模糊PID在挤出机压力控制系统中的应用

Fuzzy PID in Pressure Control System for Extruders

针对双螺杆挤出机压力控制系统内参数变化的非线性特征使模型受到很大影响的问题,将模糊控制和PID结合使用,在数据输出时以数据队列规则输出,实现了对压力的恒压控制。Fuzzy+PID+数据队列控制方案在BOPET双向拉伸薄膜的应用上得到了理想的压力控制效果。

Considering the fact that close-loop control system with large time delay asks for a mathematic model before the data structure and control function blocks to be established; and non-linear characteristics of parameter changing in twin-screw extruder's pressure control system influence the model and the fuzzy control algorithm can provide stable output in non-linear large time-delay system without mathematic model,having fuzzy control and PID algorithm combined and applied to sheet and film's large D-L ratio extrusion was proposed to achieve a constant pressure control while exporting the data in queue form.