JPH04350577A - Diagnostic apparatus for trouble of vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a failure diagnosis device for electronic control devices mounted on various vehicles such as automobiles, industrial vehicles, and construction machinery, that is, on-vehicle electronic control devices, and particularly relates to a failure diagnosis device for accurately and quickly diagnosing failures. The present invention relates to a possible configuration of a vehicle failure diagnosis device.

0002

BACKGROUND OF THE INVENTION Conventional vehicle failure diagnosis devices, for example, as described in Japanese Unexamined Patent Application Publication No. 1-52552, have a failure diagnosis device that is connected to a vehicle-mounted electronic control device to be diagnosed so as to be able to communicate in both directions. Connect the memory cartridge selected according to the used, and furthermore, connect the expert computer and perform fault diagnosis. On the other hand, JP-A-1-52
As described in Publication No. 553, a memory cartridge that is selected and used depending on the vehicle type is connected to a fault diagnosis device that is connected to the in-vehicle electronic control device for two-way communication, and a keyword logic is provided to improve confidentiality. There are also known cases where it was carried.

Furthermore, as described in Japanese Patent Application Laid-Open No. 1-123128, a fault diagnosis device that is connected to an in-vehicle electronic control unit for two-way communication is provided with a keyboard selection means and a display selection means. A method has also been proposed in which a prepared memory cartridge is made removable to simplify diagnosis.

Furthermore, as described in Japanese Patent Application Laid-Open No. 1-123130, an index for failure diagnosis is stored in a memory cartridge, and predetermined data is requested from the electronic control unit when a keyword is input, and the received data and index are combined. In some cases, the information is also displayed to improve work efficiency.

In addition, as described in Japanese Unexamined Patent Publication No. 1-123131, a fault code diagnosed by a fault diagnosis system for an electronic control unit is read out, and predetermined data corresponding to the fault code is transmitted to the on-vehicle electronic control unit. request,
It has also been proposed to display it to facilitate diagnosis.

As described in Japanese Patent Application Laid-Open No. 1-123132, a standard map with load and engine speed as parameters is stored in the ROM of an on-vehicle electronic control unit, and corresponding standard values are read out from the standard map according to keyword input. Methods for displaying and diagnosing are also known.

[0007]

[Problems to be Solved by the Invention] In all of the above-mentioned conventional technologies, vehicle type data and diagnostic procedure data required for failure diagnosis are stored in a memory cartridge or the like and supplied to a failure diagnosis device outside the vehicle. The diagnosis device and the on-vehicle electronic control unit were connected to diagnose the existence and extent of a failure in the on-board electronic control unit.

[0008] Therefore, it is necessary to replace and prepare data such as failure judgment reference values of the vehicle to be diagnosed for each different vehicle model on the fault diagnosis device outside the vehicle, and as the number of target vehicle models increases, the management of this data becomes difficult. There was a drawback that the replacement work was complicated.

[0009] In addition, if the standard values of individual target car models and vehicles are different, if the standard values are installed in a fault diagnosis device outside the vehicle, it is possible to select the standard values of a car model or vehicle that is different from the target car model or vehicle. There was a risk of misdiagnosis.

[0010]Furthermore, even if the vehicle is of the same model, if vehicle performance varies depending on the manufacturing tolerance of each vehicle, the range of normal values must be made wider in order to cope with the variation. , there was a problem that it became impossible to perform highly accurate failure diagnosis.

An object of the present invention is to make it possible to diagnose failures accurately and quickly even if the number of vehicle types to be diagnosed increases, without replacing data such as failure determination reference values for each vehicle. An object of the present invention is to provide a vehicle failure diagnosis device.

Another object of the present invention is to provide a vehicle failure diagnosis that can fundamentally eliminate the possibility of erroneous diagnosis caused by selecting a different model or reference value for a vehicle than the target vehicle, even if the reference values of individual target vehicles are different. The purpose is to provide equipment.

Another object of the present invention is to provide a vehicle failure diagnosis system that can perform highly accurate diagnosis without unnecessarily widening the range of normal values when vehicle performance varies depending on the manufacturing tolerance of each vehicle. It is to provide.

