Modeling on a Three-Way Catalyst Used in Series Hybrid Electric Vehicles Focusing on Its Catalytic Behavior at Cold Start

Toshinori Okajima*, Suchitra Sivakumar, Hajime Shingyouchi, Kyohei Yamaguchi, Jin Kusaka, Makoto Nagata

*この研究の対応する著者

研究成果: Article査読

1 被引用数 (Scopus)

抄録

Exhaust gas from series hybrid electric vehicle (SHEV) engines has characteristics different from those of conventional gasoline and parallel HEVs because there is a trend of iterated intermittent steady-state engine operation at a specific high-efficiency point and engine stop. A catalyst model that can reproduce the purification performance of a close-coupled three-way catalyst against the distinctive emissions of SHEVs was previously developed; however, improving the estimation accuracy in the period from a cold start to the completion of the light-off process remains challenging. To overcome this issue, the redox behavior of Rh was investigated in this study. After transient mode tests, the catalyst surface was oxidized due to exposure to high temperatures and an oxidative atmosphere for some time, causing activation deterioration. The activation promoted through light-off from the deteriorated state at cold start was modeled by introducing a rate equation with Arrhenius form to express the activation process. The completed model reproduced the performance trend in lean and rich iteration tests in a model gas experiment and achieved favorable estimation accuracy in worldwide light-duty test cycle mode calculation.

本文言語English
ページ(範囲)14069-14086
ページ数18
ジャーナルIndustrial and Engineering Chemistry Research
60
39
DOI
出版ステータスPublished - 2021 10月 6

ASJC Scopus subject areas

  • 化学 (全般)
  • 化学工学(全般)
  • 産業および生産工学

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