CN114489012A - OBD diagnosis method and system based on instrument implementation - Google Patents
OBD diagnosis method and system based on instrument implementation Download PDFInfo
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- CN114489012A CN114489012A CN202210094292.4A CN202210094292A CN114489012A CN 114489012 A CN114489012 A CN 114489012A CN 202210094292 A CN202210094292 A CN 202210094292A CN 114489012 A CN114489012 A CN 114489012A
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- 238000004891 communication Methods 0.000 claims abstract description 33
- 230000005540 biological transmission Effects 0.000 claims description 12
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
- G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols
Abstract
The invention belongs to the technical field of vehicle diagnosis, and particularly relates to an OBD diagnosis method and system based on an instrument, wherein the method comprises the following steps: the instrument and the diagnostic equipment are connected in a bus communication mode through an OBD (on-board diagnostics) interface, and meanwhile, the instrument and other electric control units of the vehicle are connected in various communication modes (bus or non-bus); after receiving a diagnosis request initiated by the diagnosis equipment, the instrument acquires diagnosis response data in a communication mode with other electronic control units, converts the data into a response data packet consistent with a diagnosis equipment request protocol, and then returns the response data packet to the diagnosis equipment; the diagnostic device runs the fault identification operation according to the received response data packet to generate a diagnostic operation result. By connecting the instrument with all the electronic control units of the vehicle, the invention can solve the problem of OBD diagnosis when the vehicle does not have bus OBD diagnosis capability.
Description
Technical Field
The invention belongs to the technical field of vehicle diagnosis, and particularly relates to an OBD diagnosis method and system based on an instrument.
Background
The OBD diagnosis also calls a vehicle automatic diagnosis system, the system mainly monitors whether the tail gas of the vehicle exceeds the standard or whether the system has a fault at any time from the running condition of an engine, a warning is sent out when the tail gas exceeds the standard, a fault lamp is on when the system has the fault, meanwhile, a control module stores fault information into a memory, and a fault code is led out from the control module through a certain program; the maintenance personnel can quickly and accurately determine the nature and the position of the fault according to the fault code.
The existing OBD diagnostic system comprises an OBD diagnostic interface which is connected with each Electronic Control Unit (ECU) of the automobile through the OBD diagnostic interface, and when the automobile breaks down, parameters of the ECU are read so as to diagnose the faults of the ECU, but the OBD diagnostic interface comprises sixteen bus interfaces, nine bus interface protocols developed at present have, all nine interfaces have fixed communication protocols, the connection between the electronic control unit and the OBD diagnostic interface has a fixed corresponding relation, and when fault diagnosis is carried out, because of the limitation of the communication protocols, diagnosis is often inconvenient, for example, the OBD diagnostic protocols used by the vehicles in the market at present comprise diagnostic protocols such as ISO15765, SAEJ1939 and the like, most OBD diagnostic equipment in the market only has good support degree to ISO15765, the support degree to other diagnostic protocols such as SAEJ1939 and the like is incomplete or not supported, and an electronic control unit which is not suitable for ISO15765 exists, therefore, a problem that the OBD diagnosis cannot be realized due to the fact that a certain electric control unit of the vehicle does not have the bus OBD diagnosis capability frequently occurs, a new bus interface needs to be developed, and the cost is high.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an OBD diagnosis method and system based on an instrument, which are used for solving the problem of communication protocol limitation in the existing OBD diagnosis technology.
The invention provides a basic scheme I: an on-board diagnostics (OBD) method implemented based on a meter, comprising:
the instrument and the diagnostic equipment are in communication connection in a bus mode through an OBD (on-board diagnostics) interface, and the instrument and the vehicle electric control unit are connected through a bus or a non-bus;
the diagnostic equipment initiates a diagnostic request to the instrument through the OBD diagnostic interface, and the instrument receives the diagnostic request and then acquires diagnostic response data from the electronic control unit;
the instrument converts the acquired diagnosis response data into a return response data packet consistent with the request protocol of the diagnosis equipment and returns the return response data packet to the diagnosis equipment;
the diagnostic device executes a fault recognition operation based on the return response packet and generates a diagnostic operation result.
