20th International Conference "Engine & Environment"
Variable Compression, for efficient Downsizing
Authors
Karsten Wittek, Knut Habermann, Christof Tiemann, FEV Motorentechnik GmbH, Stefan Pischinger, Dirk Adolph, Lehrstuhl für Verbrennungskraftmaschinen Aachen (VKA) der RWTH Aachen University
Year
2008
Summary
Downsizing through “high pressure boosting” can be seen as one of the most effective measures to improve an engine’s fuel economy. Additional potential for fuel consumption reduction can be opened up by fitting the downsized, highly boosted engine with a variable compression ratio (VCR) system. SI engines with a continuously variable compression ratio offer a fuel saving potential of approx. 8% in the NEDC. Diesel engines could also benefit from a VCR system, as it facilitates the finetuning of the combustion process at a simultaneous decrease in peak firing pressure.
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