Hydraulic control system for automatic transmission

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

2006-02-06

2010-10-19

Le, David D (Department: 3655)

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

C477S156000

Reexamination Certificate

active

07815545

ABSTRACT:
An automatic transmission hydraulic control apparatus includes an oil pump driven by an engine, a forward clutch arranged to be engaged by an engagement pressure from the oil pump at a start of the vehicle, a hydraulic pressure sensing section configured to sense a hydraulic pressure in the automatic transmission, a filling start judging section configured to judge a start of filling to the forward clutch in accordance with the sensed hydraulic pressure; and an engagement pressure control section configured to control the engagement pressure to go through a filling phase and an engagement phase. The engagement pressure control section shifts from the filling phase to the engagement phase when a predetermined time elapses from the judgment of the start of the filling to the forward clutch.

REFERENCES:
patent: 5908370 (1999-06-01), Kubo et al.
patent: 6411881 (2002-06-01), Thomas
patent: 7335133 (2008-02-01), Katou et al.
patent: 2003/0197385 (2003-10-01), Onoyama et al.
patent: 2004/0157700 (2004-08-01), Katou
patent: 2000-266172 (2000-09-01), None

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