![]() The sensor was capable of probing four separate measurement locations simultaneously, and independently analyzing EGR fraction at speeds of 5 kHz (1.2 crank-angle degree (CAD) at 1 k RPM) or faster with high accuracy. The laser was tuned to an absorption band of carbon dioxide (CO 2), a standard exhaust-gas marker, near 2.7 µm. An absorption-based laser diagnostic was developed to study spatiotemporal charge-gas distributions in an IC engine intake manifold in real-time. Precise knowledge and fine control over the EGR system is thus crucial, particularly for optimizing advanced engine concepts such as reactivity controlled compression more » ignition (RCCI). However, cylinder-to-cylinder and cycle-to-cycle variations in the charge-gas uniformity can be a major barrier to optimum EGR implementation on multi-cylinder engines, and can limit performance, stability, and efficiency. One effective solution to reducing emissions of mono-nitrogen oxides (NO x) is exhaust gas recirculation (EGR), which has been widely implemented in modern vehicles. The need for more environmentally friendly and efficient energy conversion is of paramount importance in developing and designing next-generation internal combustion (IC) engines for transportation applications. Fuels, Engines and Emissions Research Center (FEERC) Sponsoring Org.: USDOE Office of Energy Efficiency and Renewable Energy (EERE) OSTI Identifier: 1326467 Grant/Contract Number: AC05-00OR22725 Resource Type: Accepted Manuscript Journal Name: Applied Spectroscopy Additional Journal Information: Journal Volume: 69 Journal Issue: 9 Journal ID: ISSN 0003-7028 Publisher: Society for Applied Spectroscopy Country of Publication: United States Language: English Subject: 33 ADVANCED PROPULSION SYSTEMS 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION EGR Probe engine exhaust-gas recirculation mixing absorption mid-infra-red light emitting diode intake = , Publication Date: Research Org.: Oak Ridge National Lab. Cummins Inc., Columbus, IN (United States).National Transportation Research Center, Fuels, Engines, and Emissions Research Center The calibrated probe was used to map spatial EGR distributions in an intake manifold with high accuracy and monitor cycle-resolved cylinder-specific EGR fluctuations at a rate of up to 1 kHz. ![]() Our study employed mid-infrared light sources tuned to an absorption band of CO 2 near 4.3 μm, an industry standard species for determining EGR fraction. The probe promotes the development of more efficient and higher-performance engines by resolving high-speed in situ CO 2 concentration at various locations in the intake manifold. Furthermore, a sensor packaged into a compact probe was designed, built and applied to measure spatiotemporal EGR distributions in the intake manifold of an operating engine. But, insufficient mixing between fresh air and exhaust gas can lead to cycle-to-cycle and cylinder-to-cylinder nonuniform charge gas mixtures of a multi-cylinder engine, which can in turn reduce engine performance and efficiency. ![]() One effective method of reducing NO x emissions while improving efficiency is exhaust gas recirculation (EGR) in internal combustion engines.
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