Visualization of soot formation in a DISI engine for different
fuel injection strategies and in cold start conditions with the aid
of endoscopic color imaging
Stefan Seefeldt, Joachim Deppe - LaVision GmbH, Goettingen,
GermanyJuergen Pfeil, Christian Disch, Thomas Koch - IFKM KIT,
Karlsruhe, Germany
Anna Glodek, Radoslaw Boba - CASP System, Jaworzno, Poland
References:[1] Disch, C., Kubach, H., Pfeil, J., Koch, T.,
Spicher, U., Thiele, O., Donn, C., Schyr, C.,”Cycle-resolved
combustion diagnostics of a direct injection gasoline engine in
transient operation,” 11th International Symposium on Combustion
Diagnostics, 2014[2] Disch, C., Pfeil, J., Kubach, H., Koch, T.,
Spicher, U., Thiele, O., ”Experimentelle Untersuchungen zur
Entwicklung des kurbelwinkelaufgelösten Brennraumluftverhältnisses
im Transientbetrieb eines Ottomotors mit Direkteinspritzung“,
published in Ladungswechsel im Verbrennungsmotor, 7.MTZ-Fachtagung,
2014[3] Disch, C., Pfeil, J., Kubach, H., Koch, T., Spicher, U.,
Thiele, O., ” Experimental Investigations of a DISI Engine in
Transient Operation with Regard to Particle and Gaseous Engine-out
Emissions “, JSAE 201509125, 2015.
FOCUS ON IMAGING
Full cycle analysis: Spray, Ignition and Combustion, applied on
a 6-cylinder GDI engine
Endoscopic Imaging: Setup EngineMaster inspex
USTA EH MX IE S SL IA ON NO SI T SA YN MR PE OT SNI I UH MT5
IOOOOONN Trends in automo�ve emissions, fuels, lubricants,
legisla�on
and test methods - a global view, with a focus on the EU &
US
Spray analysis: Variation of start of injection (SOI)
Soot formation as a direct result of piston wetting during fuel
injection at early SOI
Contribution of individual combustion cycles to cold-start soot
emissions
Motivation:in cylinder visualization of soot formation under
transient operationinteraction of spray and combustion within
individual cycles with the aid of high-speed crank angle resolved
image recordingintuitive soot visualization with colour imaging
Engine-in-the-Looptest bed setup:Coupling of a GDI 6-cylinder
in-line engine with a 3D vehicle model for virtual test drive
digital camera
camera endoscope
sealinginserts
crank angle encoder
lightsource engine illumination unit
engine synchronization unit
laptop computerwith DaVis
l t t
Fired cycle #1 Crank angle locked recording at 25°CA aTDC
Soot formation near cold walls
#2 #3
Clean combustion
#4
Images at SOI +6°CA
Early SOIStandard SOI
Fuel spray impingement on piston
Combustion in same cycle shows soot formation on piston head
This poster shows results of the project „Investigation of
Mixture Formation, Combustion Process and Emissions Generation in
Transient Operation of a Direct Injection Spark Ignition Engine.“
The authors wish to thank the German Environmental Foundation (DBU)
for funding this research project.
Acknowledgement:
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