CN113093687A - Fault diagnosis system and method based on domain controller - Google Patents
Fault diagnosis system and method based on domain controller Download PDFInfo
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Abstract
The invention discloses a fault diagnosis system and method based on a domain controller, wherein the system comprises: the system comprises a main domain controller, a plurality of sub-domain controllers, a plurality of electronic control units and a diagnosis interface; the electronic control unit is used for generating a bus signal according to the current fault state and a preset fault signal definition value when a fault occurs, and generating an event frame message according to the bus signal so as to send n frames of event frame messages to the corresponding sub-domain controller; the sub-domain controller is used for acquiring a bus signal according to the n-frame event frame message when receiving the n-frame event frame message sent by any electronic control unit, and performing fault confirmation and fault information management on the electronic control unit according to the bus signal; the diagnosis interface is used for connecting diagnosis equipment; the diagnosis equipment is used for diagnosing any sub-domain controller so as to correspondingly process the fault information. The invention can effectively reduce the diagnosis efficiency of the vehicle-mounted ECU and save the diagnosis time and cost of the ECU of the whole vehicle.
Description
Technical Field
The invention relates to the technical field of automobile fault diagnosis, in particular to a fault diagnosis system and method based on a domain controller.
Background
The vehicle-mounted ECU is a brain of the vehicle, and mainly comprises a microprocessor (such as a CPU), a memory (such as a ROM and a RAM), an input/output interface (I/O), an analog-to-digital converter (a/D), a large-scale integrated circuit for shaping, driving and the like, so that the fault diagnosis of the vehicle-mounted ECU is important to ensure the normal operation of the vehicle.
At present, the design of the fault diagnosis function of an automobile is to face each ECU, that is, the vehicle-mounted ECUs are diagnosed independently, but the number of ECUs of the whole automobile is increased, if all ECUs of the whole automobile are diagnosed once, a long time and high cost are needed, for example, when the whole automobile has 160 ECUs, corresponding software codes, design, adjustment, verification and the like must be written for each ECU; meanwhile, in the process, a professional diagnostic instrument or a professional is needed to judge the fault, and the fault diagnosis efficiency is greatly reduced for a huge vehicle-mounted system of the whole vehicle.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a domain controller-based fault diagnosis system and method, which can effectively reduce the diagnosis efficiency of a vehicle-mounted ECU and save the time and cost for vehicle ECU diagnosis.
In order to solve the above technical problem, an embodiment of the present invention provides a domain controller-based fault diagnosis system, including: the system comprises a main domain controller, a plurality of sub-domain controllers, a plurality of electronic control units and a diagnosis interface; the sub-domain controller is connected with and communicates with the main domain controller through an Ethernet; the electronic control unit and the diagnosis interface are respectively connected and communicated with the main domain controller through a whole vehicle bus; the sub-domain controller correspondingly controls at least one electronic control unit; wherein,
the electronic control unit is used for generating a bus signal according to the current fault state and a preset fault signal definition value when a fault occurs, and generating an event frame message according to the generated bus signal so as to send n frames of event frame messages to the corresponding sub-domain controller; wherein n > 1;
the sub-domain controller is used for acquiring a corresponding bus signal according to the n-frame event frame message when receiving the n-frame event frame message sent by any electronic control unit controlled in the corresponding domain through the main domain controller, and performing fault confirmation and fault information management on the electronic control unit according to the acquired bus signal; wherein the fault information comprises a DTC fault code;
the diagnosis interface is used for connecting diagnosis equipment; the diagnostic equipment is used for diagnosing any sub-domain controller through the main domain controller so as to correspondingly process the fault information.
Further, the sub-domain controller is specifically configured to perform fault confirmation on the electronic control unit according to the obtained state information of the bus signal, and store fault information of the electronic control unit after a fault is confirmed; wherein the state information at least comprises a signal length, a signal name and a signal definition value of the bus signal.
Further, the sub-domain controller is specifically configured to manage fault information of the electronic control unit controlled in a corresponding domain through a preset fault DTC table; the fault DTC table at least comprises ID information, name information, message sending period, message length and DTC fault codes of the electronic control unit.
Further, the main domain controller and the sub domain controller are previously assigned with diagnostic IDs; the diagnostic device is specifically configured to identify the main domain controller and the sub domain controller by the diagnostic ID, and diagnose any one of the sub domain controllers by the main domain controller to read or/and clear the fault information.
