Shift control apparatus for automatic transmission

Details Shift control apparatus for automatic transmission Shift control apparatus for automatic transmission

2006-04-25

2006-04-25

Lewis, Tisha (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

C477S145000, C477S150000

Reexamination Certificate

active

07033297

ABSTRACT:
A shift control apparatus for controlling shifting actions of an automatic transmission including a hydraulically operated frictional coupling device having a hydraulic cylinder which is supplied with a working fluid when the frictional coupling device is engaged, the shift control apparatus including a transient-hydraulic-pressure control device operable to control a transient value of a hydraulic pressure in the hydraulic cylinder according to an electric signal, upon releasing of the frictional coupling device, and an accumulator having a back-pressure chamber a back pressure of which is controllable, and an accumulator chamber connected to the hydraulic cylinder of the frictional coupling device and operable to control a transient value of the hydraulic pressure in the hydraulic cylinder, when the frictional coupling device is engaged with the working fluid being supplied to the hydraulic cylinder, and a back-pressure increasing portion operable to increase the back pressure in the back-pressure chamber of the accumulator for rapidly discharging the working fluid from the accumulator chamber, when the frictional coupling device is released to effect one of the shifting actions of the automatic transmission.

REFERENCES:
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Instruction Manual for New Model “Land Cruiser 100”, Published on Aug. 5, 2002, 1 page.

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