Shift control system for automatic power transmission with featu

Details Shift control system for automatic power transmission with featu Shift control system for automatic power transmission with featu

1989-12-26

1992-03-10

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

74866, B60K 4106

Patent

active

050941305

ABSTRACT:
A shift control system for an automatic power transmission, utilizes a logic for utilizing a shifting sequence for operating a plurality of shift solenoids for establishing valve operation in a plurality of shift valves in a predetermined order and for draining more than one speed servo pressure. The shifting sequence being a 4-2 downshift, whereby the shift solenoids are controlled such that the second speed gear ratio is shifted to via the first speed gear ratio.

REFERENCES:
patent: 4662249 (1987-05-01), Miki et al.
patent: 4730521 (1988-03-01), Hayasaki et al.
patent: 4807496 (1989-02-01), Hayasaki et al.
patent: 4856383 (1989-08-01), Rosen
patent: 4867194 (1989-09-01), Hayasaki et al.

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