CN114779740B - Vehicle fault remote diagnosis system and method - Google Patents
Vehicle fault remote diagnosis system and method Download PDFInfo
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- CN114779740B CN114779740B CN202210428546.1A CN202210428546A CN114779740B CN 114779740 B CN114779740 B CN 114779740B CN 202210428546 A CN202210428546 A CN 202210428546A CN 114779740 B CN114779740 B CN 114779740B
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- 238000004171 remote diagnosis Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000006870 function Effects 0.000 claims abstract description 28
- 238000003745 diagnosis Methods 0.000 claims description 115
- 238000012545 processing Methods 0.000 claims description 18
- 238000004891 communication Methods 0.000 claims description 13
- 238000004806 packaging method and process Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
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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
- G05B23/0259—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the response to fault detection
- G05B23/0262—Confirmation of fault detection, e.g. extra checks to confirm that a failure has indeed occurred
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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
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
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Abstract
本发明公开了一种车辆故障远程诊断系统及方法，该系统包括云端、与云端通信连接的车载终端，以及与车载终端通信连接的至少一个ECU；云端，用于发送诊断指令，对车载终端反馈的诊断数据进行处理；车载终端，用于采集车辆的诊断数据，并将采集的诊断数据发送至云端；ECU，用于实时获取车辆的诊断数据，反馈诊断报文至车载终端；车载终端包括MCU，以及与MCU通信连接的4G模块，MCU用于解析诊断指令，转化为CAN报文格式，接收对应ECU的诊断报文，并通过4G模块发送至云端。本发明解决了常规远程诊断功能的局限性，提高了诊断效率，降低了诊断成本。
The present invention discloses a vehicle fault remote diagnosis system and method, the system includes a cloud, a vehicle terminal connected to the cloud, and at least one ECU connected to the vehicle terminal; the cloud is used to send diagnostic instructions and process diagnostic data fed back by the vehicle terminal; the vehicle terminal is used to collect diagnostic data of the vehicle and send the collected diagnostic data to the cloud; the ECU is used to obtain the diagnostic data of the vehicle in real time and feed back diagnostic messages to the vehicle terminal; the vehicle terminal includes an MCU and a 4G module connected to the MCU, the MCU is used to parse the diagnostic instructions, convert them into CAN message format, receive the diagnostic message of the corresponding ECU, and send it to the cloud through the 4G module. The present invention solves the limitations of conventional remote diagnosis functions, improves diagnostic efficiency, and reduces diagnostic costs.
Description
Technical Field
The invention relates to the technical field of automobile fault diagnosis, in particular to a vehicle fault remote diagnosis system and method.
Background
With the development of economy and society, the automobile has more and more possession, and fault diagnosis of automobiles is becoming mature. The development of the automobile fault diagnosis technology enables the processing speed of automobile faults to be faster, in the existing automobile fault diagnosis technology, single functions can be realized, the state of the automobile cannot be monitored in real time, and fault diagnosis can be carried out only when a vehicle driver actively carries out fault detection.
The invention patent with publication number CN113325830A discloses a remote diagnosis method of an automobile diagnostic apparatus, which comprises the steps of sending corresponding diagnosis instructions on a bus through a TBOX of a vehicle-mounted network connection terminal, obtaining diagnosis responses given by a module and uploading the diagnosis responses to a remote diagnosis system, analyzing server contents by the TBOX, analyzing the diagnosis responses into corresponding CAN diagnosis commands, sending the CAN diagnosis commands to the CAN bus, receiving diagnosis reply contents of the module and uploading the diagnosis reply contents to the remote diagnosis system, and analyzing original messages by the remote diagnosis system according to a UDS protocol. According to the invention, the message analysis part is arranged on the cloud server for processing according to the UDS protocol, the design has limitation, the cloud can not issue complex diagnosis instructions, and the diagnosis failure possibly occurs because the instructions are not issued in time due to the network delay problem.
The utility model patent with the publication number of CN209946704U discloses a cloud diagnosis system for coping with vehicle faults, which comprises a vehicle-mounted terminal, a cloud server and a mobile client, wherein all components are communicated through a 4G network, the vehicle-mounted terminal is used for collecting vehicle information and sending collected data to the cloud server through the 4G network, meanwhile, the collected data are stored in a TF card and are accompanied with time stamps, the cloud server is used for logging in, logging out, receiving data, sending data and storing data and sending the data to the mobile client, and the mobile client is used for receiving the data sent by the cloud server, and a user receives the information and operates the information at the mobile client. The utility model only supports the reading of fault codes, and the single fault code reading cannot meet the increasing demands at present of higher and higher automobile electronization degree.
