As compared to conventional diesel heavy-duty vehicles,natural gas vehicles have been proved to be more eco-friendly due to their lower production of greenhouse gas and pollu-tant emissions,which are causing enormous adverse effects on global warming and air pol-lution.However,natural gas vehicles were rarely studied before,especially through on-road measurements.In this study,a portable emission measurement system(PEMS)was em-ployed to investigate the real-world emissions of nitrogen oxides(NOx)(nitrogen monoxide(NO),nitrogen dioxide(NO2)),total hydrocarbons(THC),carbon monoxide(CO),and carbon dioxide(CO2)from two liquified natural gas(LNG)China V heavy-duty cleaning sanitation trucks with different weight.Associated with the more aggressive driving behaviors,the ve-hicle with lower weight exhibited higher CO2(3％)but lower NOx(48.3％)(NO2(78.2％)and NO(29.4％)),CO(44.8％),and THC(3.7％)emission factors.Aggressive driving behaviors were also favorable to the production of THC,especially those in the medium-speed range but sig-nificantly negative to the production of CO and NO2,especially those in the low-speed range with high engine load.In particular,the emission rate ratio of NO2/NO decreased with the increase of speed/scaled tractive power in different speed ranges.

Jiguang Wang;Huaqiao Gui;Zhiwen Yang;Tongzhu Yu;Xiaowen Zhang;Jianguo Liu

Key Laboratory of Environmental Optics and Technology,Anhui Institute of Op tics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China;China Automotive Technology and Research Center Co.,Ltd,Tianjin 300300,China;Innovation excellence center for urban atmospheric environment,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China

环境科学学报（英文版）

[1]Jiguang Wang;Huaqiao Gui;Zhiwen Yang;Tongzhu Yu;Xiaowen Zhang;Jianguo Liu-.Real-world gaseous emission characteristics of natural gas heavy-duty sanitation trucks)[J].环境科学学报（英文版）,2022(05):319-329

liquified,Aggressive

Real,world,gaseous,characteristics,natural,heavy,duty,sanitation,trucks,compared,conventional,diesel,vehicles,have,been,proved,more,eco,friendly,due,their,lower,production,greenhouse,pollu,tant,emissions,which,causing,enormous,adverse,effects,global,warming,air,lution,However,were,rarely,studied,before,especially,through,road,measurements,In,this,study,portable,system,PEMS,was,ployed,investigate,real,nitrogen,oxides,NOx,monoxide,dioxide,NO2,total,hydrocarbons,THC,from,two,LNG,China,cleaning,different,weight,Associated,aggressive,driving,behaviors,exhibited,higher,but,factors,also,favorable,those,medium,speed,sig,nificantly,negative,engine,load,particular,rate,ratio,decreased,increase,scaled,tractive,power,ranges

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