Control system for automatic transmission using torque converter

Details Control system for automatic transmission using torque converter Control system for automatic transmission using torque converter

1992-08-20

1995-02-28

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477147, F16H 6106, F16H 6108

Patent

active

053932790

ABSTRACT:
An automatic transmission shift control system includes a hydraulically controlled valve mechanism for connecting and disconnecting a supply of hydraulic pressure to frictional coupling elements. Connection and disconnection of the hydraulic pressure supply locks and unlocks the frictional coupling elements in order to automatically shift an automatic transmission into desired gears. A time regulator regulates a duration time for which the valve mechanism is kept actuated and with which a speed at which the frictional coupling element is locked changes. The time regulator is controlled so as to variably regulate the duration time according to conversion efficiency of a torque converter. This conversion efficiency is, for example, determined from a speed conversion ratio and a torque conversion ratio.

REFERENCES:
patent: 4671139 (1987-06-01), Downs et al.
patent: 4709596 (1987-12-01), Boda et al.
patent: 4753135 (1988-06-01), Sotoyama et al.
patent: 4845618 (1989-07-01), Narita
patent: 4953090 (1990-08-01), Narita
patent: 5079972 (1992-01-01), Iizuka
patent: 5111717 (1992-05-01), Takeuchi et al.
patent: 5168449 (1992-12-01), Benford

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