10th Symposium "The Working Process of the Internal Combustion Engine"
Combustion Systems for CNG-SI Engines
Authors
Fabian Fricke, Lehrstuhl für Verbrennungskraftmaschinen Aachen, RWTH Aachen, Oliver Lang, Knut Habermann, Oliver Rütten, FEV Motorentechnik GmbH, Aachen
Year
2005
Summary
Compressed natural gas (CNG), inherently due to the specifications, represents an interesting short-term alternative to gasoline fuel. That are the 25 % lower CO2-emission, the high knock resistance, the long term availability, and last but not least the fuel cost that make this fuel additionally attractive to the consumer. With regard to the customer acceptance, actual development work focuses on the optimisation of bi-fuel concepts. For example, in SI engines fuel specific drawbacks of CNG compared to gasoline can partly be compensated by optimisation of the combustion system. Moreover, engine boosting offers high potential for the further development of CNG powertrains. As outlook for future CNG-concepts, lean burn with high boost offers CO2-saving potential of up to 50 % compared to today´s conventional gasoline engines.
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