Data processing: generic control systems or specific application – Specific application – apparatus or process – Product assembly or manufacturing
Reexamination Certificate
2006-03-07
2006-03-07
Picard, Leo (Department: 2125)
Data processing: generic control systems or specific application
Specific application, apparatus or process
Product assembly or manufacturing
C700S080000, C700S081000, C700S110000, C700S174000
Reexamination Certificate
active
07010376
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.
REFERENCES:
patent: 4885676 (1989-12-01), Zweighaft
patent: 5249119 (1993-09-01), Kaseda et al.
patent: 5784273 (1998-07-01), Madhavan
patent: 5796606 (1998-08-01), Spring
patent: 5838561 (1998-11-01), Owen
patent: 6208497 (2001-03-01), Seale et al.
patent: 6298454 (2001-10-01), Schleiss et al.
patent: 2002/0077711 (2002-06-01), Nixon et al.
patent: 2003/0040818 (2003-02-01), Pletner et al.
patent: WO/98/12611 (1998-03-01), None
Thomas J. Harris, “Assessment of control loop performance”,The Canadian Journal of Chemical Engineering, vol. 67, pp 856-861, Oct. 1989.
Alexander Horch et al.,“Diagnosis and characterization of oscillations in process control loops”, pp 161-165, 2000.
Ettaleb Lahoucine
Roche Alain André
Masinick Michael D.
Ogilvy Renault LLP
Picard Leo
Pulp and Paper Research Institute of Canada
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