WO2022037150A1 - Vehicle ecu identification method and system, and vehicle diagnosis device - Google Patents

Abstract

A vehicle ECU identification method, comprising: acquiring communication parameters; sequentially selecting communication parameters from scanned communication parameters and communication parameters pre-configured in a database, and sending, to a vehicle ECU, version information identification commands pre-configured in the database one by one by means of the selected communication parameters (S102); acquiring identification information from data fed back by the vehicle ECU, converting the identification information into an ASCII code, and identifying the model of the vehicle ECU by means of the ASCII code; determining whether the ASCII code can identify a unique model of the vehicle ECU, if so, a diagnostic device entering a corresponding diagnosis interface, and if not, sending, to the vehicle ECU, a data stream read command corresponding to the current version information identification command by means of the current communication parameters (S104); and identifying the unique model of the vehicle ECU by means of the read data stream, and the diagnostic device entering a corresponding diagnosis interface (S105).

Description

Vehicle ECU identification method, system and vehicle diagnostic equipment technical field

The invention belongs to the technical field of vehicle diagnosis, and in particular relates to a vehicle ECU identification method, system and vehicle diagnosis equipment.

Background technique

With the development of vehicle electronic control technology in recent years, the structure and control algorithm of the electronic control system have become more and more complex, and the scope of control involved has continued to expand, and it has continued to develop in the direction of intelligence. Nowadays, the difficulty of vehicle fault diagnosis is also increasing. Also, it is often impossible to locate the source of the fault with empirical maintenance, and the application of vehicle diagnostic equipment will become more and more important.

The vehicle ECU monitors various data information of the vehicle in real time, establishes communication with the ECU with the help of vehicle diagnostic equipment, and obtains the fault code information stored in the ECU. Through these, the source and cause of the fault can be judged and the maintenance efficiency of the vehicle can be improved. When using a car diagnostic instrument for vehicle inspection, it is necessary to determine the specific model of the ECU that the vehicle is equipped with. Different vehicles have different emission standards and are equipped with different types of ECUs. Before the car inspection, it is necessary to accurately determine the ECU model before using the diagnostic equipment and The ECU establishes correct communication, reads vehicle fault codes and monitors vehicle data flow in real time.

When carrying out vehicle maintenance, because the vehicle ECU is installed in a hidden place of the vehicle, it is impossible to directly obtain the ECU model information. When using the diagnostic equipment to operate, the maintenance personnel often cannot accurately find the corresponding diagnostic interface, resulting in the inability to use the diagnostic equipment to establish with the ECU. As a result of the communication connection, the maintenance difficulty is increased; with the expansion of the vehicle after-sales maintenance market, the need for diagnostic equipment to automatically identify the ECU model is more urgent.

SUMMARY OF THE INVENTION

Based on this, in view of the above technical problems, a vehicle ECU identification method, system and vehicle diagnosis device are provided.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A vehicle ECU identification method, comprising:

S101. Scan the OBD port of the vehicle to obtain communication parameters, where the communication parameters include pins, communication methods and baud rates;

S102. Select communication parameters in sequence from the scanned communication parameters and the communication parameters preconfigured in the database, and send the version information identification commands preconfigured in the database to the vehicle ECU one by one through the selected communication parameters, wherein the scanning is preferentially selected. The received communication parameters, the database has a communication parameter, a communication address, a version information identification command and a corresponding table for reading a data stream command;

S103. After each version information identification command is sent, it is judged whether the interaction with the vehicle ECU is normal through the feedback data of the vehicle ECU. If not, the next version information identification command is sent according to step 102. Obtain identification information, convert the identification information into standard specification ASCII code, and identify the model of the vehicle ECU through the ASCII code;

S104, determine whether the ASCII code can identify the unique model of the vehicle ECU, if so, the diagnostic device enters the corresponding diagnosis interface, if not, send the read data corresponding to the current version information identification command to the vehicle ECU through the current communication parameters stream command;

S105, the unique model of the vehicle ECU is identified through the read data stream, and the diagnosis device enters a corresponding diagnosis interface.

In the step S101, the communication mode is identified by the voltage of the pin.

