Patent ID: 7315776
Filing Date: 2008-01-01
Classification: B60K

Abstract:
1. A control device for an at least part-time 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 an actuator device at the transfer clutch, wherein the control unit consists of a main control unit and an additional control unit, the main control unit computing the desired clutch torque as a function of detected or determined parameters, the desired clutch torque being transmitted to the additional control unit, and the additional control unit converting the desired clutch torque to a corresponding electric control signal for the actuator device; wherein the main control unit and the additional control unit are connected with one another by way of a CAN data bus; wherein the additional control unit is spatially separated from the main control unit and is arranged in proximity of the transfer clutch; and wherein the additional control unit receives additional input quantities with which the additional control unit can carry out an emergency running function in the event of a defined defect.