Hydraulic control system for lowering the duty ratio when the pr

Details Hydraulic control system for lowering the duty ratio when the pr Hydraulic control system for lowering the duty ratio when the pr

1995-05-19

1997-03-18

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Control by sensed ambient condition, pattern indicia,...

477156, 477174, F16H 100

Patent

active

056117523

ABSTRACT:
A hydraulic control system for an automatic transmission includes a three-way duty solenoid valve which is driven at a duty rate to regulate pressure at its input port and develop a controlled pressure at its output port leading to a frictional coupling element for shifting the automatic transmission to a specific mode. The duty rate is changed depending upon driving conditions so that the controlled pressure is forced to reach a desired hydraulic pressure according to driving conditions.

REFERENCES:
patent: 4998449 (1991-03-01), Baba et al.
patent: 5261295 (1993-11-01), Iwanaga et al.
patent: 5449329 (1995-09-01), Brandon et al.

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