Automatic transmission control system and method

Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake

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Details

743365, F16H 546

Patent

active

053822021

ABSTRACT:
An control system and method for an automatic transmission are disclosed which are adapted to shift or actuate the gears of the transmission without engine vacuum assistance. A control valve is provided which is variably positionable in response to a pressure signal from a governor to select control positions controlling the flow of hydraulic fluid to the gear shift elements of the transmission. The control valve is biased at a first select control position and is movable in response to the pressure signal from the governor to a second select control position for providing hydraulic fluid to the gear shift elements at a pressure effective for actuating the elements at a preselect vehicle speed. An adjustable position delimiter maintains the control valve at the second preselect control position.

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