CN102735896A - Digital universal meter with car failure diagnosis function and realization method thereof - Google Patents
Digital universal meter with car failure diagnosis function and realization method thereof Download PDFInfo
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- CN102735896A CN102735896A CN2012102427680A CN201210242768A CN102735896A CN 102735896 A CN102735896 A CN 102735896A CN 2012102427680 A CN2012102427680 A CN 2012102427680A CN 201210242768 A CN201210242768 A CN 201210242768A CN 102735896 A CN102735896 A CN 102735896A
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Abstract
The invention relates to a digital universal meter with car failure diagnosis function and a realization method thereof. The digital universal meter comprises a universal meter and is characterized in that a diagnosis interface is additionally arranged on the universal meter, and the diagnosis interface is connected with a car diagnosis pedestal and used for collecting the car diagnosis data, comparing the diagnosis data with the data stored in a storage device, finally displaying the comparison results through the displayer of the universal meter. Since the digital universal meter is added with the car failure diagnosis function, the digital universal meter provided by the invention not only can measure the electric parameters, such as voltage, current and resistance, but also can read the car failure codes, and can diagnose and analyze the car failures, so that the universal meter becomes a comprehensive test tool in car maintenance, great convenience is provided for the car maintenance personnel, and drivers can understand and find out the car failures in time.
Description
Technical field
The present invention relates to the 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 get into computer control period, each big automobile manufacturing enterprise such as the U.S., day, Europe begins to be equipped with OBD (OBD), OBD I, OBD II and OBD III have been experienced in the OBD system development.U.S. SAE has formulated the OBD II of unified diagnostic mode in the mid-90 in 20th century, makes OBD have unified standard, this fault diagnosis of giving automobile with detect maintenance and brought many convenience.
In OBD II system, the signal of Auto Electronic Controlled System occurs unusual and has exceeded normal variation range, and ECU is judged as fault, and monitor deposits the form of this fault with standard code in the inner fault memorizer of ECU in.Development along with OBD; The automobile electric control system structure is complicated more; Fault diagnosis is difficulty very, and automobile fault diagnostic apparatus is a very important instrument in the maintenance, and the user can utilize it promptly to read the fault in the automobile electric control system; And, find out the position and the reason that break down rapidly through LCDs demonstration failure message.
Multimeter is the basic tool of electronic surveying and maintenance, also is the irreplaceable important tool of motor vehicle electrician.Though multimeter can't read the vehicle failure sign indicating number; But can the various piece of conventional electrical system of automobile and Control System of Microcomputer be detected and measure; Circuit parameter, element function, working condition to these systems are analyzed and are tested, and judge and eliminating vehicle microcomputer control circuit fault.Select suitable annex, can also its test function be enlarged, directly physical quantitys such as the pressure on the automobile, vacuum, temperature are tested, this is very favourable to the fault of judging, analyze the vehicle microcomputer control system.
Along with the increase of China's automobile market recoverable amount, maintenance problem is more and more outstanding.And automotive electronic technology is universal day by day and progressive; Electrical control system structure is complicated; Make very difficulty of fault diagnosis, use separate diagnostic appearance also can only provide the direction of a failure judgement, is difficult to indicate particularly the parts or the position of a certain fault; Have only through multimeter and detect, just can find out the accurate position of fault.
Summary of the invention
For solving the existing defective of above-mentioned digital multimeter and automobile fault diagnostic apparatus, the purpose of this invention is to provide a kind of digital multimeter and its implementation with automobile failure diagnosis function, can realize a-table-multi-purpose, particularly make things convenient for the vehicle maintenance personnel to use.
The present invention adopts following scheme to realize said method: a kind of implementation method with digital multimeter of automobile failure diagnosis function; Comprise a multimeter is provided; It is characterized in that: on described multimeter, set up a diagnose interface; This diagnose interface is in order to being connected with said vehicle diagnosis seat, and gathers vehicle diagnosis data, the display screen display automobile diagnostic result of said multimeter then.
