CN113093687A - Fault diagnosis system and method based on domain controller - Google Patents

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

A fault diagnosis system and method based on domain controller

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 technique

Vehicle ECU is the brain of the car, which is mainly composed of microprocessor (such as CPU), memory (such as ROM, RAM), input/output interface (I/O), analog-to-digital converter (A/D), as well as shaping, driving, etc. It is composed of large-scale integrated circuits. Therefore, in order to ensure the normal operation of the car, the fault diagnosis of the on-board ECU is particularly important.

At present, the design of the fault diagnosis function of the car is facing each ECU, that is, the on-board ECU is independently diagnosed, but with the increasing number of ECUs in the vehicle, if all ECUs in the vehicle are diagnosed once, it is necessary to It takes a long time and high cost. For example, in the case where the vehicle has more than 160 ECUs, it is necessary to write the corresponding software code for each ECU, design, adjust and verify, etc. At the same time, during this process Professional diagnostic advice or professionals are required to determine the fault. For the huge on-board system of the whole vehicle, the efficiency of fault diagnosis is greatly shortened.

SUMMARY OF THE INVENTION

The technical problem to be solved by the embodiments of the present invention is to provide a fault diagnosis system and method based on a domain controller, which can effectively reduce the diagnosis efficiency of the vehicle ECU and save the time and cost of the vehicle ECU diagnosis.

In order to solve the above technical problem, an embodiment of the present invention provides a fault diagnosis system based on a domain controller, including: a main domain controller, several sub-domain controllers, several electronic control units and a diagnosis interface; the sub-domain controller The controller communicates with the main domain controller through Ethernet; the electronic control unit and the diagnostic interface respectively connect and communicate with the main domain controller through the vehicle bus; the sub-domain controller controls at least one the electronic control unit; wherein,

The electronic control unit is used to generate a bus signal according to the current fault state and the preset fault signal definition value when a fault occurs, and generate an event frame message according to the generated bus signal, so as to send the corresponding sub-domain controller. Send n frames of event frame messages; among them, n>1;

The sub-domain controller is configured to acquire a corresponding bus signal according to the n-frame event frame message when receiving the n-frame event frame message sent by any one of the electronic control units controlled in the corresponding domain through the primary domain controller , and perform fault confirmation and fault information management on the electronic control unit according to the obtained bus signal; wherein, the fault information includes DTC fault codes;

The diagnosis interface is used for connecting a diagnosis device; wherein, the diagnosis device is used for diagnosing any of the sub-domain controllers through the main domain controller, so as to perform corresponding processing on the fault information.

Further, the sub-domain controller is specifically configured to confirm the fault of the electronic control unit according to the obtained state information of the bus signal, and store the fault information of the electronic control unit after the fault is confirmed; The status information includes at least the signal length, signal name and signal definition value of the bus signal.

Further, the sub-domain controller is specifically configured to manage the fault information of the electronic control unit controlled in the corresponding domain through a preset fault DTC table; wherein the fault DTC table at least includes the electronic control unit's fault information. ID information, name information, packet sending cycle, packet length and DTC fault code.

Further, the primary domain controller and the sub-domain controller are pre-assigned a diagnostic ID; the diagnostic device is specifically configured to identify the primary domain controller and the sub-domain controller through the diagnostic ID, and Diagnose any of the sub-domain controllers through the primary domain controller, so as to read or/and clear the fault information.

Further, the electronic control unit includes at least one of the following: 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 also provides a domain controller-based fault diagnosis method, which is applicable to the domain controller-based fault diagnosis system described in any one of the above; the method includes:

When a fault occurs, the electronic control unit generates a bus signal according to the current fault state and a preset fault signal definition value, and generates an event frame message according to the generated bus signal, so as to send n to the corresponding sub-domain controller. Frame event frame message; among them, n>1;

When the sub-domain controller receives, through the primary domain controller, the n-frame event frame message sent by any one of the electronic control units controlled in the corresponding domain, obtains the corresponding bus signal according to the n-frame event frame message, and carry out fault confirmation and fault information management to the electronic control unit according to the obtained bus signal; wherein, the fault information includes DTC fault codes;

The diagnosing device diagnoses any of the sub-domain controllers through the primary domain controller, so as to perform corresponding processing on the fault information.

