基于PLC的模糊PID控制器在热风干燥箱上的应用  

Fuzzy PID controller based on PLC and application on hot air drying chamber

作　　者：王磐[1] 洪苑乾[1] 黄汉英[1] 胡月来[1] 聂少伍 赵思明[2] 

机构地区：[1]华中农业大学工学院,湖北武汉430070 [2]华中农业大学食品科技学院,湖北武汉430070

出　　处：《食品与机械》2016年第12期100-104,共5页Food and Machinery

基　　金：现代农业技术体系建设专项基金(编号:CARS-46-23)

摘　　要：针对热风干燥过程中温、湿度变化的非线性和大滞后现象,系统采用了模糊控制与常规PID控制相结合的方法,利用模糊PID控制原理,设计了模糊PID控制器,实现了PID参数在PID控制系统中的在线自整定。试验结果表明:在目标温度设定为15℃时,与常规PID控制相比,基于模糊PID控制的热风干燥控制系统最大超调量下降了3℃,调节时间减少了10min,稳态误差为±0.5℃,具有更好的动态和静态响应特性,在参数改变的情况下更能适应热风干燥箱的工程应用需求。According to the non-linearity and large-lag phenomena in temperature and humidity in hot air drying process,conventional PID control and fuzzy control were combined using fuzzy PID control theory in the system.A Fuzzy PID controller was designed to achieve the PID parameters＇ online self-tuning.Results：when the target temperature is set at 15℃,compared with the conventional PID control,the maximum overshoot of the hot air drying control system based on fuzzy PID control is decreased by 3℃,the adjustment time is reduced by 10 min and the steady state error is ± 0.5 ℃,with better dynamic and static response characteristics,and in the case of parameter changes can better adapt to the hot air drying oven engineering applications.

关 键 词：模糊PID PLC 热风干燥 MATLAB 参数自整定 

分 类 号：TB4[一般工业技术] TP273[自动化与计算机技术—检测技术与自动化装置]