JPH0684343U - Failure diagnosis device for vehicle control device - Google Patents

Abstract

(57) [Abstract] [Purpose] To accurately perform a failure diagnosis of a plurality of control devices for a vehicle that communicates control data with each other. [Structure] The self-diagnosis execution means 5 of the electronic system A is provided with an identification signal S when a failure is judged by the self-diagnosis function.
The individual failure signal RR containing S is used as the failure diagnosis communication means 2
To the communication line 10 for failure diagnosis via. Fault diagnostic device
20 is provided with a failure determination means 28 for determining a failed control device based on the failure signal RR, further determining a failed control target based on the identification signal SS, and performing a failure diagnosis of the control target. It was

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a failure diagnosis device in a plurality of control devices for a vehicle, in which control data are mutually communicated.

[0002]

[Prior art]

 For example, in an automobile, in order to perform fuel injection control of an engine, ignition timing control, or shift control of an automatic transmission, a control device for each control is provided, and each control is simplified by sharing functions. We are trying to improve efficiency and shorten execution time by parallel operation.

Here, the control data are mutually communicated between the control devices so that the control data can be used in each control device. For example, a control device for engine control that performs fuel injection control and ignition timing control of the engine to a control device for torque converter control that controls the automatic transmission can control the injection of fuel, etc. by digital signals through multiple communication lines. The control data is communicated and the optimum shift point is selected to maintain optimal torque performance and fuel efficiency.

As described above, the applicant of the present invention relates to a failure diagnosing device for a vehicle control device in which control data are mutually communicated among a plurality of control devices. Is proposed in.

[0005]

[Problems to be solved by the device]

 However, in a vehicle equipped with a plurality of control devices, when diagnosing these electronic systems, an arbitrary system is designated by means of serial communication or the like to perform the diagnosis. In other words, which system is to be diagnosed depends on the judgment of the diagnosing person. However, recently, as described above, the control of the vehicle has become a control system in which the control devices mounted on the vehicle influence each other, so that it is difficult for the diagnostician to make a fault diagnosis. Is coming.

The present invention has been made in view of the above circumstances, and it is possible to accurately perform a failure diagnosis of a plurality of control devices for a vehicle in which control data are mutually communicated. An object is to provide a diagnostic device.

[0007]

[Means for Solving the Problems]

 For this reason, the present invention provides a fault diagnosis communication in which a plurality of vehicle control devices each equipped with a microcomputer having a self-diagnosis function communicate control data with each other, and are commonly connected to the plurality of control devices. In a failure diagnosis device for a vehicle control device provided with a line, when a failure is judged by a predetermined control device by the self-diagnosis function, the vehicle control device outputs an identification signal for identifying a control target to be controlled. A failure signal output means for outputting the included individual failure signal to the failure diagnosis communication line is provided, and the failure diagnosis device connected to the failure diagnosis communication line of the vehicle controller is based on the individual failure signal A failure determination means is provided for determining the failed control device, determining the failed control target based on the identification signal, and executing the failure diagnosis of the control target.

[0008]

[Action]

 In such a configuration, the plurality of vehicle control devices communicate control data with each other to control each other, but when a predetermined control device determines that a failure has occurred due to the self-diagnosis function, the failure signal output means fails. Outputs individual failure signals to the diagnostic communication line. Here, since the failure signal is individually output for each control device, the control device can be specified by the failure signal, and since the failure signal includes an identification signal that enables identification of the control target, The controlled object can be specified.

On the other hand, a failure diagnosis device is connected to the failure diagnosis communication line of the vehicle control device, but the failure diagnosis device is provided with a failure determination means, and based on the individual failure signal. The failed control device is determined, and the failed control target is determined based on the identification signal. Then, after the failed control device and the control target in the control device are specified, a failure diagnosis of the control target is executed.

Therefore, the failed control device and the control target in the control device can be specified, and the failure diagnosis of the control target can be surely executed. You can quickly judge the contents.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the vehicle is equipped with an electronic system A, an electronic system B, an electronic system C, etc., and control data is mutually communicated between the respective systems to enable the electronic systems A, B to communicate with each other. , C, D, ... Can use the control data.

Next, the electronic systems A, B, C, D, etc. will be described, but the electronic system A will be described as a representative example. The electronic system A is connected to the other electronic systems B, C, D, etc. via the communication line by the other system and the communication means 2 for failure diagnosis. Includes a communication line 10 for failure diagnosis, and the electronic systems A, B, C, D, etc. are connected to each other via the communication line 10 for failure diagnosis.

A fault diagnosing device 20 as shown in FIG. 2 is connected to the terminal 10a of the fault diagnosing communication line 10. This electronic system A is provided with a central processing unit (CPU) 1 to which another system and communication means 2 for failure diagnosis are connected, and the central processing unit 1 includes a normal control program and a failure diagnosis device 20. A ram 4 provided with a program execution means 3 for executing the sent diagnostic execution program, a ram 6 provided with a self-diagnosis execution means 5 for executing self-diagnosis, a ROM 7 storing determination data and the like, and an input / output device. The (I / O) 8 is connected to the input / output device 8, and the sensors S1 to Sn and the output portions D1 to Dn are connected to the input / output device 8, respectively. Here, as a configuration according to the present invention, the self-diagnosis execution means 5 includes an individual signal SS including an identification signal SS that enables identification of a control target to be controlled when a failure is determined in the electronic system A by the self-diagnosis function. The failure signal RR is output to the failure diagnosis communication line 10 through the other system and the failure diagnosis communication means 2.

