無凸輪軸引擎電磁式汽門機構設計與製作

Design and Fabrication of Electromechanical Valve Actuation Mechanism for Camless Engine

徐家鴻(Jia-Hong Xu)

指導教授 ： 陽毅平

國立臺灣大學/工學院/機械工程學研究所/碩士(2007年)

https://doi.org/10.6342/NTU.2007.01379

摘要

發展高效率、低污染動力系統之關鍵技術，已是內燃機引擎的重要目標，然而可變汽門正時機制，對於改善引擎性能，為有效且必要之手段。電磁式汽門機構使用電磁螺線管式驅動汽門，免除凸輪軸，各汽門可獨立控制。本文的研究主題為利用高磁能積永磁與線圈激磁之混合磁動勢，結合低電功率之概念，開發出新型電磁式汽門機構來達到性能需求。研究中首先評估引擎操作上的限制，制訂電磁式汽門動力需求，藉由電磁分析建立數學模型，透過最佳化軟體達到最佳設計，經由有限元素分析軟體驗證，完成電磁式汽門系統雛型建構，並且加入熱傳暫態與穩態模擬分析、振動模態分析、及運動與頻域響應性能分析。本研究的具體貢獻包括，新型電磁式汽門機構雛型輕量化、結構簡單、耐高溫環境、無需起始電流、改善電流制動時機、高速響應以及易於控制等優勢。最後經由實驗結果可獲知感測器回授訊號擁有高線性度，未來加入汽門正時控制系統後，將大幅提升引擎性能。

關鍵字

無凸輪引擎 ； 電磁式汽門 ； 混合磁動勢 ； 雙通道平行磁路

並列摘要

For the sake of the environmental consciousness rising, it is necessary to improve internal combustion engine for high efficiency. Electromechanical valve actuator system (EMVA) uses solenoid to drive each valve independently for achieving variable valve timing (VVT). The main issues of the present research (EMVA) aims to the lower power source needed and hybrid magneto-motive force (MMF) usage. The design procedures depicted in the order as: establish mathematical model via magnetic circuit, optimization, and verified by FEA. The proposed prototype shows a lot of advantages comparing with conventional EMV as following: compact, high temperature tolerance, fast response, no starting current, different current actuating timing and easy for control. It is expected to accomplish VVT in the future achievements.

並列關鍵字

camless engine ； electromechanical valve actuator ； hybrid MMF ； dual-channel parallel polarized method

參考文獻

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