Power transmission system for a four-wheel drive vehicle

Details Power transmission system for a four-wheel drive vehicle Power transmission system for a four-wheel drive vehicle

1988-02-23

1989-06-06

Marmor, Charles A.

Motor vehicles

Having four wheels driven

With manually operated means for disengaging drive to one or...

180197, 180248, B60K 1734

Patent

active

048363227

ABSTRACT:
A power transmission system for a four-wheel drive vehicle has an automatic transmission for transmitting power of an engine to main driving wheels and a transfer clutch for transmitting the power to auxiliary driving wheels. First and second vehicle speed sensors are provided for sensing vehicle speed dependent on the main driving wheels and the auxiliary driving wheels, respectively. A two-wheel drive switch is provided for producing a two-wheel drive signal. The automatic transmission uses an output signal of the first vehicle speed sensor as data representing driving conditions of the vehicle. In response to the two-wheel drive signal, the transfer clutch is disengaged and an output signal of the second vehicle speed sensor is selected as vehicle speed.

REFERENCES:
patent: 4466502 (1984-08-01), Sakai
patent: 4556134 (1985-12-01), Takano
patent: 4576061 (1986-03-01), Yamakawa et al.
patent: 4586583 (1986-05-01), Yamakawa et al.

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