The development of the fleet fuel consumption shows a remarkable decrease over the past years. Nonetheless, there is still a way to go in order to reach the ambitious CO2 goals set by the European Union. Besides the electrification and hybridization of the power train, there is a significant potential for fuel consumption reduction. New combustion systems and improvements in charging and EGR cooling allow for downsizing of Diesel engines. CO2 reduction can be achieved and NO(x) emissions fulfill the Euro 5+ limits at the same time. On the Gasoline side, downsizing in combination with direct injection gives potential for fuel consumption reduction. Alternative fuels can also offer opportunities. Friction reduction and thermal management are effective measures for fuel consumption reduction for both Diesel and Gasoline engines. The paper gives an overview on different approaches for Gasoline and Diesel engines as well as general trends in mechanical development for friction improved IC engines. High-tech solutions like 2-stage TC, intensified EGR cooling and upgraded FIE are additional measures for the Diesel engine, dethrottling by VVT or cylinder deactivation, lean burn and alternative fuels are additional measures for the Gasoline engine. Many of the discussed technologies for highly efficient internal combustion engines are not totally new, but only today the high pressure from the market side allows the realization. They will lead to a significant contribution to CO2 reduction from the combustion engine side.
SI & CI ICE challenges in CO2 scenario
2008
16 Seiten, 16 Bilder, 6 Quellen
Conference paper
English
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