Partially premixed combustion has the potential of high efficiency and simultaneous low soot and NOx emissions. Running the engine in partially premixed combustion mode with high octane number fuels has the advantage of a longer premix period of fuel and air which reduces soot emissions, even at higher loads. The problem is the ignitability at low load and idle operating conditions. The objective is to investigate different multiple-injection strategies in order to further expand the low load limit and reduce the dependency on negative valve overlap in order to increase efficiency. The question is, what is the minimum attainable load for a given setting of negative valve overlap and fuel injection strategy. The experimental engine is a light duty diesel engine equipped with a fully flexible valve train system. The engine is run without boost at engine speed 800 rpm. The fuel is 87 RON gasoline. A turbocharger is typically used to increase the boost pressure, but at low engine speed and load the available boost is expected to be limited. The in-cylinder pressure and temperature around top-dead-center will then be too low to ignite high octane number fuels. A negative valve overlap can be used to extend the low engine speed and load operating region. But one of the problems with negative valve overlap is the decrease in gas-exchange efficiency due to heat-losses from recompression of the residual gases. Also, the potential temperature increase from the trapped hot residual gases is limited at low load due to the low exhaust gas temperature. In order to expand the low load operating region further, more advanced injection strategies are investigated.

References

References
1.
Willand
,
J.
,
Nieberding
,
R.
,
Vent
,
G.
, and
Enderle
,
C.
,
1998
, “
The Knocking Syndrome—Its Cure and Its Potential
,” SAE Technical Paper No. 982483.
2.
Lavy
,
J.
,
Dabadie
,
J.
,
Angelberger
,
C.
,
Duret
,
P.
,
Willand
,
J.
,
Juretzka
,
A.
,
Schäflein
,
J.
,
Ma
,
T.
,
Lendresse
,
Y.
,
Satre
,
A.
,
Schulz
,
C.
,
Krämer
,
H.
,
Zhao
,
H.
, and
Damiano
,
L.
,
2000
, “
Innovative Ultra-Low NOx Controlled Auto-Ignition Combustion Process for Gasoline Engines: The 4-SPACE Project
,”
SAE
Technical Paper No. 2000-01-1837.10.4271/2000-01-1837
3.
Kimura
,
S.
,
Aoki
,
O.
,
Ogawa
,
H.
,
Muranaka
,
S.
, and
Enomoto
,
Y.
,
1999
, “
New Combustion Concept for Ultra-Clean and High-Efficiency Small DI Diesel Engines
,”
SAE
Technical Paper No. 1999-01-3681.10.4271/1999-01-3681
4.
Akihama
,
K.
,
Takatori
,
Y.
,
Inagaki
,
K.
,
Sasaki
,
S.
, and
Dean
,
A. M.
,
2001
, “
Mechanism of the Smokeless Rich Diesel Combustion by Reducing Temperature
,”
SAE
Technical Paper No. 2001-01-0655.10.4271/2001-01-0655
5.
Yanigahara
,
H.
,
Sato
,
Y.
, and
Minuta
,
J.
,
1996
, “
A Simultaneous Reduction in NOx and Soot in Diesel Engines Under a New Combustion System (Uniform Bulky Combustion System—UNIBUS)
,”
17th International Vienna Motor Symposium
, Vienna, Austria, April, 25–26, pp.
303
314
.
6.
Hasegawa
,
R.
, and
Yanagihara
,
H.
,
2003
, “
HCCI Combustion in DI Diesel Engine
,”
SAE
Technical Paper No. 2003-01-0745.10.4271/2003-01-0745
7.
Kalghatgi
,
G.
,
Risberg
,
P.
, and
Ångström
,
H.
,
2006
, “
Advantages of Fuels With High Resistance to Auto-Ignition in Late-Injection, Low-Temperature, Compression Ignition Combustion
,”
SAE
Technical Paper No. 2006-01-3385.10.4271/2006-01-3385
8.
Kalghatgi
,
G.
,
Risberg
,
P.
, and
Ångström
,
H.
,
2007
, “
Partially Pre-Mixed Auto-Ignition of Gasoline to Attain Low Smoke and Low NOx at High Load in a Compression Ignition Engine and Comparison With a Diesel Fuel
,”
SAE
Technical Paper No. 2007-01-0006.10.4271/2007-01-0006
9.
Kalghatgi
,
G. T.
,
Hildingsson
,
L.
