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Spark Assist for CA50 Control and Improved Robustness in a Premixed LTGC Engine – Effects of Equivalence Ratio and Intake Boost
Technical Paper
2018-01-1252
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Low-temperature gasoline combustion (LTGC) engines can deliver high efficiencies, with ultra-low emissions of nitrogen oxides (NOx) and particulate matter (PM). However, controlling the combustion timing and maintaining robust operation remains a challenge for LTGC engines. One promising technique to overcoming these challenges is spark assist (SA). In this work, well-controlled, fully premixed experiments are performed in a single-cylinder LTGC research engine at 1200 rpm using a cylinder head modified to accommodate a spark plug. Compression ratios (CR) of 16:1 and 14:1 were used during the experiments. Two different fuels were also tested, with properties representative of premium- and regular-grade market gasolines. SA was found to work well for both CRs and fuels. The equivalence ratio (ϕ) limits and the effect of intake-pressure boost on the ability of SA to compensate for a reduced Tin were studied. For the conditions studied, ϕ=0.42 was found to be most effective for SA. At lower equivalence ratios the flame propagation was too weak, whereas ϕ=0.45 was closer to the CI knock/stability limit, which resulted in a smaller range of CA50 control and Tin compensation. At ϕ=0.42, SA worked well from Pin = 1.0 to 1.6 bar, but the range of effective Tin compensation dropped progressively with boost from 21 °C at Pin = 1.0 bar to the equivalent of 12 °C at Pin = 1.6 bar. The amount of control authority using SA was demonstrated by varying the spark timing, advancing CA50 to the onset of strong knocking and then retarding CA50 to near misfire. SA provided good control, however the CA50 control range decreased from 7.2° CA at Pin = 1.0 bar to 4.2° CA at Pin = 1.6 bar. For all intake pressures at these well-mixed conditions, NOx emissions for SA were less than for compression ignition only, and all were below the US-2010 Heavy Duty limit.
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Authors
Citation
Gentz, G., Dernotte, J., Ji, C., and Dec, J., "Spark Assist for CA50 Control and Improved Robustness in a Premixed LTGC Engine – Effects of Equivalence Ratio and Intake Boost," SAE Technical Paper 2018-01-1252, 2018, https://doi.org/10.4271/2018-01-1252.Data Sets - Support Documents
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References
- Dec , J.E. Advanced Compression-Ignition Combustion for High Efficiency and Ultra-Low NOX and Soot Encyclopedia of Automotive Engineering John Wiley & Sons, Ltd 2014
- Hanho , Y. , Wermuth , N. , and Najt , P. High Load HCCI Operation Using Different Valving Strategies in a Naturally-Aspirated Gasoline HCCI Engine SAE International Journal of Engines 4 1 1190 1201 2011 10.4271/2011-01-0899
- Persson , H. , Hultqvist , A. , Johansson , B. , and Remón , A. 2007
- Persson , H. , Pfeiffer , R. , Hultqvist , A. , Johansson , B. , and Ström , H. 2005
- Zigler , B.T. , Keros , P.E. , Helleberg , K.B. , Fatouraie , M. et al. An Experimental Investigation of the Sensitivity of the Ignition and Combustion Properties of a Single-Cylinder Research Engine to Spark-Assisted HCCI International Journal of Engine Research 12 4 353 375 2011 10.1177/1468087411401286
- Manofsky , L. , Vavra , J. , Assanis , D.N. , and Babajimopoulos , A. 2011
- Foong , T.M. , Morganti , K.J. , Brear , M.J. , da Silva , G. et al. The Octane Numbers of Ethanol Blended with Gasoline and Its Surrogates Fuel 115 Supplement C 727 739 2014 10.1016/j.fuel.2013.07.105
- Olesky , L.K.M. , Middleton , R.J. , Lavoie , G.A. , Wooldridge , M.S. , and Martz , J.B. On the Sensitivity of Low Temperature Combustion to Spark Assist near Flame Limit Conditions Fuel 158 Supplement C 11 22 2015 10.1016/j.fuel.2015.05.012
