WO2019141114A1 - Vehicle diagnosis method and device - Google Patents

Abstract

Provided are a vehicle diagnosis method and device, wherein the method comprises: collecting a level signal of a selected pin in a vehicle-mounted diagnosis system interfaces to acquire voltage characteristics of the level signal (S101); according to the voltage characteristics, determining candidate communication protocols associated with the selected pin (S102); sending a connection request signal based on the candidate communication protocols to the selected pin to determine whether a target communication protocol is presented in the candidate communication protocols (S103); if the target communication protocol is presented, establishing the communication between the vehicle diagnosis device and an electronic control unit ECU of the vehicle based on the target communication protocol (S104). The vehicle diagnosis method and device reduce the scanning protocol quantity of OBD interface pins, improve the scanning efficiency, and shorten the vehicle diagnosis time.

Description

Vehicle diagnosis method and device

The present application claims priority to Chinese Patent Application No. 20181003813, filed on Jan.

Technical field

The present application relates to the field of automobile fault diagnosis technology, and in particular, to a vehicle diagnosis method and apparatus.

Background technique

At present, most of the cars are equipped with On-Board Diagnostic (OBD). The OBD is mainly used to diagnose the state of the vehicle according to the operating conditions of the engine and the working state of the exhaust after-treatment system. It is highly versatile. The advantage of convenient diagnosis.

An OBD interface is provided on the car. Among them, each pin in the OBD interface is connected to each electronic control unit (ECU) in the vehicle based on different vehicle communication protocols. The vehicle diagnostic device can establish a connection with an ECU in the vehicle through the OBD interface. In the process of establishing a connection between the vehicle diagnostic device and the ECU through the OBD interface, it is generally required to determine the communication protocol with the ECU by sequentially scanning the pin corresponding to the ECU through various vehicle communication protocols. And communicating with the ECU based on the determined communication protocol to acquire information in the vehicle.

However, the sequential scanning method to determine the communication protocol with the ECU often takes a long time, and the scanning efficiency is low, which prolongs the time for the vehicle diagnostic device to establish a connection with the vehicle.

Summary of the invention

Embodiments of the present invention provide a vehicle diagnosis method and apparatus to shorten a time when a vehicle diagnosis apparatus establishes a connection with a vehicle.

In a first aspect, an embodiment of the present invention provides a vehicle diagnosis method, including:

Collecting a level signal of a selected pin in an interface of the onboard diagnostic system to obtain a voltage characteristic of the level signal;

Determining a candidate communication protocol associated with the selected pin based on the voltage characteristic;

Sending a connection request signal based on the candidate communication protocol to the selected pin to determine whether a target communication protocol exists in the candidate communication protocol;

If there is a target communication protocol, communication between the vehicle diagnostic device and the electronic control unit ECU of the vehicle is established based on the target communication protocol.

Optionally, the voltage characteristic of the level signal includes: a high level voltage value and/or a low level voltage value.

Optionally, determining, according to the voltage characteristic, a candidate communication protocol related to the selected pin, including:

If the voltage characteristic includes a high level voltage value, determining that the corresponding high voltage range includes the communication protocol of the high level voltage value as a candidate communication protocol; or

If the voltage characteristic includes a low-level voltage value, determining that the corresponding low-voltage range includes the communication protocol of the low-level voltage value as a candidate communication protocol; or

If the voltage characteristic includes a high level voltage value and a low level voltage value, determining that the corresponding high voltage range includes the high level voltage value, and the corresponding low voltage range includes the low level voltage value The communication protocol is a candidate communication protocol.

Optionally, the sending, by the selected pin, a connection request signal based on the candidate communication protocol to determine whether a target communication protocol exists in the candidate communication protocol, including:

When the number of candidate communication protocols is multiple, a connection request signal based on one candidate communication protocol of the plurality of candidate communication protocols is sequentially sent to the selected pin;

If a response signal for a connection request signal fed back through the selected pin is received, determining that a target communication protocol exists in the plurality of candidate communication protocols, and using the candidate communication protocol on which the connection request signal is based Target communication protocol.

Optionally, the sending, by the selected pin, a connection request signal based on the candidate communication protocol, including:

When a plurality of selected pins are multiple, a connection request signal corresponding to each selected pin is sent to the plurality of selected pins in parallel; wherein, the connection request signal corresponding to each selected pin is based on The candidate communication protocol associated with each selected pin.