, and
Johansson
,
B.
,
2009
, “
Low NOx and Low Smoke Operation of a Diesel Engine Using Gasoline-Like Fuels
,”
ASME Internal Combustion Engine Division Spring Technical Conference
,
Milwaukee, WI
, May 3–6,
ASME
Paper No. ICES2009-76034, pp.
259
271
.10.1115/ICES2009-76034
10.
Kalghatgi
,
G. T.
,
Hildingsson
,
L.
,
Harrison
,
A.
, and
Johansson
B.
,
2010
, “
Low- NOx, Low-Smoke Operation of a Diesel Engine Using ‘Premixed Enough’ Compression Ignition—Effects of Fuel Autoignition Quality, Volatility and Aromatic Content
,”
THISEL 2010 Conference on Thermo- and Fluid Dynamic Processes in Diesel Engines
, Valencia, Spain, September 14–17.
11.
Manente
,
V.
,
Johansson
,
B.
,
Tunestal
,
P.
, and
Cannella
,
W.
,
2010
, “
Effects of Different Type of Gasoline Fuels on Heavy Duty Partially Premixed Combustion
,”
SAE Int. J. Eng.
,
2
(
2
), pp.
71
88
.10.4271/2009-01-2668
12.
Manente
,
V.
,
Zander
,
C.
,
Johansson
,
B.
,
Tunestal
,
P.
, and
Cannella
,
W.
,
2010
, “
An Advanced Internal Combustion Engine Concept for Low Emissions and High Efficiency From Idle to Max Load Using Gasoline Partially Premixed Combustion
,”
SAE
Technical Paper No. 2010-01-2198.10.4271/2010-01-2198
13.
Manente
,
V.
,
Johansson
,
B.
,
Tunestal
,
P.
,
Sonder
,
M.
, and
Serra
S.
,
2009
, “
Gasoline Partially Premixed Combustion: High Efficiency, Low NOx and Low Soot by Using an Advanced Combustion Strategy and a Compression Ignition Engine
,” Fuels and Combustion in Engines Conference (FCE'09), Istanbul, Turkey, October 8–9, pp. 169–184.
14.
Chartier
,
C.
,
Aronsson
,
U.
,
Andersson
,
Ö.
, and
Egnell
,
R.
,
2010
, “
Effect of Injection Strategy on Cold Start Performance in an Optical Light-Duty DI Diesel Engine
,”
SAE Int. J. Eng.
,
2
(
2
), pp.
431
442
.10.4271/2009-24-0045
15.
Borgqvist
,
P.
,
Tunestal
,
P.
, and
Johansson
,
B.
,
2012
, “
Gasoline Partially Premixed Combustion in a Light Duty Engine at Low Load and Idle Operating Conditions
,”
SAE
Technical Paper No. 2012-01-0687.10.4271/2012-01-0687
16.
Trajkovic
,
S.
,
Milosavljevic
,
A.
,
Tunestål
,
P.
, and
Johansson
,
B.
,
2006
, “
FPGA Controlled Pneumatic Variable Valve Actuation
,”
SAE
Technical Paper No. 2006-01-0041.10.4271/2006-01-0041
17.
Box
,
B. E. P.
,
Hunter
,
J. S.
, and
Hunter
,
W. G.
,
2005
,
Statistics for Experimenters: Design, Innovation, and Discovery
,
2nd ed.
,
Wiley-Interscience
,
New York
.
18.
Collin
,
R.
,
Nygren
,
J.
,
Richter
,
M.
,
Aldén
,
M.
,
Hildingsson
,
L.
, and
Johansson
,
B.
,
2004
, “
Studies of the Combustion Process With Simultaneous Formaldehyde and OH PLIF in a Direct-Injected HCCI Engine
,”
Proceedings of the Sixth International Symposium on Diagnostics and Modeling of Combustion in Internal Combustion Engines (COMODIA 2004)
,
Yokohama, Japan
, August 2–5, pp.
311
317
.
19.
Manente
,
V.
,
Johansson
,
B.
, and
Tunestal
,
P.
,
2009
, “
Characterization of Partially Premixed Combustion With Ethanol: EGR Sweeps, Low and Maximum Loads
,”
ASME 2009 Internal Combustion Engine Division Spring Technical Conference
, Milwaukee, WI
, May 3–6,
ASME
Paper No. ICES2009-76165.10.1115/ICES2009-76165
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