JP2024130092A - Vehicle communication system and method for diagnosing abnormalities in communication network - Google Patents

Abstract

[Problem] To provide a vehicle communication system that reduces the number of repair processes performed by workers. [Solution] A vehicle communication system according to an embodiment includes a CGW connected to multiple buses and communicating with multiple ECUs connected to the buses, and multiple ECUs, the CGW has a function of transmitting tester request signals to the multiple ECUs, a function of receiving tester response signals transmitted from the multiple ECUs and decoding the tester response signals, a function of detecting a communication network abnormality based on the decoding result of the tester response signals, and a function of generating a report indicating the detection result of the communication network abnormality, and the ECU has a function of receiving a tester request from the CGW, a function of specifying the communication status of the ECU, and a function of generating and transmitting a tester response indicating the communication status. [Selected Figure] Figure 5

Description

The present invention relates to a method for diagnosing abnormalities in a vehicle communication system and a communication network.

As vehicle functions become more extensive, the number of ECUs (Electronic Control Units) installed in vehicles is on the rise, and the communication load between ECUs is also on the rise. In order to distribute the communication load between ECUs, network configurations using multiple CAN buses with a central gateway (CGW) are becoming mainstream.

JP 2014-113860 A

In the above network configuration, ECUs that transmit and receive simultaneously may be connected to different CAN buses. In such a situation, when the signal from the ECU is interrupted, it is difficult to determine where in the communication path the abnormality is occurring.

Although there is a method of end-to-end communication diagnosis, since one side diagnoses a breakdown in the other side, it is difficult to narrow down where the failure is in the communication path.
If it is difficult to identify where on the communication path a communication anomaly is occurring, workers may have difficulty reaching the repair location during maintenance or repair, leading to increased repair man-hours.

The present invention was made in consideration of the above circumstances, and aims to provide a method for diagnosing abnormalities in a vehicle communication system and a communication network that reduces the number of repair steps required by workers.

The vehicle communication system according to the first aspect of the present invention includes a CGW connected to a plurality of buses and communicating with a plurality of ECUs connected to the buses, and a plurality of the ECUs. The CGW includes a tester request signal transmission unit that transmits a tester request signal to the plurality of ECUs, a tester response signal decoding unit that receives tester response signals transmitted from the plurality of ECUs and decodes the tester response signals, an anomaly detection unit that detects a communication network anomaly based on the result of decoding the tester response signals, and a report creation unit that generates a report indicating the detection result of the communication network anomaly. The ECU includes a tester request signal reception unit that receives the tester request signal from the CGW, a communication status calculation unit that generates information indicating the communication status of the ECU, and a function of generating the tester response signal indicating the communication status and transmitting it to the CGW.

The method for diagnosing an abnormality in a communication network according to a second aspect of the present invention is a method for diagnosing an abnormality in a communication network of a vehicle communication system including a CGW connected to a plurality of buses and communicating with a plurality of ECUs connected to the buses, and a plurality of the ECUs, in which the CGW transmits a tester request signal to the plurality of ECUs, receives a tester response signal indicating the communication status of the ECUs, decodes the tester response signal, detects a communication network abnormality based on the result of decoding the tester response signal, generates a report indicating the detection result of the communication network abnormality, and distributes the report regarding the plurality of ECUs to the plurality of ECUs.

The present invention provides a method for diagnosing abnormalities in a vehicle communication system and a communication network that reduces the number of repair steps required by workers.

