Fast Catalyst Light-Off with Dynamic Skip Fire

Catalytic aftertreatment is commonly used to reduce regulated gas emissions from Internal Combustion (IC) engines. Achieving fast catalyst light-off has always been a challenge for automobile IC engine applications. This paper experimentally studied the thermal management and regulated gas emissions...

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Published in:SAE International journal of advances and current practices in mobility 2020-04, Vol.2 (4), p.1849-1861, Article 2020-01-0313
Main Authors: Luo, Xi, Hashemi, Sam, Subramanian, Ram, Arvanitis, Anastasios, Younkins, Matthew
Format: Article
Language:English
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Summary:Catalytic aftertreatment is commonly used to reduce regulated gas emissions from Internal Combustion (IC) engines. Achieving fast catalyst light-off has always been a challenge for automobile IC engine applications. This paper experimentally studied the thermal management and regulated gas emissions from a Spark Ignition (SI) engine with Dynamic Skip Fire (DSF®) technology during cold start period. The study has found that DSF can increase exhaust gas temperature at the catalyst inlet by up to 100°C, and the exhaust enthalpy by up to 20%. Cold start tailpipe carbon monoxide (CO) and hydrocarbon (HC) emissions can be reduced by 10% to 20% largely due to the increased exhaust gas temperature and enthalpy. Dynamic air pumping can further increase exhaust gas temperature by 30 °C, and can nearly double enthalpy delivered to the catalyst, which reduces cold start HC emissions by more than 50%.
ISSN:2641-9645
2641-9645
DOI:10.4271/2020-01-0313