Today, conventional vehicle diagnostics typically take a vehicle to a 4S store, diagnose the vehicle with a fault diagnostic apparatus, and typically, the vehicle is in a significant fault condition before the driver is actively in the 4S store for maintenance. The vehicle remote on-line diagnosis system can remotely diagnose the vehicle faults on line and inform a driver of the faults of the vehicle and maintain the vehicle in time. Therefore, it is important to design a multifunctional, efficient and highly-expandable remote diagnostic program diagnosis system.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a vehicle fault remote diagnosis system and method, which solve the limitations of the conventional remote diagnosis function, improve the diagnosis efficiency and reduce the diagnosis cost.
In order to solve the technical problems, the invention adopts the following technical scheme:
a vehicle fault remote diagnosis system comprises a cloud end, a vehicle-mounted terminal in communication connection with the cloud end, and at least one ECU in communication connection with the vehicle-mounted terminal;
The cloud end is used for sending a diagnosis instruction and processing diagnosis data fed back by the vehicle-mounted terminal;
the vehicle-mounted terminal is used for collecting diagnostic data of the vehicle and sending the collected diagnostic data to the cloud;
the ECU is used for acquiring diagnosis data of the vehicle in real time and feeding back a diagnosis message to the vehicle-mounted terminal;
the vehicle-mounted terminal comprises an MCU and a 4G module in communication connection with the MCU, wherein the MCU is used for analyzing the diagnosis instruction, converting the diagnosis instruction into a CAN message format, receiving the diagnosis message corresponding to the ECU and sending the diagnosis message to the cloud through the 4G module.
Further, the MCU comprises a remote diagnosis APP layer, a remote diagnosis NL layer and a DRIVER layer;
The remote diagnosis APP layer is used for analyzing and processing diagnosis instructions of the cloud;
The remote diagnosis NL layer is used for converting the data packet sent by the remote diagnosis APP layer into a CAN message format, receiving an original message on a CAN network, packaging, unpacking and transmitting the original message back to the remote diagnosis APP layer;
and the DRIVER layer is used for processing and driving the CAN message and packaging the CAN message into a unified interface for the NL layer for remote diagnosis.
Further, the remote diagnosis APP layer is provided with a plurality of UDS service functions for processing corresponding UDS diagnosis services and matched UDS service function background tasks.
Further, the MCU and the 4G module are in communication connection through UART (Universal Asynchronous Receiver/Transmitter, asynchronous transceiver) or SPI (SERIAL PERIPHERAL INTERFACE ).
Further, the vehicle-mounted terminal is in communication connection with the ECU through a GW, and the GW is used for forwarding the CAN message so as to realize data forwarding.
Further, the MCU and the GW, and the GW and the ECU are in communication connection through CAN (Controller Area Network ).
The invention also provides a vehicle fault remote diagnosis method, which uses the vehicle fault remote diagnosis system and is characterized by comprising the following steps:
S1, the vehicle-mounted terminal receives a diagnosis instruction of the cloud through a 4G module and forwards the diagnosis instruction to the MCU;
S2, the MCU issues a diagnosis instruction to the CAN network and forwards the diagnosis instruction to the corresponding ECU through the GW;
S3, the ECU receives the diagnosis instruction and sends out a diagnosis message;
s4, the MCU receives the diagnosis message on the CAN network and sends the diagnosis message to the 4G module;
s5, the 4G module receives diagnosis data sent by the MCU and forwards the diagnosis data to the cloud;
And S6, the cloud processes the fed-back diagnosis data.
Further, in step S2, the MCU issues a diagnostic command to the CAN network, including the following steps:
S21, the MCU circularly detects a diagnosis instruction queue, and when a diagnosis instruction sent by the 4G module is received, enqueuing operation is carried out, and step S22 is executed;
S22, the MCU performs dequeuing operation, saves a current diagnosis instruction to be processed, judges whether the vehicle meets diagnosis conditions by reading CAN network signals, if so, executes S23, otherwise, feeds back information that the diagnosis conditions do not meet to the 4G module;
s23, calling a corresponding UDS service function, converting the UDS service function into a CAN message format, and transmitting the CAN message format to a CAN network.
Further, in step S4, the MCU receives the diagnostic message on the CAN network, and sends the diagnostic message to the 4G module, which includes the following steps:
s41, executing S42 when the cloud diagnosis instruction is functional addressing, otherwise executing S43;
S42, waiting for 5 seconds, if a diagnosis message fed back by the corresponding ECU is received, then waiting for 10 seconds, and then transmitting the received original diagnosis message group package to the 4G module, otherwise, feeding back corresponding ECU timeout information to the 4G module;
s43, waiting for 5 seconds, executing S44 if a diagnosis message fed back by the corresponding ECU is received, otherwise feeding back corresponding ECU timeout information to the 4G module;
S44, judging whether the cloud diagnosis instruction belongs to a specific UDS service function, if so, ending the processing flow, and otherwise, transmitting a corresponding ECU feedback message to the 4G module.