Optionally, the method further includes:

Obtaining at least 2 data of the ECU;

Determining fault state information corresponding to each of the at least two data according to at least two data of the ECU.

Optionally, the method further includes:

The fault state information corresponding to each of the data is displayed on the display interface, where the fault state information includes: a fault light, a fault code number, and a sensor state.

In a second aspect, an embodiment of the present invention provides a vehicle diagnostic apparatus, including:

An acquisition module, configured to collect a level signal of a selected pin in an interface of the onboard diagnostic system, to obtain a voltage characteristic of the level signal;

a determining module, configured to determine a candidate communication protocol related to the selected pin according to the voltage characteristic;

a communication module, configured to send a connection request signal based on the candidate communication protocol to the selected pin to determine whether a target communication protocol exists in the candidate communication protocol;

If there is a target communication protocol, communication between the vehicle diagnostic device and the electronic control unit ECU of the vehicle is established based on the target communication protocol.

Optionally, the voltage characteristic of the level signal includes: a high level voltage value and/or a low level voltage value.

Optionally, the determining module is specifically configured to:

If the voltage characteristic includes a high level voltage value, determining that the corresponding high voltage range includes the communication protocol of the high level voltage value as a candidate communication protocol; or

If the voltage characteristic includes a low-level voltage value, determining that the corresponding low-voltage range includes the communication protocol of the low-level voltage value as a candidate communication protocol; or

If the voltage characteristic includes a high level voltage value and a low level voltage value, determining that the corresponding high voltage range includes the high level voltage value, and the corresponding low voltage range includes the low level voltage value The communication protocol is a candidate communication protocol.

Optionally, the communication module is specifically configured to:

When the number of candidate communication protocols is multiple, a connection request signal based on one candidate communication protocol of the plurality of candidate communication protocols is sequentially sent to the selected pin;

If a response signal for a connection request signal fed back through the selected pin is received, determining that a target communication protocol exists in the plurality of candidate communication protocols, and using the candidate communication protocol on which the connection request signal is based Target communication protocol.

Optionally, the communication module is specifically configured to:

When a plurality of selected pins are multiple, a connection request signal corresponding to each selected pin is sent to the plurality of selected pins in parallel; wherein, the connection request signal corresponding to each selected pin is based on The candidate communication protocol associated with each selected pin.

Optionally, the device further includes:

And an acquiring module, configured to acquire at least two pieces of data of the ECU; and determine fault state information corresponding to each of the at least two pieces of data according to at least two pieces of data of the ECU.

Optionally, the device further includes:

And a display module, configured to display, on the display interface, fault state information corresponding to each of the data, where the fault state information includes: a fault light, a fault code number, and a sensor state.

In a third aspect, an embodiment of the present invention provides a vehicle diagnostic apparatus, including:

Memory for storing programs;

a processor for executing the program stored by the memory, the processor for performing the method of any of the first aspects when the program is executed.

In a fourth aspect, an embodiment of the present invention provides a computer readable storage medium, comprising: instructions, when executed on a computer, causing a computer to perform the method of any of the first aspects.

The vehicle diagnosis method and device provided by the embodiment of the present invention obtains the voltage characteristic of the level signal by collecting the level signal of the selected pin in the interface of the onboard diagnostic system; determining and selecting according to the voltage characteristic a pin-related candidate communication protocol; sending a connection request signal based on the candidate communication protocol to the selected pin to determine whether a target communication protocol exists in the candidate communication protocol; if a target communication protocol exists, based on The target communication protocol establishes communication between the vehicle diagnostic device and the electronic control unit ECU of the vehicle. In the above manner, the number of communication protocols corresponding to the selected pins can be reduced, the time for establishing a connection with the ECU is shortened, and the connection efficiency is improved.

DRAWINGS

FIG. 1 is a schematic diagram of an application scenario 1 provided by the present invention;

2 is a flowchart of a vehicle diagnosis method according to Embodiment 1 of the present invention;

FIG. 3 is a schematic diagram of a scanning principle of a candidate communication protocol for a plurality of selected pins according to Embodiment 1 of the present invention; FIG.

