注塑机料筒温度的模糊变系数PID控制

The Control of Barrel Temperature based on Fuzzy Variety-Parameter PID

注塑机料筒温度是注塑工艺的重要参数,对料筒温度进行有效地控制是保证塑料制品成型质量的重要环节。料筒温度系统是一个多变量、离散、间歇工作、大滞后、非线性、强耦合且需要人工参与的复杂系统。采用模糊变系数PID控制,用模糊规则对模糊变系数PID算法中的系数进行在线修正。结果表明该算法提高了温度控制系统的鲁棒性,超调减小,提高了注塑机料筒温度控制的精度。

Effective control of barrel temperature is the key process for ensuring the quality of product.The injection molding machine system is a multivariable,scatter,non-linear,strong-coupling and time-lag one.Parameter of the fuzzy variety-parameter PID control is corrected online by fuzzy control rules.The simulation results show that the system robustness can be improved,over shoot can be decreased.