混合激磁式無凸輪軸引擎電磁驅動汽閥門設計與實現

Design of Electromagnetic Valve Actuator with Hybrid Magnetomotive Force for a Camless Engine

陳奕睿(Yi-Ruei Cheng)

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(2010年)

https://doi.org/10.6342/NTU.2010.00952

摘要

本論文提出一新式電磁汽閥門機構設計，目的為改善傳統內燃機引擎機械式凸輪軸汽門驅動機制下汽門正時不易調變的缺點，取而代之以螺旋線圈電磁驅動汽門，並結合具備高磁能積特性之強力永久磁鐵，設計完成包含磁鐵與電磁鐵之混合激磁式電磁閥，開發出可連續控制汽門正時和汽門開啟期間之汽門機構，以期獨立改變進排汽閥門作動策略。設計過程中藉由基礎電磁分析建立數學解析模型，透過最佳化軟體取得電磁閥最佳設計尺寸，並使用場效分析軟體分析模擬電磁閥的混合激磁磁力，最後結合電磁閥系統模擬，瞭解動態特性參數變動所帶來的影響，以及磁場影響下的系統表現，並且加入熱傳穩態模擬分析、及作動與頻域響應性能分析評估引擎能量損耗功率。相較於一般傳統電磁閥門，本研究所設計電磁閥門以模組化單體結構呈現，具備結構對稱、耐高溫環境、快速啟動且易於控制等優勢，建置引擎實驗平台雛形，經由實驗結果獲得電磁閥基本位置磁力性能、電流激磁性能與混合激磁效果，以及實際汽門作動行為，同時設計使用符合電磁閥門使用之磁感應式位置感測器，進行電磁閥定電流開迴路作動實驗，未來可進一步探討引擎加入電磁閥汽門正時控制系統後，對於引擎性能的提升。

關鍵字

電磁閥 ； 無凸輪軸引擎 ； 可變汽門正時

並列摘要

This thesis proposes a novel design for a dedicated electromechanical valve actuator system (EMVA) to improve the fix timing (phasing) and duration of the conventional valvetrain. The alternative way uses hybrid magneto-motive force EMVA exerted by solenoids and rare earth magnets to drive the intake valve independently for achieving variable valve timing (VVT) and meet with engine specifications. The design procedures are depicted in the order of establishing mathematical models by the magnetic circuit rule and refining the EMV’s dimensions with optimization software, and are verified by FEA. In addition, the heat transfer analysis and dynamic behavior were established by a simulation model to calculate the EMV’s power loss rate. In contrast with traditional EMV designs, the proposed type is an equipped individual module capable of fast response, high temperature tolerance, variable current actuating timing and easy for control. Finally, the performance of magnetic holding force by variable exertion current was measured with an experimental setup. The valve transition experiment was realized by position feedback with a magnetic position sensor design. In the future, ICE engines will exhibit improved performance by being equipped with an EMV control system.

並列關鍵字

electromagnetic actuator ； camless engine ； EMVA ； hybrid MMF

參考文獻

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