4 is a flowchart of a vehicle diagnosis method according to Embodiment 2 of the present invention;

FIG. 5 is a schematic diagram of a display interface for fault diagnosis provided by the present invention; FIG.

FIG. 6 is a schematic structural diagram of a vehicle diagnosis apparatus according to Embodiment 1 of the present invention; FIG.

FIG. 7 is a schematic structural diagram of a vehicle diagnosis apparatus according to Embodiment 2 of the present invention; FIG.

FIG. 8 is a schematic structural diagram of a vehicle diagnosis apparatus according to Embodiment 3 of the present invention; FIG.

FIG. 9 is a schematic structural diagram of a vehicle diagnosis apparatus according to Embodiment 1 of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be described in conjunction with the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are part of the present invention. Embodiments, but not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In the following, some of the terms in this application are explained so as to be understood by those skilled in the art:

1) On-Board Diagnostic (OBD), On-Board Diagnostic II (OBD II), is used to monitor whether the working status of each system in the vehicle is abnormal. If abnormal, determine the corresponding Specific faults in the system and stored in the form of Diagnostic Trouble Codes (DTC). The system can perform self-diagnosis according to DTC, and repair or maintain the vehicle in time. OBD can also be equipped with OBD interface. The OBD interface can be connected with external vehicle diagnostic equipment, so that maintenance personnel can use the above equipment to read in time. Go to DTC and carry out repair and maintenance of the vehicle to reduce the time for manual diagnosis.

2) Electronic Control Unit (ECU), which is arranged in various systems of the vehicle, such as an engine system, an emission control system, a fuel system, etc.; it can communicate with the vehicle diagnostic device through the OBD interface. Wherein, the OBD interface may include a plurality of pins, and the ECU in each system may be connected to at least one of the OBD interfaces through a bus. The bus protocol used for connecting the corresponding pins of each system may be the same, and may be different, and is not limited herein.

The application scenario involved in the embodiment of the present application is described below with reference to FIG. 1 .

FIG. 1 is a schematic diagram of an application scenario 1 provided by the present invention. As shown in FIG. 1 , in this application scenario, the vehicle includes one or more systems 1 , such as an engine system, an emission control system, a fuel system, etc., and each of the ECUs 2 in each system passes through a bus and a corresponding pin in the OBD interface 3 . connection. The connection bus of the ECU in each system and the corresponding pin in the OBD interface may be the same, and may be different, and is not limited herein. The OBD interface 3 can be connected to the vehicle diagnostic device 5 via a connection line 4. Here, the vehicle diagnostic device 5 may include an original diagnostic device, a comprehensive platform diagnostic device, a terminal to which an application having a diagnostic function is installed, and the like, which is not limited herein. The OBD interface 3 may include 16 standard pins. Alternatively, the OBD interface 3 may include other types of pins, which are not limited herein.

Specifically, after the vehicle diagnostic device 5 establishes a physical connection with the OBD interface 3 through the connection line 4, the vehicle diagnostic device 5 performs a communication protocol scan on a certain pin of the OBD interface 3. Here, performing the communication protocol scanning means that a connection request is sent to the pin in sequence based on a communication protocol, and the pin can sequentially send the connection request to the corresponding system ECU through the bus until the vehicle diagnostic device 5 receives the pin. The response sent by the connection request for a certain communication protocol. Further, the vehicle diagnostic device can establish a communication connection with the system ECU based on the communication protocol to implement data communication.

However, in the above manner, multiple communication protocol scans on the pins often take a long time, the scanning efficiency is low, and the communication establishment time is prolonged.

Based on the above problems, the embodiments of the present application will be described below with reference to the accompanying drawings.

2 is a flowchart of a method for diagnosing a vehicle according to a first embodiment of the present invention. As shown in FIG. 2, the method in this embodiment may include:

S101. Collect a level signal of the selected pin in the interface of the onboard diagnostic system to obtain a voltage characteristic of the level signal.

In the embodiment of the present application, the selected pin may be a pin selected by the vehicle diagnostic device based on a preset condition, or may be any one of the OBD interfaces, which is not limited herein.

In this embodiment, the voltage characteristic of the level signal can be obtained by collecting a level signal when the selected pin is connected to the diagnostic device.

