JP2000127952A - Liquid pressure source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exhaust air in an accumulator without providing a special negative pressure supply source. SOLUTION: In a liquid pressure source device provided with a gear pump 36 supplying liquid pressure and an accumulator 38 which accumulates liquid pressure supplied from the gear pump 36 and supplies it to a liquid pressure brake circuit, negative pressure is generated by rotating the gear pump 36 reversely and air in the accumulator 38 is exhausted by this negative pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic pressure source device having an accumulator for accumulating a hydraulic pressure supplied by a pump, and more particularly to bleeding air from an accumulator.

[0002]

2. Description of the Related Art Conventionally, there has been a hydraulic pressure source device which stores a high pressure in an accumulator using a piston pump (Japanese Patent Laid-Open No. Hei 6 (1994) -609).
171493). That is, in this hydraulic pressure source device, the hydraulic pressure to be supplied to the hydraulic brake circuit is stored in the accumulator using the piston pump.

[0003]

In such a hydraulic pressure source device, when air remaining in the accumulator moves to a device operated by the hydraulic pressure of the hydraulic pressure source, the operation of this device is stopped. Since the intended operation may not be achieved, it is necessary to remove air remaining in the accumulator. Therefore, in the above-described hydraulic pressure source device, it is necessary to provide a separate negative pressure supply source for extracting air from the actuator.

An object of the present invention is to make it possible to bleed air from an accumulator without providing a special negative pressure supply source.

[0005]

According to a first aspect of the present invention, there is provided a hydraulic pressure source device comprising: a gear pump for supplying a hydraulic pressure; and an accumulator for accumulating the hydraulic pressure supplied by the gear pump and supplying the accumulated hydraulic pressure to a hydraulic brake circuit. In the hydraulic pressure source device, a negative pressure is generated by reversely rotating the gear pump,
The air is released from the accumulator by the negative pressure.

According to the hydraulic pressure source device of the first aspect,
Negative pressure is generated by rotating the gear pump in reverse,
With this negative pressure, the inside of the accumulator is made negative. Thus, the air trapped in the accumulator can be discharged out of the accumulator. Therefore, air can be removed from the accumulator without using a special negative pressure source.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a hydraulic brake circuit diagram of an electronic control brake device 10 to which the hydraulic pressure source device of the present invention is applied. The electronic control brake device 10 has a master cylinder 14 that pumps hydraulic oil in response to a driver's depressing operation of a brake pedal 12.

A stroke simulator 18 is connected to the master cylinder 14 through a normally open type simulator cut valve 16.
Is connected. A master pressure sensor 24 for detecting the pressure in the master cylinder 14 is provided between the master cylinder 14 and the normally closed master cut valves 20 and 22.
26 are provided.

[0009] One end of a hydraulic supply conduit 30 and one end of a hydraulic discharge conduit 32 are connected to the reservoir 28. A gear pump 36 driven by a motor 34 and capable of normal and reverse rotation is provided in the middle of the hydraulic pressure supply conduit 30, and an accumulator 38 for storing a hydraulic pressure boosted by rotating the gear pump 36 forward is provided. An accumulator pressure sensor 40 for detecting the internal pressure of the accumulator 38 and a pressure switch 42 are provided in the middle of the hydraulic pressure supply conduit 30. Further, a relief valve 44 is provided between the hydraulic supply conduit 30 and the hydraulic discharge conduit 32 for returning hydraulic oil to the reservoir 28 when the pressure in the hydraulic supply conduit 30 increases.

The other end of the hydraulic supply conduit 30 is connected to the left front wheel cylinder 48 via a hydraulic supply conduit 46FL for the left front wheel.
FL and a hydraulic cylinder 46FR for the front right wheel via a hydraulic supply conduit 46FR for the front right wheel. The other end of the hydraulic supply conduit 30 is connected to a left rear wheel wheel cylinder 48RL via a left rear wheel hydraulic supply conduit 46RL, and is connected to a right rear wheel via a right rear wheel hydraulic supply conduit 46RR. It is connected to the cylinder 48RR.

Similarly, the other end of the hydraulic discharge conduit 32 is connected to a left front wheel wheel cylinder 48FL via a left front wheel hydraulic discharge conduit 50FL, and is connected to a right front wheel wheel cylinder via a right front wheel hydraulic discharge conduit 50FR. Connected to 48FR. The other end of the hydraulic discharge conduit 32 is connected to a wheel cylinder 48RL of the left rear wheel via a hydraulic discharge conduit 50RL for the left rear wheel.
And is connected to a wheel cylinder 48RR of the right rear wheel via a hydraulic discharge conduit 50RR for the right rear wheel.

