Automatic transmission control system

Details Automatic transmission control system Automatic transmission control system

1991-01-25

1992-02-18

Wright, Dirk

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74866, F16H 6106

Patent

active

050883577

ABSTRACT:
A hydraulic control system shifts an automatic transmission into at least a reverse range and a drive range having several forward speed gears by selectively coupling a plurality of frictional coupling elements, including a reverse coupling element. The control system includes a throttle, such as an orifice, for regulating hydraulic pressure applied to the reverse coupling element. A bypass circuit is provided in the control system for applying the hydraulic pressure, bypassing the throttle, to the reverse coupling element. The bypass circuit is opened when a specific operating condition of the automatic transmission of an engine is created, so as to apply the hydraulic pressure through the bypass circuit to the reverse coupling element to rapidly achieve a coupling of the reverse coupling element.

REFERENCES:
patent: 4722251 (1988-02-01), Sumiya et al.
patent: 4889016 (1989-12-01), Kuwayama et al.
patent: 4930080 (1990-05-01), Suzuki

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