Detection and quantification of stiction
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United States of America Patent
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Mar 27, 2012
Grant Date -
Dec 13, 2007
app pub date -
Jun 30, 2005
filing date -
Jul 2, 2004
priority date (Note) -
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Abstract
An effective non-intrusive data-based monitoring method may reduce the cost of control loop performance maintenance by screening and short-listing those control loops or valves that need maintenance. The invention comprises a data-based, model-free, non-invasive method that can automatically detect and quantify stiction present in control valves. The method does not require the implementation of any additional valve travel test or, as commonly known, bump test of the control loop. The method may detect and quantify stiction using controlled variable (pv), controller output (op) and set point (sp) data. It does not require valve positioner (mv) data.
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