Further, the electronic control unit comprises at least one of: the system comprises a PEPS control unit, an FDCM control unit, a BCM control unit, a VCU control unit, a BMS control unit and a TBOX communication module.
In order to solve the above technical problem, an embodiment of the present invention further provides a fault diagnosis method based on a domain controller, which is applicable to any one of the above fault diagnosis systems based on a domain controller; the method comprises the following steps:
when the electronic control unit fails, generating a bus signal according to the current fault state and a preset fault signal definition value, and generating an event frame message according to the generated bus signal so as to send n frames of event frame messages to the corresponding sub-domain controller; wherein n > 1;
when the sub-domain controller receives n frames of event frame messages sent by any electronic control unit controlled in the corresponding domain through the main domain controller, the sub-domain controller acquires corresponding bus signals according to the n frames of event frame messages, and performs fault confirmation and fault information management on the electronic control unit according to the acquired bus signals; wherein the fault information comprises a DTC fault code;
and the diagnosis equipment diagnoses any one sub-domain controller through the main domain controller so as to correspondingly process the fault information.
Further, the sub-domain controller performs fault confirmation and fault information management on any one of the electronic control units controlled in the corresponding domain through the following steps:
carrying out fault confirmation on the electronic control unit according to the obtained state information of the bus signal, and storing fault information of the electronic control unit after the fault is confirmed; wherein the state information at least comprises a signal length, a signal name and a signal definition value of the bus signal.
Further, the sub-domain controller manages fault information of any one of the electronic control units controlled in the corresponding domain by the following steps:
managing the fault information of the electronic control unit controlled in the corresponding domain through a preset fault DTC table; the fault DTC table at least comprises ID information, name information, message sending period, message length and DTC fault codes of the electronic control unit.
Further, the main domain controller and the sub domain controller are previously assigned with diagnostic IDs; the diagnosis equipment diagnoses any sub-domain controller to correspondingly process the fault information by the following steps:
and identifying the main domain controller and the sub domain controller through the diagnosis ID, and diagnosing any sub domain controller through the main domain controller so as to read or/and clear the fault information.
Further, the electronic control unit comprises at least one of: the system comprises a PEPS control unit, an FDCM control unit, a BCM control unit, a VCU control unit, a BMS control unit and a TBOX communication module.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
each electronic control unit is connected with the main domain controller through a whole vehicle bus, each sub-domain controller is connected and communicated with the main domain controller through an Ethernet, each electronic control unit and the diagnosis interface are respectively connected and communicated with the main domain controller through the whole vehicle bus, each sub-domain controller correspondingly controls at least one electronic control unit, wherein the main domain controller is equivalent to a gateway, the sub-domain controller carries out fault confirmation and fault information management on the electronic control units controlled in the corresponding domain through the main domain controller, and the diagnosis equipment can diagnose the sub-domain controllers and process the fault information at the same time only through the diagnosis interface and the main domain controller, thereby realizing the functions of the sub-domain controllers and the fault diagnosis of the electronic control units controlled in the corresponding domain without arranging a fault diagnosis module for each single sub-domain controller, the diagnosis efficiency of the vehicle-mounted ECU can be effectively improved, the time and the cost for diagnosing the vehicle ECU are saved, meanwhile, the sub-modules of the electronic control unit and the like do not need the requirement of EEPROM storage, the unified interface for providing fault diagnosis service by the sub-domain controller of the corresponding domain can be realized, so that more abnormal fault judgment can be realized, the complexity of fault diagnosis of the sub-modules of the electronic control unit and the like can be reduced, wider fault diagnosis can be realized, the diagnosis data of the system can be uniformly managed through the sub-domain controller, and the reliable visual data of the system can be provided for users, such as good, better, common and poor states.
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In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a preferred embodiment of a domain controller-based fault diagnosis system provided by the present invention;
FIG. 2 is a schematic structural diagram of another preferred embodiment of a domain controller-based fault diagnosis system provided by the present invention;
fig. 3 is a flowchart of a domain controller-based fault diagnosis method according to a preferred embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.
