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Experimental Investigation on the Influence of Boost on Emissions and Combustion in an SGDI-Engine Operated in Stratified Mode

Anders Johansson (Institutionen för tillämpad mekanik, Förbränning) ; Petter Dahlander (Institutionen för tillämpad mekanik, Förbränning)
SAE Technical Papers - 12th International Conference on Engines & Vechiles, 2015, Napoli (0148-7191). September, (2015)
[Konferensbidrag, refereegranskat]

Among many techniques used for increasing fuel efficiency of a modern Gasoline Direct-Injected (GDI) engine are boosting and stratified operation. In modern downsized GDI engines, boosting is standard in order to achieve a high power output. Boosted GDI-engines have however mostly been operated in homogenous mode and little is known on the effects of operating a boosted GDI-engine in stratified mode. This paper presents the influence on combustion , standard emissions and particulate size distribution in a Spray-Guided, Gasoline, Direct-Injected (SGDI), single cylinder, research engine operated with various levels of boost . The engine was operated in steady state mode at five engine operating points of various load and speed. The engine was boosted with a Roots blower and operated at four levels of boost as well as atmospheric pressure for comparison. The engine was fueled with market gasoline (95 RON) blended with 10% ethanol. The gas motion induced by the engine head was primarily tumble motion but a small amount of swirl. The spark plug and injector was mounted in parallel with the intake valves. Results indicate that exhaust temperature and NOx emissions decrease with increasing boost . Hydrocarbon emissions increase with increasing boost . The results on particulate emissions indicate that nucleation mode particulates increase with increasing boost . The opposite trend was observed for agglomeration mode particulates which decreased with increasing boost pressure.

Nyckelord: Stratified, SGDI, GDI, Boost, Particulates, Emissions, Gasoline, Direct Injection, DI



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Denna post skapades 2015-09-21. Senast ändrad 2016-03-23.
CPL Pubid: 222911

 

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