Patent ID: 6485111
Filing Date: 2002-11-26
Classification: B60L,B60T

Abstract:
A method of controlling a driveline retarder brake system of a vehicle comprising the steps of:determining an operator braking input indicative of a desired vehicle deceleration, said step of determining including the step of determining a brake mode value selected from at least a first and second mode wherein said first mode corresponds to a higher desired vehicle deceleration rate for a given brake pedal treadle than said second mode; generating a desired retarder torque value (DT) corresponding to said desired vehicle deceleration value; determining a wheel speed value for each wheel of said vehicle; generating a front-to-rear wheel slip (FRS) value indicative of rear wheel lockup as a function of said wheel speed values; generating a retarder torque reduction (TR) value as a function of said FRS value; generating a desired retarder torque command (TC) corresponding to said desired vehicle deceleration value and said retarder torque reduction value; and controlling said retarder as a function of said retarder torque value to achieve said desired vehicle deceleration.