JPH0552892A - Failure diagnostic tester for vehicle-borne electronic equipment - Google Patents

Abstract

PURPOSE:To make it possible to diagnose the state of deterioration or failure of a sensor accurately and quickly. CONSTITUTION:A vehicle-borne electronic control device 5 and the tester 1 for diagnosis of failure are connected together through a communication circuit 10 and a sensor signal input circuit 12 is provided for the tester 1 for diagnosis of failure. Data obtained from an externally provided sensor 15 and data of a sensor 6 obtained from the electronic control device 5 are displayed simultaneously by using a display device 2 on the tester 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure diagnostic tester for an on-vehicle electronic device for quickly and accurately diagnosing various electronic devices mounted on an automobile.

[0002]

2. Description of the Related Art FIG. 4 is a diagram for explaining a method of performing a failure diagnosis with a conventional failure diagnosis tester (hereinafter referred to as a tester). In FIG. 2, a storage device 3 in which a diagnostic program and data are stored, and a keyboard 4 for inputting operations. Reference numeral 6 denotes a sensor, and 7 denotes an actuator, which are connected to the electronic control unit 5 via a wiring 8 and a connector 9, respectively. Reference numeral 11 is a communication-dedicated circuit for performing communication between the tester 16 and the electronic control unit 5, and 10 is for connecting the tester 16 and the electronic control unit 5 via the connector 9 to transmit and receive various data. It is a communication line.

Next, the operation will be described. As a method of performing a failure diagnosis using the above failure diagnosis apparatus, for example, when the electronic control apparatus 5 sets the data obtained from the sensor 6 to 2V, the tester 16 transfers the information of the sensor 6 to the digital code via the communication line 10. Request to the electronic control unit 5 by
The electronic control unit 5 converts the data obtained from the sensor 6 into a digital code, the tester 16 receives the data via the communication line 10, and based on the data (reception information) stored in the storage unit 3. It is converted again and displayed on the display device 2 as "sensor 6 = 2V". Similarly, for the actuator 7, if the drive pulse width being driven by the electronic control unit 5 is 10 mSec, then "actuator 7 = 10 mSec" is displayed on the display unit 2 by the above procedure.

[0004]

Since the conventional failure diagnosing device performs the diagnosis in the above procedure, the data converted by the electronic control device 5 is displayed on the display device 2 and the sensor 6 is operated. It was difficult to judge the deterioration status and failure status.

The present invention has been made to solve the above problems, and an object thereof is to obtain a failure diagnosis tester for an on-vehicle electronic device capable of accurately and quickly determining the deterioration status and failure status of a sensor. And

[0006]

A failure diagnosis tester for an on-vehicle electronic device according to the present invention includes an electronic control device having various sensors and actuators, a storage device, a sensor signal input circuit, a communication dedicated circuit, and a display device. , A failure diagnostic tester equipped with a keyboard is capable of mutually transmitting and receiving data using a communication line, and various communication data information and sensor signal input information are displayed on the display device of the tester. It is a thing.

[0007]

In the failure diagnosis tester according to the present invention, the sensor signal input circuit is built in the tester, and the signal obtained from the external sensor can be converted into physical quantity data for display, whereby the deterioration status of the sensor or The failure status can be accurately discovered.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a failure diagnosis tester (hereinafter referred to as a tester), which includes a display device 2, a storage device 3 in which a failure diagnosis program and data are stored, and a sensor signal input circuit 12. An electronic control unit 5 is connected to the electronic control unit 5 via a wire 8 and a connector 9, respectively. Reference numeral 11 is a communication dedicated circuit for performing communication between the tester 1 and the electronic control unit 5, and 10 is a communication line connecting the tester 1 and the electronic control unit 5 via the connector 9.

Reference numeral 13 is an external sensor connector connected to the sensor signal input circuit 12, 14 is a harness for transmitting signals from the external sensor, and 15 is an external sensor. The external sensor 15 is used in the same manner as the sensor 6, and the external sensor 15 is a good product.

Next, the operation of the present invention will be described with reference to the flowchart of FIG. The operator installs the external sensor 15 under the same environmental conditions as the installation location of the sensor 6 and starts diagnosis.

