Self-tuning controller

Details Self-tuning controller Self-tuning controller

1990-07-16

1996-12-24

Envall, Jr., Roy N.

Boots, shoes, and leggings

364158, 364159, 364162, G05B 1302

Patent

active

055878962

ABSTRACT:
An apparatus and method for automatically adjusting the control parameters of a self-tuning controller used to regulate a process having a measured process variable signal. Using the measured process variable signal, an error signal representing a closed-loop response of the process to an upset condition is generated. Local extrema of the error signal is measured and three successive amplitude values are selected to produce measured decay and overshoot characteristics of the error signal. The three successive amplitude values are selected such that the measured decay characteristic is greater than the overshoot characteristic. Based on the measured decay and overshoot characteristics at least one of the control parameters of the controller is automatically adjusted to improve the difference between one of the measured characteristics and a target characteristic.

REFERENCES:
patent: 3798426 (1974-03-01), Bristol, II
patent: 4602236 (1986-07-01), Kraus
patent: 4855897 (1989-08-01), Shinskey
patent: 4864490 (1989-09-01), Nomoto et al.
patent: 4903192 (1990-02-01), Saito et al.
patent: 5043862 (1991-08-01), Takahashi et al.
patent: 5153807 (1992-10-01), Saito
F. Radke: Microprocessor-Based Adaptive PID-Controllers, ISA Transactions vol. 27, No. 2 (1988) pp. 43-50.
Mauricio Alves da Silva, et al., A Rule Based Procedure for Selftuning PID Controllers, Proc. 27th IEEE Conf. on Decision and Control vol. 313 Dec. 1988, pp. 1947-1951.

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