| 主权项 |
1. A control system for a four-wheel drive vehicle, the four-wheel drive vehicle including an engine, main drive wheels to which power is transmitted from the engine while the vehicle is traveling in a two-wheel drive mode or in a four-wheel drive mode, auxiliary drive wheels to which power is transmitted from the engine while the vehicle is traveling in the four-wheel drive mode, an automatic transmission provided in a power transmission path between the engine and the main drive wheels, the automatic transmission provided in a power transmission path between the engine and the auxiliary drive wheels, and a disconnect mechanism provided in a power transmission path between the automatic transmission and the auxiliary drive wheels, the disconnect mechanism being configured to disconnect a predetermined rotating element from the engine and the auxiliary drive wheels while the vehicle is traveling in the two-wheel drive mode, the predetermined rotating element being configured to transmit power to the auxiliary drive wheels while the vehicle is traveling in the four-wheel drive mode,
the control system comprising: an electronic control unit configured to:
(a) execute shift control when a shift condition of the automatic transmission is satisfied;(b) selectively engage or release the disconnect mechanism based on a traveling state of the vehicle and a driver's predetermined operation; and(c) control at least one of the automatic transmission or the disconnect mechanism such that a shift period based on the shift condition of the automatic transmission and an engagement-release period of the disconnect mechanism at least partially overlap with each other. |
