JPH06344897A - Initial operation confirming device in antiskid control device - Google Patents

Abstract

PURPOSE:To surely perform the initial operation of a motor without a driver being conscious of it by starting the motor after the lapse of a prescribed time from the departure of a vehicle, and confirming whether the motor or a pump is normally operated or not. CONSTITUTION:A first auxiliary reservoir 18 rotates a motor 41 at antiskid control, drives a first pump 42, thereby supplying a brake fluid to a first liquid pressure supplying line 14 through a check valve. A second auxiliary reservoir 19 drives a second pump 43 by rotating the motor 41, and supplies the brake fluid to a second liquid pressure supplying line 15 through the check valve. The motor is ON, the rotating speed of the motor is measured, and whether the rotating speed is a prescribed value or more is examined. When it is the prescribed value or more, the normal operation of the pump or motor is judged, a motor initial check executed flag is set, the motor is OFF, and the confirming operation is terminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an initial operation confirmation device in a vehicle anti-skid control device.

[0002]

2. Description of the Related Art Conventionally, in order to confirm the initial operation of an anti-skid control device, when the vehicle speed reaches a predetermined speed (see Japanese Patent Publication No. 62-12062),
Alternatively, when it is detected that the vehicle body or the acceleration of the vehicle has reached a predetermined value (Japanese Patent Laid-Open No. 63-71468).
(See Japanese Patent Publication).

[0003]

[Problems to be Solved by the Invention] The above-mentioned conventional technique has the following problems. <B> When checking at the time when the vehicle reaches a predetermined speed, when the vehicle is started on a downhill, the vehicle accelerates while stepping on the brakes. At that time, the pump and motor start to check the operation, and the vibration is transmitted to the foot on the brake,
Further, the motor rotating sound is easily noticed by the driver, which gives anxiety and discomfort. <B> When checking at a time when the acceleration reaches a predetermined value, if the vehicle is accelerated very slowly, the operation may not be checked at any time, and the check may be delayed.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to surely perform an initial operation inspection of an anti-skid control motor without the driver being aware of it.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an initial operation confirmation device in an anti-skid control device for a vehicle, which starts a motor for driving a pump and supplies a brake fluid pressure to the brake, in a predetermined time from the start of the vehicle. After the passage of
An initial operation confirmation device in an anti-skid control device characterized by starting the motor and confirming whether the motor or the pump operates normally, and also deceleration or brake light An initial operation confirmation device in an anti-skid control device characterized by delaying the predetermined time when lighting is detected, and an anti-skid control characterized by changing the predetermined time when the acceleration is a predetermined value or more. It is in the initial operation confirmation device in the device.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. <B> Configuration of brake pressure system An example of the brake pressure system of the X pipe is shown in FIG.
When the brake petal 11 is stepped on, hydraulic pressure is generated in the master cylinder 12 for the two systems. The brake fluid is stored in the reservoir 13. A line for supplying the brake fluid pressure of two systems from the master cylinder 12 is laid. The first hydraulic pressure supply line 14 in it includes the inlet valves 21 and 2
2 are connected to the wheel cylinder 35 of the left front wheel 31 and the wheel cylinder 36 of the right rear wheel 32, respectively. In addition, the brake fluid is supplied to outlet valves 25 and 2 respectively.
6 and the first auxiliary pressure reservoir 18 via the first hydraulic pressure discharge line 16. Similarly, the other second hydraulic pressure supply line 15 is connected to the inlet valves 23 and 24 of the right front wheel 33 and the left rear wheel 34, and is hydraulically connected to the wheel cylinder 37 of the right front wheel 33 and the wheel cylinder 38 of the left rear wheel 34. Supplying pressure. Further, each outlet valve 27
And 28 and the second hydraulic pressure discharge line 17 are connected to the second auxiliary reservoir 19. First auxiliary reservoir 18
During the anti-skid control, the motor 41 is rotated and the first pump 42 is driven to supply the brake fluid to the first hydraulic pressure supply line 14 via the check valve. Similarly, the second auxiliary reservoir 19 drives the second pump 43 by rotating the motor 41 to supply the brake fluid to the second hydraulic pressure supply line 15 via the check valve.

