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汽车安全与节能学报

汽车安全与节能学报 ›› 2019, Vol. 10 ›› Issue (3): 366-373.DOI: 10.3969/j.issn.1674-8484.2019.03.013

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深度 Miller循环在增压直喷汽油机上的仿真和试验

陈 虎，贾 宁，刘小平，刘永亮，李泽峰，胡国锐   

  1. （北京宝沃汽车有限公司 工程研究院，北京 102206，中国）
  • 收稿日期:2019-01-24 出版日期:2019-09-30 发布日期:2019-10-01
  • 作者简介:第一作者：陈虎 (1980—)，男( 汉)，北京，高级工程师。E-mail: Chenhu@tsinghua.org.cn。 第二作者：贾宁 (1982—)，男( 汉)，河北，工程师。E-mail: 82295329@qq.com。

Simulations and experiments of effect of deep Miller cycle on a turbocharged gasoline direct injection engine

CHEN Hu, JIA Ning, LIU Xiaoping, LIU Yongliang, LI Zefeng, HU Guorui   

  1. (Research & Development Institute, Beijing Borgward Automotive Co,. Ltd., Beijing 102206, China)
     
  • Received:2019-01-24 Online:2019-09-30 Published:2019-10-01

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摘要：

      为降低某款2.0-L直列四缸涡轮增压直喷（GDI）原型汽油机的油耗水平，研究了深度Miller 循环(DMC)对油耗、动力和排放的影响。采用一维仿真、计算流体力学（CFD）和试验设计（DOE）， 分别优化了深度Miller的凸轮升程、相位和与凸轮匹配的高压缩比，分析了缸内滚流运动及喷雾特性， 通过试验研究了深度Miller循环对汽油机的燃烧性能、泵气损失、燃油消耗率、动力、排放等方面 的影响。结果表明：应用深度Miller循环后，发动机在中小负荷区域能够大幅降低燃油消耗率；搭载 该机型的整车在新标欧洲循环（NEDC）下油耗减少4.1%。

关键词: 增压直喷汽油机 , 深度Miller循环 (DMC) , 高压缩比 , 泵气平均有效压力 , 新欧洲行驶循 环(NEDC)

Abstract:

 The effects of deep Miller cycle (DMC) on fuel consumption, power and emissions were invest- igated to reduce the fuel consumption of an 2.0-L in-line four cylinders gasoline direct injection (GDI) original engine by simulation and experiment. The cam lift , phase position and higher compression ratio (CR) for DMC were optimized wih one-dimensional simulation software, and the tumble motion and atomization characteristic were analyzed with computational fluid dynamics (CFD) software, and the effects of DMC on combustion performance, pumping mean effective pressure (PMEP), brake specific fuel consumption (BSFC), power, emission and others were investegated with design of experiment (DOE). The results showed that the fuel consumption of the engine were greatly reduced in the middle and small load areas by using the DMC. The fuel consumption of the vehicle with the engine were reduced 4.1% under the New European Driving Cycle (NEDC) by the ananlysis with the one-dimensional simulation.

Key words: turbocharged gasoline direct injection engine , deep Miller cycle (DMC), high com pression ratio, pumping mean effective pressure , fuel consumption , New European Driving Cycle (NEDC)