Referring to fig. 1, it is a schematic structural diagram of a preferred embodiment of a domain controller-based fault diagnosis system provided by the present invention, and the system includes: the system comprises a main domain controller, a plurality of sub-domain controllers, a plurality of electronic control units and a diagnosis interface; the sub-domain controller is connected with and communicates with the main domain controller through an Ethernet; the electronic control unit and the diagnosis interface are respectively connected and communicated with the main domain controller through a whole vehicle bus; the sub-domain controller correspondingly controls at least one electronic control unit; wherein,
the electronic control unit is used for generating a bus signal according to the current fault state and a preset fault signal definition value when a fault occurs, and generating an event frame message according to the generated bus signal so as to send n frames of event frame messages to the corresponding sub-domain controller; wherein n > 1;
the sub-domain controller is used for acquiring a corresponding bus signal according to the n-frame event frame message when receiving the n-frame event frame message sent by any electronic control unit controlled in the corresponding domain through the main domain controller, and performing fault confirmation and fault information management on the electronic control unit according to the acquired bus signal; wherein the fault information comprises a DTC fault code;
the diagnosis interface is used for connecting diagnosis equipment; the diagnostic equipment is used for diagnosing any sub-domain controller through the main domain controller so as to correspondingly process the fault information.
Specifically, the main domain controller is equivalent to a gateway, each sub-domain controller (for example, the sub-domain controller 1, the sub-domain controller 2, and the sub-domain controller 3 in fig. 1) is connected and communicated with the main domain controller through an ethernet, each electronic control unit (for example, the electronic control unit 1, the electronic control unit 2, the electronic control unit 3, the electronic control unit 4, and the electronic control unit 5 in fig. 1) is connected and communicated with the main domain controller through a finished vehicle bus (for example, a CAN bus), the diagnostic interface is connected and communicated with the main domain controller through the finished vehicle bus, and at least one electronic control unit is correspondingly controlled in a corresponding domain of each sub-domain controller; for any electronic control unit, when the electronic control unit has a fault, the electronic control unit generates a corresponding bus signal according to the current fault state and a preset fault signal definition value, encapsulates the generated bus signal into a corresponding event frame message, and sends n frame event frame messages to a sub-domain controller which controls the electronic control unit; for any sub-domain controller, when the sub-domain controller receives n frames of event frame messages sent by any electronic control unit controlled in a corresponding domain through a main domain controller, the sub-domain controller analyzes the received n frames of event frame messages and correspondingly obtains bus signals of the electronic control unit, so that fault confirmation and fault information management are carried out on the electronic control unit according to the obtained bus signals, wherein the fault information comprises a DTC fault code; the diagnostic equipment is connected to the fault diagnosis system through the diagnostic interface, and diagnoses any one sub-domain controller in the fault diagnosis system through the diagnostic protocol and the main domain controller so as to correspondingly process fault information in the sub-domain controller.
In the embodiment of the invention, each electronic control unit is connected to a main domain controller through a CAN bus network, each sub-domain controller is connected to the main domain controller through an Ethernet, and the main domain controller is equivalent to a gateway and used for forwarding data transmitted between the electronic control unit and the sub-domain controller.
It should be noted that each electronic control unit is preset with a fault signal definition value, for example, a certain bit is "0" to indicate no fault occurs, and a bit is "1" to indicate fault occurrence, and each time a fault occurs, a corresponding bus signal is generated according to the current fault state and the preset fault signal definition value, and the bus signal is encapsulated into a corresponding event frame message, and n frames (for example, n is 3) of event frame messages are sent to the corresponding sub-domain controller, and the messages are cleared each time the sub-domain controller wakes up.
In addition, the structure and the specific model of the diagnostic device are not specifically limited in the embodiment of the present invention, and the diagnostic device may be, for example, an existing Gryphon S3 vehicle-mounted diagnostic apparatus, an OBD vehicle-mounted diagnostic apparatus, or the like.
The fault diagnosis system based on the domain controller provided by the embodiment of the invention is characterized in that an electronic control unit is connected to a main domain controller through a whole vehicle bus, a sub-domain controller is connected and communicated with the main domain controller through an Ethernet, the electronic control unit and a diagnosis interface are respectively connected and communicated with the main domain controller through the whole vehicle bus, and the sub-domain controller correspondingly controls at least one electronic control unit, wherein the main domain controller is equivalent to a gateway, the sub-domain controller performs fault confirmation and fault information management on the electronic control unit controlled in a corresponding domain through the main domain controller, and a diagnosis device can simultaneously diagnose the sub-domain controller and process fault information only through the diagnosis interface and the main domain controller, thereby realizing the functions of the sub-domain controller and the fault diagnosis of the electronic control unit controlled in the corresponding domain without setting a fault diagnosis module for each single sub-domain controller, the diagnosis efficiency of the vehicle-mounted ECU can be effectively improved, the time and the cost for diagnosing the whole vehicle ECU are saved, meanwhile, the sub-modules of the electronic control unit and the like do not need the requirement of EEPROM storage, and the unified interface for providing fault diagnosis service by the sub-domain controller of the corresponding domain can be realized, so that more abnormal fault judgment can be realized, the complexity of fault diagnosis of the sub-modules of the electronic control unit and the like can be reduced, and the fault diagnosis in a wider range can be realized.