[0014]

[Means for solving the problem] The above purpose is to install a fault diagnosis module in each vehicle that stores data such as a fault diagnosis program and vehicle fault diagnosis values, and to display a general-purpose display on this fault diagnosis module from the outside. - Achieved by connecting the operating device and displaying or printing out the fault diagnosis results.

That is, in order to achieve the above object, the present invention provides a fault diagnosis device for a vehicle equipped with an electronic control device, which includes a vehicle fault diagnosis module that is mounted on the vehicle and executes at least a fault diagnosis procedure for the electronic control device. The present invention proposes a vehicle failure diagnosis device comprising: and a display/operation means connectable to this module for displaying or printing failure diagnosis results.

The vehicle failure diagnosis module includes means for storing failure determination reference values for each vehicle, and the display/operation means includes:
Means is provided for selecting a fault diagnosis procedure for the vehicle fault diagnosis module.

[0017] The vehicle failure diagnosis module can include means for monitoring control signals of the electronic control device, and further inputs a malfunction phenomenon to the electronic control device and diagnoses the control result of the electronic control device with respect to the malfunction phenomenon. A means may also be provided.

[0018] It is desirable that the vehicle failure diagnosis module is provided with a power source that supplies power not only to this module but also to the display/operation means that can be attached to and detached from the module.

[0019]

[Operation] In the present invention, since a failure diagnosis module storing data such as vehicle failure diagnosis values and a failure diagnosis program is installed in each vehicle, data such as failure judgment reference values of the vehicle to be diagnosed are stored in the vehicle. There is no longer a need to prepare and replace data outside the vehicle, and even if the number of target vehicle models increases, the drawback of increased data management and replacement work is eliminated.

Furthermore, even if the standard values of individual target vehicles are different, since the vehicle has a built-in failure diagnosis module that includes standard values suitable for each vehicle type, the standard values of other car types or vehicles can be selected and diagnosed. The risk of making a mistake can be fundamentally eliminated.

Furthermore, even if vehicle performance varies depending on the manufacturing tolerance of each vehicle, failure determination reference values are determined for each vehicle and these values are individually stored in the failure diagnosis module, so that normal operation can be confirmed. Failures in the electronic control device of each vehicle can be diagnosed with high accuracy without unnecessarily widening the range of values.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a vehicle failure diagnosis apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram schematically showing the configuration of an embodiment of a vehicle failure diagnosis apparatus according to the present invention, and FIG. 2 is a perspective view showing an example of the appearance of the vehicle failure diagnosis apparatus of FIG. 1. In these figures, corresponding parts are given the same reference numerals.

The vehicle failure diagnosis apparatus of this embodiment includes a failure diagnosis module 10 connected to the electronic control unit 2 to be diagnosed and mounted on the vehicle, and a display/operator connected to the failure diagnosis module 10 from outside the vehicle. 50.

The fault diagnosis module 10 is connected to the electronic control unit 2 that controls the vehicle, and receives all input/output signals of the electronic control unit 2 from the connection harness 12. Input/output signals of the electronic control device 2 include input signals from the sensor 4, output signals to the actuator 6, and electric power supplied from the vehicle-mounted battery power source 8 at the left end of the figure. The failure diagnosis module 10 includes a ROM 14 that stores failure diagnosis programs and vehicle failure determination reference value data, a RAM 16 that temporarily stores data, a CPU 18 that processes data within the failure diagnosis module, and an internal clock 20. A built-in battery 22 that secures power for the RAM 16, internal clock 20, etc., and an I/O section 24 that controls input/output of signals between the failure diagnosis module 10, the electronic control device 2, and the display/operator 50. , a power supply 26 that stabilizes the power obtained from the in-vehicle battery power supply 8 via the connection harness 12 and supplies power to each circuit in the fault diagnosis module 10 and the power supply 66 in the display/operator 50, and the fault diagnosis module 10. Connector 2 connected to the connection harness 12
8, and a connector 30 that connects the failure diagnosis module 10 to a connection harness 32 to the display/operator 50.