Compared with the prior art, the invention has the beneficial effects that:
1. The diagnosis instructions (single diagnosis instructions or a plurality of diagnosis instructions) are issued to the 4G module through the cloud, the 4G module forwards the diagnosis instructions to the MCU, the MCU caches the diagnosis instructions by using the data structure of the queue, the diagnosis instructions are sequentially resolved by adopting a software layered structure, the corresponding UDS service functions in the remote diagnosis APP layer are called, the resolved data are issued to the UDS network layer, the diagnosis instructions are sent to the CAN network after being processed, and CAN messages fed back by the corresponding ECU (controller) are returned to the cloud end layer by layer. Through the process, the cloud can read the fault code and the state code of each ECU (controller) of the vehicle and modify the data stored locally by each ECU, so that the limitation of the conventional remote diagnosis function is solved, the diagnosis efficiency is improved, and the diagnosis cost is reduced.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the overall structure of a vehicle fault remote diagnosis system according to the present invention;
FIG. 2 is a flow chart of a vehicle fault remote diagnostic system of the present invention;
FIG. 3 is a flow chart of a vehicle fault remote diagnosis method of the present invention;
fig. 4 is a flowchart of an MCU according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the present embodiment provides a vehicle fault remote diagnosis system, which includes a cloud end, a vehicle-mounted terminal communicatively connected to the cloud end, and at least one ECU (Electronic Control Unit, vehicle controller) communicatively connected to the vehicle-mounted terminal;
The cloud end is used for sending a diagnosis instruction and processing diagnosis data fed back by the vehicle-mounted terminal;
the vehicle-mounted terminal is used for collecting diagnostic data of the vehicle and sending the collected diagnostic data to the cloud;
the ECU is used for acquiring diagnosis data of the vehicle in real time and feeding back a diagnosis message to the vehicle-mounted terminal;
the vehicle-mounted terminal comprises an MCU (Micro Controller Unit, a micro control unit) and a 4G module in communication connection with the MCU, wherein the MCU is used for analyzing the diagnosis instruction, converting the diagnosis instruction into a CAN message format, receiving the diagnosis message corresponding to the ECU and sending the diagnosis message to the cloud through the 4G module.
Referring to fig. 2, in the system, a diagnosis instruction (a single diagnosis instruction or a plurality of diagnosis instructions) is issued to a 4G module through a cloud, the 4G module forwards the diagnosis instruction to an MCU, the MCU caches the diagnosis instruction by using a data structure of a queue, a software layered structure is adopted, the diagnosis instruction is sequentially parsed to call a corresponding UDS service function in a remote diagnosis APP layer, the parsed data is issued to a UDS network layer, the diagnosis instruction is sent to a CAN network after being processed, and then CAN messages fed back to the cloud layer by layer corresponding to an ECU (controller) are returned to the cloud.
In specific implementation, the MCU comprises a remote diagnosis APP layer, a remote diagnosis NL layer and a DRIVER layer;
The remote diagnosis APP layer is used for analyzing and processing the diagnosis instructions of the cloud, a state machine for managing and processing the diagnosis instructions is arranged in the remote diagnosis APP layer, the state machine is in an idle state at ordinary times, and the state machine enters the next state after receiving the diagnosis instructions of the cloud forwarded by the 4G module.
The remote diagnosis NL layer is integrated with codes of a network layer in the UDS protocol stack and is used for converting data sent by the remote diagnosis APP layer into a CAN message format, receiving an original message on the CAN network, packaging, unpacking and transmitting the original message back to the remote diagnosis APP layer, unpacking, removing a frame control head of the original CAN message, only preserving effective data, facilitating to simplify code logic of the remote diagnosis APP layer through the remote diagnosis NL layer, facilitating to maintain codes and improving portability.
The DRIVER layer is used for processing the driving, receiving the CAN message and packaging the CAN message into a unified interface for the NL layer for remote diagnosis.
In particular, the remote diagnostic APP layer has a plurality of UDS service functions for processing corresponding UDS diagnostic services, and the supporting UDS service functions process background tasks (periodic polling execution). While UDS service functions such as 10 service, 27 service, 3E service, 19 service, 22 service, 11 service, 14 service, 2E service, etc., each service corresponds to a diagnostic instruction of the vehicle, specific processing can be performed on specific services through the function pointer list, improving scalability.
In specific implementation, the MCU and the 4G module are in communication connection through UART (Universal Asynchronous Receiver/Transmitter, asynchronous transceiver) or SPI (SERIAL PERIPHERAL INTERFACE ).
