| 摘要 |
A system is for a four-wheel drive vehicle for automatically changing the transmission of the engine of the vehicle from two-wheel drive to four-wheel drive or vice versa in accordance with the driving condition. The transmission transmits power from the engine to two main wheels, and an electromagnetic clutch having a magnetizing coil transmits the power of the engine to drive two auxiliary wheels. A steering angle sensor produces an output signal when the steering angle exceeds a predetermined value, and a control circuit controls the clutch current applied to the coil of the electromagnetic clutch. The control circuit operates such that when the output signal of the steering angle sensor is applied thereto, the clutch current is cut off so as to disengage the electromagnetic clutch so as to provide two-wheel driving.
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