JP4747683B2 - On-vehicle electronic control system, fault diagnosis method thereof, and on-vehicle electronic control device - Google Patents

Description

  The present invention relates to an on-vehicle electronic control system that performs cooperative operation by transmitting and receiving data between a plurality of on-vehicle electronic control devices, a failure diagnosis method thereof, and an on-vehicle electronic control device.

  Various electrical components mounted on the vehicle are electrically controlled by an electronic control unit called an ECU (Electronic Control Unit) according to the state of the vehicle detected by various sensors, operation input from the driver, and the like. . The ECU that controls the operation of various electrical components generally has a function to monitor its own state (self-diagnosis function), and if any abnormality is detected, the code data representing the abnormality is diagnosed abnormally. Remember as a result. When the abnormality appears as a vehicle failure, a mechanic connects a predetermined diagnostic machine to the ECU, reads out the abnormality diagnosis result stored in the ECU, and analyzes the cause of the failure.

  By the way, in recent years, a distributed and cooperative in-vehicle electronic control system has been constructed that connects a plurality of ECUs to a multiplex communication network, exchanges information with each other, and cooperates with each other to realize one function. . In such a distributed / cooperative in-vehicle electronic control system, due to a potential problem of a certain ECU, even other ECUs may reach an abnormal state.

  As a specific example, for example, a first ECU that reads a detection value of a wheel speed sensor, a second ECU that receives wheel speed data from the first ECU, and calculates vehicle speed data based on the received wheel speed data. Consider the cooperative operation of the ECU and the third ECU that receives vehicle speed data from the second ECU and performs predetermined processing based on the received vehicle speed data. In this case, when a failure occurs in the wheel speed sensor and the detected value of the wheel speed sensor becomes an abnormal value, the first ECU stores an abnormality diagnosis result indicating an abnormality of the wheel speed sensor, and the second ECU The abnormality diagnosis result indicating the abnormality of the wheel speed data is stored, and the third ECU stores the abnormality diagnosis result indicating the abnormality of the vehicle speed data. Thus, in the distributed / cooperative in-vehicle electronic control system, each ECU that detects an abnormality stores only the abnormality diagnosis result directly related to the ECU.

  As described above, in the conventional general vehicle-mounted electronic control system, each ECU that detects an abnormality stores only an abnormality diagnosis result directly related to the ECU. Even when an abnormality occurs, it is often difficult to find the true cause that is latent in other ECUs even if the abnormality diagnosis result of the ECU that detected the abnormality is read out, even for a skilled mechanic There is a problem that it takes a lot of time to finally identify the cause of the failure and the burden is large.

In order to reduce the burden on such a mechanic and improve the workability of failure analysis, for example, a technique described in Patent Document 1 has been proposed. In Patent Document 1, as a diagnostic machine used for fault diagnosis of an on-vehicle electronic control system that realizes one function by cooperative operation of a plurality of ECUs, it leads to a functional chain and fault detection of the entire on-vehicle electronic control system. There has been disclosed a technique for automatically identifying a cause of a failure based on an abnormality diagnosis result read from each ECU in accordance with a predetermined determination logic using information stored in advance on causal information.
JP-A-3-32967

  However, in the technique described in Patent Document 1 described above, it is necessary to create a determination logic for a diagnostic machine after grasping all the cooperative operations by each ECU for realizing a certain function. There was a problem that it was difficult. In particular, in the technique described in Patent Document 1, since it is necessary to create a determination logic for each vehicle having a different system configuration, the amount of information becomes enormous and defects in the determination logic itself are likely to occur. was there. Further, in the technique described in Patent Document 1, since the order and combination of the function chain change every time a function is added even in the same vehicle, the determination logic is corrected accordingly. There was a problem that it was necessary and caused deterioration of efficiency.

  The present invention was devised in view of the conventional situation as described above, and when performing cooperative operation by transmitting / receiving data between a plurality of ECUs, other ECUs are linked in sequence due to an abnormality of one ECU. Provided is an in-vehicle electronic control system, a failure diagnosis method thereof, and an in-vehicle electronic control device that can easily and appropriately specify the cause of a failure without using complicated determination logic even when the ECU detects an abnormality. The purpose is to do.