FIG. 1 is a block diagram illustrating an example of a configuration of a vehicle communication system according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating an example of the configuration of the CGW illustrated in FIG. FIG. 3 is a block diagram illustrating an example of the configuration of the ECU illustrated in FIG. FIG. 4 is a diagram for explaining an example of a tester request signal and a tester response signal. FIG. 5 is a flowchart for explaining an example of the operation of the CGW in the vehicle communication system according to the embodiment. FIG. 6 is a flowchart for explaining an example of the operation of the ECU of the vehicle communication system according to the embodiment. FIG. 7 is a diagram illustrating an example of a determination result of an abnormal portion of a communication network in a vehicle communication system according to an embodiment. FIG. 8 is a diagram for explaining an example of an effect of the vehicle communication system according to the embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle communication system and a method for diagnosing an abnormality in a communication network according to an embodiment will be described in detail below with reference to the accompanying drawings.
FIG. 1 is a block diagram illustrating an example of a configuration of a vehicle communication system according to an embodiment of the present invention.
The vehicle communication system of this embodiment includes a CGW 10 and a plurality of ECUs A1-C3. The vehicle communication system of this embodiment is applicable to a communication system including a CGW 10 and a plurality of ECUs A1-C3 connected to the CGW 10 via a bus, and can be applied to vehicles such as two-wheeled vehicles, three-wheeled vehicles, and four-wheeled vehicles. Furthermore, the present invention may be applied to any electronic device that includes a communication system of this configuration, not limited to vehicles.

CGW10 has at least one processor and a memory in which programs executed by the processor are recorded, and can realize various functions described below through software or a combination of software and hardware.

Each of ECUs A1-C3 has at least one processor and a memory in which a program executed by the processor is recorded, and can realize various functions described below by software or a combination of software and hardware.

The CGW10 is connected to multiple buses (main lines) BL1-BL3. ECUA1-C3 are connected to multiple branch lines extending from the buses BL1-BL3, and the CGW10 and ECUA1-C3 are connected so as to be able to communicate with each other via the buses BL1-BL3. The CGW10 may also be configured so as to be able to communicate with an external device. The CGW10 is a relay device that relays communication data by converting the data to be communicated into a format compatible with the communication destination, for example, in communication between a source and destination that handle different data formats and communication protocols.

The communication protocol between the CGW10 and the ECUA1-C3 may be, for example, CAN (Control Area Network/registered trademark). Note that the communication protocol between the CGW10 and the ECUA1-C3 is not limited to CAN, and may be Ethernet (Ethernet/registered trademark), LIN, MOST, FlexRay, etc.

Multiple ECUs A1-C3 may be connected to different buses BL1-BL3 according to their respective functions. For example, the ECU A1-C1 of the control system may be connected to bus BL1, the ECU A2-C2 of the diagnostic system may be connected to bus BL2, and the ECU A3-C3 of the local system may be connected to bus BL3.

FIG. 2 is a block diagram illustrating an example of the configuration of the CGW illustrated in FIG.
The CGW 10 includes a control unit 12, a communication unit 14, and a memory 16. The control unit 12, the communication unit 14, and the memory 16 are communicatively connected via a bus.

The communication unit 14 performs communication between the CGW 10 and other devices. In this embodiment, the communication unit 14 performs communication according to the CAN protocol.
The memory 16 is composed of a volatile memory element such as a RAM (Random Access Memory) or a non-volatile memory element such as a ROM (Read Only Memory), an EEPROM (Electrically Erasable Programmable ROM, registered trademark) or a flash memory, and has control programs and data to be referenced during processing recorded in advance.

The control program stored in memory 16 may be a control program read from a recording medium readable by CGW 10. Alternatively, the control program may be downloaded from an external computer (not shown) connected to a communication network (not shown) and stored in memory 16.

The control unit 12 includes at least one processor such as a CPU or an MPU, and can perform various controls by executing programs stored in the memory 16 .
The control unit 12 includes a tester request signal transmitting unit 12A, a tester response signal interpreting unit 12B, an abnormality detecting unit 12C, and a report creating unit 12D.

The tester request signal transmission unit 12A generates tester request signals for all of the multiple ECUs A1-C3 and transmits the generated tester request signals. Specifically, the tester request signal transmission unit 12A acquires the unique IDs (CANIDs) of the ECUs A1-C3 mounted on the vehicle communication system and acquires the format of the tester request signal. Here, the tester request signal transmission unit 12A specifies the types of the multiple buses BL1-BL3 (control CAN, diagnostic CAN, local CAN, etc.) and generates a tester request signal using the tester request signal format of the specified type.