The principle and the advantages of the first basic scheme provided by the invention are as follows: in the prior art, the diagnostic device is connected with an OBD diagnostic interface of a vehicle to read parameters of an electronic control unit, so as to perform fault identification, and the communication protocol is fixed, so that the diagnosis is inconvenient due to the limitation of the communication protocol during the diagnosis, and a problem that the OBD diagnosis cannot be realized due to the fact that a certain electronic control unit of the vehicle does not have the bus OBD diagnostic capability often occurs, so that a new bus interface needs to be developed, and the cost is high.
Therefore, in order to solve the related problems in the prior art, firstly, the instrument and the diagnostic equipment are connected in a certain bus communication mode through an OBD (on-board diagnostics) interface, and meanwhile, the instrument and other electronic control units of the vehicle are connected in multiple communication modes (bus or non-bus); after receiving a diagnosis request initiated by the diagnosis equipment, the instrument acquires diagnosis response data in a communication mode with other electronic control units, converts the data into a response data packet consistent with a diagnosis equipment request protocol, and then returns the response data packet to the diagnosis equipment; the diagnostic equipment runs fault identification operation according to the received response data packet to generate a diagnostic operation result; in addition, the instrument is used as a necessary device of the vehicle, and the instrument is connected with part of electric control units in the vehicle and plays a role in displaying the faults of the part of the electric control units.
Therefore, the invention has the advantages that: (1) the instrument is connected with each electric control unit in the vehicle, and the instrument and the diagnostic equipment can be connected with the same bus interface through the OBD diagnostic interface, so that a service diagnosis request protocol of the diagnostic equipment is converted to be consistent with a service diagnosis protocol of the electric control unit, and the problem of communication limitation in the OBD diagnostic technology is solved; (2) the communication limitation in the OBD diagnosis technology of the vehicle is solved through the instrument, the instrument belongs to essential equipment of the vehicle, on one hand, the instrument is also connected with other electric control units and plays a role in displaying the faults of the electric control units; on the other hand, an additional switching port or switching equipment is not required to be installed, so that the applicability is high, and the installation cost is saved; (3) the instrument and the OBD diagnosis interface are both positioned at the front end of the vehicle, so that the use is convenient; (4) the instrument is connected with other electric control units in the vehicle, and then the instrument is connected with other electric control units in the vehicle, so that an OBD diagnosis function is provided for other electric control units without the OBD diagnosis function, and an OBD diagnosis interface agent function with low cost is provided.
Further, the diagnostic response data comprises real-time fault data, historical fault data and fault freeze frame data.
Has the advantages that: the real-time fault data is a section of data from no fault to fault of an instrument acquisition electric control unit, the historical fault data is data of the electric control unit when the electric control unit has a historical fault and is used for making reference for fault diagnosis, the fault freezing frame data is frame data frozen when the electric control unit has a fault, and the frame data comprises information such as the reason of the fault.
Further, the diagnostic device initiates a diagnostic request to the instrument through the OBD diagnostic interface, and the acquisition of diagnostic response data to the electronic control unit after the instrument receives the diagnostic request further includes:
and the meter runs fault identification operation according to the read diagnosis response data and generates a meter operation result.
Has the advantages that: the instrument is used as a necessary device of the vehicle, has stronger calculation and storage capacity compared with an electric control unit, can perform a fault diagnosis function under the condition that no diagnosis device exists, and can store a certain amount of diagnosis historical data of the electric control unit, thereby being beneficial to finding out a fault generation process and being convenient for finding out fault reasons.
Further, still include:
feeding back an instrument operation result and a diagnosis operation result to a user side to obtain a user solution and a fault solution;
and (4) performing fault identification operation on the instrument for the second time to generate a secondary instrument operation result, and if the fault in the secondary instrument operation result is solved, generating a fault log record.
Has the advantages that: the user side can be used for a user to make a solution for a diagnosis result, meanwhile, the computing power of the instrument can provide a verification function when the user solves a problem, the instrument can also generate a fault log record after the fault problem is solved, and the fault log record can be used as historical fault data.
