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Efficiency and Emissions Mapping of RCCI in a Light-Duty Diesel Engine
Technical Paper
2013-01-0289
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In-cylinder blending of gasoline and diesel to achieve
Reactivity Controlled Compression Ignition (RCCI) has been shown to
reduce NOX and particulate matter (PM) emissions while
maintaining or improving brake thermal efficiency as compared to
conventional diesel combustion (CDC). The RCCI concept has an
advantage over many advanced combustion strategies in that the fuel
reactivity can be tailored to the engine speed and load allowing
stable low-temperature combustion to be extended over more of the
light-duty drive cycle load range. Varying the premixed gasoline
fraction changes the fuel reactivity stratification in the cylinder
providing further control of combustion phasing and pressure rise
rate than the use of EGR alone. This added control over the
combustion process has been shown to allow rapid engine operating
point exploration without direct modeling guidance.
This paper explores the efficiency, emissions and combustion
characteristics of RCCI with gasoline and ultra-low sulfur diesel
fuel over a wide speed and load range in a light-duty
multi-cylinder diesel engine leading to the creation of an RCCI
engine map. The RCCI map was developed under self-imposed
constraints which included a maximum cylinder pressure rise rate of
10 bar/deg and a CO emission limit of 5000 ppm. The RCCI map was
developed using a mix of single and split diesel injections without
the use of EGR for best brake thermal efficiency with lowest
possible NOX emissions. RCCI emissions and performance results
are compared to CDC on the same base diesel engine.
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Citation
Curran, S., Hanson, R., Wagner, R., and Reitz, R., "Efficiency and Emissions Mapping of RCCI in a Light-Duty Diesel Engine," SAE Technical Paper 2013-01-0289, 2013, https://doi.org/10.4271/2013-01-0289.Also In
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