Patent ID: 6698541
Filing Date: 2004-03-02
Classification: B60K

Abstract:
A driving force distributing apparatus for a vehicle for transmitting an engine output, in which an output of a prime mover is transmitted directly to main drive wheels, and to auxiliary drive wheels via a coupling unit, comprising:basic torque setting means for setting a basic torque to be transmitted to said auxiliary drive wheels, on the basis of a driving state of the vehicle; theoretical acceleration setting means for setting a theoretical acceleration at a time of running on a flat road on the basis of an equation of motion of the vehicle from the engine output and a driving force determined by preset vehicle specifications; estimated acceleration setting means for computing an estimated acceleration from a wheel speed; auxiliary drive wheel torque setting means for setting an auxiliary drive wheel torque on the basis of a road gradient determined by comparing said theoretical acceleration and said estimated acceleration; and driving means for driving said coupling unit to generate a transmission torque corresponding to said auxiliary drive wheel torque.