  The present invention solves the above-described problems by causing a plurality of in-vehicle electronic control devices that perform cooperative operations to execute the following processing. In other words, in the present invention, each of the plurality of in-vehicle electronic control devices stores an abnormality diagnosis result obtained as a result of self-diagnosis, and receives a first diagnosis result read command for reading out the abnormality diagnosis result from the outside. If the abnormality diagnosis result includes an input abnormality from another in-vehicle electronic control device, the second diagnosis result for reading out the abnormality diagnosis result stored in the other in-vehicle electronic control device A read command is transmitted to the other on-vehicle electronic control device. Then, the abnormality diagnosis result obtained as a response to the second diagnosis result read command from the other in-vehicle electronic control device is transmitted as the response to the first diagnosis result read command. Send to the original. Thus, in the present invention, the abnormality diagnosis results that are related to each other by the plurality of on-vehicle electronic control devices are traced to the abnormality diagnosis result indicating the abnormality that is the cause of the failure, and the abnormality diagnosis result is read out as the diagnosis result. It will be sent to the command source.

  According to the present invention, even when another on-vehicle electronic control device detects an abnormality in a chain due to an abnormality of one on-vehicle electronic control device, the cause of the failure can be easily and appropriately used without using a complicated determination logic. Can be specified.

  Hereinafter, specific embodiments of an on-vehicle electronic control system to which the present invention is applied will be described in detail with reference to the drawings.

  As shown in FIG. 1, the in-vehicle electronic control system includes a plurality of ECUs as in-vehicle electronic control devices connected to each other via a predetermined network bus 100, and transmits and receives data between the ECUs via the network bus 100. It is configured as a network type control system capable of performing cooperative operation. In the present embodiment, for simplicity, three ECUs 10A, 10B, and 10C are connected to the network bus 100, and a case where a cooperative operation is performed between the three ECUs 10A, 10B, and 10C will be described as an example. Of course, the number of ECUs is not limited to this example.

  Further, in this in-vehicle electronic control system, a diagnostic machine 210 for performing a failure diagnosis of the in-vehicle electronic control system can be connected to each of the ECUs 10A, 10B, and 10C via a dedicated harness 200. . The diagnosis device 210 transmits a diagnosis result read command for reading out an abnormality diagnosis result, which will be described later, to the ECUs 10A, 10B, and 10C, and displays the abnormality diagnosis result obtained as a response. To be operated by a mechanic. In this embodiment, the diagnostic device 210 is connected to each ECU 10A, 10B, 10C via the dedicated harness 200. However, the diagnostic device 210 is connected to each ECU 10A, 10B, 10C via the network bus 100. It is also possible to connect, and in this case, the dedicated harness 200 can be dispensed with.

  The ECUs 10A, 10B, and 10C constituting the in-vehicle electronic control system are respectively controlled by the function execution units 20A, 20B, and 20C that execute control functions required for the ECUs and the control states in the function execution units 20A, 20B, and 20C. Diagnostic control units 30A, 30B, and 30C. Here, the self-diagnosis refers to an operation of monitoring the self control state and detecting any abnormality.

  The function execution units 20A, 20B, 20C of the ECUs 10A, 10B, 10C are respectively function control units 21A, 22A, ... 23A, 21B, 22B, ... 23B, 21C, 22C, ... for each function.・ Has 23C These function control units 21A, 22A, ... 23A, 21B, 22B, ... 23B, 21C, 22C, ... 23C store parameters necessary for calculation in addition to inputs from the outside. Each function is realized by performing predetermined arithmetic processing using these external inputs and stored parameters. In the present embodiment, the sensor 41 is connected to the function control unit 22A of the ECU 10A, the sensor 42 and the actuator 43 are connected to the function control unit 23A of the ECU 10A, and the sensor 44 is connected to the function control unit 23C of the ECU 10C. explain. Each of these function control units 21A, 22A,... 23A, 21B, 22B,... 23B, 21C, 22C, ... 23C can be configured by either hardware or software.

  Diagnosis control units 30A, 30B, and 30C of ECUs 10A, 10B, and 10C (hereinafter collectively referred to as diagnosis control unit 30 when they are not particularly distinguished) respectively indicate the state of each ECU as shown in FIG. An abnormality monitoring result storage comprising an abnormality monitoring unit 31 to be monitored and a non-volatile memory for storing, as an abnormality diagnosis result, code data (hereinafter referred to as an abnormality code) representing the abnormality when the abnormality monitoring unit 31 detects an abnormality. Operation instruction comprising a diagnostic communication control unit 33 for controlling transmission / reception of abnormality diagnosis results between the unit 32 and an external communication application program, and a nonvolatile memory in which processing contents corresponding to the contents of the abnormality diagnosis results are described It has a table 34 and a control logic unit 35 that comprehensively controls processing related to self-diagnosis.