Further, the sub-domain controller performs fault confirmation and fault information management on any of the electronic control units controlled in the corresponding domain through the following steps:

Confirm the fault of the electronic control unit according to the obtained state information of the bus signal, and store the fault information of the electronic control unit after the fault is confirmed; wherein, the state information at least includes the signal length of the bus signal, the signal Name and signal definition value.

Further, the sub-domain controller performs fault information management on any of the electronic control units controlled in the corresponding domain through the following steps:

The fault information of the electronic control unit controlled in the corresponding domain is managed through a preset fault DTC table; wherein, the fault DTC table at least includes the ID information, name information, message sending period, message text length and DTC fault codes.

Further, the primary domain controller and the sub-domain controller are pre-assigned a diagnosis ID; the diagnosis device diagnoses any of the sub-domain controllers through the following steps, so as to perform corresponding processing on the fault information :

Identify the primary domain controller and the child domain controller through the diagnostic ID, and diagnose any of the child domain controllers through the primary domain controller, so as to read or read the fault information. / and clear processing.

Further, the electronic control unit includes at least one of the following: 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 beneficial effects of the embodiments of the present invention are:

Each electronic control unit is connected to the main domain controller through the vehicle bus, each sub-domain controller is connected and communicated with the main domain controller through Ethernet, and each electronic control unit and diagnostic interface are respectively connected to the main domain controller through the vehicle bus. Each sub-domain controller controls at least one electronic control unit correspondingly, wherein the main domain controller is equivalent to a gateway, and the sub-domain controller uses the main domain controller to confirm faults and faults of the electronic control units controlled in the corresponding domain. Information management, and the diagnostic equipment only needs to use the diagnostic interface and the main domain controller to diagnose the sub-domain controller and process the fault information at the same time, so as to realize the function of the sub-domain controller and the electronic control unit of the corresponding domain control. It can effectively improve the diagnostic efficiency of the vehicle ECU and save the time and cost of the vehicle ECU diagnosis. At the same time, the electronic control unit and other sub-modules do not require EEPROM storage requirements. , which can realize the unified interface of fault diagnosis service provided by the sub-domain controller of the corresponding domain, so as to realize more abnormal fault determination, thereby reducing the complexity of fault diagnosis of sub-modules such as electronic control units, and realizing a wider range of faults. Diagnosis, through the unified management of the system's diagnosis data through the sub-domain controller, can provide users with intuitive data of the reliability of the system, such as the status is very good, good, average and poor.

Description of drawings

In order to illustrate the technical solutions of the present invention more clearly, the following will briefly introduce the accompanying drawings used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, which are common in the art. As far as technical personnel are concerned, other drawings can also be obtained based on these drawings without any creative effort.

1 is a schematic structural diagram of a preferred embodiment of a fault diagnosis system based on a domain controller provided by the present invention;

2 is a schematic structural diagram of another preferred embodiment of a fault diagnosis system based on a domain controller provided by the present invention;

FIG. 3 is a flowchart of a preferred embodiment of a method for diagnosing faults based on a domain controller provided by the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to FIG. 1, it is a schematic structural diagram of a preferred embodiment of a fault diagnosis system based on a domain controller provided by the present invention. The system includes: a main domain controller, several sub-domain controllers, and several electronic control unit and diagnosis interface; the sub-domain controller is connected and communicated with the main domain controller through Ethernet; the electronic control unit and the diagnosis interface are connected and communicated with the main domain controller through the vehicle bus respectively; The sub-domain controller correspondingly controls at least one of the electronic control units; wherein,

