Fail-safe driving torque distribution control system for 4WD veh

Details Fail-safe driving torque distribution control system for 4WD veh Fail-safe driving torque distribution control system for 4WD veh

1989-08-31

1991-07-16

Chin, Gary

Boots, shoes, and leggings

3644241, 180233, B60K 1734

Patent

active

050329952

ABSTRACT:
A fail-safe control system includes one or more circuits for detecting failures in sensors and an actuator of a driving force distribution control system of a 4WD vehicle, and a fail-safe means which, if a failure is detected, gradually disengage a transfer clutch until the 2WD state is reached, in such a gradual manner as to prevent spin or drift-out of the vehicle. The fail-safe means may decrease the magnitude of an electric control signal gradually, or may employ a fail-safe valve for gradually decreasing a fluid pressure supplied to the transfer clutch.

REFERENCES:
patent: 4699236 (1987-10-01), Morisawa et al.
patent: 4702341 (1987-10-01), Taga et al.
patent: 4744437 (1988-05-01), Matsumoto
patent: 4754835 (1988-07-01), Stelter et al.
patent: 4867262 (1989-09-01), Takada et al.
patent: 4874056 (1989-10-01), Naito
patent: 4887689 (1989-12-01), Naito
patent: 4912639 (1990-03-01), Kawamoto

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