本文主要探討電磁比例方向閥於塑膠射出成形機射出速度控制的研究。射出成形機的機台是參加「九十一學年精密機電設計科技教育改進計畫全國學生專題競賽」時所製作的作品:「桌上型塑膠射出成形機之設計與製作」，小型化的目的是方便作為學校教學研究或產業界訓綀使用，因此以低成本來設計機器是很重要的考量因素。由於在一般產業中使用比閥例閥即可達成控制需求，且製造與維護的成本皆比伺服閥便宜，所以選擇比例閥作為研究的受控元件。本文以自調整模糊控制為架構，與傳統的模糊控制做比較。由電腦模擬與實驗的結果發現，自調整糢糊控制的結果優於傳統模糊控制。

This paper presents the velocity of a plastic injection molding machine equipped with a proportional directional valve. Compared with servo valves used in industry, proportional directional valves not only meet educational and training purposes but also reduces the cost of maintenance. The plastic injection molding machine was designed and fabricated in the type of desktop. Via miniaturei- zation, the machine could be efficiently used in educational systems and skill-training departments. Moreover, it reduces the manufacturing expenses to a minimum.
To deal with velocity control, this paper proposed the self-tuning fuzzy controller, which can adjust the fuzzy parameters adaptively. The simulated and experimental results show that the proposed self-tuning fuzzy controller outperforms the conventional fuzzy controller.

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