Patent ID: 6193327
Filing Date: 2001-02-27
Classification: B60T

Abstract:
An anti-lock brake system for a vehicle having at least one wheel brake connected to a master cylinder, the anti-lock brake system comprising:an isolation valve connected between the master cylinder and the controlled wheel brake;a dump valve connected to the wheel brake;a speed sensor for monitoring the speed of a wheel associated with the controlled wheel brake;a controller electrically coupled to said isolation and dump valves and said speed sensor, said controller being operative, following detection of an over-speed condition of said wheel associated with the controlled wheel brake and an actuation of the controlled wheel brake which causes a deceleration of said wheel which is indicative of a potential lock-up condition of said wheel, to selectively open said dump valve and monitor the deceleration of said wheel associated with said controlled wheel brake, said controller being further operative, upon detection of a predetermined deceleration value, to monitor the speed of said wheel associated with said controlled wheel brake for a predetermined time period, said controller then being operative, following said predetermined time period to calculate a change in the speed of said controlled wheel over said predetermined time period and to compare said change in wheel speed to a predetermined wheel speed change threshold to determine if a spin-and-brake condition exists at said wheel.