轻型汽油车主要含氮化合物排放特性研究  

Nitrogen-containing Compounds Emission Characteristics of Light-duty Gasoline Vehicles

作　　者：罗佳鑫 温溢[1] 朱庆功[1] 潘朋[1] 杨正军[1] LUO Jiaxin;WEN Yi;ZHU Qinggong;PAN Peng;YANG Zhengjun(China Automotive Technology and Research Center Co.,Ltd.,Tianjin,300300,China)

机构地区：[1]中国汽车技术研究中心有限公司,天津300300

出　　处：《小型内燃机与车辆技术》2021年第5期42-47,共6页Small Internal Combustion Engine and Vehicle Technique

摘　　要：选取16辆满足不同排放标准的轻型汽油车进行了不同循环(NEDC和WLTC)下的排放试验,对试验车辆的主要含氮化合物排放进行了分析。此外选取2辆轻型车对比了发动机原排与经过三元催化剂后的尾气排放。结果表明:在轻型车含氮化合物中,国5轻型车NO、NO_(2)、N_(2)O与NH_(3)平均排放因子为5.55、2.74、1.48、5.75 mg/km;国6轻型车NO、NO_(2)、N_(2)O与NH_(3)平均排放因子为8.25、3.89、1.30、2.65 mg/km;N_(2)O与NH_(3)的成分比例约为6%与30%;采用进气道喷射与自然吸气相结合的轻型车辆NH_(3)与N_(2)O排放量较高;N_(2)O与NH_(3)主要生成于循环过程中的加速过程,加速过程中较高的CO排放促进三元内N_(2)O与NH_(3)的生成。Sixteen light-duty gasoline vehicles are selected to conduct the emission tests based on the laboratory cycles.The nitrogen-containing compounds emissions have been analyzed.At the same time,two light-duty vehicles are selected to compare the raw exhaust with the tailpipe exhaust.The results show that the mean emission factors of NO,NO_(2),N_(2)O and NH_(3) of vehicles meeting the China V emission standard are 5.55,2.74,1.48 and 5.75 mg/km,respectively.Meanwhile,the mean emission factors of NO,NO_(2),N_(2)O and NH_(3) of vehicles meeting the ChinaⅥemission standard are 8.25,3.89,1.30 and 2.65 mg/km,respectively.The proportion of N_(2)O and NH_(3) in nitrogen-containing compounds of light-duty vehicles is about 6%and 30%,respectively.The NH_(3) and N_(2)O emissions of vehicles with port fuel injection and natural aspirated gas are higher.N_(2)O and NH_(3) are mainly generated during the acceleration process,while higher CO emissions enter the three-way catalyst and promote the formation of N_(2)O and NH_(3) in results.

关 键 词：氧化亚氮 WLTC工况 NEDC工况 三元催化剂 氨排放 

分 类 号：U467.13[机械工程—车辆工程]