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    • Real Driving Emissions from China Ⅵ Heavy-Duty Diesel–Liquefied Natural Gas Vehicles
    DOI：10.13949/j.cnki.nrjgc.2022.05.009
    Key Words:heavy-duty vehicle  liquefied natural gas（LNG）  real drivingemission  China Ⅵ emission regulation
    Author NameAffiliationE-mail
    WANG Shuda* School of Mechanical Engineering， Beijing Institute of Technology， Beijing 100081， China wangshuda97@foxmail.com 
    TAN Jianwei* School of Mechanical Engineering， Beijing Institute of Technology， Beijing 100081， China tanjianwei@bit.edu.cn 
    Lü Liqun School of Mechanical Engineering， Beijing Institute of Technology， Beijing 100081， China  
    HAO Lijun School of Mechanical Engineering， Beijing Institute of Technology， Beijing 100081， China  
    WANG Xin School of Mechanical Engineering， Beijing Institute of Technology， Beijing 100081， China  
    GE Yunshan School of Mechanical Engineering， Beijing Institute of Technology， Beijing 100081， China  
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    Abstract:A portable emission testing system（PEMS） was used to test the real driving emissions of four typical heavy-duty diesel vehicles and four typical heavy-duty liquefied natural gas（LNG） vehicles respectively. The real driving emission characteristics of NOx， CO， CO2， and particulate number（PN） were analyzed by the work-based window method and trip average method. The results indicats that the emission aftertreatment technology can effectively control the NOx， CO， and PN emission factors of China Ⅵ heavy-duty diesel vehicles under real driving conditions. However， the CO emission of LNG vehicles have a risk of exceeding the emission limit， and some LNG vehicles have a phenomenon of over-NOx-emission. The PN emissions are uncertain， and some LNG vehicles have higher PN emissions. For carbon emissions， the real driving CO2 emission factors of LNG vehicles are 6%~18% lower than those of diesel vehicles， where the carbon reduction is of a great manifest.
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