The display/operator 50 includes a display section 52 such as a liquid crystal display, an operation section 54 such as keys, a printing section 56 for printing out display contents, and a display section 52 for displaying, printing out, or transmitting data to the outside. It controls the input/output of signals between the ROM 58 that stores programs that specify output formats, the RAM 60 that temporarily stores data, the CPU 62 that processes data in the display/operator 50, and the failure diagnosis module 10. An I/O unit 64 to control, a power supply 66 that stabilizes the power obtained from the power supply 26 in the failure diagnosis module 10 via the connection harness 32 and supplies power to each circuit in the display/operator 50, and a power switch. 68, an external output buffer 70 for transmitting data, an external connection connector 72, and a connector 7 for connecting the display/operator 50 to the connection harness 32 to the failure diagnosis module 10.
It consists of 4.

FIG. 3 is a flowchart showing an example of the configuration of a diagnostic program of the vehicle failure diagnosis apparatus shown in FIGS. 1 and 2.

[0027] When this diagnostic program is turned on,
It will be initialized and the menu screen will appear.
Diagnosis items can be selected by number from among them. Diagnosis items include, for example, “1. Failure status output, 2. Automatic diagnosis, 3. Individual diagnosis, 4. Problem phenomenon input, 5. Operation status output, 6. Monitoring of control signals, 7. Oil clinic data input, 8. Oil clinic data output, 9. List up standard values, 10. ``End''.

[0028]Each diagnostic program roughly performs the following functions. 1. Failure status output: Displays or prints out the current failure status and past failure status detected by the failure diagnosis module 10. Data on the failure situation is in the failure diagnosis module 10. The failure status and the like are displayed or printed out in a predetermined format based on the data sent from the failure diagnosis module 10 to the display/operator 50.

2. Automatic diagnosis: Each part of the entire system controlled by the electronic control device 2 is automatically diagnosed. If necessary, instruct service personnel to operate levers, etc. The failure status etc. are displayed or printed out in a format determined by the data sent from the failure diagnosis module 10 to the display/operator 50.

3. Individual diagnosis: The program in the failure diagnosis module 10 displays the diagnosis procedure for the currently occurring failure, compares the diagnosis result with reference values, determines the failure, and displays the diagnosis result in a predetermined format. Or print it out.

4. Malfunction phenomenon input: The program in the failure diagnosis module 10 inputs malfunction phenomena into the electronic control unit 2, displays the corresponding malfunction location or diagnostic procedure, and displays or prints out the diagnostic results in a predetermined format.

5. Operating status output: Using the data in the failure diagnosis module 10, grasp the operating status of the vehicle, and use it as preventive maintenance information to determine usage conditions that result in vehicle overload and situations that will cause future vehicle failure due to poor maintenance. Display or print out the operating status in a predetermined format.

6. Monitoring of control signals: Displaying or printing out the control signals of the electronic control unit 2 controlling the vehicle in a predetermined format.

7. Oil clinic data input:
The oil clinic data is stored in the RO in the failure diagnosis module.
Write in M.

8. Oil Clinic Data Output: Display or print out oil clinic data in a defined format.

9. Standard value list display: Display or print out a list of vehicle failure determination standard values in a predetermined format.

10. End: End the vehicle trouble diagnosis program. The operation of the vehicle failure diagnosis apparatus of this embodiment, which is equipped with the apparatus and diagnosis program having such a configuration, will now be described.

First, the fault diagnosis module 10 installed in the vehicle and receiving signals from the electronic control device 2 is
The display/operator 50 is connected by the connection harness 32. The display/operator 50 is powered by the fault diagnosis module 10.
via the connection harness 32.

When the power switch 68 is turned on, the program in the display/operator 50 automatically starts and performs a self-diagnosis of the system, and if the system is normal, the RAM, I/O section, display section, printing section, etc. Initialize and display the menu screen on the display.

[0040] One of the keys on the operation unit 54 is operated to select a diagnosis item from the menu screen. [ENTER] is
This key is pressed to send data entered using the numeric keys to the CPU. [CLEAR] is a key that is pressed to cancel data input using the numeric keys. F1, F2, F
Keys such as 3, . . . are function keys for simplifying operations.

