Patent
Automatic adjusting method of control constant
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TLDR
In this article, a control operation device is provided with the second controlled system (process) on the lower side of the control system, and the second identifying operation part 7 identifies the transmission function of the second controlling system in accordance with a controlled variable signal ys(t) and a process variable signal xs(T) before and after them.Abstract:
PURPOSE:To adjust a control constant to an optimum value and to allow process variables on the lower side of a control system to respond with excellent stability and promptness by identifying the transmission function of a controlled system in the control system and that of the controlled system on the lower side of the control system and allowing the transmission function from a target value of a controlled variable to a process variable, whose response control is required, on the lower side of the control system to coincide with the transmission function of a reference model showing an ideal response characteristic CONSTITUTION:A control operation device is provided with the second controlled system (process) 6 on the lower side of the control system, the second identifying operation part 7 which identifies the transmission function of the second controlled system in accordance with a controlled variable signal ys(t) and a process variable signal xs(t), and the second detector 8 which detects a process variable x(t) to output the process variable signal xs(t) The first and the second controlled systems are approximated by self-regression moving average models, and G1(s) and G2(s) are identified in accordance with time series signals vs(t),ys(t), and xs(t) before and after them A control constant operation part 4 obtains the transmission function from a target value rs(t) or y(t) to the process variable x(t) and obtains the optimum control constant on a basis of an operation formula so that this transmission function coincides with a transmission function Gm(sigma, s) of the reference model showing the ideal response characteristic, and the control constant of a control operation device 2 is corrected Thus, the control constant by which the process variable in the lower side of the control system responds ideally is obtained easily without feeding back this process variable to the control systemread more
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