Method and apparatus for controlling a line pressure of an automatic transmission
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United States of America Patent
Stats
-
Dec 14, 2010
Grant Date -
Apr 23, 2009
app pub date -
Dec 6, 2007
filing date -
Oct 19, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An apparatus and method for controlling line pressure of an automatic transmission. A driving information detection unit obtains information. A shift control unit determines if a power-on downshift is requested based on the information of the driving information detection unit, and controls the line pressure based on if the power-on downshift is requested. An actuator forms the line pressure according to a control signal of the shift control unit. A pressure supply control unit controls supply of the line pressure to on-coming and off-going frictional elements of the transmission. The method outputs a first value of a line pressure control duty if the power-on downshift is requested; subsequently outputs a second, lower value of the line pressure control duty if a first shifting is started during outputting of the first value; and subsequently outputs the first value if a turbine speed is greater than or equal to a predetermined speed.
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