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.
Reduction of Ammonia Emission using Deceleration Cylinder Cutoff in a Gasoline Spark Ignition Engine
Sae Int. J. Adv. and Curr. Prac. in Mobility
WCX SAE World Congress Experience ; 2022
Sae International Journal of Advances and Current Practices in Mobility ; 4 , 5 ; 1782-1787
2022-03-29
6 pages
Conference paper
English
Reduction of Ammonia Emission using Deceleration Cylinder Cutoff in a Gasoline Spark Ignition Engine
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