The vehicle ECU is a Delphi ECU, which takes the data M and N of the last 9th and 10th bits in the data stream, and converts M and N into decimal numbers m and n. If m*0.1 is greater than 8 and less than 28, then the vehicle ECU The model of the ECU is DCM3.1. If n*0.1 is greater than 8 and less than 28, the model of the vehicle ECU is DCM3.2.

The solution also relates to a vehicle ECU identification system, including a storage module, wherein the storage module includes a plurality of instructions loaded and executed by the processor:

S101. Scan the OBD port of the vehicle to obtain communication parameters, where the communication parameters include pins, communication methods and baud rates;

S102. Select communication parameters in sequence from the scanned communication parameters and the communication parameters preconfigured in the database, and send the version information identification commands preconfigured in the database to the vehicle ECU one by one through the selected communication parameters, wherein the scanning is preferentially selected. The received communication parameters, the database has a communication parameter, a communication address, a version information identification command and a corresponding table for reading a data stream command;

S103. After each version information identification command is sent, it is judged whether the interaction with the vehicle ECU is normal through the feedback data of the vehicle ECU. If not, the next version information identification command is sent according to step 102. Obtain identification information, convert the identification information into standard specification ASCII code, and identify the model of the vehicle ECU through the ASCII code;

S104, determine whether the ASCII code can identify the unique model of the vehicle ECU, if so, the diagnostic device enters the corresponding diagnosis interface, if not, send the read data corresponding to the current version information identification command to the vehicle ECU through the current communication parameters stream command;

S105, the unique model of the vehicle ECU is identified through the read data stream, and the diagnosis device enters a corresponding diagnosis interface.

In the step S101, the communication mode is identified by the voltage of the pin.

The vehicle ECU is a Delphi ECU, which takes the data M and N of the last 9th and 10th bits in the data stream, and converts M and N into decimal numbers m and n. If m*0.1 is greater than 8 and less than 28, then the vehicle ECU The model of the ECU is DCM3.1. If n*0.1 is greater than 8 and less than 28, the model of the vehicle ECU is DCM3.2.

The solution also relates to a vehicle diagnostic device, which has a vehicle ECU identification system, the vehicle ECU identification system includes a storage module, and the storage module includes a plurality of instructions loaded and executed by the processor:

S101. Scan the OBD port of the vehicle to obtain communication parameters, where the communication parameters include pins, communication methods and baud rates;

S102. Select communication parameters in sequence from the scanned communication parameters and the communication parameters preconfigured in the database, and send the version information identification commands preconfigured in the database to the vehicle ECU one by one through the selected communication parameters, wherein the scanning is preferentially selected. The received communication parameters, the database has a communication parameter, a communication address, a version information identification command and a corresponding table for reading a data stream command;

S103. After each version information identification command is sent, it is judged whether the interaction with the vehicle ECU is normal through the feedback data of the vehicle ECU. If not, the next version information identification command is sent according to step 102. Obtain identification information, convert the identification information into standard specification ASCII code, and identify the model of the vehicle ECU through the ASCII code;

S104, determine whether the ASCII code can identify the unique model of the vehicle ECU, if so, the diagnostic device enters the corresponding diagnosis interface, if not, send the read data corresponding to the current version information identification command to the vehicle ECU through the current communication parameters stream command;

S105. Identify the unique model of the vehicle ECU through the read data stream, and the diagnostic device enters the corresponding diagnostic interface.

In the step S101, the communication mode is identified by the voltage of the pin.

The vehicle ECU is a Delphi ECU, which takes the data M and N of the last 9th and 10th bits in the data stream, and converts M and N into decimal numbers m and n. If m*0.1 is greater than 8 and less than 28, then the vehicle ECU The model of the ECU is DCM3.1. If n*0.1 is greater than 8 and less than 28, the model of the vehicle ECU is DCM3.2.

The invention solves the problem that the fault code cannot be read normally and the data flow can be monitored because the ECU model of the vehicle cannot be effectively judged in the current maintenance process, and the recognition accuracy and efficiency are high.

Description of drawings

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments:

FIG. 1 is a flow chart of the present invention.

detailed description

As shown in Figure 1, a vehicle ECU identification method includes:

S101. Scan the OBD port of the vehicle to obtain communication parameters, where the communication parameters include pins, communication methods and baud rates. Such as 6/14 pins, CAN line communication, 500KBPS baud rate.

