JPH0911886A - Brake control device - Google Patents

Abstract

PURPOSE: To provide a brake control device which can perform high-degree control and can be formed as small, lightweight and simple constitution. CONSTITUTION: A brake control device is provided with a pump 3 arranged in a brake caliper 2, a cylinder 7 communicated with the pump 3 and a brake piston 4 internally installed in the cylinder 7, and is constituted so as to control brake force generated by the brake piston 4 in the cylinder 7 by controlling actuation of the pump 3.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a brake control device.

[0002]

2. Description of the Related Art Generally, a hydraulic system is mainly used as a brake mechanism used in vehicles and industrial machines.

The structure will be briefly described by taking a disc brake for a vehicle as an example. A brake caliper is provided in the vicinity of a rotating body such as a disc, and a cylinder for accommodating a piston is provided in the brake caliper. A brake pad is brought into contact with the tip of the piston, and the brake pad is pressed against the disc as the piston advances. The cylinder is connected to a brake master cylinder via a hydraulic pressure pipe, and transmits the hydraulic pressure generated in the brake master cylinder to the piston,
It is designed to activate the brake.

Regarding the vehicle brake, a device for distributing a predetermined hydraulic pressure to the four wheels and a plurality of hydraulic systems are provided in case of a hydraulic leak.

[0005]

By the way, in recent years, sophisticated control systems have been introduced into vehicle brakes.
That is, this is a system in which the brakes of the wheels are separately controlled in order to prevent wheel lock during braking and drive wheel slip during acceleration. When such a system is advanced, for example, operations such as delayed operation and high-speed repetitive operation that cannot be handled by simple hydraulic control are required, and a hydraulic control device is required in the middle of the hydraulic piping. Become.

Further, in a brake device for an industrial machine, a brake may be added or relocated,
The conventional hydraulic system requires piping work for the hydraulic pipe each time. However, the piping of the hydraulic pipe is not easy because it involves connection with other hydraulic systems. Moreover, since air bleeding is indispensable, there are cases where complicated piping cannot be used.

In addition to the hydraulic brake, there is an electric brake, for example, a motor driven by a motor and a ball screw operated via a speed reducer has been proposed. Although such an electric brake has advantages such as high-precision control, the weight and outer size increase, and it is difficult to use it instead of the current hydraulic brake.

The present invention has been made in view of the above matters, and it is an object of the present invention to provide a brake control device capable of performing advanced control corresponding to delay operation, high-speed repetitive operation, etc. Subject.

Further, it is a technical object to provide a brake control device which allows easy addition or relocation of the device.

[0010]

The present invention has the following configuration in order to solve the above technical problems. That is, in claim 1, the pump 3 provided in the brake caliper 2, the cylinder 7 communicating with the pump 3, and the brake piston 4 installed in the cylinder 7 are provided.
By controlling the operation of the pump 3, the braking force generated in the brake piston 4 in the cylinder 7 is controlled. <Brake Caliper 2> The brake caliper 2 indicates a base fixed to the rotating body 1 to be braked. For example, in a disc brake, a fixed type,
A floating type or a sliding type can be exemplified.

Further, the brake caliper 2 may be a brake mechanism including a wheel cylinder in a drum brake. Examples of the drum brake include a leading trailing type and a two leading type, and examples of the high boosting type include a duoservo type and a uniservo type.

The rotating body 1 is a concept including a shaft and the like in addition to a disc and a drum. <Pump 3> The pump 3 is for generating pressure (fluid pressure or pneumatic pressure) in the pressure medium by the operation of the pump 3. A gear type pump, a trochoid pump, a rotary pump, etc. can be illustrated as a type of pump. <Brake Piston 4, Cylinder 7> The brake piston 4 is a cylinder 7 provided in the brake caliper 2.
The interior is slidable. The pressure medium from the pump 3 is supplied to the chamber formed by the inner wall of the cylinder 7 and the brake piston 4. Further, adding a brake pad to the brake piston 4 is also optional.

