Brake control system and method for a vehicle

Claim 1

A brake control system for use in a motor vehicle, comprising: a master cylinder generating a fluid pressure for a brake; a brake device having a wheel cylinder; a fluid passage communicating said master cylinder with said wheel cylinder; a gate valve of a normally open type provided at said fluid passage, said gate valve closing during the skid-preventing control of a wheel and the acceleration slip-preventing control of a driving wheel; a compression cylinder device provided at said fluid passage between said gate valve and said wheel cylinder, said compression cylinder device having a compression piston reciprocately disposed therein, said compression piston dividing an inside of said compression cylinder device into a fluid supply chamber communicating with said fluid passage and a rear chamber; a decompression cylinder device provided at said fluid passage between said gate valve and said wheel cylinder, said decompression cylinder device having a decompression piston disposed therein, said decompression piston dividing an inside of said decompression cylinder device into a decompression chamber and a back chamber; a close valve of a normally close type provided between said decompression chamber and said fluid passage, said close valve being opened by a wheel lock signal; an accumulator accumulating a hydraulic pressure; and a valve system provided between said accumulator and said rear and back chambers of said compression and decompression cylinder devices, said valve system selectively supplying the hydraulic pressure in said accumulator to said rear and back chambers during the skid-preventing control of the vehicle wheel and the acceleration slip-preventing control of the driving wheel.