Method and system for releasing hydraulic pressure of...

Details Method and system for releasing hydraulic pressure of... Method and system for releasing hydraulic pressure of...

2008-07-11

2010-10-19

Wright, Dirk (Department: 3655)

Interrelated power delivery controls, including engine control

Transmission control

Control by sensed ambient condition, pattern indicia,...

Reexamination Certificate

active

07815544

ABSTRACT:
The present invention relates to a method and a system for releasing hydraulic pressure of an automatic transmission that improve shift responsiveness and stability of hydraulic pressure control as a consequence of quickly supplying to a pressure control valve as feedback pressure a part of operating pressure that is supplied from the pressure control valve to an off-going element in a case of releasing the off-going element. The method for releasing hydraulic pressure of an automatic transmission according to an exemplary embodiment of the present invention may include: determining whether a shift signal is detected; calculating a delay time TPSWaccording to oil temperature; maintaining a control duty at 0% during the delay time; and recovering the control duty to a release duty DRafter the delay time has passed.

REFERENCES:
patent: 5293789 (1994-03-01), Goto et al.
patent: 5611752 (1997-03-01), Kamada et al.
patent: 7128688 (2006-10-01), Katou
patent: 7264572 (2007-09-01), Jeon
patent: 2003/0233185 (2003-12-01), Takebayashi et al.
patent: 61-153045 (1986-07-01), None
patent: 07-208599 (1995-08-01), None
patent: 10-0387814 (2003-06-01), None

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