Patent ID: 7248957
Filing Date: 2007-07-24
Classification: B60K,B60W,Y10T

Abstract:
1. A control device for an at least partially four-wheel-driven motor vehicle, having a control unit which variably distributes driving torque of a drive unit as a function of operating conditions to primary driving wheels, which are permanently connected with the drive unit, and to secondary driving wheels which, if required, can be connected by way of a transfer clutch with the drive unit, wherein the control unit determines a desired clutch torque which is to be set by an actuator device at the transfer clutch; wherein the vehicle speed is an operating condition; wherein, when the desired clutch torque is determined, at least one defined high-speed range is taken into account; wherein a speed-range-related clutch torque assigned to the defined high-speed range is defined as a maximally permissible limit torque; and wherein, when the defined high-speed range is present, the speed-range-related clutch torque is a clutch torque course by which, alternately, an increase and a decrease of the clutch torque is defined.