CN202693655U - Digital multimeter with automotive fault diagnosis function - Google Patents
Digital multimeter with automotive fault diagnosis function Download PDFInfo
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- CN202693655U CN202693655U CN 201220339816 CN201220339816U CN202693655U CN 202693655 U CN202693655 U CN 202693655U CN 201220339816 CN201220339816 CN 201220339816 CN 201220339816 U CN201220339816 U CN 201220339816U CN 202693655 U CN202693655 U CN 202693655U
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- multimeter
- control module
- mcu control
- automotive
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Abstract
The utility model relates to a digital multimeter with an automotive fault diagnosis function and an implementation method thereof. The digital multimeter comprises a multimeter and is characterized in that the multimeter is additionally provided with a diagnosis interface, the diagnosis interface is used for being connected with an automotive diagnosis seat and acquiring automotive diagnosis data, and then, a display screen of the multimeter displays an automotive diagnosis result. According to the digital multimeter with the automotive fault diagnosis function, the digital multimeter additionally has the automotive fault diagnosis function, not only can electrical parameters, such as voltage, current and resistance, be measured, but also automotive fault codes can be read, and then, automotive faults are subjected to diagnostic analysis, so that the multimeter becomes a comprehensive testing tool in automobile maintenance, and the understanding and finding of the automotive faults by automobile maintenance personnel and drivers are greatly facilitated.
Description
Technical field
The utility model relates to the digital multimeter technical field, particularly a kind of digital multimeter with automobile failure diagnosis function.
Background technology
As far back as the eighties in last century automobile enter computer control period, each large automobile manufacturing enterprise such as the U.S., day, Europe begins to be equipped with OBD (OBD), the OBD System Development has experienced 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 gives fault diagnosis of automobile and detects 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 fault memorizer of ECU inside in.Development along with OBD, the automobile electric control system structure is more complicated, fault diagnosis is very difficult, automobile fault diagnostic apparatus is very important instrument in the maintenance, the user can utilize it promptly to read fault in the automobile electric control system, and by LCDs demonstration failure message, find out rapidly the position and the reason that break down.
Multimeter is the basic tool of electronic surveying and maintenance, also is the irreplaceable important tool of motor vehicle electrician.Although multimeter can't read automobile fault code, but can the various piece of the 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, its test function can also be enlarged, directly the 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 day by day universal and progressive, electrical control system structure is complicated, make fault diagnosis very difficult, use the separate diagnostic instrument that the direction of a failure judgement also can only be provided, be difficult to indicate particularly parts or the position of a certain fault, only have by multimeter and detect, just can look for out of order accurate position.
Summary of the invention
For solving the existing defective of above-mentioned digital multimeter and automobile fault diagnostic apparatus, the purpose of this utility model provides 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 librarian use.
The utility model 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 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, described instrument connection sends to described multimeter measurement module through described functional switch with the signal of testing; And
One diagnose interface, this diagnose interface be in order to being connected with described vehicle diagnosis seat, and gather the vehicle diagnosis data communication device and cross an interface circuit and be connected with described MCU control module.
In the utility model one embodiment, 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 the utility model one embodiment, also comprise a multimeter housing; Described instrument connection, diagnose interface and LCDs are embedded at the upper surface of this multimeter housing.
In the utility model one embodiment, described diagnose interface is a Wireless Data Transmission interface.
In the utility model one embodiment, also comprise a supervisory keyboard, described supervisory keyboard is in order to described MCU control module transmit operation instruction.
The utility model is by increasing the automobile failure diagnosis function in digital multimeter, not only can measuring voltage, the electrical quantity such as electric current, resistance, also can read automobile fault code and then diagnostic analysis is carried out in vehicle failure, make multimeter become 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 the schematic block circuit diagram of the utility model embodiment.
Fig. 2 is the shell mechanism signal of the digital multimeter with automobile failure diagnosis function of the utility model embodiment
Figure.
Fig. 3 is automobile failure diagnosis function realizing method process flow diagram in the digital multimeter of the utility model embodiment.
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 utility model is described further.
As shown in Figure 1, 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 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, described instrument connection sends to described multimeter measurement module through described functional switch with the data of testing; And a diagnose interface, this diagnose interface is in order to being connected with described vehicle diagnosis seat, and gathers the vehicle diagnosis data communication device and cross an interface circuit and be connected with described MCU control module.