The electronic control unit is used to generate a bus signal according to the current fault state and the preset fault signal definition value when a fault occurs, and generate an event frame message according to the generated bus signal, so as to send the corresponding sub-domain controller. Send n frames of event frame messages; among them, n>1;

The sub-domain controller is configured to acquire a corresponding bus signal according to the n-frame event frame message when receiving the n-frame event frame message sent by any one of the electronic control units controlled in the corresponding domain through the primary domain controller , and perform fault confirmation and fault information management on the electronic control unit according to the obtained bus signal; wherein, the fault information includes DTC fault codes;

The diagnosis interface is used for connecting a diagnosis device; wherein, the diagnosis device is used for diagnosing any of the sub-domain controllers through the main domain controller, so as to perform corresponding processing on the fault information.

Specifically, the main domain controller is equivalent to a gateway, and each sub-domain controller (for example, sub-domain controller 1, sub-domain controller 2, and sub-domain controller 3 in FIG. 1 ) is connected to the main domain controller through Ethernet Communication, each electronic control unit (such as electronic control unit 1, electronic control unit 2, electronic control unit 3, electronic control unit 4 and electronic control unit 5 in FIG. The main domain controller is connected and communicated, and the diagnostic interface is connected and communicated with the main domain controller through the vehicle bus. The corresponding domain of each sub-domain controller controls at least one electronic control unit; for any electronic control unit, when the electronic control unit When the unit fails, the electronic control unit generates a corresponding bus signal according to the current fault state and the preset fault signal definition value, encapsulates the generated bus signal into a corresponding event frame message, and sends it to the sub-controller of the electronic control unit. The domain controller sends n frames of event frame messages; 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 the corresponding domain through the master domain controller , the subdomain controller parses the received n-frame event frame message, and obtains the bus signal of the electronic control unit accordingly, so as to confirm the fault of the electronic control unit and manage the fault information according to the obtained bus signal, wherein the fault information Including DTC fault codes; the diagnostic equipment is connected to the fault diagnosis system through the diagnostic interface, and diagnoses any sub-domain controller in the fault-diagnosis system through the diagnostic protocol and the master domain controller, so as to perform fault information in the sub-domain controller. Treat accordingly.

In the embodiment of the present invention, each electronic control unit is connected to the main domain controller through a CAN bus network, and each sub-domain controller is connected to the main domain controller through Ethernet, and the main domain controller is equivalent to a gateway, using It is used to forward data transmitted between the electronic control unit and the subdomain controller.

It should be noted that each electronic control unit has preset fault signal definition values. For example, a certain bit is "0" to indicate that no fault has occurred, and "1" to indicate that a fault has occurred. The current fault state and the preset fault signal definition value generate the corresponding bus signal, encapsulate the bus signal into the corresponding event frame message, and send n frames (for example, n=3) event frame message to the corresponding subdomain controller. The text is cleared every time it wakes up from sleep.

In addition, the embodiments of the present invention do not specifically limit the structure and specific model of the diagnostic device. For example, the diagnostic device may be the existing Gryphon S3 on-board diagnostic instrument, OBD on-board diagnostic instrument, and the like.

In a fault diagnosis system based on a domain controller provided by an embodiment of the present invention, the electronic control unit is connected to the main domain controller through the vehicle bus, the sub-domain controller is connected and communicated with the main domain controller through the Ethernet, and the electronic control unit The main domain controller and the diagnostic interface are respectively connected and communicated with the main domain controller through the vehicle bus, and the sub-domain controller controls at least one electronic control unit correspondingly. The controlled electronic control unit performs fault confirmation and fault information management, and the diagnostic equipment only needs to use the diagnostic interface and the main domain controller to diagnose the sub-domain controller and process the fault information at the same time, so as to realize the fault information of the sub-domain controller. Function and fault diagnosis of the electronic control unit controlled in the corresponding domain, there is no need to set a fault diagnosis module for each single control unit, which can effectively improve the diagnostic efficiency of the vehicle ECU, save the time and cost of the vehicle ECU diagnosis, and at the same time, the electronic control Units and other sub-modules do not require EEPROM storage, and can realize the unified interface of fault diagnosis services provided by the sub-domain controller of the corresponding domain, so as to realize more abnormal fault determination, thereby reducing the fault diagnosis of electronic control units and other sub-modules. complexity, to achieve a wider range of fault diagnosis.