S102: Select communication parameters in sequence from the scanned communication parameters and the communication parameters preconfigured in the database, and send the version information identification commands preconfigured in the database one by one to the vehicle ECU through the selected communication parameters.

Among them, the scanned communication parameters are preferentially selected. After the scanned communication parameters are all selected, the communication parameters configured in the database are selected, which can speed up the automatic identification speed.

The database has communication parameters, communication addresses, version information identification commands and a corresponding table of reading data stream commands, and the communication address is the address where the ECU receives the command.

S103. After each version information identification command is sent, it is judged whether the interaction with the vehicle ECU is normal according to the feedback data of the vehicle ECU (the ECU will feed back standard data). The identification information is obtained from the data fed back by the vehicle ECU, and the identification information is converted into a standard specification ASCII code, and the model of the vehicle ECU is identified through the ASCII code.

For example, the version information identification command 22 F1 94 is sent to the communication address 07E0/07E8 with 6/14 pins, CAN line communication, and 500KBPS baud rate. It should be pointed out that the version information identification commands and their communication addresses are different for different types of ECUs.

Wherein, sending the next version information identification command according to step 102 refers to sending the next version information identification command through the current communication parameters if all the version information identification commands configured in the database have not been sent, if the version information identification command configured in the database is sent have been sent, select the next communication parameter, and send the version information identification commands pre-configured in the database to the vehicle ECU one by one.

S104. Determine whether the ASCII code can identify the unique model of the vehicle ECU. If so, the diagnostic device will enter the corresponding diagnostic interface. If not, send a read data stream command corresponding to the current version information identification command to the vehicle ECU through the current communication parameters. .

For example, the data fed back by the vehicle ECU is: "62 F1 94 31 58 59 55 4E 41 50 50", take 59 55 4E 41 50 50 as the identification information, and convert it into the standard specification ASCII code as YUNAPP, indicating that the ECU to be tested is in the cloud If the Delphi ECU is converted into the standard specification ASCII code as Delphi, it means that the unique model of the vehicle ECU cannot be recognized.

S105, the unique model of the vehicle ECU is identified through the read data stream, and the diagnosis device enters a corresponding diagnosis interface. For example, the battery voltage can be analyzed through the battery voltage bit in the data stream, so as to determine the unique model of the vehicle ECU. Of course, it can also be determined by data such as fuel rail pressure.

The invention solves the problem that the fault code cannot be read normally and the data flow can be monitored because the ECU model of the vehicle cannot be effectively judged in the current maintenance process, and the recognition accuracy and efficiency are high.

In this embodiment, the step S101 identifies the communication method by the voltage of the pin.

Among them, the vehicle diagnostic equipment detects the communication protocol of the vehicle by scanning the voltage of the 16 pins of the OBD interface. The voltage of each communication pin is shown in Table 1 as an example:

Communication pins	P01	P02	P03	P04	P05	P06	P07	P08
Voltage (v)	0	0	0	0	0	2.6	24.3	4.2
Communication pins	P09	P10	P11	P12	P13	P14	P15	P16
Voltage (v)	0	5.6	4.5	-2	0	2.4	0	25.6

Table 1

When the voltage of the communication pin is 2.5±0.5V, the communication protocol is CAN protocol, the high voltage pin is CANH, and the low voltage pin is CANL. In Table 1, CAN high is pin P06, CAN low is pin P14.

When the voltage of the communication pin is 1-2V lower than the voltage of the P16 pin, the communication protocol is the K line. In Table 1, the pin of the K line is P07.

There are generally three groups of CAN line communication pins: 6 and 14 pins, 3 and 11 pins, 1 and 9 pins, baud rate is generally 250KBS, 500KBPS, K line communication pins generally have two: 6 pins and 7 pins, baud rate Usually 10400BPS.

It is a common method in the industry to detect the vehicle protocol by voltage, and the detection of the 485 and 232 protocols will not be repeated here.