The voltage characteristic of the level signal may include: a high level voltage value and/or a low level voltage value.

S102. Determine a candidate communication protocol related to the selected pin according to the voltage characteristic.

In this embodiment, if the voltage characteristic includes a high level voltage value, determining that the corresponding high voltage range includes the communication protocol of the high level voltage value is a candidate communication protocol; or

If the voltage characteristic includes a low-level voltage value, determining that the corresponding low-voltage range includes the communication protocol of the low-level voltage value as a candidate communication protocol; or

If the voltage characteristic includes a high level voltage value and a low level voltage value, determining that the corresponding high voltage range includes the high level voltage value, and the corresponding low voltage range includes the low level voltage value The communication protocol is a candidate communication protocol.

Specifically, the voltage characteristic obtained in this embodiment is an example of a high-level voltage value.

It is assumed that the OBD interface is in the form of a DLC (Data Link Connector), and the definition and description of the 16 pins included in the OBD interface can be referred to the prior art, and will not be described here.

It is detected whether the high-level voltage value of the PIN6 pin is between 1.8V and 3.0V, and if so, it is determined that the candidate communication protocol corresponding to 1.8V to 3.0V is the ISO15765-4 protocol or the SAE J1939 protocol.

It is detected whether the high-level voltage value of the DLC PIN12 pin is between 1.8V and 3.0V, and if so, it is determined that the candidate communication protocol corresponding to 1.8V to 3.0V is the SAE J1939 protocol.

It is detected whether the high-level voltage value of the DLC PIN2 pin is between 3.8V and 5.5V. If so, it is determined that the candidate communication protocol corresponding to 3.8V to 5.5V is the SAE J1850 PWM protocol.

It is detected whether the high level voltage value of the DLC PIN2 pin is between 6.25V and 8.75V. If yes, it is determined that the candidate communication protocol corresponding to 6.25V to 8.75V is the SAE J1850 VPW protocol.

It is detected whether the high-level voltage value of the DLC PIN7 pin is between 3.8V and 5.5V, and if so, it is determined that the candidate communication protocol corresponding to 3.8V to 5.5V is the SAE J1708 protocol.

It is detected whether the high level voltage value of the DLC PIN7 pin is between 8.4V and 12.5V, and if so, it is determined that the candidate communication protocol corresponding to 8.4V to 12.5V is the ISO9141-2 or ISO14230-4 protocol.

Using the above method, a candidate communication protocol associated with the selected pin can be obtained. The judgment process of the candidate communication protocol using the low-level voltage value is similar to the above-described determination process of the high-level voltage value, and the description thereof will not be repeated here.

S103. Send a connection request signal based on the candidate communication protocol to the selected pin to determine whether a target communication protocol exists in the candidate communication protocol.

In this embodiment, a connection request signal based on the candidate communication protocol is sent to the selected pin, and if the selected pin receives the corresponding response signal, the candidate communication protocol is used as the target communication protocol. Optionally, when the candidate communication protocol is multiple, the connection request signal based on one candidate communication protocol of the multiple candidate communication protocols is sequentially sent to the selected pin;

If a response signal for a connection request signal fed back through the selected pin is received, determining that a target communication protocol exists in the plurality of candidate communication protocols, and using the candidate communication protocol on which the connection request signal is based Target communication protocol.

In the embodiment of the present application, the connection request signal is sequentially sent based on one of the multiple candidate protocols, which may also be understood as scanning the communication protocol or understanding serial scanning of the communication protocol.

Optionally, when there are multiple selected pins, the candidate communication protocol associated with each selected pin is determined based on the above manner. Further, a connection request signal corresponding to each selected pin is sent to the plurality of selected pins in parallel; wherein a connection request signal corresponding to each selected pin is based on each selected pin Related candidate communication protocols. Here, the connection request signal corresponding to each selected pin is transmitted in parallel, which can also be understood as parallel scanning of the communication protocol.

Hereinafter, the above method will be exemplified in conjunction with FIG. 3. Further description of serial scanning and parallel scanning is provided.

Specifically, FIG. 3 is a schematic diagram of a scanning principle of a candidate communication protocol for a plurality of selected pins according to Embodiment 1 of the present invention. In this embodiment, the serial scanning mode refers to: using one candidate communication protocol for each scan. After the end of the previous candidate communication protocol scan, the scanning of the next candidate communication protocol is started until the scanning of all candidate communication protocols is completed.

