JPH06239221A - Liquid pressure supply device - Google Patents

Abstract

PURPOSE:To maintain the liquid pressure in a liquid accumulating means at a value close to the normal value by detecting a liquid pressure booster to be in the liquid consuming condition by means of a detecting means, so as to electrically output the pressure to a control device. CONSTITUTION:A power pressure sensor 30 always monitors the power liquid pressure in a liquid pressure booster 20 and electrically outputs a signal to a control unit 40. A pressure sensor 31 and a pressure switch 32 are arranged on the communicating passage between an accumulator 10 and the liquid pressure booster 20, and the pressure sensor 31 monitors the brake liquid pressure in the accumulator 10 so as to electrically output a signal to the control unit 40. The control unit 40 controls a motor 11 based on the output signal, and hence brake liquid of decided liquid pressure is always accumulated in the accumulator 10. The pressure switch 32 detects abnormal drop of the liquid pressure in the accumulator 10 so as to output an alarm signal, and further a master cylinder 22 is connected to the liquid pressure booster 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic pressure for supplying a brake fluid of a predetermined pressure to a hydraulic pressure booster or the like which is arranged in a wheel brake hydraulic pressure circuit of an automobile and outputs a brake hydraulic pressure from a pedal effort. Regarding the feeding device.

[0002]

2. Description of the Related Art Conventionally, as a technique of this kind, Japanese Unexamined Patent Publication No.
There is one disclosed in 237851. This monitors the brake fluid pressure in an accumulator which stores brake fluid of a predetermined pressure inside by a pressure switch. When the brake fluid pressure in the accumulator drops to a predetermined pressure, this pressure switch closes the electrical contacts inside, and the control device that senses this closes the motor to drive the fluid pump. Brake fluid is discharged into the accumulator to increase the brake fluid pressure in the accumulator.

[0003]

However, in the above-mentioned conventional technique, the brake fluid pressure in the accumulator cannot be detected due to some abnormality of the pressure monitoring device, and for example, the brake fluid pressure in the accumulator has a normal value or an abnormal value. In either case, if the pressure monitoring device continues to output a signal that the pressure is below a predetermined value, the motor can be driven without stopping,
It is conceivable that the motor will be burned. In addition, to prevent the motor from burning out, the motor is designed to be continuously energized,
It is conceivable to dispose a bimetal switch or the like to stop the current from flowing to the motor when the motor reaches a predetermined temperature.
However, each of these is not suitable because of problems such as a large motor and a large increase in cost. On the other hand, regardless of whether the brake fluid pressure in the accumulator is a normal value or an abnormal value, if the pressure monitoring device continues to output a signal indicating that the brake fluid pressure is a normal value, the brake fluid pressure in the accumulator will be below a predetermined value. Even in the case of an abnormal value, the motor is not driven and a predetermined hydraulic pressure is no longer supplied to the hydraulic booster, which may prevent the hydraulic booster from fulfilling its satisfactory function.

According to the present invention, even if the pressure monitoring device is unable to perform its normal function due to some abnormality, the hydraulic pressure booster can supply the hydraulic pressure sufficient to fulfill its function. The provision of supply means is a technical issue.

[0005]

[Constitution of the invention]

[0006]

In order to solve the above-mentioned technical problem, the technical means taken in the invention of claim 1 is that the liquid having a constant pressure is constantly accumulated inside the hydraulic booster. The liquid accumulating means for supplying the liquid, the liquid supplying means for supplying the liquid to the liquid accumulating means, the pressure monitoring device for detecting that the liquid pressure in the liquid accumulating means has dropped to a predetermined pressure, and the output of the pressure monitoring device. In a hydraulic pressure supply means including a control device that controls the drive of the liquid supply means based on a signal, a detection means that detects that the hydraulic pressure booster is in a liquid consumption state and electrically outputs it to the control device. It was equipped with.

The technical means taken in the second aspect of the present invention are a liquid accumulating means for supplying a liquid having a constant pressure to the hydraulic pressure booster and a liquid accumulating means for supplying a liquid having a constant pressure to the hydraulic booster. An operating member for operating the drive, a liquid supply means for supplying a liquid to the liquid accumulating means, a pressure monitoring device for detecting that the liquid pressure in the liquid accumulating means has dropped to a predetermined pressure,
In a hydraulic pressure supply means provided with a control device for controlling the drive of the liquid supply means based on the output signal of the pressure monitoring device,
It is provided with an operation switch for opening and closing the electric contact by operating the operation member.