The invention provides a second basic scheme: an OBD diagnosis system realized based on an instrument comprises the instrument, an OBD diagnosis interface and a diagnosis device, the meter and the diagnostic equipment are in communication connection in a bus mode through an OBD diagnostic interface, the meter and the vehicle electric control unit are connected through a bus or a non-bus, the diagnostic device is used for sending a diagnostic request protocol to a meter through an OBD diagnostic interface, the meter comprises a data acquisition module, a protocol conversion module, a transmission module and a control module, the data acquisition module, the protocol conversion module and the transmission module are all electrically connected with the controller, the data acquisition module is used for receiving the diagnosis request and then acquiring the diagnosis response data from the electronic control unit, the protocol conversion module is used for converting the acquired diagnosis response data into a return response data packet consistent with the diagnosis equipment request protocol, the control module is used for controlling the transmission module to transmit the return response data packet to the diagnostic equipment; the diagnostic equipment is also used for running fault identification operation according to the return response data packet and generating a diagnostic operation result.
The principle and the advantages of the basic scheme II provided by the invention are as follows: in the prior art, the diagnostic device is connected with an OBD diagnostic interface of a vehicle to read parameters of an electronic control unit, so as to perform fault identification, and the communication protocol is fixed, so that the diagnosis is inconvenient due to the limitation of the communication protocol during the diagnosis, and a problem that the OBD diagnosis cannot be realized due to the fact that a certain electronic control unit of the vehicle does not have the bus OBD diagnostic capability often occurs, so that a new bus interface needs to be developed, and the cost is high.
Therefore, in order to solve the related problems in the prior art, firstly, the instrument and the diagnostic equipment are connected in a certain bus communication mode through an OBD (on-board diagnostics) interface, and meanwhile, the instrument and other electronic control units of the vehicle are connected in multiple communication modes (bus or non-bus); after receiving a diagnosis request initiated by the diagnosis equipment, the instrument acquires diagnosis response data of other electronic control units through the data acquisition module, converts the data into response data packets consistent with the request protocol of the diagnosis equipment through the protocol conversion module, and then controls the transmission module to return the response data packets to the diagnosis equipment through the control module; the diagnostic equipment runs fault identification operation according to the received response data packet to generate a diagnostic operation result; in addition, the instrument is used as a necessary device of the vehicle, and the instrument is connected with part of electric control units in the vehicle and plays a role in displaying the faults of the part of the electric control units.
Therefore, the invention has the advantages that: (1) the instrument is connected with each electric control unit in the vehicle, and the instrument and the diagnostic equipment can be connected with the same bus interface through the OBD diagnostic interface, so that a service diagnosis request protocol of the diagnostic equipment is converted to be consistent with a service diagnosis protocol of the electric control unit, and the problem of communication limitation in the OBD diagnostic technology is solved; 2) the communication limitation in the OBD diagnosis technology of the vehicle is solved through the instrument, the instrument belongs to essential equipment of the vehicle, on one hand, the instrument is also connected with other electric control units and plays a role in displaying the faults of the electric control units; on the other hand, an additional switching port or switching equipment is not required to be installed, so that the applicability is high, and the installation cost is saved; (3) the instrument and the OBD diagnosis interface are both positioned at the front end of the vehicle, so that the use is convenient; (4) the instrument is connected with other electric control units in the vehicle, and then the instrument is connected with other electric control units in the vehicle, so that an OBD diagnosis function is provided for other electric control units without the OBD diagnosis function, and an OBD diagnosis interface agent function with low cost is provided.
Further, the diagnostic response data comprises real-time fault data, historical fault data and fault freeze frame data.
Has the advantages that: the real-time fault data is a section of data from no fault to fault of an instrument acquisition electric control unit, the historical fault data is data of the electric control unit when the electric control unit has a historical fault and is used for making reference for fault diagnosis, the fault freezing frame data is frame data frozen when the electric control unit has a fault, and the frame data comprises information such as the reason of the fault.
Further, the instrument further comprises a fault identification module, the fault identification module is electrically connected with the control module, and the fault identification module is used for operating fault identification operation according to the acquired diagnosis response data and generating an instrument operation result.
Has the advantages that: the instrument is used as a necessary device of the vehicle, has stronger calculation and storage capacity compared with an electric control unit, can perform a fault diagnosis function under the condition that no diagnosis device exists through the fault identification module, can display a fault diagnosis result, and can also display a fault troubleshooting means, a suggested solution and the like of a manufacturer when a fault occurs according to the fault diagnosis result.
The system comprises a meter, a diagnostic device and a fault recognition module, wherein the meter is used for carrying out fault recognition operation on the meter, the fault recognition module is used for carrying out fault recognition operation on the meter after a fault is solved, and generating a fault log record if the fault in the secondary meter operation result is solved.
