摘要
为满足塑料制品的高精度要求,降低注塑机的使用成本与能耗要求,研究了以伺服比例阀控制注射机构的闭环控制系统,建立了考虑阀流量-压力非线性、注射油缸容积变化和塑料熔融特性的系统非线性模型,提出了适合于本系统的模糊PID控制算法。利用Matlab/Simulink平台构建了系统的仿真模型,结果验证了该闭环控制系统及控制算法的可行性与有效性,较之于传统PID控制,该控制策略使系统静差明显减小,注射速度的跟踪效果得到明显改善,有利于提高制品的重复精度。
In order to meet the high-precision request of plastic products, reduce costs and energy lost of the injection molding machine, this paper studied injection molding system of closed-loop control system controlled by a servo proportional valve, established the nonlinear model considering the valve flow-pressure non- linear, injection cylinder volume changing and the polymer melting flow characteristics, provided fuzzy PID control method fitting the system. With the Matlab/Simulink platform, established a simulate model. The result proved the feasibility and effectiveness of the closed-loop control system and control method, compared to the conventional PID control, this control strategy significantly reduced the static error of the system, greatly improved the tracking results of the injection speed, and effectively helped to improve products＇ repeat precision.
出处
《塑料工业》
CAS
CSCD
北大核心
2009年第12期26-29,共4页
China Plastics Industry
基金
国家科技支撑计划项目(2007BAF13B04)
关键词
闭环控制
伺服比例阀
注射速度
模糊PID
控制精度
Closed-loop Control
Servo Proportional Valve
Injection Speed
Fuzzy PID
Control Precision
