研究生: |
李群文 CHUN-WEN Li |
---|---|
論文名稱: |
以排氣背壓閥實現汽油均質進氣壓燃增程發電引擎之閉迴路燃燒時間點控制 Using Exhaust Throttle to Implement Closed-loop Control of Combustion Timing in a Gasoline HCCI Range Extending Engine |
指導教授: |
姜嘉瑞
Chia-Jui Chiang |
口試委員: |
呂百修
none 陳亮光 Liang-Kuang Chen 盧昭暉 none 吳浴沂 none |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2014 |
畢業學年度: | 102 |
語文別: | 中文 |
論文頁數: | 221 |
中文關鍵詞: | 汽油均質進氣壓燃引擎 、燃燒熱釋放 、燃燒時間點 、排氣背壓閥 、比例-積分控制 |
外文關鍵詞: | HCCI, Heat Release, Combustion Timing, Exhaust Throttle, PI controller |
相關次數: | 點閱:529 下載:4 |
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均質進氣壓燃引擎有著高效率及低NOx排放之優點,但均質進氣壓燃引擎點火時間受到油氣混合物濃度、
汽缸內部溫度及壓力影響,不像一般汽油引擎及柴油引擎,其點火時間可透過火星塞跳火時間及噴油時間來決定,因此控制均質進氣壓燃引擎之自燃時間點控制便成為主要的挑戰。本研究採用華擎機械工業股份有限公司所開發之500c.c單缸引擎,更換活塞增高壓縮比並加裝進氣加熱系統以利均質進氣壓燃燃燒模式之進行。燃燒時間點之控制則藉由排氣背壓閥(Exhaust Throttle)達成殘留氣體比例之調變。
本研究首先進行一系列的穩態實驗以決定適當之均質進氣壓燃模式之操作點。透過XPC的燃燒熱釋放模型進行即時運算,算出引擎燃燒50%之時間點(CA50)並回授至Mototron ECU進行閉迴路燃燒時間點控制。閉迴路控制系統乃以比例-積分控制為基礎。最後,我們以噴油量步階變化作為干擾,以檢驗此閉迴路控制系統抑制干擾之性能。
Homogeneous Charge Compression Ignition (HCCI) engines have received significant attention in recent years due to their high efficiencies and extremely low NOx emissions.However, unlike the conventional engines, the combustion timing of HCCI engines depends on the cylinder mixture conditions such as temperature, pressure and compositions.Therefore, regulation of combustion timing becomes a critical challenge for the success of HCCI engines.In this study, a single-cylinder 500c.c.engine developed by China Engine Corporation (CEC) is modified by replacing the piston for a higher compression ratio and adding an intake heating system to facilitate the HCCI combustion.An exhaust throttle is also implemented to control the HCCI combustion timing via regulation of the residual gas fraction inside the cylinder.A series of steady-state experiments are conducted to select proper HCCI operating condition.The combustion timing when 50%$ of the fuel is burned (CA50) is estimated real time in the Matlab XPC-target environment.The estimated CA50 timing is then fed back to the Mototron ECU for closed-loop combustion timing control.The closed-loop control system is developed based on the proportional-integral feedback structure.Finally, the closed-loop performance is examined by applying a fuel step change as a disturbance to the combustion timing control system.
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