CN111045416B - Method and device for analyzing CAN (controller area network) signal of whole vehicle by using diagnosis message - Google Patents

Abstract

The invention utilizes the automobile standard OBDII interface to connect the diagnostic instrument with the Vector CANnase and pre-install the Vector CANoe host, and conveniently and quickly analyzes, calibrates and verifies the CAN signal of the key parameters of the whole automobile. The invention provides an analysis method for quickly and accurately positioning the corresponding relation between the whole vehicle parameters and CAN signals by using the diagnosis message under the cooperation of a diagnostic instrument, which effectively improves the efficiency of the key parameters of the international advanced whole vehicle model, completes the key signal analysis by analyzing and diagnosing a CAN bus and provides important reference for the whole vehicle benchmarks.

Description

A method and device for analyzing the CAN signal of a vehicle by using a diagnostic message

technical field

The invention belongs to the field of automobile electronic bus communication and diagnosis, and in particular relates to a method for analyzing CAN signals of a vehicle by using a diagnosis message.

Background technique

CAN is the abbreviation of Controller Area Network (CAN), which is one of the most widely used field buses in the world, especially widely used in automobile backbone network. It is of great value to mark the key vehicle parameters from the international advanced vehicle network signals for the development of domestic electric vehicles and fuel cell vehicles. The network load rate is high, so it takes a lot of time and energy for test engineers to locate the correspondence between CAN signals and vehicle parameters using communication messages, and the definitions of key signals for various vehicles are different. The message signal locating the vehicle parameters brings great difficulties in time and technology. Therefore, an analysis method using a diagnostic instrument to quickly locate and calibrate the parameters of the vehicle through the CAN diagnosis message signal is proposed. The vehicle diagnostic CAN can be connected to the diagnostic instrument and Vector CANcase.

SUMMARY OF THE INVENTION

In view of this, the present invention aims to propose a method for analyzing the CAN signal of a vehicle by using a diagnostic message. The diagnostic CAN bus, a diagnostic instrument, a CAN message acquisition tool and a CAN message monitoring and recording software are used to complete the analysis and diagnosis of the CAN bus. Analysis of key signals provides an important reference for vehicle benchmarking.

In order to achieve the above object, the technical scheme of the present invention is achieved in this way:

A method of analyzing the CAN signal of a vehicle by using a diagnostic message, using a diagnostic instrument to send a request for service to a diagnostic CAN bus and monitoring the response signal after the request, and monitoring and recording the response communication message after the request with a CAN message monitoring tool , and calculate the signal to be analyzed through comparative analysis.

Further, it specifically includes the following steps:

S1: Connect the wiring harness to the vehicle OBDII interface, diagnostic instrument and CAN data monitoring tool at the same time;

S2: Operate the diagnostic instrument to access each controller of the vehicle, and at the same time use the CAN data monitoring tool to collect the static diagnosis data of the real vehicle;

S3: Align the collected static data with the ISO14229 and ISO15765 diagnostic application layer standards, perform static variable diagnostic message data location analysis, and refer to the diagnostic instrument data stored in step S2 to quickly locate the vehicle static variable provided by the diagnostic instrument. Correspondence between parameters and diagnostic message data;

S4: For the static non-zero variable parameters corresponding to the diagnostic messages that have been preliminarily located in step S3, by changing the static working conditions of the vehicle, the above-mentioned located parameters are changed from one set of stable values to another set of stable values, and the corresponding The vehicle static variable parameters correspond to the proportional coefficient, signal offset, data storage format, and data type of the diagnostic message signal, and organize them into excel format files;

S5: collect the real vehicle dynamic diagnosis data according to the method in step S2;

S6: According to the method in step S3, quickly locate the corresponding relationship between variable parameters and diagnostic message data under dynamic vehicle conditions;

