【摘要】 在缸内直喷汽油机(GDI)上采用多次燃油喷射和可变配气技术来控制缸内混合气形成和燃烧,实现了SI/HCCI复合燃烧方式。研究了不同压缩比和辛烷值对均质混合气压燃(HCCI)燃烧排放特性的影响。结果表明,汽油HCCI燃烧呈现单阶段燃烧燃料特性,HCCI着火发生在上止点附近时油耗低。低压缩比下,HCCI燃烧可以在较浓空燃比下工作,NOx排放较高。高辛烷值燃料HCCI燃烧可运行的负荷范围窄。汽油HCCI发动机在偏高压缩比条件下燃用偏低辛烷值汽油可以获得较好的经济性和排放性能。更多还原

【Abstract】 In this paper,multiple injection strategy and variable valve technology were utilized to achieve SI/HCCI hybrid combustion in a gasoline direct injection engine.The effect of HCCI combustion and emission on different compression ratios and fuel properties were investigated.The results show that gasoline HCCI combustion demonstrates single-stage heat release process.Ignition near TDC leads to lower fuel consumption.Lower compression ratio leads to richer HCCI combustion with higher NOx emission.Higher octane gasoline leads to narrower HCCI load operation range.Gasoline HCCI engine fueled lower octane fuel with lower compression ratio can achieve better performance on economy and emission.更多还原