Patent ID: 6357840
Filing Date: 2002-03-19
Classification: B60T

Abstract:
An anti-lock brake system for a vehicle having at least one rear wheel brake connected to a master cylinder, the anti-lock brake system comprising:an isolation valve connected between the master cylinder and a controlled rear wheel brake; a dump valve connected to said controlled rear wheel brake; a speed sensor for monitoring the speed of a rear wheel associated with said controlled rear wheel brake; a controller electrically coupled to said isolation and dump valves and said speed sensor; said controller being operative upon detecting a potential lock-up condition of the controlled rear wheel brake, to selectively operate said isolation and dump valves to correct said potential rear wheel lock-up, said controller being further operative, after detecting a potential transition from a low mu road surface to a high mu road surface following said correction, to hold said isolation valve closed and selectively open said dump valve and while monitoring the rear wheel speed to determine whether the vehicle has actually transitioned from said low mu road surface to said high mu road surface.