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Reduction of Ammonia Emission using Deceleration Cylinder Cutoff in a Gasoline Spark Ignition Engine

Journal Article
2022-01-0537
ISSN: 2641-9645, e-ISSN: 2641-9645
DOI: https://doi.org/10.4271/2022-01-0537
Published March 29, 2022 by SAE International in United States
Reduction of Ammonia Emission using Deceleration Cylinder Cutoff in a Gasoline Spark Ignition Engine
Sector:
Citation: luo, X., Yang, X., Wilcutts, M., and Ortiz-Soto, E., "Reduction of Ammonia Emission using Deceleration Cylinder Cutoff in a Gasoline Spark Ignition Engine," SAE Int. J. Adv. & Curr. Prac. in Mobility 4(5):1782-1787, 2022, https://doi.org/10.4271/2022-01-0537.
Language: English

Abstract:

The newly proposed Euro 7 emission standards have added regulations limiting ammonia emissions for gasoline vehicles. This paper proposes a new emissions-control strategy to satisfy the regulated ammonia emission levels, using deceleration cylinder cut-off (DCCO) to reduce or eliminate conventional deceleration fuel cutoff (DFCO) and the associated lean-rich excursions in the three-way catalyst during oxygen saturation and desaturation. The improved air-fuel ratio management closer to stoichiometry lowers the ratio of CO to NOx and thus the ammonia (NH3) formation rate inside catalytic converter. Tests show more than 80% reduction of ammonia emission on the WLTC drive cycle without increasing other regulated emissions.

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