Abstract
The lower exhaust gas temperatures in hybrid vehicles can make it difficult to regenerate gasoline particulate filters (GPF). Filter regeneration technology using microwave (MW) heating has long been studied and for diesel particulate filter (DPF). In this study, a feasibility study was conducted to investigate the feasibility of filter regeneration by MW heating in a GPF, which has a different substrate material and catalyst material from DPFs. First, we demonstrated that particulate matter (PM) can be oxidized by MW heating with a test piece size GPF where heat transfer and MW intensity bias can be ignored. Next, we demonstrated that filter regeneration is possible even in the presence of heat dissipation and MW intensity bias using a full-size GPF, which is used in the market. These experiments showed that ambient temperature and MW power affect filter regeneration performance. On the other hand, when the filter was heated at high power to reduce the filter regeneration time, the PM oxidation caused thermal runaway, which resulted in high filter temperature and catalyst degradation. Furthermore, using numerical calculations, electromagnetic wave measurements, and visualization techniques, it was shown that the filter overheating was not caused by biased MW intensity, but by biased gas flow in the GPF due to biased GPF catalyst coatings and PM loading distribution. Finally, to achieve both thermal runaway prevention and filter regeneration performance, we proposed a filter regeneration strategy in which PM is oxidized with gradually increasing MW power; although thermal runaway prevention is possible, further improvement is needed in the future, since the results suggest that the filter regeneration time may increase. Based on the findings of this study, we believe that this MW heating-based GPF regeneration technology can contribute to carbon neutrality by overcoming the issue of the difficulty of regenerating GPF.
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Acknowledgements
We would like to thank Editage (www.editage.com) for English language editing. The authors acknowledge technical support from the members in Higashifuji Technical Centre in Toyota Motor Corporation and Soken Incorporated.
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Toru Uenishi: conceptualization, data curation, formal analysis, investigation, methodology, software, validation, visualization, funding acquisition, project administration, resources, supervision, and original draft; Kazuhiko Koike: data curation, formal analysis, investigation, methodology, validation, visualization, and writing—review and editing; Takumi Suzawa: data curation, formal analysis, investigation, methodology, validation, visualization, writing—review and editing.
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Uenishi, T., Koike, K. & Suzawa, T. Research on Regeneration Technology for Gasoline Particulate Filters Using Microwave Heating. Emiss. Control Sci. Technol. 10, 38–51 (2024). https://doi.org/10.1007/s40825-024-00239-2
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DOI: https://doi.org/10.1007/s40825-024-00239-2