JP3276251B2 - Anti-skid device failure detection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a failure of an anti-skid device for an automobile (hereinafter referred to as an ABS device), and more particularly to a method for appropriately reading a failure code of the ABS device.

[0002]

2. Description of the Related Art An ABS device for a vehicle is provided with a solenoid valve in a passage for transmitting brake pressure in a master cylinder operated by a brake pedal to a wheel cylinder of each wheel, and the wheels are brought into a skid state by rapid braking. When approaching, the brake pressure is alternately reduced and increased by the solenoid valve to prevent the wheels from being in a skid state and to maintain a stable running property.

The ABS apparatus has an anti-skid controller (hereinafter simply referred to as a controller) having a self-diagnosis function capable of detecting any abnormality in the system. When a failure is detected, the main relay and the motor relay are turned off to prohibit the anti-skid control, turn on the alarm lamp, and return to the normal brake function.

[0004]

In the conventional ABS system, when an abnormality of the system is detected, the controller returns to the normal brake state as described above and transmits the contents of the failure to the worker in the repair shop. The corresponding failure code is stored. When the failure code reading mode is activated, the failure code is displayed by blinking the alarm lamp. One end of the alarm lamp is individually connected to the controller and main relay,
The lighting circuit has a dual system so that it can be individually lit by a controller or a main relay. Therefore, in the failure code reading mode, the main relay is turned off.
N, it is necessary to blink the alarm lamp only by the controller.

However, when the main relay has an open failure (for example, disconnection of the excitation circuit, the contact of the main relay is always OFF), or when the excitation circuit of the main relay has a short-circuit power failure, the output of the main relay is output. Even if it is turned on, the main relay remains off, and the alarm lamp stays on. Therefore, even if the failure code reading mode is activated, the alarm lamp cannot be blinked, and the failure code cannot be displayed. When the solenoid circuit causes a body short-circuit failure, the main relay can be turned on. However, it is better not to turn on the solenoid because the solenoid is continuously energized and the solenoid is protected. Therefore, when the main relay output is turned off in the failure code reading mode, the alarm lamp is always lit and the failure code cannot be displayed. Further, in the case where the main relay is determined to be a short-circuit failure, particularly when the circuit upstream of the main circuit of the main relay is broken, the main relay is turned off by the controller so that the alarm lamp is always lit. Stipulated. Therefore, also in this case, the failure code cannot be displayed.

[0006] In order to solve such a problem, it is proposed to provide an opening / closing means for electrically opening the alarm lamp and the main relay when the system is abnormal and enabling the alarm code to flash the failure code. (5-6)
No. 2376). As the opening / closing means, a connector, a switch, a relay, or the like is used. By opening the opening / closing means, the alarm lamp can be turned off, and the failure code can be read. However, in this case, a separate opening / closing means must be provided between the alarm lamp and the main relay, so that there are disadvantages that the number of circuit components increases and the cost increases.

[0007] Therefore, an object of the present invention is to provide no special opening / closing means between the alarm lamp and the main relay.
An object of the present invention is to provide a method for detecting a failure of an ABS device, which can easily turn off a warning lamp and enable a failure code blinking operation of the warning lamp.

[0008]

According to the fault detecting method of the present invention, when a fault occurs in an anti-skid control system, a controller stores a corresponding fault code and turns off a main relay to inhibit the anti-skid control. In the ABS device which returns to the normal brake function and turns on the alarm lamp, one end of the alarm lamp is individually connected to a controller and a main relay, and the alarm lamp is connected between the alarm lamp and the main relay. ,
A connector for detachably mounting a diode for preventing reverse current from the main relay to the alarm lamp is provided.When the alarm lamp is normally lit in the failure code reading mode, the diode is disconnected from the connector to blink the alarm lamp failure code. It was made possible.

[0009]

In the state where the diode is connected, if the excitation circuit of the main relay is disconnected or the power supply is short-circuited, the alarm lamp cannot be turned off, and the alarm lamp cannot perform the fault code blinking operation. In such a case, by removing the diode from the connector, an electrical connection is established between the alarm lamp and the main relay, so that the alarm lamp can be freely blinked by the controller. Thereby, the failure code can be read freely. After the reading of the fault code is completed, the diode can be easily restored by reconnecting the diode to the connector.

[0010]

FIG. 1 is a system diagram of a vehicle ABS apparatus according to the present invention. In the figure, reference numeral 1 denotes a controller composed of a microcomputer or the like, which controls each part of the system and diagnoses a failure. Reference numeral 2 denotes an on-vehicle battery, 3 denotes a brake switch that is turned on in response to operation of a brake pedal, and 4 denotes a brake lamp that notifies an operation state of the brake pedal. When the brake pedal is depressed, the brake switch 3 is turned on and the brake lamp 4 is turned on. Lights up. ON / OFF signal of the brake switch 3 is input to the T ₁ terminal of the controller 1. 5,6,7,
Reference numeral 8 denotes a wheel speed sensor that independently detects the wheel speeds of the four wheels, and detection signals from these sensors 5 to 8 are input to the controller 1.