S7: For the dynamic non-zero variable parameters corresponding to the diagnostic messages that have been preliminarily located in step S6, by changing the dynamic working conditions of the vehicle, the above-mentioned located parameters are changed from one set of stable values to another set of stable values, and the corresponding The dynamic variable parameters of the whole vehicle correspond to the proportional coefficient, signal offset, data storage format, and data type of the diagnostic message signal, and organize them into excel format files;

S8: Compile the parsed vehicle parameter forwarding rules and organize them into excel format files;

S9: Use Vector CAPL Browser software to write script code to convert the diagnostic response message from the controller to the diagnostic instrument received on the CAN1 channel of the CAN monitoring tool to another CAN2 channel of the CAN monitoring tool according to the customized communication message format. Communication message format sending;

S10: Write the communication database .dbc file on CAN2 according to the excel sheet sorted in steps S4 and S7;

S11: Use the CAN2 channel of the Simulation interface in the Vector CANoe software to load the communication database .dbc file written in step S10, use the CAPL conversion script program written in step S9, and cooperate with the Graphic function of Vector CANoe to convert the parsed data identified by .dbc Drag each vehicle parameter signal from the Trace window to the Graphic window, change the vehicle operating conditions, compare the curve of the parameter in the diagnostic instrument with the curve change trend in the Graphic window, and whether the maximum and minimum values of the parameter are consistent, If they are consistent, the verification is successful; if they are inconsistent, return to step S1 to redo the analytical positioning and calibration of the parameter.

Further, in the step S2, the data collected by the CAN data monitoring tool is recorded as a file in .asc format; at the same time, the data of the diagnostic instrument is recorded as a file in a picture format or a corresponding screen recording format.

Further, the step S8 specifically includes, including compiling the parsed vehicle parameter forwarding rules, defining the message ID, the effective bit of the signal length, the proportional coefficient, and the signal offset, and arranging them into Excel format files, different models. Different diagnostic service standards are used.

Further, the step S9 specifically includes:

S901: Send the diagnostic request obtained from the control panel to the CAN1 channel;

S902: receive and cache the diagnostic response ID and the original hexadecimal data of the diagnostic response message returned by the controller;

S903: Process the original hexadecimal data in the diagnostic response message returned by the analysis controller, and according to the forwarding rules prepared in step S8, identify and parse the valid signals corresponding to the corresponding parameters and transfer them to a user-defined structure respectively, Including forwarding communication message ID, forwarding communication message DLC, forwarding communication message hexadecimal raw data;

S904: Send the communication message transferred in step S903 to the CAN2 channel.

Another object of the present invention is to provide a device for analyzing CAN signals of a vehicle by using a diagnostic message, including a signal analyzing device, which is used to send a request for service to the diagnostic CAN bus by using a diagnostic instrument and monitor the response signal after the request, and simultaneously use The CAN message monitoring tool monitors and records the response communication message after the request, and calculates the signal to be analyzed through comparative analysis and calibration.

further, including

Install the module to connect the wiring harness to the vehicle OBDII interface, diagnostic instrument and CAN data monitoring tool at the same time;

The first acquisition module is used to operate the diagnostic instrument to access each controller of the vehicle, and at the same time use the CAN data monitoring tool to collect the static diagnosis data of the real vehicle;

The positioning analysis module is used to benchmark the collected static data against the ISO14229 and ISO15765 diagnostic application layer standards, and to perform positioning and analysis of static variable diagnostic message data, referring to the diagnostic instrument data stored in the acquisition module, to quickly locate the diagnostic instrument provided. Correspondence between vehicle static variable parameters and diagnostic message data;

The first calculation module is used for the static non-zero variable parameters corresponding to the diagnostic messages that have been initially positioned in the positioning analysis module, by changing the static working conditions of the vehicle, so that the above-mentioned positioned parameters are changed from one set of stable values to another. Set the stable value, calculate the proportional coefficient, signal offset, data storage format, data type of the corresponding diagnostic message signal corresponding to the static variable parameters of the vehicle, and organize it into an excel format file;