In this embodiment, the vehicle ECU is a Delphi ECU, and the reciprocal of the data stream "61 B0 67 67 64 62 00 00 00 1C 1C 65 65 77 77 5B 5B 32 32 19 MN 44 00 01 00 28 00 00 00" is taken The 9th and 10th bits of data M and N, convert M and N into decimal numbers m and n, if m*0.1 is greater than 8 and less than 28, the model of the vehicle ECU is DCM3.1, if n*0.1 is greater than 8 and If it is less than 28, the model of the vehicle ECU is DCM3.2.

Since ECU data can be flashed, there are a lot of flashed data on the market, and there will be many version numbers. Sometimes it is impossible to distinguish the specific model just by identifying the ECU version number, but it can be easily distinguished by the data stream. Well, like the above Delphi ECU, the battery voltages of two different Delphi ECUs can be parsed through the data of M and N bits, corresponding to DCM3.1 and DCM3.2 respectively.

The present invention also relates to a vehicle ECU identification system, including a storage module, the storage module including a plurality of instructions loaded and executed by a processor, as shown in FIG. 1 :

S101. Scan the OBD port of the vehicle to obtain communication parameters, where the communication parameters include pins, communication methods and baud rates. Such as 6/14 pins, CAN line communication, 500KBPS baud rate.

S102: Select communication parameters in sequence from the scanned communication parameters and the communication parameters preconfigured in the database, and send the version information identification commands preconfigured in the database one by one to the vehicle ECU through the selected communication parameters.

Among them, the scanned communication parameters are preferentially selected. After the scanned communication parameters are all selected, the communication parameters configured in the database are selected, which can speed up the automatic identification speed.

The database has a correspondence table of communication parameters, communication addresses, version information identification commands and reading data stream commands, and the communication address is the address where the ECU receives the command.

S103. After each version information identification command is sent, it is judged whether the interaction with the vehicle ECU is normal according to the feedback data of the vehicle ECU (the ECU will feed back standard data). The identification information is obtained from the data fed back by the vehicle ECU, and the identification information is converted into a standard specification ASCII code, and the model of the vehicle ECU is identified through the ASCII code.

For example, the version information identification command 22F194 is sent to the communication address 07E0/07E8 with 6/14 pins, CAN line communication, and 500KBPS baud rate. It should be pointed out that the version information identification commands and their communication addresses of different types of ECUs are different.

Wherein, sending the next version information identification command according to step 102 refers to sending the next version information identification command through the current communication parameters if all the version information identification commands configured in the database have not been sent, if the version information identification command configured in the database is sent have been sent, select the next communication parameter, and send the version information identification commands pre-configured in the database to the vehicle ECU one by one.

S104. Determine whether the ASCII code can identify the unique model of the vehicle ECU. If so, the diagnostic device will enter the corresponding diagnostic interface. If not, send a read data stream command corresponding to the current version information identification command to the vehicle ECU through the current communication parameters. .

For example, the data fed back by the vehicle ECU is: "62 F1 94 31 58 59 55 4E 41 50 50", take 59 55 4E 41 50 50 as the identification information, and convert it into the standard specification ASCII code as YUNAPP, indicating that the ECU to be tested is in the cloud If the Delphi ECU is converted into the standard specification ASCII code as Delphi, it means that the unique model of the vehicle ECU cannot be recognized.

S105, the unique model of the vehicle ECU is identified through the read data stream, and the diagnosis device enters a corresponding diagnosis interface. For example, the battery voltage can be analyzed through the battery voltage bit in the data stream, so as to determine the unique model of the vehicle ECU.

The invention solves the problem that the fault code cannot be read normally and the data flow can be monitored because the ECU model of the vehicle cannot be effectively judged in the current maintenance process, and the recognition accuracy and efficiency are high.

In this embodiment, the step S101 identifies the communication method by the voltage of the pin.

Among them, the vehicle diagnostic equipment detects the communication protocol of the vehicle by scanning the voltage of the 16 pins of the OBD interface. The voltage of each communication pin is shown in Table 1 as an example:

Communication pins	P01	P02	P03	P04	P05	P06	P07	P08
Voltage (v)	0	0	0	0	0	2.6	24.3	4.2
Communication pins	P09	P10	P11	P12	P13	P14	P15	P16
Voltage (v)	0	5.6	4.5	-2	0	2.4	0	25.6

Table 1

When the voltage of the communication pin is 2.5±0.5V, the communication protocol is CAN protocol, the high voltage pin is CANH, and the low voltage pin is CANL. In Table 1, CAN high is pin P06, CAN low is pin P14.

