Patent ID: 6663191
Filing Date: 2003-12-16
Classification: B60T

Abstract:
A hydraulic brake apparatus for a vehicle comprising:a brake operating member; a master cylinder including a master piston which is moved forward in response to a depressing operation of the brake operating member to pressurize brake fluid in a reservoir and output a master cylinder hydraulic pressure to wheel brake cylinders mounted on vehicle wheels in response to the forward movement of the master piston; an auxiliary hydraulic pressure source for pressurizing the brake fluid in the reservoir to a predetermined pressure level and for outputting a power hydraulic pressure; master piston driving means for driving the master piston with the power hydraulic pressure outputted from the auxiliary hydraulic pressure source; a linear solenoid valve unit for controlling the power hydraulic pressure supplied to the master piston driving means from the auxiliary hydraulic pressure source and for controlling a driving force applied to the master piston; a hydraulic pressure control valve device disposed between the master cylinder and the wheel brake cylinders for controlling the master cylinder hydraulic pressure supplied to the wheel brake cylinders; a pressure sensor for detecting the master cylinder hydraulic pressure; control means for controlling the linear solenoid valve unit and the hydraulic pressure control valve device; the control means including comparing means for comparing the master cylinder hydraulic pressure detected by the pressure sensor with a predetermined reference hydraulic pressure when the linear solenoid valve unit is electrically excited when communication between the master cylinder and the wheel brake cylinders is interrupted by the hydraulic pressure control valve device while a vehicle engine is activated and the brake operating member is not operated, and correcting means for correcting an electric current actually supplied to the linear solenoid valve unit in response to a result of the comparison performed by the comparing means.