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Full-Text Articles in Engineering
An Experimental Study Of A Passive Nox Adsorber (Pna) For The Reduction Of Cold Start Diesel Emissions, Conor Berndt
An Experimental Study Of A Passive Nox Adsorber (Pna) For The Reduction Of Cold Start Diesel Emissions, Conor Berndt
Dissertations, Master's Theses and Master's Reports
Medium and heavy-duty diesel engines contribute nearly a third of all NOx emissions nationwide. Further reduction of NOx emissions from medium and heavy-duty diesel engines is needed in order to meet National Ambient Air Quality Standards (NAAQS) for ambient particulate matter and ozone. Current diesel engine aftertreatment systems are very efficient at reducing NOx emissions at exhaust temperatures above 200 °C, however at exhaust temperatures below 200 °C there are significant NOx emissions at the tailpipe. Therefore, a reduction of diesel engine cold start and low speed/load operation emissions, where exhaust temperatures are below 200 °C, is needed. Utilizing a …
Cold Start Analysis And Modeling Of A Direct-Injection Gasoline Engine, Yash Borghate
Cold Start Analysis And Modeling Of A Direct-Injection Gasoline Engine, Yash Borghate
Dissertations, Master's Theses and Master's Reports
In this thesis, two different works related to cold start of a direct-injection (DI) gasoline engine are shown. First, effect of split injection is studied on engine exhaust temperature and hydrocarbon emissions for cold start conditions. Instead of single injection, two injections are done, one injection during the intake stroke and one injection during the compression stroke. Split injection is known to reduce jet wall wetting, thus reducing the hydrocarbon emissions from engine itself. Further, split injection reduces engine cycle-by-cycle variability with respect to the single injection case. Correlations between start of injection for the injection in the intake stroke …