3、t: Temperature is the key parameter in plastics extrusion, however, the temperature control system in plastics extruder features nonlinear and hysteresis control, which affects the response speed and stability of temperature control. A compound fuzzy proportional integral differential(PID)con
4、trol algorithm is presented to solve the drawbacks in traditional PID control algorithm, which is based on traditional PID control coupled with the advantages of fuzzy control algorithm and has been simulated by Matlab. The results show that the temperature control in extruder has high precis
5、ion by means of compound fuzzy PID control algorithm. Its regulating time is reduced by 56% compared with that of compensation PID control method. The overshoot is 0 in stable stage of the system, which implies greater stability.Keywords: plastics extruder; proportional integral differential
6、control algorithm; fuzzy control algorithm; temperature control system影响塑料挤出成型工艺的主要参数是温度、1塑料挤出机温度控制系统模型[1]压力以及挤出速率。其中,温度是影响塑料挤塑料挤出机料筒的各加热段相互连接,不同出过程的最重要因素,稳定的温度控制才能保证加热段的温度会相互传递。对于挤出机的温度控挤出产品的质量。塑料对温度敏感,挤出机温度制,PID控制算法的控制对象为各加热段的温度,控制过高,塑料原料可能会因为高温而发生局部不同加热段的控制是相互独立的。大多数挤出机热降解,影响挤出产品质量,甚至产生次品或