| 摘要 |
PROBLEM TO BE SOLVED: To provide a four-wheel-drive vehicle in which yaw moment optimum to the vehicle is generated by efficiently adding driving force and braking force to appropriate wheels.SOLUTION: The control device for a four-wheel-drive vehicle is configured to: calculate target braking and driving force Fx according to a target yaw moment Mzt for suppressing an understeer tendency of a vehicle; calculate target drive force Fd for a turning outer wheel of a rear shaft freely added to the vehicle by driving force distribution control by a transfer clutch 15 and right and left wheel clutch 17l and 17r; and calculate as target braking and driving force Fb for a turning inner wheel, a shortage of the target driving force Fd for the turning outer wheel of the rear shaft by comparison of the target braking and driving force Fx with the target driving force Fd for the turning outer wheel of the rear shaft. The target driving force Fd for the turning outer wheel of the rear shaft engages a wheel clutch near the turning outer wheel of the rear shaft and disengages a wheel clutch near the turning inner wheel to control and generate engagement force of the transfer clutch 15. The target braking and driving force Fb for the turning inner wheel is distributed back and forth and added according to a driver's will to accelerate. |
