JP2530410Y2 - Vehicle failure diagnosis device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vehicle failure diagnosis device for diagnosing current and past failures of a vehicle.

[Conventional technology]

2. Description of the Related Art In recent years, an automobile has a self-diagnosis function, and a function check and a failure diagnosis of the vehicle are performed by an off-board failure diagnosis apparatus body or the like. For example, "Automotive technology" VO1.35, No.9,19
81.1064-1066 "Self-diagnosis of engine electronic control system and fail software", JP-A-64-83434 and
As disclosed in Japanese Patent Application Laid-Open No. 1-209334, a failure diagnostic device having various diagnostic functions is introduced.

[Problems to be solved by the invention]

However, when detecting a failure, the above-described vehicle failure diagnosis device stores the content in a memory of a control unit mounted on the vehicle, and reads out the content at a service factory later using the off-board vehicle failure diagnosis device main body, or uses communication means. The contents of the record were sent to a service factory for diagnosis.

However, due to the number of memories in the control unit, the recorded contents do not record transient failures, or even if all failures are stored, whether the failure was transient, Can not diagnose whether it is broken. Therefore, there is a problem when viewed from the standpoint of the service factory.

The present invention has been made in view of the above, and it is possible to output a request for a diagnosis result in any of a current failure and a past failure according to an instruction from the failure diagnosis device main body side, that is, for a vehicle to be answered. An object of the present invention is to provide a failure diagnosis device.

[Means for solving the problem]

In order to achieve the above object, the configuration of the present invention is a vehicle failure diagnosis device including a vehicle control unit mounted on a vehicle and a failure diagnosis device main body connected to the vehicle control unit. On the control unit side, a self-diagnosis mode discriminating means for discriminating whether a request from the failure diagnosis device body is a current failure or a past failure, a memory for storing diagnosis result information, and a case where a current diagnosis result is requested Current failure discriminating means for monitoring diagnosis items, judging normal / abnormal from the monitoring results, writing information on abnormal parts to a memory and sending information on normal or abnormal parts to the main body of the failure diagnostic apparatus, and past diagnostic results Is provided, a past failure reading means for reading a past failure from the memory, and a data communication means. Data communication means connected to the data communication means of the control unit for a vehicle, the diagnosis request means for generating a diagnosis request, characterized in that a display means for displaying the data signal.

[Action]

When a command requesting a predetermined current or past self-diagnosis is sent from the failure diagnosis device body to the vehicle control unit mounted on the vehicle via the data communication means, the self-diagnosis mode determination means of the vehicle control unit is provided. To determine whether the request is for a current diagnosis result or a request for a past diagnosis result. When the self-diagnosis mode determination means determines that the request is for a past diagnosis result, the past failure reading means transmits the information of the result of the diagnosis performed in advance to the failure diagnosis apparatus main body. On the other hand, when the request for the diagnosis result is present in the self-diagnosis mode determination means, the current failure determination means executes the self-diagnosis, and transmits the diagnosis result information at that time to the failure diagnosis device body. The current diagnosis result is stored in the RAM of the vehicle control unit as the past diagnosis result.
The failure information is recorded regardless of which self-diagnosis mode is executed. The current self-diagnosis mode is repeated until a stop command is received from the failure diagnosis device body to the vehicle control unit, and the self-diagnosis is performed and information communication to the failure diagnosis device body is performed.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of a vehicle failure diagnosis apparatus according to the present invention.

A is a vehicle control unit mounted on the vehicle,
B is a failure diagnosis device main body provided separately from the vehicle.

The vehicle control unit A determines whether the request from the ROM 1, which is a fixed storage device, the self-diagnosis executing means 2, the memory (RAM) 3 for recording a diagnosis result, and the failure diagnosis device body B is a current failure or a past failure. It comprises a self-diagnosis mode discriminating means 4 for discriminating, a current fault discriminating means 5 for discriminating a current fault, a past fault reading means 6 for reading out past faults, and a data communication means 7. A RAM 3 is connected to the self-diagnosis executing means 2, and the RAM stores information on diagnosis results (independent memories of the present and the past). RAM3
Is connected to the current failure determining means 5 and the past failure reading means 6, and the current failure determining means 5 determines the current failure according to the set items.
Is designed to read past failures recorded in the RAM3.

The failure diagnosis device main body B includes a ROM 8 as a fixed storage device and a data communication unit 7 on the vehicle control unit A side.
The communication system comprises a data communication means 9 connected to the communication terminal, a diagnosis request means 10 for generating a diagnosis request, and a display means 11 for displaying a data signal. Diagnosis requesting means 10 includes keyboard interpreting means 12
And a screen touch keyboard 13 connected to the data communication means 9 to generate a request for a past failure or a current failure. The display means 11 is composed of a data calculation means 14, a data code conversion means 15, a display drive means 16, and a display 17, and is connected to the data communication means 9 and the ROM 8 to display based on a data signal. .