The tester request signal transmission unit 12A may transmit a tester request signal periodically (e.g., every second) while the vehicle is in operation. The tester request signal transmission unit 12A may start the periodic transmission of the tester request signal, for example, when the vehicle's ignition switch is turned on. The tester request signal transmission unit 12A may also transmit a tester request signal in response to a command from an external device, for example, during vehicle maintenance or repair.

FIG. 4 is a diagram for explaining an example of a tester request signal and a tester response signal.
The tester request signal includes a broadcast ID and a request service ID. The broadcast ID is an identifier indicating that the signal is transmitted from CGW 10 to all devices connected to buses BL1-BL3. The request service ID is an identifier indicating a request for a tester response signal to a device receiving the tester request signal.

The tester response signal decoder 12B receives tester response signals transmitted from multiple ECUs A1-C3 and decodes the tester response signals. Specifically, the tester response signal decoder 12B acquires the unique ID of the ECU A1-C3 mounted in the vehicle communication system, identifies the ECU A1-C3 that transmitted the tester response signal based on the unique ID contained in the tester response signal, and decodes the contents of the tester response signal.

The tester response signals sent from multiple ECUs A1-C3 are in a single format and include a value indicating whether the ECU A1-C3 itself is normal or abnormal.

As shown in FIG. 4, the tester response signal includes an ID unique to ECUA1-C3, a response service ID, and a service status. The ID unique to ECUA1-C3 is an identifier assigned to each of ECUA1-C3. The response service ID is an identifier indicating that the signal is a response to a tester request signal sent from CGW10. The service status includes a value (communication status information) indicating whether the communication status of each of ECUA1-C3 is normal or abnormal.

The anomaly detection unit 12C detects an anomaly in the communication network based on the results of decoding the tester response signal. Specifically, the anomaly detection unit 12C compares the unique IDs of the tester response signals to detect the presence or absence of an anomaly in the communication status and the location of the anomaly.

The abnormality detection unit 12C sets a corresponding DTC (diagnostic trouble code) according to the location and type of the detected abnormality. For example, when the abnormality detection unit 12C detects a communication interruption, the harness (CAN system, power supply system) or the ECU body needs to be repaired, so the abnormality detection unit 12C determines the area to be repaired from the location of the interruption and sets the corresponding DTC.

The report creation unit 12D generates a report that indicates the results of the detection of a communication network abnormality. The report creation unit 12D distributes the results of decoding the tester response signal and information (report) related to the communication status abnormality to all ECUs A1-C3. The report sent to all ECUs A1-C3 has a single format and includes information such as whether each ECU A1-C3 is normal or abnormal, and whether there is a disruption. The report creation unit 12D may also send the report to an external device of the vehicle communication system.

FIG. 3 is a block diagram illustrating an example of the configuration of the ECU illustrated in FIG.
Each of the ECUs A1 to C3 includes a control unit 22, a communication unit 24, and a memory 26. The control unit 22, the communication unit 24, and the memory 26 are communicatively connected via a bus.

The communication unit 24 performs communication between the CGW 10 and other devices. In this embodiment, the communication unit 24 performs communication according to the CAN protocol.
The memory 26 is composed of a volatile memory element such as a RAM (Random Access Memory) or a non-volatile memory element such as a ROM (Read Only Memory), an EEPROM (Electrically Erasable Programmable ROM) or a flash memory, and has control programs and data to be referenced during processing recorded in advance.

The control program stored in memory 26 may be a control program read from a recording medium readable by CGW 10, supplied to ECU A1-C3, and stored in memory 26. Also, the control program may be downloaded from an external computer (not shown) connected to a communication network (not shown) and stored in memory 26.

The control unit 22 includes at least one processor such as a CPU or an MPU, and can perform various controls by executing programs stored in the memory 26 .
The control unit 22 includes a tester request signal receiving unit 22A, a communication status calculating unit 22B, and a tester response transmitting unit 22C.
The tester request signal receiving unit 22A receives a tester request signal from the CGW 10 .