In another preferred embodiment, the sub-domain controller is specifically configured to confirm the fault of the electronic control unit according to the obtained state information of the bus signal, and to perform fault information on the electronic control unit after the fault is confirmed. storage; wherein, the state information includes at least the signal length, signal name and signal definition value of the bus signal.

Specifically, in combination with the above embodiments, after parsing and obtaining the corresponding bus signal from the n-frame event frame message, each sub-domain controller performs the processing on the electronic control unit that sends the n-frame event frame message according to the state information of the bus signal. The fault is confirmed, and the fault information of the electronic control unit is stored after the fault is confirmed.

It should be noted that the status information of the bus signal includes at least the signal length, signal name and signal definition value of the bus signal. For example, it can be judged whether the corresponding electronic control unit fails according to the signal definition value in the bus signal. Determine which kind of fault the corresponding electronic control unit sends; for example, some control signals corresponding to 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 the fault information of the electronic control unit controlled in the corresponding domain through a preset fault DTC table; wherein the fault DTC table at least includes all Describe the ID information, name information, message sending period, message length and DTC fault code of the electronic control unit.

Specifically, in combination with the above embodiments, after determining that any electronic control unit controlled in the corresponding domain is faulty, the subdomain controller manages the fault information of the electronic control unit according to the preset fault DTC table, for example, the fault information Correspondingly, it is stored in the fault DTC table, and the corresponding record is the current fault. After each sleep wake-up, all the fault information is the historical fault information.

It should be noted that the fault DTC table at least includes the 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, a partial fault DTC table As shown in table 2.

Table 2 Partial fault DTC table

serial number Send ID ECU name message sending cycle 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 primary domain controller and the sub-domain controller are pre-assigned a diagnostic ID; the diagnostic device is specifically configured to identify the primary domain controller and the sub-domain controller through the diagnostic ID A domain controller, and diagnosing any of the sub-domain controllers through the primary domain controller, so as to read or/and clear the fault information.

Specifically, in combination with the above embodiment, the primary domain controller and each sub-domain controller are pre-assigned a diagnostic ID, and the diagnostic device can identify the primary domain controller and each sub-domain controller through the diagnostic ID, and After the identification, the primary domain controller is used to diagnose any sub-domain controller, so as to read or/and clear the fault information stored in the sub-domain controller, wherein the diagnosis protocol used by the diagnosis equipment is the prior art The commonly used fault diagnosis protocol in , again will not be described in detail.

It can be understood that the main domain controller can also identify each sub-domain controller through the diagnostic ID, and assign the corresponding sending ID to the event frame message reported by the electronic control unit to the CAN bus, so that the sub-domain controller is detecting After reaching the sending ID corresponding to the electronic control unit controlled in the corresponding domain, the event frame message of the sending ID is obtained, so as to ensure correct communication between the sub-domain controller and the electronic control unit.

For example, the diagnostic IDs of the primary domain controller and some sub-domain controllers are shown in Table 3. The primary domain controller can determine the sub-domain controllers that need to perform diagnostic functions in the vehicle network topology according to the assigned diagnostic IDs, as shown in Table 3. For example, when the primary domain controller detects data containing 0x7E1 and/or 0x4E1, it identifies the child domain controller that sent the data as child domain controller 1.

