研究生: |
傅勝文 Kenny Purnomo |
---|---|
論文名稱: |
缸內直噴汽油引擎之層狀及均質油氣混 合實驗研究 Experimental Study on the Stratified and Homogeneous Charge Operation of a Gasoline Direct Injection (GDI) Engine |
指導教授: |
姜嘉瑞
Chia-Jui Chiang |
口試委員: |
蘇裕軒
Yu-Hsuan Su 吳浴沂 Yuh-Yih Wu |
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: | 2017 |
畢業學年度: | 105 |
語文別: | 英文 |
論文頁數: | 105 |
中文關鍵詞: | Gasoline direct injection 、homogeneous mode 、stratified mode |
外文關鍵詞: | Gasoline direct injection, homogeneous mode, stratified mode |
相關次數: | 點閱:303 下載:0 |
分享至: |
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A gasoline direct injection engine allows a combustion to run in stratied charge
operation. In comparison to homogeneous charge operation, the stratied charge
operation is able to utilize an overall lean mixture. In collaboration with an engine
company, this paper uses a wall-guided direct injection engine with a turbocharger
system. Through this wall-guided type engine, the mixture is injected directly at
the piston head surface in the compression stroke. Performing split injections,
which are in intake and compression strokes, provides a stoichiometric mixture
near the spark plug while maintaining overall lean mixture inside the cylinder.
The rst injection of fuel is performed in the intake stroke at a xed timing and
various pulse widths, while the second injection timing and pulse width are varied.
Fuel pressure, valve timing, and spark timing are also adjusted in order to achieve
optimal performance. Combustion duration of each modes are determined using
ve dierent methods: (I) Entropy method, (II) Logarithmic scale method, (III)
Two in
ection points of specic heat ratio, (IV) Mass fraction burned, and (V)
Heat release method. It is observed that the best method to describe the combus-
tion characteristic of stratied charge operation is the heat release method. When
operated in low load and engine speed, fuel pressure is a parameter that deter-
mines the stability in a wall-guided type engine with multi-hole injectors. The
best brake specic fuel consumption improvement, about 19.55% is obtained at
stratied mode. Exhaust emission amounts
uctuate depending on the operating
conditions of an engine.
A gasoline direct injection engine allows a combustion to run in stratied charge
operation. In comparison to homogeneous charge operation, the stratied charge
operation is able to utilize an overall lean mixture. In collaboration with an engine
company, this paper uses a wall-guided direct injection engine with a turbocharger
system. Through this wall-guided type engine, the mixture is injected directly at
the piston head surface in the compression stroke. Performing split injections,
which are in intake and compression strokes, provides a stoichiometric mixture
near the spark plug while maintaining overall lean mixture inside the cylinder.
The rst injection of fuel is performed in the intake stroke at a xed timing and
various pulse widths, while the second injection timing and pulse width are varied.
Fuel pressure, valve timing, and spark timing are also adjusted in order to achieve
optimal performance. Combustion duration of each modes are determined using
ve dierent methods: (I) Entropy method, (II) Logarithmic scale method, (III)
Two in
ection points of specic heat ratio, (IV) Mass fraction burned, and (V)
Heat release method. It is observed that the best method to describe the combus-
tion characteristic of stratied charge operation is the heat release method. When
operated in low load and engine speed, fuel pressure is a parameter that deter-
mines the stability in a wall-guided type engine with multi-hole injectors. The
best brake specic fuel consumption improvement, about 19.55% is obtained at
stratied mode. Exhaust emission amounts
uctuate depending on the operating
conditions of an engine.
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