The communication status calculation unit 22B acquires a tester request signal and calculates and specifies the communication status of the ECU A1-C3 in order to generate a tester response signal requested by the CGW 10. The communication status includes, for example, a value indicating whether the communication is normal (OK) or abnormal (NG), and further includes a value indicating the abnormal part (internal memory, communication interface, etc.) if the communication is abnormal.
The tester response transmission unit 22C generates a tester response signal including information indicating the communication status calculated by the communication status calculation unit 22B, and transmits the tester response signal to the CGW 10. The tester response signal may be transmitted periodically from the ECU A1-C3 as a response to a tester request signal transmitted periodically from the CGW 10, or may be transmitted from the ECU A1-C3 as a response to a tester request signal transmitted from the CGW 10 during maintenance or repair.

Next, an example of a method for diagnosing an abnormality in a communication network by the operation of the vehicle communication system according to an embodiment will be described.
FIG. 5 is a flowchart for explaining an example of the operation of the CGW in the vehicle communication system according to the embodiment.

The tester request signal transmitting unit 12A of the CGW 10 transmits a tester request signal to all the ECUs A1 to C3 (step S1).
The tester response signal interpreter 12B waits for a tester response signal (single format, normal/abnormal state of the main body, periodic transmission) (step S2).
Next, the tester response signal decoder 12B decodes the tester response signal received from the ECU A1-C3 and organizes the items that were received and the items that were not received (step S3). At this time, the tester response signal decoder 12B waits for a predetermined time from the time the tester request signal was transmitted, and then organizes the items related to the tester response signal that was not received (items that were not received).

Next, based on the contents organized by the tester response signal interpretation unit 12B, the abnormality detection unit 12C determines the presence or absence of an abnormality and the location of the abnormality, and the report creation unit 12D creates a report (single format, normal/abnormal/disrupted/not set for each device, periodically sent) and distributes the report to all ECUs A1-C3 (step S4). Note that for functions that are selectively set in the vehicle (optional functions), the presence or absence of settings is recorded in advance in the memory 16 of the CGW 10, and the report creation unit 12D refers to the memory 16 and creates a report indicating whether the response abnormality is due to a lack of function settings or an abnormality in the device itself, etc.

Next, when there is a communication interruption (step S5, YES), the abnormality detection unit 12C determines the area to be repaired from the interruption location, since the harness (CAN system, power supply system) needs to be repaired, and sets a corresponding DTC (diagnostic trouble code) (step S6). Note that the abnormality detection unit 12C may set a DTC that corresponds to other communication network abnormalities in addition to the communication interruption abnormality. The abnormality detection unit 12C may determine the area of the abnormality when an abnormality in the communication status is detected based on the tester response signal, and set a corresponding DTC (diagnostic trouble code). Furthermore, when an abnormality in the communication status is detected, the abnormality detection unit 12C may transmit a control signal to the ECU A1-C3 to restrict some of the vehicle's functions as necessary.

FIG. 6 is a flowchart for explaining an example of the operation of the ECU of the vehicle communication system according to the embodiment.
Each of the ECUs A1 to C3 receives a tester request signal from the CGW 10 at the tester request signal receiving unit 22A (step S7). The tester request signal receiving unit 22A can identify that the received signal is a tester request signal based on the requested service ID included in the signal received from the CGW 10.

Then, the communication status calculation unit 22B calculates the communication status (OK (normal)/NG (specifies an abnormal part of the communication network, such as the internal memory, communication interface, etc.)) of the ECUs A1-C3 (step S8). The communication status calculation unit 22B first determines whether communication is normal within each of the ECUs A1-C3, and when communication is not normal, it generates communication status information by specifying the abnormal part.

Then, the tester response transmission unit 22C transmits a tester response signal including information indicating the communication status calculated by the communication status calculation unit 22B to the CGW 10 (step S9).

FIG. 7 is a diagram illustrating an example of a determination result of an abnormal portion of a communication network in a vehicle communication system according to an embodiment.
FIG. 7 shows, as an example, a number of combinations of the communication statuses of the ECUs A1, B1, and C1 and the corresponding determination contents.
For example, when the communication statuses of all of the ECUs A1, B1, and C1 are OK (normal), the abnormality detection unit 12C determines that the vehicle communication system is normal.

