| 摘要 |
A four wheel drive system of a vehicle has a multiple disc friction type transfer clutch capable of varying torque transmitted to front wheels, a hydraulic circuit for varying an engagement force of the transfer clutch by supplying a fluid pressure to the transfer clutch, front and rear wheel rotational speed sensors, a sensor for sensing a turning radius corresponding to a steering angle, and a control unit for varying the torque transmitted to the front wheels by sending a control signal to the hydraulic circuit in accordance with a front and rear wheel speed difference, a vehicle speed and the turning radius.
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