The second collection module is used for collecting real vehicle dynamic diagnosis data according to the method of the first collection module;

The positioning module is used to quickly locate the corresponding relationship between variable parameters and diagnostic message data under dynamic vehicle conditions according to the method of the positioning analysis module;

The second calculation module is used to change the above-mentioned positioned parameters from one set of stable values to another set by changing the dynamic working conditions of the vehicle for the dynamic non-zero variable parameters corresponding to the diagnostic messages that have been preliminarily positioned in the positioning module. Stable value, calculate the proportional coefficient, signal offset, data storage format, data type of the corresponding diagnostic message signal corresponding to the dynamic variable parameters of the vehicle, and organize them into an excel format file;

The compilation module is used to compile the parsed vehicle parameter forwarding rules and organize them into excel format files;

The conversion module is used to write script code using Vector CAPL Browser software, and convert the diagnostic response message received by the controller to the diagnostic instrument on the CAN1 channel of the CAN monitoring tool to another one of the CAN monitoring tool according to the customized communication message format. CAN2 channel is sent in communication message format;

The writing module is used to write the communication database .dbc file on CAN2 according to the excel form organized by the first calculation module and the second calculation module;

The verification module is used to load the communication database .dbc file written in the writing module using the CAN2 channel of the Simulation interface in the Vector CANoe software, and then use the CAPL conversion script program written in the conversion module to cooperate with the Graphic function of VectorCANoe. Drag each analyzed vehicle parameter signal from the Trace window to the Graphic window, change the vehicle operating conditions, compare the curve of the parameter in the diagnostic instrument with the curve change trend in the Graphic window, and whether the maximum and minimum values of the parameter are If they are consistent, the verification is successful; if they are inconsistent, return to step S1 to redo the analytical positioning and calibration of the parameter.

Further, the first acquisition module specifically includes recording the data collected by the CAN data monitoring tool as a file in .asc format; meanwhile, recording the data of the diagnostic instrument as a file in a picture format or a corresponding screen recording format.

Further, the compiling module specifically includes compiling the parsed vehicle parameter forwarding rules, defining the message ID, the valid bits of the signal length, the proportional coefficient, and the signal offset, and arranging them into Excel format files. Different models use different rules. Diagnostic service standards.

Further, the conversion module specifically includes:

The diagnostic request sending module is used to send the diagnostic request obtained from the control panel to the CAN1 channel;

The diagnostic response receiving module is used to receive and cache the diagnostic response ID returned by the controller and the original hexadecimal data of the diagnostic response message;

The diagnostic response message parsing module is used to process the hexadecimal raw data in the diagnostic response message returned by the analysis controller, and according to the forwarding rules compiled in the compilation module, identify and parse the valid signals corresponding to the corresponding parameters and transfer them to The self-defined structure includes forwarding the communication message ID, forwarding the communication message DLC, and forwarding the original hexadecimal data of the communication message;

The communication message forwarding module is used to send the transferred communication message in the diagnostic response message parsing module to the CAN2 channel.

Compared with the prior art, the method for analyzing the CAN signal of a vehicle by using a diagnostic message according to the present invention has the following advantages:

The invention utilizes the diagnostic instrument to send the request service to the diagnostic CAN bus and monitors the response signal after the request, and uses the CAN message monitoring tool to monitor and record the response communication message after the request. By operating the control panel of the host computer, the real-time data of each controller can be monitored at the same time, while the diagnostic instrument can only enter one controller system at the same time to monitor the parameters of a single controller. Simultaneous monitoring of the parameters of each controller system of the whole vehicle is conducive to the data benchmarking analysis during the later performance test of advanced models.

Description of drawings

The accompanying drawings constituting a part of the present invention are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

1 is a schematic diagram of an analytical flowchart according to an embodiment of the present invention;

Fig. 2 is the identification conversion process flow diagram of the CAPL script code written according to the embodiment of the present invention;

FIG. 3 is a schematic diagram of the diagnosis and analysis of the vehicle model in which the in-vehicle controller supports 22 services in the ISO14229 standard according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of the diagnosis analysis of the vehicle model in which the in-vehicle controller supports the 2C service in the ISO14229 standard according to the embodiment of the present invention.

