New Test Procedure for the Determination of the LSPI-Stability of Current and Prospective Fuels

Authors

Dipl.-Ing. Nikola Bobicic, Assoc. Prof. Peter Hofmann, Univ. Prof. Bernhard Geringer, Institute for Powertrains and Automotive Technology, Vienna University of Technology, Vienna, Austria

Summary

Pre-ignition is a limiting factor in increasing of performance in turbocharged gasoline engines, with a high potential for damage. The fuel has a significant influence on the pre-ignition tendency of the engine. The established characteristic numbers (RON and MON) can only represent the resistance to knocking well, the pre-ignition behavior is not satisfactorily reproduced. Therefore, there are efforts in the automotive industry to define a test method in order to establish a test method with the least possible expenditure of time and fuel. In the project presented here, a test engine and a test methodology were developed. This was verified with a broad fuel matrix and some mechanisms of action could be shown. It turned out that it is not possible to predict the tendency to pre-ignite by chemical analysis of the fuel.

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