The simultaneous reduction of fuel consumption and pollutant emissions, namely NOx and soot, is the predominant goal in modern engine development. In this context, low temperature combustion concepts are believed to be the most promising approaches to resolve the above mentioned conflict of goals. Disadvantageously these combustion concepts show high peak pressures or high rates of pressure rise due to early ignition and high reaction rates especially at high loads. Furthermore, there are still challenges in controlling combustion phasing. In this context using a small amount of pilot Diesel injected directly into the combustion chamber to ignite a highly diluted gasoline air mixture can overcome the aforementioned difficulties. As the gasoline does not ignite without the Diesel, the pilot injection timing can be used to control combustion phasing. By increasing dilution even high loads with low rates of pressure rise and without knocking are possible. This paper shows the results of experimental investigations carried out on a heavy duty boosted single cylinder Diesel engine. Based on the indicated cylinder pressure, the combustion process is characterised by performing knock analyses as well as thermodynamic analyses. Furthermore an optically accessible engine has been set up to investigate both the Diesel injection and the combustion process by means of digital high speed imaging. Together with the thermodynamic analyses the results of these optical investigations make up the base for the presented theoretical model of this combined Diesel gasoline combustion process. To show the load potential of this Dual-Fuel-CAI concept, the engine was operated at 2100 1/min with an IMEP of 19 bar. NOx emissions did not exceed 0.027 g/kWh.
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ASME 2011 Internal Combustion Engine Division Fall Technical Conference
October 2–5, 2011
Morgantown, West Virginia, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-4442-7
PROCEEDINGS PAPER
Controlling Gasoline Low Temperature Combustion by Diesel Micro Pilot Injection
Johannes Eichmeier,
Johannes Eichmeier
Karlsruhe Institute of Technology, Karlsruhe, Germany
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Uwe Wagner,
Uwe Wagner
Karlsruhe Institute of Technology, Karlsruhe, Germany
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Ulrich Spicher
Ulrich Spicher
Karlsruhe Institute of Technology, Karlsruhe, Germany
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Johannes Eichmeier
Karlsruhe Institute of Technology, Karlsruhe, Germany
Uwe Wagner
Karlsruhe Institute of Technology, Karlsruhe, Germany
Ulrich Spicher
Karlsruhe Institute of Technology, Karlsruhe, Germany
Paper No:
ICEF2011-60042, pp. 361-372; 12 pages
Published Online:
February 3, 2012
Citation
Eichmeier, J, Wagner, U, & Spicher, U. "Controlling Gasoline Low Temperature Combustion by Diesel Micro Pilot Injection." Proceedings of the ASME 2011 Internal Combustion Engine Division Fall Technical Conference. ASME 2011 Internal Combustion Engine Division Fall Technical Conference. Morgantown, West Virginia, USA. October 2–5, 2011. pp. 361-372. ASME. https://doi.org/10.1115/ICEF2011-60042
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