The Quality-Controlled Gasoline Engine – A Consistent Approach Exhibiting Potential for the Future

Authors

Dipl.-Ing. M. Kratzsch, Dipl.-Ing. M. Günther, Dipl.-Ing. S. Nicklitzsch, Dipl.-Ing. M. Medicke, IAV GmbH, Berlin / Chemnitz

Year

2011

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 735

Summary

The constantly increasing pressure to reduce CO2 emissions and naturally also the desire to offer customers a consistently economical concept prompts the automotive industry to utilize spark-ignition engine combustion even outside the statutory driving cycles. Up to now, development work on the spark-ignition engine focused primarily on avoiding throttling losses. Part of these losses are already avoided in VVL concepts, stratified charge engines or downsizing strategies. In theory, complete elimination of this share of the losses could improve consumption by 30 % at highly throttled operating points. Moreover, further potential is also available in reducing the real gas losses, described by the losses caused by combustion when taking account of real working air composition. These losses are caused by the isentropic exponent which is changed by pressure, temperature and working air properties and is thus smaller than k = 1.4 of the ideal air.

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