Motors: expansible chamber type – Working member position feedback to motive fluid control – With means to vary feedback signal in response to rate of...
Patent
1978-06-07
1980-05-13
Maslousky, Paul E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
With means to vary feedback signal in response to rate of...
91459, 91461, F15B 1316, F15B 13044
Patent
active
042022479
ABSTRACT:
Two embodiments of closed loop electro-fluidic controlled systems are disclosed for controlling the velocity, acceleration, torque, force of 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 regulate 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.
REFERENCES:
patent: 2797666 (1957-07-01), Chubbuck
patent: 2939430 (1960-06-01), Westbury
patent: 3257914 (1966-06-01), Thorner
patent: 3386343 (1968-06-01), Gray
Hunkar Denes B.
Ortlepp Hans
Hunkar Laboratories, Inc.
Maslousky Paul E.
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