  In the on-vehicle electronic control system to which the present invention is applied as described above, the operation control of the actuator 43 connected to the ECU 10A is performed as follows, for example.

  First, as shown in FIG. 3, when the function control unit 23C in the ECU 10C inputs the output signal D1 of the sensor 44, the output signal D2 indicating the sensor value is supplied to the ECU 10B via the network bus 100. At this time, the ECU 10C monitors the signal input / output state by the abnormality monitoring unit 31 in the diagnosis control unit 30C, and stores the corresponding abnormality code in the abnormality diagnosis result storage unit 32 when an abnormality is detected.

  Subsequently, when the function control unit 23B in the ECU 10B receives the output signal D2 via the network bus 100, a predetermined sensor is used for the output signal D2 using parameters stored in the function control unit 23B. A value correction calculation is performed, and an output signal D3 indicating a correction sensor value as a calculation result is supplied to the ECU 10A via the network bus 100. At this time, the ECU 10B monitors the input / output state of the signal by the abnormality monitoring unit 31 in the diagnosis control unit 30B, and stores the corresponding abnormality code in the abnormality diagnosis result storage unit 32 when an abnormality is detected.

  Further, the function control unit 22A in the ECU 10A inputs the output signal D4 of the sensor 41, performs a predetermined calculation, and supplies the output signal D4 as the output signal D5 to the function control unit 23A. The function control unit 23A inputs the output signal D3 via the network bus 100, calculates the control parameter of the actuator 43 based on the output signal D6 of the sensor 42 and the output signal D5 supplied from the function control unit 22A, By supplying the output signal D7 to the actuator 43, the operation of the actuator 43 is controlled. In addition, the function control unit 23A inputs the output signal D8 of the actuator 43. At this time, the ECU 10A monitors the signal input / output state by the abnormality monitoring unit 31 in the diagnosis control unit 30A, and stores the corresponding abnormality code in the abnormality diagnosis result storage unit 32 when an abnormality is detected.

  As described above, in the in-vehicle electronic control system to which the present invention is applied, the operation of the actuator 43 is controlled by performing a cooperative operation across the ECUs 10A, 10B, and 10C.

  Here, when some failure occurs in the sensor 44 and an abnormal value is output as the output signal D1 from the sensor 44, the function control unit 23C in the ECU 10C outputs the abnormal value as the output signal D2. Become. In this case, the ECU 10 </ b> C detects the abnormality of the output signal D <b> 1 of the sensor 44 by the abnormality monitoring unit 31 and stores an abnormality code indicating the abnormality of the sensor 44 in the abnormality diagnosis result storage unit 32.

  Further, the function control unit 23B in the ECU 10B calculates an abnormal value by a sensor value correction calculation in response to the output signal D2 being an abnormal value from the ECU 10C, and outputs the abnormal value as the output signal D3. Become. In this case, the ECU 10B detects the input abnormality of the output signal D2 and the sensor value correction calculation abnormality by the abnormality monitoring unit 31, and the abnormality code indicating the input abnormality of the output signal D2 and the abnormality code indicating the sensor value correction calculation abnormality. Is stored in the abnormality diagnosis result storage unit 32.

  Further, the function control unit 23A in the ECU 10A calculates an abnormal value as a control parameter of the actuator 43 in response to the output signal D3 (D5) being an abnormal value from the ECU 10B, and outputs the abnormal value as the output signal D7. The actuator 43 is output and abnormal control of the actuator 43 is performed. In this case, the ECU 10A detects the input abnormality of the output signal D3, the control parameter calculation abnormality of the actuator 43, and the control abnormality of the actuator 43 by the abnormality monitoring unit 31, and an abnormality code indicating the input abnormality of the output signal D3, An abnormality code indicating a control parameter calculation abnormality of the actuator 43 and an abnormality code indicating a control abnormality of the actuator 43 are stored in the abnormality diagnosis result storage unit 32.