In an embodiment of the present invention, said digital multimeter is further comprising the steps of in use:
Step S01: said diagnose interface is connected with the vehicle diagnosis seat;
Step S02: judge whether automobile ignition switch is opened, if open then get into step S03;
Step S03: carry out agreement identification, read car data.
In an embodiment of the present invention, described diagnostic result is described DTC.
Described in an embodiment of the present invention DTC is through after comparing with the standard fault codes table that is stored in a storer, and again that this DTC is corresponding diagnostic message shows.
The present invention adopts following scheme to realize this digital multimeter: a kind of digital multimeter with automobile failure diagnosis function, it is characterized in that, and comprising:
One MCU control module;
One multimeter measurement module, this multimeter measurement module are used for the voltage, electric current, the resistance parameter that receive are measured, and measurement result sends to said MCU control module;
One storer, this storer is connected with described MCU control module;
One driver module, it is connected in order to drive a display screen with described MCU control module;
One functional switch, an output terminal of this functional switch is connected with said MCU control module, to realize the switching between this multimeter test function;
At least two instrument connections, said instrument connection sends to described multimeter measurement module through said functional switch with the signal of testing; And
One diagnose interface, this diagnose interface be in order to being connected with said vehicle diagnosis seat, and gather the vehicle diagnosis data and be connected with described MCU control module through an interface circuit.
In an embodiment of the present invention, described multimeter measurement module converts measurement result to digital signal through its built-in A/D converter and redispatches to said MCU control module.
In an embodiment of the present invention, also comprise a multimeter housing; 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 the storer can be upgraded through said diagnose interface.
In an embodiment of the present invention, also comprise a supervisory keyboard, described supervisory keyboard is in order to instruct to said MCU control module transmit operation.
The present invention is through increasing the automobile failure diagnosis function in digital multimeter; Not only can measuring voltage, electrical quantity such as electric current, resistance; Also can read the vehicle failure sign indicating number and then diagnostic analysis is carried out in vehicle failure; Make multimeter become the integration test instrument in the auto repair, greatly make things convenient for auto repair personnel and driver to the understanding of vehicle failure and search.
Description of drawings
Fig. 1 is an automobile failure diagnosis function implementation method process flow diagram in the digital multimeter of the embodiment of the invention.
Fig. 2 is the schematic block circuit diagram of the embodiment of the invention.
Fig. 3 is the shell mechanism synoptic diagram of the digital multimeter with automobile failure diagnosis function of the embodiment of the 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 accompanying drawing and embodiment the present invention is further specified.
Present embodiment provides a kind of implementation method with digital multimeter of automobile failure diagnosis function; Comprise a multimeter is provided; It is characterized in that: on described multimeter, set up a diagnose interface; This diagnose interface is in order to being connected with said vehicle diagnosis seat, and gathers vehicle diagnosis data, the display screen display automobile diagnostic result of said multimeter then.In use, at first, said diagnose interface is connected with the vehicle diagnosis seat; Secondly, judge whether automobile ignition switch is opened, if open then carry out agreement and discern, read car data, its process flow diagram can be referring to Fig. 1.What deserves to be mentioned is 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 DTC (DTC, SAE-J2012), standardized maintenance service information (SEA-J2000).The fixed a kind of communication protocol of no-go gage not in the OBD-II standard; But most widely used several kinds of agreements have been unified; Be respectively: CAN, ISO9141, KWP2000, SAEJ 1850 (PWM), SAEJ 1850 (VPW); Therefore, system then carries out reading of data after recognizing corresponding protocols.
