WO2019141114A1 - Procédé et dispositif de diagnostic de véhicule - Google Patents

Procédé et dispositif de diagnostic de véhicule Download PDF

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Publication number
WO2019141114A1
WO2019141114A1 PCT/CN2019/070886 CN2019070886W WO2019141114A1 WO 2019141114 A1 WO2019141114 A1 WO 2019141114A1 CN 2019070886 W CN2019070886 W CN 2019070886W WO 2019141114 A1 WO2019141114 A1 WO 2019141114A1
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WIPO (PCT)
Prior art keywords
communication protocol
voltage value
candidate communication
candidate
selected pin
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PCT/CN2019/070886
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English (en)
Chinese (zh)
Inventor
罗青华
瞿松松
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深圳市道通科技股份有限公司
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Publication of WO2019141114A1 publication Critical patent/WO2019141114A1/fr

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
    • G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols

Definitions

  • the present application relates to the field of automobile fault diagnosis technology, and in particular, to a vehicle diagnosis method and apparatus.
  • OBD On-Board Diagnostic
  • An OBD interface is provided on the car.
  • 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.
  • 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.
  • 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.
  • 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.
  • an embodiment of the present invention provides a vehicle diagnosis method, including:
  • the voltage characteristic of the level signal includes: a high level voltage value and/or a low level voltage value.
  • determining, according to the voltage characteristic, a candidate communication protocol related to the selected pin including:
  • 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;
  • 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;
  • the communication protocol is a candidate communication protocol.
  • 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:
  • a connection request signal based on one candidate communication protocol of the plurality of candidate communication protocols is sequentially sent to the selected pin;
  • 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 sending by the selected pin, a connection request signal based on the candidate communication protocol, including:
  • 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 further includes:
  • 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.
  • 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
  • the voltage characteristic of the level signal includes: a high level voltage value and/or a low level voltage value.
  • the determining module is specifically configured to:
  • 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;
  • 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;
  • the communication protocol is a candidate communication protocol.
  • the communication module is specifically configured to:
  • a connection request signal based on one candidate communication protocol of the plurality of candidate communication protocols is sequentially sent to the selected pin;
  • 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 communication module is specifically configured to:
  • 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 device further includes:
  • 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.
  • the device further includes:
  • 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.
  • an embodiment of the present invention provides a vehicle diagnostic apparatus, including:
  • 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.
  • 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 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.
  • 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.
  • FIG. 1 is a schematic diagram of an application scenario 1 provided by the present invention
  • FIG. 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. 6 is a schematic structural diagram of a vehicle diagnosis apparatus according to Embodiment 1 of the present invention.
  • FIG. 7 is a schematic structural diagram of a vehicle diagnosis apparatus according to Embodiment 2 of the present invention.
  • FIG. 8 is a schematic structural diagram of a vehicle diagnosis apparatus according to Embodiment 3 of the present invention.
  • FIG. 9 is a schematic structural diagram of a vehicle diagnosis apparatus according to Embodiment 1 of the present invention.
  • 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.
  • ECU Electronic Control Unit
  • 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.
  • FIG. 1 is a schematic diagram of an application scenario 1 provided by the present invention.
  • 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.
  • 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.
  • the vehicle diagnostic device 5 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.
  • 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.
  • FIG. 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.
  • 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.
  • 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.
  • the voltage characteristic includes a high level voltage value
  • 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;
  • the communication protocol is a candidate communication protocol.
  • the voltage characteristic obtained in this embodiment is an example of a high-level voltage value.
  • 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.
  • DLC Data Link Connector
  • the candidate communication protocol corresponding to 1.8V to 3.0V is the ISO15765-4 protocol or the SAE J1939 protocol.
  • the candidate communication protocol corresponding to 8.4V to 12.5V is the ISO9141-2 or ISO14230-4 protocol.
  • 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.
  • 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.
  • 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;
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the candidate communication protocol 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.
  • 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.
  • the candidate communication protocol related to each selected pin is obtained by acquiring the level signal of the OBD interface pin.
  • 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.
  • DLC Data Link Connector
  • 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.
  • the corresponding candidate communication protocol is determined by detecting the voltage characteristics of PIN6 and PIN2.
  • the candidate communication protocol associated with the PIN6 pin is the ISO15765-4 protocol or the SAE J1939 protocol.
  • 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.
  • 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.
  • PIN2 and PIN6 can be scanned in a parallel scan to determine the target communication protocol.
  • 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.
  • the candidate communication protocol on which the connection request signal is based is determined as the target communication protocol.
  • the selected pin is scanned by serial scanning.
  • 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.
  • the above five candidate communication protocols need to be scanned in order to determine the target communication protocol.
  • 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.
  • 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.
  • the two candidate protocols need to be scanned in turn to determine the target communication protocol.
  • multiple selected pins may be simultaneously scanned in parallel, or may be performed on a selected pin simultaneously in parallel scanning.
  • Serial scan 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.
  • step S103 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.
  • 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.
  • FIG. 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:
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • a function button called a one-button IM is separately designed on the diagnostic device.
  • 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.
  • 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.
  • a single interface is used to display all the basic information without using multiple interfaces, so that the diagnosis result is more clear.
  • 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.
  • 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;
  • the voltage characteristic of the level signal includes: a high level voltage value and/or a low level voltage value.
  • the determining module 20 is specifically configured to:
  • 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;
  • 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;
  • 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.
  • the communication module 30 is specifically configured to:
  • a connection request signal based on one candidate communication protocol of the plurality of candidate communication protocols is sequentially sent to the selected pin;
  • 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 communication module 30 is specifically configured to:
  • 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 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.
  • 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.
  • 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.
  • 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.
  • the processor and the storage medium may also reside as discrete components in the communication device.
  • 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.

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Traffic Control Systems (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

L'invention concerne un procédé et un dispositif de diagnostic de véhicule, le procédé consistant à : collecter un signal de niveau d'une broche sélectionnée dans des interfaces systèmes de diagnostic embarquées pour acquérir des caractéristiques de tension du signal de niveau (S101) ; conformément aux caractéristiques de tension, déterminer des protocoles de communication candidats associés à la broche sélectionnée (S102) ; envoyer un signal de demande de connexion sur la base des protocoles de communication candidats à la broche sélectionnée pour déterminer si un protocole de communication cible est présenté dans les protocoles de communication candidats (S103) ; si le protocole de communication cible est présenté, établir la communication entre le dispositif de diagnostic de véhicule et une unité de commande électronique, ECU, du véhicule sur la base du protocole de communication cible (S104). Le procédé et le dispositif de diagnostic de véhicule réduisent la quantité de protocole de balayage de broches d'interface OBD, améliorent l'efficacité de balayage et réduisent le temps de diagnostic de véhicule.
PCT/CN2019/070886 2018-01-16 2019-01-08 Procédé et dispositif de diagnostic de véhicule WO2019141114A1 (fr)

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CN110596627B (zh) * 2019-08-22 2021-09-03 深圳市鹏巨术信息技术有限公司 车辆诊断盒的检测方法及装置
CN110708489A (zh) * 2019-09-17 2020-01-17 浙江大华技术股份有限公司 通讯方法、装置以及电子设备、存储介质
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