JP3150000B2 - 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 an anti-skid device for an automobile (hereinafter referred to as an ABS device), and more particularly to an ABS device.
The present invention relates to a method for detecting a failure in an excitation circuit or an alarm lamp circuit of a main relay of a device.

[0002]

2. Description of the Related Art Conventionally, an ABS device for a vehicle is provided in the middle of a flow path for transmitting a brake pressure in a master cylinder operated by a brake pedal to a wheel cylinder of each wheel. When approaching, the brake pressure is alternately reduced and increased to prevent the wheels from being in a skid state and to maintain a stable running property.

[0003] The ABS device is provided with a main relay that functions to turn on an alarm lamp, turn off a solenoid valve, and return to a normal braking function when an abnormality occurs in the system. Usually, the excitation circuit of the main relay is controlled by one drive circuit on the power supply side or the ground side. However, if a short circuit on the power supply side or a short circuit on the ground side occurs in the excitation circuit, the main relay remains ON, and the power cannot be cut off even if a solenoid valve system failure or a pump motor system failure occurs. There is.

[0004]

Therefore, there has been proposed an ABS apparatus in which both the power supply side and the ground side of the excitation circuit of the main relay are shut off when an abnormality occurs, and the contact of the main relay is kept in the OFF state. (Japanese Patent Laid-Open No. 63-1)
No. 59172). When the excitation circuit of the main relay is abnormal as described above, the alarm lamp will be turned on.However, in this case, the excitation circuit of the main relay has failed or other parts have failed. There is a drawback that cannot be determined. On the other hand, in the ABS system,
The circuit is made redundant so that the alarm lamp can be turned on by both the controller and the main relay. However, if the main relay and the alarm lamp are disconnected, the alarm lamp cannot be turned on by the main relay, while if the controller and the alarm lamp are disconnected, the controller will not turn on the alarm lamp. become unable. The disconnection of these circuits could not be detected by the controller unless a special circuit was set separately.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for detecting a failure in an ABS device that can easily determine and display a failure in an excitation circuit of a main relay by using the initial lighting of an alarm lamp. Another object of the present invention is to provide a failure detection method for an ABS device that can easily determine and display a failure in a warning lamp circuit without setting a special detection circuit by using the initial lighting of a warning lamp. .

[0006]

According to one aspect of the present invention, an exciting circuit for a main relay is provided.
The power supply side and ground side, respectively the power supply and the ground part of the
It is connected so that it can be turned ON and OFF, and the power supply side and the ground side of the excitation circuit are alternately turned ON for a certain period immediately after the main power switch is turned ON. Claims
According to the invention described in 2 above, one end of the alarm lamp circuit is individually connected to the anti-skid controller and the main relay, and the alarm lamp is initially turned on for a certain period immediately after the main power switch is turned on. Flashing by anti-skid controller and main relay
Flashing and anti-skid control
Lighting by the controller and lighting by the main relay alternate.
It is something that was to be done .

[0007]

Generally, in the ABS system, the alarm lamp is initially turned on for a fixed time immediately after the ignition switch is turned on in order to confirm that the alarm lamp has run out. According to the first aspect of the invention, during this initial lighting period,
By turning on the power supply side and the ground side of the excitation circuit of the main relay alternately, the alarm lamp blinks accordingly. If both the power supply side and the ground side of the excitation circuit are normal, the alarm lamp will light continuously during the initial lighting period, whereas if either the power supply side or the ground side is short-circuited, the alarm lamp will turn off. Because it flashes
The short circuit of the excitation circuit can be easily determined. If the alarm lamp is off, the lamp is not initially turned on. In the first aspect of the present invention , it is possible to determine which side is short-circuited by appropriately setting the order and the number of ON times of the power supply side and the ground side of the excitation circuit. According to the second aspect of the invention, the initial lighting of the alarm lamp is performed.
Flashing by controller and flashing by main relay
Configurable, with lighting by controller and main relay
By turning on and off alternately, if either the main relay and the alarm lamp or between the controller and the alarm lamp is broken, the alarm lamp will blink instead of lighting continuously Alternatively, the lighting period is shortened, and disconnection of the alarm lamp circuit can be easily determined. In addition,
In the invention according to claim 2, if the lighting period by the controller and the lighting period by the main relay are lit in separate patterns, the disconnection between the main relay and the warning lamp or the connection between the controller and the warning lamp may occur. This is desirable because it can be easily determined whether the wire has broken. In order to obtain these two types of lighting patterns, there are a method of changing the number of times of lighting and a method of changing the lighting time.