Table 3 Diagnostic IDs of the primary domain controller and some child domain controllers

serial number Send ID Receive ID ECU name 1 0x7E0 0x4E0 primary domain controller 2 0x7E1 0x4E1 child domain controller 1 3 0x7E2 0x4E2 child domain controller 2 4 0x7E3 0x4E3 child domain controller 3

Referring to FIG. 2, it is a schematic structural diagram of another preferred embodiment of a fault diagnosis system based on a 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: PEPS control unit, FDCM control unit, BCM control unit, VCU control unit, BMS control unit and TBOX communication module.

Specifically, in combination with the above embodiments, a plurality of electronic control units (ECUs, Electronic Control Units) are set in the vehicle network topology, for example, PEPS control units (ie Passive Entry PassiveStart, keyless entry and start system), FDCM Control unit (ie door control module), BCM control unit (ie body control module), VCU control unit (ie vehicle control module), BMS control unit (ie power management control system) and TBOX communication module, etc.

It can be understood that there are also multiple sub-domain controllers in the vehicle network topology, for example, the body domain controller, the power domain controller, the assisted driving domain controller, the entertainment domain controller, etc., each sub-domain controller has jurisdiction over the At least one electronic control unit, eg, a body subdomain controller, is used to control and manage the BCM control unit.

2, in an optional embodiment, the system further includes a TBOX or V2X module (information display domain), a cloud server; the TBOX or V2X module is connected and communicated with the main domain controller through the CAN bus; the TBOX or V2X module communicates with the main domain controller; Or the V2X module communicates with the cloud server through the mobile network; the cloud server communicates with the secure client (such as mobile phones, computers and other devices) through a secure Internet channel, and the cloud server communicates with the third-party client (such as the owner's mobile phone) through the mobile network .

The data received by the main domain controller can be uploaded to the cloud server through the TBOX or V2X module to be shared with security clients or third-party clients, such as the owner's mobile phone and the security client of the car developer, so that the car owner or car developer Technicians can remotely view the fault information and operation information of the car, and can also communicate with other cars, base stations, etc. through the TBOX or V2X module to realize the exchange of information between the car and the outside world.

Referring to FIG. 3 , it is a flowchart of a preferred embodiment of a domain controller-based fault diagnosis method provided by the present invention, and the method is applicable to any of the above-mentioned domain controller-based fault diagnosis systems ; The method includes steps S11 to S13:

Step S11, when a fault occurs, the electronic control unit generates a bus signal according to the current fault state and a preset fault signal definition value, and generates an event frame message according to the generated bus signal to control the corresponding sub-domain. The controller sends n frames of event frame messages; among them, n>1;

Step S12, when the sub-domain controller receives, through the primary domain controller, the n-frame event frame message sent by any of the electronic control units controlled in the corresponding domain, obtains the corresponding event frame message according to the n-frame event frame message. bus signal, and perform fault confirmation and fault information management on the electronic control unit according to the obtained bus signal; wherein, the fault information includes DTC fault code;

Step S13, the diagnosis device diagnoses any one of the sub-domain controllers through the primary domain controller, so as to perform corresponding processing on the fault information.

Specifically, the main domain controller of the fault diagnosis system is equivalent to a gateway, each sub-domain controller communicates with the main domain controller through Ethernet, and each electronic control unit communicates with the main domain controller through the vehicle bus (for example, the CAN bus). The main domain controller is connected and communicated, and the diagnostic interface is connected and communicated with the main domain controller through the vehicle bus. The corresponding domain of each sub-domain controller controls at least one electronic control unit; for any electronic control unit, when the electronic control unit When the unit fails, the electronic control unit generates a corresponding bus signal according to the current fault state and the preset fault signal definition value, encapsulates the generated bus signal into a corresponding event frame message, and sends it to the sub-controller of the electronic control unit. The domain controller sends n frames of event frame messages; 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 the corresponding domain through the master domain controller , the subdomain controller parses the received n-frame event frame message, and obtains the bus signal of the electronic control unit accordingly, so as to confirm the fault of the electronic control unit and manage the fault information according to the obtained bus signal, wherein the fault information Including DTC fault codes; the diagnostic equipment is connected to the fault diagnosis system through the diagnostic interface, and diagnoses any sub-domain controller in the fault-diagnosis system through the diagnostic protocol and the master domain controller, so as to perform fault information in the sub-domain controller. Treat accordingly.

