Patent ID: 6120112
Filing Date: 2000-09-19
Classification: B60T

Abstract:
A brake pressure control device for a vehicle that includes a brake pedal comprising:a first wheel brake for applying a brake force to a first wheel;a reservoir for storing brake fluid under atmospheric pressure;a master cylinder receiving brake fluid from the reservoir for generating fluid pressure in proportion to a brake pedal operation force;an accumulator for storing fluid pressure which is higher than the fluid pressure generated by the master cylinder;a fluid pump for discharging fluid pressure which is higher than the fluid pressure in the accumulator;a first fluid conduit connecting the master cylinder to the first wheel brake;a second fluid conduit connecting the fluid pump to the first wheel brake;a third fluid conduit connecting a discharge port of the fluid pump to the accumulator;a fourth fluid conduit connecting the accumulator to a suction port of the fluid pump;a fifth fluid conduit for connecting the first wheel brake to the reservoir;a first valve for opening and closing the first fluid conduit;a second valve for opening and closing the second fluid conduit;a third valve in the form of an electromagnetic valve for opening and closing the third fluid conduit;a fourth valve for opening and closing the fourth fluid conduit;a fifth valve for opening and closing the fifth fluid conduit;a relief valve regulating a maximum value of the fluid pressure discharged from the fluid pump;a brake pedal operation force detecting means for detecting an operation force of the brake pedal;a deceleration detecting means for detecting vehicle deceleration; anda controller for estimating a target deceleration of the vehicle based on the brake pedal operation force detected by the brake pedal operation force detecting means, for controlling the first valve, the second valve, the fourth valve, the fifth valve and the fluid pump to supply fluid pressure to the wheel brake so that the vehicle deceleration detected by the deceleration detecting means agrees with the target deceleration of the vehicle estimated by the controller, and for controlling at least the third valve and the fluid pump to supply fluid pressure to the accumulator.