In the present embodiment, above-mentioned diagnostic result can be a DTC, and display screen shows this failure code, and all with the English alphabet beginning, followed is with 4 numerals for this DTC DTC.As: P0101, C1234, B2236 or the like.The failure system that the letter representation of DTC beginning is monitored to: P is a power system; B is a bodywork system; C is a chassis system; U is network or data communication transmission system DTC.Wherein first digit is general code (to all vehicular manufacturer), or manufacturer's private code.Such as: 0 refers to general sign indicating number, and 1 refers to manufacturer's private code.General Motors Overseas Corporation with regard to helpful you diagnose technology state of vehicle specific numeric type coding.Second digit has been pointed out affected failure system type, and numeral is fuel oil and air metering system from 1-7:1; 2 are fuel oil and air metering system (it is bad to refer in particular to the spraying system return circuit); 3 is firing system or scarce cylinder monitoring system; 4 are auxiliary exhaust system; 5 are speed of a motor vehicle control and Wo 2009051153; 6 is computing machine outlet line system; 7 is wheel box.So corresponding diagnostic message of each DTC.In the present embodiment, we also can be stored in this diagnostic message (promptly diagnosing code table) in the storer, then through comparison, find the corresponding diagnostic message of said DTC, directly send described display screen to and show.
As shown in Figure 2, 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 are used for the voltage, electric current, the resistance parameter that receive are measured, and measurement result sends to said MCU control module; One storer, this storer is connected with described MCU control module; One driver module, it is connected in order to drive a display screen with described MCU control module; One functional switch, an output terminal of this functional switch is connected with said MCU control module, to realize the switching between this multimeter test function; At least two instrument connections, said instrument connection sends to described multimeter measurement module through said functional switch with the data of testing; And a diagnose interface, this diagnose interface is in order to being connected with said vehicle diagnosis seat, and gathers the vehicle diagnosis data and be connected with described MCU control module through an interface circuit.
Specifically; See also Fig. 3; Fig. 3 is this an enforcement shell mechanism synoptic diagram; Be embedded with instrument connection 6, functional switch 5, display screen 2, keyboard 3 and diagnose interface 4 among the figure on this shell 1, this diagnose interface 4 is used for being connected to read the information of the inner fault memorizer of automobile ECU with the vehicle diagnosis seat.This diagnose interface can be that socket passes through cable and is connected with the vehicle diagnosis seat, also can wave point, receive vehicle diagnosis seat wireless telecommunications system in succession.Be noted that this diagnose interface both can connect communication with ECU in the automobile, also can be connected, the vehicle diagnosis information of upgrading memory stores or the multimeter measurement result is transferred to PC with relevant device (like PC).This diagnose interface cooperates interface circuit as shown in Figure 1, and the automobile computer data-switching is to meet specification that the MCU control module requires and is to meet the specification (such as the signal level height) that automobile computer requires with the instruction transformation that MCU sends to automobile computer.
Please continue with reference to Fig. 2 and Fig. 3, in the present embodiment, instrument connection links to each other to detect external signal with the digital multimeter probe; Functional switch confirm digital multimeter measuring ability pattern: 1, in the time will realizing the multimeter test, functional switch places the dependence test setting with MCU, and tested voltage, electric current, resistance etc. are connected to the multimeter measurement module measure; 2, in the time will realizing automobile failure diagnosis, functional switch places the vehicle diagnosis function setting with MCU.Described multimeter measurement module carries out electric parameter measurements such as voltage, electric current, resistance, and in the present embodiment, this multimeter measurement module carries out digitized processing through the A/D converter in the module, and the measurement result conversion digital signal is transferred to the MCU control module.
In the present embodiment, said keyboard is to send the certain operations instruction to MCU, such as beginning the diagnosing protocol communication, transferring vehicle diagnosis information or upgrading diagnostic message according to DTC.Storer is some test datas of storage and automobile failure diagnosis table.Driver module is that MCU is passed the data conversion come for driving the signal of liquid crystal, and LCDs is to show measurement data, diagnostic message, associative operation information and interactive interface.
The foregoing description only supplies to explain the present invention's usefulness, and those skilled in the art are under the situation that does not break away from the spirit and scope of the present invention; Can also make various conversion or variation; Therefore, all technical schemes that are equal to also should belong to category of the present invention, are limited each claim.
