| abstract |
An object of the present invention is to improve the responsiveness of shifting to a four-wheel drive state at the time of starting while avoiding a shock when a clutch is engaged. When the rotational speed of a motor and the rotational speed of a rear wheel become equal to or lower than detectable allowable rotational speeds LMS and LWS, respectively, counting down of estimated times TMS and TWS from the detected values up to the start of the rotation is started. When both the estimated times TMS and TWS become zero after the countdown, the clutch is connected to ensure that the clutch is connected without any shock. [Selection diagram] Fig. 1 |