JPH11157434A - Diagnostic display of abs control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the working effectiveness in a failure diagnosis of an ABS(anti-lock brake system) control device by reducing the moving distance of a service operator. SOLUTION: An ABS(anti-lock brake system) control device 10 is equipped with an ECU(electronic control unit) 54 with HU(hydraulic unit) 52 incorporated, a diagnosis display 12, diagnosis connector 58, and wheel speed sensors, etc. The diagnosis display 12 is configured so that the coil 141 of a relay 14 is connected between the output terminal WL for diagnosis displaying of ECU 54 and the supply potential VIG and an alarm lamp 70 and the normally closed contact 142 of the relay 14 are connected in series between the supply potential VIG, and the grounding potential GND. The normally closed contact 142 emits, for example a clicking sound, in opening and closing. The relay 14 is positioned near the diagnosis connector 58.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in an ABS (Anti-lock Brake System) control device for applying a brake while preventing a wheel from being locked in the field of automotive engineering, and is used for displaying a failure diagnosis result and the like. Display related.

[0002]

2. Description of the Related Art FIG. 3 is a circuit diagram showing an ABS control device and a conventional diagnostic display. Hereinafter, description will be made based on this drawing.

[0003] The ABS control device 50 is an ECU (Electronic Controller) having a built-in HU (hydraulic unit) 52.
ol unit) 54, a diagnostic indicator 56, a diagnostic connector 58, a wheel speed sensor (not shown), and the like. H
U52 includes solenoids 601-603 for opening and closing valves.
A motor 62 for driving the pump, a fail-safe relay 64 for supplying power to the solenoids 601 to 603 according to a control signal from inside the ECU 54, and a motor relay 6 for supplying power to the motor 62 according to a control signal from inside the ECU 54
6 and the like.

[0004] diagnostic indicator 56 is constituted by the inverting circuit 68 and the warning lamp 70 are connected in series between the output terminal WL and the power supply potential V _IG for diagnosis display ECU 54. The inverting circuit 68 includes an npn bipolar transistor 681 and resistors 682 to 6
85. Resistors 682-685
Is for imparting predetermined on / off characteristics to the transistor 681.

The HU 52 is supplied with power from a battery 74 via a fuse 72. The diagnostic indicator 56 is supplied with electric power from a battery 74 via an ignition switch 76.

Next, the failure diagnosis function of the ABS control device 50 and the operation of the diagnostic indicator 56 will be described.

When the ignition switch 76 is turned on, the ABS control device 50 starts operating. If the ABS control device 50 is operating normally, the output terminal WL is at L level.
The (low) level, the transistor 681 is off, and the warning lamp 70 is off. Here, if any failure occurs, the output terminal WL becomes H (high) level.
The transistor 681 is turned on, which causes the warning lamp 7
0 lights up. The output terminal WL has a connector 7.
When 8 is not fitted, the power supply potential V _IG is applied to the base of the transistor 681 via the resistor 683, so that the transistor 681 is turned on, and the warning lamp 70 is also turned on. Therefore, the driver and the service operator can know the failure of the ABS control device 50 and the unfitting of the connector 78 by turning on the warning lamp 70.

[0008] However, in this state, the warning lamp 70 only keeps lighting, and the details of the failure cannot be known. Then, both ends 58d, 58 of the diagnostic connector 58
By connecting g with the short pin 80, the input terminal DNS is set to L level. Then, a pulse signal indicating a failure code is output from the output terminal WL, so that the warning lamp 70 repeats blinking corresponding to the failure code.

[0009]

FIG. 4 is a schematic diagram showing an instrument panel in front of a driver's seat, and FIG. 5 is a schematic diagram showing an engine room. Hereinafter, description will be made with reference to FIGS.

