Part-time four-wheel drive system with braking force responsive

Details Part-time four-wheel drive system with braking force responsive Part-time four-wheel drive system with braking force responsive

1984-03-15

1986-04-15

Jones, Larry

Motor vehicles

Having four wheels driven

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

180140, 180142, 192 358, 74740, 74856, B60K 2308, F16H 3700

Patent

active

045821593

ABSTRACT:
A four-wheel drive system of a part-time type having a two-wheel drive mode and a four-wheel drive mode is provided with an automatic control system for automatically changing the condition of the drive system from the two-wheel drive mode to the four-wheel drive mode when the braking force of the vehicle becomes equal to or higher than a predetermined value. The control system may have means for determining a coefficient of friction between the tire and road surface to change the drive system to the four-wheel drive mode at a low braking force level when the sensed coefficient of friction is low.

REFERENCES:
patent: 3548980 (1970-12-01), Schmidt
patent: 3756358 (1973-09-01), Espenschied et al.
patent: 3897846 (1975-08-01), Inoue
patent: 4369671 (1983-01-01), Matsumoto et al.
patent: 4417641 (1983-11-01), Kageyama
patent: 4441572 (1984-04-01), Ito et al.
patent: 4470489 (1984-09-01), Makita
patent: 4484654 (1984-11-01), Hayakawa

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