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    • Effects of Diesel Oxidation Catalyst and Selective Catalytic Reduction System on Diesel Engine Performance at Different Altitudes
    DOI：10.13949/j.cnki.nrjgc.2022.03.011
    Key Words:diesel  altitude  diesel oxidation catalyst（DOC）  selective catalytic reduction（SCR）
    Author NameAffiliationE-mail
    YAN Jie* Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China 840545183@qq.com 
    BI Yuhua* Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China 815569621@qq.com 
    NIE Xuexuan Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China  
    WANG Peng Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China  
    WAN Mingding Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China  
    SHEN Lizhong Yunnan Province Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China  
    PENG Yiyuan Yunnan Provincial Key Laboratory of Internal Combustion Engine Plateau Emission， Kunming Yunnei Power Co.， Ltd.， Kunming 650500， China  
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    Abstract:Based on the plateau test rig of diesel engine， the external characteristic test of diesel engine was carried out under the atmospheric pressure of 80 kPa， 90 kPa and 100 kPa. The changes of intake and exhaust state parameters， power performance， fuel economy， combustion performance and emission characteristics of diesel engine with diesel oxidation catalyst（DOC） and selective catalytic reduction（SCR） were studied. The results show that the addition of DOC+SCR can reduce the intake mass flow， exhaust back pressure， engine power and torque， fuel consumption， exhaust temperature， exhaust mass flow， and HC， CO， NOx and smoke emissions. The influences of DOC+SCR at different altitudes are also different， especially for exhaust temperature， exhaust back pressure， BFSC and SCR conversion efficiency. After adding DOC and SCR， the exhaust temperatures at 80 kPa， 90 kPa and 100 kPa increased by 7.35%， 7.21% and 7.11% respectively. The exhaust back pressures increased by 28.02%， 27.08% and 26.81 % on average， respectively. The effective fuel consumption rates increased by 1.64%， 2.87% and 2.94% on average， respectively. The maximum conversion efficiencies of SCR under external characteristic conditions were 88.86%， 86.11% and 84.76%， respectively.
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