In the structure of claim 2, an electric motor 10 for driving the pump 3, and the electric motor 10
An electric power control unit (ECU) 6 for supplying electric power to <Electric Motor 10> As the electric motor 10, a DC servo motor, a stepping motor, a linear motor, an ultrasonic motor, or the like is suitable. The electric motor does not necessarily have to rotate, but may be an electric device that reciprocates or vibrates. <Power Control Unit 6> The power control unit 6 supplies a predetermined power to the electric motor 10. Here, the predetermined power means current control by changing the applied voltage, control by changing the pulse duty ratio of the pulse wave, control by changing the frequency of the AC power supply, and changing the waveform. The control means control according to the electric motor 10 used for the pump 3, such as control, intermittent control by a thyristor chopper or a triac.

A storage unit in which the control contents are patterned can be added to the power control unit 6. This can be exemplified by storing the pulse duty ratio as a waveform most suitable for braking and selecting and outputting the waveform according to an actual case.

When the present device is used as a vehicle brake mechanism, the power control unit 6 includes the brake pedal sensor 25.
It is possible to control the electric motor 10 according to the operating state of the brake pedal (pedal depression force) based on the information from.

Further, in the structure of claim 3, the pump 3 and an electric motor 10 for driving the pump 3,
A reservoir 5 that communicates with the pump 3 and stores the working fluid is provided integrally with the brake caliper 2.

The present apparatus as a whole is constructed so as to have a weight and an external size that can be mounted in place of a conventional brake apparatus for a vehicle brake, for example.

[0018]

In the construction of claim 1, the brake caliper 2
The operation of the brake piston 4 in the cylinder 7 is controlled by controlling the operation of the pump 3 provided in the. That is, by controlling the pump 3, the pressure transmitted from the pump 3 to the cylinder 7 via the pressure medium is changed to control the braking force generated in the brake piston 4.

According to the second aspect of the invention, the electric power control unit 6 controls the electric motor 10 for driving the pump 3. Further, in the structure of claim 3, the pump 3 is supplied with the hydraulic fluid from the reservoir 5, and thereby operates the brake piston 4.

[0020]

Embodiments of the present invention will be described with reference to FIGS. In this embodiment, the present invention is applied to a vehicle disc brake of a floating caliper system. That is, the rotating body 1 is a ventilated disc, and the brake caliper 2 is arranged in a non-contact manner so as to surround the ventilated disc.

The brake caliper 2 is provided with a cylinder 7 in which a brake piston 4 is slidably mounted. A liquid chamber 8 is formed by the inner wall of the cylinder 7 and one surface of the brake piston 4. An annular groove is formed in the cylinder 7, and an O-ring 14 is provided in this groove.

The tip of the brake piston 4 comes into contact with a brake pad 17 slidably held by a pad support member (not shown). On the other hand, a brake pad 18 is provided on the side facing the brake pad 17.

A pump 3 is provided in the brake caliper 2. The pump 3 communicates with the liquid chamber 8 of the cylinder 7 via a liquid passage 21. The pump 3 generates a hydraulic pressure by the driving force of the electric motor 10, and a gear type pump, a trochoid pump, a rotary pump or the like can be used as a type of the pump. Moreover, as the electric motor 10, a DC servo motor, a stepping motor, a linear motor, an ultrasonic motor, or the like can be used.

The electric motor 10 rotates the shaft 1
1 and the electric motor 10 and the pump 3 are integrated by connecting this with the pump 3. The electric motor 10 is screwed to the side surface of the brake caliper 2 to enhance cooling efficiency.

A concave portion serving as a reservoir 5 is provided on the upper portion of the brake caliper 2 (the upper position in a properly mounted state), and the reservoir 5 is connected to the pump 3 via a liquid passage 23. There is. That is, the liquid chamber 8 of the cylinder 7 is connected to the reservoir 5 via the pump 3. The inside of the reservoir 5, the liquid chamber 8 and the pump 3 is filled with a working fluid 9. A lid 5a is detachably fitted in the opening of the reservoir 5.

