不同测试工况对车用柴油机CH_(4)和N_(2)O排放的影响  

The influence of different testing conditions on CH_(4)and N_(2)O emissions from automotive diesel engines

作　　者：姚俊 王鹏 黄强炜 YAO Jun;WANG Peng;HUANG Qiangwei(Shanghai Motor Vehicle Inspection Certification&Tech Innovation Research Center Co.,Ltd.,Shanghai 201805,China)

机构地区：[1]上海机动车检测认证技术研究中心有限公司,上海201805

出　　处：《柴油机设计与制造》2024年第2期29-34,共6页Design and Manufacture of Diesel Engine

摘　　要：以某国六车用柴油机为试验对象,通过开展世界统一稳态循环(WHSC)和冷热态世界统一瞬态循环(WHTC)台架试验,分析和研究在不同边界条件下尾气中CH_(4)和N_(2)O的排放特性。结果表明:随排气背压增大,N_(2)O的WHSC比排放量逐渐变大,在冷热WHTC下N_(2)O的比排放量呈现先升高再降低的趋势;而CH_(4)的比排放量在2种循环中均先降后增。WHSC下随着进气阻力的增大,N_(2)O的比排放量增大;而CH_(4)的比排量放降低。冷热WHTC下的比排放量方面,N_(2)O呈现下降的趋势,而CH_(4)先增后减。WHSC和冷热WHTC下,CH_(4)的排放体积分数均处于无序波动状态,而N_(2)O体积分数会在负荷突增时出现峰值,二者浓度变化规律与边界条件无关。Taking a certain China VI vehicle diesel engine as the test object,the emission charac-teristics of CH_(4)and N_(2)O in exhaust gas under different boundary conditions were analyzed and studied through the China VI world harmonized steady cycle(WHSC)and cold and hot world harmonized tran-sient cycle(WHTC)bench tests.The results show that as the exhaust backpressure increases,the WHSC specific emissions of N_(2)O gradually increase.Under the cold and hot WHTC,the specific emis-sions of N_(2)O show a trend of first increasing and then decreasing,while the specific emissions of CH_(4)first decrease and then increase in both cycles.In the WHSC,as the intake resistance increases,the specific emissions of N_(2)O increase,while the specific emissions of CH_(4)decrease.In the cold and hot WHTC spe-cific emissions,N_(2)O shows a decreasing trend,while CH_(4)first increases and then decreases.In the WHSC and cold and hot WHTC,the emission concentration values of CH_(4)are in a disorderly fluctuation state,while the N_(2)O concentration will peak when the load suddenly increases,and the variation pattern of their concentrations is independent of the boundary conditions.

关 键 词：车用柴油机 CH_(4) N_(2)O 比排放量 进气阻力 排气背压 

分 类 号：U464.172[机械工程—车辆工程] X734.2[交通运输工程—载运工具运用工程]