Equipment and method for controlling operation

Abstract

A control arithmetic device includes a subtracting section, disturbance application detecting section, error correction amount calculating section, error correction amount convergence calculating section, and control arithmetic section. The subtracting section calculates the error of a controlled variable on the basis of a controlled variable and set point for a controlled system. The disturbance application detecting section detects, in control cycles, on the basis of the error output whether a disturbance is applied. The error correction amount calculating section calculates an error correction amount on the basis of the magnitude of the error when application of a disturbance is detected. The error correction amount convergence calculating section performs a convergence operation to converge the output error correction amount from error correction amount calculating section to zero. A control arithmetic method is also presented to caculate controlled value on the basis of output error from subtracting section and output error correction value before convergence from convergence calculating section.

Description

technical field [0001] The present invention relates to a control operation device which calculates a manipulated variable (a manipulated variable) based on an error (deviation) between a set point and a controlled variable to perform, for example, PID (Proportional, Integral and Differential) Control or IMC (Internal Model Control), the present invention relates in particular to a control arithmetic device and a control arithmetic method capable of suppressing an overshoot following a disturbance. Background technique [0002] Existing devices that use PID control are generally used as general-purpose control arithmetic devices that can be used in uncertain controlled systems. Such as Figure 5 As shown, the existing PID control arithmetic device 10 includes: a host computer 11, which subtracts a controlled variable PV from an input set point SP to output an error Er; and a control arithmetic unit 12, which The control calculation unit calculates a manipulated variable MV ...

AI Technical Summary

Problems solved by technology

That is, even if the overshoot suppression function is activated when it detects that the manipulated variable PV is close to the set point SP, it is too late for effective control

As mentioned above, in the existing control calculation device, if the added disturbance causes the controlled variable PV to change rapidly, the overshoot cannot be suppressed.

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