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The Development and Evaluation of Robust Combustion Systems for Miller Cycle Engines
Technical Paper
2018-01-1416
ISSN: 0148-7191, e-ISSN: 2688-3627
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Abstract
Miller Cycle engines employ a high expansion ratio to achieve high part-load efficiency, while minimizing knock sensitivity by using valve events that limit the effective compression ratio. The Miller effect may be achieved using either early or late intake valve closure. Combustion systems for these engines must be carefully designed to obtain adequate trapped charge to achieve full-load objectives as well as charge motion characteristics supporting good mixture preparation and flame propagation. This paper summarizes the results of a holistic project tasked with developing robust combustion systems for both early and late intake valve closure strategies. Based on best practices from conventional engines and preliminary Miller cycle requirements, a series of combustion systems was designed. These were analyzed using 3-dimensional computational fluid dynamics and those showing favorable combustion characteristics were experimentally evaluated using a modular single cylinder engine. Through a rapid assessment process, evaluations of part-load, full-load, light-load, and emissions performance were completed. The results of these experiments supported refined designs. These refined combustion systems were, again, evaluated analytically before being assessed experimentally. It was found that both early and late intake valve timing could be used to achieve high efficiency at part load while achieving full-load performance objectives. At peak power, the early intake closure systems better limited the effective compression ratio and were, consequently, more robust against knock. Both systems demonstrated similar part-load efficiency potential. Both strategies were sensitive to boost system capability. Based on the experimental results, with context added by further analytical studies, important design considerations and other implications of early and late intake valve closure Miller Cycle combustion systems are outlined.
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Ketterer, J., Gautier, E., and Keating, E., "The Development and Evaluation of Robust Combustion Systems for Miller Cycle Engines," SAE Technical Paper 2018-01-1416, 2018, https://doi.org/10.4271/2018-01-1416.Data Sets - Support Documents
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References
- Pendlebury , K. , Stokes , J. , Dalby , J. , and Osborne , R. 2014
- Wurms , R. , Budack , R. , Grigo , M. 2015
- Akima , K. , Seko , K. , Taga , W. , Torii , K. et al. Development of New Low Fuel Consumption 1.8L i-VTEC Gasoline Engine with Delayed Intake Valve Closing SAE Technical Paper 2006-01-0192 2006 https://doi.org/10.4271/2006-01-0192
- Zaccardi , J. , Pagot , A. , Vangraefschepe , F. , Dognin , C. et al. Optimal Design for a Highly Downsized Gasoline Engine SAE Technical Paper 2009-01-1794 2009 https://doi.org/10.4271/2009-01-1794
- Taylor , J. , Fraser , N. , Dingelstadt , R. , and Hoffmann , H. Benefits of Late Inlet Valve Timing Strategies Afforded Through the Use of Intake Cam In Cam Applied to a Gasoline Turbocharged Downsized Engine SAE Technical Paper 2011-01-0360 2011 https://doi.org/10.4271/2011-01-0360
- Martins , J. , Uzuneanu , K. , Ribeiro , B. , and Jasasky , O. Thermodynamic Analysis of an Over-Expanded Engine SAE Technical Paper 2004-01-0617 2004 https://doi.org/10.4271/2004-01-0617
- Anderson , M. , Assanis , D. , and Filipi , Z. First and Second Law Analyses of a Naturally-Aspirated, Miller Cycle, SI Engine with Late Intake Valve Closure SAE Technical Paper 980889 1998 https://doi.org/10.4271/980889
- Lanzanova , T. , Nora , M. , and Zhao , H. Investigation of Early and Late Intake Valve Closure Strategies for Load Control in a Spark Ignition Ethanol Engine SAE Int. J. Engines 10 3 858 872 2017 https://doi.org/10.4271/2017-01-0643
- Hitomi , M. , Sasaki , J. , Hatamura , K. , and Yano , Y. Mechanism of Improving Fuel Efficiency by Miller Cycle and Its Future Prospect SAE Technical Paper 950974 1995 https://doi.org/10.4271/950974
- Heywood , J.B. Internal Combustion Engine Fundamentals New York McGraw-Hill 1988
