes also should belong to category of the present invention, are limited by each claim.
Claims (2)
1. one kind has the implementation method of the digital multimeter of automobile failure diagnosis function, comprise and a multimeter is provided, it is characterized in that: on described multimeter, set up a diagnose interface, this diagnose interface is in order to be connected with described vehicle diagnosis seat, and gather vehicle diagnosis diagnostic trouble code, the then display screen display automobile diagnostic result of described multimeter; Described diagnostic result is described diagnostic trouble code; Diagnostic message corresponding for this diagnostic trouble code by after comparing with the standard failure code table being stored in a storer, then shows by described diagnostic trouble code;
Described digital multimeter is further comprising the steps of in use:
Step S01: described diagnose interface is connected with vehicle diagnosis seat;
Step S02: judge whether automobile ignition switch is opened, if opened, enter step S03;
Step S03: carry out protocol identification, reads car data.
2. there is a digital multimeter for automobile failure diagnosis function, it is characterized in that, comprising:
One MCU control module;
One multimeter measurement module, this multimeter measurement module is used for measuring the voltage received, electric current, resistance parameter, and measurement result is sent to described MCU control module;
One storer, this storer is connected with described MCU control module;
One driver module, it is connected to drive a display screen with described MCU control module;
One functional switch, an output terminal of this functional switch is connected with described MCU control module, to realize the switching between this multimeter test function;
At least two instrument connections, the signal of test is sent to described multimeter measurement module through described functional switch by described instrument connection; And
One diagnose interface, this diagnose interface in order to be connected with described vehicle diagnosis seat, and to be gathered vehicle diagnosis data and is connected with described MCU control module by an interface circuit; Described storer is used for store test data and automobile failure diagnosis table, and the data in storer upgrade by described diagnose interface;
Described multimeter measurement module converts measurement result to digital signal by its built-in A/D converter and sends to described MCU control module again;
Described diagnose interface is a Wireless Data Transmission interface;
Also comprise a multimeter housing; Described instrument connection, diagnose interface and display screen are embedded at the upper surface of this multimeter housing;
Also comprise a supervisory keyboard, described supervisory keyboard is in order to described MCU control module transmit operation instruction.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103076480B (en) * | 2012-12-30 | 2015-06-10 | 陕西海泰电子有限责任公司 | Tiny signal collecting card |
| CN103279120A (en) * | 2013-05-09 | 2013-09-04 | 三一矿机有限公司 | Portable data collection and diagnosis device and mechanical vehicle |
| CN103941136A (en) * | 2013-12-23 | 2014-07-23 | 上海大郡动力控制技术有限公司 | Signal sampling circuit resistor-capacitor component short circuit and open circuit fault diagnosis method |
| CN106814273B (en) * | 2017-03-31 | 2019-07-02 | 漳州市东方智能仪表有限公司 | A kind of automobile fault diagnostic apparatus |
| CN108199942B (en) * | 2018-01-08 | 2020-06-12 | 深圳市道通科技股份有限公司 | Automobile diagnosis method, device, equipment, system and diagnosis connecting equipment |
| CN110703736A (en) * | 2019-10-24 | 2020-01-17 | 深圳市道通科技股份有限公司 | Automobile diagnosis device, system and method |
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