Four-wheel drive system with differential control response to ti

Details Four-wheel drive system with differential control response to ti Four-wheel drive system with differential control response to ti

1986-08-01

1987-06-02

Tanner, Harry

Motor vehicles

Having four wheels driven

With differential means for driving two wheel sets at...

747105, B60K 1734

Patent

active

046695699

ABSTRACT:
A four-wheel drive system has a center differential between front and rear wheels, and means for restraining or locking the center differential. The four-wheel drive system is equipped with an automatic control system for automatically locking the center differential when a coefficient of friction between a road surface and a tire of at least one wheel is equal to or lower than a predetermined value. The coefficient of friction is determined by sensing a steering angle, a vehicle speed, a normal load and a steering force, or by sensing an ambient temperature and a humidity. The control system may be arranged to lock the center differential only when the vehicle speed is equal to or lower than a predetermined speed.

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