Patent ID: 6193331
Filing Date: 2001-02-27
Classification: B60T

Abstract:
A brake system for vehicles comprising:first brake fluid pressure generating means having a brake fluid pressure generating source for generating a first brake fluid pressure to apply a brake force to a vehicle;first wheel brake force generating means for applying a predetermined wheel brake force to a first wheel and a second wheel in response to the first brake fluid pressure from the generating source;second wheel brake force generating means for applying a predetermined wheel brake force to a third wheel and a fourth wheel in response to the first brake fluid pressure from the generating source;a first fluid line connecting the generating source and the first wheel brake force generating means;a second fluid line connecting the generating source and the second wheel brake force generating means;vehicle longitudinal motion detecting means for detecting a longitudinal motion of a vehicle body; andpressure difference forming means having first increasing means in the first fluid line and second increasing means in the second fluid line, the first increasing means being for forming a second brake fluid pressure higher than the first brake fluid pressure to apply the second brake fluid pressure to the first wheel brake force generating means and the second increasing means being for forming a third brake fluid pressure higher than the first brake fluid pressure to apply the third brake fluid pressure to the second wheel brake force generating means, wherein:at least one of the first increasing means and the second increasing means is rendered operative to form a pressure difference between brake fluid pressures applied to the first wheel brake force generating means and to the second wheel brake force generating means in response to the detected longitudinal motion of the vehicle,the vehicle motion detecting means is for detecting a movement of load on the vehicle in a vehicle longitudinal direction during a vehicle braking operation; andthe pressure difference forming means is for forming the pressure difference between the brake pressures applied to the first wheel brake force generating means and to the second wheel brake force generating means in response to the detected movement of load.