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    • Research on Low-Temperature Passive Regeneration Characteristics of New Type National Ⅵ Catalytic Diesel Particulate Filter
    DOI：10.13949/j.cnki.nrjgc.2022.06.009
    Key Words:diesel engine  diesel oxidation catalyst（DOC）  catalytic diesel particulate filter（CDPF）  passive regeneration
    Author NameAffiliationE-mail
    ZHANG Quanchang* Research Center for Advanced Powertrain Technology， Hunan University， Changsha 410082， China bmd_2007@163.com 
    FENG Bin Research Center for Advanced Powertrain Technology， Hunan University， Changsha 410082， China  
    CHEN Guisheng* Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China cgs_yly@163.com 
    CHEN Jiahong Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China  
    LI Qing Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650500， China  
    PENG Yiyuan Kunming Yunnei Power Co.， Ltd.， Kunming 650501， China  
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    Abstract:Based on the self-built test rig of an engine with diesel oxidation catalyst（DOC）+catalytic diesel particulate filter（CDPF）， the passive regeneration equilibrium point temperature tests of SiC and cordierite CDPF were conducted. The effects of DOC fresh and aged parts on the carrier’s passive regeneration equilibrium point temperature were tested. And the passive regeneration characteristics of CDPF of both materials under low-temperature conditions were tested. The test results show that the passive regeneration equilibrium point temperature of SiC CDPF is about 295 ℃ and that of cordierite CDPF is about 310 ℃ when the carbon loading amount is 5 g/L. The aging parts of DOC have no pronounced effect on the passive regeneration equilibrium point temperature of SiC CDPF， but it will lead to the decrease of its passive regeneration efficiency. When no DOC is added， the passive regeneration equilibrium point temperature of SiC CDPF rises to 355 ℃ and it will cause a significant temperature difference between the internal temperature of the carrier axially and radially， which significantly reduces its regeneration efficiency （only 5%）. When the carbon loading amount is 5 g/L and the inlet temperature is 325 ℃， the passive regeneration efficiency of SiC CDPF is only 48.9% and the regeneration rate is 2.9 g/h. The regeneration rate of cordierite CDPF is 75.2% and 11.5 g/h， and the latter has better passive regeneration characteristics near this temperature.
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