Lead-lag filter arrangement for electro-pneumatic control loops
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United States of America Patent
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Mar 29, 2011
Grant Date -
Dec 31, 2009
app pub date -
Sep 9, 2009
filing date -
Oct 20, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A lead-lag input filter is connected ahead of a positioner feedback loop having one or more valve accessories, such as a volume booster or a QEV, to overcome slow dynamics experienced by the accessories when receiving low amplitude change control or set point signals. A user interface is connected to the lead-lag input filter and enables an operator or other control personnel to view and change the operating characteristics of the lead-lag input filter to thereby provide the control loop with any of a number of desired response characteristics.
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