Gear shift control system for automatic transmission

Details Gear shift control system for automatic transmission Gear shift control system for automatic transmission

1993-11-26

1997-09-02

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477155, F16H 5900

Patent

active

056625510

ABSTRACT:
An automatic transmission gear shift control system controls a transitional pressure level during a gear shift according to engine output conditions and correctively changes a rate at which the transitional pressure changes according to a time difference between an actual gear shift time and a target gear shift time when an engine output is less than a specified level. If the corrected rate is greater than a specified rate, then the transitional pressure level is increased. According to the control system, even when a drop in the transitional pressure does not cause a change in shifting time, a shifting time learning control is properly conducted.

REFERENCES:
patent: 4981053 (1991-01-01), Yamaguchi
patent: 5063814 (1991-11-01), Baba et al.
patent: 5133230 (1992-07-01), Ito et al.

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