When the voltage of the communication pin is 1-2V lower than the voltage of the P16 pin, the communication protocol is the K line. In Table 1, the pin of the K line is P07.

There are generally three groups of CAN line communication pins: 6 and 14 pins, 3 and 11 pins, 1 and 9 pins, baud rate is generally 250KBS, 500KBPS, K line communication pins generally have two: 6 pins and 7 pins, baud rate Usually 10400BPS.

It is a common method in the industry to detect the vehicle protocol by voltage, and the detection of the 485 and 232 protocols will not be repeated here.

In this embodiment, the vehicle ECU is a Delphi ECU, and the reciprocal of the data stream "61 B0 67 67 64 62 00 00 00 1C 1C 65 65 77 77 5B 5B 32 32 19 MN 44 00 01 00 28 00 00 00" is taken The 9th and 10th bits of data M and N, convert M and N into decimal numbers m and n, if m*0.1 is greater than 8 and less than 28, the model of the vehicle ECU is DCM3.1, if n*0.1 is greater than 8 and If it is less than 28, the model of the vehicle ECU is DCM3.2.

Since ECU data can be flashed, there are a lot of flashed data on the market, and there will be many version numbers. Sometimes it is impossible to distinguish the specific model just by identifying the ECU version number, but it can be easily distinguished by the data stream. Well, like the above Delphi ECU, the battery voltages of two different Delphi ECUs can be parsed through the data of M and N bits, corresponding to DCM3.1 and DCM3.2 respectively.

The present invention also relates to a vehicle diagnosis device, which has a vehicle ECU identification system, the vehicle ECU identification system includes a storage module, and the storage module includes a plurality of instructions loaded and executed by a processor, as shown in FIG. 1 :

S101. Scan the OBD port of the vehicle to obtain communication parameters, where the communication parameters include pins, communication methods and baud rates. Such as 6/14 pins, CAN line communication, 500KBPS baud rate.

S102: Select communication parameters in sequence from the scanned communication parameters and the communication parameters preconfigured in the database, and send the version information identification commands preconfigured in the database one by one to the vehicle ECU through the selected communication parameters.

Among them, the scanned communication parameters are preferentially selected. After the scanned communication parameters are all selected, the communication parameters configured in the database are selected, which can speed up the automatic identification speed.

The database has communication parameters, communication addresses, version information identification commands and a corresponding table of reading data stream commands, and the communication address is the address where the ECU receives the command.

S103. After each version information identification command is sent, it is judged whether the interaction with the vehicle ECU is normal according to the feedback data of the vehicle ECU (the ECU will feed back standard data). The identification information is obtained from the data fed back by the vehicle ECU, and the identification information is converted into a standard specification ASCII code, and the model of the vehicle ECU is identified through the ASCII code.

For example, the version information identification command 22F194 is sent to the communication address 07E0/07E8 with 6/14 pins, CAN line communication, and 500KBPS baud rate. It should be pointed out that the version information identification commands and their communication addresses of different types of ECUs are different.

Wherein, sending the next version information identification command according to step 102 refers to sending the next version information identification command through the current communication parameters if all the version information identification commands configured in the database have not been sent, if the version information identification command configured in the database is sent have been sent, select the next communication parameter, and send the version information identification commands pre-configured in the database to the vehicle ECU one by one.

S104. Determine whether the ASCII code can identify the unique model of the vehicle ECU. If so, the diagnostic device will enter the corresponding diagnostic interface. If not, send a read data stream command corresponding to the current version information identification command to the vehicle ECU through the current communication parameters. .

For example, the data fed back by the vehicle ECU is: "62 F1 94 31 58 59 55 4E 41 50 50", take 59 55 4E 41 50 50 as the identification information, and convert it into the standard specification ASCII code as YUNAPP, indicating that the ECU to be tested is in the cloud If the Delphi ECU is converted into the standard specification ASCII code as Delphi, it means that the unique model of the vehicle ECU cannot be recognized.

