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

1990-03-20

1991-01-22

Marmor, Charles A.

Motor vehicles

Having four wheels driven

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

180233, 3644241, B60K 2308, G06F 1310, G06G 763

Patent

active

049863886

ABSTRACT:
A control system for a 4WD vehicle includes a drive system for directly transmitting a torque to primary drive wheels, and transmitting a torque to secondary drive wheels through a torque distributing clutch, at least one sensor for determining a front and rear wheel speed difference, at least one sensor for determining a lateral acceleration, and a control unit for controlling the engagement force of the clutch. When the primary wheel speed is lower than the secondary wheel speed, the control unit holds the clutch engagement force equal to zero to improve the steering response until the absolute value of the wheel speed difference reaches a predetermined level, and increase the clutch engagement force in accordance with the absolute value of the wheel speed difference to improve the vehicle stability after the absolute value of the wheel speed difference exceeds the predetermined level.

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
patent: 4846298 (1989-07-01), Naito
patent: 4874056 (1989-10-01), Naito
patent: 4887689 (1989-12-01), Naito

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