Patent ID: 6371576
Filing Date: 2002-04-16
Classification: B60T

Abstract:
A method of controlling a vehicle hydraulic brake system comprising a brake operating member, a master cylinder for producing hydraulic pressure corresponding to a brake operating force applied to said brake operating member, a wheel cylinder, a hydraulic pressure source for producing brake hydraulic pressure in said wheel cylinder, a driving device for said hydraulic pressure source, a fluid passage for bringing said hydraulic pressure source into communication with said wheel cylinder, a fluid replenish passage for bringing said master cylinder and said wheel cylinder into communication with each other, an on-off valve and a check valve provided in said fluid replenish passage, said check valve preventing a reverse flow from said wheel cylinder toward said master cylinder, a brake operating force detecting means for detecting said brake operating force, a brake hydraulic pressure detecting means for detecting the brake hydraulic pressure in said wheel cylinder, and a master cylinder hydraulic pressure detecting means for detecting the hydraulic pressure in said master cylinder, said driving device for said hydraulic pressure source and said on-off valve in said fluid replenish passage being actuated based on signals from said brake operating force detecting means, said brake hydraulic pressure detecting means and said master cylinder hydraulic pressure detecting means, wherein when said brake operating force detecting means detects a predetermined brake operating force, said on-off valve in said fluid replenish passage is opened and said driving device for said hydraulic pressure source is actuated at full driving force, and upon detection of the fact that the difference between the master cylinder hydraulic pressure and the brake hydraulic pressure, which are detected by said master cylinder hydraulic pressure detecting means and said brake hydraulic pressure detecting means, respectively, has entered a predetermined range, said on-off valve in said fluid replenish passage is closed and said driving device for said hydraulic pressure source is actuated at a driving force corresponding to the difference between the master cylinder hydraulic pressure and the brake hydraulic pressure.