Autoignition on a Highly Supercharged Gasoline Engine and Preventive Measures

Authors

Dipl.-Ing. G. Prochazka, Dr. P. Hofmann, Univ.-Prof. Dr. B. Geringer, Technical University Vienna; Dipl.-Ing. J. Willand, Dr. C. Jelitto, Dipl.-Ing. O. Schäfer, Volkswagen AG, Wolfsburg

Year

2005

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 595

Summary

For a successful implementation of a downsizing-concept on a SI engine it is essential that high supercharging pressures and also high torques are available already at low engine speeds. During investigations with a supercharged 4-cylinder-gasoline engine autoignition occurred which prevented high boost rates at low engine speeds. By means of the application of optical measurement– and observation-techniques the reason for the autoignition could be found. A bad mixture formation which effected the formation of a fuel wall film in the combustion chamber was the cause. To effectively prevent the occurrence of autoignition, fuel wall film formation in the combustion needs to be avoided. This can be done by optimizing the mixture formation as well as the charge motion.

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