Detailed ways

It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.

The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

The present invention provides a method for analyzing CAN signals of a vehicle by using a diagnosis message, comprising the following steps:

S1, connect the male end of the wire harness divided into two parts to the OBDII interface of the vehicle, and connect the other two female ends of the wire harness to the diagnostic instrument and the CAN data monitoring tool (Vector CANcase) at the same time;

S2, operate the diagnostic instrument to access each controller of the vehicle, use the CAN data monitoring tool to collect real vehicle static diagnosis data, and record the data as a file in .asc format; at the same time, record the data of the diagnostic instrument as a picture format or the corresponding screen recording format;

S3, benchmark the collected static data against the diagnostic application layer standards such as ISO14229 and ISO15765, and perform static variable diagnostic message data positioning and analysis. Referring to the diagnostic instrument data stored in step S2, quickly locate the vehicle static variable provided by the diagnostic instrument. Correspondence between variable parameters and diagnostic message data;

S4, for the static non-zero variable parameters corresponding to the diagnostic messages that have been preliminarily located in step S3, by changing the static working conditions of the vehicle, the above-mentioned located parameters are changed from one set of stable values to another set of stable values, which is convenient and fast Accurately calculate the proportional coefficient, signal offset, data storage format and data type of the corresponding diagnostic message signal corresponding to the static variable parameters of the vehicle, and organize them into excel format files;

S5, according to the method in the step S2, carry out the real vehicle dynamic diagnosis data collection;

S6, according to the method in the step S3, quickly locate the corresponding relationship between the variable parameters and the diagnostic message data under the dynamic vehicle condition;

S7, for the dynamic non-zero variable parameters corresponding to the diagnostic messages that have been preliminarily located in step S6, by changing the dynamic working conditions of the vehicle, the above-mentioned located parameters are changed from one set of stable values to another set of stable values, which is convenient and fast Accurately calculate the proportional coefficient, signal offset, data storage format and data type of the corresponding diagnostic message signal corresponding to the dynamic variable parameters of the vehicle, and organize them into excel format files;

S8, compile the parsed vehicle parameter forwarding rules, and organize them into excel format files; take the models with 22 services and 2C service models that the in-vehicle controller supports the ISO14229 standard as examples to explain different forwarding rules.

According to different forwarding mechanisms, it is explained here

S8-1, the in-vehicle controller supports vehicle models with 22 services in the ISO14229 standard, and the present invention performs diagnosis and analysis according to the following process, as shown in FIG. 3 .

To initialize the variable, obtain from the panel whether the parameter button is pressed, if not pressed, continue to wait; if pressed, start the sending diagnostic request timer.

If the timing time is not up, continue to wait; when the timing time is up, send 22 a diagnostic request to serve a certain DID, and wait for the corresponding DID diagnostic request to respond.

If it does not respond, it continues to wait for a response; if it responds, it assigns the ID of the forwarding message and the signal value of each byte, and starts the 1ms timer for forwarding the message.

If the timing time is not up, continue to wait; when the timing time is up, the forwarding message will be sent on another channel.

S8-1, the in-vehicle controller supports the vehicle model of 2C service in the ISO14229 standard, the present invention performs diagnosis and analysis according to the following process, as shown in FIG. 4 .

Initialize the variable, send dynamic data request AA 00 through physical addressing, wait for the controller to send the corresponding ID communication message and judge whether byte[0]=0x00, if not, continue to wait; if byte[0]=0x00, start 100ms timer.

If the timing time is not up, continue to wait; when the timing time is up, the physical addressing sends a dynamic request 2C FE, and after receiving the response, judge whether it is the corresponding physical addressing response. timer.