The warning lamp 70 is installed in an instrument panel 84 in front of a driver's seat 82. On the other hand, the diagnostic connector 58 is installed in the engine room 86. Therefore, the service worker confirms that the warning lamp 70 is lit in the driver's seat 82 and then turns on the engine room 8.
6, go to both ends 58d, 58g of the diagnostic connector 58.
After returning to the driver's seat 82 and confirming the blinking of the warning lamp 70, the engine room 8
I went to 6 and checked the failure. As described above, in the prior art, in the failure diagnosis of the ABS control device 50, the driver's seat 82 and the engine room 86 have to be reciprocated many times, so that there is a problem that it takes much time and effort.

[0011]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a diagnostic display of an ABS control device, which can improve workability by reducing a moving distance of a service worker in failure diagnosis of the ABS control device. It is in.

[0012]

A diagnostic indicator of an ABS control device according to the present invention has a coil of an electromagnetic relay connected between an output terminal for diagnostic display of an ECU and a power supply potential. A warning lamp and a normally closed contact of the electromagnetic relay are connected in series between the electric potential and the electric potential. The normally closed contact of an electromagnetic relay
For example, an opening / closing sound “click” is generated.

It is assumed that the power supply potential is a positive potential and the output terminal for displaying a diagnosis when the ABS control device is normal is at the L level. At this time, when the coil of the electromagnetic relay connected between the output terminal for diagnosis display and the power supply potential is energized, the normally closed contact is opened, and the warning lamp is turned off. Here, if a failure occurs and the output terminal for diagnostic display becomes H level, the coil of the electromagnetic relay is not energized, so that the normally closed contact is closed and the warning lamp is turned on. Also, even if the connector that connects the output terminal for diagnostic display and the coil of the electromagnetic relay is not fitted, the coil of the electromagnetic relay will not be energized as well, so the normally closed contact will close and the warning lamp Lights up. Therefore, the service worker can know the failure of the ABS control device or the like by turning on the warning lamp in the driver's seat.

Subsequently, the service worker goes from the driver's seat to the engine room and connects both ends of the diagnostic connector. Then, a pulse signal indicating a failure code is output from the diagnostic display output terminal, so that the normally closed contact opens and closes and a warning lamp flashes in accordance with the failure code. By hearing the opening / closing sound of the normally closed contacts at this time, the service worker can know the details of the failure without returning to the driver's seat and checking the blinking of the warning lamp.

When the electromagnetic relay is installed near the diagnostic connector, the service worker can hear the normally-closed contact opening / closing sound at the position where both ends of the diagnostic connector are connected.

[0016]

FIG. 1 is a circuit diagram showing one embodiment of an ABS control device and a diagnostic display according to the present invention. FIG. 2 is a schematic diagram of an engine room showing a part of the diagnostic indicator of FIG. Hereinafter, a description will be given based on FIGS. 1, 2 and 4. However, the same parts as those in FIG. 3 and FIG.

The ABS control device 10 includes an ECU 54 having a built-in HU 52, a diagnostic indicator 12, and a diagnostic connector 5.
8, a wheel speed sensor (not shown) and the like are provided. Diagnosis display device 12, the coil 141 of the electromagnetic relay 14 is connected between the output terminal WL and the power supply potential V _IG for diagnosis display ECU 54, a power supply potential V _IG and warning lamp 70 between the ground potential GND Normally closed contact 142 of electromagnetic relay 14
Are connected in series. Normally closed contact 142
Generates an opening / closing sound, for example, “click” in accordance with the opening / closing operation. The ground potential GND is the body of the vehicle. In addition, the electromagnetic relay 14 is installed near the diagnostic connector 58.

Next, the failure diagnosis function of the ABS control device 10 and the operation of the diagnostic indicator 12 will be described.

