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    • Research on Real-World Emission for Urban Heavy-Duty Diesel Vehicles Under Low Load Conditions
    DOI：10.13949/j.cnki.nrjgc.2022.04.010
    Key Words:urban heavy-duty diesel vehicle  low load  emission  portable emission measurement system（PEMS）
    Author NameAffiliationE-mail
    WANG Zhihong* School of Automotive Engineering， Wuhan University of Technology， Wuhan 430070， China
    Hubei Key Laboratory of Advanced Technology for Automotive Components， Wuhan University of Technology， Wuhan 430070， China     		wangzhihong@whut.edu.cn 
    PANG Bo* School of Automotive Engineering， Wuhan University of Technology， Wuhan 430070， China
    Hubei Key Laboratory of Advanced Technology for Automotive Components， Wuhan University of Technology， Wuhan 430070， China     		752389883@qq.com 
    ZHANG Yuanjun Xiangyang Da An Automobile Test Center，Xiangyang 441004，China  
    DU Hongyun Xiangyang Da An Automobile Test Center，Xiangyang 441004，China  
    DONG Menglong School of Automotive Engineering， Wuhan University of Technology， Wuhan 430070， China
    Hubei Key Laboratory of Advanced Technology for Automotive Components， Wuhan University of Technology， Wuhan 430070， China     		 
    HU Jie School of Automotive Engineering， Wuhan University of Technology， Wuhan 430070， China
    Hubei Key Laboratory of Advanced Technology for Automotive Components， Wuhan University of Technology， Wuhan 430070， China     		 
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    Abstract:Based on the portable emission measurement system（PEMS）， three different types of urban heavy-duty diesel vehicles（HDDVs） were subjected to actual road emission tests. Experimental vehicles include postal vehicles， garbage dump trucks， and special school buses for elementary schools. The data in different load segments were classified and sorted out to analyze the emission proportion and specific emission results of carbon monoxide（CO）， NOx， particulate number（PN） in different load segments under low load conditions， and the NOx emission characteristics were analyzed with the work-based window method. Test results show that when the engine load rate of the test vehicle is in the low load range of 0~20%， the proportions of CO， NOx and PN emissions account for 72%~86%， 60%~87% and 52%~88% respectively， and the specific emissions of CO， NOx， and PN under low load conditions are higher than or close to the China Ⅵ emission regulation.
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