CATEGORY: DIESEL
J. Eng. Gas Turbines Power 136(9), 091503 (Mar
21, 2014) (7 pages)Paper No: GTP-14-1112; doi: 10.1115/1.4026929
Study
of Cylinder Charge Control for Enabling Low Temperature Combustion in Diesel Engines
Prasad Divekar University of Windsor, 401 Sunset
Avenue, Windsor, ON N9B 3P4, Canada e-mail: divekar@uwindsor.ca
Usman Asad University of Windsor, 401 Sunset Avenue, Windsor, ON N9B 3P4,
Canada e-mail: uasad@uwindsor.ca
Xiaoye Han University of Windsor, 401 Sunset Avenue, Windsor, ON N9B 3P4,
Canada e-mail:
hanz@uwindsor.ca
Xiang Chen University of Windsor, 401 Sunset Avenue, Windsor, ON N9B 3P4,
Canada e-mail: xchen@uwindsor.ca
Ming Zheng University of Windsor, 401 Sunset Avenue, Windsor, ON N9B 3P4,
Canada e-mail: mzheng@uwindsor.ca
Abstract
Appropriate
cylinder charge preparation is critical for achieving a highly homogeneous,
diluted, and lean cylinder charge, which lowers the flame temperature. The
resulting low temperature combustion (LTC) can simultaneously reduce NOx and
soot emissions from diesel engines. This requires sophisticated coordination of
multiple control systems for controlling the intake boost, exhaust gas
recirculation (EGR), and fueling events.
In addition, the cylinder charge modulation becomes more complicated
in the novel combustion concepts that apply port injection of low reactivity
alcohol fuels to replace the diesel fuel partially or entirely. Researchers
conducted experiments on a single cylinder research engine with diesel and
ethanol fuels. The test platform is able to independently control the intake
boost, EGR rates, and fueling events. They studied the effects of these control
variables with diesel direct injection and a combination of diesel direct
injection and ethanol port injection. They analyzed the data to determine the
control requirements for stable operation at various engine load levels with
the use of one or two fuels. The sensitivity of the combustion modes was
analyzed with regard to the boost, EGR, fuel types, and fueling strategies.
They propose development of a real-time boost-EGR set-point determination to
sustain the LTC mode at the varying engine load levels and fueling strategies.
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