System for controlling a transfer clutch of a four-wheel drive v

Details System for controlling a transfer clutch of a four-wheel drive v System for controlling a transfer clutch of a four-wheel drive v

1989-03-06

1990-04-10

Marmor, Charles A.

Motor vehicles

Having four wheels driven

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

36442401, B60K 2308

Patent

active

049151894

ABSTRACT:
A control system for a four-wheel drive vehicle having a continuously variable transmission, and a fluid operated transfer clutch for transmitting the output of the transmission to auxiliary drive wheels is disclosed. A transfer control valve is provided for changing the amount of oil supplied to the transfer clutch to selectively engage the clutch, and a three-way solenoid operated control valve is provided for controlling oil supplied to the transfer control. The solenoid operated control valve has a first port communicated with a pump, a second port communicated with the transfer control valve, a drain port, a valve body selectively closing the first port and the drain port. The solenoid operated control valve is operated by a pulse train. The duty ratio of the pulse train is controlled for rendering amount of drain oil from the drain port minimum at the changing the amount of the oil to the transfer clutch between the engagement and disengagement of the clutch.

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