If the timing time is not up, continue to wait; when the timing time is up, the physical addressing sends a dynamic request 2C FD, and after receiving the response, it is judged whether it is the corresponding physical addressing response. timer.

If the timing time is not up, continue to wait; when the timing time is up, the physical addressing sends a dynamic request AA 03 FE FD FC, waits for the controller to send a communication message with a response ID, and judges whether byte[0]=0xFE.

If so, start the 1ms timer, and forward the corresponding communication message on another channel after the time expires; if not, wait for the controller to send a communication message responding to the ID and determine whether byte[0]=0xFD.

If so, start the 1ms timer, and forward the corresponding communication message on another channel after the time expires; if not, wait for the controller to send a communication message responding to the ID and determine whether byte[0]=0xFC.

If so, start a 1ms timer, and forward the corresponding communication message on another channel after the time expires; if not, output a response error.

S9, use the Vector CAPL Browser software to write script code, and convert the diagnostic response message received by the controller on the CAN1 channel of the CAN monitoring tool to the diagnostic instrument to another CAN2 channel of the CAN monitoring tool according to the customized communication message format. The communication message format is sent, so that the advantage of forwarding and parsing is that the bus load rate of the original vehicle is not changed; further step S9 also includes the following sub-steps:

S9-1, diagnostic request sending module, used to send the diagnostic request obtained from the control panel to the CAN1 channel;

S9-2, a diagnostic response receiving module, used to receive and cache the diagnostic response ID returned by the controller and the original hexadecimal data of the diagnostic response message;

S9-3, a diagnostic response message parsing module, used to process the original hexadecimal data in the diagnostic response message returned by the analysis controller, and identify valid signals corresponding to the parsed corresponding parameters according to the forwarding rules compiled in step S8 They are respectively dumped into a self-defined structure, including forwarding the ID of the communication message, forwarding the DLC of the communication message, and forwarding the original hexadecimal data of the communication message;

S9-4, the communication message forwarding module, used for sending the communication message transferred in step S9-3 to the CAN2 channel;

S10, write the communication database .dbc file on CAN2 according to the excel sheet sorted in steps S4 and S7;

S11, after loading the communication database .dbc file written in step S10 on the CAN2 channel of the Simulation interface in the Vector CANoe software of the notebook computer, use the CAPL conversion script program written in the step S9 to cooperate with the Graphic function of VectorCANoe to identify the .dbc file. Drag each vehicle parameter signal analyzed from the Trace window to the Graphic window, change the vehicle operating conditions, and compare the curve of the parameter in the diagnostic instrument with the curve change trend in the Graphic window and the maximum and minimum values of the parameter. Whether it is consistent, if it is consistent, the verification is successful; if it is inconsistent, return to step S1 to re-analyze the positioning and calibration of the parameter.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (8)

