Patent ID: 6591178
Filing Date: 2003-07-08
Classification: B60G,B60K,B60T,B60W

Abstract:
A method for controlling the traction of a driven wheel included in a plurality of wheels supporting a vehicle on a road surface, the vehicle having a propulsion unit for supplying power to the driven wheel and a brake for braking the driven wheel, the method comprising the steps:providing a road roughness signal indicating a level of roughness of the road surface; when the road roughness signal indicates a first level of road roughness, modulating brake pressure to the driven wheel to maintain the speed of the driven wheel at a first target wheel speed greater than an undriven wheel speed of the vehicle by a first calibrated delta target wheel speed value and providing a first level of power reduction to the driven wheel from the vehicle propulsion unit; and when the road roughness signal indicates a second level of road roughness greater than the first level of road roughness, modulating brake pressure to the driven wheel of the vehicle to maintain the speed of the driven wheel at a second target wheel speed greater than an undriven wheel speed of the vehicle by a second calibrated delta target wheel speed value greater than the first calibrated delta target wheel speed value and providing a second level of power reduction to the driven wheel from the propulsion unit, the second level of power reduction being less than the first level of power reduction.