Using Fuel Figures to Evaluate Pre-ignition in Gasoline Engines
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Due to the increasing power density of modern downsized gasoline engines, they sporadically exhibit combustion anomalies, known as pre-ignition, particularly in the low-end torque region. In addition to the variety of causes of pre-ignition the fuel plays an essential role in this regard. As part of a cooperative FVV project, two experimental methods have been developed at the Vienna University of Technology and the RWTH Aachen University, which evaluate the pre-ignition resistance of a fuel due to thermodynamically critical conditions in the gas phase.
The combination of direct injection, downsizing and turbocharging in gasoline engines has gained acceptance in recent years as a globally deployable technology for achieving the required reductions in consumption. Using biofuels also offers significant potential for further CO2reduction and is increasingly becoming the focus of research and development. Both optimization paths, biofuels and downsizing, lead to new...
This article is the result of a completed research submission of Research Association for Combustion Engines e. V. (FVV, Frankfurt), which was prepared at the Institute for Powertrains and Automotive Technology (IFA) of the Vienna University of Technology under the direction of Prof. Dr.-Ing. Bernhard Geringer and at the Institute for Combustion Engines at the RWTH Aachen University under the direction of Prof. Dr.-Ing. Stefan Pischinger. We are grateful to the Fachagentur Nachwachsende Rohstoffe e. V., the FVV, the Fachverband der Fahrzeugindustrie Österreichs, Südzucker AG and Rofa Vienna for financial support and OMV AG for providing the comprehensive fuel matrix. Further thanks are due to Prof. Alexander Heufer, Junior Professor for the Physical and Chemical Foundations of Combustion at the RWTH Aachen for his technical support and participation as well as Dr.-Ing. Ulrich Kramer for leading the accompanying FVV working group.