Digital variable actuation system

Details Digital variable actuation system Digital variable actuation system

1996-11-27

1998-04-14

Nguyen, Hoang

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

91459, F15B 1316, F15B 13044

Patent

active

057379947

ABSTRACT:
This invention pertains to a hydrostatic actuation system based on a digitally commutated, piston pump. Typically the pump is a fixed displacement axial piston pump with the hydromechanical commutator (which consists of either check valves or a rotated portplate) replaced by electromagnetically activated switches. The activation of the switches coincides with the extreme position of the pistons. The actual switching events are selected by a digital controller to effect an incremental flow rate to a hydraulic actuator. The flow rate consists of minute volumes of fluid displaced at a frequency and polarity dependent on the magnitude and sign of the rate binary applied to the controller.

REFERENCES:
patent: 4759183 (1988-07-01), Kreth et al.
patent: 4813339 (1989-03-01), Uno et al.
patent: 4884402 (1989-12-01), Strenzke et al.
patent: 5542336 (1996-08-01), Larkin
patent: 5615594 (1997-04-01), Duckinghaus
SAE Technical Paper Series "The Integrated Actuation Package Approach to Primary Flight Control", Apr. 1992.

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