Patent ID: 6496769
Filing Date: 2002-12-17
Classification: B60T

Abstract:
A brake control for a vehicle having mechanically coupled front wheels and rear wheels equipped with pressure activated brakes, comprising:at least one front brake pressure modulator for cyclically releasing a front pressure supplied to the front wheel brakes in response to a detected slipping of the front wheels and then increasing said front pressure at a controlled rate during a front apply interval until front wheel slipping is detected again; at least one rear brake pressure modulator for cyclically releasing a rear pressure supplied to the rear wheel brakes in response to a detected slipping of the rear wheels and then increasing said rear pressure at a controlled rate during a rear apply interval until rear wheel slipping is detected again; means responsive to the cyclic releasing and increasing of said front and rear pressures for determining a relative measure of apply interval as between said front and rear modulators; means effective when the relative measure reaches a front-to-rear torque transfer threshold for detecting that the front wheels are decelerating the rear wheels through the mechanical coupling, and for increasing the release of said front pressure if a slip speed of said front wheels exceeds a calibrated value; and means effective when the relative measure reaches a rear-to-front torque transfer threshold for detecting that the rear wheels are decelerating the front wheels through the mechanical coupling, and for increasing the release of said rear pressure if a slip speed of said rear wheels exceeds said calibrated value.