Motor vehicles – Having four wheels driven – With differential means for driving two wheel sets at...
Patent
1995-12-21
1998-04-21
Hurley, Kevin
Motor vehicles
Having four wheels driven
With differential means for driving two wheel sets at...
364424098, B60K 1735
Patent
active
057408777
ABSTRACT:
A driving-torque distribution control system for a four-wheel drive vehicle, comprises a transfer having a transfer clutch for variably adjusting a front and rear drive-wheel torque distribution, and a torque-split controller for setting a weighting coefficient to a lower speed of rotational speeds of secondary drive wheels depending on a wheel-load shift between the secondary drive wheels e.g. a lateral acceleration exerted on the vehicle or a rolling moment. The controller calculates a simple mean of rotational speeds of primary drive wheels, and also calculates a weighted mean of rotational speeds of the secondary drive wheels based on the weighting coefficient so as to control the transfer clutch in accordance with the front and rear drive-wheel torque distribution based on a difference between the simple mean and the weighted mean. The weighting coefficient is held constant until the lateral acceleration exceeds a predetermined threshold.
REFERENCES:
patent: 5060747 (1991-10-01), Eto
patent: 5270930 (1993-12-01), Ito et al.
patent: 5346032 (1994-09-01), Sasaki
Hurley Kevin
Nissan Motor Co,. Ltd.
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