Knock with Exhaust Gas at Full Load
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Knocking combustion limits the efficiency of turbocharged SI engines at high loads.
This phenomenon can be inhibited by deploying recirculation of cooled exhaust gas. However, the development support for full load exhaust gas combustion systems with 0-D/1-D simulations is not yet expedient, as no reliable knock model exists which accounts for exhaust gas. In order to develop such a model, a new kinetic mechanism for gasoline surrogate fuels was developed and in parallel the effects of exhaust gas have been investigated experimentally with a single-cylinder research engine. Based on the measurement database and the new kinetic mechanisms, at the RWTH Aachen University and the University of Stuttgart a predictive knock model for 0-D simulation applications was developed and validated jointly as part of an FVV research project.
In order to optimize the efficiency of internal combustion engines, today many variations such as the compression ratio are used. In the gasoline...
This report is the scientific result of a completed research task undertaken by the Forschungsvereinigung Verbrennungskraftmaschinen e. V. (FVV, Frankfurt) under the number 6301 and processed by the RWTH Aachen University and the University of Stuttgart. We would like to thank the FVV Working Group chaired by Dr.-Ing. André Kulzer (Dr. Ing. h.c. F. Porsche AG) for their guidance.