  If an abnormality occurs in the operation of the actuator 43 due to an abnormality in the output signal D7 from the ECU 10A, the abnormal operation of the actuator 43 appears as an abnormality in the vehicle behavior, and the user recognizes the occurrence of the failure. When the user who has recognized the occurrence of the failure brings the vehicle into the vehicle maintenance factory, a mechanic at the vehicle maintenance factory connects the diagnostic device 210 to the in-vehicle electronic control system to perform failure diagnosis. That is, a mechanic at the vehicle maintenance shop connects the diagnostic device 210 to the vehicle electronic control system and performs an operation for reading out the abnormality diagnosis result, thereby reading out a diagnosis result reading command for reading out the abnormality diagnosis result on the dedicated harness 200. And data to which a code for identifying the ECU to be read is added. Then, when an abnormality diagnosis result is transmitted from the ECU to be read to the diagnosis device 210 as a response to the diagnosis result read command, the contents of the abnormality diagnosis result are displayed on the diagnosis result display screen of the diagnosis device 210. Analyze the location of failure.

  Here, in the conventional general in-vehicle electronic control system, the abnormality diagnosis result stored in each ECU is only the abnormality code directly related to the ECU, and each ECU reads out the diagnosis result from the diagnostic device 210. When the command was received, only the abnormal code directly related to the ECU was transmitted to the diagnostic machine 210. That is, in the above-described example, when the mechanic operates the diagnosis device 210 and transmits a diagnosis result read command with the ECU 10A as a read target, the ECU 10A responds to the diagnosis result read command as an abnormality diagnosis result storage unit. 32, for example, an abnormality code indicating an input abnormality of the output signal D3, an abnormality code indicating a control parameter calculation abnormality of the actuator 43, and an abnormality indicating a control abnormality of the actuator 43, for example. The code is transmitted to the diagnostic machine 210. As a result, only the abnormality directly related to the ECU 10A is displayed on the diagnosis result display screen of the diagnostic machine 210.

  For this reason, even when referring to the information displayed on the diagnostic result display screen of the diagnostic machine 210, it is often difficult to immediately identify the location where the failure has occurred. It is necessary to repeat the operation of reading out the abnormality diagnosis result from the ECU, and to comprehensively judge the information displayed one after another on the diagnostic machine 210 to find the true cause of the failure. It took a lot of time to identify, and there was a problem that the burden on the mechanic became large.

  On the other hand, in the in-vehicle electronic control system to which the present invention is applied, the cause of the failure can be easily and appropriately specified by causing each ECU to execute the following processing, so that The problem in a conventional on-vehicle electronic control system is solved. In the following, the processing in the ECU 10A will be described as an example, but in the in-vehicle electronic control system to which the present invention is applied, the same processing is performed in the other ECUs 10B and 10C.

  In the in-vehicle electronic control system to which the present invention is applied, as shown in FIG. 4, the ECU 10 </ b> A has an abnormality monitoring unit 31 in the diagnostic control unit 30 </ b> A that inputs to the ECU 10 </ b> A, the function control units 21 </ b> A, 22 </ b> A,. The calculation result and the control state of the actuator 43 are monitored, and when any abnormality is detected among these monitoring targets, the corresponding abnormality code is stored in the abnormality diagnosis result storage unit 32 as the abnormality diagnosis result. .

  Further, when receiving the diagnostic result read command C1 from the diagnostic machine 210 or another ECU, the diagnostic communication control unit 33 notifies the control logic unit 35 of the diagnostic result read command C1. In response to this, the control logic unit 35 inquires whether or not any abnormality code is stored as the abnormality diagnosis result in the abnormality diagnosis result storage unit 32. If no abnormality code is stored, the diagnosis communication is performed. A result transmission command indicating “no abnormality” is issued to the control unit 33. Then, the diagnostic communication control unit 33 transmits diagnostic result information indicating “no abnormality” as a response to the abnormality diagnostic result read command C1. On the other hand, when any abnormality code is stored as an abnormality diagnosis result in the abnormality diagnosis result storage unit 32, the control logic unit 35 refers to the operation instruction table 34 as processing contents corresponding to the content of the abnormality code. The process is switched according to the contents described in the operation instruction table 34.

