NO laser-induced fluorescence imaging in the combustion chamber of a spray-guided direct-injection gasoline engine

G. Suck, J. Jakobs, S. Nicklitzsch, T. Lee, W. G. Bessler, M. Hofmann, F. Zimmermann, C. Schulz

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In direct-injection gasoline (GDI) engines with charge stratification, minimizing engine-out nitrogen oxide (NOx) emission is crucial since exhaust-gas aftertreatment tolerates only limited amounts of NOx. Reduced NOx production directly lowers the frequency of energy-inefficient catalyst regeneration cycles. In this paper we investigate NO formation in a realistic GDI engine. Quantitative in-cylinder measurements of NO concentrations are carried out via laser-induced fluorescence imaging with excitation of NO (A-X(0,2) band at 248 nm), and subsequent fluorescence detection at 220-240 nm. Engine modifications were kept to a minimum in order to provide results that are representative of practical operating conditions. Optical access via a sapphire ring enabled identical engine geometry as a production line engine. The engine is operated with commercial gasoline ("Super-Plus", RON 98). Recent high-pressure spectroscopic studies of NO, O2 and CO2 are utilized to select an appropriate detection scheme for quantitative NO measurements under realistic conditions. CO2 UV light absorption data is used to correct for laser and signal attenuation. NO-LIF concentrations are compared to extractive measurements using a fast gas sampling valve (GSV). NO formation is investigated at different operating conditions such as variable exhaust gas recirculation (egr).

Original languageEnglish (US)
Title of host publicationFuels and Lubricants Meeting and Exhibition
PublisherSAE International
ISBN (Print)0768013194, 9780768013191
StatePublished - 2004
Externally publishedYes
EventFuels and Lubricants Meeting and Exhibition - Toulouse, France
Duration: Jun 8 2004Jun 10 2004


ConferenceFuels and Lubricants Meeting and Exhibition

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering


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