高效车用汽油机的技术进步

被引:33
作者
王建昕
机构
[1] 清华大学汽车安全与节能国家重点实验室
关键词
车用汽油机; 高效率; 汽油缸内直喷; 均质混合气压燃;
D O I
10.16236/j.cnki.nrjxb.2008.s1.004
中图分类号
U464.171 [汽油机];
学科分类号
080703 ;
摘要
论述了车用汽油机的应用现状及其节能的潜力。作为基本指导思想,由热力学基本公式分析得到了提高汽油机热效率的途径是提高压缩比、稀薄燃烧以及降低泵气损失,同时指出应提高燃烧等容度以及降低循环波动。介绍了在进气道喷射汽油机上采取的节能技术,如提高压缩比、VVT、米勒循环以及停缸等。回顾并分析了缸内直喷汽油机(GDI)的发展历程与现状,特别分析对比了稀燃GDI与当量比GDI的优劣。最后,介绍了基于GDI发动机进行的HCCI以及HCII燃烧研究,指出分层混合气与SICI组合燃烧方式是在HCCI核心思想上衍生出来的,可以有效拓宽HCCI运行范围。
引用
收藏
页码:83 / 89
页数:7
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