Hydraulic control device for automatic transmission

Details Hydraulic control device for automatic transmission Hydraulic control device for automatic transmission

1996-08-28

1998-09-01

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477145, 477149, F16H 6108

Patent

active

058003096

ABSTRACT:
A hydraulic control device determines whether the transmission is being shifted down, and upon determination of the shift-down action, determines whether the vehicle is in a power-on condition or in a power-off condition. Upon determination of the power-off condition, the hydraulic control device regulates the control oil pressure applied to the engaging element, such that the oil pressure is rapidly increased from the beginning of a shifting process, and is maintained at a high level until the shifting process is about to be completed. Upon determination of the power-on condition, the control device regulates the control oil pressure such that the oil pressure is maintained at a low level from the beginning of the shifting process, and is increased just before completion of the shifting process.

REFERENCES:
patent: 4933850 (1990-06-01), Wheeler
patent: 5029494 (1991-07-01), Lentz et al.
patent: 5046174 (1991-09-01), Lentz et al.
patent: 5070747 (1991-12-01), Lentz et al.
patent: 5085105 (1992-02-01), Wakahara et al.
patent: 5092199 (1992-03-01), Goto et al.

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