Process control device

Details Process control device Process control device

1990-08-30

1992-11-24

Ruggiero, Joseph

Boots, shoes, and leggings

318561, 364158, 364161, 364177, G05B 1304

Patent

active

051668734

ABSTRACT:
A manipulated variable to be applied to a process and a process variable, are gathered by data gathering apparatus. In a modeling apparatus, which includes a process model, internal parameters thereof are adjusted so that an output of the process model may match the process variable. Accuracy of the process model is calculated by an estimation accuracy operating apparatus. The modeling apparatus is started when the manipulated variable or process variable changes to become larger than a fixed value, and control constants are derived from the outputs of the modeling apparatus and the estimation accuracy operating apparatus. The gain constant of the process model is determined by the output of the process model and the process variable. The internal parameters are searched by a simplex method wherein the length of the component side which comprises an initial polygon is made longer than the sampling period of the data gathering apparatus and a simplex is remade at least once at the original coordinates when the parameters are settled by a one time simplex method. At the beginning of control a step like manipulated variable is applied to the process, and based on the response to the process variable at this time, initial values of a sampling period and control constants are obtained.

REFERENCES:
patent: 3601588 (1971-08-01), Bristol, II
patent: 3767900 (1973-10-01), Chao et al.
patent: 3828171 (1974-08-01), Griffin
patent: 4195337 (1980-03-01), Bertrand et al.
patent: 4213175 (1980-07-01), Kurihara
patent: 4607325 (1986-08-01), Horn
patent: 4791548 (1988-12-01), Yoshikawa et al.
patent: 4975827 (1990-12-01), Yonezawa

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