Has the advantages that: the user side can be used for a user to make a solution for a diagnosis result, meanwhile, the fault identification module of the instrument can provide a verification function when the user solves a problem, the recording module in the instrument can also generate a fault log record after the fault problem is solved, and the fault log record can be used as historical fault data.
Drawings
FIG. 1 is a block flow diagram of an embodiment of the present invention;
FIG. 2 is a functional block diagram of an embodiment of the present invention;
FIG. 3 is a block diagram of an implementation process of an embodiment of the present invention;
FIG. 4 is a functional block diagram of an example one of the embodiments of the present invention;
FIG. 5 is a block diagram of an implementation process of an example I according to an embodiment of the present invention;
FIG. 6 is a functional block diagram of example two of the present invention;
FIG. 7 is a block diagram of an implementation process of example two in an embodiment of the present invention;
FIG. 8 is a functional block diagram of a meter system in an embodiment of the invention.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention, while a logical order is shown in the embodiments, in some cases steps shown or described may be performed in an order different than that shown.
The following is further detailed by way of specific embodiments:
the embodiment is substantially as shown in fig. 1, 2 and 3: an on-board diagnostics (OBD) method implemented based on a meter, comprising:
the method comprises the following steps: the instrument and the diagnostic equipment are in communication connection in a bus mode through an OBD (on-board diagnostics) interface, and the instrument and the vehicle electronic control unit are connected through a bus or a non-bus.
In this embodiment, the meter is connected to the OBD diagnostic interface of the vehicle through a communication method such as, but not limited to, a CAN bus, Klinezon, Ethernet, etc., the diagnostic device is connected to the OBD diagnostic interface through a predetermined diagnostic protocol, for example, the diagnostic protocol of the CAN bus, and in this embodiment, the meter is connected to various electronic control units requiring OBD diagnosis, such as an engine, a motor, a transmission, and a BMS of the vehicle, through a bus connection method, so as to acquire information such as states and values of the respective electronic control units.
Step two: the diagnostic equipment initiates a diagnostic request to the instrument through the OBD diagnostic interface, and the instrument receives the diagnostic request and then acquires diagnostic response data from the electronic control unit.
The diagnosis response data comprises real-time fault data, historical fault data and fault freezing frame data.
Step three: and the meter converts the acquired diagnosis response data into a return response data packet in accordance with the request protocol of the diagnosis equipment and returns the return response data packet to the diagnosis equipment.
In this embodiment, the diagnostic device sends a diagnostic request protocol to the meter through the OBD diagnostic interface, as shown in fig. 4 and 5 as an example: the method comprises the steps that diagnostic equipment reads a current DTC (service diagnosis request) fault code of an engine, the diagnostic equipment is connected with an OBD diagnosis interface through a CAN bus, a meter is also connected with the OBD diagnosis interface through the CAN bus, the meter is also connected with an engine ECU (electronic control unit) through a Kline bus, the diagnostic equipment initiates a service diagnosis request based on ISO15031 through the CAN, wherein the diagnosis request address of the engine ECU is mapped to 0x700 on the OBD, the response address is 0x708, and after the meter receives the diagnosis request, the meter initiates a request for establishing communication based on ISO14230 to the engine ECU through Kline; after the communication between the meter and the engine ECU is successfully established, namely after the unlocking is successful, the meter initiates a service request based on ISO14230 to the engine ECU, wherein the physical address of the engine ECU is 0x80, the meter acquires the diagnosis response data of the engine ECU, analyzes and converts the diagnosis response data into returned diagnosis response data of ISO15031 transmitted back to the diagnosis equipment, and finally the meter transmits the converted returned diagnosis response data of the engine ECU back to the diagnosis instrument through the CAN bus.
In the above embodiment, examples of protocol conversion and transmission by Kline are listed, and in order to embody multi-protocol conversion, in other embodiments of this embodiment, a second example shown in fig. 6 and fig. 7 is further included: the diagnostic equipment reads the current rotating speed of the motor, and initiates a service diagnosis request based on ISO14229 through the CAN bus, wherein the address of the motor diagnosis request is mapped to 0x710 on the OBD, and the response address is 0x 718; after the instrument receives the diagnosis request, capturing a frequency signal sent by the motor through a PWM waveform; after the instrument acquires the motor frequency signal, the motor frequency signal is analyzed and converted into the motor rotating speed, then the motor rotating speed is converted into returned diagnosis response data of ISO14229 returned to the diagnosis equipment, and finally the instrument returns the converted ISO14229 returned diagnosis response data to the diagnosis equipment through the CAN bus.