The electric motor 10 is a power control unit (EC
U) 6. The power control unit 6 is connected to a brake pedal sensor 25 that detects the pedal effort of the brake pedal, and outputs the power reflected in the brake operation. That is, current control by changing the applied voltage, control by changing the pulse duty ratio of the pulse wave, control by changing the frequency of the AC power supply, control by changing the waveform, thyristor chopper or triac Performs control such as intermittent control.

FIG. 2 shows a control waveform by changing the pulse duty ratio of the pulse wave, and FIG. 3 shows a control waveform by voltage control. This waveform is appropriately selected and output according to the vehicle speed, the vehicle weight, the slip ratio, and the like.

Next, the operation of this embodiment will be described. First,
When a brake pedal (not shown) is pressed to apply a brake, a signal is input from the brake pedal sensor 25 to the electric power control unit 6, and the electric power control unit 6 outputs electric power according to the pedaling force of the brake pedal. . As a result, the electric motor 10 is energized to operate the electric motor 10, and the pump 3 pumps the hydraulic fluid 9 in the reservoir 5 toward the cylinder 7. The pressure liquid supplied to the liquid chamber 8 of the cylinder 7 advances the brake piston 4, and the brake pads 17 and 18 sandwich the rotating body 1 to brake the rotating body 1.

When the power supply to the electric motor 10 is stopped, the hydraulic fluid 9 in the fluid chamber 8 is transferred to the reservoir 5 via the pump 3.
And the brakes are released. As described above, the electric motor 10 and the pump 3 can generate as much hydraulic pressure as necessary at the time of braking, so that a highly efficient and compact brake control device can be obtained.

Further, the control of the brake mechanism can be performed only by electric wiring without using the pressure liquid pipe.

[0031]

According to the present invention, since the braking force is controlled by controlling the pump provided in the brake caliper, it is possible to control the braking force at a higher level than the conventional hydraulic brake. Becomes

If a power control unit connected to the electric motor for driving the pump is provided, more detailed brake control can be performed. Further, since the brake caliper itself is provided with the electric drive device, the brake can be installed simply by making electrical wiring without requiring a hydraulic fluid pipe.

Further, since the pump and the electric motor are integrally provided on the brake caliper, a highly efficient braking device can be provided in a compact and lightweight manner. In addition, when a reservoir is added, a proper amount of hydraulic fluid is always replenished, so that stable performance can be obtained for a long period of time.

[Brief description of the drawings]

FIG. 1 is an overall sectional view showing one embodiment of the present invention.

FIG. 2 is an output waveform of the power control unit according to the embodiment.

FIG. 3 is an output waveform of the power control unit according to the embodiment.

[Explanation of symbols]

 1 ・ ・ Rotator 2 ・ ・ Brake caliper 3 ・ ・ Pump 4 ・ ・ Brake piston 5 ・ ・ Reservoir 5a ・ ・ Lid 6 ・ ・ Electric power control unit (ECU) 7 ・ ・ Cylinder 8 ・ ・ Liquid chamber 9 ・ ・10 ・ ・ Electric motor 11 ・ ・ Shaft 14 ・ ・ O-ring 17 ・ ・ Brake pad 18 ・ ・ Brake pad 21 ・ ・ Liquid passage 23 ・ ・ Liquid passage 25 ・ ・ Brake pedal sensor

Claims (3)

[Claims] 1. A pump provided on a brake caliper,
A brake including a cylinder communicating with the pump and a brake piston installed in the cylinder, wherein the brake force generated by the brake piston in the cylinder is controlled by controlling the operation of the pump. Control device. 2. The brake control device according to claim 1, further comprising an electric motor that drives the pump, and an electric power control unit that supplies a predetermined electric power to the electric motor. 3. The brake caliper according to claim 1, wherein the pump, an electric motor for driving the pump, and a reservoir communicating with the pump are provided integrally with the brake caliper. The described brake control device.