In addition, when the communication status of ECU A1 and C1 is OK (normal) and the communication status of ECUB1 is NG (abnormal), the abnormality detection unit 12C determines that there is an abnormality in ECUB1 or its branch line (the communication line extending between bus BL1 and ECUB1).
Furthermore, when the communication status of ECU A1 is OK (normal) and the communication statuses of ECUB1 and C1 are NG (abnormal), the abnormality detection unit 12C determines that there is an abnormality in the main line downstream of ECU A1.

In addition, when the communication status of ECU A1 is NG (abnormal) and the communication status of ECUB1 and C1 is OK (normal), the abnormality detection unit 12C determines that there is an abnormality in ECU A1 or its branch line (the communication line extending between bus BL1 and ECU A1).
In addition, when the communication status of ECU A1 and C1 is NG (abnormal) and the communication status of ECUB1 is OK (normal), the abnormality detection unit 12C determines that there is an abnormality in ECU A1 or its branch line, or in ECUC C1 or its branch line (the communication line extending between bus BL1 and ECUC1).

Furthermore, when the communication status of ECUs A1 and B1 is NG (abnormal) and the communication status of ECUC1 is OK (normal), the abnormality detection unit 12C determines that there is an abnormality in ECU A1 or its branch line, or in ECUB1 or its branch line.
Furthermore, when the communication status of all of ECUs A1, B1, and C1 is NG (abnormal), the abnormality detection unit 12C determines that an abnormality has occurred in the main line (bus BL1).

As described above, the vehicle communication system of this embodiment can determine whether each device is connected to the communication network, and if there is a portion that is not connected to the communication network, can determine the location at which the device is disconnected from the network. In other words, for example, when a communication interruption is detected in CGW10, CGW10 can determine where the abnormality is occurring in the communication path between CGW10 and ECUA1-C3.

FIG. 8 is a diagram for explaining an example of an effect of the vehicle communication system according to the embodiment.
Here, an example of an investigation process for identifying an abnormal part using the vehicle communication system of this embodiment when a control abnormality in ECUB3 occurs due to a failure (disruption or abnormal value) in communication from ECUC1 to ECUB3 will be described.

(A) The CGW 10 confirms that a tester request signal is being output from the CGW 10, and determines whether the CGW 10 is operating normally.
(B) CGW 10 checks whether a tester request signal is being output to each of buses BL1-BL3, and determines whether the circuits of buses BL1-BL3 and the joint connectors attached midway along buses BL1-BL3 are normal.

(C) The CGW 10 checks whether all the ECUs A1 to C3 are receiving signals and determines whether all the ECUs A1 to C3 are operating normally.
(D) The CGW 10 checks whether tester response signals are being output from all of the ECUs A1 to C3, and checks whether all of the ECUs A1 to C3 are operating normally.

(E) CGW 10 checks whether a tester response signal is being output to buses BL1-BL3, and determines whether the circuits of buses BL1-BL3 and the joint connectors attached midway along buses BL1-BL3 are normal.
(F) The CGW 10 checks whether the CGW 10 is receiving a signal, and determines whether the CGW 10 is operating normally.

(G) The CGW 10 detects that communication with the ECUB 3 has been interrupted because the CGW 10 is unable to receive a tester response from the ECUB 3.
In the vehicle communication system of this embodiment, the CGW 10 performs the above processes (A) to (G), thereby automatically detecting abnormal parts in the communication network of the vehicle communication system, and creating and outputting a report.

On the other hand, for example, when detecting an abnormality in the communication network of a vehicle communication system without using the above-mentioned tester request signal and tester response signal, a maintenance worker must investigate which of the following (a) to (e) is the cause and identify the part that needs to be repaired.

(a) Check whether a signal is being sent from ECU C1 and determine whether ECU C1 is operating normally.
(b) Check whether a signal is being sent to the communication path between ECUC1 and CGW, and determine whether the circuit of bus BL1 and the joint connector attached midway along bus BL1 are normal.
(c) It is confirmed that CGW 10 is routing from bus BL1 to bus BL3, and it is determined whether CGW 10 is operating normally.

