HTF58X2注塑机螺杆筒温度的模糊PID控制

摘要

分析了HTF58X2注塑机螺杆筒温控系统的特点与要求.考虑到传统PID控制器中的螺杆筒温控系统因具有非线性、纯滞后、时变性而难以取得满意的温控效果,提出了一种基于模糊策略的PID参数在线整定的自适应控制器.该控制器根据现场输入的温度偏差和偏差变化率,通过模糊推理对PID控制器参数进行在线调整,以适应不同工况下PID参数的最佳匹配.Matlab/Simulink仿真和实验测试的结果表明,模糊-PID控制器与固定参数的PID控制器相比,在调节速度、超调量和自适应能力等方面具有一定的优势.%The characteristics and requirements of a HTF58X2 injection molding machine's screw barrel temperature control system were analyzed.Considering that traditional PID controllers' screw barrel temperature control system is difficult to obtain the satisfactory temperature control because of its features of non-linearity, pure lag and time variation, an adaptive controller using the online adjustment of PID parameters based on the fuzzy strategy was proposed.The controller can realize the on-line adjustment of its parameters by fuzzy reasoning according to the iste input temperature deviation and the variance rate of the deviation to adapt itself to the best matching of PID parameters under different working conditions.The results of the Matlab/Simulink simulation and experiment show that the fuzzy-PID controller has certain advantages in the aspects of adjusting speed, overshoot and adaptive ability in comparison with the fixed parameter PID controller.