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Passive Regeneration Characteristics of a DOC/Asymmetric-CDPF System for Heavy-Duty Diesel Engines

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Abstract

In this study, the properties of diesel particulate filter (DPF) structures were analyzed in terms of the particulate matter (PM) regeneration of the catalyzed DPF (cDPF) and the exhaust gas reduction efficiency. The performance of the cDPF in combination with a diesel oxidation catalyst was verified by measuring the balance point temperature (BPT) and by conducting world harmonized transient cycle (WHTC)/world harmonized stationary cycle (WHSC)-mode testing using a heavy-duty diesel engine bench. The BPT measurement results (238 °C) showed that, compared with the symmetric cDPF, the asymmetric cDPF exhibited better PM regeneration properties. Additionally, it demonstrated excellent performance in terms of fuel efficiency and reduction efficiency for the total hydrocarbons, carbon monoxide, and PM in exhaust gases. The NO, NO2, and NOx concentrations were analyzed in real time on stream during the cold-WHTC, hot-WHTC, and WHSC mode tests, and the NO2/NOx ratio was confirmed according to the cDPF structure. This study indicates the possibility of develo** a stable diesel exhaust after-treatment system via passive regeneration by improving the BPT performance, exhaust gas reduction efficiency, and NO2/NOx ratio according to the structure of the cDPF.

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Abbreviations

CPSI:

cells per square inch, cell/in2

D:

diameter, inch

L:

length, inch

V:

volume, liter

CTE:

coefficient of thermal expansion, m/(m·K)

BPT:

balance point temperature, °C

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Acknowledgement

This research was funded by the Center for Environmentally Friendly Vehicle (CEFV) as the Global-Top Project of the Ministry of Environment, Korea (KMOE).

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Authors and Affiliations

  1. Department of Chemical and Biological Engineering, Korea University, Seoul, 02841, Korea

    Duck-kyu Oh & Kwan-Young Lee

  2. EcoMaster Ltd., 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Korea

    Jong-Soo Park

  3. Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Korea

    Duck-kyu Oh, Ahyun Ko, Youngmin Woo & Jong-Soo Park

  4. Center for Environmentally Friendly Vehicle, Korea Institute of Energy Research, 152 Gajeong-ro, Daejeon, 34129, Korea

    Young-Jae Lee

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  1. Duck-kyu Oh
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  2. Ahyun Ko
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  4. Young-Jae Lee
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Correspondence to Jong-Soo Park.

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Oh, Dk., Ko, A., Woo, Y. et al. Passive Regeneration Characteristics of a DOC/Asymmetric-CDPF System for Heavy-Duty Diesel Engines. Int.J Automot. Technol. 23, 471–479 (2022). https://doi.org/10.1007/s12239-022-0043-9

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  • DOI: https://doi.org/10.1007/s12239-022-0043-9

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