Differential control system for four-wheel drive vehicle.

摘要

A four-wheel drive vehicle has a center differential (6) which transmits the output torque of a power plant (P) to both front (13,15) and rear wheels (19,22) in such a manner as to permit the front (13,15) and rear wheels (19,22) to rotate at different speeds. A differential control system has a differential rotation limit member which acts on the center differential (16) to limit differential rotation of the front and rear wheels to a degree which is determined according to the difference in rotational speed between the front and rear wheels. The degree of limitation on the differential rotation of the wheels is determined according to the difference in rotational speed between the front and rear wheels based on first characteristics when the rotational speed of the front wheels is higher than that of the rear wheels and based on second characteristics when the rotational speed of the rear wheels is higher than that of the front wheels. The first and second characteristics are set separately from each other. <IMAGE>