[0008]

FIG. 1 is a system diagram of a vehicle ABS apparatus according to the present invention. In the figure, reference numeral 1 denotes an ABS controller which controls the system and controls each unit. 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. Lights up. The battery 2, the brake switch 3, the brake lamp 4, and the wiring connecting them constitute a brake lamp circuit. The ON / OFF signal of the brake switch 3 is transmitted to the controller 1
Input of the terminal T _1. Reference numerals 5, 6, 7, and 8 denote wheel speed sensors that independently detect the wheel speeds of the four wheels, and detection signals from these sensors 5 to 8 are input to the controller 1, respectively.

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

Reference numeral 12 denotes an ignition switch which is a main power switch, and a signal of the ignition switch 12 is input to a terminal T _{4 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
Functions to turn on the alarm lamp 13 when a failure occurs in the ABS system, and to turn off solenoid valves 20 to 23 to be described later to return to a normal braking function. The alarm lamp 13 is also connected to the terminal T _{5 of the} controller 1, and the alarm lamp 13 can be turned on independently of the main relay 15 by grounding the terminal T ₅ . Power supply side coil 15b of the main relay 15 is connected to a terminal T ₆ of the controller 1, the ground side is the connection has been double lines to the terminal T _7. Then, the controller 1 makes the terminal T ₆ conductive with the terminal T ₄ ,
It can be energized coil 15b by grounding the terminal T _7. When the coil 15b is not energized, the contact 15a is grounded (OFF state), and the alarm lamp 13 is turned on.
When the coil 15b is energized, the contact 15a switches to the left side in FIG. 1 (ON state), and the alarm lamp 13 goes out.

The coil 1 of the motor relay 11 is provided between the diode 14 and the contact 15a of the main relay 15.
1b and the solenoid valves 20 to 23. The solenoid valves 20 to 23 are valves for decreasing or increasing the brake pressure. Although only four solenoid valves are shown in FIG. 1, actually two solenoid valves are provided for each wheel, for a total of eight solenoid valves. The downstream sides of the solenoid valves 20 to 23 are connected to the controller 1, respectively. Therefore, when the main relay 15 is turned off, the motor relay 1
1 and the solenoid valves 20 to 23 are also turned off, and only when the main relay 15 is turned on, the motor relay 11 and the solenoid valves 20 to 23 are also in an operable state.

As shown in FIG. 1, the coil 15b of the main relay 15 is connected to the controller 1 on both the power supply side and the ground side, so that safety measures are taken by forming a double system. However, when the power supply-side wiring 18 of the coil 15b is short-circuited to the battery 2 or the ground-side wiring 19 is short-circuited to the ground, the main relay 15 remains ON, and subsequently the solenoid valve system If a failure occurs in the pump motor system, the power cannot be cut off. Therefore, in this embodiment, the power supply side and the ground side of the excitation circuit of the main relay 15 are alternately turned ON for a certain period immediately after the ignition switch 12 is turned ON.
To detect a short circuit in the excitation circuit.

FIG. 2 shows a specific method of detecting a short circuit in the excitation circuit of the main relay 15. In the figure, when the ignition switch 12 is turned on, the alarm lamp 13 is initially turned on for a certain time (for example, about 3 seconds) in order to confirm that the alarm lamp 13 has run out. During the initial lighting period, the power supply side and the ground side of the coil 15b of the main relay 15 are alternately turned on, for example, twice. That is, the controller 1 connected to the power supply side of the coil 15b
Of the terminal T ₆ is made conductive only terminal T ₄ twice, and grounded terminal T ₇ connected to the ground side by 2 times. Each ON time may be a minute time of about 0.3 seconds, for example. If both the power supply side and the ground side of the coil 15b of the main relay 15 are not short-circuited (in a normal state), even if the power supply side and the ground side of the coil 15b are turned on alternately, the main relay 15 remains in the OFF state. Therefore, the alarm lamp 13 is continuously lit during the initial lighting period as usual. On the other hand, when the power supply side is short-circuited, the alarm lamp 13 is turned off each time the ground side of the coil 15b is turned on. On the other hand, when the ground side is short-circuited, the alarm lamp 13 is turned off every time the power supply side of the coil 15b is turned on.
Flashes only once and then lights continuously. As described above, the lighting (flashing) pattern of the alarm lamp 13 during the initial lighting period determines whether the excitation circuit of the main relay 15 is short-circuited, and if the short-circuit occurs, the power supply side or the ground side is short-circuited. You can easily determine whether you are. When it is detected that the power supply side or the ground side of the coil 15b is short-circuited as described above, the alarm lamp 13 is turned on by the controller 1 even after the initial lighting period to notify the driver or the like. You may.

