System and method to avoid oscillatory behavior in...

Details System and method to avoid oscillatory behavior in... System and method to avoid oscillatory behavior in...

2007-11-21

2010-10-05

Vincent, David R (Department: 2129)

Data processing: artificial intelligence

Knowledge processing system

Knowledge representation and reasoning technique

C706S001000, C706S008000, C700S042000, C700S050000

Reexamination Certificate

active

07809668

ABSTRACT:
An instability avoidance module that can be implemented in SISO PID control loops to automatically adjust the controller's tuning parameters when undesired oscillatory behavior is monitored. This module is a Fuzzy-based Supervisor composed of a dynamic parameter identification module that operates on-line, and a Fuzzy Inference System (FIS) with fuzzy rules to modify PID tuning. Tests in nonlinear process models were performed, demonstrating that this Fuzzy Supervisor—Type 1 (non-intrusive) provides the PID controller the ability to adapt its tuning to eliminate the observed oscillatory behavior.

REFERENCES:
patent: 5714831 (1998-02-01), Walker et al.
patent: 6937908 (2005-08-01), Chang et al.
patent: 2003/0067355 (2003-04-01), Wojsznis et al.
patent: 2009/0143871 (2009-06-01), Gao et al.

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