WHEEL DRIVE FORCE DISTRIBUTION CONTROL SYSTEM

PROBLEM TO BE SOLVED: To provide a wheel drive force distribution control system for restraining the heat generation of a torque transmission means even if difference in an outer diameter is generated in front and rear wheels. SOLUTION: In the wheel drive force distribution control system 90, a rotational difference torque command value is determined based on the cancellation of a natural rotary speed difference ΔNh due to the outer diameter difference of the front and rear wheels 14, 15 from a rotary speed difference ΔNi in the front and rear wheels 14, 15 during drive for controlling a transmission torque to the rear wheel 15, thus permitting a drive while the natural rotary speed difference ΔNh is present between the front and rear wheels 14, 15, and restraining the heat generation of the torque-transmitting apparatus 30. Additionally, every time when an automobile becomes steady conditions, the natural rotary speed difference ΔNh to be cancelled is updated, thus also coping with a change in the outer diameter difference in the front and rear wheels 14, 15. COPYRIGHT: (C)2004,JPO