This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Impact of Intake Valve Dynamics on Knock Propensity in a Dual-Fuel SI Engine
Technical Paper
2017-01-2236
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
In this study, the impact of the intake valve timing on knock propensity is investigated on a dual-fuel engine which leverages a low octane fuel and a high octane fuel to adjust the fuel mixture’s research octane rating (RON) based on operating point. Variations in the intake valve timing have a direct impact on residual gas concentrations due to valve overlap, and also affect the compression pressure and temperature by altering the effective compression ratio (eCR). In this study, it is shown that the fuel RON requirement for a non-knocking condition at a fixed operating point can vary significantly solely due to variations of the intake valve timing. At 2000 rpm and 6 bar IMEP, the fuel RON requirement ranges from 80 to 90 as a function of the intake valve timing, and the valve timing can change the RON requirement from 98 to 104 at 2000 rpm and 14 bar IMEP. These significant changes in the required fuel RON are attributed to increases in the charge temperature due to high residual concentration as well as increased cyclic variability in combustion phasing. Due to the wide range of fuel RON requirements with respect to the valve timing, a more sophisticated fueling control strategy is required in order to ensure that knock is properly suppressed despite varying valve timing. The impacts of valve dynamics are investigated in this study to evaluate the effect of response lag in which there is a mismatch between the commanded and actual valve position. The simulation of a WLTC drive cycle is used to illustrate the resulting effect on fuel consumption, which shows a 6% excess consumption of the high octane fuel during valve mismatch periods of the cycle.
Authors
Citation
Kassa, M., Hall, C., Vidal-Naquet, F., and Leroy, T., "The Impact of Intake Valve Dynamics on Knock Propensity in a Dual-Fuel SI Engine," SAE Technical Paper 2017-01-2236, 2017, https://doi.org/10.4271/2017-01-2236.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 |
Also In
References
- Costa , R. C. , and Sodré , J. R. Compression ratio effects on an ethanol/gasoline fuelled engine performance Applied Thermal Engineering 2011 31 2 278 283
- Vichi , G. , Romani , L. , Ferrara , G. , Carmignani , L. et al. Improvement of the Specific Fuel Consumption at Partial Load in SI Engines by Design Strategies based on High Compression Ratio SAE Technical Paper 2014-32-0060 2014 10.4271/2014-32-0060
- Bozza , F. , De Bellis , V. , Gimelli , A. , and Muccillo , M. Strategies for Improving Fuel Consumption at Part-Load in a Downsized Turbocharged SI Engine: a Comparative Study SAE Int. J. Engines 7 1 60 71 2014 10.4271/2014-01-1064
- Su , J. , Xu , M. , Li , T. , Gao , Y. and Wang , J. Combined effects of cooled EGR and a higher geometric compression ratio on thermal efficiency improvement of a downsized boosted spark-ignition direct-injection engine Energy Conversion and Management 2014 78 65 73
- Haskell , W. and Bame , J. Engine Knock -An End-Gas Explosion SAE Technical Paper 650506 1965 10.4271/650506
- Zhen , X. , Wang , Y. , Xu , S. , Zhu , Y et al. The engine knock analysis-An overview Applied Energy 2012 92 628 636
- Guzzella , L. , and Onder , C. Control of Engine Systems: Engine Knock Introduction to Modeling and Control of Internal Combustion Engine Systems Berlin Springer Berlin 2014 199 209
- Ayala , F. , Gerty , M. , and Heywood , J. Effects of Combustion Phasing, Relative Air-fuel Ratio, Compression Ratio, and Load on SI Engine Efficiency SAE Technical Paper 2006-01-0229 2006 10.4271/2006-01-0229
- Cohn , D.R. , Bromberg , L. and Heywood , J.B. 2005 Direct Injection Ethanol Boosted Gasoline Engines: Biofuel Leveraging for Cost Effective Reduction of Oil Dependencies and CO2 Emissions Plasma Science and Fusion Center, Massachusetts Institute of Technology
