Four-wheel drive torque transfer mechanism

Details Four-wheel drive torque transfer mechanism Four-wheel drive torque transfer mechanism

1992-05-04

1994-04-12

Focarino, Margaret A.

Motor vehicles

Having four wheels driven

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

180197, 3644241, B60K 1735

Patent

active

053017684

ABSTRACT:
A four-wheel drive torque transfer mechanism splits torque from the transmission gearing section of a vehicle into a front-wheel torque and a rear-wheel torque, transmitting the front-wheel torque to the front-wheel drive shafts and the rear-wheel torque to the rear-wheel drive shafts. A central differential connected to the transmission gearing section distributes the torque from the transmission gearing section. A central differential limiting mechanism, provided between the input and output sides of the central differential, limits the rotary differential operation of the differential arrangement responsive to a control torque signal. Control gain values representing optimized turning characteristics are calculated for each of the turning conditions of the vehicle and stored in a memory. A controller for controlling the differential limiting mechanism reads the control gain values from the memory and calculates the products of detected turning conditions and the control gain values corresponding thereto. The controller further calculates the sum of the products and generates the control torque signal in accordance with that calculated sum.

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Wong, J. Y., Ph.D., Theory of Ground Vehicles, John Wiley & Sons, New York, pp. 210-239.
SAE Technical Paper Series, 880701, Margolis, Donald L. and Frank, Andrew A., "Directional Stability Augmentation for All Wheel Drive Vehicles".
Cohen, Alan M., Numerical Analysis, Halsted Press, New York pp. 296-307, 334-335.

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