Claims (10)
1. implementation method with digital multimeter of automobile failure diagnosis function; Comprise a multimeter is provided; It is characterized in that: on described multimeter, set up a diagnose interface; This diagnose interface is in order to being connected with said vehicle diagnosis seat, and gathers vehicle diagnosis DTC, the display screen display automobile diagnostic result of said multimeter then.
2. the digital multimeter with automobile failure diagnosis function according to claim 1 is characterized in that: said digital multimeter is further comprising the steps of in use:
Step S01: said diagnose interface is connected with the vehicle diagnosis seat;
Step S02: judge whether automobile ignition switch is opened, if open then get into step S03;
Step S03: carry out agreement identification, read car data.
3. the digital multimeter with automobile failure diagnosis function according to claim 1 is characterized in that: described diagnostic result is described DTC.
4. the digital multimeter with automobile failure diagnosis function according to claim 1 is characterized in that: described DTC is through after comparing with the standard fault codes table that is stored in a storer, and again that this DTC is corresponding diagnostic message shows.
5. the digital multimeter with automobile failure diagnosis function is characterized in that, comprising:
One MCU control module;
One multimeter measurement module, this multimeter measurement module are used for the voltage, electric current, the resistance parameter that receive are measured, and measurement result sends to said MCU control module;
One storer, this storer is connected with described MCU control module;
One driver module, it is connected in order to drive a display screen with described MCU control module;
One functional switch, an output terminal of this functional switch is connected with said MCU control module, to realize the switching between this multimeter test function;
At least two instrument connections, said instrument connection sends to described multimeter measurement module through said functional switch with the signal of testing; And
One diagnose interface, this diagnose interface be in order to being connected with said vehicle diagnosis seat, and gather the vehicle diagnosis data and be connected with described MCU control module through an interface circuit.
6. the digital multimeter with automobile failure diagnosis function according to claim 5 is characterized in that: described multimeter measurement module converts measurement result to digital signal through its built-in A/D converter and redispatches to said MCU control module.
7. the digital multimeter with automobile failure diagnosis function according to claim 5 is characterized in that: also comprise a multimeter housing; Described instrument connection, diagnose interface and LCDs are embedded at the upper surface of this multimeter housing.
8. the digital multimeter with automobile failure diagnosis function according to claim 5 is characterized in that: described diagnose interface is a wireless data transmission interface.
9. the digital multimeter with automobile failure diagnosis function according to claim 5 is characterized in that: described storer is used for store test data and automobile failure diagnosis table, and the data in the storer can be upgraded through said diagnose interface.
10. the digital multimeter with automobile failure diagnosis function according to claim 5 is characterized in that: also comprise a supervisory keyboard, described supervisory keyboard is in order to instruct to said MCU control module transmit operation.
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| CN103076480A (en) * | 2012-12-30 | 2013-05-01 | 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 |
| CN106814273A (en) * | 2017-03-31 | 2017-06-09 | 漳州市东方智能仪表有限公司 | A kind of automobile fault diagnostic apparatus |
| CN111552274A (en) * | 2018-01-08 | 2020-08-18 | 深圳市道通科技股份有限公司 | Automobile diagnosis method, device, equipment, system and diagnosis connecting equipment |
| WO2021078047A1 (en) * | 2019-10-24 | 2021-04-29 | 深圳市道通科技股份有限公司 | Automobile diagnosis device, system and method |
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| 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 |
| CN106814273A (en) * | 2017-03-31 | 2017-06-09 | 漳州市东方智能仪表有限公司 | A kind of automobile fault diagnostic apparatus |
| 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 |
| CN111552274A (en) * | 2018-01-08 | 2020-08-18 | 深圳市道通科技股份有限公司 | Automobile diagnosis method, device, equipment, system and diagnosis connecting equipment |
| WO2021078047A1 (en) * | 2019-10-24 | 2021-04-29 | 深圳市道通科技股份有限公司 | Automobile diagnosis device, system and method |
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