(d) Check whether a signal is being sent to the communication path between CGW 10 and ECUB3, and determine whether the circuit of bus BL3 and the joint connector attached midway along bus BL3 are normal.
(e) It is confirmed whether ECUB 3 is receiving a signal, and it is determined whether ECUB 3 is operating normally.

In other words, in the vehicle communication system and communication network anomaly diagnosis method of this embodiment, the CGW 10 identifies the anomalous part on the communication path where the communication anomaly is occurring, and during maintenance or repair, workers can immediately identify the repair location, eliminating the need to try multiple steps to find the repair location and reducing the repair man-hours.

As described above, this embodiment can provide a method for diagnosing abnormalities in a vehicle communication system and a communication network that reduces the number of repair steps required by workers.

The present invention is not limited to the above-described embodiment, and various modifications can be made in the implementation stage without departing from the gist of the invention. The embodiments may be implemented in appropriate combination, in which case the combined effects can be obtained. Furthermore, the above-described embodiment includes various inventions, and various inventions can be extracted by combinations selected from the multiple constituent elements disclosed. For example, if the problem can be solved and an effect can be obtained even if some constituent elements are deleted from all the constituent elements shown in the embodiment, the configuration from which these constituent elements are deleted can be extracted as an invention.

For example, in the above embodiment, CGW10 sent a tester request signal to all ECUs A1-C3 connected via buses BL1-BL3, but if, for example, the range of the network in which abnormality detection is performed is predetermined, or if there are ECUs that are set not to accept tester request signals, CGW10 may send tester request signals to multiple other ECUs, excluding a portion of the ECUs that have been preset. Then, CGW10 may send reports to multiple other ECUs, excluding a portion of the ECUs that have been preset. Even in this case, the number of repair steps performed by workers can be reduced, as in the above embodiment.

10...CGW
12...Control unit 12A...Tester request signal transmission unit 12B...Tester response signal decoding unit 12C...Abnormality detection unit 12D...Report creation unit 14...Communication unit 16...Memory 22...Control unit 22A...Tester request signal reception unit 22B...Communication status calculation unit 22C...Tester response transmission unit 24...Communication unit 26...Memory BL1-BL3...Bus A1-C3...ECU

A vehicle communication system according to a first aspect of the present invention comprises a CGW connected to a plurality of buses and communicating with a plurality of ECUs connected to the buses, and a plurality of the ECUs, wherein the CGW comprises a tester request signal sending unit that sends a tester request signal to the plurality of ECUs, a tester response signal decoding unit that receives tester response signals sent from the plurality of ECUs and decodes the tester response signals, an abnormality detection unit that detects a communication network abnormality based on a result of decoding the tester response signals, and a report creation unit that generates a report indicating the detection result of the communication network abnormality, wherein the ECU comprises a tester request signal receiving unit that receives the tester request signal from the CGW, a communication status calculation unit that generates information indicating a communication status of the ECU, and a function of generating the tester response signal indicating the communication status and transmitting it to the CGW , and the report creation unit distributes reports regarding all of the plurality of ECUs to all of the plurality of ECUs.

