Driving force distribution control system for 4WD vehicle

Details Driving force distribution control system for 4WD vehicle Driving force distribution control system for 4WD vehicle

1988-10-07

1989-07-11

Pekar, John A.

Motor vehicles

Having four wheels driven

3644241, B60K 17344, B60K 2308

Patent

active

048462985

ABSTRACT:
A driving force distribution control system for a 4WD vehicle includes a transfer clutch for continuously varying a front wheel driving force transmitted to front wheels, a sensor group for sensing a front wheel speed, a rear wheel speed and a vehicle speed, and a control unit for continuously controlling the front wheel driving force by controlling the engagement force of the transfer clutch. The control unit is arranged to vary the driving force distribution from a 2WD mode toward a 4WD mode in accordance with a front and rear wheel speed difference when the front wheel speed is higher than the rear wheel speed, and at the same time the vehicle speed is higher than a predetermined reference speed. Therefore, the control system can improve the stability of the vehicle during engine braking, and prevent tight corner braking at low vehicle speeds.

REFERENCES:
patent: 4754834 (1988-07-01), Ozaki et al.
patent: 4757870 (1988-07-01), Torii et al.
patent: 4773500 (1988-09-01), Naito et al.
patent: 4776424 (1988-10-01), Naito

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