In the embodiment of the present invention, each electronic control unit is connected to the main domain controller through a CAN bus network, and each sub-domain controller is connected to the main domain controller through Ethernet, and the main domain controller is equivalent to a gateway, using It is used to forward data transmitted between the electronic control unit and the subdomain controller.

It should be noted that each electronic control unit has preset fault signal definition values. For example, a certain bit is "0" to indicate that no fault has occurred, and "1" to indicate that a fault has occurred. The current fault state and the preset fault signal definition value generate the corresponding bus signal, encapsulate the bus signal into the corresponding event frame message, and send n frames (for example, n=3) event frame message to the corresponding subdomain controller. The text is cleared every time it wakes up from sleep.

In addition, the embodiments of the present invention do not specifically limit the structure and specific model of the diagnostic device. For example, the diagnostic device may be the existing Gryphon S3 on-board diagnostic instrument, OBD on-board diagnostic instrument, and the like.

In a domain controller-based fault diagnosis method provided by an embodiment of the present invention, a primary domain controller is equivalent to a gateway, and a subdomain controller performs fault confirmation and fault information management on an electronic control unit controlled in a corresponding domain through the primary domain controller , and the diagnostic device only needs to use the diagnostic interface and the main domain controller to diagnose the sub-domain controller and process the fault information at the same time, so as to realize the function of the sub-domain controller and the failure of the electronic control unit controlled in the corresponding domain. Diagnosis, there is no need to set a fault diagnosis module for each single control unit, which can effectively improve the diagnostic efficiency of the vehicle ECU and save the time and cost of the vehicle ECU diagnosis. Realize a unified interface for fault diagnosis services provided by sub-domain controllers of the corresponding domain, so as to realize more abnormal fault determination, thereby reducing the complexity of fault diagnosis of sub-modules such as electronic control units, and realizing a wider range of fault diagnosis.

In another preferred embodiment, the sub-domain controller performs fault confirmation and fault information management on any of the electronic control units controlled in the corresponding domain through the following steps:

Confirm the fault of the electronic control unit according to the obtained state information of the bus signal, and store the fault information of the electronic control unit after the fault is confirmed; wherein, the state information at least includes the signal length of the bus signal, the signal Name and signal definition value.

Specifically, in combination with the above embodiments, after parsing and obtaining the corresponding bus signal from the n-frame event frame message, each sub-domain controller performs the processing on the electronic control unit that sends the n-frame event frame message according to the state information of the bus signal. The fault is confirmed, and the fault information of the electronic control unit is stored after the fault is confirmed.

It should be noted that the status information of the bus signal includes at least the signal length, signal name and signal definition value of the bus signal. For example, it can be judged whether the corresponding electronic control unit fails according to the signal definition value in the bus signal. The name of the signal determines which fault is sent by the corresponding electronic control unit.

In another preferred embodiment, the sub-domain controller performs fault information management on any of the electronic control units controlled in the corresponding domain through the following steps:

The fault information of the electronic control unit controlled in the corresponding domain is managed through a preset fault DTC table; wherein, the fault DTC table at least includes the ID information, name information, message sending period, message text length and DTC fault codes.

Specifically, in combination with the above embodiments, after determining that any electronic control unit controlled in the corresponding domain is faulty, each subdomain controller manages the fault information of the electronic control unit according to the preset fault DTC table, for example, the The fault information is correspondingly stored in the fault DTC table, and the corresponding record is the current fault. After each sleep wake-up, all the fault information is the historical 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 primary domain controller and the sub-domain controller are pre-assigned diagnostic IDs; The fault information is processed accordingly:

Identify the primary domain controller and the child domain controller through the diagnostic ID, and diagnose any of the child domain controllers through the primary domain controller, so as to read or read the fault information. / and clear processing.

