JP2574944Y2 - Vehicle braking control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vehicle brake control device, and more particularly to a device for preventing an automatic vehicle from running in an idling state.

[Conventional technology]

In general, an automatic vehicle employs a torque converter, so that when a gear is engaged, the vehicle runs even in an idling state. This phenomenon is called creep, which can be dangerous because the car can move forward without the driver's awareness.

Conventionally, in order to avoid such danger beforehand, there is a device in which the hydraulic pressure in a wheel cylinder is held by a solenoid valve to prevent creep start. When the vehicle starts, the solenoid valve is released simply by depressing the accelerator, and the wheel cylinder pressure becomes a steady pressure. As described above, there is a device described in Japanese Patent Application Laid-Open No. 59-137246 that automatically releases the brake at the time of starting.
In this system, the depression of the accelerator pedal is detected by a sensor, and the electromagnetic valve is released by this signal to enable the vehicle to start.

[Problems to be solved by the invention]

However, in the above-described conventional device, even if the accelerator is depressed to the extent that the foot is touched by mistake, the accelerator is sensed and the brake is released, so that there is a possibility that the vehicle may start at an unexpected time. .

The present invention has been made in view of the above circumstances, and it is a technical object of the present invention to provide a vehicle brake control device that releases a brake only when there is a continuous depression of an accelerator with an intention to start. Make it an issue.

[Means for solving the problem]

In order to solve the above-mentioned technical problem, the present invention is a device that holds a fluid pressure in a wheel cylinder by an electromagnetic valve to prevent a creep start, wherein an accelerator pedal is depressed by an accelerator pedal. Has a sensor that detects the
The vehicle brake control device that controls the opening and closing of the electromagnetic valve by the output signal from the electromagnetic valve control circuit has the following configuration.

That is, the braking control device starts slowly opening the solenoid valve when the accelerator depression signal is input from the sensor,
When the accelerator depression signal continues for a predetermined time,
A detection unit is provided for completely releasing the solenoid valve and stopping the release of the solenoid valve when the accelerator pedal depression signal does not continue for a predetermined time and controlling the solenoid valve to be again closed.

[Action]

The detection unit gradually releases the solenoid valve simultaneously with the depression of the accelerator, but when the depression is stopped within a predetermined time, the release of the solenoid valve is stopped and the state is controlled again to the closed state. On the other hand, when the accelerator depression signal continues for a predetermined time, the electromagnetic valve is completely released, and the vehicle can be started.

Thus, the brake is completely released only when there is a continuous depression of the accelerator with the intention to start. In addition, since the gentle release is started simultaneously with the depression of the accelerator, quick start is possible without delay in operation.

Further, since the release start of the solenoid valve is slowly opened, a sufficient brake pressure can be left when the solenoid valve is closed again in the case of an erroneous accelerator operation.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS.

This device is mounted on a vehicle with a torque converter.

The solenoid valve 1 is located between the master cylinder 7 and the wheel cylinder 2 and is a solenoid valve control circuit 5 for preventing creep starting.
The opening and closing are performed by. That is,
In the closed state, the brake is applied by containing the hydraulic pressure in the wheel cylinder 2 to prevent the vehicle from moving forward unnecessarily. The solenoid valve control circuit 5 is connected to a vehicle speed sensor 8, which detects creep and automatically performs the above operation.

A sensor 4 for detecting that the accelerator pedal 3 is depressed is attached to the accelerator pedal 3, and this sensor 4 is turned on even when the accelerator pedal 3 is lightly depressed. The output of the sensor 4 is connected to a detection unit 6 in the braking control device 5. When the accelerator pedal depression signal from the detection unit 6 is the sensor 4 continues T for more than _one second (T ₂ seconds), the solenoid valve 1 is completely released, the electromagnetic when the duration of the accelerator depression signal is less than T1 seconds The release of the valve 1 is stopped and the closed state is controlled again. That is, the third
In the figure, assuming that the depression duration of the accelerator is T seconds, when T1> T, the release of the solenoid valve 1 is stopped halfway, and when T1 ≦ T, the solenoid valve 1 is completely released.