  That is, when the abnormality code stored in the abnormality diagnosis result storage unit 32 is an abnormality code indicating an abnormality in the output signal D3 supplied from the ECU 10B, the control logic unit 35 acquires the abnormality diagnosis result of the ECU 10B. Accordingly, the diagnostic communication control unit 33 is requested to issue a diagnostic result read command C2 to the ECU 10B. In response to this, the diagnostic communication control unit 33 issues a diagnostic result read command C2 to the ECU 10B, and waits for a response from the ECU 10B to the abnormality diagnostic result read command C2. When the abnormality code stored in the ECU 10B is transmitted from the ECU 10B as a response to the abnormality diagnosis result read command C2, the abnormality code transmitted from the ECU 10B is used as the diagnosis result as a response to the diagnosis result read command C1. It transmits to the diagnostic machine 210 and other ECUs that are the transmission source of the read command C1. Further, when there is no response from the ECU 10B to the diagnostic result read command C2, the diagnostic communication control unit 33 outputs an abnormal code indicating an input abnormality from the ECU 10B as a response to the diagnostic result read command C1. It transmits with respect to the diagnostic machine 210 which is a transmission origin, and other ECU.

  Further, when the abnormality code stored in the abnormality diagnosis result storage unit 32 corresponds to the abnormality of the ECU 10A, the control logic unit 35 stores the abnormality code stored in the abnormality diagnosis result storage unit 32. The diagnostic communication control unit 33 is requested to transmit the diagnostic result read command C1 to the diagnostic machine 210 or other ECU that is the transmission source. In response to this, the diagnostic communication control unit 33 responds to the diagnostic result read command C1 by using the diagnostic machine 210 that is the transmission source of the diagnostic result read command C1 or the like as the response to the diagnostic result read command C1. To the ECU.

  FIG. 5 is a flowchart showing a flow of a series of processes executed by each ECU when a diagnostic result read command is received in the in-vehicle electronic control system to which the present invention is applied.

  First, each ECU of the on-vehicle electronic control system to which the present invention is applied receives a diagnostic result read command C1 from the diagnostic machine 210 or another ECU in step S1, and then diagnoses an abnormality in the abnormality diagnostic result storage unit 32 in step S2. A process of reading out the abnormal code stored as a result is performed. If the ECU determines in step S3 that an abnormality code as an abnormality diagnosis result is not stored in the abnormality diagnosis result storage unit 32, the diagnosis result read command C1 received in step S1 in step S4. As a response to the above, diagnostic result information indicating “no abnormality” is transmitted to the diagnostic machine 210 and other ECUs that are the transmission source of the diagnostic result read command C1. On the other hand, when the ECU determines that any abnormality code is stored in the abnormality diagnosis result storage unit 32, the ECU refers to the operation instruction table 34 to determine the content of the abnormality code in step S5.

  Here, if the ECU determines in step S6 that the content of the abnormal code does not indicate an input abnormality from another ECU, that is, if the content of the abnormal code indicates that it is abnormal. In step S7, as a response to the diagnosis result read command C1 received in step S1, the abnormality code stored in the abnormality diagnosis result storage unit 32 is used as the diagnosis machine 210 that is the transmission source of the diagnosis result read command C1. And transmitted to other ECUs. On the other hand, when the ECU determines that the content of the abnormality code indicates an input abnormality from another ECU, the ECU transmits a diagnostic result read command C2 to the other ECU in step S8.

  In step S9, the ECU determines whether or not an abnormality code stored in the other ECU has been transmitted from the other ECU as a response to the diagnosis result read command C2, and the abnormality is detected from the other ECU. If there is a code transmission, in step S10, as a response to the diagnostic result read command C1 received in step S1, the abnormal code received from the other ECU is used as the diagnostic machine 210 that is the transmission source of the diagnostic result read command C1. It transmits to other ECU. On the other hand, if there is no response to the diagnostic result read command C2 even after a predetermined time has elapsed (in the case of negative determination in step S11), the ECU has failed in an input unit that inputs data from another ECU. In step S12, as a response to the diagnostic result read command C1 received in step S1, an abnormal code indicating a failure of the input unit is used as a diagnostic machine 210 or other ECU that is the transmission source of the diagnostic result read command C1. Send to.

  In the on-vehicle electronic control system to which the present invention is applied, the ECU 10A, 10B, 10C constituting the on-vehicle electronic control system performs the above-described processing, and thus the cooperative operation over the ECUs 10A, 10B, 10C. When any failure occurs in the function realized by the above, it becomes possible to easily and appropriately specify the cause of the failure.