<B> Control of Brake Pressure The inlet valves 21 to 24 are open when there is no control signal. Therefore, the brake hydraulic pressure communicates with the wheel cylinders 35 to 38 from the master cylinder 12 via the first and second hydraulic pressure supply lines. When the inlet valves 21 to 24 receive the signal, the brake fluid pressure is shut off. Also, the outlet valve 25
˜28 are closed when there is no signal, and open when receiving a signal. In the open state, hydraulic pressure communicates from the wheel cylinders 35 to 38 to the first and second auxiliary reservoirs 18 and 19. Therefore, in the case of normal brake control, when the brake pedal 11 is stepped on, hydraulic pressure is directly applied to the wheel cylinders 35 to 38 of each wheel via the inlet valves 21 to 24, and the brake pedal 11 is released. The hydraulic pressure is also reduced accordingly and the braking is adjusted. At this time, the brake lamp switch 51 mounted on the brake pedal 11 monitors the depressed state of the brake pedal and is used as brake control information such as lighting of the brake lamp.

In the case of anti-skid control, when the brake pedal 11 is strongly depressed and the tire slips, the anti-skid control operates. As shown in FIG. 2, the anti-skid control device controls the wheel speed, estimated vehicle speed, acceleration, etc. by an electronic control device 53 such as a computer based on a signal from a wheel speed sensor 52 or the like that detects the rotational speed of the wheel. To determine the slip condition. Then, the valves 21 to 28 of the inlet and the outlet are opened and closed in the hydraulic pressure control device 54, and the wheel brake 35 is opened.
Control ~ 38 to control wheel locking.
At this time, the motor 41 rotates, and the first and second pumps 42,
By 43, the brake fluid is supplied to the first and second auxiliary reservoirs 1
It supplies to the 1st-2nd hydraulic pressure supply lines 14 and 15 from 8, 19, and supplies brake pressure to the wheel cylinders 35-38 of each wheel as needed. If the motor 41 or the first
If the pump 42 and the second pump 43 are out of order, even if the anti-skid control state is entered, the auxiliary reservoirs 18, 19
If it becomes impossible to take out the liquid and the auxiliary reservoir becomes full, the pressure cannot be reduced and the wheels may be locked. Therefore, it is necessary to confirm the initial operation of the motor and the pump in advance when starting the vehicle.

<C> Flow of Motor Initial Check FIG. 3 to FIG. 4 show an example of the flow of motor initial check by the electronic control unit 53 including a computer.
First, referring to FIG. 3, an initialization routine such as a counter and flag clear in the electronic control unit 53 is executed (S1),
Then, wheel speed, wheel acceleration, and vehicle speed (Vref) are calculated (S2, S3, S4). Next, in order to check whether or not the motor initial check has already been carried out, it is checked whether or not the carried flag (for example, 1 bit of the register in the electronic control unit is assigned) is set to 1 (S5).
If the motor initial check has already been carried out, there is no need to do it again, so the process branches to step (S14). If it has not already been done, the execution flag (for example, assigning 1 bit of the register in the electronic control unit) is set to 1 in order to check whether or not the motor initial check is being performed next.
It is checked whether is standing (S6). If the in-execution flag is set to 1, the motor initial check is performed, and therefore the process branches to step S16 in which the operation of the motor initial check is confirmed.