In this embodiment, when the selected selected pin in the OBD interface is scanned by the candidate communication protocol, the candidate communication protocol is used to send a connection request signal to the ECU connected to the selected pin, and when the ECU returns, When the feedback response signal of the request signal is connected, it is explained that data communication between the vehicle diagnostic device and the ECU connected to the selected pin can be established by the candidate communication protocol, and thus the candidate communication protocol is used as the target communication protocol.

Optionally, if the target communication protocol is multiple, all the target communication protocols are fed back to the user, and the user is reminded to select the final target communication protocol from the target communication protocol; and according to the received user confirmation information, the final Target communication protocol.

Specifically, taking the example shown in FIG. 3 as an example, the candidate communication protocol related to each selected pin is obtained by acquiring the level signal of the OBD interface pin.

It is assumed that the OBD interface is in the form of a DLC (Data Link Connector), and the definition and description of the 16 pins included in the OBD interface can be referred to the prior art, and will not be described here.

For example, according to most vehicle model statistics, it is determined that the PIN6 or PIN2 is usually connected to a preset system, such as an engine system, etc., and it can be determined that the PIN6 or PIN2 is the selected pin.

When it is determined that PIN6 and PIN2 are selected pins, the corresponding candidate communication protocol is determined by detecting the voltage characteristics of PIN6 and PIN2.

For example, if it is detected that the high level voltage value of the PIN6 pin is between 1.8V and 3.0V, it is determined that the candidate communication protocol associated with the PIN6 pin is the ISO15765-4 protocol or the SAE J1939 protocol.

It is detected that the high level voltage value of the PIN2 pin is between 3.8V and 5.5V, and it is determined that the candidate communication protocol related to the PIN2 pin is the SAE J1850 PWM protocol. It is detected whether the high level voltage value of the DLC PIN2 pin is between 6.25V and 8.75V. If yes, it is determined that the candidate communication protocol corresponding to 6.25V to 8.75V is the SAE J1850 VPW protocol.

Alternatively, the low level voltage of the selected pin can be detected, or the high level voltage or the low level voltage of the selected pin can be detected at the same time, which is not limited herein.

Further, PIN2 and PIN6 can be scanned in a parallel scan to determine the target communication protocol. For example, the connection request based on the relevant candidate protocol format is sent in a parallel manner, that is, the signal format of the connection request conforms to the protocol format of the candidate communication protocol. When a response signal of the connection request signal fed back through the selected pin is received, the candidate communication protocol on which the connection request signal is based is determined as the target communication protocol.

When a selected pin corresponds to multiple candidate communication protocols, the selected pin is scanned by serial scanning.

For example, when the selected pin is PIN6, the candidate communication protocol of the PIN6 pin of the DLC is determined by detecting the voltage characteristic of the PIN6: ISO15765-4 standard CAN protocol, ISO15765-4 standard CAN 250K protocol, ISO15765-4 extended CAN 500K protocol. ISO15765-4 extends CAN 250K protocol and SAE J1939 protocol. At this time, the above five candidate communication protocols need to be scanned in order to determine the target communication protocol. Specifically, the connection request based on the relevant candidate protocol format may be sent in a serial manner, that is, the signal format of the connection request conforms to the protocol format of the candidate communication protocol. Determining that a target communication protocol exists in the plurality of candidate communication protocols when receiving a response signal for a connection request signal fed back through the selected pin, and using the candidate communication protocol on which the connection request signal is based Target communication protocol.

For another example, when the selected pin is the PIN 7, the candidate communication protocol of the PIN 7 is determined to be ISO 14230-4 and ISO 9141-2 by detecting the voltage characteristics of the PIN 7. At this point, the two candidate protocols need to be scanned in turn to determine the target communication protocol.

It should be noted that, in this embodiment, when a candidate communication protocol scan is performed on a selected pin, multiple selected pins may be simultaneously scanned in parallel, or may be performed on a selected pin simultaneously in parallel scanning. Serial scan.

S104. If there is a target communication protocol, establish communication between the vehicle diagnostic device and the electronic control unit ECU of the vehicle based on the target communication protocol.

