中文摘要：

在一台安装了氢气电控喷射系统的汽油机上,通过调整喷氢脉宽,研究了氢气占进气体积分数为3%时混氢对稀燃汽油机怠速燃烧与排放性能的影响。试验结果表明,混氢后发动机指示热效率提高;火焰发展期与快速燃烧持续期缩短;过量空气系数为1.3时,平均指示有效压力的循环变动系数由原机的33.9%降低至混氢后的13.7%;稀燃条件下,进气混氢有利于改善汽油机怠速时的HC、CO与NOx排放。

英文摘要：

In view of high cyclic variation and HC emissions of the lean-burn gasoline engine at idle conditions,an experimental investigation was carried out on a gasoline engine equipped with an electrical controlled hydrogen injection system.The hydrogen volume fraction in the total intake of 3% was adopted through adjusting hydrogen injection duration to study the effect of hydrogen enrichment on combustion and emission characteristics of a lean-burn gasoline engine at idle.The test results demonstrated that the indicated thermal efficiency was improved;flame development period and rapid burning duration were shortened after hydrogen enrichment.When the excess air ratio was 1.3,the coefficient of variation in indicated mean effective pressure was dropped from 33.9% of the original engine to 13.7% of the 3% hydrogen-enriched engine.Under idle and lean conditions,the addition of hydrogen was effective on improving HC,CO and NOx emissions performance of the SI engine.