贾会星,赵妞,杨诚,等.汽油压燃发动机燃烧特性和污染物排放的试验研究[J].内燃机工程,2022,43(5):54-60.
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
DOI：10.13949/j.cnki.nrjgc.2022.05.008
关键词:汽油压燃  热效率  后处理  排放
Key Words:gasoline compression ignition  thermal efficiency  after-treatment  emission
基金项目: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）
作者单位E-mail
贾会星* 滁州职业技术学院 机械与汽车工程学院，滁州 239000 jiahuixing_0@163.com 
赵妞 皖江工学院 机械工程学院，马鞍山 243031  
杨诚 滁州职业技术学院 机械与汽车工程学院，滁州 239000  
陈伟国 奇瑞汽车股份有限公司 发动机工程研究院，芜湖 241006  
潘金元 奇瑞汽车股份有限公司 发动机工程研究院，芜湖 241006  
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摘要:基于一台2.0 L柴油发动机，在1 500 r/min、平均有效压力（brake mean effective pressure， 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NOx捕集器（lean NOx 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NOx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NOx、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。
Abstract: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 1 500 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 NOx 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 NOx 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 NOx， 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.
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