In specific implementation, the vehicle-mounted terminal is in communication connection with the ECU through a Gateway (Gateway), and the GW is used for forwarding CAN messages to realize data forwarding.
In specific implementation, the MCU, the GW and other ECUs on the vehicle are in communication connection through CAN (Controller Area Network ).
Referring to fig. 3, the invention further provides a vehicle fault remote diagnosis method, which uses the vehicle fault remote diagnosis system, and comprises the following steps:
S1, the vehicle-mounted terminal receives a diagnosis instruction of the cloud through a 4G module and forwards the diagnosis instruction to the MCU;
S2, the MCU issues a diagnosis instruction to the CAN network, and the diagnosis instruction is received by the GW and forwarded to the corresponding ECU;
S3, the ECU receives the diagnosis instruction and sends out a diagnosis message;
s4, the MCU receives the diagnosis message on the CAN network and sends the diagnosis message to the 4G module;
s5, the 4G module forwards the diagnosis data sent by the MCU and forwards the diagnosis data to the cloud;
And S6, the cloud processes the fed-back diagnosis data.
Referring to fig. 4, in the implementation, in step S2, the MCU issues a diagnostic command to the CAN network, including the following steps:
S21, the MCU circularly detects a diagnosis instruction queue, and when a diagnosis instruction sent by the 4G module is received, enqueuing operation is carried out, and step S22 is executed;
s22, the MCU performs dequeuing operation, saves a current diagnosis instruction to be processed, judges whether the vehicle meets diagnosis conditions or not by reading CAN network signals, and judges signals such as vehicle speed, engine running state and the like, if the signals meet the diagnosis conditions, S23 is executed, otherwise, feedback diagnosis conditions do not meet the information and the information is sent to the 4G module;
S23, calling a corresponding UDS service function according to the diagnosis instruction, converting the UDS service function into a CAN message format through a remote diagnosis NL layer, and transmitting the CAN message format to a CAN network.
In the specific implementation, in step S4, the MCU receives the diagnostic message on the CAN network, and sends the diagnostic message to the 4G module, which includes the following steps:
s41, executing S42 when the cloud diagnosis instruction is functional addressing, otherwise executing S43;
S42, waiting for 5 seconds, if a diagnosis message fed back by the corresponding ECU is received, then waiting for 10 seconds, and then transmitting the received original diagnosis message group package to the 4G module, otherwise, feeding back corresponding ECU timeout information to the 4G module;
s43, waiting for 5 seconds, executing S44 if a diagnosis message fed back by the corresponding ECU is received, otherwise feeding back corresponding ECU timeout information to the 4G module;
S44, judging whether the cloud diagnosis instruction belongs to a specific UDS service function, if so, ending the processing flow, and otherwise, transmitting a corresponding ECU feedback message to the 4G module.
According to the invention, a cloud terminal issues a single diagnosis instruction or a plurality of diagnosis instructions to an MCU, a vehicle-mounted terminal receives the diagnosis instructions of the cloud terminal through a 4G module and forwards the diagnosis instructions to the MCU, and for specific diagnosis instructions, a UDS service function is arranged in a remote diagnosis APP layer and a background function corresponding to the UDS service function is specially processed.
For example, the cloud transmits a diagnosis instruction of function addressing, and because of limited memory resources of the MCU, the remote diagnosis NL layer can only process a diagnosis message of one ECU (controller) within a period of time, and transmits the function addressing, a plurality of ECUs feed back the diagnosis message, so that special treatment is required at this time. And after the functional addressing message is issued, if no feedback message is received within 5 seconds, replying to cloud service diagnosis overtime, if the feedback message is received, directly transmitting a fixed flow control frame when the MCU receives a first frame of the CAN message, not performing packet processing, re-timing for 10 seconds, and then transmitting the original message received within the period of time back to the cloud for processing.
For example, when the diagnosis instruction issued by the cloud is 2E service and the security level of the ECU is required, the cloud firstly caches a plurality of diagnosis instructions into a queue of the MCU in a mode of issuing the diagnosis instructions simultaneously, the diagnosis instructions are executed in one piece, the security constants of the ECUs are issued by the cloud, and the MCU receives the security constants and invokes a security encryption algorithm to generate a KEY, so that the security level of the opposite-end controller is unlocked, the corresponding UDS service is realized, and the limitation of the conventional remote diagnosis function is solved.
Finally, it is noted that the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and that although the present invention has been described with reference to the preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein. Obvious changes that are extended by the technical proposal of the invention are still within the scope of the invention.
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| CN115903744A (en) * | 2022-11-25 | 2023-04-04 | 北京一雄信息科技有限公司 | A remote vehicle detection method, device, electronic equipment and storage medium |
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