Research And Realization On The Temperature Control Of Cell Incubator Based On Self-tuning Fuzzy PID Control

The temperature control as an essential factor to cell culture,it directly related to the best effect of cell culture.Therefore,a cell incubator with high temperature control accuracy and good temperature uniformity will have a wide range of commercial value.Presently,the control theory which mostly applied in temperature control of cell incubator is traditional PID control.It is difficult to determine traditional PID control parameters,always need to try many different on-line regulation parameters,if we designed the traditional PID control without have established the accuracy of mathematical modeling of the controlled plants,the precision,uniformity and robustness of the controller can't be guaranteed.The temperature control of cell incubator has some characteristics,for example,nonlinearity,time-lag,strongly coupling and difficult to establish accuracy mathematical model of the object.This paper designs a cell incubator temperature control system based on self-tuning fuzzy PID,which can realize the real-time on-line correction of PID parameters,And the software and hardware development of the temperature control system are analyzed in detail,the fuzzy PID control algorithm design are analyzed in detail as well.For the hardware,a temperature control system with complete function which based on the F28M35 is designed,including temperature measurement and control,power supply,communication circuit and HMI.For the object oriented modular design is adopted in the software system,it has some advantages,such as good universality,easy sharing and strong anti-interference.And the self-tuning fuzzy PID controller without establishing the mathematical model,but having the quality of dynamic response and strong adaptability,high steady-state precision.Experimental results show that the system stabilized the temperature in 2890 seconds when it rose from 26?to 37?.and the overshoot within 37± 0.05?,the stabilized temperature can stay within 37± 0.1?,and it was demonstrated on another incubator.temperature uniformity reaches ± 0.3?.The temperature regulation results show that the control algorithm better than traditional PID control of fast response,little overshoot,high precision,it can satisfy demands of temperature control of cell incubator.