Process and apparatus for the control of a process variable when

Details Process and apparatus for the control of a process variable when Process and apparatus for the control of a process variable when

1990-11-02

1993-01-12

Smith, Jerry

Boots, shoes, and leggings

364162, 364148, G05B 1302

Patent

active

051795132

ABSTRACT:
A system having a control variable, such as a proportion of a certain substance in a solution, maintains a set value of that control variable by obtaining a measuring signal as a function of the control value. That function is characterized by a curve having an extreme value dividing the curve into monotonically ascending and descending sections. The measuring signal is compared with a reference value corresponding to the set value of the control variable to obtain a different value. When the difference value lies within a predetermined range, a first signal generator is actuated to correct the deviation of the control variable. When the difference value lies outside of that range, a second signal generator is actuated to correct the deviation of the control value within a section of the curve which would be unstable if correction were instead to be made by the first signal generator.

REFERENCES:
patent: 3480765 (1969-11-01), Rouxel et al.
patent: 3515860 (1970-06-01), Fitzgerald, Jr.
patent: 4545008 (1985-10-01), Sominin et al.

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