FOUR-WHEEL DRIVE VEHICLE AND CONTROLLER FOR THE SAME

PROBLEM TO BE SOLVED: To quickly shift from a two-wheel drive state to a four-wheel drive state, while suppressing vibration of a propeller shaft in shifting from the two-wheel drive state to the four-wheel drive state.SOLUTION: A four-wheel drive vehicle 100 includes an engagement clutch 3 which is provided between a propeller shaft 2 and an engine 102, a torque coupling 4 which is provided between a rear differential 107 and a rear wheel 105a, and an ECU 5 which controls the engagement clutch and the torque coupling. The ECU sets the amount of torque transmission to a second torque value T2 reduced lower than a first torque value, after accelerating the rotation of the propeller shaft, setting the amount of torque transmission by the torque coupling to the first torque value T1, when shifting the torque transmission by the engagement clutch and the torque coupling from a two-wheel drive state, where both are cut off, to a four-wheel drive state, and it puts the engagement clutch in an engagement state, when the rotations of the first and second rotating members 31 and 32 in the engagement clutch are synchronized.