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

1988-11-30

1989-12-19

Pekar, John A.

Motor vehicles

Having four wheels driven

3644241, B60K 1734

Patent

active

048876895

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 conditions of the vehicle to determine a vehicle speed, and a front and rear wheel speed difference obtained by subtracting a front wheel speed from a rear wheel speed, and a control unit for controlling the front wheel driving force substantially continuously by controlling the engagement force of the transfer clutch. The control unit includes a first calculating section for calculating a slip dependent clutch engagement force which increases as the absolute value of the front and rear wheel speed difference increases, a second calculating section for calculating a vehicle speed dependent clutch engagement force which increases as the vehicle speed increases, and a selecting section for determining a final desired transfer clutch engagement force by selecting the greater of the results of the first and second calculating sections. 7

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