| 摘要 |
PURPOSE:To suppress the temperature rise of the viscous fluid of a viscous clutch by setting the four-wheel driving clutch to a nonoperational state at every fixed time as far as the travel of a vehicle is not impaired. CONSTITUTION:Oil pressure control devices 9, 22 are operated based on the control signal from an electric control device 45 to perform the transfer control of the speed change stage of a transmission 7 and the transmitted torque control of a differential control clutch 21. The control device 45 outputs the signal for the transfer control of the speed change state of the transmission 7 to the oil pressure control devices 9, 22 in response to the speed change pattern predetermined in response to the manual shift range, vehicle speed, and throttle opening. The control device 45 also outputs the pulse signal with the predetermined duty ratio to control the transmitted torque capacity of the differential control clutch 21 to the servo oil pressure control valve of the device 22 in response to the speed change stage and throttle opening, and it cuts off the current to a valve and discharges the servo oil pressure to the differential control clutch 21 if predetermined conditions are met.
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