  That is, in the in-vehicle electronic control system to which the present invention is applied, for example, as shown in FIG. 6, when an abnormality occurs in the operation of the actuator 43 connected to the ECU 10A due to a failure of the sensor 44 connected to the ECU 10C, the ECU 10A When the diagnosis device 210 is connected to the ECU 10A and the diagnosis result read command is transmitted from the diagnosis device 210 to the ECU 10A, the diagnosis control unit 30A of the ECU 10A indicates an abnormality of the output signal D3 from the ECU 10B as the abnormality diagnosis result of the ECU 10A. In response to the storage of the abnormal code, a diagnostic result read command is transmitted to the ECU 10B.

  When a diagnostic result read command is transmitted from the ECU 10A to the ECU 10B, the diagnostic control unit 30B of the ECU 10B stores an abnormality code indicating an abnormality of the output signal D2 from the ECU 10C as an abnormality diagnosis result of the ECU 10B. In response, a diagnostic result read command is transmitted to the ECU 10C.

  When a diagnostic result read command is transmitted from the ECU 10B to the ECU 10C, the diagnostic control unit 30C of the ECU 10C receives the fact that an abnormality code indicating a failure of the sensor 44 is stored as an abnormality diagnosis result of the ECU 10C. As a response to the diagnostic result read command from, an abnormal code indicating a failure of the sensor 44 is transmitted to the ECU 10B.

  When an abnormal code indicating failure of the sensor 44 is transmitted from the ECU 10C to the ECU 10B, the diagnosis control unit 30B of the ECU 10B indicates the failure of the sensor 44 received from the ECU 10C as a response to the diagnosis result read command from the ECU 10A. The abnormal code is transmitted to the ECU 10A.

  When an abnormal code indicating failure of the sensor 44 is transmitted from the ECU 10B to the ECU 10A, the failure of the sensor 44 received from the ECU 10B by the diagnosis control unit 30A of the ECU 10A as a response to the diagnosis result read command from the diagnostic machine 210 Is transmitted to the diagnosis device 210. Thereby, the diagnostic machine 210 can detect a failure of the sensor 44 connected to the ECU 10C, and can display that fact on the diagnostic result display screen.

  As described above, in the in-vehicle electronic control system to which the present invention is applied, when the cooperative operation by a plurality of ECUs is performed, all the ECUs located downstream are abnormal due to the abnormality of the ECU located upstream. Is detected, the diagnosis result read command is sent to the ECU located one step upstream from the ECU located downstream, and the cause of the abnormality is inquired. The cause of the abnormality can be notified to the diagnosis device 210 by responding sequentially to the ECU located one step downstream from the ECU that has occurred. Therefore, in the on-vehicle electronic control system to which the present invention is applied, it is only necessary to connect the diagnostic device 210 to the ECU located on the most downstream side and send a diagnostic result read command to the upstream side that is the true cause of the failure. It is possible to grasp the abnormality of the ECU that is positioned.

  As described above in detail, in the in-vehicle electronic control system to which the present invention is applied, each of the plurality of ECUs 10A, 10B, 10C stores the abnormality diagnosis result obtained by self-diagnosis in the abnormality diagnosis result storage unit 32. When the diagnosis result read command for reading the abnormality diagnosis result is received from the outside, the abnormality diagnosis result stored in the abnormality diagnosis result storage unit 32 includes information indicating an input abnormality from another ECU. I try to check whether or not. When the abnormality diagnosis result stored in the abnormality diagnosis result storage unit 32 includes information indicating an input abnormality from another ECU, the abnormality diagnosis result stored in the other ECU is read out. An abnormality diagnosis result read command is transmitted to the other ECU, and a diagnosis result obtained from the other ECU is transmitted to the transmission source of the abnormality diagnosis result read command as a response to the abnormality diagnosis result read command. Like to do.

  Thus, according to the on-vehicle electronic control system to which the present invention is applied, the abnormality diagnosis results that are related to each other by the plurality of ECUs are traced to the abnormality diagnosis result that indicates the abnormality that is causing the failure, and the abnormality diagnosis is performed. The result can be transmitted to the transmission source of the diagnostic result read command, and even if another ECU detects an abnormality in a chain due to an abnormality of one ECU, it is easy without using complicated determination logic. And the cause of failure can be specified appropriately.

  Further, in this in-vehicle electronic control system, the control logic unit 35 in the plurality of ECUs 10A, 10B, and 10C includes the contents of the abnormality code as the abnormality diagnosis result when the diagnosis communication control unit 33 receives the diagnosis result read command. And the operation instruction table 34 in which the processing contents corresponding thereto are described, the processing is switched according to the content of the abnormality code stored in the abnormality diagnosis result storage unit 32.

