JP2000146768A - Failure diagnostic device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly grasp failure information and to improve the efficiency of repairing operation by equipping a multiple display device with a multiple display control device for displaying warning, numbers, or characters according to the operation of a display-switching means. SOLUTION: When a set/reset switch 2b is not in operation and a sensor connected to an engine control unit 15 fails, a failure signal arrives at the control unit 15 and the control unit 15 specifies the details of the failure according to the type of sensors and sends the ON/OFF signal with a pattern corresponding to the details of the failure to a multiple display drive circuit 18, and 'engine control' is displayed or characters are lit on a diagnosis monitor 1. By warehousing a vehicle in a repair shop and operating a switch 2b, a failure code for indicating the details of failure can be recalled by numbers and displayed on the monitor 1. By repairing failed parts and at the same time inspecting an area around them and operating the switch 2b again, a diagnosis clear signal is transmitted to an input end 15C of the control unit 15 for clearing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a failure diagnosis device for a control device mounted on a vehicle.

[0002]

2. Description of the Related Art Conventionally, there are known various computer-controlled self-diagnosis devices, that is, vehicle failure diagnosis devices which are equipped with a diagnosis and detect abnormalities of an engine, a transmission, a brake and the like. The device shown in FIG. 4 is one of them.

[0003] This technology uses an engine control unit 15,
Transmission control unit 16, brake control unit 1
7, a plurality of sensors (not shown) are arranged, and when these sensors detect an abnormality, a warning signal for turning on / off a warning lamp is transmitted from a unit to which the sensor is connected. By flashing the display portion of the multiplex display means 51 corresponding to the control unit, it is displayed which unit related to the control device of the vehicle is abnormal.

[0004] In order to determine which part of the control device has a failure, the vehicle is brought to a maintenance shop and a code is displayed on the failure diagnosis tester 11 via the communication lines 13 and 14. When the failure diagnosis tester 11 is not provided, the diagnostic switches 52, 53, 54, etc., connected to the respective control units, are operated by a maintenance worker or a user's manual operation to determine the type of failure. Corresponding, for example, Morse code (----,--, etc.)
Is output from the control unit, the morse code is read by the multi-warning control circuit 58, converted into a numerical display, and displayed on the multiplex display means 51. In order to repair the failure of each control device and clear the storage of the failure information of each control unit, the clear switches 55, 56, 57, etc. are opened and closed by manual operation as in the case of display. I have.

[0005]

Therefore, in this technique, the diagnostic switch is sequentially operated in a repair shop using a failure diagnostic tester, or if there is no failure diagnostic tester, the diagnostic switch is searched for. Since the door is manually opened and closed, the operation is complicated and time-consuming, and it takes time and effort to generate a Morse code which is a blinking signal and read the pattern of the Morse code.

In view of the above-mentioned circumstances, an object of the present invention is to provide a failure diagnosis apparatus for a vehicle which can display a failure state of each control device with a simple operation.

[0007]

Means for Solving the Problems In order to solve such problems, the invention described in claim 1 is proposed. The present invention provides a control unit that determines an abnormality of a control device, and outputs an ON-OFF signal corresponding to the content of the abnormality and a serial signal corresponding to the ON-OFF signal when an abnormality occurs. , A multiplex display device capable of displaying a warning display of a device corresponding to, and displaying numbers or characters according to a serial signal, a display switching means capable of switching the display of the multiplex display device, and an operation of the display switching means. Accordingly, since the multiplex display device is provided with a multiplex display control device for performing a warning display or displaying numbers or characters, when an abnormality occurs, a warning display of the target device is performed, and by a switch operation of the display switching unit,
The failure information based on the serial signal can be immediately displayed on the multiplex display device, and detailed failure information can be quickly grasped, so that the repair work can be performed efficiently.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the drawings. However, the dimensions, materials, shapes, relative positions, and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, unless otherwise specified, and are merely illustrative examples. Not just.

FIG. 1 is a block diagram showing an arrangement of a diagnostic monitor and a mode select switch of a vehicle failure diagnosis apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram of the failure diagnosis apparatus. 3 is a flowchart of a failure diagnosis device.
In FIG. 1, a diagnostic monitor 1 as a multiplex display device is shown.
Is disposed in the meter cluster, and near the right hand thereof, an operation switch 2 as display switching means is disposed.

The switch 2 has a mode select switch operating section 2a at the upper stage and a set / reset switch operating section 2b at the lower stage. Specifically, the set / reset switch operating section 2b is used as a display switching means. Function. The upper mode select switch operation unit 2a is
For example, the switch is operated when it is desired to display the current running fuel consumption, running distance, and the like on the diagnostic monitor 1. Since the switch is not directly related to the present invention, description thereof will be omitted.

When a failure occurs in a sensor of an engine control unit or a mission control unit, which will be described later, the diagnostic monitor 1 uses a warning signal to display characters "engine control" and "T / M control" as shown in FIG. It lights up, and where the engine or the mission is in failure is visually recognized by operating the set / reset switch operation unit 2b by displaying "01" or "10" as shown on the display units 1b and 1c. . Note that, in the present embodiment, a numerical display is given as an example, but a character display may be used.

