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汽车安全与节能学报

JASE ›› 2017, Vol. 08 ›› Issue (03): 310-316.DOI: 10.3969/j.issn.1674-8484.2017.003.012

• 汽车节能与环保 • 上一篇    下一篇

小排量增压天然气发动机的燃烧特性

李伟鑫，杨 陈，尹建东，沈 源，王瑞平   

  1. 吉利动力总成研究院，宁波 315336，中国
  • 收稿日期:2017-07-17 出版日期:2017-09-28 发布日期:2017-10-03
  • 作者简介:第一作者 / First author ： 李伟鑫(1990—)，男( 汉)，广东，助理工程师。E-mail: liweixin1@geely.com。

Combustion characteristic of a downsized turbocharged compressed natural gas engine

LI Weixin, YANG Chen, YIN Jiandong, SHEN Yuan, WANG  Ruiping   

  1. Geely Powertrain Research Institute, Ningbo 315336, China
  • Received:2017-07-17 Online:2017-09-28 Published:2017-10-03

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摘要：

为在不影响发动机性能指标的前提下，减少尾气中的二氧化碳和其他气体污染物排放，开发了一款由小型增压汽油发动机经过二次开发而成的压缩天然气(CNG) 气道喷射 (PFI) 点燃式发动机。定量分析了小型增压天然气发动机的燃料性能优势，降低爆震强度，优化了压缩比，提高了燃烧效率。爆发压强控制在12 MPa 以下，最大扭矩为180 Nm ；在转速为3 000 r/min 时，该天然气发动机的扭矩与原型机处于同一水平。当采用优化后的压缩比应用于CNG 模式时，有效热效率达到了38%。因此，与汽油相比，CNG 模式能够令二氧化碳排放减少24.2%，里程燃油成本节省46.4%。

关键词: 点燃式发动机, 气道喷射 (PFI) , 压缩天然气(CNG) , 增压, 热效率, 二氧化碳减排

Abstract:

A turbocharged spark-ignition engine with port fuel injection (PFI) was developed suing compressed natural gas (CNG) based on a secondary development for a downsizing gasoline engine to reduce both vehicle tailpipe CO2 emissions and other exhaust gas emissions without compromising driving performance. This paper quantified the advantage of fuel performance characteristics of the downsized CNG engine with reduced knock sensitivity, optimized compression ratio, and improved combustion efficiency. While peak cylinder pressure was controlled below 12 MPa, peak torque 180 Nm, same level as gasoline variant, was realized from 3 000 r/min. With adapted compression ratio for CNG operation, effective combustion efficiency is over 38%, which is even higher than turbocharged gasoline direct injection (TGDI) version. Therefore, compared to gasoline application, operation with CNG will lead to 24.2% of CO2 emission reduction as well as 46.4% of mileage-specific fuel cost saving.

Key words: spark-ignition engine, port fuel injection (PFI), compressed natural gas (CNG), turbo-charger, thermal efficiency, CO2 emission reduction