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Maximizing Power Output in an Automotive Scale Multi-Cylinder Homogeneous Charge Compression Ignition (HCCI) Engine
Technical Paper
2011-01-0907
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Experimental investigations were conducted on a multi-cylinder
automotive scale HCCI engine in determining a strategy that yields
high power output, sufficient for passenger vehicles. A 1.9L
Volkswagen TDI, modified for HCCI operation, is used with a
compression ratio of 17:1 and boost pressures between 1.0 and 2.0
bar absolute. Various equivalence ratios and combustion times are
explored at 1800 RPM with commercial-grade gasoline. The effects of
exhaust backpressure that would be caused by a turbocharger in
production engines are also explored.
The results reveal that the highest power output can be achieved
with high boost pressures and high equivalence ratios, and highly
delayed combustion timing for controlling ringing. The optimal
power output conditions exist near the boundaries of ringing, peak
in-cylinder pressure, misfire and controllability. The results of
the highest power output condition are displayed for a single
cylinder; however, similar trends were seen across all four
cylinders of the HCCI engine. The maximum power output identified
in this study exceeded 9 bar gross IMEP, and high indicated
efficiency points (exceeding 40%) were also found. NOx
emissions were very low for all test points, well below US2010
standards. For different equivalence ratios and boost pressures,
detailed trends were explored for the effects of the various
controllable parameters upon power output, ringing, efficiency,
NOx, hydrocarbon and carbon monoxide emissions. For
multi-cylinder HCCI, the importance of individual cylinder control
is emphasized by showing that cylinders require different intake
temperatures for maintaining the same combustion timing. The
effects of coupled flow dynamics between cylinders is also
explored, particularly because at high power output conditions
disturbance propagations between cylinders can cause disturbances
from one cylinder to drive neighboring cylinders into unstable
combustion modes. Finally, the effects of exhaust backpressure are
discussed, and it is found that increasing exhaust backpressures
cause lower intake temperature requirements, however other engine
characteristics are largely unaffected by increasing exhaust
backpressure.
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Citation
Saxena, S., Chen, J., and Dibble, R., "Maximizing Power Output in an Automotive Scale Multi-Cylinder Homogeneous Charge Compression Ignition (HCCI) Engine," SAE Technical Paper 2011-01-0907, 2011, https://doi.org/10.4271/2011-01-0907.Also In
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