Hydraulic control system for automatic transmission
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United States of America Patent
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-
Oct 19, 2010
Grant Date -
Aug 24, 2006
app pub date -
Feb 6, 2006
filing date -
Feb 22, 2005
priority date (Note) -
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status (Latency Note)
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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.
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