闭环分段PID恒高温控制系统设计

The Design of Closed-Loop Piecewise PID Constant High Temperature Control System

摘要: 针对温度控制非线性、大惯性、大滞后等问题，建立一种闭环分段式PID模型，首先将温度的上升阶段分为上升区间、震荡区间及稳定区间。应用MATLAB中的Simulink模块搭建闭环分段PID模型，通过试验改变其比例、积分、微分系数，使系统输出更加完善。最后，通过结合加热模块、温度控制模块及显示模块电路并应用Proteus软件进行仿真，结果表明，所选择参数能够使系统在恒定的温度下稳定，并且误差较小。

Abstract: A closed-loop segmented PID model is established to solve the nonlinear, large inertia and large lag problems of temperature control. Firstly, the rising stage of temperature is divided into the rising stage, the oscillation stage and the stable stage. Using Simulink module of MATLAB to build the closed-loop segmented PID model, and changing its proportion, integral and differential coefficients through experiments, the system output is more perfect. Finally, through the combination of heating module, temperature control module and display module circuit and the application of Proteus Software simulation, the results show that the selected parameters can make the system stable at a constant temperature, and the error is small.