Abstract

Future emission regulations for internal combustion engines require increasingly stringent reductions of engine-out emissions, especially NOx and particulate matter (PM), together with the continuous improvement of engine efficiency. In the current scenario, even though compression-ignited engines are still considered the most efficient and reliable technology for automotive applications, the use of diesel-like fuels has become a critical issue, since it is usually not compatible with the required emissions reduction. A large amount of research and experimentation is being carried out to investigate the combined use of compression-ignited engines and gasoline-like fuels, which proved to be very promising, especially in case the fuel is directly injected in the combustion chamber at high pressure. This work investigates the combustion process occurring in a light-duty compression-ignited engine while directly injecting only gasoline. A specific experimental setup has been designed to guarantee combustion stability over the whole operating range that is achieved controlling boost pressure and temperature together with all the injection parameters of the multijet pattern. The analysis of the experimental data clearly highlights how the variation of the control parameters affect the ignition process of small amounts of directly injected gasoline and the maximum achievable efficiency. In particular, the analysis of the sensitivity to the injection parameters allows identifying an ignition delay model and the key control parameters that might be varied to guarantee a robust control of combustion phasing within the cycle.

References

References
1.
Torregrosa
,
A. J.
,
Broatch
,
A.
,
García
,
A.
, and
Mónico
,
L. F.
,
2013
, “
Sensitivity of Combustion Noise and NOx and Soot Emissions to Pilot Injection in PCCI Diesel Engines
,”
Appl. Energy
,
104
, pp.
149
157
.10.1016/j.apenergy.2012.11.040
2.
Kolbeck
,
A. F.
,
2011
, “
Closed Loop Combustion Control—Enabler of Future Refined Engine Performance Regarding Power, Efficiency, Emissions and NVH Under Stringent Governmental Regulations
,”
SAE
Technical Paper No. 2011-24-0171. 10.4271/2011-24-0171
3.
Curran
,
S.
,
Hanson
,
R.
,
Wagner
,
R.
, and
Reitz
,
R.
,
2013
, “
Efficiency and Emissions Mapping of RCCI in a Light-Duty Diesel Engine
,”
SAE
Technical Paper No. 2013-01-0289. 10.4271/2013-01-0289
4.
Wissink
,
M.
, and
Reitz
,
R.
,
2015
, “
Direct Dual Fuel Stratification, a Path to Combine the Benefits of RCCI and PPC
,”
SAE Int. J. Engines
,
8
(
2
), pp.
878
889
.10.4271/2015-01-0856
5.
Li
,
C.
,
Xu
,
L.
,
Bai
,
X.-S.
,
Tunestal
,
P.
, and
Tuner
,
M.
,
2018
, “
Effect of Piston Geometry on Stratification Formation in the Transition From HCCI to PPC
,”
SAE
Technical Paper No. 2018-01-1800. 10.4271/2018-01-1800
6.
Dempsey
,
A. B.
,
Curran
,
S. J.
, and
Wagner
,
R. M.
,
2016
, “
A Perspective on the Range of Gasoline Compression Ignition Combustion Strategies for High Engine Efficiency and Low NOx and Soot Emissions: Effects of in-Cylinder Fuel Stratification
,”
Int. J. Engine Res.
,
17
(
8
), pp.
897
917
.10.1177/1468087415621805
7.
Kimura
,
S.
,
Aoki
,
O.
,
Kitahara
,
Y.
, and
Aiyoshizawa
,
E.
,
2001
, “
Ultra-Clean Combustion Technology Combining a Low-Temperature and Premixed Combustion Concept for Meeting Future Emission Standards
,”
SAE
Technical Paper No. 2001-01-0200. 10.4271/2001-01-0200
8.
Kokjohn
,
S.
,
Hanson
,
R.
,
Splitter
,
D.
, and
Reitz
,
R.
,
2009
, “
Experiments and Modeling of Dual-Fuel HCCI and PCCI Combustion Using in-Cylinder Fuel Blending
,”
SAE Int. J. Engines
,
2
(
2
), pp.
24
39
.10.4271/2009-01-2647
9.
Ravaglioli
,
V.
,
Ponti
,
F.
,
De Cesare
,
M.
,
Stola
,
F.
,
Carra
,
F.
, and
Corti
,
E.
,
2017
, “
Combustion Indexes for Innovative Combustion Control
,”
SAE Int. J. Engines
,
10
(
5
), pp.
2371
2381
.10.4271/2017-24-0079
10.
Masurier
,
J.
,
Waqas
,
M.
,
Sarathy
,
M.
, and
Johansson
,
B.
,
2018
, “
Autoignition of Isooctane Beyond RON and Mon Conditions
,”
SAE Int. J. Fuels Lubr.
,
11
(
4
), pp.
459
468
.10.4271/2018-01-1254
11.
Gentz
,
G.
,
Dernotte
,
J.
,
Ji
,
C.
, and
Dec
,
J.
,
2018
, “
Spark Assist for CA50 Control and Improved Robustness in a Premixed LTGC Engine Effects of Equivalence Ratio and Intake Boost
,”
SAE
Technical Paper No. 2018-01-1252. 10.4271/2018-01-1252
12.
An
,
Y.
,
Mubarak Ali
,
M. J.
,
Vallinayagam
,
R.
,
AlRamadan
,
A.
,
Sim
,
J.
,
Chang
,
J.
,
Im
,
H.
, and
Johansson
,
B.
,
2018
, “
Compression Ignition of Low Octane Gasoline Under Partially Premixed Combustion Mode
,”
SAE
Technical Paper No. 2018-01-1797. 10.4271/2018-01-1797
13.
Matsuura
,
K.
, and
Iida
,
N.
,
2018
, “
Effect of Temperature-Pressure Time History on Auto-Ignition Delay of Air-Fuel Mixture
,”
SAE
Technical Paper No. 2018-01-1799.10.4271/2018-01-1799
14.
Heywood
,
J. B.
,
1988
,
Internal Combustion Engine Fundamentals
,
McGraw-Hill
,
New York
.https://books.google.co.in/books/about/Internal_Combustion_Engine_Fundamentals.html?id=u9FSAAAAMAAJ
15.
Ravaglioli
,
V.
,
Ponti
,
F.
,
Carra
,
F.
, and
De Cesare
,
M.
, “
Heat Release Experimental Analysis for RCCI Combustion Optimization
,”
ASME
Paper No. ICEF2018-9714. 10.1115/ICEF2018-9714
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