Diagnostic for poorly tuned control loops
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United States of America Patent
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Mar 7, 2006
Grant Date -
May 6, 2004
app pub date -
Oct 24, 2003
filing date -
Oct 25, 2002
priority date (Note) -
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Abstract
A method and apparatus to perform an automatic diagnosis for the poor performance of a control loop, and to determine whether or not the malfunctioning is caused principally by a poor adjustment of the controller tuning parameters. The method makes use of the fact that a poorly tuned control loop amplifies disturbances in a narrow frequency range around the so-called resonant frequency. The method comprises measuring an error in a control loop over time to determine a power spectral density of the error, determining a best fit analytical function describing the power spectral density and measuring a diagnostic value from a difference between the best fit analytical function and the power spectral density of the error.
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