Adaptive control for automatic transmission engagement

Details Adaptive control for automatic transmission engagement Adaptive control for automatic transmission engagement

1995-06-06

1996-05-28

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

475131, F16H 6106

Patent

active

055205860

ABSTRACT:
A system for controlling engagement of forward drive and reverse drive when a gear selector lever is moved from park or neutral position and for adapting the control on the basis of the slip across the oncoming friction element includes an automatic transmission, gearing friction elements that control the gearing, a valve body containing shift valve solenoids for operating the shift valves and control algorithms executed by a microprocessor, a gear selector lever, a throttle position sensor, shaft speed sensors, and transmission input and output shafts. The clutch pressure increases linearly under the control of a closed-loop system. A control algorithm senses when the closed-loop control is operative and automatically changes the period during which clutch pressure is maintained at a high magnitude prior to engagement so that the resulting gear change is smooth and occurs at maximum speed.

REFERENCES:
patent: 4527678 (1985-07-01), Pierce et al.
patent: 4970916 (1990-11-01), Narita
patent: 5046178 (1991-09-01), Hibner et al.
patent: 5249483 (1993-10-01), Iizuka
patent: 5385511 (1995-01-01), Iizuka

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