Automatic transmission control having variable fluid pressure de

Details Automatic transmission control having variable fluid pressure de Automatic transmission control having variable fluid pressure de

1998-11-10

2000-03-28

Estremsky, Sherry L.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477149, 477154, F16H 6106, F16H 6108

Patent

active

060425067

ABSTRACT:
A vehicle automatic transmission control controls fluid pressure changes applied to a frictional engagement element which is being changed from an engaged state to a disengaged state at a stage before input shaft rotational speed starts to increase from the beginning of a down-shift control. The control instruction value is set to gradually decrease the applied fluid pressure and to increase the ratio of such decrease with elapsed time. Specifically, a solenoid is used to control the fluid pressure applied to a clutch. The duty-cycle instruction for the solenoid is determined based on a quadratic function expressed as: duty cycle value=initial value-at.sup.2.

REFERENCES:
patent: 4527678 (1985-07-01), Pierce et al.
patent: 5085105 (1992-02-01), Wakahara et al.
patent: 5443427 (1995-08-01), Ataka et al.
patent: 5643124 (1997-07-01), Sugiyama et al.
U.S. application No. 08/764,604, Kozaki et al., filed Dec. 11, 1996.

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