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    • Study on Particulate Matter Emission Characteristics and Filtration Characteristics of the Gasoline Particulate Filter of A Small Utility Gasoline Engine
    DOI：10.13949/j.cnki.nrjgc.2023.05.013
    Key Words:small utility gasoline engine  particulate matter  emission  gasoline particulate filter（GPF）  filtration characteristic
    Author NameAffiliationE-mail
    PENG Meichun* School of Electro-Mechanical Engineering， Guangdong University of Technology， Guangzhou 510006， China mcpeng@gdut.edu.cn 
    XIAO Guohuang School of Electro-Mechanical Engineering， Guangdong University of Technology， Guangzhou 510006， China xiaoguohuang1@163.com 
    YANG Chen School of Electro-Mechanical Engineering， Guangdong University of Technology， Guangzhou 510006， China scauyc@foxmail.com 
    WANG Hailong School of Electro-Mechanical Engineering， Guangdong University of Technology， Guangzhou 510006， China whl_nick@163.com 
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    Abstract:A small gasoline engine for generator was used to study the emission characteristics of particulate matter and investigate the filtration characteristics of gasoline particulate filter（GPF） on exhaust particulate matter. A six-condition emission test cycle was designed to test the particulate matter emissions of the gasoline engines equipped with and without GPF. It is found that the specific emission of particulate number（PN） is 3.71012 #/（kW‧h）， and that of particulate mass（PM） is 2.2 mg/（kW‧h）. Both PN and PM concentrations show a decreasing and then increasing trend with increasing load， with the highest emission concentrations at low loads and the lowest at medium loads. The number of particles whose diameters are smaller than 312.7 nm accounts for more than 99.5% of the total PN， and the mass of paritcles whose diameters are larger than 312.7 nm accounts for 91.4%~98.7% of the total PM. It indicates that the number of ultrafine particles is large， but the mass of ultrafine particles is low. The PN emission concentration decreases with increasing particle size. The PM emission concentration first increases， then decreases and increases again with increasing particle size at low loads， and increases with increasing particle size at medium and high loads. The filtration efficiency of GPF is 73.7% for PN and 59.7% for PM. GPF has higher filtration efficiency for nuclear particles whose diameters are below 50 nm than the accumulation and coarse particles.
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