This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Experimental Investigation of Fuel Consumption, Exhaust Emissions and Heat Release of a Small-Displacement Turbocharged CNG Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 03, 2006 by SAE International in United States
Annotation ability available
An experimental investigation of fuel consumption, exhaust emissions and heat release was performed on a prototype 1.2 liter 4 cylinder turbocharged CNG engine, which has been specifically developed and optimized in order to fully exploit natural gas potential. More specifically, the combination of a high CR of 10.1:1 and a Garrett high-performance turbocharger featuring selectable levels of boost produced a favorable efficiency map, with peak values exceeding 35%.
The experimental tests were carried out in order to assess the engine performance improvement attainable through turbocharging and to define the best control strategies for this latter. The investigation included ample variations of engine speed and load, RAFR as well as trade-offs between boost level and throttle position. At each test point, in-cylinder pressure, fuel consumption and ‘engine-out’ pollutant emissions, including methane unburned hydrocarbons concentration, were measured. The acquired data were then processed through a combustion diagnostic tool resulting from the integration of an original multizone heat-release model with a CAD procedure for the burned gas front geometry simulation.
Power density comparable to those of last-generation DI diesel engines were obtained at stoichiometric operations under retarded spark-timings and high boost levels. However, lean-burn operation gave the best fuel efficiency. Concerning the most efficient torque-based control strategy for the turbocharged engine, the best results were achieved by first operating the throttle valve with no boost and then, once WOT condition is reached, by increasing the boost pressure. This procedure allowed minimizing the pumping losses at each operating condition. Finally, based on the conversion efficiencies of 3-way catalytic converters, lean burn operation highlighted a significant increase in tailpipe emissions of methane unburned hydrocarbons and nitrogen oxides with respect to stoichiometric operations.
- M. Ferrera - Centro Ricerche Fiat
- C. Peletto - Centro Ricerche Fiat
- S. d'Ambrosio - ICE Advanced Laboratory - Dipartimento di Energetica, Politecnico di Torino
- E. Spessa - ICE Advanced Laboratory - Dipartimento di Energetica, Politecnico di Torino
- A. Vassallo - ICE Advanced Laboratory - Dipartimento di Energetica, Politecnico di Torino
Citationd'Ambrosio, S., Spessa, E., Vassallo, A., Ferrera, M. et al., "Experimental Investigation of Fuel Consumption, Exhaust Emissions and Heat Release of a Small-Displacement Turbocharged CNG Engine," SAE Technical Paper 2006-01-0049, 2006, https://doi.org/10.4271/2006-01-0049.
SI Combustion and Direct Injection SI Engine Technology
Number: SP-2016; Published: 2006-04-03
Number: SP-2016; Published: 2006-04-03
- Kato, K. Igarashi, K. Masuda, M. Otsubo, K. Yasuda, A. Takeda, K. Sato, T. “Development of Engine for Natural Gas Vehicle,” SAE SP-1436 ‘Combustion in SI Engines’ 52 60 1999
- Zhang, F.R. Okamoto, K. Morimoto, S. Shoji, F. “Methods of increasing the BMEP (Power Output) for Natural Gas Spark Ignition Engines,” SAE SP-1371 ‘Combustion Processes in Engines Utilizing Gaseous Fuels’ 11 19 1998
- Einewall, P. Johansson, B. “Combustion Chambers for Supercharged Natural Gas Engines,” SAE Paper No. 970221 1997
- Catania, A.E. Misul, D. Mittica, A. Spessa, E. “A Refined Two-Zone Heat Release Model for Combustion Analysis in SI Engines,” JSME International Journal, Series B 46 1 75 85 2003
- Catania, A.E. Misul, D. Mittica, A. Spessa, E. “Unsteady Convection Model for Heat Release Analysis of IC Engine Pressure Data,” SAE 2000 Transactions, Journal of Engines 109 1610 1620 2001
- Catania A. Misul D. Spessa E. Vassallo A. “A Diagnostic Tool for the Analysis of Heat-Release, Flame Propagation Parameters and NO Formation in SI Engines,” JSME Paper No. 471 2004 Submitted for publication in the JSME Transactions
- Heywood, J.B. “Internal Combustion Engine Fundamentals,” McGraw-Hill Int'l Editions 1988
- Spicher, U. Bäcker, H. “Correlation of Flame Propagation and In-Cylinder Pressure in a Spark Ignited Engine,” SAE Paper No. 902126 1990
- Beretta, G.P. Rashidi, M. Keck, J.C. “Turbulent Flame Propagation and Combustion in Spark Ignition Engines,” Combustion and Flame 52 217 245 1983
- Hu, Z. Whitelaw, J.H. Vafidis, C. “Flame Propagation Studies in a Four-Valve Pent roof Chamber Spark Ignition Engine,” SAE Paper No. 922321 1992
- Catania, A.E. d'Ambrosio, S. Mittica, A. Spessa, E. “Experimental Investigation of Fuel Consumption and Exhaust Emissions of a 16V Pent-Roof Engine Fueled by Gasoline and CNG,” SAE 2001 Transactions, Journal of Engines 110 1213 1233 2002
- d'Ambrosio, S. Spessa, E. Vassallo, A. “Methods for Specific Emissions Evaluation in SI Engines Based on Calculation Procedures of Air-Fuel Ratio: Development, Assessment and Critical Comparison,” ASME Transactions, Journal of Engineering for Gas Turbines and Power 127 869 882 2005
- Catania, A.E. Misul, D. Spessa, E. Vassallo, A. “Analysis of Combustion Parameters and Their Relation to Operating Variables and Exhaust Emissions in an Upgraded Multivalve Bi-Fuel CNG SI Engine,” SAE 2004 Transactions, Journal of Engines 113 682 703 2005
- d'Ambrosio, S. Misul, D. Spessa, E. Vassallo, A. “Evaluation of Combustion Velocities in Bi-fuel Engines by Means of an Enhanced Diagnostic Tool Based on a Quasi-Dimensional Multizone Model,” SAE Paper No. 2005-01-0245 2005 To appear in the SAE 2005 Transactions, Journal of Engines