Patent ID: 6578932
Filing Date: 2003-06-17
Classification: B60T,Y10S

Abstract:
A hydraulic brake apparatus for a vehicle comprising:a brake operating member; a master cylinder including a master piston which is movable in a forward direction in response to a depressing operation of the brake operating member for pressurizing brake fluid in a reservoir and outputting a master cylinder hydraulic pressure to a wheel brake cylinder mounted on a vehicle wheel in response to movement of the master piston in the forward direction; an auxiliary hydraulic pressure source which pressurizes the brake fluid in the reservoir to a first predetermined pressure level and outputs a power hydraulic pressure; regulating means connected with the auxiliary hydraulic pressure source and the reservoir for regulating the power hydraulic pressure outputted from the auxiliary hydraulic pressure source to a second predetermined pressure level, for driving the master piston with the regulated power hydraulic pressure, and for terminating regulation of the power hydraulic pressure when the regulated hydraulic pressure becomes equal to a reaction force of the master cylinder relative to the master piston; hydraulic pressure detecting means for detecting the master cylinder hydraulic pressure; and control means for comparing a master cylinder hydraulic pressure detected by the hydraulic pressure detecting means with a predetermined pressure value, for implementing operation of the auxiliary hydraulic pressure source when depressing operation of the brake operating member is judged in a stage where the master cylinder hydraulic pressure detected by the hydraulic pressure detecting means is above the predetermined pressure value, and for terminating the operation of the auxiliary hydraulic pressure source when the master cylinder hydraulic pressure detected by the hydraulic pressure detecting means is stabilized at a substantially fixed pressure value after being increased.