In another preferred embodiment, the sub-domain controller is specifically configured to perform fault confirmation on the electronic control unit according to the obtained status information of the bus signal, and store fault information of the electronic control unit after confirming a fault; wherein the state information at least comprises a signal length, a signal name and a signal definition value of the bus signal.
Specifically, with reference to the foregoing embodiment, after obtaining the corresponding bus signal from the n-frame event frame messages through parsing, each sub-domain controller performs fault confirmation on the electronic control unit that sends the n-frame event frame messages according to the state information of the bus signal, and stores the fault information of the electronic control unit after confirming the fault.
It should be noted that the state information of the bus signal at least includes the signal length, the signal name, and the signal definition value of the bus signal, for example, whether the corresponding electronic control unit fails or not may be determined according to the signal definition value in the bus signal, and which failure the corresponding electronic control unit sends may be determined according to the signal name in the bus signal; for example, the part of the control signals generated by the BCM are shown in table 1.
Table 1 partial bus signal table
In another preferred embodiment, the sub-domain controller is specifically configured to manage fault information of the electronic control units controlled in a corresponding domain through a preset fault DTC table; the fault DTC table at least comprises ID information, name information, message sending period, message length and DTC fault codes of the electronic control unit.
Specifically, with reference to the foregoing embodiment, after determining that any one electronic control unit controlled in the corresponding domain has a fault, the sub-domain controller manages fault information of the electronic control unit according to a preset fault DTC table, for example, the fault information is correspondingly stored in the fault DTC table and is correspondingly recorded as a current fault, and after each sleep wake-up, all the fault information is history fault information.
It should be noted that the fault DTC table at least includes ID information, name information, message sending period, message length, and DTC fault code of the electronic control unit controlled in the corresponding domain of each sub-domain controller; for example, the partial failure DTC table is shown in table 2.
TABLE 2 partial failure DTC Table
| Serial number | Sending ID | ECU name | Message sending period | Message length | DTC fault code |
| 1 | 0x400 | PEPS | Event type | 8BYTE | * |
| 2 | 0x401 | FDCM | Event type | 8BYTE | * |
| 3 | 0x402 | BCM | Event type | 8BYTE | * |
| 4 | 0x403 | VCU | Event type | 8BYTE | * |
| 5 | 0x404 | BMS | Event type | 8BYTE | * |
In another preferred embodiment, the main domain controller and the sub domain controller are pre-assigned with diagnostic IDs; the diagnostic device is specifically configured to identify the main domain controller and the sub domain controller by the diagnostic ID, and diagnose any one of the sub domain controllers by the main domain controller to read or/and clear the fault information.
Specifically, with reference to the foregoing embodiment, the main domain controller and each sub-domain controller are pre-assigned with a diagnostic ID, and the diagnostic device may identify the main domain controller and each sub-domain controller through the diagnostic ID, and diagnose any one sub-domain controller through the main domain controller after the identification, so as to read or/and clear the fault information stored in the sub-domain controller, where the diagnostic protocol used by the diagnostic device is a fault diagnostic protocol commonly used in the prior art, and is not described in detail again.
It CAN be understood that the main domain controller may also identify each sub-domain controller by the diagnostic ID, and assign a corresponding transmission ID to the event frame message reported to the CAN bus by the electronic control unit, so that the sub-domain controller obtains the event frame message of the transmission ID after detecting the transmission ID corresponding to the electronic control unit controlled in the corresponding domain, thereby ensuring correct communication between the sub-domain controller and the electronic control unit.
For example, the diagnostic IDs of the main domain controller and the partial sub-domain controllers are shown in table 3, the main domain controller may determine the sub-domain controller that needs the diagnostic function according to the assigned diagnostic ID, and taking the data in table 3 as an example, when the main domain controller detects the data containing 0x7E1 and/or 0x4E1, the sub-domain controller that sends the data is identified as sub-domain controller 1.
