Patent ID: 7487027
Filing Date: 2009-02-03
Classification: F16H,Y10T

Abstract:
1. 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 provided from the hydraulic pressure controlling device for forming a plurality of shift stages by combination of the engagement and the disengagement of the friction engaging elements, comprising; 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 from a predetermined shift start determining reference time to a time when the engagement is started; 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 after the engagement is started; a first correcting means for correcting a pre-charge time when the shift start time period calculated by the shift start time period calculating means is not within a predetermined target area depending on a difference between the target area and the shift start time period, and learning-setting the corrected amount, and a second correcting means for correcting a standby pressure when the input rotation change rate calculated by the input rotation change rate detecting means is not within a predetermined target area depending on a difference between the target area and the input rotation change rate, and learning-setting the corrected amount.