| 摘要 |
PROBLEM TO BE SOLVED: To improve responsiveness by making a propeller shaft smoothly and quickly rotate and synchronized without causing an uncomfortable and unnecessary speed reduction feeling and a shock (fore-and-aft jerk) by effectively utilizing energy which is already generated without consuming new energy.SOLUTION: When a main drive shaft and a sub-drive shaft are in slip states, it is determined that a four-wheel drive condition that a drive force is transmitted from the main drive shaft to the sub-drive shaft is established, when the rotation of a propeller shaft 5 and the rotation of the sub-drive shaft are not synchronized with each other, an excess drive torque Ta or an excess rotation energy Ea of a main drive system is calculated, a clutch torque Tc for fastening a synchronous clutch 15 is calculated on the basis of at least the excess drive torque Ta or the excess rotation energy Ea, the synchronous clutch 15 is fastened and controlled, and on the other hand, when the synchronization of the rotation of the propeller shaft 5 and the rotation of the sub-drive shaft is finished, left and right wheel clutches 17l, 17r are fastened. |
