Hydraulic control system for automatic transmission

Details Hydraulic control system for automatic transmission Hydraulic control system for automatic transmission

1995-11-24

1997-04-01

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

F16H 6100

Patent

active

056160941

ABSTRACT:
A hydraulic control system for an automatic transmission includes a regulator valve in a hydraulic circuit for supplying pressure to a servo of a frictional engagement element. The regulator valve has an input port, an output port and a drain port. A valve member of the regulator valve includes a pressure receiving area fed with a feedback pressure from the portion of the hydraulic circuit between the regulator valve and the servo, and another pressure receiving area selectively fed with pressure from a signal pressure source. A further pressure receiving area, having a surface area different from the another pressure receiving area, is constantly fed pressure from the signal pressure source.

REFERENCES:
patent: 5109734 (1992-05-01), Fujiwara
patent: 5291804 (1994-03-01), Kashihara et al.

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