S105, the unique model of the vehicle ECU is identified through the read data stream, and the diagnosis device enters a corresponding diagnosis interface. For example, the battery voltage can be analyzed through the battery voltage bit in the data stream, so as to determine the unique model of the vehicle ECU.

The invention solves the problem that the fault code cannot be read normally and the data flow can be monitored because the ECU model of the vehicle cannot be effectively judged in the current maintenance process, and the recognition accuracy and efficiency are high.

In this embodiment, the step S101 identifies the communication method by the voltage of the pin.

Among them, the vehicle diagnostic equipment detects the communication protocol of the vehicle by scanning the voltage of the 16 pins of the OBD interface. The voltage of each communication pin is shown in Table 1 as an example:

Communication pins	P01	P02	P03	P04	P05	P06	P07	P08
Voltage (v)	0	0	0	0	0	2.6	24.3	4.2
Communication pins	P09	P10	P11	P12	P13	P14	P15	P16
Voltage (v)	0	5.6	4.5	-2	0	2.4	0	25.6

Table 1

When the voltage of the communication pin is 2.5±0.5V, the communication protocol is CAN protocol, the high voltage pin is CANH, and the low voltage pin is CANL. In Table 1, CAN high is pin P06, CAN low is pin P14.

When the voltage of the communication pin is 1-2V lower than the voltage of the P16 pin, the communication protocol is the K line. In Table 1, the pin of the K line is P07.

There are generally three groups of CAN line communication pins: 6 and 14 pins, 3 and 11 pins, 1 and 9 pins, baud rate is generally 250KBS, 500KBPS, K line communication pins generally have two: 6 pins and 7 pins, baud rate Usually 10400BPS.

It is a common method in the industry to detect the vehicle protocol by voltage, and the detection of the 485 and 232 protocols will not be repeated here.

In this embodiment, the vehicle ECU is a Delphi ECU, and the reciprocal of the data stream "61 B0 67 67 64 62 00 00 00 1C 1C 65 65 77 77 5B 5B 32 32 19 MN 44 00 01 00 28 00 00 00" is taken The 9th and 10th bits of data M and N, convert M and N into decimal numbers m and n, if m*0.1 is greater than 8 and less than 28, the model of the vehicle ECU is DCM3.1, if n*0.1 is greater than 8 and If it is less than 28, the model of the vehicle ECU is DCM3.2.

Since ECU data can be flashed, there are a lot of flashed data on the market, and there will be many version numbers. Sometimes it is impossible to distinguish the specific model just by identifying the ECU version number, but it can be easily distinguished by the data stream. Well, like the above Delphi ECU, the battery voltages of two different Delphi ECUs can be parsed through the data of M and N bits, corresponding to DCM3.1 and DCM3.2 respectively.

However, those skilled in the art should realize that the above embodiments are only used to illustrate the present invention, not to limit the present invention. Variations and modifications of the examples will fall within the scope of the claims of the present invention.

Claims (9)

1. A vehicle ECU identification method, comprising:

   S101. Scan the OBD port of the vehicle to obtain communication parameters, where the communication parameters include pins, communication methods and baud rates;

   S102. Select communication parameters in sequence from the scanned communication parameters and the communication parameters preconfigured in the database, and send the version information identification commands preconfigured in the database to the vehicle ECU one by one through the selected communication parameters, wherein the scanning is preferentially selected. The received communication parameters, the database has a communication parameter, a communication address, a version information identification command and a corresponding table for reading a data stream command;

   S103. After each version information identification command is sent, it is judged whether the interaction with the vehicle ECU is normal through the feedback data of the vehicle ECU. If not, the next version information identification command is sent according to step 102. Obtain identification information, convert the identification information into standard specification ASCII code, and identify the model of the vehicle ECU through the ASCII code;

   S104, determine whether the ASCII code can identify the unique model of the vehicle ECU, if so, the diagnostic device enters the corresponding diagnosis interface, if not, send the read data corresponding to the current version information identification command to the vehicle ECU through the current communication parameters stream command;