Reference numeral 10 denotes a pump motor, which drives a pump for pumping the brake fluid of the reservoir to the dynamic pressure side. The normally open contact 11 a of the motor relay 11 is connected in series with the pump motor 10, and the signal of the pump motor 10 is input to the T ₂ terminal of the controller 1. The coil 11b of the motor relay 11 is controlled by T ₃ terminal of the controller 1. The G terminal of the controller 1 is connected to the vehicle body and is always grounded.

[0012] 12 is an ignition switch which is the main power switch, the signal of the ignition switch 12 is inputted to the T ₄ terminal of the controller 1. The ignition switch 12 is connected in series with the alarm lamp 13, and further via a diode 14.
5 are connected in series to the contact 15a. Main relay 15
When a failure occurs in the ABS system, the alarm lamp 13 is turned on, and at the same time, the solenoid valve 20 described later is turned off to return to the normal braking function. The downstream side of the alarm lamp 13 is also connected to a W terminal for lamp control of the controller 1, and the W terminal is turned ON (G
By making internal conduction with the terminal), the alarm lamp 13 can be turned on independently of the main relay 15.
The coil 15b of the main relay 15
Controlled by terminal. When the coil 15b is not energized, the contact 15a is grounded (OFF), and the alarm lamp 13 is turned on. When the coil 15b is energized, the contact 15a
Is turned on, and the alarm lamp 13 is turned off.

The diode 14 is connected to a circuit via a connector 21.
1 is detachable. Therefore, the diode 14
Is removed from the connector 21, the alarm lamp 1
3 and the main relay 15 can be electrically opened. The contact 15 between the diode 14 and the main relay 15
The connection between a and a is connected to the coil 11b of the motor relay 11, the solenoid valve 20, and the monitoring M terminal of the controller 1.

The solenoid valve 20 is a valve for reducing or increasing the brake pressure.
A total of eight pieces are provided for each piece. Each solenoid valve 2
0 downstream circuits 23 are each connected to the V terminal of the controller 1. Therefore, the main relay 15
F, the motor relay 11 and the solenoid valve 2
0 is also turned off, and the voltage of the M terminal also becomes L level. When the main relay 15 is turned ON, the motor relay 11 and the solenoid valve 20 are in an operable state for the first time, and the voltage of the M terminal becomes the H level.

In the ABS system having the above structure, when any failure is detected, this failure code is stored in a memory in the controller 1, and the ignition switch 12
Even after turning off, the failure code is stored by the backup of the battery 2 input to the B terminal of the controller 1. When a failure code reading mode is activated at a repair shop or the like, if a normal failure occurs, the main relay 15
Is turned on, and the W terminal of the controller 1 is turned on / off, so that the alarm lamp 13 blinks and a failure code can be displayed. As a method of activating the reading mode, the worker connects the D terminal for reading the code connected to the controller 1 to the grounding unit using a connector or the like, and then turns on the ignition switch 12, thereby setting the activation state. Become.

However, if the main relay 15 causes an open failure (for example, disconnection of the excitation circuit 22 or the contact 15a of the main relay 15 remains OFF) or the excitation circuit 22 of the main relay 15 causes a power short-circuit failure, The main relay 15 cannot be turned ON, and the alarm lamp 13 remains ON (lit). Therefore, even if the failure code reading mode is activated, the alarm lamp 13 cannot be blinked, and the failure code cannot be displayed. When the solenoid circuit 23 causes a body short-circuit failure, the main relay 15 can be turned ON.
It is better not to turn on the main relay 15 for circuit protection. Therefore, if the main relay output is turned off in the failure code reading mode, the alarm lamp 13 cannot blink. Further, a short-circuit failure of the main relay 15 (particularly, disconnection of the main circuit upstream circuit 17 of the main relay 15).
In the case where the error occurs, it is predetermined that the main relay 15 is turned off by the controller 1 and the alarm lamp 13 is always lit, so that the failure code cannot be displayed in this case as well.

Therefore, in the present invention, after activating the failure code reading mode, the main relay 15 is turned off and the diode 14 is detached from the connector 21.
As a result, the alarm lamp 13 can be controlled to blink by the W terminal of the controller 1, and the failure code stored in the controller 1 can be easily read. After reading out the fault code, it can be restored by inserting the diode 14 into the connector 21 again.