- Cordier , M. , Laget , O. , Duffour , F. , Gautrot , X. et al. Increasing Modern Spark Ignition Engine Efficiency: A Comprehension Study of High CR and Atkinson Cycle SAE Technical Paper 2016-01-2172 2016 https://doi.org/10.4271/2016-01-2172
- Stricker , K. , Kocher , L. , Koeberlein , E. , Van Alstine , D. et al. Effective Compression Ratio Estimation in Engines with Flexible Intake Valve Actuation Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 226 8 1001 1015 2012 https://doi.org/10.1177/0954407012438024
- Osborne , R. , Downes , T. , O'Brien , S. , Pendlebury , K. et al. A Miller Cycle Engine without Compromise - The Magma Concept SAE Int. J. Engines 10 3 846 857 2017 https://doi.org/10.4271/2017-01-0642
- Jääskeläinen , H. Miller Cycle Engines DieselNet https://www.dieselnet.com/tech/engine_miller-cycle.php#intro
- Zheng , B. , Yin , T. , and Li , T. Analysis of Thermal Efficiency Improvement of a Highly Boosted, High Compression Ratio, Direct-Injection Gasoline Engine with LIVC and EIVC at Partial and Full Loads SAE Technical Paper 2015-01-1882 2015 https://doi.org/10.4271/2015-01-1882
- Wan , Y. and Du , A. Reducing Part Load Pumping Loss and Improving Thermal Efficiency through High Compression Ratio Over-Expanded Cycle SAE Technical Paper 2013-01-1744 2013 https://doi.org/10.4271/2013-01-1744
- Miklanek , L. , Vitek , O. , Gotfryd , O. , and Klir , V. Study of Unconventional Cycles (Atkinson and Miller) with Mixture Heating as a Means for the Fuel Economy Improvement of a Throttled SI Engine at Part Load SAE Int. J. Engines 5 4 1624 1636 2012 https://doi.org/10.4271/2012-01-1678
- Ouyang , X. , Teng , H. , Zeng , X. , Luo , X. et al. A Comparative Study on Influence of EIVC and LIVC on Fuel Economy of A TGDI Engine Part I: Friction Torques of Intake Cams with Different Profiles and Lifts SAE Technical Paper 2017-01-2245 2017 http://doi.org/10.4271/2017-01-2245
- Luo , X. , Teng , H. , Lin , Y. , Li , B. et al. A Comparative Study on Influence of EIVC and LIVC on Fuel Economy of a TGDI Engine Part II: Influences of Intake Event and Intake Valve Closing Timing on the Cylinder Charge Motion SAE Technical Paper 2017-01-2246 2017 https://doi.org/10.4271/2017-01-2246
- Sens , M. , Guenther , M. , Hunger , M. , Mueller , J. et al. Achieving the Max - Potential from a Variable Compression Ratio and Early Intake Valve Closure Strategy by Combination with a Long Stroke Engine Layout SAE Technical Paper 2017-24-0155 2017 https://doi.org/10.4271/2017-24-0155
- Morand , N. , Agnew , G. , Bontemps , N. , and Jeckel , D. Variable Nozzle Turbine Turbocharger for Gasoline “Miller” Engine MTZ Worldwide 78 1 40 45 2017 http://dx.doi.org/10.1007/s38313-016-0148-5
- Li , Y. , Zhao , H. , Stansfield , P. , and Freeland , P. Synergy between Boost and Valve Timings in a Highly Boosted Direct Injection Gasoline Engine Operating with Miller Cycle SAE Technical Paper 2015-01-1262 2015 https://doi.org/10.4271/2015-01-1262
- Lake , T. , Stokes , J. , Murphy , R. , Osborne , R. et al. Turbocharging Concepts for Downsized DI Gasoline Engines SAE Technical Paper 2004-01-0036 2004 https://doi.org/10.4271/2004-01-0036
- Halsall , S. , Luchansky , K. , Zeng , Y. , Davis , R. et al. Development of the Combustion System for the General Motors Fifth Generation “Small Block” Engine Family SAE Technical Paper 2013-01-1732 2013 https://doi.org/10.4271/2013-01-1732
- Patterson , G. and Davis , R. Geometric and Topological Considerations to Maximize Remotely Mounted Cylinder Pressure Transducer Data Quality SAE Int. J. Engines 2 1 414 420 2009 https://doi.org/10.4271/2009-01-0644
- Davis , R. and Patterson , G. Cylinder Pressure Data Quality Checks and Procedures to Maximize Data Accuracy SAE Technical Paper 2006-01-1346 2006 https://doi.org/10.4271/2006-01-1346
- Chapman , E. and Costanzo , V. A Literature Review of Abnormal Ignition by Fuel and Lubricant Derivatives SAE Int. J. Engines 9 1 107 142 2016 https://doi.org/10.4271/2015-01-1869
- Berntsson , A. , Josefsson , G. , Ekdahl , R. , Ogink , R. et al. The Effect of Tumble Flow on Efficiency for a Direct Injected Turbocharged Downsized Gasoline Engine SAE Int. J. Engines 4 2 2298 2311 2011 https://doi.org/10.4271/2011-24-0054
- 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 https://doi.org/10.4271/2006-01-0229
- Whitaker , P. , Kapus , P. , Ogris , M. , and Hollerer , P. Measures to Reduce Particulate Emissions from Gasoline DI engines SAE Int. J. Engines 4 1 1498 1512 2011 https://doi.org/10.4271/2011-01-1219