  Specifically, when the abnormality code stored in the abnormality diagnosis result storage unit 32 is an abnormality code indicating an input abnormality from another ECU, the control logic unit 35 of each ECU 10A, 10B, 10C The diagnosis communication control unit 33 is requested to issue an abnormality diagnosis result read command to another ECU. When the abnormality code stored in the abnormality diagnosis result storage unit 32 corresponds to the abnormality of the ECU, the control logic unit 35 sends the abnormality code to the transmission source of the abnormality diagnosis result read command. It requests the diagnostic communication control unit 33 to transmit.

  As described above, in the on-vehicle electronic control system to which the present invention is applied, each ECU 10A, 10B, and the ECU 10A, 10B, with a very simple determination logic that switches processing according to the content of the abnormality code stored in the abnormality diagnosis result storage unit 32. What is necessary is just to comprise the control logic part 35 in 10C, and a failure cause can be specified easily and appropriately, without using the complicated determination logic of the whole vehicle-mounted electronic control system.

  The on-vehicle electronic control system described above is an application example of the present invention, and the present invention is not limited to the above example, and may be concrete as long as it does not depart from the technical idea of the present invention. It goes without saying that various changes can be made in the hardware configuration and details of processing in each ECU. For example, in the above-described on-vehicle electronic control system, each ECU 10A, 10B, 10C is connected by one network bus 100, and data transmission / reception between each ECU 10A, 10B, 10C is performed via this network bus 100. However, the ECUs 10A, 10B, and 10C may be connected by individual dedicated harnesses, and data transmission and reception between the ECUs 10A, 10B, and 10C may be performed using these dedicated harnesses. Further, in the above-described on-vehicle electronic control system, each of the ECUs 10A, 10B, and 10C transmits the abnormal code itself to the transmission source of the diagnostic result read command as a response to the diagnostic result read command. The specific content of the abnormality may be transmitted as a response to the diagnostic result read command.

It is a block diagram which shows schematic structure of the vehicle-mounted electronic control system to which this invention is applied. It is a block diagram which shows the structure of the diagnostic control part of each ECU in the vehicle-mounted electronic control system to which this invention is applied. It is a figure for demonstrating the signal which flows at the time of the operation control of an actuator in the vehicle-mounted electronic control system to which this invention is applied. It is a figure for demonstrating the process which the diagnostic control part of ECU10A performs in the vehicle-mounted electronic control system to which this invention is applied. 5 is a flowchart showing a flow of a series of processes executed when each ECU receives a diagnostic result read command in the in-vehicle electronic control system to which the present invention is applied. It is a figure for demonstrating a mode that the failure cause of the function implement | achieved by the cooperative operation | movement over several ECUs is specified in the vehicle-mounted electronic control system to which this invention is applied.

Explanation of symbols

10A, 10B, 10C ECU
20A, 20B, 20C Function execution unit 30A, 30B, 30C Diagnosis control unit 31 Abnormality monitoring unit 32 Abnormality diagnosis result storage unit 33 Diagnostic communication control unit 34 Operation instruction table 35 Control logic unit 41, 42, 44 Sensor 43 Actuator 100 Network bus 200 Dedicated harness 210 Diagnostic machine

Claims (7)

