Self-tuning controller

Details Self-tuning controller Self-tuning controller

1988-03-03

1989-11-14

MacDonald, Allen

Boots, shoes, and leggings

364157, G05B 1300

Patent

active

048811602

ABSTRACT:
A controller in which proportional integral (PI) arithmetic is effected on a deviation between a measurement or process signal from a process or controlled system and a control set value, and a resultant manipulation signal is outputted to the process. A waveform of the process signal or the deviation signal is observed. PI arithmetic parameters undergo self-tuning so that the measurement result becomes a preset response target. In the preferred embodiment, means are provided for performing self-tuning on the PI arithmetic parameters including waveform observing means for using an area ratio of a first area to a second area as one of the evaluation indexes which represent patterns of the measured waveforms, the ratio being associated with the process signal or the deviation signal extending from a first generation timing of a first peak of the process signal or the deviation signal, to a subsequent second generation timing of a second peak, the second area being associated with the process signal or the deviation signal extending from the second generation timing to a timing given by second timing+(second timing - first timing).

REFERENCES:
patent: 4441151 (1984-04-01), Hayashibe
patent: 4602326 (1986-07-01), Kraus
patent: 4754391 (1988-06-01), Suzuki
patent: 4768143 (1988-08-01), Lane et al.

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