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Multiple Injection in a Mixed Mode GDI Boosted Engine
Technical Paper
2010-01-1496
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A numerical investigation is performed with the aim of
understanding the potential benefits of multiple injections in the
mixed mode boosting operation of a Gasoline Direct Injection (GDI)
engine. The study is carried out by firstly characterizing a high
pressure multi-hole injector from the experimental point of view in
the split injection operation. Measurements of the fuel injection
rate are made through an AVL Meter operating on the Bosch
principle. The injector is tested using gasoline in a double pulse
strategy. The injection pressure is varied between 5.0 and 25.0 MPa
with the pulse durations calibrated for delivering a total mass up
to 50 mg/str. The choice of the dwell time between two successive
injection events is achieved by firstly defining the minimum time
compatible with the mechanical characteristics of both the injector
and the injector driver. While the GDI injector driver is able to
generate a proper trigger current without limitations on the
duration of the time between consecutive injections, a current
command with a too low dwell time would make for the injected fuel
to not be split in two separate events.
The multidimensional modeling of the in-cylinder processes is
realized within the AVL FIRE™ code environment. Gasoline
injection is simulated by resorting to a properly developed model
that uses measured injection mass flow rates and accounts for the
dependence of the initial droplets size distribution upon injection
pressure. It is shown that high-speed high-load conditions do not
benefit of splitting injection, whereas two injection events are
useful for improving the quality of mixture stratification at
moderate-speed moderate-load conditions. The choice of the dwell
time between two successive injections is crucial.
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Authors
Citation
Costa, M., Allocca, L., Montanaro, A., Sorge, U. et al., "Multiple Injection in a Mixed Mode GDI Boosted Engine," SAE Technical Paper 2010-01-1496, 2010, https://doi.org/10.4271/2010-01-1496.Also In
References
- Patent N° 7415348 B1 - Multiple Injection Blend For Direct Injected Engines Assignee GM Global Technology Operation, Inc. Detroit, MI (US)
- Kuwahara, K. Ueda, K. Ando, H. “Mixing Control Strategy for Engine Performance Improvement in a Gasoline Direct Injection Engine,” SAE Technical Paper 980158 1998
- Arcoumanis C. C. Kamimoto T. Flow and Combustion in Reciprocating Engines 10.1007/978-3-540-68901-03 Springer-Verlag Berlin Heidelberg 2008
- Costa, M. Iorio, B. Sorge, U. Giglio, V. et al. “Numerical Study of a GDI Engine Operating in the Jet Guided Combustion Mode,” SAE Technical Paper 2009-24-0021 2009
- Costa, M. Iorio, B. Sorge, U. Alfuso, S. “Assessment of a Numerical Model for Multi-Hole Gasoline Sprays to be Employed in the Simulation of Spark Ignition GDI Engines with a Jet-Guided Combustion Mode,” SAE Technical Paper 2009-01-1915 2009
- Fritsching U. Spray Simulation 10.2277/0521820987 Cambridge University Press 2004
- Liu H. Science and Engineering of Droplets: Fundamentals and Applications 10: 0815514360 William Andrew 2000
- Alfuso, S. Allocca, L. Greco, M. Montanaro, A. Valentino, G. “Time- and Space-Characterization of Multi-hole GDI Sprays for IC Engines by Images Processing and PDA Techniques,” Paper ILASS08-071 2008
- Bosch, W. “The Fuel Rate Indicator: A New Measuring Instrument for Display of the Characteristics of Individual Injection,” SAE Technical Paper 660749 1966
- Dukowicz, J.K. “A particle-fluid numerical model for liquid sprays,” J. Comp. Physics 35 229 253 1980
- Huh, K.Y. Gosman, A.D. “A phenomenological model of diesel spray atomisation,” International Conference on Multiphase Flows 1991 Tsukuba, Japan 1991
- Bozza, F Torella, E. “The employment of a 1D simulation model for the A/F ratio control in a VVT Engine” SAE Transactions, Journal of Engines 3 2004