Patent ID: 7188018

Claim:
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 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 means of an actuator device at the transfer clutch, wherein, when the desired clutch torque is determined, at least one degree of stress to the transfer clutch or at least one degree of stress to the actuator device are taken into account; wherein a short-duration degree of stress and a long-duration degree of stress to the transfer clutch are taken into account, a rising short-duration degree of stress having a torque-increasing effect when determining the desired clutch torque, and a rising long-duration degree of stress having a torque-reducing effect when determining the desired clutch torque, wherein the taking into account of the short-duration degree of stress is assigned a higher priority than the taking into account of the long-duration degree of stress.