When the ignition switch 76 is turned on, the ABS control device 10 starts operating. When the ABS control device 10 is operating normally, the output terminal WL is at the L level. At this time, when the coil 141 connected between the output terminal WL and the power supply potential V _IG is energized, the normally closed contact 142 is opened, so that the warning lamp 70 is turned off. If the output terminal WL goes high due to some failure, the coil 141 is not energized, so that the normally closed contact 142 is closed and the warning lamp 7 is turned off.
0 lights up. Further, even if the connector 78 connecting the output terminal WL and the coil 141 is not fitted, the coil 141 is not energized in the same manner.
Is closed and the warning lamp 70 is turned on. Therefore,
The service worker can know the failure of the ABS control device 10 by turning on the warning lamp 70 in the driver's seat 82.

Subsequently, the service worker goes from the driver's seat 82 to the engine room 86 and connects both ends 58 d and 58 g of the diagnostic connector 58 with the short pins 80. Then, a pulse signal indicating a failure code is output from the output terminal WL.
2 opens and closes, and the warning lamp 70 flashes. By listening to the opening / closing sound of the normally closed contact 142 corresponding to the failure code, the service operator can know the details of the failure without returning to the driver's seat 82 and checking the blinking of the warning lamp 70. The open / close sound of the normally closed contact 142 corresponding to the failure code may be, for example, “click, tick, tick, tick,.
・ ・ 」.

Since the electromagnetic relay 14 is installed near the diagnostic connector 58, the service worker can
At the position where both ends 58d and 58g of the diagnostic connector 58 are connected, the open / close sound of the normally closed contact 142 can be heard at the loudest volume.

The above embodiment is, of course, merely an example and does not limit the present invention. For example,
The installation location of the electromagnetic relay is not limited to the vicinity of the diagnostic connector, but may be any location as long as at least the opening and closing sound can be heard in the engine room.

[0023]

According to the diagnostic indicator of the present invention, the coil of the electromagnetic relay is connected between the diagnostic display output terminal of the ECU and the power supply potential, and is connected between the power supply potential and the ground potential. The alarm lamp and the normally closed contact of the electromagnetic relay are connected in series, so when a pulse signal indicating a failure code is output from the output terminal for diagnostic display, the normally closed contact corresponding to the failure code Opening and closing sounds can be generated. Therefore, the service operator can hear the opening and closing sounds of the normally closed contacts to know the details of the failure without returning to the driver's seat and checking the blinking of the warning lamp. Therefore, the moving distance of the service worker can be reduced, and the workability in the failure diagnosis of the ABS control device can be improved.

According to the diagnostic display of the second aspect,
Since the electromagnetic relay is installed in the vicinity of the diagnostic connector, the service operator can hear the opening and closing sound of the normally closed contact at a position where both ends of the diagnostic connector are connected.
Therefore, the moving distance of the service worker can be further reduced, thereby improving the workability in the failure diagnosis of the ABS control device.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of an ABS control device and a diagnostic indicator according to the present invention.

FIG. 2 is a schematic view of an engine room showing a part of the diagnostic indicator of FIG. 1;

FIG. 3 is a circuit diagram showing an ABS control device and a conventional diagnostic indicator.

FIG. 4 is a schematic view showing an instrument panel on the front of a driver's seat.

FIG. 5 is a schematic diagram showing an engine room.

[Explanation of symbols]

Reference Signs List 10 ABS control device 12 Diag indicator 14 Electromagnetic relay 54 ECU 58 Diag connector 70 Warning lamp 82 Driver's seat 86 Engine room 141 Coil of electromagnetic relay 142 Normally closed contact of electromagnetic relay GND Ground potential V _IG power potential WL Output for diagnostic display Terminal

Claims (2)

[Claims] An electromagnetic relay coil is connected between an output terminal for displaying a diagnosis of an ECU and a power supply potential, and a warning lamp and a normally closed contact of the electromagnetic relay are connected between the power supply potential and a ground potential. A diagnostic indicator for an ABS control device, which is connected in series. 2. The diagnostic indicator of an ABS control device according to claim 1, wherein said electromagnetic relay is installed near said diagnostic connector.