基于模型参考模糊自适应PID的高压釜温度控制

摘要

通过对某厂生产复合玻璃的关键过程"合片抽真空"的研究,发现该过程中应用的温度控制方法简单,但控制效果不理想,会产生超调、震荡等现象.为了改善生产过程中的温度控制效果,对高压釜的升温状况以及控制方法进行了研究.以模型参考模糊自适应控制为基础,设计了一种控制效果更精确的温度控制方式.首先,对高压釜釜内温度进行温度建模,对高压釜的温度模型进行机理分析,得出其温度模型,并进行阶跃响应试验,将采集到的数据通过飞升曲线方法获得温度模型的模型参数.其次,以温度模型为理论依据,通过模型参考模糊自适应控制方式对PID参数进行在线调整,弥补PID参数不能在线整定的缺点.最后,通过仿真试验,验证了该控制方案能有效减少超调,加快反应速度.结果表明,该控制方式可以有效改善控制效果,提高产品的生产质量.%Based on the investigation of the critical process of "laminating and vacuuming" for composite glass,it is found that the temperature control method is too simple and the control effect is not good,so the overshoot and oscillation may occur.To improve the effect of temperature control,the heating up condition the temperature of the autoclave and the control method are researched.With the model reference fuzzy adaptive system (MRAS) control as the basis,the temperature control mode offering more accurate control effect is designed.Firstly,modeling of the temperature inside autoclave is setup,and the mechanism analysis of the temperature model is conducted,to obtain its temperature model.The step response is tested;from the data collected,the parameters of model are obtained through the soaring curve method.Secondly,with the temperature model as the theoretical basis,the PID parameters are adjusted online through MRAS control mode to overcome the disadvantage of PID parameters cannot be adjusted online.Finally,through simulation test,the effectiveness of this control scheme for reducing the overshoot and faster the response speed is verified.The result shows that this control method effectively improves the control effect,and enhances the quality of products.