1. a method utilizing diagnostic message to analyze vehicle CAN signal, is characterized in that: utilize diagnostic instrument to send request service to diagnostic CAN bus and monitor the response signal after the request, monitor and record the request with CAN message monitoring tool simultaneously The response communication message is calculated by comparative analysis and calibration of the signal to be analyzed; Specifically include the following steps: S1: Connect the wiring harness to the vehicle OBDII interface, diagnostic instrument and CAN data monitoring tool at the same time; S2: Operate the diagnostic instrument to access each controller of the vehicle, and at the same time use the CAN data monitoring tool to collect the static diagnosis data of the real vehicle; S3: Align the collected static data with the ISO14229 and ISO15765 diagnostic application layer standards, perform static variable diagnostic message data location analysis, and refer to the diagnostic instrument data stored in step S2 to quickly locate the vehicle static variable provided by the diagnostic instrument. Correspondence between parameters and diagnostic message data; S4: For the static non-zero variable parameters corresponding to the diagnostic messages that have been preliminarily located in step S3, by changing the static working conditions of the vehicle, the above-mentioned located parameters are changed from one set of stable values to another set of stable values, and the corresponding The vehicle static variable parameters correspond to the proportional coefficient, signal offset, data storage format, and data type of the diagnostic message signal, and organize them into excel format files; S5: collect the real vehicle dynamic diagnosis data according to the method in step S2; S6: According to the method in step S3, quickly locate the corresponding relationship between variable parameters and diagnostic message data under dynamic vehicle conditions; S7: For the dynamic non-zero variable parameters corresponding to the diagnostic messages that have been preliminarily located in step S6, by changing the dynamic working conditions of the vehicle, the above-mentioned located parameters are changed from one set of stable values to another set of stable values, and the corresponding The dynamic variable parameters of the whole vehicle correspond to the proportional coefficient, signal offset, data storage format, and data type of the diagnostic message signal, and organize them into excel format files; S8: Compile the parsed vehicle parameter forwarding rules and organize them into excel format files; S9: Use Vector CAPL Browser software to write script code to convert the diagnostic response message from the controller to the diagnostic instrument received on the CAN1 channel of the CAN monitoring tool to another CAN2 channel of the CAN monitoring tool according to the customized communication message format. Communication message format sending; S10: Write the communication database .dbc file on CAN2 according to the excel sheet sorted in steps S4 and S7; S11: Use the CAN2 channel of the Simulation interface in the Vector CANoe software to load the communication database .dbc file written in step S10, use the CAPL conversion script program written in step S9, and cooperate with the Graphic function of Vector CANoe to convert the parsed data identified by .dbc Drag each vehicle parameter signal from the Trace window to the Graphic window, change the vehicle operating conditions, compare the curve of the parameter in the diagnostic instrument with the curve change trend in the Graphic window, and whether the maximum and minimum values of the parameter are consistent, If they are consistent, the verification is successful; if they are inconsistent, return to step S1 to redo the analytical positioning and calibration of the parameter. 2. a kind of method that utilizes diagnostic message to analyze vehicle CAN signal according to claim 1, is characterized in that: in described step S2, the data that CAN data monitoring tool gathers is recorded as the file of .asc format; Simultaneously Record the data of the diagnostic instrument as a file in image format or corresponding screen recording format. 3. A method for analyzing the CAN signal of a vehicle by using a diagnostic message according to claim 1, wherein the step S8 specifically includes, including compiling the parsed vehicle parameter forwarding rule, and interpreting the message ID. , Signal length effective bits, scale factor, signal offset are defined and organized into Excel format files. Different models use different diagnostic service standards. 4. a kind of method that utilizes diagnostic message to parse the CAN signal of the whole vehicle according to claim 1, is characterized in that: in described step S9, specifically comprises: S901: Send the diagnostic request obtained from the control panel to the CAN1 channel; S902: Receive and cache the diagnostic response ID and the original hexadecimal data of the diagnostic response message returned by the controller; S903: Process the original hexadecimal data in the diagnostic response message returned by the analysis controller, and according to the forwarding rules prepared in step S8, identify and parse the valid signals corresponding to the corresponding parameters and transfer them to a user-defined structure respectively, Including forwarding communication message ID, forwarding communication message DLC, forwarding communication message hexadecimal raw data; S904: Send the communication message transferred in step S903 to the CAN2 channel. 