[0008]

The operation of the invention of claim 1 will be described. Even if the pressure monitoring device fails, the liquid in the liquid accumulating means is consumed by providing the detecting means for detecting that the hydraulic booster has consumed the liquid and electrically outputting it to the control device. Since it can be detected that the liquid pressure in the liquid accumulating means can be maintained at a value close to a normal value.

The operation of the invention of claim 2 will be described. Even if the pressure monitoring device fails, it is possible to detect that the liquid consuming device is consuming liquid by providing an operation switch that has an electric contact inside and opens and closes the electric contact when the operating member is operated. Therefore, the liquid pressure in the liquid accumulating unit can be maintained at a value close to the normal value.

[0010]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a wheel brake hydraulic circuit diagram of an automobile showing a first embodiment according to the invention of claim 1. In FIG. In the figure, the chain line shows the flow of electricity and the solid line shows the flow of fluid.
The accumulator 10 is a brake fluid tank 1 pumped by a fluid pump 12 driven by a motor 11.
The brake fluid in 3 is supplied through the check valve 14 and is stored and supplied to the hydraulic booster 20.
Reference numeral 0 is for assisting the pedaling force applied to the brake pedal 21 to generate brake hydraulic pressure in the master cylinder 22, and further, a power pressure sensor 30 is provided, and the power pressure sensor 30 is a hydraulic booster. The power hydraulic pressure in 20 is constantly monitored and electrically output to the control unit 40. A pressure sensor 31 and a pressure switch 32 are arranged in the flow passage between the accumulator 10 and the hydraulic booster 20, and the pressure sensor 31 monitors and controls the brake hydraulic pressure in the accumulator 10. The pressure is output electrically to the unit 40, and the control unit 40 controls the motor 1 based on the output signal of the pressure sensor 31.
By controlling the drive of No. 1, the accumulator 10 can always store the brake fluid of a predetermined hydraulic pressure. Further, the pressure switch 32 detects that the hydraulic pressure of the accumulator 10 is abnormally lowered and issues a warning signal. Further, a master cylinder 22 is directly connected to the hydraulic booster 20, and a brake hydraulic pressure corresponding to the assisting force from the hydraulic booster 20 is output from the master cylinder 22 to the wheel cylinder 23. Wheel cylinder 2
3 receives a brake fluid pressure output from the master cylinder 22 and drives a brake device (not shown) to generate a braking force.

In the first embodiment, the hydraulic booster 2
The power pressure sensor 30 for monitoring the power hydraulic pressure in 0 is used, but it is not particularly limited to this, and there is no problem even if a master cylinder pressure sensor for monitoring the brake hydraulic pressure in the master cylinder 22 is used. There is no.

FIG. 2 shows a second embodiment according to the invention of claim 2 and is a wheel brake hydraulic pressure circuit diagram of an automobile. Only differences from the first embodiment will be described. In the figure, a pedal switch 33 is provided which opens and closes an internal electrical contact (not shown) when the brake pedal 21 is depressed. The control unit 40 detects the contact state of the pedal switch 33 to drive the motor 11. Is controlled.

The brake pedal 21 is the accumulator 10.
The output signal from the pressure sensor 31 does not change even if the amount of brake fluid accumulated at the normal pressure of the accumulator 10 is changed by an amount corresponding to the consumption.
When the pressure switch 31 indicates that the hydraulic pressure in the accumulator 10 is abnormally low, even though the brake hydraulic pressure in the internal pressure is output within the normal range, the control unit 40 determines that the pressure is low. When a failure of the sensor 31 or the pressure switch 32 is detected, the drive control of the motor 11 is performed by the output signal from the power pressure sensor 30 in the first embodiment. Further, in the second embodiment, the drive control of the motor is performed according to the contact state of the pedal switch 33.

