Method and apparatus for controlling the valve position of a variable orifice flow meter
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United States of America Patent
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Issued Date -
Jan 18, 2007
app pub date -
Jul 12, 2005
filing date -
Jul 12, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A device for metering fluid flow is disclosed. The device includes a variable sized orifice defined by a fluid flow conduit and an element movable relative to the fluid flow conduit to vary a size of the orifice, a pressure sensor configured to determine a pressure differential across the orifice and generate a pressure signal, a positioning device configured to determine a position of the element relative to the conduit and generate a position signal, and a processor configured to determine the fluid flow rate using the pressure signal and the position signal. The system can directly control the adjustable valve or orifice. Alternatively, the system can move back and forth between a direct mode and a PID mode. When in a PID mode, the system employs a standard PID algorithm with a variable gain term. The system switches to direct mode when it is advantageous for the controller to directly change the valve position based upon the setpoint, and the input and output pressures.
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