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An Experimental Study on Regeneration Characteristics by Variation of Exhaust Gas Temperature, HC and $O_2$ Concentrations on DOC-CDPF System  

Cho, Yong-Seok (Department of Mechanical and Automotive Engineering, Kookmin University)
Lee, Seang-Wock (Department of Mechanical and Automotive Engineering, Kookmin University)
Lee, Jung-Sub (Graduated School of Automotive Engineering, Kookmin University)
Yoon, Yu-Bin (Graduated School of Automotive Engineering, Kookmin University)
Park, Young-Joon (Graduated School of Automotive Engineering, Kookmin University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.17, no.1, 2009 , pp. 43-49 More about this Journal
Abstract
A catalyzed diesel particulate filter (CDPF) causes the progressive increase in back pressure of an exhaust system due to the loading of soot particles. To minimize pressure drop which is generated by CDPF, the filter should be regenerated when it collects a certain quantity of soot. It is important to know characteristics of regeneration of CDPF with various of exhaust gas temperatures and compositions. The oxidation of HC in DOC leads to increase gas temperature of DOC downstream. The increased gas temperature by DOC has an positive effect on CDPF regeneration. This study presents characteristics of regeneration of CDPF with DOC according to various gas composition, such as HC and $O_2$ concentration. The test-rig is used to control each gas composition and temperature during regeneration of CDPF. Experimental results indicate that the increased concentration of $O_2$ regenerates DPF more actively. With increasing HC concentration, the gas temperature of CDPF upstream increased due to more oxidation of HC. But excessive supply of HC leads to decrease of $O_2$ concentration in the CDPF, which makes it hard to regenerate CDPF.
Keywords
CDPF; Regeneration; PM; DOC; Exhaust gas composition; Exhaust gas temperature; Oxygen; Hydrocarbon;
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