In the two examples, the diagnostic response data acquired by the meter includes real-time fault data, historical fault data and fault freezing frame data, where the real-time fault data is a section of data of the meter collecting electronic control unit from no fault to fault, the historical fault data is data of the electronic control unit when a fault occurs in history and is used as a reference for the current fault diagnosis, and the fault freezing frame data is frame data frozen when the electronic control unit generates a fault, and the frame data includes information such as a cause of the fault.
In the second step, the method further comprises the following steps: and the instrument runs fault identification operation according to the acquired diagnosis response data and generates an instrument operation result.
In this embodiment, a fault recognition module and a storage module are arranged in the instrument, the fault recognition module is used for performing fault recognition and analysis on a received fault code of the electronic control unit ECU, and running fault recognition operation, so that an instrument operation result is generated, the instrument has high calculation capability through the fault recognition module, the generated instrument operation result is stored in the storage module, and meanwhile, the instrument can be connected with each electronic control unit in the vehicle through a bus.
In addition, when the existing diagnostic protocol or diagnostic standard changes, the meter further comprises a wireless communication module, and a user can be in wireless communication connection with the meter through the mobile terminal, so that firmware or software of the meter is updated, the meter can be compatible with new standards and protocols, wherein the wireless communication module comprises a bluetooth module, a WIFI module, a 4G module and a 5G module, and the bluetooth module is used in the embodiment.
Step four: the diagnostic equipment runs fault identification operation according to the return package to generate a diagnostic operation result;
step five: and feeding back the operation result and the diagnosis operation result of the instrument to the user side to obtain a user solution and a fault solution.
In this embodiment, the diagnostic device receives the return packet transmitted back by the meter, further reads and analyzes data in the return packet, generates a diagnostic operation result, and further transmits the diagnostic operation result and the meter diagnostic result to the user side for the user to solve the problem.
Step six: and (4) performing fault identification operation on the instrument for the second time to generate a secondary instrument operation result, and if the fault in the secondary instrument operation result is solved, generating a fault log record.
In this embodiment, the fault identification module in the meter is further configured to provide a verification function when the fault is resolved, that is, the fault identification module of the meter performs fault identification operation for the second time to verify whether the fault still exists, and if the fault is resolved in the verification result, the meter generates a fault log record for the current fault, which can be used as fault history data, and can also facilitate the user to check the history fault data.
In addition, in another technical solution of the present invention, an OBD diagnostic system implemented based on a meter is further included, as shown in fig. 2 and fig. 8, the system includes a meter, an OBD diagnostic interface and a diagnostic device, the meter and the diagnostic device are in communication connection in a bus mode through the OBD diagnostic interface, the meter and a vehicle electronic control unit are connected through a bus or a non-bus, and in this embodiment, the meter and the vehicle electronic control unit are connected through a bus; the diagnostic equipment is used for sending a diagnostic request protocol to the instrument through the OBD diagnostic interface.
The instrument comprises a data acquisition module, a protocol conversion module, a transmission module, a fault diagnosis module and a control module, wherein the data acquisition module, the protocol conversion module, the transmission module and the fault diagnosis module are all electrically connected with the controller, the data acquisition module is used for acquiring diagnosis response data after receiving a diagnosis request to the electronic control unit, the protocol conversion module is used for converting the acquired diagnosis response data into a return response data packet consistent with a request protocol of the diagnosis equipment, and the control module is used for controlling the transmission module to transmit the return response data packet to the diagnosis equipment; the fault identification module is used for operating fault identification operation according to the acquired diagnosis response data and generating an instrument operation result; the diagnostic equipment is also used for running fault identification operation according to the return response data packet and generating a diagnostic operation result.
The diagnosis response data comprises real-time fault data, historical fault data and fault freezing frame data, wherein the real-time fault data is a section of data from failure to failure of the electric control unit collected by the instrument, the historical fault data is data from failure of the electric control unit in history and is used for making reference for the current fault diagnosis, the fault freezing frame data is frame data frozen when the electric control unit fails, and the frame data contains information such as reasons of failure.
