汽油压燃发动机燃烧特性和污染物排放的试验研究  

Experimental Study on Combustion and Emissions of A Gasoline Compression Ignition Engine

作　　者：贾会星[1] 赵妞 杨诚[1] 陈伟国[3] 潘金元[3] JIA Huixing;ZHAO Niu;YANG Cheng;CHEN Weiguo;PAN Jinyuan(School of Mechanical and Automotive Engineering,Chuzhou Polytechnical,Chuzhou 239000,China;School of Mechanical Engineering,Wanjiang University of Technology,Maanshan 243031,China;Engine Engineering Research Institute,Chery Automobile Co.,Ltd.,Wuhu 241006,China)

机构地区：[1]滁州职业技术学院机械与汽车工程学院,滁州239000 [2]皖江工学院机械工程学院,马鞍山243031 [3]奇瑞汽车股份有限公司发动机工程研究院,芜湖241006

出　　处：《内燃机工程》2022年第5期54-60,共7页Chinese Internal Combustion Engine Engineering

基　　金：安徽省高校自然科学研究重点项目(KJ2018A0836,KJ2020A0837,KJ2021A1411);安徽省高校优秀青年人才支持项目(gxyq2017222)。

摘　　要：基于一台2.0 L柴油发动机,在1500 r/min、平均有效压力(brake mean effective pres⁃sure,BMEP)0.4 MPa~0.9 MPa工况下进行了汽油压燃(gasoline compression ignition,GCI)和柴油压燃(diesel compression ignition,DCI)的燃烧和原始污染物排放的对比研究。此外,基于6个全球轻型车统一测试循环(worldwide harmonized light vehicle test cycle,WLTC)聚类工况点,进行了三元催化器(three-way catalyst,TWC)和稀燃NO_(x)捕集器(lean NO_(x) trap,LNT)或被动选择性催化还原器(passive selective catalytic reduction,PSCR)组合的污染物后处理方案的研究。研究结果表明:在负荷较低时,由于油气过度混合,缸内温度低,GCI的有效热效率低于DCI。随着负荷的提高,相比DCI,GCI的热效率明显改善,有效热效率最多提升至约43.0%。不同负荷下,相比DCI,GCI的NO_(x)排放略微下降,碳烟烟度(filter smoke number,FSN)显著下降;相比DCI,GCI的CO排放和HC排放在低负荷时大幅提高,但随着负荷提高,GCI的CO排放和HC排放与DCI的差距减小。基于某款车型实际测试的WLTC循环的6个聚类点对NO_(x)、HC、CO污染物排放的后处理进行评估,GCI发动机采用TWC+LNT/PSCR的后处理方案在满足国六b排放法规方面具有一定的潜力。Based on a 2.0 L diesel engine,the combustion and original pollutant emissions of gasoline compression ignition(GCI)and diesel compression ignition(DCI)at 1500 r/min and break mean effective pressure(BMEP)of 0.4 MPa~0.9 MPa were compared.Besides,based on six worldwide harmonized light vehicle test cycle(WLTC)cluster operating points,the pollutant after-treatment scheme of three-way catalyst(TWC)+lean NO_(x) trap(LNT)/passive selective catalytic reduction(PSCR)was studied.Results show that the brake thermal efficiency of GCI is lower than that of DCI at low load due to excessive fuel–air mixing and low cylinder temperature.Compared with DCI,with the increase of load,the thermal efficiency of GCI was significantly improved.The maximum brake thermal efficiency was increased to 43.0%.At different loads,compared with DCI,the NO_(x) emission of GCI was slightly lower,and the filter smoke number(FSN)was significantly improved.The CO emission and HC emission of GCI increased significantly at low load compared with DCI.And with the increase of load,the difference between GCI and DCI of CO emission and HC emission decreased.Based on tested six WLTC cluster operating points at a certain car,the after-treatment results of NO_(x),HC and CO pollutant emissions were evaluated.The after-treatment scheme of GCI engine with TWC+LNT/PSCR has the potential in meeting the national six b emission regulations.

关 键 词：汽油压燃 热效率 后处理 排放 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]