Specifically, see also Fig. 2, Fig. 3 is this 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 with the vehicle diagnosis seat reading the information of the fault memorizer of automobile ECU inside.This diagnose interface can be that socket is connected with the vehicle diagnosis seat by cable, also can wave point, receive in succession vehicle diagnosis seat wireless telecommunications system.Be noted that this diagnose interface both can also can be connected with relevant device (such as PC) with ECU connecting communication in the automobile, the vehicle diagnosis information of upgrading memory stores or the multimeter measurement result is transferred to PC.This diagnose interface cooperates interface circuit as shown in Figure 1, the automobile computer data is converted to meet specification that the MCU control module requires and be 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 to see figures.1.and.2, in the present embodiment, instrument connection links to each other to detect external signal with the digital multimeter probe; Functional switch determine to be determined 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 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 the module, and the measurement result conversion digital signal is transferred to the MCU control module.
In the present embodiment, described 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 diagnostic trouble code.Storer is some test datas of storage and automobile failure diagnosis table.Driver module is MCU to be passed the data of coming be converted into the signal that drives liquid crystal, and LCDs is display measurement data, diagnostic message, associative operation information and interactive interface.
In order to allow those skilled in the art better understand framework of the present utility model, realize that below in conjunction with the utility model principle is described further.
The utility model is to set up a diagnose interface at a multimeter, and this diagnose interface is in order to being connected with described vehicle diagnosis seat, and gathers vehicle diagnosis data, then the display screen display automobile diagnostic result of described multimeter.In use, at first, described diagnose interface is connected with the vehicle diagnosis seat; Secondly, judge whether automobile ignition switch is opened, if open then carry out protocol identification, read car data, its process flow diagram can be referring to Fig. 3.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).The fixed a kind of communication protocol of no-go gage not in the OBD-II standard, but unified most widely used several agreement, be respectively: CAN, ISO9141, KWP2000, SAEJ 1850(PWM), SAEJ 1850(VPW), therefore, system then carries out reading of data after recognizing corresponding agreement.
In the present embodiment, above-mentioned diagnostic result can be a diagnostic trouble code, and display screen shows this failure code, and all with the English alphabet beginning, 4 numerals are followed in the back to this diagnostic trouble code DTC.As: P0101, C1234, B2236 etc.The failure system that the letter representation of DTC beginning 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 (to all vehicular manufacturer), or manufacturer's private code.Such as: the general code of 0 finger, 1 finger manufacturer 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 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 the computer export line system; 7 is wheel box.So corresponding diagnostic message of each diagnostic trouble code.In the present embodiment, we also can be stored in this diagnostic message (namely diagnosing code table) in the storer, then by comparison, find diagnostic message corresponding to described diagnostic trouble code, directly send described display screen to and show.
Above-described embodiment is only for illustration of the utility model, those skilled in the art, in the situation that does not break away from spirit and scope of the present utility model, can also make various conversion or variation, therefore, all technical schemes that are equal to also should belong to category of the present utility model, are limited by each claim.
Claims (5)
1. 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 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, described instrument connection sends to described multimeter measurement module through described functional switch with the signal of testing; And
One diagnose interface, this diagnose interface be in order to being connected with described vehicle diagnosis seat, and gather the vehicle diagnosis data communication device and cross an interface circuit and be connected with described MCU control module.
2. the digital multimeter with automobile failure diagnosis function according to claim 1, it is characterized in that: 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.
3. the digital multimeter with automobile failure diagnosis function according to claim 1 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.
4. the digital multimeter with automobile failure diagnosis function according to claim 1, it is characterized in that: described diagnose interface is a Wireless Data Transmission interface.
5. the digital multimeter with automobile failure diagnosis function according to claim 1 is characterized in that: also comprise a supervisory keyboard, described supervisory keyboard is in order to described MCU control module transmit operation instruction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220339816 CN202693655U (en) | 2012-07-14 | 2012-07-14 | Digital multimeter with automotive fault diagnosis function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220339816 CN202693655U (en) | 2012-07-14 | 2012-07-14 | Digital multimeter with automotive fault diagnosis function |
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| CN202693655U true CN202693655U (en) | 2013-01-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735896A (en) * | 2012-07-14 | 2012-10-17 | 漳州市东方智能仪表有限公司 | Digital universal meter with car failure diagnosis function and realization method thereof |
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2012
- 2012-07-14 CN CN 201220339816 patent/CN202693655U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735896A (en) * | 2012-07-14 | 2012-10-17 | 漳州市东方智能仪表有限公司 | Digital universal meter with car failure diagnosis function and realization method thereof |
| CN102735896B (en) * | 2012-07-14 | 2015-08-26 | 漳州市东方智能仪表有限公司 | A kind of digital multimeter and its implementation with automobile failure diagnosis function |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20140714 |
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| EXPY | Termination of patent right or utility model |