FIG. 2 shows a flowchart for diagnosing past and present failures of a vehicle using such a failure diagnosis device.

In step S1, the data communication means 9 on the failure diagnosis device main body B side is connected to the data communication means 7 on the vehicle control unit A side to perform a data link between the vehicle control unit A and the failure diagnosis device main body B. Next, the process proceeds to step S2, and in step S2, it is determined whether or not there is a diagnostic instruction from the failure diagnosis device main body B. If there is no diagnostic instruction, the process proceeds to step S3 and waits for a predetermined time. When the standby time has elapsed, the failure diagnosis is stopped, the communication relationship such as the circuit and interface of the vehicle control unit A is reset, and the control returns to the normal control (steps S4, S5, S6). In step S2, if there is a diagnosis instruction in response to a request from the failure diagnosis device main body B, the process proceeds to steps S7 and S8, where the self-diagnosis mode determination means 4 determines whether a past self-diagnosis request or a current self-diagnosis Is determined. In the case of the current self-diagnosis request, the currently set diagnosis item is monitored by the current failure determination means 5 and the normal,
An abnormality is determined, and information on the abnormal part is written into the RAM 3 and executed (steps S10, S11, S12). Then, in step S13, information on the normal or abnormal part is transmitted to the failure diagnosis device main body B via the mutually connected data communication means 7, 9. It repeats until there is a diagnosis end instruction in step S14, and when there is an end instruction, it moves to step S4 and stops the failure diagnosis. Repeat if there is no instruction to end the diagnosis. The steps
If there is a past diagnosis request in S7, the process proceeds to step S15, where the failure information in the RAM 3 is read by the past failure reading means 6 and transmitted to the failure diagnosis apparatus main body B. The transmission is repeated until a diagnosis end instruction is issued in step S16. When the end instruction is issued, the process moves to step S4 to stop the failure diagnosis. When there is no past or present self-diagnosis request in steps S7 and S8, the process proceeds to another diagnostic mode execution in step S9,
It will wait for the diagnosis instruction in step S2.

In this way, current and past failures of the vehicle can be diagnosed.

[Effect of the invention]

As described above, the present invention provides a vehicle control unit with a self-diagnosis mode determining means for determining whether a request from a failure diagnosis device main body is a current failure or a past failure, and a memory for storing diagnosis result information. If the current diagnosis result is requested, monitor the diagnosis item, determine whether it is normal or abnormal from the monitoring result, write the information of the abnormal part to the memory, and write the information of the normal or abnormal part to the failure diagnosis device body. A current failure determination means for sending, a past failure reading means for reading a past failure from a memory when a past diagnosis result is requested, and a data communication means, and the failure diagnosis device body includes a vehicle control unit. By providing a data communication unit connected to the data communication unit, a diagnosis request unit for generating a diagnosis request, and a display unit for displaying a data signal, Failure of standing, it is possible the output the diagnosis result in either mode of past failures. In the case of a failure such as a case where a plurality of failure events have occurred and this event has disappeared, etc., a combination of a part that has failed and a failure event that continues to occur is currently not occurring. Diagnosis can be made for a plurality of failure events from information such as a combination of a failure event and a failure site that has occurred in the past (there is no failure at present). In the current self-diagnosis mode, the self-diagnosis is repeatedly executed, and the diagnosis result information is transmitted to the failure diagnosis apparatus body each time. Also, such an effect can be obtained that a simple diagnosis can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of a vehicle failure diagnosis apparatus according to the present invention, and FIG. 2 is a flowchart thereof. A: Vehicle control unit B: Failure diagnosis device body 1, 8 ROM 2 Self-diagnosis execution means 3 Memory (RAM) 4 Self-diagnosis mode determination means 5 Current failure determination means 6 … Past fault reading means 7, 9… Data communication means 10… Diagnosis request means 11… Display means.

Claims (1)

(57) [Scope of request for utility model registration] 1. A failure diagnosis device for a vehicle, comprising: a vehicle control unit mounted on a vehicle; and a failure diagnosis device main body connected to the vehicle control unit, wherein the failure diagnosis device is provided on the vehicle control unit side. Self-diagnosis mode determining means for determining whether a request from the main unit is a current failure or a past failure, a memory for storing diagnosis result information, and monitoring and monitoring of diagnosis items when a current diagnosis result is requested The current failure judgment means for judging normal or abnormal from the result, writing the information of the abnormal part to the memory and sending the information of the normal or abnormal part to the main body of the failure diagnosis apparatus, and the memory when the past diagnosis result is required. Fault readout means for reading out past faults from the vehicle, and data communication means, and the vehicle control unit Data communication means connected to Tsu City of data communication means, a diagnosis request means for generating a diagnosis request, vehicle fault diagnostic apparatus characterized by comprising a display means for displaying the data signal.