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汽车安全与节能学报

汽车安全与节能学报 ›› 2014, Vol. 5 ›› Issue (01): 97-105.DOI: 10.3969/j.issn.1674-8484.2014.01.013

• 汽车节能与环保 • 上一篇    

用复合稀释燃烧改善直喷汽油机中小负荷油耗

王建昕，宋 涛，刘 辉，王 志   

  1. 清华大学 汽车安全与节能国家重点实验室，北京 100084，中国
  • 收稿日期:2013-11-27 出版日期:2014-03-25 发布日期:2014-04-08
  • 作者简介:王建昕(1953 － )，男（汉），山东，教授。E-mail: wangjx@tsinghua.edu.cn
  • 基金资助:
    国家自然科学基金重点项目(51036004); 科技部国际科技合作项目(2010DFA72760)

Lean dilution combustion (LDC) for improving fuel economy of gasoline direct injection engine at part-load

WANG Jianxin, SONG Tao, LIU Hui, WANG Zhi   

  1. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084,China
  • Received:2013-11-27 Online:2014-03-25 Published:2014-04-08

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摘要： 为了降低直喷汽油机的泵气损失、提升热效率，提出了将稀薄燃烧与废气稀释相结合的复合 稀释燃烧(LDC) 的路线。在一台缸内直喷汽油机上进行了中小负荷下的试验，以研究影响复合稀释燃 烧的因素，测量了发动机燃油经济性、燃烧特性及排放特性。结果表明：在200~600 kPa 的平均有 效压力下，复合稀释燃烧带来了4%~6% 的油耗改善，同时，发动机的NOx 排放不会急剧升高。对燃料 能量分配的分析表明：稀释燃烧降低了发动机传热损失和泵气能量损失。因而，验证了复合稀释燃烧 的可行性。

关键词: 汽油机, 缸内直喷, 复合稀释燃烧, 废气稀释, 空气稀释, 燃油消耗率

Abstract: A concept of lean dilution combustion (LDC) was proposed for gasoline direct injection (GDI) engines with combining lean dilution burn and exhaust gas dilution to reduce pumping loss and to improve brake thermal efficiency. The influential factors of LDC were investigated by experiments on a GDI engine at partload to measure the fuel economy (fuel energy distribution), the combustion characteristics, and the emission characteristics of the engine. The results show that the fuel economy is improved 4%—6% more at the engine brake mean effective pressure of 200—600 kPa, without too much NOx emissions by employing LDC. Fuel energy distribution indicates that the LDC reduces the engine loss of heat transfer and pumping, and the LDC mode is proved to be feasible.

Key words: gasoline engine gasoline direct injection (GDI), lean dilution combustion exhaust gas dilution air dilutiofuel consumption

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