Specifically, in combination with the above embodiment, the primary domain controller and each sub-domain controller are pre-assigned a diagnostic ID, and the diagnostic device can identify the primary domain controller and each sub-domain controller through the diagnostic ID, and After the identification, the primary domain controller is used to diagnose any sub-domain controller, so as to read or/and clear the fault information stored in the sub-domain controller, wherein the diagnosis protocol used by the diagnosis equipment is the prior art The commonly used fault diagnosis protocol in , again will not be described in detail.

It can be understood that the main domain controller can also identify each sub-domain controller through the diagnostic ID, and assign the corresponding sending ID to the event frame message reported by the electronic control unit to the CAN bus, so that the sub-domain controller is detecting After reaching the sending ID corresponding to the electronic control unit controlled in the corresponding domain, the event frame message of the sending ID is obtained, so as to ensure correct communication between the sub-domain controller and the electronic control unit.

As an improvement of the above solution, the electronic control unit includes at least one of the following: 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, Electronic Control Units) are set in the vehicle network topology, for example, PEPS control units (ie Passive Entry PassiveStart, keyless entry and start system), FDCM Control unit (ie door control module), BCM control unit (ie body control module), VCU control unit (ie vehicle control module), BMS control unit (ie power management control system) and TBOX communication module, etc.

It can be understood that there are also multiple sub-domain controllers in the vehicle network topology, for example, the body domain controller, the power domain controller, the assisted driving domain controller, the entertainment domain controller, etc., each sub-domain controller has jurisdiction over the At least one electronic control unit, eg, a body subdomain controller, is used to control and manage the BCM control unit.

To sum up, the domain controller-based fault diagnosis system and method 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 the vehicle bus, the sub-domain controller is connected and communicated with the main domain controller through the Ethernet, and the electronic control unit and the diagnostic interface are connected and communicated with the main domain controller through the vehicle bus respectively. The controller controls at least one electronic control unit correspondingly, wherein the main domain controller is equivalent to a gateway, and the sub-domain controller performs fault confirmation and fault information management on the electronic control unit controlled in the corresponding domain through the main domain controller, and the diagnostic equipment only needs to Through the diagnosis interface and the main domain controller, the sub-domain controller can be diagnosed and the fault information can be processed at the same time, so as to realize the function of the sub-domain controller and the fault diagnosis of the electronic control unit controlled in the corresponding domain. The single sub-control unit is equipped with a fault diagnosis module, which can effectively improve the diagnosis efficiency of the vehicle ECU and save the time and cost of the vehicle ECU diagnosis. At the same time, the electronic control unit and other sub-modules do not require EEPROM storage requirements, which can be unified by the corresponding domain. The subdomain controller provides an interface for fault diagnosis services to facilitate the realization of more abnormal fault determinations, thereby reducing the complexity of fault diagnosis for sub-modules such as electronic control units and realizing a wider range of fault diagnosis. The diagnostic data of the system is managed in a unified manner, which can provide users with intuitive data on the reliability of the system, such as good, good, average and poor status.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principle of the present invention, several improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (10)

