Tobacco Science & Technology, 2012, 4, p. 16-19, ISSN.1002-0861

An identification-free self-adaptive control scheme for tobacco casing and flavoring processes

CAO Qi(1); HE Shanjun(2); LIN Miaoqiao(1); MA Qingwen(1); LIN Tianqin(1)
(1) Longyan Tobacco Industrial Co., Ltd., Longyan 364000, Fujian, P.R. China; (2) Xiamen Tobacco Industrial Co., Ltd., Xiamen 361026, Fujian, P.R. China

The traditional PID control in tobacco casing and flavoring systems cannot respond to significant tobacco flow variations steadily and accurately, which results in uneven casing and flavoring distribution in processed cut tobacco. Therefore, an identification-free self-adaptive control scheme was proposed, whose control algorithm was simple and easy to be realized in engineering. The controller parameters could be online corrected and its control performance could be optimized automatically in response to the fluctuation of tobacco flow to realize fast regulation and accurate control. The results of application showed that comparing with traditional PID control, the standard deviation of instantaneous application ratio decreased from 0.05 to about 0.01 and maximum control error reduced from above 0.3 to less than 0.1. The control system featured good robust stability which could guarantee the accurate and even casing and flavoring, and the control level of primary processing was improved.