For example, in the above embodiment, the CGW 10 transmits a tester request signal to all ECUs A1-C3 connected via the buses BL1-BL3, but if, for example, the range of the network in which abnormality detection is performed is predetermined, or if there is an ECU set not to receive a tester request signal, the CGW 10 may transmit a tester request signal to a plurality of other ECUs, excluding a portion of the ECUs set in advance. Then, the CGW 10 may transmit a report to a plurality of other ECUs, excluding a portion of the ECUs set in advance. Even in this case, the number of repair steps performed by an operator can be reduced, as in the above embodiment.
[Appendix 1]
The system includes a CGW connected to a plurality of buses and communicating with a plurality of ECUs connected to the buses, and a plurality of the ECUs;
The CGW is
a tester request signal transmitting unit that transmits a tester request signal to the plurality of ECUs;
a tester response signal decoding unit configured to receive tester response signals transmitted from the plurality of ECUs and decode the tester response signals;
an anomaly detection unit that detects an anomaly in the communication network based on a result of decoding the tester response signal;
a report creation unit that creates a report indicating a result of detection of a communication network anomaly;
The ECU is
a tester request signal receiving unit that receives the tester request signal from the CGW;
a communication status calculation unit that generates information indicating a communication status of the ECU;
and a function of generating the tester response signal indicating the communication status and transmitting the tester response signal to the CGW.
Vehicle communication system.
[Appendix 2]
2. The vehicle communication system according to claim 1, wherein the tester request signal includes an identifier indicating that the signal is to be transmitted to all of the ECUs connected to the CGW, and an identifier indicating a request for the tester response signal.
[Appendix 3]
2. The vehicle communication system of claim 1, wherein the tester response signal includes an identifier assigned to the ECU that transmitted the tester response signal, an identifier indicating that the signal is a response signal to the tester request signal, and information indicating the communication status.
[Appendix 4]
2. The vehicle communication system according to claim 1, wherein the report creation unit distributes reports regarding all of the plurality of ECUs to all of the plurality of ECUs.
[Appendix 5]
2. The vehicle communication system according to claim 1, wherein when an abnormality is detected in the communication network, the abnormality detection unit determines an area in which the abnormality exists based on the tester response signal and sets a corresponding DTC.
[Appendix 6]
A method for diagnosing an abnormality in a communication network of a vehicle communication system including a CGW connected to a plurality of buses and communicating with a plurality of ECUs connected to the buses, and a plurality of the ECUs, comprising:
The CGW,
Transmitting a tester request signal to the plurality of ECUs;
receiving a tester response signal indicating a communication status of the ECU;
Decoding the tester response signal;
Detecting a communication network abnormality based on the result of decoding the tester response signal;
generating a report showing the results of the detection of anomalies in the communication network;
A method for diagnosing an abnormality in a communication network, comprising distributing the reports relating to a plurality of the ECUs to the plurality of the ECUs.

Claims (6)

The system includes a CGW connected to a plurality of buses and communicating with a plurality of ECUs connected to the buses, and a plurality of the ECUs;
The CGW is
a tester request signal transmitting unit that transmits a tester request signal to the plurality of ECUs;
a tester response signal decoding unit configured to receive tester response signals transmitted from the plurality of ECUs and decode the tester response signals;
an anomaly detection unit that detects an anomaly in the communication network based on a result of decoding the tester response signal;
a report creation unit that creates a report indicating a result of detection of a communication network anomaly;
The ECU is
a tester request signal receiving unit that receives the tester request signal from the CGW;
a communication status calculation unit that generates information indicating a communication status of the ECU;
and a function of generating the tester response signal indicating the communication status and transmitting the tester response signal to the CGW.
Vehicle communication system. The vehicle communication system of claim 1, wherein the tester request signal includes an identifier indicating that the signal is to be transmitted to all of the ECUs connected to the CGW, and an identifier indicating a request for the tester response signal. The vehicle communication system according to claim 1, wherein the tester response signal includes an identifier assigned to the ECU that transmitted the tester response signal, an identifier indicating that the signal is a response to the tester request signal, and information indicating the communication status. The vehicle communication system according to claim 1, wherein the report creation unit distributes reports regarding all of the plurality of ECUs to all of the plurality of ECUs. The vehicle communication system according to claim 1, wherein the abnormality detection unit, when an abnormality is detected in the communication network based on the tester response signal, identifies the range of the abnormality and sets the corresponding DTC. A method for diagnosing an abnormality in a communication network of a vehicle communication system including a CGW connected to a plurality of buses and communicating with a plurality of ECUs connected to the buses, and a plurality of the ECUs, comprising:
The CGW,
Transmitting a tester request signal to the plurality of ECUs;
receiving a tester response signal indicating a communication status of the ECU;
Decoding the tester response signal;
Detecting a communication network abnormality based on the result of decoding the tester response signal;
generating a report showing the results of the detection of anomalies in the communication network;
A method for diagnosing an abnormality in a communication network, comprising distributing the reports relating to a plurality of the ECUs to the plurality of the ECUs.