基于增量式PID算法的香精施加系统设计
Flavoring system design based on incremental PID algorithm
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摘要: 为解决加热不燃烧烟草制品生产过程中香精施加量无法根据薄片质量变化进行实时调控的问题,设计了一种基于增量式PID算法的香精施加系统。该系统由称重单元、螺杆泵、喷嘴、流量传感器等组成,通过称重单元实时获取薄片质量数据,根据理论计算模型确定香精施加量,基于增量式PID算法驱动螺杆泵定量输出香精至喷嘴中,利用流量传感器对香精施加量实时反馈,实现香精精准施加。验证结果表明,当薄片质量发生变化时,香精施加量可快速调整,最大超调量为1 %,最长调整时间为1.8 s,系统具有较好的跟踪性能;施加量检测值与理论值的偏移率为0.23 %~0.52 %,施加量组内波动为3.11 %~4.17 %,系统可实现香精的准确、均匀、稳定施加。Abstract: In order to solve the problem that the spray weight could not be adjusted and controlled according to the weight change of the tobacco sheet during the manufacturing process of heat-not-burn tobacco product in real time, a flavoring system was designed based on incremental PID algorithm. The flavoring system was composed of weighing unit, screw pumps, nozzles, and flow sensors. The weight of the tobacco sheet roll was obtained through the weighing unit in real time, then the spray weight was calculated according to the theoretical calculation model, and the screw pumps were driven to output target flow to the nozzles based on incremental PID algorithm, the real-time spray weight was got from the flow sensors, and at last tobacco flavor was sprayed on the tobacco sheet. The results showed that the spray weight could be adjusted and controlled according to the weight change of the tobacco sheet in real time, the maximum overshoot of the flavoring system was 1 %, and the maximum adjustment time was 1.8 s, the system had good tracking performance. The deviation ratio of the spray weight was 0.23 %~0.52 % between the detection value and the theoretical value, the variation of the spray weight within samples was 3.11 %~4.17 %. It showed that the flavoring system could realize accurate, uniform and stable application.
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