粮食干燥温湿度模糊免疫PID控制器

Fuzzy Immune PID Controller for Drying-Grain Temperature and Humidity

针对粮食干燥过程中温湿度变化的非线性和强耦合现象,应用免疫反馈机理和模糊控制理论,设计了一种两级结构的干燥过程温湿度模糊免疫PID控制器,前级采用补偿模糊解耦算法消除温湿度的耦合作用,后级采用模糊免疫PID控制算法对PID参数进行在线调节,并利用生物免疫机理调整非线性函数。通过与传统PID控制器和模糊PID控制器进行仿真比较,结果表明采用模糊免疫控制器进行控制,系统输出的超调小、动态响应好、稳定性好,控制性能好,实现了对粮食干燥过程温湿度的智能控制。

According to the nonlinear and strong coupling phenomena in temperature and humidity of drying process,using the immune feedback mechanism and fuzzy control theory,a fuzzy immune PID controller with hierarchical structure is designed.By using compensating fuzzy decoupling algorithm,the drying temperature and drying humidity are decoupled by the former structure.The fuzzy immune PID controlling algorithm is used to adjust,PID parameters online.The nonlinear function is adjusted according to the biology immune mechanism.Compared with the classic PID controller and fuzzy PID controller,the simulation result shows that the fuzzy immune PID controller has the features of smaller excess of system output,fewer response time,shorter stabilization time and better controlling efficiency.The intelligent control of temperate and humidity of drying process is realized.