TABLE 3 diagnostic IDs of Master Domain controller and partial sub Domain controllers
| Serial number | Sending ID | ReceivingID | ECU name |
| 1 | 0x7E0 | 0x4E0 | Master domain controller |
| 2 | 0x7E1 | 0x4E1 | Sub-domain controller 1 |
| 3 | 0x7E2 | 0x4E2 | Sub-domain controller 2 |
| 4 | 0x7E3 | 0x4E3 | Sub-domain controller 3 |
Referring to fig. 2, which is a schematic structural diagram of another preferred embodiment of the fault diagnosis system based on the domain controller provided by the present invention, as an improvement of the above solution, the electronic control unit includes at least one of the following: the system comprises a PEPS control unit, an FDCM control unit, a BCM control unit, a VCU control unit, a BMS control unit and a TBOX communication module.
Specifically, in combination with the above embodiments, a plurality of Electronic Control Units (ECUs) are disposed in the vehicle network topology, for example, a PEPS Control Unit (i.e., Passive Entry Passive Start, keyless Entry and Start system), an FDCM Control Unit (i.e., a vehicle door Control module), a BCM Control Unit (i.e., a vehicle body Control module), a VCU Control Unit (i.e., a vehicle Control module), a BMS Control Unit (i.e., a power management Control system), a TBOX communication module, and the like.
It can be understood that a plurality of sub-domain controllers, such as a vehicle body domain controller, a power domain controller, an auxiliary driving domain controller, an entertainment domain controller and the like, are further arranged in the overall vehicle network topology architecture, and each sub-domain controller governs at least one electronic control unit, such as a vehicle body sub-domain controller for controlling and managing the BCM control unit.
In an alternative embodiment, shown in fig. 2, the system further includes a TBOX or V2X module (information display field), a cloud server; the TBOX or V2X module is connected with and communicated with the main domain controller through a CAN bus; the TBOX or V2X module is connected and communicated with the cloud server through a mobile network; the cloud server is connected and communicated with a secure client (such as a mobile phone, a computer and other equipment) through a secure internet channel, and is connected and communicated with a third-party client (such as a car owner mobile phone) through a mobile network.
Data received by the main domain controller can be uploaded to a cloud server through a TBOX or V2X module to be shared by a security client or a third-party client, such as a mobile phone of an owner of the automobile and a security client of an automobile developer, so that the owner of the automobile or a technician in automobile research and development can remotely check fault information, operation information and the like of the automobile, and the automobile can also communicate with other automobiles, a base station and the like through the TBOX or V2X module to realize information exchange between the automobile and the outside.
Referring to fig. 3, it is a flowchart of a preferred embodiment of a fault diagnosis method based on a domain controller according to the present invention, which is applicable to any one of the fault diagnosis systems based on a domain controller described above; the method comprises steps S11 to S13:
step S11, when the electronic control unit has a fault, generating a bus signal according to the current fault state and a preset fault signal definition value, and generating an event frame message according to the generated bus signal so as to send n frame event frame messages to the corresponding sub-domain controller; wherein n > 1;
step S12, when the sub-domain controller receives n frames of event frame messages sent by any electronic control unit controlled in the corresponding domain through the main domain controller, the sub-domain controller acquires corresponding bus signals according to the n frames of event frame messages, and performs fault confirmation and fault information management on the electronic control unit according to the acquired bus signals; wherein the fault information comprises a DTC fault code;
and step S13, the diagnostic device diagnoses any one of the sub-domain controllers through the main domain controller, so as to perform corresponding processing on the fault information.
Specifically, a main domain controller of the fault diagnosis system is equivalent to a gateway, each sub-domain controller is connected and communicated with the main domain controller through an ethernet, each electronic control unit is connected and communicated with the main domain controller through a whole vehicle bus (for example, a CAN bus), a diagnosis interface is connected and communicated with the main domain controller through the whole vehicle bus, and at least one electronic control unit is correspondingly controlled in a corresponding domain of each sub-domain controller; for any electronic control unit, when the electronic control unit has a fault, the electronic control unit generates a corresponding bus signal according to the current fault state and a preset fault signal definition value, encapsulates the generated bus signal into a corresponding event frame message, and sends n frame event frame messages to a sub-domain controller which controls the electronic control unit; for any sub-domain controller, when the sub-domain controller receives n frames of event frame messages sent by any electronic control unit controlled in a corresponding domain through a main domain controller, the sub-domain controller analyzes the received n frames of event frame messages and correspondingly obtains bus signals of the electronic control unit, so that fault confirmation and fault information management are carried out on the electronic control unit according to the obtained bus signals, wherein the fault information comprises a DTC fault code; the diagnostic equipment is connected to the fault diagnosis system through the diagnostic interface, and diagnoses any one sub-domain controller in the fault diagnosis system through the diagnostic protocol and the main domain controller so as to correspondingly process fault information in the sub-domain controller.
