超高速射出成型機射控系統之建模與增益規劃PI 控制

Modeling and Gain-Scheduling PI Injection Velocity Control of an Ultra High-Speed Plastic Injection Molding Machine

本文的目的在於研製一超高速射出成型機射速控制油壓伺服系統以及探討其數學模型與增益規劃比例─積分控制法則。為設計一工業級的實用超高速射出機，許多實際可行的規則及方法被提出來選擇該機器重要元件的規格。在提出合理的假設後，本文建立液壓伺服速度控制系統的動態模型，然後以實驗數據驗證該模型的合理性，同時以此數學模型研發固定增益PI控制器參數。由於固定增益PI控制器不能滿足超高速射出成型機的射速控制性能規格的要求，為解決此一缺失，增益規劃PI控制器被提出來改善在不同射出速度所產生之性能差異問題。實驗結果證實本文所設計之系統與方法具有可行性與有效性。

This paper aims to develop techniques for modeling and injection velocity control of an ultra high-speed plastic injection molding machine. Practical rules and guidelines are proposed to select key components of the hydraulic servo system in the machine, in order to construct an industry-level machine. After setting up reasonable assumptions, we present a mathematical model of the plastic injection velocity control system, and verify the model using experimental results. Based on the model, a fixed-gain PI controller is presented and tested on the presented machine. To improve the fixed-gain proportional-integrating (PI) controller, a simple gain-scheduling PI controller is employed. Through experimental results, the proposed gain-scheduling PI controller together with the system prototype produced for this paper has been proven effective and practical in achieving satisfactory velocity tracking performance.