| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a driving force control device of a four-wheel drive vehicle capable of realizing sufficient traction performance and bad road ejection on even an extremely low μ road by simple constitution. <P>SOLUTION: When a control is transferred from a 4WD control to an FF control since four-wheel vehicle speed V becomes more than set vehicle speed Vc, a clutch mechanism part 30 for transmitting motor driving force to rear wheels 14rl and 14rr is released for set time t1 and slip states of wheels are decided from vehicle speed changed amount ΔVr based on wheel speed of the rear wheels 14rl and 14rr for the time. Since the rear wheels 14rl and 14rr become driven wheels at the time, grip force is recovered also when the wheels are in the slip states. By refastening the clutch mechanism part 30 when it is decided that the wheels are in the slip states, the motor driving force is transmitted to a road surface by the rear wheels 14rl and 14rr recovered with the grip force, and the sufficient traction performance and bad road ejection on the extremely low μ road are realized. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
