Self-monitoring tuner for feedback controller

Details Self-monitoring tuner for feedback controller Self-monitoring tuner for feedback controller

1990-10-16

1992-10-27

Smith, Jerry

Boots, shoes, and leggings

364162, G05B 1302

Patent

active

051595478

ABSTRACT:
An automatic tuner is provided for continuous, on-line tuning of proportional, integral, and derivative (PID) feedback controllers. The tuner compares the system input signals with the system response to generate estimates of system damping, frequency, and steady-state error, and then applies a set of if-then rules derived from mathematical and/or empirical analysis of the system parameters. The tuner represents each parameter of the rule-set by a "fuzzy" membership function, and an inference mechanism uses fuzzy logic for computing system outputs from the input values. The tuner also incorporates a self-monitoring mechanism to adjust the tuner output based on past performance. At each running cycle, the tuner computes a Euclidean distance between present values and desired values in the parameter-space represented by damping, frequency, and steady-state error. The output of the tuner is then scaled by a "reward factor" that is a function of the tuner effectiveness and consistency. If tuner effectiveness degrades, the self-monitoring mechanism diminishes the output of the tuner. If the tuner is operating with consistency, the self-monitoring mechanism increases the output of the tuner. Thus, the self-monitoring mechanism improves performance and robustness of the tuner by scaling the output to produce faster slew rates when the tuner is performing well and by reducing tuner output when performance is poor.

REFERENCES:
patent: 4549123 (1985-10-01), Hagglund et al.
patent: 4675805 (1987-06-01), Freymann
patent: 4860215 (1989-08-01), Seraji
patent: 4903192 (1990-02-01), Saito et al.
Anderson et al., "A Rule-Based Adaptive PID Controller," Proc. 1988 IEEE Conf. on Decision and Control, pp. 564-569, Austin, Texas, 1988.

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