FIG. 2 is a flowchart of an example of a method for detecting a failure during the initial lighting period of the alarm lamp 13. First, the ignition switch 12 is turned on (step S ₁ ), the R terminal is turned off, and the main relay 15 is turned off.
(Step S _2). At this time, if the circuit is normal,
The warning lamp 13 will be turned on initially. Next, the voltage of the M terminal is monitored (step S ₃ ). If the voltage of the M terminal is at the H level, it is determined that the main relay 15 is short-circuited, and the corresponding failure code is stored (step S _4). ). Then, while stopping the ABS control,
The alarm lamp 13 is continuously lit (step S _5).

Meanwhile, in step S _3, if the voltage of the M terminals is at the L level, turning ON the main relay 15 is turned ON the R terminal (Step S _6), to monitor the voltage of the M terminal (Step S ₇ ). If the voltage of the M terminal is at the L level, it is determined that the open failure of the contact circuit of the main relay 15 or the short-circuit failure of the power supply of the main relay excitation circuit 22 is stored, the corresponding failure code is stored (step S ₈ ), and the ABS control is performed. Is stopped and the alarm lamp 13
The is continuously lit (step S _5).

Further, in step S _7, when the voltage of the M terminal is at the H level, the controller 1 test pulse output to the solenoid valve 20 from the V terminal O
FF (step S _9), monitoring the output voltage of the V terminal (Step S _10). If the output voltage of the V terminal is at the H level, it is determined that the output is normal, and if the output voltage is at the L level, it is determined that the solenoid circuit 23 is short-circuited to the ground side.
Storing a fault code corresponding (step S _11). Then, the stops the ABS control, is continuously lit on the alarm lamp 13 (Step S _5). The above failure detection
This can be performed not only during the initial lighting period of the alarm lamp 13 but also during traveling and during a code reading mode described later.

FIG. 3 shows a method of reading a fault code stored in the controller 1. When reading the fault code, first, the D terminal of the controller 1 is grounded (step S
₁₄ ) Then, the read mode is started by turning on the ignition switch 12 (step S15).

When the read mode is activated, the controller 1 determines the fault code stored in the memory and determines whether it is a normal fault or another fault (open fault of main relay, short fault of main relay, short circuit of main relay excitation circuit). power short-circuit failure, determines whether the body short circuit failure) of the solenoid circuit (step S _16). If it is a normal failure, turn on the R terminal and turn off the main relay 15
N (step S ₁₇ ), the alarm lamp 13
Flashes and sequentially displays a fault code (Step S _18).

In the case of other failures, the R terminal cannot be turned on or it is not desirable to turn it on.
The terminal and OFF (step S _19). Meanwhile, since the alarm lamp 13 are continuously lit, the operator who viewed this by removing the diode 14 from the connector 21 (step S _20), flashes first warning lamp 13, so that it can display the fault codes Become.

Note that even when the short-circuit failure of the main relay is determined, the circuit 17 upstream of the main circuit of the main relay 15
Since the alarm lamp 13 is continuously lit only when the power supply is disconnected, the failure code can be displayed by removing the diode 14 from the connector 21. However, in other short failure determinations, the main relay 15 is turned off even if the main relay output is turned off. Keeps ON, the failure code can be displayed without removing the diode 14 as in the case of the normal failure.

[0025]

As is apparent from the above description, according to the present invention, a connector is provided between the alarm lamp and the main relay so that a diode for preventing reverse current from the main relay to the alarm lamp is detachable. By disconnecting the diode from the connector, the alarm code of the alarm lamp can be turned on and off, so that there is no need to separately provide an opening / closing means as in the conventional case, and the existing circuit can be used as it is, so that the configuration can be made inexpensively. . Further, since the diode is removed only when the alarm lamp is in normal operation in the failure code reading mode, the circuit is not opened unnecessarily.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an ABS device for implementing the present invention.

FIG. 2 is a flowchart illustrating an example of a failure detection method according to the present invention.

FIG. 3 is a flowchart illustrating a method of reading a fault code according to the present invention.

[Explanation of symbols]

 1 Controller 12 Ignition Switch 13 Alarm Lamp 14 Diode 15 Main Relay 21 Connector 22 Excitation Circuit 23 Solenoid Circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60T 8/88 B60T 8/96 B60T 17/22

Claims (1)

(57) [Claims] When a failure occurs in an anti-skid control system, the anti-skid controller stores a corresponding failure code, turns off a main relay to inhibit the anti-skid control, returns to a normal brake function, and issues an alarm. In an anti-skid device that lights a lamp, one end of the alarm lamp is individually connected to an anti-skid controller and a main relay, and between the alarm lamp and the main relay, the main relay changes to an alarm lamp. A connector for detachably mounting a diode that prevents reverse current of the alarm lamp is provided, and when the alarm lamp is in normal operation in the failure code reading mode, the diode is disconnected from the connector to enable the alarm lamp to blink the failure code. Detection method for anti-skid device