Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Transmission control
Reexamination Certificate
2004-09-24
2009-02-03
To, Tuan C (Department: 3663)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Transmission control
C477S156000, C477S176000, C074S336001
Reexamination Certificate
active
07487027
ABSTRACT:
A hydraulic pressure controlling device for an automatic transmission controlling a plurality of friction engaging elements to be engaged and disengaged by controlling a hydraulic pressure comprises a shift lever operation detecting means, an input rotation detecting means for monitoring an input shaft rotation number, a shift start time period calculating means for judging that an engagement of each friction engaging element is started when the input shaft rotation number is decreased at a predetermined rotation number and calculating a shift start time period, an input rotation change rate detecting means for calculating an input shaft rotation change rate when the input shaft rotation number is decreased by a predetermined rotation number, and a correcting and leaning-setting means for correcting a pre-charge time and a standby pressure based on the shift start time period and the input rotation change rate, and leaning-setting the pre-charge time in preference to the standby pressure.
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Aisin Seiki Kabushiki Kaisha
Buchanan & Ingersoll & Rooney PC
To Tuan C
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