In FIG. 2, a failure diagnosis device 10 includes an engine control unit 15, a mission control unit 16,
A plurality of sensors (not shown) are arranged in the brake control unit 17, respectively. Each control unit 15, 16,
The output terminals 15a, 16a and 17a of the CPU 17 are CPUs, respectively.
19 are connected to 19 input terminals 19a, 19b, 19c.

The multiplex display driving circuit 18 is connected to a CPU (Central Processing Element) 19 and also to the diagnostic monitor 1 and, under the control of the CPU 19, a time interval corresponding to a failure content from each control unit. O to switch with
Characters are lit and displayed on the display unit of the diagnostic monitor 1 by a warning signal of an electric signal which is an N-OFF signal, and a number or a character is converted from a code signal indicating the content of a failure corresponding to the ON-OFF signal described later. It is displayed on the display unit of the diagnostic monitor 1.

The CPU 19 has a set / reset switch 2
b, when the set / reset switch 2b is in the non-operation state, the CPU 19 sends a signal to the multiplex display driving circuit 18 to keep the warning display enabled state.

The output end 20a of the serial communication interface 20 is connected to the line 14 to which the input ends 15c, 16c, 17c of the control units 15, 16, 17 are connected, and the input end 20b is connected to each of the control units 15, 16, 17, 17. Are connected to the line 13 to which the output terminals 15b, 16b, 17b of the.

The serial communication interface 20 is connected to the CPU 19, and a command signal is issued from the CPU 19 by operating the set / reset switch 2b.
0 to the control unit via line 14 via
A code signal indicating the details of the failure corresponding to the warning signal is configured to be available to the CPU 19 via the line 13, and the storage indicating the details of the failure in the control unit is cleared by operating the set / reset switch 2b again. It is configured to:

The connector 12 connected to the lines 13 and 14 is disposed at a position (not shown) in the cab. The failure diagnosis tester 11 disposed in the repair shop includes a display device, a mode changeover switch, and the like (not shown). The transmitted code signal indicating the content of the fault corresponding to the warning signal is configured to be available via the line 13, and the memory indicating the fault in the control unit is configured to be cleared.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG. If the sensor (not shown) connected to the engine control unit 15 shown in FIG. 2 fails while the set / reset switch 2b shown in FIG. 1 is in the non-operation state, a failure signal comes into the engine control unit 15 (30). 1), the content of the failure is specified in the engine control unit 15 according to the type of the sensor, and an ON-OFF signal of a pattern corresponding to the content of the failure is transmitted to the multiplex display driving circuit 18 to cause the diagnosis monitor shown in FIG. 1 displays "engine control" and lights the character (31).

When the vehicle is stored in the maintenance shop (32) and the set / reset switch 2b is operated, a failure code indicating the details of the failure can be called out numerically (33). The failure code is displayed on the diagnostic monitor 1 (34). .

The fault location is repaired, the surrounding area is inspected (35), and the set / reset switch 2b is operated again to transmit a diagnostic clear signal to the input terminal 15c of the engine control unit 15 to clear the fault ( 3
6).

In this state, it is confirmed (37) that the warning display or the failure code does not occur again, and the process is terminated. Even when the failure is not related to the engine but related to the mission or the brake, the operation is performed in the same steps as described above.

Further, in the above-described embodiment, by simply operating the set / reset switch 2b,
Although the failure code can be displayed, the switch operation method for displaying the code may be complicated so that only the maintenance worker of the maintenance shop can display the failure code, and may not be displayed to the user. In this case, it is possible to prevent the user from being easily repaired by the failure judgment of the user, and to prompt the repair by a specialized maintenance worker, so that the safety after the repair can be guaranteed.

As described in detail above, in the present embodiment, the display code as the failure code can be quickly displayed by operating the set / reset switch without reading the blinking pattern of the warning signal corresponding to the content of the failure. Since it can be easily obtained and displayed, the efficiency of repair work is improved without the need for a dedicated failure diagnosis tester.

[0024]

As described above, according to the present invention, the failure state of each control device can be displayed and cleared by a simple operation, and the efficiency of repair work can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an arrangement configuration of a diagnostic monitor and an operation switch of a failure diagnosis device for a vehicle according to an embodiment of the present invention.

FIG. 2 is a block diagram of a failure diagnosis device.

FIG. 3 is a flowchart of a failure diagnosis device.

FIG. 4 is a diagram showing a vehicle failure diagnosis device according to a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Diag monitor (multiplex display device) 2b Set / reset switch (display switching means) 18 Multiple display drive circuit 19 CPU

Claims (1)

[Claims] 1. A failure diagnosis device for a control device mounted on a vehicle, which determines an abnormality of the control device and, when an abnormality occurs, an ON-OFF signal corresponding to the content of the abnormality and an ON-OFF signal corresponding to the ON-OFF signal. A control unit that outputs a serial signal, and a multiplex display device that can display at least numerals or characters in accordance with the serial signal from the control unit in addition to a warning display related to a device corresponding to the ON-OFF signal. Display switching means capable of switching between the warning display and the number or character display corresponding to the content of the abnormality on the multiplex display device; controlling the multiplex display device by an output signal of the display switching device; Multiple display control device for displaying the numbers or characters by receiving a serial signal or displaying the warning Preparative comprising failure diagnosis apparatus for a vehicle, characterized in that the visible abnormality contents multiplexed display the information of the serial signal when an abnormality occurs in the vehicle.