In this embodiment, after determining that the target communication protocol exists in step S103, based on the target communication protocol, data communication between the diagnostic device and the electronic control unit ECU of the vehicle is established through the selected pin, thereby acquiring data sent by the ECU, and the like. Information, and use this as a judgement.

In this embodiment, the voltage characteristic of the level signal is obtained by collecting a level signal of the selected pin in the interface of the onboard diagnostic system; and determining a candidate communication protocol related to the selected pin according to the voltage characteristic; Sending a connection request signal based on the candidate communication protocol to the selected pin to determine whether a target communication protocol exists in the candidate communication protocol; if there is a target communication protocol, establishing a car diagnostic device based on the target communication protocol Communication with the electronic control unit ECU of the vehicle. Thereby reducing the number of scanning protocols of the OBD interface pins, improving scanning efficiency and shortening the diagnosis time of the vehicle.

4 is a flowchart of a vehicle diagnosis method according to Embodiment 2 of the present invention. As shown in FIG. 4, the method in this embodiment may further include:

S201. Acquire at least two pieces of data of the ECU.

In this embodiment, the vehicle diagnostic device establishes communication with the ECU through the target communication protocol, and acquires at least two data of the ECU, wherein the data acquired from the ECU corresponds to the current state information of the ECU.

S202. Determine fault state information corresponding to each of the at least two data according to at least two pieces of data of the ECU.

In this embodiment, the current state information of the corresponding ECU can be obtained from the acquired at least two data, and whether the ECU has a fault is determined according to the current state information of the ECU.

Optionally, after acquiring the status information of the ECU, the fault status information corresponding to each data is displayed on the display interface, where the fault status information includes: a fault light, a fault code number, and a sensor status.

Specifically, the state information of all the ECUs can be displayed in a graphic and/or text form on a single display interface, thereby making the diagnosis result of the vehicle more intuitive and clear. FIG. 5 is a schematic diagram of a display interface for fault diagnosis provided by the present invention. As shown in FIG. 5, multiple detection results are shown in the figure, wherein the cross mark indicates that there is a fault, the check mark indicates normal, and the prohibition symbol indicates undetected.

For example, as shown in FIG. 5, MIL represents a fault light, wherein different display modes of the fault light icon, such as different display colors, indicate whether a fault state occurs. DTC or Pd DTC stands for DTC. The number of detected fault codes can be displayed. In Fig. 5, the number of fault codes is zero. MIS to EGR represent OBD standard sensors, for example, FUE stands for fuel sensor and AIR stands for air conditioner sensor.

Specifically, a function button called a one-button IM is separately designed on the diagnostic device. When the user presses the function button in any state, the diagnostic device will establish the ECU with the fastest speed using the method shown in FIG. 2. Communication, get some basic status information of the ECU. For example, the fault light, the number of fault codes, the sensor status, etc., and use the UI interface to display these status information, thereby helping the user to quickly locate the vehicle fault problem. Optionally, a graphical display manner may be used to display the detection result of each status information, for example, the status information is normally indicated by a tick, and the status information is abnormally represented by a cross. The name of each status information can also be represented by a corresponding simplified graph. In this embodiment, a single interface is used to display all the basic information without using multiple interfaces, so that the diagnosis result is more clear.

In this embodiment, the voltage characteristics of the selected pin are obtained by collecting and analyzing the level signal of the selected pin in the interface of the onboard diagnostic system; determining all candidate communication protocols that meet the voltage characteristic; using the candidate communication a protocol to scan the selected pin, determine a target communication protocol corresponding to the selected pin; establish data communication with the electronic control unit ECU of the vehicle through the target communication protocol, and acquire state information of the ECU, The status information of the ECU is output as a diagnosis result. Thereby reducing the number of scanning protocols of the OBD interface pins, improving scanning efficiency and shortening the diagnosis time of the vehicle.

FIG. 6 is a schematic structural diagram of a vehicle diagnosing device according to Embodiment 1 of the present invention. As shown in FIG. 6 , the device in this embodiment may include:

The acquisition module 10 is configured to collect a level signal of the selected pin in the interface of the onboard diagnostic system to obtain a voltage characteristic of the level signal;

a determining module 20, configured to determine, according to the voltage characteristic, a candidate communication protocol related to the selected pin;

The communication module 30 is configured to send a connection request signal based on the candidate communication protocol to the selected pin to determine whether a target communication protocol exists in the candidate communication protocol;

If there is a target communication protocol, communication between the vehicle diagnostic device and the electronic control unit ECU of the vehicle is established based on the target communication protocol.

