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- W2269947326 abstract "In direct-injection gasoline (GDI) engines with charge stratification, minimizing engine-out nitrogen oxide (NO x ) emission is crucial since exh ust-gas aftertreatment tolerates only limited amounts of NO x . Reduced NO x 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, O 2 and CO 2 are utilized to select an appropriate detection scheme for quantitative NO measurements under realistic conditions. CO 2 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)." @default.
- W2269947326 created "2016-06-24" @default.
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- W2269947326 date "2004-06-08" @default.
- W2269947326 modified "2023-09-26" @default.
- W2269947326 title "NO Laser-Induced Fluorescence Imaging in the Combustion Chamber of a Spray-Guided Direct-Injection Gasoline Engine" @default.
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- W2269947326 doi "https://doi.org/10.4271/2004-01-1918" @default.
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