基于串级控制的PLC加热炉温的设计

Design of PLC Heating Temperature Based on Series Level Control

首先就串级控制系统,给出了衡量控制系统工作优劣的性能指标确定算法策略,设计了PLC闭环控制系统的PID数学模型mν(t)=Kp[eν(t)+1/n∫eν(t)dt+TDdeν(t)/dt]+M,在提出炉温控制方案的算法设计基础上,对炉温控制系统进行了硬件设计和温度控制程序的设计,最后以45钢零件进行等温球化退火为例,分析炉温控制系统的具体应用。结果表明:热处理炉温度控制系统的设计是成功的。

The closed ring control system of PID with PLC was designed, mathematics model is rag（t）= Kp [ ev（t）＋ 1/n∫ev （t）dt＋TDdev（t）/dt]＋M. The heating-furnace temperature controlling system and program were designed by good man-machine interface. Then taking spheroidization of 45 steel as object, the application of common heating furnace temperature control system was analyzed.The results show that the design of heating furnace temperature control system is successful.