If the running flag is not set to 1, the vehicle speed (Vre
The change in f) is examined (S7). For example, the difference ΔVre between the previous vehicle speed (Vref (n-1)) and the current vehicle speed (Vref (n))
If f is taken and the difference ΔVref is positive, it is judged that the vehicle is starting. It should be noted that the sampling time may be set long in order to reduce the influence of disturbance. If the difference ΔVref is positive, it is determined that the vehicle has started, and the value of the brake lamp switch 51 is checked to check whether or not the brake is depressed (S8). When the brake is depressed, the counter is cleared and the process proceeds to step S14 in order to delay the confirmation of the initial check operation of the motor (S15). If the vehicle is not stepped on, it is checked whether or not the acceleration ΔVref / Δt of the vehicle is a predetermined value or more (S9). The predetermined value may be 0.1 g, for example. If it is equal to or larger than the predetermined value, 2 is added to the counter in order to confirm the initial operation early (S11). If it is less than the predetermined value, 1 is added to the counter (S10). Next, in order to check whether or not a predetermined time has elapsed from the start, it is checked whether or not the value of the counter is equal to or more than the predetermined value (S12). The predetermined value is, for example, 200, and if 200 is configured to be 1 second, when the counter is incremented by 1, the predetermined time is 1 second, and when 2 is added to the counter, 0. It will be 5 seconds. If the value of the counter is not equal to or more than the predetermined value, the process waits until the predetermined time elapses, and proceeds to step S14 (S12). If it is equal to or larger than the predetermined value, 1 is set to the motor initial check in-execution flag in order to enter the step (S16) of confirming the motor initial operation. Then, in the next process, the step (S6) for confirming whether the motor initial check in-execution flag is set to 1 branches to the step (S16) for confirming the operation of the motor initial check (S13).

<D> Motor Initial Check Operation Confirmation Process A specific example of the motor initial check operation confirmation will be described with reference to FIG. In this example, the motor is equipped with a motor rotation speed sensor coaxially with the motor. First, the motor is turned on, the rotation speed of the motor is measured, and it is checked whether or not the rotation speed is equal to or higher than a predetermined value (N1, N
2). If it is equal to or more than the predetermined value, it is judged that the pump or the motor is operating normally, the motor initial check completion flag is set (N3), and the motor is turned off (N
4) The confirmation operation is completed. If it is less than the predetermined value, the motor initial check counter is incremented (N5), and it is investigated whether the value of this counter is larger than the predetermined value (N6).
When the counter value is smaller than the predetermined value, the same processing is repeated again in the next processing. this is,
This is because it takes some time for the motor to reach the steady rotation speed after turning on the motor. When the counter value becomes larger than the predetermined value, it is determined that the motor or the pump is out of order, the motor is turned off, or the alarm lamp is turned on to warn the driver (N7). Then, in order to perform normal brake control, the power supply of the control device of the anti-skid brake system (ABS) is cut off (N8). The above is an example of the case where the motor is equipped with a motor rotation speed sensor coaxially with the motor, but other methods include checking the relay terminal voltage of the motor.

[0012]

According to the present invention, the following effects can be obtained. <B> Since the initial operation check can be reliably performed within a predetermined time after the vehicle starts, it is possible to notify the driver of the abnormality early. <B> Since the initial operation is not checked when the brake pedal is depressed, uncomfortable pedal return and vibration are not transmitted to the foot. <C> When the acceleration is large, the predetermined time is shortened, and when the vehicle is accelerated from the stopped state, a relatively large acceleration is usually generated, so that the failure can be found early. <D> Since the check of the motor requiring a large current can be shifted to the traveling start stage immediately after the engine is started, the battery voltage can be prevented from decreasing.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a hydraulic system.

FIG. 2 is a schematic diagram of an anti-skid control device.

FIG. 3 is a flowchart of an initial check of a motor.

FIG. 4 is a flowchart of a motor initial check operation confirmation.

Claims (3)

[Claims] 1. An initial operation confirmation device in a vehicle anti-skid control device for starting a motor for driving a pump to supply brake fluid pressure to the brake, wherein the motor is started after a predetermined time has elapsed from the start of the vehicle. An initial operation confirmation device in an anti-skid control device, which confirms whether or not the motor or the pump operates normally. 2. The initial operation confirmation device in the anti-skid control device according to claim 1, wherein when the deceleration or the lighting of the brake light is detected within the predetermined time, the predetermined time is delayed. The initial operation confirmation device in the anti-skid control device. 3. The initial operation confirmation device in the anti-skid control device according to claim 1, wherein when the acceleration is a predetermined value or more, the predetermined time is changed. Initial operation confirmation device in the device.