Control apparatus having a limit cycle auto-tuning function

Details Control apparatus having a limit cycle auto-tuning function Control apparatus having a limit cycle auto-tuning function

2005-10-25

2005-10-25

Knight, Anthony (Department: 2121)

Data processing: generic control systems or specific application

Generic control system, apparatus or process

Optimization or adaptive control

C700S037000, C700S046000, C700S055000, C702S084000, C708S303000, C708S322000, C318S561000

Reexamination Certificate

active

06959219

ABSTRACT:
A control apparatus includes a manipulated variable output unit, calculation unit, first lower limit setting unit, first upper limit setting unit, second lower limit setting unit, second upper limit setting unit, and controlling element. The manipulated variable output unit outputs first and second manipulated variables to an object to be controlled. The calculation unit calculates a limit cycle auto-tuning control parameter. The controlling element performs feedback control calculation based on the control parameter for the deviation between a set point and a controlled variable to calculate the first manipulated variable, and outputs the calculated first manipulated variable to the object. In executing limit cycle auto-tuning, the calculation unit outputs to the object the second manipulated variable having the second lower limit value as the lower limit value and the second upper limit value as the upper limit value, calculates the control parameter of the controlling element on the basis of a control response corresponding to the manipulated variable output, and sets the calculated control parameter in the controlling element.

REFERENCES:
patent: 4768066 (1988-08-01), Ito
patent: 5059880 (1991-10-01), Hiroi
patent: 05313702 (1993-11-01), None
Hiroi, “Fundamentals and Applications of Digital Instrumentation Control System”, Kogyougijutsusha, ISBN4-905957-00-1, pp. 156-159, Oct. 1987.

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