Patent ID: 6280003
Filing Date: 2001-08-28
Classification: B60T

Abstract:
A method of determining when and on which rear wheel brakes to activate braking force distribution control in a hydraulic brake system of a vehicle, which system comprises:a hydraulic unit comprising a wheel speed sensor for detecting wheel speed, a main hydraulic circuit connecting a master cylinder to four wheel cylinders via inlet valves, and an auxiliary hydraulic circuit connecting the wheel cylinders to an auxiliary reservoir via outlet valves;a means for detecting acceleration of a vehicle movement; andan electronic control device which controls the hydraulic unit;wherein the method comprises the steps of:independently determining the speed of rear wheels of the vehicle;determining whether to apply braking force distribution control to an inner rear wheel or an outer rear wheel;if the rear wheel subject to control stands an outer rear wheel, applying braking force distribution control to the outer rear wheel when a deceleration threshold value is increased according to acceleration of a vehicle lateral direction and the absolute value of vehicle deceleration exceeds the deceleration threshold value; andif the rear wheel subject to control is an inner rear wheel, applying braking force distribution control to the inner rear wheel when a deceleration threshold value is increased according to acceleration of a vehicle lateral direction and the absolute value of vehicle deceleration exceeds the deceleration threshold value.