Device for controlling vehicle four wheel drive front/rear coupl

Details Device for controlling vehicle four wheel drive front/rear coupl Device for controlling vehicle four wheel drive front/rear coupl

1987-06-08

1989-09-12

Lall, Parshotam S.

Boots, shoes, and leggings

3644241, 180249, 180197, B60K 1734

Patent

active

048666246

ABSTRACT:
In a four wheel drive vehicle, a four wheel drive device receives rotational power from an engine and provides it to the combination of the front wheels of the vehicle and also to the combination of the rear wheels of the vehicle. A device is provided for selectively coupling the rotation of the combination of the front vehicle wheels and the rotation of the combination of the rear vehicle wheels. A control device is provided for this front/rear coupling device, and includes: (a) a means for detecting the rotational speed of the combination of the front wheels of the vehicle; (b) a means for detecting the rotational speed of the combination of the rear wheels of the vehicle; and: (c) a means for controlling the front/rear coupling device, so that its operation is substantially not restricted when the discrepancy between the rotational speed of the combination of the front wheels of the vehicle and the rotational speed of the combination of the rear wheels of the vehicle is not greater than a certain threshold value; while, when the discrepancy between the rotational speed of the combination of the front wheels of the vehicle and the rotational speed of the combination of the rear wheels of the vehicle is greater than the certain threshold value, coupling between the rotation of the combination of the front vehicle wheels and the rotation of the combination of the rear vehicle wheels is substantially prohibited. The method of operation of this device is also disclosed.

REFERENCES:
patent: 4298085 (1981-11-01), Moroto et al.
patent: 4552241 (1985-11-01), Suzuki
patent: 4589511 (1986-05-01), Leiber
patent: 4699236 (1987-10-01), Morisawa et al.
patent: 4702341 (1987-10-01), Taga et al.
patent: 4729450 (1988-03-01), Morisawa et al.
patent: 4751856 (1988-06-01), Nakamura et al.
patent: 4757870 (1988-07-01), Torii et al.

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