Here, the failure signal RR has the format shown in FIG. 3, and includes the system number and the failure system number as shown in FIG. 4 as the identification signal SS. On the other hand, the fault diagnosing device 20 is provided with a central processing unit (CPU) 21 to which a fault diagnosing communication means 22 is connected, and the central processing unit 21 stores a ram 23, a fault diagnosing program, and the like. 24, a ROM 25 storing a communication procedure data program and a diagnostic device operating means 27 to which a screen touch keyboard 26 is connected.

Further, as a configuration according to the present invention, the failure diagnosing device 20 determines a failed control device based on, for example, the failure signal RR output from the electronic system A (in the case of the present embodiment, Further, there is provided a failure determination means 28 for determining a failed control target based on the identification signal SS and performing a failure diagnosis for the control target.

Next, the mode of the diagnostic control will be described with reference to the control flow on the electronic system A side shown in FIG. 5 and the control flow on the fault diagnosing device 20 side shown in FIG. The electronic system A executes a self-diagnosis in step 1 (denoted as S1 in the figure; the same applies hereinafter) and determines whether or not the system is normal (step 2). When it is determined that the system is not normal, a failure signal is output to the failure diagnosis communication line 10, but since the failure diagnosis communication line 10 is commonly connected to each electronic system, It is necessary to judge whether or not the failure diagnosis communication line 10 is free. Therefore, if it is determined that the system is not normal, the process proceeds to step 3 to determine whether another system is outputting a failure signal to the failure diagnosis communication line 10 in order to output a failure signal. .

If another system is not outputting a failure signal, the process proceeds to step 4, and the failure signal RR including the identification signal SS is output to the failure diagnosis communication line 10. The identification signal SS includes the system number as data from 00h to FFh and the fault system number as data from 00h to FFh. In step 5, the failure signal RR output in step 4 is monitored, and it is checked whether or not there is a transmission error by determining whether or not it matches the transmission data.

Here, the failure signal RR is output from each electronic system to the failure diagnostic device 20, and it is determined which electronic system the failure signal RR relates to. Therefore, in step 6, it is judged whether or not the electronic system A is called from the failure diagnosing device 20. If not called, the process proceeds to step 7 and waits for a predetermined time in order to secure the transmission time of the failure signal RR including other electronic systems. Then, if the call is not made even after the elapse of the predetermined time, the process returns to step 4.

On the other hand, in step 6, when it is determined that the electronic system A is called from the failure diagnosing device 20, the failure diagnosing device 20 makes a failure for the failure signal RR output by the electronic system A. This is the case where the diagnosis is to be performed, and the process proceeds to step 8 to execute the data link between the fault diagnosing device 20 and the electronic system A. In step 9, the diagnostic program instructed by the failure diagnosing device 20 is executed by the program executing means 3.

On the other hand, in the failure diagnosing device 20, in step 21, it is judged whether or not the failure signal RR including the identification signal SS is received, and if it is received, in steps 22 and 23, Store and store the system number and the fault system number. In step 24, the stored system number is determined, and it is determined whether the electronic system having the system number can execute the diagnosis with its own diagnostic program.

If it is determined that the data can be executed, the process proceeds to step 25, and the data link between the failure diagnostic device 20 and the electronic system A is executed. In step 26, it is judged which fault diagnosis program should be executed for the data-linked electronic system (in this case, electronic system A) based on the fault system number, and an appropriate diagnostic program is instructed.

The embodiment described above is an example in which a failure occurs in the electronic system A and the data link between the failure diagnostic device 20 and the electronic system A is executed. Since the failure diagnosis is performed, it becomes possible to quickly determine the electronic system in which the failure has occurred and the details of the failure, and workability is greatly improved.

[0023]

[Effect of device]

 According to the present invention, as described above, the vehicle control device includes the identification signal that enables the control device to identify the control target to be controlled when the self-diagnosis function determines that the predetermined control device has failed. A failure signal output means for outputting an individual failure signal to the failure diagnosis communication line is provided, and a failure diagnosis device connected to the failure diagnosis communication line of the vehicle control device is provided to the failure diagnosis device based on the individual failure signal. The control device that has failed is determined, and the control target that has failed is determined based on the identification signal, and the failure determination means that executes the failure diagnosis of the control target is provided. It can be done accurately and quickly, greatly improving workability. In other words, there is an effect that the failure diagnosis device of the vehicle control device can be easily used by anyone without requiring artificial selection or skill.

[Brief description of drawings]

FIG. 1 is a control block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram of a fault diagnostic device showing an embodiment of the present invention.

FIG. 3 is a drawing showing a transmission format.

FIG. 4 is a drawing explaining the contents of transmission.

FIG. 5 is a control flowchart on the electronic system side.

FIG. 6 is a control flowchart on the fault diagnosing device side.

[Explanation of symbols]

 1 central processing unit (CPU) 2 other system and communication means for failure diagnosis 4 ram 6 ram 10 communication line for failure diagnosis 20 failure diagnostic device 28 failure determination means A electronic system

Claims (1)

[Scope of utility model registration request] 1. A plurality of vehicle control devices each equipped with a microcomputer having a self-diagnosis function communicate control data with each other, and a fault diagnosis communication line commonly connected to the plurality of control devices is provided. In a failure diagnosis device for a vehicle control device, when a failure is determined by a predetermined control device by the self-diagnosis function, the vehicle control device includes an individual signal including an identification signal that enables identification of a control target to be controlled. A failure signal output means for outputting the failure signal to the failure diagnosis communication line, and the failure diagnosis device connected to the failure diagnosis communication line of the vehicle control device is controlled based on the individual failure signal. A vehicle control device characterized by comprising a failure determination means for determining a device, determining a failed control target based on the identification signal, and performing a failure diagnosis of the control target. Of the failure diagnosis device.