JP2757862B2 - Brake control 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 controlling a brake used for braking a vehicle, and more particularly to a technique for effectively utilizing the performance of a brake in an emergency.

[0002]

2. Description of the Related Art In the above-mentioned brake control method, generally, a brake of a vehicle is controlled based on an operation of a brake operation member. Conventionally, in this brake control method, the brake is controlled so that the brake can be operated with the same strength regardless of whether it is emergency or normal.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a brake control method capable of effectively utilizing the performance of a brake in an emergency.

[0004]

Means for Solving the Problems] The gist of the present invention, the brake control method, operation of the brake operating member
While detecting the speed, the detected operation speed
If it exceeds, regardless of the subsequent operation speed,
When the operating force of the
That is, the brake is controlled to be larger than the case . In one embodiment of the present invention, the detected
After the operating speed exceeds the reference value, the braking force is
Brakes to increase to the maximum
Is controlled.

[0005]

In the brake control method according to the present invention, when the operating speed of the brake operating member does not exceed the reference value, it is determined that normal braking is being performed and the brake is operated based on a normal rule. If the operation speed of the brake operation member exceeds the reference value, it is determined that emergency braking has occurred, and the brake operation is performed independently of the subsequent operation speed.
When the operating force of the
The brake is controlled to be larger than the case.

[0006]

Therefore, according to the present invention, it is possible to obtain an effect that , in the normal braking, as in the conventional brake control method, appropriate braking is performed, and in the event of an emergency braking, stronger braking is performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a system diagram showing a hydraulic brake device for implementing the brake control method according to the present embodiment . In the figure, reference numerals 80 and 82 denote front wheel cylinders for operating left and right front wheel brakes, and 84 and 86 denote rear wheel cylinders for operating left and right rear wheel brakes. The wheel cylinders 80, 82, 84, 86 are provided with a hydraulic pressure generated in the master cylinder 92 based on the depression of a brake pedal 90 as a brake operating member and the depression of the brake pedal 90 by switching the change valve 88. Accumulator 9 controlled by electromagnetic hydraulic pressure control valve 94
The higher one of the hydraulic pressures 6 is alternatively supplied. trout
The pedaling force of the brake pedal 90 is applied to the
The vacuum booster 96a as a key booster
It is boosted and transmitted. Reference numeral 97 denotes a proportioning valve. The proportioning valve 97 is a master
The hydraulic pressure of the cylinder 92 is reduced to reduce the rear wheel cylinder 8
4,86.

The depression force of the brake pedal 90 is detected by a depression force sensor 98 and supplied to a controller 100. The controller 100 calculates the excitation current to the electromagnetic pressure control valve 94 on the basis the depression force of the brake pedal 90, the vehicle body acceleration supplied from the acceleration sensor 102, its
Is supplied to the electromagnetic amplifier control valve 94 by the operation amplifier 104. Thereby, the wheel cylinders 80, 8
The hydraulic pressures of 2, 84 and 86 are controlled to a height at which a deceleration corresponding to the depression force of the brake pedal 90 is obtained. The controller 100 is provided near the base end of the brake pedal 90 .
Encoder 105 for detecting its rotational speed.
Is also connected. The encoder 105 is a brake pedal
One pulse signal is generated each time the nozzle 90 rotates by a certain minute angle.
It is supplied to the controller 100. In the accumulator 96, the brake fluid pumped from the reservoir 106 by the pump 108 is always stored in a constant hydraulic pressure range. 110 is a motor for driving the pump 108 . In the present hydraulic brake device, the hydraulic pressure controlled by the electromagnetic hydraulic pressure control valve 94 is normally supplied to the wheel cylinders 80, 82, 84, 86, but an abnormality occurs on the electromagnetic hydraulic pressure control valve 94 side. The master cylinder 9
2 is supplied with the generated hydraulic pressure, so that the braking force is ensured. The control pressure of the electromagnetic hydraulic pressure control valve 94 is set to be slightly higher than the hydraulic pressure of the master cylinder 92.