FIG. 3 shows a method for detecting a disconnection failure of an alarm lamp circuit according to a second embodiment of the present invention. As shown in FIG. 1, the alarm ground side of the lamp 13 is connected to the contact 15a of the terminal T ₅ and the main relay 15 of the controller 1, the circuit to be able lit either alarm lamp 13 of the controller 1 or the main relay 15 Has been made redundant. Here, the wiring 16 between the alarm lamp 13 and the controller 1 or the alarm lamp 13 and the main relay 15
If the wire 17 is disconnected, the alarm lamp 13 cannot be turned on by the controller 1 or the main relay 15. Therefore, in this embodiment, the alarm lamp 13
The initial lighting period is a lighting period by the main relay 15,
The disconnection of the wirings 16 and 17 is detected by dividing into the lighting period by the controller 1. That is,
Immediately after the ignition switch is turned ON, the main relay 15
The lighting period by the controller 1 is provided, for example, three times, and the lighting period by the controller 1 is provided, for example, twice as a period other than the lighting period by the main relay 15. Note that both lighting periods may partially overlap. In this case, if the connection between the main relay 15 and the alarm lamp 13 is broken,
Is turned on only during the lighting period by the controller 1, so the number of blinks is two. On the other hand, if the connection between the controller 1 and the alarm lamp 13 is broken,
Is turned on only during the lighting period by the main relay 15, the number of times of blinking is three, and the broken portion can be easily determined. If there is no disconnection in any of the circuits, the alarm lamp 13 is continuously lit during the initial lighting period.

[0015]

As is apparent from the above description, claim 1
According to the invention, during the initial lighting period of the alarm lamp,
The power supply side and the ground side of the excitation circuit of the main relay are alternately turned on, so that the short-circuit of the excitation circuit of the main relay can be easily determined by turning on or off the alarm lamp, and a special detection circuit is provided. No need. According to the second aspect of the present invention, the initial lighting of the alarm lamp is performed by the controller and the main relay.
And lighting by the controller and main relay
Since the alarm lamp is turned on and off alternately, it is possible to easily determine the disconnection of the alarm lamp circuit by the lighting or blinking operation of the alarm lamp, and it is possible to determine the location of the disconnection without providing a special detection circuit .

[Brief description of the drawings]

FIG. 1 shows an ABS for implementing a failure detection method according to the present invention.
It is a circuit diagram of a device.

FIG. 2 is a diagram showing a method for detecting an excitation circuit short circuit of a main relay according to the present invention.

FIG. 3 is a diagram showing a method for detecting a disconnection of the alarm lamp circuit according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ABS controller 2 Battery 5-8 Wheel speed sensor 10 Pump motor 11 Motor relay 12 Ignition switch 13 Alarm lamp 15 Main relay 15b Coil 20-23 Solenoid valve

Claims (2)

(57) [Claims] 1. An anti-skid device which turns off a main relay and turns on an alarm lamp when an abnormality occurs in an anti-skid control system to inhibit anti-skid control . the power supply side and the ground side
Connect them to the power supply and grounding part so that they can be turned on and off
That together, the failure detection method of the anti-skid device, characterized in that the ON alternately and the power supply side and the ground side of the exciting circuit for a certain period of time immediately after the main power switch is turn ON. 2. An anti-skid device in which, when an abnormality occurs in the anti-skid control system, the main relay is turned off and an alarm lamp is turned on to prohibit the anti-skid control. while individually connected to the antiskid controller and the main relay, the alarm lamp for a certain period of time immediately after the main power switch is turned oN so as to initially lit and flashing the initial lighting by flashing and main relay by the antiskid controller
And lighting by anti-skid controller
And lighting by the main relay are performed alternately.
A method for detecting a failure of an anti-skid device.