- Olesky , L.M. , Lavoie , G.A. , Assanis , D.N. , Wooldridge , M.S. , and Martz , J.B. The Effects of Diluent Composition on the Rates of HCCI and Spark Assisted Compression Ignition Combustion Applied Energy 124 Supplement C 186 198 2014 10.1016/j.apenergy.2014.03.015
- Olesky , L.M. , Martz , J.B. , Lavoie , G.A. , Vavra , J. et al. The Effects of Spark Timing, Unburned Gas Temperature, and Negative Valve Overlap on the Rates of Stoichiometric Spark Assisted Compression Ignition Combustion Applied Energy 105 Supplement C 407 417 2013 10.1016/j.apenergy.2013.01.038
- Dec , J.E. , Yi , Y. , and Dronniou , N. Improving Efficiency and Using E10 for Higher Loads in Boosted HCCI Engines SAE International Journal of Engines 5 3 1009 1032 2012 10.4271/2012-01-1107
- Dronniou , N. and Dec , J.E. Investigating the Development of Thermal Stratification from the Near-Wall Regions to the Bulk-Gas in an HCCI Engine with Planar Imaging Thermometry SAE International Journal of Engines 5 3 1046 1074 2012 10.4271/2012-01-1111
- Zhao , Fu-Quan , Ming-Chia Lai , and David L. Harrington 1995 The Spray Characteristics of Automotive Port Fuel Injection-a Critical Reviews
- Styron , J. P. , P. L. Kelly-Zion , C. F. Lee , J. E. Peters , R. A. White , and R. P. Lucht 2000 Multicomponent Liquid and Vapor Fuel Distribution Measurements in the Cylinder of a Port-Injected, Spark-Ignition Engine
- Dec , J.E. and Yi , Y. Boosted HCCI for High Power without Engine Knock and with Ultra-Low NOx Emissions - Using Conventional Gasoline SAE International Journal of Engines 3 1 750 767 2010 10.4271/2010-01-1086
- Yang , Y. , Dec , J.E. , Dronniou , N. , and Cannella , W. Boosted HCCI Combustion Using Low-Octane Gasoline with Fully Premixed and Partially Stratified Charges SAE International Journal of Engines 5 3 1075 1088 2012 10.4271/2012-01-1120
- Dec , J.E. , Dernotte , J. , and Ji , C. Increasing the Load Range, Load-To-Boost Ratio, and Efficiency of Low-Temperature Gasoline Combustion (LTGC) Engines SAE International Journal of Engines no. 10 3 1256 1274 2017 10.4271/2017-01-0731
- Dernotte , Jeremie , John Dec , and Chunsheng Ji 2017 Efficiency Improvement of Boosted Low-Temperature Gasoline Combustion Engines (LTGC) Using a Double Direct-Injection Strategy
- Dec , J.E. , Yang , Y. , Dernotte , J. , and Ji , C. Effects of Gasoline Reactivity and Ethanol Content on Boosted, Premixed and Partially Stratified Low-Temperature Gasoline Combustion (LTGC) SAE International Journal of Engines 8 3 935 955 2015 10.4271/2015-01-0813
- Dernotte , J. , Dec , J.E. , and Ji , C. Energy Distribution Analysis in Boosted HCCI-Like / LTGC Engines - Understanding the Trade-Offs to Maximize the Thermal Efficiency SAE International Journal of Engines 8 3 956 980 2015 10.4271/2015-01-0824
- Dec , John E. , and Magnus Sjöberg 2003 A Parametric Study of HCCI Combustion - the Sources of Emissions at Low Loads and the Effects of GDI Fuel Injection
- Heywood , J.B. Internal Combustion Engine Fundamentals New York McGraw-Hill 1988 1988
- Eng , J. A. 2002 Characterization of Pressure Waves in HCCI Combustion
- Sjöberg , Magnus , John E. Dec , Aristotelis Babajimopoulos , and Dennis N. Assanis 2004 Comparing Enhanced Natural Thermal Stratification against Retarded Combustion Phasing for Smoothing of HCCI Heat-Release Rates
- Middleton , R.J. , Martz , J.B. , Lavoie , G.A. , Babajimopoulos , A. , and Assanis , D.N. A Computational Study and Correlation of Premixed Isooctane Air Laminar Reaction Fronts Diluted with EGR Combustion and Flame 159 10 3146 3157 2012 10.1016/j.combustflame.2012.04.014
- Ayala , Ferrán A. , and John B. Heywood 2007 Consiglio Nazionale delle Ricerche 10.4271/2007-24-0030
- Ayala , Ferrán A. , Michael D. Gerty , and John B. Heywood 2006 Effects of Combustion Phasing, Relative Air-Fuel Ratio, Compression Ratio, and Load on SI Engine Efficiency
- Tabaczynski , R.J. , Trinker , F.H. , and Shannon , B.A.S. Further Refinement and Validation of A Turbulent Flame Propagation Model for Spark-Ignition Engines Combustion and Flame 39 2 111 121 1980 10.1016/0010-2180(80)90011-5