【作者】 高章； 刘双喜； 颜伏伍； 王凤滨；

【Author】 Gao Zhang;Liu Shuangxi;Yan Fuwu;Wang Fengbin;School of Automotive Engineering,Wuhan University of Technology;China,Automotive Technology and Research Center;

【机构】 武汉理工大学汽车工程学院； 中国汽车技术研究中心；

【摘要】 在CVS全流采样的发动机台架上,对国IV发动机进行ESC测试,并利用FTIR气体分析仪对非常规气体进行测量。通过对比有无DOC+POC和SCR排放后处理装置下发动机的NO₂和NO_x排放特性,对NO₂的排放比例进行了分析研究;同时还分析了SCR系统下的二次污染物NH₃的泄漏。研究结果表明DOC+POC可以使NO_x中NO₂的比例升高,但对大部分工况下NO_x的排放量影响较小;SCR系统下NO₂的比例比DOC+POC系统要低。中低负荷下NO₂比例较高。SCR系统还造成NH₃的泄漏,高负荷工况下NH₃的泄漏情况比较严重。更多还原

【Abstract】 The experiment tested China Ⅳ engines on an engine dynamometer with the CVS full-flow dilution sampling system in ESC test cycle and measured unregulated gaseous emissions with FTIR analysis equipment.The paper contrasted NO_x and NO,emitted from the engines with and without advanced after-treatments including DOC + POC and SCR,researched the ratio of NO₂ in NO_x and analyzed NH₃ leakage of the engine with SCR system.The result shows that DOC + POC system can enlarge the ratio of NO₂ in NO_x.But this system has little influence on the NO_x in the most modes.The ratio of NO₂ in NO_x of SCR system is lower than DOC + POC system.The NO₂ ratio is higher during low and medium load.But the SCR system causes the NH₃ emission.NH₃ leakage is comparatively higher during high load.更多还原