| 摘要 |
PROBLEM TO BE SOLVED: To prevent a large torque from being temporarily generated on a driving force transmission device for connecting front and rear wheels of a four-wheel drive vehicle when it travels on a road in which a normal road surface and a lowμroad surface are mixed. SOLUTION: The front and rear wheels Tf1, Tf2, Tr1, Tr2 of the automobile driven by an engine 10 are connected by a differential control device 15 in which a transmitted torque is changeable and the transmitted torque of this differential control device is controlled by a control device 20 corresponding to the driving condition. The control device controls it such that the transmitted torque of the differential control device is reduced if any one of retardation of the rotation speed of the respective front and rear wheels becomes a predetermined first threshold value or higher. The control device operates a difference of an average value of the rotation speed of right and left rear wheels and an average value of the rotation speed of the right and left front wheels and in the case where a difference of the average values becomes a predetermined second threshold value or higher, the control device preferably controls it such that the transmitted torque of the differential control device is reduced. COPYRIGHT: (C)2004,JPO
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