Line pressure control during downshift

Details Line pressure control during downshift Line pressure control during downshift

1989-08-08

1991-05-14

Herrmann, Allan D.

Machine element or mechanism

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

Preselected indexed position

74867, F16H 5970, F16H 5946

Patent

active

050145762

ABSTRACT:
According to the present invention, for a downshift operation, a line pressure is decreased at an initial stage of the downshift operation, a gear ratio is derived from an input revolution speed of an automatic transmission and an output revolution speed thereof, and the line pressure is increased when the gear ratio meets a predetermined condition.

REFERENCES:
patent: 4394827 (1983-07-01), Kubo et al.
patent: 4445401 (1984-05-01), Ishimaru
patent: 4627312 (1986-12-01), Fujieda et al.
patent: 4771658 (1988-09-01), Miyawaki
patent: 4790217 (1988-12-01), Kamano et al.
patent: 4791568 (1988-12-01), Hiromatsu et al.
patent: 4796490 (1989-01-01), Butts et al.
patent: 4949595 (1990-08-01), Shimanaka
patent: 4967356 (1990-10-01), Mori

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