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B. Geringer, T. Lauer, J. Graf, H. Rottengruber:
"FVV-CO2-Research Program "Downsizing with Bio Fuels"- subproject "Innovative Ignition"";
Talk: Aachen Colloquium China, Beijing (invited); 2011-11-01 - 2011-11-02; in: "1st Aachen Colloquium China", (2011), 23 pages.

By combining downsizing, turbo-charging, fuel direct injection and blending with alternative, knock-proof bio fuels, the optimization of fuel consumption and therefore reduction of C02-emissions can be realized in a gasoline engines. The application of these technologies determines higher gas densities in the combustion chamber and thus intensified requirements of the ignition system regarding ignition energy, ignition voltage and the possibility of multiple sparks. Within the framewerk of the FW-C02- Research Program project cluster "Downsizing Bio Fuels" the subproject "Innovative lgnition" is defined. lt aims the finding of appropriate ignition systems.
A Iiterature research with a weighted evaluation according to the defined requirements resulted in the following short term ignition systems as alternatives to the standard Coil lgnition: Multispark lgnition System (MCI/MSI), Corona lgnition System (ECCOS) and High Energy lgnition System (DEIS).
First investigations of the ignition behavior in a closed combustion chamber showed advantages for the Multiple Spark lgnition System and an energy-strong form of the Coil lgnition. Rapid ignition of a large volume of gas could be detected due to the corona ignition system in several positions of the methane-air mixture. At high filling pressures in the combustion bomb the mixture could not be ignited by the corona system at that time.
Optical, thermodynamical and numerical investigations of ignition on a single-cylinder research-engine were accomplished. The corona ignition system as weil as the transistor coil ignition system with increased power could convince in part Ioad operating points at high charge dilution.
ln the last part of the project, the selected ignition systems have been tested at a highly-supercharged four-cylinder downsized engine with gasoline direct injection. At fullload, the stability of the corona igniter regarding glow ignition was not yet given.
Based on the findings from this research project it can be recommended the transistor coil ignition system with increased power as the most promising ignition system and as a further option, the next generation of corona ignition for supercharged downsized engines.