Optionally, the voltage characteristic of the level signal includes: a high level voltage value and/or a low level voltage value.

Optionally, the determining module 20 is specifically configured to:

In the on-board diagnostic system OBD, a communication protocol in which the value of the high level voltage value ranges from the high level voltage value of the selected pin is used as a candidate communication protocol; or

In the on-board diagnostic system OBD, a communication protocol in which a range of low-level voltage values covers a low-level voltage value of the selected pin is used as a candidate communication protocol; or

In the on-board diagnostic system OBD, the value range of the high level voltage value covers the high level voltage value of the selected pin, and the value range of the low level voltage value covers the low voltage of the selected pin. A flat voltage value communication protocol is used as a candidate communication protocol.

Optionally, the communication module 30 is specifically configured to:

When the number of candidate communication protocols is multiple, a connection request signal based on one candidate communication protocol of the plurality of candidate communication protocols is sequentially sent to the selected pin;

If a response signal for a connection request signal fed back through the selected pin is received, determining that a target communication protocol exists in the plurality of candidate communication protocols, and using the candidate communication protocol on which the connection request signal is based Target communication protocol.

Optionally, the communication module 30 is specifically configured to:

When a plurality of selected pins are multiple, a connection request signal corresponding to each selected pin is sent to the plurality of selected pins in parallel; wherein, the connection request signal corresponding to each selected pin is based on The candidate communication protocol associated with each selected pin.

This embodiment can perform the technical solutions in the foregoing methods shown in FIG. 2 and FIG. 4 , and the implementation process and technical effects are similar to the foregoing methods, and details are not described herein again.

FIG. 7 is a schematic structural diagram of a vehicle diagnostic apparatus according to Embodiment 2 of the present invention. As shown in FIG. 7, the apparatus in this embodiment may further include:

The obtaining module 40 is configured to acquire at least two pieces of data of the ECU, and determine fault state information corresponding to each of the at least two pieces of data according to at least two pieces of data of the ECU.

This embodiment can perform the technical solutions in the foregoing methods shown in FIG. 2 and FIG. 4 , and the implementation process and technical effects are similar to the foregoing methods, and details are not described herein again.

FIG. 8 is a schematic structural diagram of a vehicle diagnosing device according to Embodiment 3 of the present invention. As shown in FIG. 8 , the device in this embodiment may further include:

The display module 50 is configured to display fault state information corresponding to each data on the display interface, where the fault state information includes: a fault light, a fault code number, and a sensor state.

This embodiment can perform the technical solutions in the foregoing methods shown in FIG. 2 and FIG. 4 , and the implementation process and technical effects are similar to the foregoing methods, and details are not described herein again.

FIG. 9 is a schematic structural diagram of a vehicle diagnosing device according to Embodiment 1 of the present invention. As shown in FIG. 9, the device in this embodiment includes:

a memory 60 for storing a program;

a processor 70, configured to execute the program stored by the memory 60, when the program is executed, the processor 70 is configured to execute

The communication interface 80 is configured to be connected to the OBD interface of the vehicle through a connection line.

The memory 60, the processor 70 and the communication interface 80 can be connected by a bus coupling. The processor 70 can communicate with the vehicle by controlling the communication interface 80.

This embodiment can perform the technical solutions in the foregoing methods shown in FIG. 2 and FIG. 4 , and the implementation process and technical effects are similar to the foregoing methods, and details are not described herein again.

The vehicle diagnostic device or the vehicle diagnostic device in the embodiment of the present application may be a vehicle diagnostic interface device, or a vehicle diagnostic device or a user terminal installed with a diagnostic program.

In addition, the embodiment of the present application further provides a computer readable storage medium to perform the method described in any of the foregoing embodiments of FIG. 2 and FIG. Computer-executable storage medium stores computer-executable instructions that, when executed by at least one processor of a user device, execute the various possible methods described above.

