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The Potential of Fuel Metering Control for Optimising Unburned Hydrocarbon Emissions in Diesel Low Temperature Combustion
Technical Paper
2013-01-0894
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Low temperature combustion (LTC) in diesel engines offers
attractive benefits through simultaneous reduction of nitrogen
oxides and soot. However, it is known that the in-cylinder
conditions typical of LTC operation tend to produce high emissions
of unburned hydrocarbons (UHC) and carbon monoxide (CO), reducing
combustion efficiency. The present study develops from the
hypothesis that this characteristic poor combustion efficiency is
due to in-cylinder mixture preparation strategies that are
non-optimally matched to the requirements of the LTC combustion
mode. In this work, the effects of three key fuel path parameters -
injection fuel quantity ratio, dwell and injection timing - on CO
and HC emissions were examined using a Central Composite Design
(CCD) Design of Experiments (DOE) method. The experiments were
performed on a single-cylinder diesel research engine operating in
a high-EGR mixing-controlled LTC mode (EGR ~ 62%, intake O₂ = 8.5%)
with a split fuel injection for all conditions.
The experiments identified the potential of fuel metering
control for optimizing HC emissions in LTC by showing the effects
of fuel control parameters on fuel mixing quality and emission
formation mechanisms. The experimental results at this high-EGR
operating condition were shown to be highly sensitive to the intake
oxygen level. Accordingly, the use of DOE methods was found to be
essential to this study. The detailed statistical analysis enabled
by the experimental design was able to model and correct for the
substantial effects of normal variability in the input oxygen mass
fraction noted under these high EGR conditions; thus, permitting a
reliable comparison of results.
Authors
Topic
Citation
Sogbesan, O., Davy, M., and Garner, C., "The Potential of Fuel Metering Control for Optimising Unburned Hydrocarbon Emissions in Diesel Low Temperature Combustion," SAE Technical Paper 2013-01-0894, 2013, https://doi.org/10.4271/2013-01-0894.Also In
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