Torque split control system for a four wheel drive vehicle

Details Torque split control system for a four wheel drive vehicle Torque split control system for a four wheel drive vehicle

1990-04-02

1991-10-29

Rice, Kenneth R.

Motor vehicles

With means for detecting wheel slip during vehicle...

180249, 3644241, B60K 1735

Patent

active

050607472

ABSTRACT:
A driving force distribution control system for a 4WD vehicle includes a torque distributing clutch for varying a driving force transmitted to secondary drive wheels such as front wheels in response to a control signal, one or more sensors for determining a vehicle speed, and a measured wheel speed difference between a sensed speed of primary drive wheels such as rear wheels and a sensed speed of the secondary drive wheels, and a controller for producing the control signal. The controller determines a correction quantity which increases as the vehicle speed increases, further determines a corrected wheel speed difference by subtracting the correction quantity from the measured wheel speed difference in order to eliminate an undesired influence of a tire diameter difference between the front and rear wheels, and produces the control signal in accordance with the corrected wheel speed difference.

REFERENCES:
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patent: 4754834 (1988-07-01), Ozaki et al.
patent: 4757870 (1988-07-01), Torii et al.
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patent: 4776424 (1988-10-01), Naito
patent: 4825368 (1989-04-01), Itoh et al.
patent: 4846298 (1989-07-01), Naito
patent: 4874056 (1989-10-01), Naito
patent: 4887689 (1989-12-01), Naito
patent: 4961476 (1990-10-01), Witte et al.

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