In the embodiment of the invention, each electronic control unit is connected to a main domain controller through a CAN bus network, each sub-domain controller is connected to the main domain controller through an Ethernet, and the main domain controller is equivalent to a gateway and used for forwarding data transmitted between the electronic control unit and the sub-domain controller.
It should be noted that each electronic control unit is preset with a fault signal definition value, for example, a certain bit is "0" to indicate no fault occurs, and a bit is "1" to indicate fault occurrence, and each time a fault occurs, a corresponding bus signal is generated according to the current fault state and the preset fault signal definition value, and the bus signal is encapsulated into a corresponding event frame message, and n frames (for example, n is 3) of event frame messages are sent to the corresponding sub-domain controller, and the messages are cleared each time the sub-domain controller wakes up.
In addition, the structure and the specific model of the diagnostic device are not specifically limited in the embodiment of the present invention, and the diagnostic device may be, for example, an existing Gryphon S3 vehicle-mounted diagnostic apparatus, an OBD vehicle-mounted diagnostic apparatus, or the like.
The invention provides a fault diagnosis method based on a domain controller, a main domain controller is equivalent to a gateway, a sub-domain controller carries out fault confirmation and fault information management on an electronic control unit controlled in a corresponding domain through the main domain controller, and a diagnosis device can diagnose the sub-domain controller and process fault information at the same time only through a diagnosis interface and the main domain controller, thereby realizing the function of the sub-domain controller and the fault diagnosis on the electronic control unit controlled in the corresponding domain, and a fault diagnosis module is not required to be arranged for each single sub-control unit, thereby effectively improving the diagnosis efficiency of a vehicle-mounted ECU, saving the time and the cost of the ECU diagnosis of a whole vehicle, simultaneously, sub-modules such as the electronic control unit and the like do not need the requirement of EEPROM storage, and realizing the unified interface of providing fault diagnosis service by the sub-domain controller of the corresponding domain, therefore, more abnormal fault judgment can be realized, the complexity of fault diagnosis of submodules such as an electronic control unit and the like can be reduced, and the fault diagnosis in a wider range can be realized.
In another preferred embodiment, the sub-domain controller performs fault confirmation and fault information management on any one of the electronic control units controlled in the corresponding domain by:
carrying out fault confirmation on the electronic control unit according to the obtained state information of the bus signal, and storing fault information of the electronic control unit after the fault is confirmed; wherein the state information at least comprises a signal length, a signal name and a signal definition value of the bus signal.
Specifically, with reference to the foregoing embodiment, after obtaining the corresponding bus signal from the n-frame event frame messages through parsing, each sub-domain controller performs fault confirmation on the electronic control unit that sends the n-frame event frame messages according to the state information of the bus signal, and stores the fault information of the electronic control unit after confirming the fault.
It should be noted that the status information of the bus signal at least includes the signal length, the signal name, and the signal definition value of the bus signal, and for example, whether the corresponding electronic control unit has a fault or not may be determined according to the signal definition value in the bus signal, and which fault the corresponding electronic control unit sends may be determined according to the signal name in the bus signal.
In another preferred embodiment, the sub-domain controller manages fault information of any one of the electronic control units controlled in the corresponding domain by:
managing the fault information of the electronic control unit controlled in the corresponding domain through a preset fault DTC table; the fault DTC table at least comprises ID information, name information, message sending period, message length and DTC fault codes of the electronic control unit.
Specifically, with reference to the above embodiment, after determining that any one electronic control unit controlled in the corresponding domain has a fault, each sub-domain controller manages fault information of the electronic control unit according to a preset fault DTC table, for example, the fault information is correspondingly stored in the fault DTC table and is correspondingly recorded as a current fault, and after each sleep wake-up, all the fault information is history fault information.