- Bromberg , L. , Cohn , D.R. and Heywood , J.B. 2006 Calculations of knock suppression in highly turbocharged gasoline/ethanol engines using direct ethanol injection Massachusetts Institute of Technology
- Daniel , R. , Wang , C. , Xu , H. , Tian , G. et al. Dual-Injection as a Knock Mitigation Strategy Using Pure Ethanol and Methanol SAE Int. J. Fuels Lubr. 5 2 772 784 2012 10.4271/2012-01-1152
- Baranski , J. , Anderson , E. , Grinstead , K. , Hoke , J. et al. Control of Fuel Octane for Knock Mitigation on a Dual-Fuel Spark-Ignition Engine SAE Technical Paper 2013-01-0320 2013 10.4271/2013-01-0320
- Cho , S. , Kim , N. , Chung , J. , and Min , K. The Effect of Ethanol Injection Strategy on Knock Suppression of the Gasoline/Ethanol Dual Fuel Combustion in a Spark-Ignited Engine SAE Technical Paper 2015-01-0764 2015 10.4271/2015-01-0764
- Chang , J. , Viollet , Y. , Alzubail , A. , Abdul-Manan , A. et al. Octane-on-Demand as an Enabler for Highly Efficient Spark Ignition Engines and Greenhouse Gas Emissions Improvement SAE Technical Paper 2015-01-1264 2015 10.4271/2015-01-1264
- Viollet , Y. , Abdullah , M. , Alhajhouje , A. , and Chang , J. Characterization of High Efficiency Octane-On-Demand Fuels Requirement in a Modern Spark Ignition Engine with Dual Injection System SAE Technical Paper 2015-01-1265 2015 10.4271/2015-01-1265
- Nagumo , Shinichi , and Hara Seinosuke Study of fuel economy improvement through control of intake valve closing timing: cause of combustion deterioration and improvement JSAE review 16.1 1995 13 19
- Li , L. , Tao , J. , Wang , Y. , Su , Y. et al. Effects of Intake Valve Closing Timing on Gasoline Engine Performance and Emissions SAE Technical Paper 2001-01-3564 2001 10.4271/2001-01-3564
- He , X. , Durrett , R. , and Sun , Z. Late Intake Valve Closing as an Emissions Control Strategy at Tier 2 Bin 5 Engine-Out NOx Level SAE Int. J. Engines 1 1 427 443 2009 10.4271/2008-01-0637
- Xu , K. , Xie , H. , Wan , M. , Chen , T. et al. Effect of Valve Timing and Residual Gas Dilution on Flame Development Characteristics in a Spark Ignition Engine SAE Int. J. Engines 7 1 488 499 2014 10.4271/2014-01-1205
- Luisi , S. , Doria , V. , Stroppiana , A. , Millo , F. et al. Experimental Investigation on Early and Late Intake Valve Closures for Knock Mitigation through Miller Cycle in a Downsized Turbocharged Engine SAE Technical Paper 2015-01-0760 2015 10.4271/2015-01-0760
- Shayler , P. and Alger , L. Experimental Investigations of Intake and Exhaust Valve Timing Effects on Charge Dilution by Residuals, Fuel Consumption and Emissions at Part Load SAE Technical Paper 2007-01-0478 2007 10.4271/2007-01-0478
- Gottschalk , W. , Lezius , U. , and Mathusall , L. Investigations on the Potential of a Variable Miller Cycle for SI Knock Control SAE Technical Paper 2013-01-1122 2013 10.4271/2013-01-1122
- Westin , F. , Grandin , B. , and Ångström , H. The Influence of Residual Gases on Knock in Turbocharged SI-Engines SAE Technical Paper 2000-01-2840 2000 10.4271/2000-01-2840
- Bourhis , G. , Solari , J. , and Dauphin , R. Measurement of RON Requirements for Turbocharged SI Engines: One Step to the Octane on Demand Concept SIA POWERTRAIN- The low CO2 spark ignition engine and its hybridization May 2015 Versailles, France 2015
- Rankovic , N. , Bourhis , G. , Loos , M. , and Dauphin , R. Knock management for dual fuel SI engines: RON evolution when mixing low RON base fuels with octane boosters Fuel Elsevier 2015 150 41 47
- Kasseris , E. and Heywood , J. Charge Cooling Effects on Knock Limits in SI DI Engines Using Gasoline/Ethanol Blends: Part 1-Quantifying Charge Cooling SAE Technical Paper 2012-01-1275 2012 10.4271/2012-01-1275
- Kasseris , E. and Heywood , J. Charge Cooling Effects on Knock Limits in SI DI Engines Using Gasoline/Ethanol Blends: Part 2-Effective Octane Numbers SAE Int. J. Fuels Lubr. 5 2 844 854 2012 10.4271/2012-01-1284