In step S10, the electronic control unit 5 inputs various sensors and switch signals, and then in step S1.
In step 1, a calculation for performing a control operation is performed based on the input signal captured in step S10, and step S1
In 2, the calculation result obtained in step S11 is output to various actuators.

The tester 1 detects the sensor 6 in step S1.
Of the data is requested to the electronic control unit 5 via the communication line 10, and the electronic control unit 5 receives the communication request from the tester 1 in step S13, and then proceeds to step S14. In step S14, the electronic control unit 5 reads the data from the input device or the internal memory, and transmits the data to the tester 1 via the communication line 10 in step S15.

The tester 1 receives the data of the sensor 6 in step S2, converts the data received in step S3 into a display code so that it can be displayed on the display device 2 of the tester 1, and in step S4, converts the display code. Display the data. Further, in step S5, the signal measured by the external sensor 15 is converted into physical quantity data, in step S6 the converted data is converted into a display code, and in step S7, the converted data is displayed.

By repeating the above cycle, it becomes possible to simultaneously monitor the data processed inside the electronic control unit 5 and the data measured by the external sensor as shown in the tester display example of FIG.

Although the data of the sensor 6 and the external sensor 15 are displayed as voltage values in FIG. 3, if the sensors 6 and 15 are temperature measuring sensors, the data conversion in steps S3 and S6 is performed. At times, it is also possible to display by temperature unit by converting into temperature data.

If the sensor 6 and the external sensor 15 generate pulses synchronously or generate alternating current, their synchronization and frequency may be calculated and displayed in time units or frequency units. It is possible. In addition, electric resistance and pressure can be similarly converted and displayed.

[0017]

As described above, according to the present invention, a program for comparing the data of the sensor to be diagnosed with the data of the external sensor by incorporating the sensor signal input circuit in the conventional fault diagnosing tester. By incorporating in the storage device, it is possible to accurately and quickly find out the deterioration status or failure status of the sensor.

[Brief description of drawings]

FIG. 1 is a diagram showing a connection relationship for carrying out a failure diagnosis of an on-vehicle electronic device according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation according to an embodiment of the present invention.

FIG. 3 is a diagram showing an example of a display screen of a display device according to an embodiment of the present invention.

FIG. 4 is a diagram showing a connection relationship for performing a failure diagnosis of a conventional vehicle-mounted electronic device.

[Explanation of symbols]

 1 Failure Diagnostic Tester 2 Display Device 3 Storage Device 4 Keyboard 5 Electronic Control Device 6 Sensor 7 Actuator 10 Communication Line 11 Communication Dedicated Circuit 12 Sensor Signal Input Circuit 13 External Sensor Connector 15 External Sensor

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[Procedure amendment]

[Submission date] May 15, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

BACKGROUND OF THE INVENTION FIG. 4, there is described a method of performing failure diagnosis in the conventional trouble diagnosis tester (hereinafter referred to as tester). In the figure, 16 is a tester for performing fault diagnosis, display 2, a storage device 3 in which a diagnostic program and data are stored, and a keyboard 4 for inputting operations. Reference numeral 6 denotes a sensor, and 7 denotes an actuator, which are connected to the electronic control unit 5 via a wiring 8 and a connector 9, respectively. Reference numeral 11 is a communication-dedicated circuit for performing communication between the tester 16 and the electronic control unit 5, and 10 is for connecting the tester 16 and the electronic control unit 5 via the connector 9 to transmit and receive various data. It is a communication line.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

Reference numeral 13 is an external sensor connector connected to the sensor signal input circuit 12, 14 is a harness for transmitting signals from the external sensor, and 15 is an external sensor. The external sensor 15 is the same as the sensor 6.
It is of a specification , and the external sensor 15 is a good product.

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

Claims (1)

[Claims] 1. An electronic control device including various sensors and actuators, and a failure diagnosis tester including a storage device, a sensor signal input circuit, a communication dedicated circuit, a display device, and a keyboard, are used for data communication using a communication line. A failure diagnosis tester for an on-vehicle electronic device, which enables mutual transmission and reception, and displays various communication data information and sensor signal input information on a display device of the failure diagnosis tester.