The electromagnetic valve 1 is controlled by a thyristor chopper S1, and gradual on / off control is possible by changing the duty ratio. The timing setting and the control of the duty ratio are performed by a microcomputer (not shown), and the detection unit 6 is realized by software having the following functions.

 An operation example will be described with reference to FIG. 2 and FIG.

Starting in step 30, it is determined in step 31 whether or not the accelerator is depressed. Here the positive branch Y
Shifts to step 32, where the release of the solenoid valve 1 is gradually started (slow opening). On the other hand, the negative branch N in step 31 enters an input waiting loop for determining whether or not the accelerator is depressed. Step 32 proceeds to step 33, and step
At 33, it is determined whether or not the accelerator is continuously depressed for a time exceeding T1. Here, the positive branch Y proceeds to step 34, and the negative branch N proceeds to step 35.

In step 34, the solenoid valve 1 is continuously released, and
It is completely released at 37. On the other hand, in step 35, the gentle opening is stopped, and the solenoid valve 1 is controlled to the closed state again.

This is shown in a timing chart, which shows that the solenoid valve 1 is closed again when the accelerator pedal is depressed at T1, and is completely released at T2.

As described above, when the accelerator depression signal from the sensor continues for a predetermined time, the solenoid valve 1 is completely released, and when the accelerator depression signal does not continue for a predetermined time, the release of the electromagnetic valve is stopped and the valve is closed again. Since the control is performed, the operation is smoother and the ride comfort is excellent compared to a case where the depression time of the accelerator is simply measured and the solenoid valve 1 is rapidly released when the predetermined time is continued. I have.

In addition, since the gentle release is started at the same time as the accelerator is depressed, it is possible to start quickly without delay.

[Effect of the invention]

According to the present invention, when the accelerator depression signal from the sensor continues for a predetermined time, the solenoid valve is completely released,
When the accelerator depression signal does not continue for a predetermined period of time, the release of the solenoid valve is stopped and the closed state is controlled again.Therefore, the brake is not released when the accelerator is touched to the extent that the accelerator is accidentally touched. The brake is completely released only when the accelerator is depressed. Therefore, there is no possibility that the vehicle suddenly starts to move, and the safety can be improved.

In addition, the solenoid valve starts opening slowly as soon as the accelerator is depressed, so that it can start quickly without delay in operation, and when the solenoid valve is re-closed in the event of an incorrect accelerator operation,
Since the opening is gradual, a sufficient brake pressure remains, and both the smoothness of starting and the safety of maintaining the stop can be taken.

[Brief description of the drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a block diagram, FIG. 2 is a flowchart, FIG. 3 is a timing chart, and FIG. It is a timing chart which shows operation | movement. 1 ... solenoid valve, 2 ... wheel cylinder, 3 ... accelerator pedal, 4 ... sensor, 5 ... solenoid valve control circuit, 6 ...
Detection unit.

Claims (1)

(57) [Scope of request for utility model registration] An apparatus for holding a hydraulic pressure in a wheel cylinder by an electromagnetic valve to prevent creep starting, comprising: a sensor for detecting that an accelerator pedal is depressed by an accelerator pedal; An output signal of the sensor is input to an electromagnetic valve control circuit, and a brake control device for a vehicle that controls opening and closing of the electromagnetic valve according to an output signal from the electromagnetic valve control circuit, wherein the brake control device includes an accelerator depression signal from the sensor Is input, the slow opening of the solenoid valve is started, the solenoid valve is completely released when the accelerator depression signal continues for a predetermined time, and the release of the solenoid valve is stopped when the accelerator depression signal does not continue for a predetermined time. A vehicle braking control device, comprising: a detection unit for controlling the vehicle to close again.