It should be noted that the fault DTC table at least includes ID information, name information, message sending period, message length, and DTC fault code of the electronic control unit controlled in the corresponding domain of each sub-domain controller.
In another preferred embodiment, the main domain controller and the sub domain controller are pre-assigned with diagnostic IDs; the diagnosis equipment diagnoses any sub-domain controller to correspondingly process the fault information by the following steps:
and identifying the main domain controller and the sub domain controller through the diagnosis ID, and diagnosing any sub domain controller through the main domain controller so as to read or/and clear the fault information.
Specifically, with reference to the foregoing embodiment, the main domain controller and each sub-domain controller are pre-assigned with a diagnostic ID, and the diagnostic device may identify the main domain controller and each sub-domain controller through the diagnostic ID, and diagnose any one sub-domain controller through the main domain controller after the identification, so as to read or/and clear the fault information stored in the sub-domain controller, where the diagnostic protocol used by the diagnostic device is a fault diagnostic protocol commonly used in the prior art, and is not described in detail again.
It CAN be understood that the main domain controller may also identify each sub-domain controller by the diagnostic ID, and assign a corresponding transmission ID to the event frame message reported to the CAN bus by the electronic control unit, so that the sub-domain controller obtains the event frame message of the transmission ID after detecting the transmission ID corresponding to the electronic control unit controlled in the corresponding domain, thereby ensuring correct communication between the sub-domain controller and the electronic control unit.
As a refinement of the above solution, the electronic control unit comprises at least one of: the system comprises a PEPS control unit, an FDCM control unit, a BCM control unit, a VCU control unit, a BMS control unit and a TBOX communication module.
Specifically, in combination with the above embodiments, a plurality of Electronic Control Units (ECUs) are disposed in the vehicle network topology, for example, a PEPS Control Unit (i.e., Passive Entry Passive Start, keyless Entry and Start system), an FDCM Control Unit (i.e., a vehicle door Control module), a BCM Control Unit (i.e., a vehicle body Control module), a VCU Control Unit (i.e., a vehicle Control module), a BMS Control Unit (i.e., a power management Control system), a TBOX communication module, and the like.
It can be understood that a plurality of sub-domain controllers, such as a vehicle body domain controller, a power domain controller, an auxiliary driving domain controller, an entertainment domain controller and the like, are further arranged in the overall vehicle network topology architecture, and each sub-domain controller governs at least one electronic control unit, such as a vehicle body sub-domain controller for controlling and managing the BCM control unit.
In summary, the system and the method for fault diagnosis based on the domain controller provided by the embodiments of the present invention have the following beneficial effects:
the electronic control unit is connected to the main domain controller through a whole vehicle bus, the sub-domain controller is connected and communicated with the main domain controller through an Ethernet, the electronic control unit and the diagnosis interface are respectively connected and communicated with the main domain controller through the whole vehicle bus, the sub-domain controller correspondingly controls at least one electronic control unit, wherein the main domain controller is equivalent to a gateway, the sub-domain controller performs fault confirmation and fault information management on the electronic control unit controlled in a corresponding domain through the main domain controller, and the diagnosis equipment can diagnose the sub-domain controller and process fault information at the same time only through the diagnosis interface and the main domain controller, thereby realizing the functions of the sub-domain controller and the fault diagnosis on the electronic control unit controlled in the corresponding domain, and effectively improving the diagnosis efficiency of the vehicle-mounted ECU without arranging a fault diagnosis module for each single sub-control unit, the time and the cost of ECU diagnosis of the whole vehicle are saved, meanwhile, the sub-modules of the electronic control unit and the like do not need the requirement of EEPROM storage, the unified interface providing fault diagnosis service by the sub-domain controller of the corresponding domain can be realized, so that more abnormal fault judgment can be realized, the complexity of fault diagnosis of the sub-modules of the electronic control unit and the like can be reduced, the fault diagnosis in a wider range can be realized, the diagnosis data of the system is uniformly managed by the sub-domain controller, and the reliable intuitive data of the system can be provided for users, such as good, better, common and poor states.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A domain controller-based fault diagnosis system, comprising: the system comprises a main domain controller, a plurality of sub-domain controllers, a plurality of electronic control units and a diagnosis interface; the sub-domain controller is connected with and communicates with the main domain controller through an Ethernet; the electronic control unit and the diagnosis interface are respectively connected and communicated with the main domain controller through a whole vehicle bus; the sub-domain controller correspondingly controls at least one electronic control unit; wherein,
the electronic control unit is used for generating a bus signal according to the current fault state and a preset fault signal definition value when a fault occurs, and generating an event frame message according to the generated bus signal so as to send n frames of event frame messages to the corresponding sub-domain controller; wherein n > 1;
the sub-domain controller is used for acquiring a corresponding bus signal according to the n-frame event frame message when receiving the n-frame event frame message sent by any electronic control unit controlled in the corresponding domain through the main domain controller, and performing fault confirmation and fault information management on the electronic control unit according to the acquired bus signal; wherein the fault information comprises a DTC fault code;
the diagnosis interface is used for connecting diagnosis equipment; the diagnostic equipment is used for diagnosing any sub-domain controller through the main domain controller so as to correspondingly process the fault information.
