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汽车安全与节能学报

汽车安全与节能学报 ›› 2011, Vol. 2 ›› Issue (3): 263-270.DOI: 10.3969/j.issn.1674-8484.2011.03.013

• • 上一篇    

均质混合气引燃发动机的燃烧与排放特性

于超，王建昕*，王志，王步宇   

  1. 清华大学 汽车工程系，汽车安全与节能国家重点实验室，北京100084
  • 收稿日期:2011-07-26 出版日期:2011-09-27 发布日期:2011-10-13
  • 通讯作者: 通讯作者：王建昕，教授。E-mail: wangjx@mail.tsinghua.edu.cn
  • 作者简介: 第一作者：于超（1985—），男（汉），山东，博士研究生。E-mail: appleofyt@gmail.com *通讯作者：王建昕，教授。E-mail: wangjx@mail.tsinghua.edu.cn

Combustion and emission characteristics of homogeneous charge induced ignition engines

YU Chao, WANG Jianxin*, WANG Zhi, WANG Buyu   

  1. State Key Laboratory of Automotive Safety and Energy, Department of Automotive Engineering, Tsinghua University, Beijing 100084, China
  • Received:2011-07-26 Online:2011-09-27 Published:2011-10-13

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摘要： 均质混合气引燃（HCII）的热效率显著高于汽油机，碳烟排放显著低于柴油机。本文在一台高压共轨柴油机改造的单缸机上对HCII燃烧特性进行了研究，将低温燃烧概念引入HCII燃烧中以降低NOx，同时用引燃燃料分段喷射方法改善大负荷时的粗暴燃烧。结果表明：HCII燃烧方式等容度高，油耗甚至低于柴油机；可以在较浓的空燃比下完全燃烧，拓宽了柴油机的浓限限制，获得更高的功率密度；HCII燃烧与废气再循环（EGR）结合可以实现低温燃烧，同时获得极低的NOx和碳烟排放；引燃柴油两次喷射能够明显降低放热率峰值，从而有效抑制压力升高率。

关键词: 均质混合气引燃（HCII）, 燃烧特性, 废气再循环（EGR）, 热效率, 排放

Abstract:  Homogeneous charge induced ignition (HCII) combustion mode can achieve higher thermal efficiency than gasoline SI combustion with lower soot emissions than diesel CI combustion. The combustion characteristics of HCII were investigated on a modified high-pressure common rail single-cylinder diesel engine. The concept of low temperature combustion was used to reduce NOx emissions with a two stage diesel injection strategy used to improve violent combustion of HCII for high  load conditions. The results show that HCII combustion mode has the characteristics of rapid heat release and short combustion duration at a high constant volume ratio. HCII combustion mode leads to complete combustion at richer fuel/air ratios, breaking through the rich limit of direct injection diesel engines for a higher power density. Combined with exhaust gas recirculation (EGR), HCII can achieve low temperature combustion with very low NOx and soot emissions. The two stage diesel injection can reduce the peak heat release rate, thus effectively inhibiting the maximum pressure rise rate.

Key words: homogeneous charge induced ignition (HCII), combustion, exhaust gas recirculation (EGR), thermal efficiency, emissions

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