The system comprises a user side, the user side is in communication connection with the instrument and the diagnosis equipment, the instrument further comprises a recording module, the user side is used for receiving an instrument operation result and a diagnosis operation result and generating a user solution, the fault identification module is further used for performing secondary operation fault identification operation after the fault is solved and generating a secondary instrument operation result, and if the fault in the secondary instrument operation result is solved, the recording module generates a fault log record.
The foregoing are merely exemplary embodiments of the present invention, and no attempt is made to show structural details of the invention in more detail than is necessary for the fundamental understanding of the art, the description taken with the drawings making apparent to those skilled in the art how the several forms of the invention may be embodied in practice with the teachings of the invention. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (8)
1. An OBD diagnosis method realized based on an instrument is characterized in that: the method comprises the following steps:
the instrument and the diagnostic equipment are in communication connection in a bus mode through an OBD (on-board diagnostics) interface, and the instrument and the vehicle electric control unit are connected through a bus or a non-bus;
the diagnostic equipment initiates a diagnostic request to the instrument through the OBD diagnostic interface, and the instrument receives the diagnostic request and then acquires diagnostic response data from the electronic control unit;
the instrument converts the acquired diagnosis response data into a return response data packet consistent with the request protocol of the diagnosis equipment and returns the return response data packet to the diagnosis equipment;
the diagnostic device executes a fault recognition operation based on the return response packet and generates a diagnostic operation result.
2. The meter-based implementation of the OBD diagnostic method according to claim 1, characterized in that: the diagnostic response data includes real-time fault data, historical fault data, and fault freeze frame data.
3. The meter-based implementation of the OBD diagnostic method according to claim 1, characterized in that: the diagnostic equipment initiates a diagnosis request to the instrument through the OBD diagnosis interface, and the acquisition of diagnosis response data to the electronic control unit after the instrument receives the diagnosis request further comprises:
and the meter runs fault identification operation according to the read diagnosis response data and generates a meter operation result.
4. The meter-based implementation of the OBD diagnostic method according to claim 3, characterized in that: further comprising:
feeding back an instrument operation result and a diagnosis operation result to a user side to obtain a user solution and a fault solution;
and (4) performing fault identification operation on the instrument for the second time to generate a secondary instrument operation result, and if the fault in the secondary instrument operation result is solved, generating a fault log record.
5. An OBD diagnostic system based on instrument implementation, characterized in that: comprises a meter, an OBD diagnosis interface and a diagnosis device, wherein the meter and the diagnosis device are in communication connection in a bus mode through the OBD diagnosis interface, the instrument is connected with the vehicle electric control unit through a bus or a non-bus, the diagnostic equipment is used for sending a diagnostic request protocol to the instrument through the OBD diagnostic interface, the instrument comprises a data acquisition module, a protocol conversion module, a transmission module and a control module, the data acquisition module, the protocol conversion module and the transmission module are all electrically connected with the controller, the data acquisition module is used for receiving the diagnosis request and then acquiring the diagnosis response data from the electronic control unit, the protocol conversion module is used for converting the acquired diagnosis response data into a return response data packet consistent with the diagnosis equipment request protocol, the control module is used for controlling the transmission module to transmit the return response data packet to the diagnostic equipment; the diagnostic equipment is also used for running fault identification operation according to the return response data packet and generating a diagnostic operation result.
6. The meter-based implementation of an OBD diagnostic system according to claim 5, characterized in that: the diagnostic response data includes real-time fault data, historical fault data, and fault freeze frame data.
7. The meter-based implementation of an OBD diagnostic system according to claim 5, characterized in that: the instrument further comprises a fault recognition module, the fault recognition module is electrically connected with the control module, and the fault recognition module is used for running fault recognition operation according to the acquired diagnosis response data and generating an instrument operation result.
8. The meter-based implementation of an OBD diagnostic system according to claim 7, characterized in that: the system comprises a meter, a diagnosis device and a user side, wherein the meter comprises a meter and a fault recognition module, the user side is in communication connection with the meter and the diagnosis device, the meter further comprises a recording module, the user side is used for receiving an operation result and a diagnosis operation result of the meter and generating a user solution, the fault recognition module is further used for secondarily operating fault recognition operation after the fault is solved and generating an operation result of the secondary meter, and if the fault in the operation result of the secondary meter is solved, the recording module generates a fault log record.
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