   S105, the unique model of the vehicle ECU is identified through the read data stream, and the diagnosis device enters a corresponding diagnosis interface.
2. The method for identifying a vehicle ECU according to claim 1, wherein the step S101 identifies the communication mode through the voltage of a pin.
3. A vehicle ECU identification method according to claim 1 or 2, characterized in that, the vehicle ECU is a Delphi ECU, and the 9th and 10th digit data M and N from the bottom in the data stream are taken, and M and N are converted into In decimal numbers m and n, if m*0.1 is greater than 8 and less than 28, the model of the vehicle ECU is DCM3.1; if n*0.1 is greater than 8 and less than 28, the model of the vehicle ECU is DCM3.2.
4. A vehicle ECU identification system is characterized in that, comprises storage module, and described storage module comprises a plurality of instructions loaded and executed by processor:

   S101. Scan the OBD port of the vehicle to obtain communication parameters, where the communication parameters include pins, communication methods and baud rates;

   S102. Select communication parameters in sequence from the scanned communication parameters and the communication parameters preconfigured in the database, and send the version information identification commands preconfigured in the database to the vehicle ECU one by one through the selected communication parameters, wherein the scanning is preferentially selected. The received communication parameters, the database has a communication parameter, a communication address, a version information identification command and a corresponding table for reading a data stream command;

   S103. After each version information identification command is sent, it is judged whether the interaction with the vehicle ECU is normal through the feedback data of the vehicle ECU. If not, the next version information identification command is sent according to step 102. Obtain identification information, convert the identification information into standard specification ASCII code, and identify the model of the vehicle ECU through the ASCII code;

   S104, determine whether the ASCII code can identify the unique model of the vehicle ECU, if so, the diagnostic device enters the corresponding diagnosis interface, if not, send the read data corresponding to the current version information identification command to the vehicle ECU through the current communication parameters stream command;

   S105, the unique model of the vehicle ECU is identified through the read data stream, and the diagnosis device enters a corresponding diagnosis interface.
5. The vehicle ECU identification system according to claim 4, wherein the step S101 identifies the communication mode by the voltage of the pin.
6. A vehicle ECU identification system according to claim 4 or 5, characterized in that, the vehicle ECU is a Delphi ECU, and takes the data M and N of the last 9th and 10th bits in the data stream, and converts M and N into In decimal numbers m and n, if m*0.1 is greater than 8 and less than 28, the model of the vehicle ECU is DCM3.1; if n*0.1 is greater than 8 and less than 28, the model of the vehicle ECU is DCM3.2.
7. A vehicle diagnostic equipment is characterized in that it has a vehicle ECU identification system, the vehicle ECU identification system includes a storage module, and the storage module includes a plurality of instructions loaded and executed by a processor:

   S101. Scan the OBD port of the vehicle to obtain communication parameters, where the communication parameters include pins, communication methods and baud rates;

   S102. Select communication parameters in sequence from the scanned communication parameters and the communication parameters preconfigured in the database, and send the version information identification commands preconfigured in the database to the vehicle ECU one by one through the selected communication parameters, wherein the scanning is preferentially selected. The received communication parameters, the database has a communication parameter, a communication address, a version information identification command and a corresponding table for reading a data stream command;

   S103. After each version information identification command is sent, it is judged whether the interaction with the vehicle ECU is normal through the feedback data of the vehicle ECU. If not, the next version information identification command is sent according to step 102. Obtain identification information, convert the identification information into standard specification ASCII code, and identify the model of the vehicle ECU through the ASCII code;

   S104, determine whether the ASCII code can identify the unique model of the vehicle ECU, if so, the diagnostic device enters the corresponding diagnosis interface, if not, send the read data corresponding to the current version information identification command to the vehicle ECU through the current communication parameters stream command;

   S105, the unique model of the vehicle ECU is identified through the read data stream, and the diagnosis device enters a corresponding diagnosis interface.
8. The vehicle diagnostic device according to claim 7, wherein the step S101 identifies the communication mode by the voltage of the pin.
9. A vehicle diagnostic device according to claim 7 or 8, wherein the vehicle ECU is a Delphi ECU, and takes the data M and N of the last 9th and 10th bits in the data stream, and converts M and N into Decimal numbers m and n. If m*0.1 is greater than 8 and less than 28, the model of the vehicle ECU is DCM3.1. If n*0.1 is greater than 8 and less than 28, the model of the vehicle ECU is DCM3.2.

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