2. The domain controller-based fault diagnosis system according to claim 1, wherein the sub-domain controller is specifically configured to perform fault confirmation on the electronic control units according to the obtained status information of the bus signals, and to store fault information of the electronic control units after confirming the fault; wherein the state information at least comprises a signal length, a signal name and a signal definition value of the bus signal.
3. The domain controller-based fault diagnosis system according to claim 1, wherein the sub-domain controller is specifically configured to manage fault information of the electronic control units controlled in the corresponding domain through a preset fault DTC table; the fault DTC table at least comprises ID information, name information, message sending period, message length and DTC fault codes of the electronic control unit.
4. The domain controller-based fault diagnosis system of claim 1, wherein the main domain controller and the sub domain controller are previously assigned with diagnosis IDs; the diagnostic device is specifically configured to identify the main domain controller and the sub domain controller by the diagnostic ID, and diagnose any one of the sub domain controllers by the main domain controller to read or/and clear the fault information.
5. A domain controller based fault diagnosis system according to any of the claims 1 to 4, characterized in that said electronic control unit comprises at least one of the following: the system comprises a PEPS control unit, an FDCM control unit, a BCM control unit, a VCU control unit, a BMS control unit and a TBOX communication module.
6. A fault diagnosis method based on a domain controller, which is suitable for the fault diagnosis system based on the domain controller according to any one of claims 1 to 5; the method comprises the following steps:
when the electronic control unit fails, generating a bus signal according to the current fault state and a preset fault signal definition value, and generating an event frame message according to the generated bus signal so as to send n frames of event frame messages to the corresponding sub-domain controller; wherein n > 1;
when the sub-domain controller receives n frames of event frame messages sent by any electronic control unit controlled in the corresponding domain through the main domain controller, the sub-domain controller acquires corresponding bus signals according to the n frames of event frame messages, and performs fault confirmation and fault information management on the electronic control unit according to the acquired bus signals; wherein the fault information comprises a DTC fault code;
and the diagnosis equipment diagnoses any one sub-domain controller through the main domain controller so as to correspondingly process the fault information.
7. The domain controller-based fault diagnosis method according to claim 6, wherein the sub-domain controller performs fault confirmation and fault information management for any one of the electronic control units controlled within the corresponding domain by:
carrying out fault confirmation on the electronic control unit according to the obtained state information of the bus signal, and storing fault information of the electronic control unit after the fault is confirmed; wherein the state information at least comprises a signal length, a signal name and a signal definition value of the bus signal.
8. The domain controller-based fault diagnosis method according to claim 6, wherein the sub-domain controller performs fault information management on any one of the electronic control units controlled within a corresponding domain by:
managing the fault information of the electronic control unit controlled in the corresponding domain through a preset fault DTC table; the fault DTC table at least comprises ID information, name information, message sending period, message length and DTC fault codes of the electronic control unit.
9. The domain controller-based fault diagnosis method of claim 6, wherein the main domain controller and the sub domain controller are previously assigned diagnosis IDs; the diagnosis equipment diagnoses any sub-domain controller to correspondingly process the fault information by the following steps:
and identifying the main domain controller and the sub domain controller through the diagnosis ID, and diagnosing any sub domain controller through the main domain controller so as to read or/and clear the fault information.
10. The domain controller-based fault diagnosis method according to any one of claims 6 to 9, wherein the electronic control unit comprises at least one of: the system comprises a PEPS control unit, an FDCM control unit, a BCM control unit, a VCU control unit, a BMS control unit and a TBOX communication module.
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