Upshift control device for automatic transmission

Details Upshift control device for automatic transmission Upshift control device for automatic transmission

1997-07-28

1999-01-12

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

475129, F16H 6108

Patent

active

058579354

ABSTRACT:
An upshift control device for an automatic transmission is provided in which the transmission is shifted up by releasing an oil pressure from a first engaging element that has been engaged while applying an oil pressure to a second engaging element that has been released. This upshift control device includes engine racing detecting means for detecting racing of an engine of the vehicle during upshifting, and engine racing preventive control mans for generating to an actuator of a timing valve a command to temporarily apply a pressure to a back pressure chamber of a first accumulator which is provided in an oil path leading to the first engaging element and from which the pressure has been released, when racing of the engine is detected after the upshift command is generated.

REFERENCES:
patent: 3942393 (1976-03-01), Forster et al.
patent: 3956947 (1976-05-01), Leising et al.

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