Hydraulic supply conduits 46FL, 46FR, 46RL, 4
In the middle of 6RR, the electromagnetic flow control valve (holding valve) 52
FL, 52FR, 52RL, 52RR are provided, and electromagnetic flow control valves (pressure reducing valves) 54FL, 54FR, 54R are provided in the middle of the hydraulic discharge conduits 50FL, 50FR, 50RL, 50RR, respectively.
L and 54RR are provided. Further, pressure sensors 56FL, 56F are used to detect respective pressures in the wheel cylinders 48FL, 48FR, 48RL, and 48RR.
R, 56RL and 56RR are provided. Further, a normally closed electromagnetic flow control valve 58 is provided between the wheel cylinders 48FL and 48FR.
A normally closed electromagnetic flow control valve 60 is provided between 8RL and 48RR.

An ECU (not shown) has a master cylinder 14 output by master pressure sensors 24 and 26.
A signal indicating the internal pressure, a signal indicating the pressure in the accumulator 38 output by the accumulator pressure sensor 40, and a signal indicating the pressure in the wheel cylinders 48FL to 48RR output from the pressure sensors 56FL to 56RR are input. On the other hand, the simulator cut valve 16, the master cut valves 20, 22, the electromagnetic flow control valves 52FL to 52RR, 54FL
Control signals are output to the motors 34 to 54RR, 58, 60.

In the electronic control brake device 10, during normal control, when the brake pedal 12 is operated, the pressure in the master cylinder
4 and 26, the master pressure sensors 24 and 2
The target control amount is calculated based on the pressure in the master cylinder 14 detected by 6. The braking force applied to each wheel is controlled by controlling the pressure (operating oil pressure) in the wheel cylinders 48FL to 48RR based on the target control amount.

Further, in the electronic control brake device 10, when filling the hydraulic brake circuit with hydraulic oil, the air remaining in the accumulator 38 is extracted by using the gear pump 36. That is, first, the inside of the accumulator 38 is set to a negative pressure by rotating the gear pump 36 in the reverse direction. Thereby, air appears on the upstream side of the gear pump 36. Thereafter, one or more electromagnetic flow control valves (holding valves) 52
FL, 52FR, 52RL, 52RR and the electromagnetic flow control valves (pressure reducing valves) 54FL, 54FR, 54RL, 54RR are opened, and the gear pump 36 is further rotated in the reverse direction.
Is sent to the reservoir 28. next,
Electromagnetic flow control valve (holding valve) 52FL, 52FR, 52RL, 5
2RR and electromagnetic flow control valve (reducing valve) 54FL, 54FR, 5
By closing the 4RL and 54RR and rotating the gear pump 36 forward, the pressure in the accumulator 38 is increased, and the air remaining in the accumulator 38 is dissolved in the working oil.
By repeating this process several times, the accumulator 3
The air remaining in the inside 8 can be removed.

According to this embodiment, a special negative pressure supply is performed because the gear pump 36, which increases the pressure in the accumulator 38 by rotating forward during normal control, rotates in reverse to extract air from the accumulator 38. It is possible to bleed the accumulator 38 without providing a source. Therefore, it is possible to prevent deterioration of the oil pressure followability due to the air remaining in the accumulator 38 moving to the wheel cylinders 48FL to 48RR, and deterioration of the pedal feeling due to the air moving to the master cylinder 14. Can be prevented.

In the above-described embodiment, the case where the present invention is used for the hydraulic brake device has been described. However, the present invention is not limited to this, and various devices such as a hydraulic power steering device may be used for the hydraulic pressure source device Can be used.

[0018]

According to the present invention, the pressure inside the accumulator is made negative by rotating the gear pump in the reverse direction, and the air trapped in the accumulator can be discharged out of the accumulator. Therefore, air can be removed from the accumulator without using a special negative pressure source.

[Brief description of the drawings]

FIG. 1 is a hydraulic brake circuit diagram of an electronic control brake device according to an embodiment of the present invention.

[Explanation of symbols]

10: electronic control brake device, 12: brake pedal,
14: Master cylinder, 16: Simulator cut valve,
18: Stroke simulator, 20, 22: Master cut valve, 24, 26: Master pressure sensor, 28: Reservoir, 30: Hydraulic supply conduit, 32: Hydraulic discharge conduit, 34 ...
Motor, 36: gear pump, 38: accumulator, 4
8FL-48RR: Wheel cylinder, 52FL-52RR, 5
4FL-54RR: Electromagnetic flow control valve.

Claims (1)

[Claims] 1. A hydraulic pressure source device comprising: a gear pump for supplying a hydraulic pressure; and an accumulator for accumulating a hydraulic pressure supplied by the gear pump and supplying the accumulator to a hydraulic brake circuit. A hydraulic pressure source device, wherein a pressure is generated, and the accumulator is evacuated by the negative pressure.