Electric control apparatus for transfer device in part-time four

Details Electric control apparatus for transfer device in part-time four Electric control apparatus for transfer device in part-time four

1990-04-02

1991-07-23

Hill, Mitchell J.

Motor vehicles

Having four wheels driven

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

180233, 180247, B60K 1734

Patent

active

050335758

ABSTRACT:
In a part-time four-wheel drive vehicle, and electric control apparatus for a transfer device in drive connection to a front or rear differential is arranged to permit selection of the four-wheel drive mode at the transfer device during travel of the vehicle in the two-wheel drive mode only in a condition where travel speed of the vehicle and temperature of lubricating oil in the differential are in a predetermined allowable region. The allowable region is defined to permit engagement of a clutch mechanism in the transfer drive mode without causing any heavy load acting thereon.

REFERENCES:
patent: 4452274 (1984-06-01), Haga et al.
patent: 4539447 (1985-09-01), Mizutani et al.
patent: 4771852 (1988-09-01), Nishikawa et al.
patent: 4854414 (1989-08-01), Koide et al.
patent: 4895217 (1990-01-01), Hueckler et al.
SAE Technical Paper Series, "1988 Lincoln Continental Variable-Assist Power Steering System", J. J. Duffy-2/1988.
Marks' Handbook for Mechanical Engineers-pp. 11-11, 11-12, 11-13.

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