The electromagnetic hydraulic pressure control valve 94 is a spool type electromagnetic hydraulic pressure control valve, and applies a brake hydraulic pressure (corresponding to the brake operating force) having a height proportional to the exciting current to the wheel cylinders 80, 82, 84, 86. The spool is driven in one direction by a force proportional to the hydraulic pressure of the control pressure port connected to the wheel cylinders 80, 82, 84, 86, while the control force of the force motor generated in a magnitude proportional to the exciting current. Is applied in the opposite direction, and the spool is stopped at a position where both are balanced, whereby the hydraulic pressure control is performed.

[0010] The program represented by the flowchart of FIG. 2 is stored in the ROM of the computer constituting the main body of the controller 100.

In S21, the output signal of the pedaling force sensor 98 is read, and the pedaling force of the brake pedal 90 is detected. In S22, the operation speed of the brake pedal 90 is detected by counting the pulse signal output from the encoder 105. Then, in S23,
It is determined whether or not the operation speed of the brake pedal 90 is higher than the reference value. If the result of the determination is NO, it is determined that normal braking is being performed, and normal brake fluid pressure control is performed in S24. That is, the brake fluid pressure is controlled to a height at which a deceleration of a magnitude corresponding to the depression force of the brake pedal 90 is obtained. On the other hand, if the determination result in S23 is YES, that is, if the operation speed of the brake pedal 90 is higher than the reference value, control is performed to rapidly increase the brake fluid pressure to a predetermined maximum brake fluid pressure. As a result, during an emergency brake, the maximum brake fluid pressure is increased irrespective of the operation speed and the depression force of the brake pedal 90 and the front wheel cylinders 80, 82.
Is supplied to the rear wheel cylinders 84, 86 at a height whose maximum hydraulic pressure is reduced by the proportioning valve 97, so that the maximum braking force (corresponding to the brake operating force) in all the brakes is provided. ) Is generated and the braking distance of the vehicle is significantly reduced.

In the above embodiment , the rotation speed of the brake pedal 90 as the brake operating member is determined by the encoder.
Although the brake operation speed is detected by the detection by the 105 , the brake operation speed is detected by detecting the axial moving speed of the push rod that transmits the depression force of the brake pedal to the brake booster or the master cylinder. It is also possible to detect the operation speed. Further, the hydraulic pressure of the master cylinder 92 and the like can be detected by a hydraulic pressure sensor, and the operating speed of the brake operating member can be detected based on the magnitude of the pressure increase gradient. Further, in the above-described embodiment, the brake fluid pressure is controlled in two stages according to the two stages of the brake operation speed. However, the operation speed of the brake operation member is increased in multiple stages. It is also possible to separately perform different brake fluid pressure controls for each stage. In addition, the present invention can be implemented in various modified and improved forms based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 shows a brake control method according to an embodiment of the present invention .
FIG. 2 is a system diagram showing a hydraulic brake device to be implemented.

FIG. 2 shows a computer for implementing the brake control method .
Float showing the control program executed by the computer
It is a chart.

[Explanation of symbols]

 80, 82 Front wheel cylinder 84, 86 Rear wheel cylinder 90 Brake pedal 92 Master cylinder 94 Electromagnetic fluid pressure control valve 96 Accumulator 100 Controller 105 Encoder

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60T 7/12-8/96 B60T 13/66

Claims (2)

(57) [Claims] 1. A method for controlling a brake of a vehicle based on an operation of a brake operation member , comprising detecting an operation speed of the brake operation member,
If the detected operation speed exceeds the reference value,
Regardless of the operating speed, the operating force of the brake
A brake control method comprising: controlling a brake so that a speed is higher than a normal case where a speed does not exceed a reference value . 2. When the detected operation speed exceeds a reference value.
In this case, the operating force of the brake
The brake is controlled to increase to a large value according to claim 1.
On-board brake control method.