G - Physics – 05 – D
Patent
G - Physics
05
D
341/88
G05D 13/62 (2006.01) F15B 9/03 (2006.01)
Patent
CA 1078943
CLOSED LOOP ELECTRO-FLUIDIC CONTROL SYSTEM Abstract of the Disclosure Two embodiments of closed loop electro-fluidic con- trolled systems are disclosed for controlling the velocity, acceleration, torque, force or pressure applied to a member. The system includes a source of electrical command signals correlated- to the desired magnitude of the parameter being controlled, a transducer responsive to the controlled member for providing an electrical feedback signal correlated to the actual value of the parameter, and a circuit for providing an error signal correlated in magnitude and polarity to the magnitude and sense of the difference between the actual and desired values of the controlled parameter. Also included is a transducer responsive to the error signal for applying a positioning force to a movable valve closure element, which is subjected to no other forces, to regu- late the application of pressurized fluid through the valve to the controlled member in dependence upon the error signal. No feedback, mechanical, fluidic or otherwise, exists between the valve element and the transducer which positions it. An important advantage of the system is that the error signal is zero under steady state conditions when the actual and desired magnitude of the controlled parameter are equal nonzero values. In addition, electrical command offset signals and/or electrical integrators operating on the error signal and/or centering springs operating on the movable valve element are not required. Nor is feedback required between the movable valve element and the transducer which positions it.
272900
Hunkar Denes B.
Ortlepp Hans
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