Control method applied to threshing and redrying production line

Abstract

The invention relates to a control method applied to a threshing and redrying production line, providing a predictive PI controller based on a model. The control method is composed of a PI control item and a predictive control item. Based on a flue-curing barn temperature object, four flue-curing barn temperature controllers are designed by an advanced predictive PI control algorithm, thus avoiding the problems of low regulation speed and big fluctuation of the traditional PID control algorithm; based on a cooling room generalized moisture object and an outlet generalized moisture object, thecooling room moisture control scheme and the outlet moisture control scheme are respectively designed by adopting self-adaption anti-interference pseudo prediction PI control algorithm, thereby greatly improving control precision and enterprise economic benefit. The invention has the advantages that the control method is a control algorithm based on the model, and the PI control item can improve controller robustness; the predictive control item can predict future control function according to the control function in a certain past period, eliminating control blindness, and ensuring that the production is totally in autocontrol in the closed loop mode.

Description

technical field [0001] The invention belongs to the technical field of process control, in particular to a control method applied to a leaf threshing and redrying production line. Background technique [0002] The main purpose of tobacco redrying is to treat the tobacco leaves after threshing and separation, so that the moisture and temperature of the leaves can reach the specified technological indicators. Tobacco rebaking production line is mainly divided into drying section, cooling section and moisture regaining section according to the process characteristics. The drying section is divided into four zones, the cooling section is divided into one zone, and the moisture regaining section has two zones. [0003] Compared with other processes in the process industry, the redrying process of tobacco leaves has its obvious characteristics, which is a process with multiple disturbances, strong coupling, large lag, nonlinearity, and uncertainty with large heat capacity. Change...

AI Technical Summary

Problems solved by technology

Changes in temperature and humidity in any section of different processes will affect the changes in the parameters of each section and the moisture content of the exported tobacco leaves, which makes the establishment of the system's mechanism model quite complicated.

Therefore, it is difficult to achieve the purpose of closed-loop automatic control by using a simple PID control algorithm for the outlet moisture in the rebaking process, let alone guarantee the control accuracy

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