Patent ID: 6776462
Filing Date: 2004-08-17
Classification: B60T

Abstract:
An anti-skid control system for an automotive vehicle, comprising:a brake unit to adjust a brake liquid pressure of a wheel cylinder installed on each road wheel of the vehicle, the brake unit being enabled to form any one of a pressure increase state, a pressure decrease state, and a pressure hold state in each wheel cylinder; a wheel velocity detecting section that detects wheel velocities of the respective road wheels; a pseudo vehicle body velocity calculating section that calculates a pseudo vehicle body velocity on the basis of the detected road wheel velocities of the respective road wheels; a road wheel deceleration calculating section that calculates a deceleration of each of the road wheels; a vehicle body deceleration calculating section that calculates a pseudo vehicle body deceleration from the calculated pseudo vehicle body velocity; and a brake control unit that, when any one of the wheel velocities of the respective road wheels has reached to a target velocity derived on the basis of the pseudo vehicle body velocity, forms the pressure decrease state of the brake unit to execute such a pressure decrease control as to carry out a decrease in pressure of the brake liquid of any one of the wheel cylinders which corresponds to one of the road wheels whose detected wheel velocity has reached to the target velocity and, thereafter, when the calculated wheel deceleration of the corresponding one of the road wheels becomes equal to or below zero, forms the pressure increase state of the brake unit to execute such a pressure increase control as to carry out an increase in pressure of the brake liquid of the corresponding one of the wheel cylinders, the brake control unit suspending the pressure increase control and executing such a pressure hold control as to hold the brake liquid pressure of the road wheel corresponding one of the wheel cylinders when the calculated wheel deceleration of the corresponding one of the road wheels has reached to a predetermined deceleration set on the basis of the vehicle body deceleration.