Wherein, the computer readable medium comprises a computer storage medium and a communication medium, wherein the communication medium comprises any medium that facilitates transfer of the computer program from one location to another. A storage medium may be any available media that can be accessed by a general purpose or special purpose computer. An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a vehicle diagnostic device. Of course, the processor and the storage medium may also reside as discrete components in the communication device.

One of ordinary skill in the art will appreciate that all or part of the steps to implement the various method embodiments described above may be accomplished by hardware associated with the program instructions. The aforementioned program can be stored in a computer readable storage medium. The program, when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims (10)

A vehicle diagnosis method, comprising: Collecting a level signal of a selected pin in an interface of the onboard diagnostic system to obtain a voltage characteristic of the level signal; Determining a candidate communication protocol associated with the selected pin based on the voltage characteristic; Sending a connection request signal based on the candidate communication protocol to the selected pin to determine whether a target communication protocol exists in the candidate communication protocol; If there is a target communication protocol, communication between the vehicle diagnostic device and the electronic control unit ECU of the vehicle is established based on the target communication protocol. The method according to claim 1, wherein the voltage characteristic of the level signal comprises: a high level voltage value and/or a low level voltage value. The method of claim 2, wherein the determining a candidate communication protocol associated with the selected pin based on the voltage characteristic comprises: If the voltage characteristic includes a high level voltage value, determining that the corresponding high voltage range includes the communication protocol of the high level voltage value as a candidate communication protocol; or If the voltage characteristic includes a low-level voltage value, determining that the corresponding low-voltage range includes the communication protocol of the low-level voltage value as a candidate communication protocol; or If the voltage characteristic includes a high level voltage value and a low level voltage value, determining that the corresponding high voltage range includes the high level voltage value, and the corresponding low voltage range includes the low level voltage value The communication protocol is a candidate communication protocol. The method according to claim 1, wherein the sending a connection request signal based on the candidate communication protocol to the selected pin to determine whether a target communication protocol exists in the candidate communication protocol comprises: When the number of candidate communication protocols is multiple, a connection request signal based on one candidate communication protocol of the plurality of candidate communication protocols is sequentially sent to the selected pin; If a response signal for a connection request signal fed back through the selected pin is received, determining that a target communication protocol exists in the plurality of candidate communication protocols, and using the candidate communication protocol on which the connection request signal is based Target communication protocol. The method according to any one of claims 1 to 4, wherein the sending a connection request signal based on the candidate communication protocol to the selected pin comprises: When a plurality of selected pins are multiple, a connection request signal corresponding to each selected pin is sent to the plurality of selected pins in parallel; wherein, the connection request signal corresponding to each selected pin is based on The candidate communication protocol associated with each selected pin. The method according to any one of claims 1 to 5, wherein the method further comprises: Obtaining at least 2 data of the ECU; Determining fault state information corresponding to each of the at least two data according to at least two data of the ECU. The method of claim 6 wherein the method further comprises: The fault state information corresponding to each of the data is displayed on the display interface, where the fault state information includes: a fault light, a fault code number, and a sensor state. A vehicle diagnostic device, comprising: An acquisition module, configured to collect a level signal of a selected pin in an interface of the onboard diagnostic system, to obtain a voltage characteristic of the level signal; a determining module, configured to determine a candidate communication protocol related to the selected pin according to the voltage characteristic; a communication module, configured to send a connection request signal based on the candidate communication protocol to the selected pin to determine whether a target communication protocol exists in the candidate communication protocol; If there is a target communication protocol, communication between the vehicle diagnostic device and the electronic control unit ECU of the vehicle is established based on the target communication protocol. The apparatus according to claim 8, wherein the voltage characteristic of said level signal comprises: a high level voltage value and/or a low level voltage value. The apparatus according to claim 9, wherein said determining module is specifically configured to: If the voltage characteristic includes a high level voltage value, determining that the corresponding high voltage range includes the communication protocol of the high level voltage value as a candidate communication protocol; or If the voltage characteristic includes a low-level voltage value, determining that the corresponding low-voltage range includes the communication protocol of the low-level voltage value as a candidate communication protocol; or If the voltage characteristic includes a high level voltage value and a low level voltage value, determining that the corresponding high voltage range includes the high level voltage value, and the corresponding low voltage range includes the low level voltage value The communication protocol is a candidate communication protocol.

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