| 摘要 |
PURPOSE:To promote the reduction of a load applied to a parking device, by relaxing differential limit action by a differential lock mechanism when a parking shift is operated to actuate the parking device while a vehicle is in running under the four-wheel driven condition. CONSTITUTION:A transmission 30 of a four-wheel driven vehicle has a four- wheel driving transfer which contains an automatic transmission, differential mechanism and its lock mechanism 31. And when the vehicle, during its running, shifts a shift lever to a parking range to output a parking shift signal by a shift position sensor 35 to a control unit 34, a parking device, which is actuated in a condition that the vehicle is in a preset speed or less, inhibits all of the four wheels from rotation. In this case, when the differential mechanism is placed in a fixed condition by actuating the lock mechanism 31, it is switched to an unlocked condition by a control unit 34. In this way, a load by the parking device is applied to two wheels in either the front or the rear.
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