Speed change control system for automatic transmission

Details Speed change control system for automatic transmission Speed change control system for automatic transmission

1997-04-23

1998-12-01

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

F16H 6100

Patent

active

058429514

ABSTRACT:
A speed change control system for an automatic transmission for making a speed change of the automatic transmission by applying/releasing frictional engagement elements and for controlling a line pressure, to be fed to the frictional engagement elements, to a pressure according to a throttle opening. The speed change control system detects a downshift of the automatic transmission with the throttle opening being increased, to control the line pressure to a level lower than that according to the throttle opening, if the downshift is detected. As a result, the torque transmission capacities of the frictional engagement elements, even if they are of the hydraulic type in which they are applied at the downshift, can be preventing from increasing during the speed change, thereby to improve the shift shock at the downshift.

REFERENCES:
patent: 4796490 (1989-01-01), Butts et al.
patent: 5029494 (1991-07-01), Lentz et al
patent: 5085105 (1992-02-01), Wakahara et al.

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