As described above, since the drive control of the motor 11 can be performed by the signals from the power pressure sensor 30 and the pedal switch 33 in addition to the pressure sensor 31 or the pressure switch 32, the pressure sensor 31 or the pressure switch 3 is used.
Even if some abnormality occurs in 2 and does not operate normally, the hydraulic booster 20 operates normally even if the brake fluid pressure in the accumulator 10 is not as great as when it is in a completely normal state. Liquid pressure can be secured.

Further, in the second embodiment, since the pedal switch 33 that is normally mounted is used, there is no need to manufacture a new device, and the cost is low.

[0017]

The effect of the invention of claim 1 will be described. Liquid accumulating means for supplying a constant pressure liquid to the hydraulic booster so that the liquid having a constant pressure is constantly accumulated therein; liquid supplying means for supplying the liquid to the liquid accumulating means; In a hydraulic pressure supply device including a pressure monitoring device that detects a decrease in pressure and a control device that controls the drive of the liquid supply device based on the output signal of the pressure monitoring device, the hydraulic booster consumes liquid. A hydraulic pressure supply device characterized by comprising a detection means for electrically detecting to the control device and electrically outputting to the control device, wherein the hydraulic booster device is provided even if the pressure monitoring device fails. Since the consumption of the liquid in the liquid accumulating unit can be detected by providing the detecting unit for detecting the consumption of the liquid and electrically outputting the liquid to the control device, the liquid in the liquid accumulating unit can be detected. Pressure close to normal It is possible to keep to.

The effect of the invention of claim 2 will be described. A liquid accumulating means for supplying a constant pressure liquid to the hydraulic booster, the liquid accumulating means for operating the drive of the hydraulic booster, and a liquid accumulating means for supplying the liquid to the hydraulic accumulator. A liquid supply means, a pressure monitoring device that detects that the liquid pressure of the liquid storage means has dropped to a predetermined pressure, and a control device that controls the drive of the liquid supply means based on the output signal of the pressure monitoring device. A hydraulic pressure supply device comprising an operation switch for opening and closing an electrical contact by operating an operating member, wherein the hydraulic pressure supply device has an internal electrical contact even if the pressure monitoring device fails. The operating switch that opens and closes the electrical contact when the operating member is operated makes it possible to detect that the hydraulic booster is consuming liquid, so that the hydraulic pressure in the liquid accumulating means is brought to a normal value. Close to One it becomes possible.

Further, in both claims 1 and 2,
Even if the liquid cannot be stored in the liquid storage means, the liquid can be supplied to the hydraulic booster based on the signal of the detection means or the operation switch, so that the hydraulic booster has a satisfactory function. There is no stopping it.

[Brief description of drawings]

FIG. 1 is a brake hydraulic circuit diagram of an automobile showing a first embodiment according to the invention of claim 1.

FIG. 2 is a brake hydraulic circuit diagram of an automobile showing a second embodiment according to the invention of claim 2;

[Explanation of Codes] 10 ... Accumulator 11 ... Motor 20 ... Hydraulic Booster 22 ... Master Cylinder 30 ... Power Pressure Sensor 31 ... Pressure Sensor 32 ... Pressure Switch 33 ... Pedal switch 40 ... Control unit

Claims (2)

[Claims] 1. A liquid accumulating means for constantly accumulating a liquid having a constant pressure inside to supply the liquid having a constant pressure to a hydraulic booster, and a liquid supplying means for supplying a liquid to the liquid accumulating means.
Liquid pressure including a pressure monitoring device that detects that the liquid pressure of the liquid accumulating means has dropped to a predetermined pressure, and a control device that controls the drive of the liquid supplying means based on an output signal of the pressure monitoring device. The supply means is provided with a detection means for detecting that the hydraulic booster is in a liquid consumption state and electrically outputting to the control device. 2. A liquid accumulating means for supplying a liquid having a constant pressure to the hydraulic pressure booster, the liquid accumulating means for operating the drive of the hydraulic pressure booster, and the liquid. Liquid supply means for supplying the liquid to the storage means, a pressure monitoring device for detecting that the liquid pressure of the liquid storage means has dropped to a predetermined pressure, and the liquid supply means for the liquid supply means based on an output signal of the pressure monitoring device. A hydraulic pressure supply device including a control device that controls driving, wherein the hydraulic pressure supply device includes an operation switch that opens and closes the electrical contact by operating the operation member.