Brake control system for a motor vehicle

Claim 1

A brake control system for use in a motor vehicle having a driving wheel and a driven wheel, 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 provided at said fluid passage, said gate valve closing during the lock-preventing and the acceleration slip-preventing controls when said brake is operated; a compression cylinder device provided at said fluid passage between said gate valve and said wheel cylinder of said brake device, said compression cylinder device having a compression piston reciprocably disposed therein, said compression piston dividing an inner place of said compression cylinder device into a fluid supply chamber communicating with said fluid passage and a rear chamber; means provided inside said compression cylinder device for closing the fluid passage between said fluid supply chamber and said wheel cylinder of said brake device for said driven wheel in accordance with the movement of said compression piston toward said fluid supply chamber side; an accumulator accumulating a brake fluid pressure; and a valve system provided between said accumulator, a reservoir and said rear chamber of said compression cylinder device, said valve system selectively supplying the brake fluid pressure in said accumulator to said rear chamber and exhausting said brake fluid pressure in said rear chamber to said reservoir during the acceleration slip-preventing control of said driving wheel.