Hydraulic pressure control apparatus and method for continuously variable transmission
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United States of America Patent
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Nov 4, 2008
Grant Date -
Apr 13, 2006
app pub date -
Oct 5, 2005
filing date -
Oct 7, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
In hydraulic pressure control apparatus and method for a continuously variable transmission, a line pressure of the continuously variable transmission is developed with a working oil supplied from an oil pump as an original pressure, and a command pressure is set to develop a line pressure target value of the target value in such a manner that the command pressure is maintained at a predetermined small value for a constant time and, thereafter, the value of the command pressure is raised up to the target value when a shift range of the continuously variable transmission is switched from a neutral range to a running range, the command pressure being raised at a rate lower than a step input to suppress an overshoot developed in the actual line pressure.
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