[0041] The signal input using the keys on the operating section 54 is
Through the PU62, I/O section 64, and connection harness 32,
C
Reaching PU18

As shown in FIG. 3, the CPU 18 starts a subprogram corresponding to the signal and executes predetermined data processing.

The data obtained by the CPU 18 is sent to the display/operator 50 via the I/O unit 24 and connection harness 32, processed by the CPU 62, and stored in the ROM 58 or R
According to the output format stored in the AM 60, it is displayed on the display section 52 or printed out on the printing section 56. Note that, if necessary, the data may be output from the external output buffer 70 to an external recording means or the like.

In this embodiment, since a fault diagnosis module storing data such as a fault diagnosis program and vehicle fault diagnosis values is installed in each vehicle, service personnel etc. There is no need to select a program or data such as which failure diagnosis value to use.

[0045] Furthermore, for example, it is easy to store individual vehicle data in the ROM when it is new and compare it with individual vehicle data after long-term operation to manage trends such as how the data has changed. become.

[0046]

According to the present invention, a failure diagnosis module storing data such as a failure diagnosis program and vehicle failure diagnosis values is installed in each vehicle. There is no need to exchange and prepare data outside the vehicle, and even if the number of target vehicle types increases, the drawback of increasing data management and exchange work is eliminated.

[0047] Furthermore, even if the standard values of individual target vehicles are different, since the vehicle has a built-in failure diagnosis module that includes standard values suitable for each car model, it is possible to select the standard values of other car models and make a diagnosis incorrectly. This can fundamentally eliminate the fear.

Furthermore, even if vehicle performance varies depending on the manufacturing tolerance of each vehicle, failure determination reference values are determined for each vehicle and these values are individually stored in the failure diagnosis module, so that normal Failures in the electronic control unit of each vehicle can be diagnosed with high accuracy without expanding the range of values.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a vehicle failure diagnosis device according to the present invention.

FIG. 2 is a perspective view showing an example of the appearance of the vehicle failure diagnosis device shown in FIG. 1;

FIG. 3 is a flowchart showing an example of the configuration of a diagnostic program of the vehicle failure diagnosis device shown in FIG. 1;

[Explanation of symbols]

2 Electronic control device 4 Sensor 6 Actuator 8 In-vehicle battery power supply 10 Vehicle failure diagnosis module 12 Connection harness 14 ROM 16 RAM 18 CPU 20 Internal clock 22 Built-in battery 24 I/O section 26 Power supply 28 Connector 30 Connector 32 Connection harness 50 Display/operator 52 Display section 54 Operation section 56 Printing Department 58 ROM 60 RAM 62 CPU 64 I/O section 66 Power supply 68 Power switch 70 External output buffer 72 External connection connector 74 Connector

Claims (6)

[Claims] 1. A fault diagnosis device for a vehicle equipped with an electronic control device, comprising: a vehicle fault diagnosis module mounted on the vehicle that executes at least a fault diagnosis procedure for the electronic control device; and a vehicle fault diagnosis module connectable to the vehicle fault diagnosis module. A vehicle failure diagnosis device comprising display/operation means for displaying or printing the failure diagnosis results. 2. The vehicle failure diagnosis apparatus according to claim 1, wherein the vehicle failure diagnosis module includes means for storing failure determination reference values for each of the vehicles. 3. The vehicle failure diagnosis apparatus according to claim 1, wherein the display/operation means includes means for selecting the failure diagnosis procedure of the vehicle failure diagnosis module. Diagnostic equipment. 4. The vehicle failure diagnosis device according to claim 1, wherein the vehicle failure diagnosis module includes means for monitoring a control signal of the electronic control device. Vehicle failure diagnosis device. 5. The vehicle failure diagnosis device according to claim 1, wherein the vehicle failure diagnosis module inputs a malfunction phenomenon to the electronic control device, and performs an evaluation of the electronic control device in response to the malfunction phenomenon. A vehicle failure diagnosis device characterized by comprising means for diagnosing control results. 6. The vehicle failure diagnosis device according to claim 1, wherein the vehicle failure diagnosis module includes a power source that supplies power to the module and the display/operation means. Characteristic vehicle failure diagnosis device.