Automatic transmission and method of setting a standby oil...

Details Automatic transmission and method of setting a standby oil... Automatic transmission and method of setting a standby oil...

2006-09-12

2006-09-12

Ho, Ha (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

C477S117000, C477S121000, C477S159000

Reexamination Certificate

active

07104925

ABSTRACT:
Under the learning mode during a vehicle stationary condition, an oil pressure of the friction engagement element for setting a standby oil pressure value is increased by a predetermined step pressure while a transmission input shaft rotational speed has been maintained, and a standby oil pressure is set for shifting the friction engagement element to an engagement side. A controlled value is verified whether it is within a predetermined range corresponding to the predetermined step pressure when a change of the input value due to decrease of the turbine rotational speed satisfies a predetermined condition. The controlled value is learned when the controlled value is within the predetermined range corresponding to the step pressure. A step pressure larger than the step pressure is set when the controlled value is beyond the predetermined range corresponding to the step pressure.

REFERENCES:
patent: 5954776 (1999-09-01), Saito et al.
patent: 6684144 (2004-01-01), Sekii et al.
patent: 6754572 (2004-06-01), Kawamoto et al.
patent: 2003/0216218 (2003-11-01), Takagi
patent: 8-86351 (1996-04-01), None
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patent: 8-338519 (1996-12-01), None
patent: 2002-295529 (2002-10-01), None
patent: 2004-44715 (2004-02-01), None

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