1. A fault diagnosis system based on a domain controller, characterized in that it comprises: a main domain controller, several sub-domain controllers, several electronic control units, and a diagnostic interface; The main domain controller is connected and communicated; the electronic control unit and the diagnostic interface are respectively connected and communicated with the main domain controller through the vehicle bus; the sub-domain controller correspondingly controls at least one of the electronic control units; wherein , The electronic control unit is used to generate a bus signal according to the current fault state and the preset fault signal definition value when a fault occurs, and generate an event frame message according to the generated bus signal, so as to send the corresponding sub-domain controller. Send n frames of event frame messages; among them, n>1; The sub-domain controller is configured to acquire a corresponding bus signal according to the n-frame event frame message when receiving the n-frame event frame message sent by any one of the electronic control units controlled in the corresponding domain through the primary domain controller , and perform fault confirmation and fault information management on the electronic control unit according to the obtained bus signal; wherein, the fault information includes DTC fault codes; The diagnosis interface is used for connecting a diagnosis device; wherein, the diagnosis device is used for diagnosing any of the sub-domain controllers through the main domain controller, so as to perform corresponding processing on the fault information. 2. The fault diagnosis system based on a domain controller according to claim 1, wherein the sub-domain controller is specifically configured to confirm the fault of the electronic control unit according to the obtained state information of the bus signal, and After the fault is confirmed, the fault information of the electronic control unit is stored; wherein, the state information at least includes the signal length, the signal name and the signal definition value of the bus signal. 3 . The fault diagnosis system based on a domain controller according to claim 1 , wherein the sub-domain controller is specifically used to detect the fault of the electronic control unit controlled in the corresponding domain through a preset fault DTC table. 4 . Information management; wherein, the fault DTC table includes at least the ID information, name information, message sending period, message length and DTC fault code of the electronic control unit. 4. The fault diagnosis system based on a domain controller according to claim 1, wherein the primary domain controller and the sub-domain controller are pre-assigned a diagnosis ID; The diagnostic ID identifies the primary domain controller and the sub-domain controller, and diagnoses any of the sub-domain controllers through the primary domain controller, so as to read the fault information or/and Clear processing. 5. The fault diagnosis system based on a domain controller according to any one of claims 1 to 4, wherein the electronic control unit comprises at least one of the following: a PEPS control unit, an FDCM control unit, a BCM control unit unit, VCU control unit, BMS control unit and TBOX communication module. 6 . A fault diagnosis method based on a domain controller, characterized in that it is applicable to the fault diagnosis system based on a domain controller according to any one of claims 1 to 5 ; the method comprises: When a fault occurs, the electronic control unit generates a bus signal according to the current fault state and a preset fault signal definition value, and generates an event frame message according to the generated bus signal, so as to send n to the corresponding sub-domain controller. Frame event frame message; among them, n>1; When the sub-domain controller receives, through the primary domain controller, the n-frame event frame message sent by any one of the electronic control units controlled in the corresponding domain, obtains the corresponding bus signal according to the n-frame event frame message, and carry out fault confirmation and fault information management to the electronic control unit according to the obtained bus signal; wherein, the fault information includes DTC fault codes; The diagnosing device diagnoses any of the sub-domain controllers through the primary domain controller, so as to perform corresponding processing on the fault information. 7 . The method for diagnosing faults based on a domain controller according to claim 6 , wherein 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. 8 . : Confirm the fault of the electronic control unit according to the obtained state information of the bus signal, and store the fault information of the electronic control unit after the fault is confirmed; wherein, the state information at least includes the signal length of the bus signal, the signal Name and signal definition value. 8 . The fault diagnosis method based on a domain controller according to claim 6 , wherein the sub-domain controller performs fault information management on any one of the electronic control units controlled in the corresponding domain through the following steps: 9 . The fault information of the electronic control unit controlled in the corresponding domain is managed through a preset fault DTC table; wherein, the fault DTC table at least includes the ID information, name information, message sending period, message text length and DTC fault codes. 9. The method for diagnosing faults based on a domain controller according to claim 6, wherein the primary domain controller and the sub-domain controller are pre-assigned a diagnostic ID; 1. Diagnose the child domain controller so as to process the fault information accordingly: Identify the primary domain controller and the child domain controller through the diagnostic ID, and diagnose any of the child domain controllers through the primary domain controller, so as to read or read the fault information. / and clear processing. 10. The fault diagnosis method based on a domain controller according to any one of claims 6 to 9, wherein the electronic control unit comprises at least one of the following: a PEPS control unit, an FDCM control unit, and a BCM control unit , VCU control unit, BMS control unit and TBOX communication module.

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