In an in-vehicle electronic control system that performs cooperative operation by transmitting and receiving data between multiple in-vehicle electronic control devices,
Each of the plurality of in-vehicle electronic control devices stores an abnormality diagnosis result obtained as a result of self-diagnosis, and when receiving a first diagnosis result read command for reading out the abnormality diagnosis result from the outside, When the abnormality diagnosis result includes an input abnormality from another vehicle-mounted electronic control device, a second diagnosis result read command for reading the abnormality diagnosis result stored in the other vehicle-mounted electronic control device is issued. An abnormality diagnosis result transmitted as a response to the second diagnostic result read command from the other on-vehicle electronic control device and transmitted to the other on-vehicle electronic control device as a response to the first diagnostic result read command An on-vehicle electronic control system, wherein the first diagnostic result read command is transmitted to a transmission source. Each of the plurality of in-vehicle electronic control devices is
An abnormality diagnosis result storage means for storing an abnormality diagnosis result obtained as a result of self-diagnosis;
Diagnostic communication control means for controlling transmission and reception of abnormality diagnosis results stored in the abnormality diagnosis result storage means;
Table means in which processing contents corresponding to the contents of the abnormality diagnosis result are described;
Control logic means for comprehensively controlling processing related to the self-diagnosis,
The control logic means refers to the table means when the first diagnosis result read command is received by the diagnosis communication control means, and the contents of the abnormality diagnosis result stored in the abnormality diagnosis result storage means The in-vehicle electronic control system according to claim 1, wherein the process is switched according to the operation.   When the abnormality diagnosis result stored in the abnormality diagnosis result storage means includes an input abnormality from another in-vehicle electronic control device, the control logic means is responsive to the other in-vehicle electronic control device. The diagnosis communication control means is requested to issue the second abnormality diagnosis result read command, and is transmitted from the other in-vehicle electronic control device as a response to the second diagnosis result read command by the diagnosis communication control means. When the abnormality diagnosis result is received, the abnormality diagnosis result transmitted from the other in-vehicle electronic control device is used as the response of the first diagnosis result read command, and the transmission source of the first diagnosis result read command The in-vehicle electronic control system according to claim 2, wherein the diagnostic communication control unit is requested to transmit to the vehicle.   When the abnormality diagnosis result stored in the abnormality diagnosis result storage means is only corresponding to the abnormality of the in-vehicle electronic control device, the control logic means responds to the first diagnosis result read command. The in-vehicle electronic control system according to claim 2, wherein the diagnosis communication control means is requested to transmit the abnormality diagnosis result to a transmission source of the first diagnosis result read command. In the on-vehicle electronic control system failure diagnosis method for performing cooperative operation by transmitting and receiving data between a plurality of on-vehicle electronic control devices,
Storing the abnormality diagnosis results obtained by the self-diagnosis of each of the plurality of in-vehicle electronic control devices;
A step of receiving, from the outside, a first diagnostic result read command for one of the plurality of in-vehicle electronic control devices to read out the abnormality diagnosis result;
When the abnormality diagnosis result stored in the one in-vehicle electronic control device includes information indicating an input abnormality from another in-vehicle electronic control device, the abnormality stored in the other in-vehicle electronic control device Transmitting a second diagnostic result read command for reading a diagnostic result from the one in-vehicle electronic control device to the other in-vehicle electronic control device;
The first in-vehicle electronic control device uses the diagnosis result obtained as a response to the second diagnosis result read command from the other in-vehicle electronic control device as the response to the first diagnosis result read command. A failure diagnosis method for an in-vehicle electronic control system, comprising: a step of transmitting a diagnosis result read command to a transmission source. In an in-vehicle electronic control device that performs a cooperative operation by transmitting and receiving data to and from other in-vehicle electronic control devices,
An abnormality diagnosis result storage means for storing an abnormality diagnosis result obtained as a result of self-diagnosis;
Diagnostic communication control means for controlling transmission and reception of abnormality diagnosis results stored in the abnormality diagnosis result storage means;
Table means in which processing contents corresponding to the contents of the abnormality diagnosis result are described;
Control logic means for comprehensively controlling processing related to the self-diagnosis,
The control logic means, when the diagnostic communication control means receives a first diagnostic result read command from the outside for reading the abnormality diagnosis result stored in the abnormality diagnosis result storage means, the table means The process is switched according to the content of the abnormality diagnosis result stored in the abnormality diagnosis result storage means, and the abnormality diagnosis result stored in the abnormality diagnosis result storage means is transferred from another in-vehicle electronic control device. If the input abnormality is included, the second abnormality diagnosis result read command for reading the abnormality diagnosis result stored in the other vehicle-mounted electronic control device is sent to the other vehicle-mounted electronic control device. The diagnostic communication control unit is requested to issue, and the other as a response to the second diagnostic result read command by the diagnostic communication control unit When the abnormality diagnosis result transmitted from the in-vehicle electronic control device is received, the abnormality diagnosis result transmitted from the other in-vehicle electronic control device is used as a response to the first diagnosis result read command. An in-vehicle electronic control device which requests the diagnostic communication control means to transmit to a transmission source of a diagnostic result read command.   When the abnormality diagnosis result stored in the abnormality diagnosis result storage means is only corresponding to the abnormality of the in-vehicle electronic control device, the control logic means responds to the first diagnosis result read command. The in-vehicle electronic control device according to claim 6, wherein the diagnosis communication control means is requested to transmit the abnormality diagnosis result to a transmission source of the first diagnosis result read command.

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