Four wheel drive system having driving force distribution contro

Details Four wheel drive system having driving force distribution contro Four wheel drive system having driving force distribution contro

1986-01-21

1988-07-05

Mitchell, David M.

Motor vehicles

Having four wheels driven

74866, 180247, 192 0076, 3644241, B60K 2308

Patent

active

047548347

ABSTRACT:
A four wheel drive system of a vehicle has a transfer clutch capable of varying torque transmitted therethrough from an engine to front wheels. This torque is controlled by a driving force distribution control unit in response to sensor signals of vehicle cornering behavior sensor such as a lateral acceleration sensor, vehicle speed sensor, transmission gear position sensor, and accelerator position sensor. The control unit determines a driving force distribution ratio between the front wheel driving force and the rear wheel driving force in accordance with the sensed lateral acceleration in such a manner that the share of the driving force apportioned to the front wheels is decreased with increase of the lateral acceleration. The control unit estimates a total driving force produced by the engine and transmitted through the transmission to the transfer, from the vehicle speed, gear position and accelerator position, and determines the torque of the transfer clutch from the total driving force and the distribution ratio.

REFERENCES:
patent: 4466502 (1984-08-01), Sakai
patent: 4473143 (1984-09-01), Windsor
patent: 4484653 (1984-11-01), Horikoshi et al.
patent: 4497397 (1985-02-01), Windsor et al.
patent: 4558414 (1985-12-01), Sakakiyama
patent: 4558772 (1985-12-01), Grimes et al.
patent: 4562541 (1985-12-01), Sakakiyama
patent: 4583627 (1986-04-01), Kumura et al.
patent: 4586583 (1986-05-01), Yamakawa et al.
Jidosha Kogaku, published by Tetsudo Nihon Company, Ltd., vol. 33, No. 8, pp. 56-62, Aug. 1, 1984. (Japanese)

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