| 摘要 |
PURPOSE:To make smooth starting performable even if a slip occurs in one of plural wheels, by increasing the extent of transfer torque capacity in a differential limiting device of a center differential gear by degrees at a time when a revolving speed differential between front and rear wheels is more than the specified value. CONSTITUTION:In 4WD vehicle, power of an internal combustion engine 1 is transmitted to a rear-wheel drive shaft 15 and a front-wheel drive shaft 17 via an automatic transmission 2 and 4-wheel driving transfer device 3. This 4-wheel driving transfer device 3 is provided with a center differential gear 10 which performs a differential action between front and rear wheels, and this center differential gear 10 is provided with a hydraulic-operated type differential control clutch 21 which is controlled by a hydraulic controller 22. In this case, this hydraulic controller 22 brings transfer torque capacity in the differential control clutch 21 to zero at a time when a revolving speed difference between front and rear wheels to be detected by each of speed sensors 46r and 46f, and at the time of more than the specified value, it is controlled by a controller 45 so as to gradually increase the said torque capacity.
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