Diagnostic for poorly tuned control loops

Details Diagnostic for poorly tuned control loops Diagnostic for poorly tuned control loops

G - Physics

05

B

G05B 23/00 (2006.01) G06F 17/17 (2006.01)

Patent

CA 2446633

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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