5. A device for analyzing a vehicle CAN signal using a diagnostic message, characterized in that: comprising a signal analyzing device, for utilizing a diagnostic instrument to send a request for service to the diagnostic CAN bus and monitoring the response signal after the request, and simultaneously using a CAN message The monitoring tool monitors and records the response communication message after the request, and calculates the signal to be analyzed through comparative analysis and calibration; Specifically include: Install the module to connect the wiring harness to the vehicle OBDII interface, diagnostic instrument and CAN data monitoring tool at the same time; The first acquisition module is used to operate the diagnostic instrument to access each controller of the vehicle, and at the same time use the CAN data monitoring tool to collect the static diagnosis data of the real vehicle; The positioning analysis module is used to benchmark the collected static data against the ISO14229 and ISO15765 diagnostic application layer standards, and to perform positioning and analysis of static variable diagnostic message data, referring to the diagnostic instrument data stored in the acquisition module, to quickly locate the diagnostic instrument provided. Correspondence between vehicle static variable parameters and diagnostic message data; The first calculation module is used for the static non-zero variable parameters corresponding to the diagnostic messages that have been initially positioned in the positioning analysis module, by changing the static working conditions of the vehicle, so that the above-mentioned positioned parameters are changed from one set of stable values to another. Set the stable value, calculate the proportional coefficient, signal offset, data storage format, data type of the corresponding diagnostic message signal corresponding to the static variable parameters of the vehicle, and organize it into an excel format file; The second collection module is used for collecting real vehicle dynamic diagnosis data according to the method of the first collection module; The positioning module is used to quickly locate the corresponding relationship between variable parameters and diagnostic message data under dynamic vehicle conditions according to the method of the positioning analysis module; The second calculation module is used to change the above-mentioned positioned parameters from one set of stable values to another set by changing the dynamic working conditions of the vehicle for the dynamic non-zero variable parameters corresponding to the diagnostic messages that have been preliminarily positioned in the positioning module. Stable value, calculate the proportional coefficient, signal offset, data storage format, data type of the corresponding diagnostic message signal corresponding to the dynamic variable parameters of the vehicle, and organize them into an excel format file; The compilation module is used to compile the parsed vehicle parameter forwarding rules and organize them into excel format files; The conversion module is used to write script code using Vector CAPL Browser software, and convert the diagnostic response message received by the controller to the diagnostic instrument on the CAN1 channel of the CAN monitoring tool to another one of the CAN monitoring tool according to the customized communication message format. CAN2 channel is sent in communication message format; The writing module is used to write the communication database .dbc file on CAN2 according to the excel form organized by the first calculation module and the second calculation module; The verification module is used to load the communication database .dbc file written in the writing module using the CAN2 channel of the Simulation interface in the Vector CANoe software, and then use the CAPL conversion script program written in the conversion module to cooperate with the Graphic function of VectorCANoe. Drag each analyzed vehicle parameter signal from the Trace window to the Graphic window, change the vehicle operating conditions, compare the curve of the parameter in the diagnostic instrument with the curve change trend in the Graphic window, and whether the maximum and minimum values of the parameter are If they are consistent, the verification is successful; if they are inconsistent, return to step S1 to redo the analytical positioning and calibration of the parameter. 6. The device according to claim 5, characterized in that: the first acquisition module specifically includes recording the data collected by the CAN data monitoring tool as .asc format. At the same time, the data of the diagnostic instrument is recorded as a file in the image format or the corresponding screen recording format. 7. The device according to claim 5, characterized in that: the compilation module specifically comprises the compilation and analysis of the vehicle parameter forwarding rules, the message ID, the signal length Effective bits, proportional coefficients, and signal offsets are defined and organized into Excel format files. Different models use different diagnostic service standards. 8. A device for analyzing a vehicle CAN signal by using a diagnostic message according to claim 5, wherein the conversion module specifically comprises: The diagnostic request sending module is used to send the diagnostic request obtained from the control panel to the CAN1 channel; The diagnostic response receiving module is used to receive and cache the diagnostic response ID returned by the controller and the original hexadecimal data of the diagnostic response message; The diagnostic response message parsing module is used to process the original hexadecimal data in the diagnostic response message returned by the analysis controller, and according to the forwarding rules compiled in the compilation module, identify the valid signals corresponding to the parsed corresponding parameters and transfer them to The self-defined structure includes forwarding the communication message ID, forwarding the communication message DLC, and forwarding the original hexadecimal data of the communication message; The communication message forwarding module is used to send the transferred communication message in the diagnostic response message parsing module to the CAN2 channel.

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