This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Potentials of the Miller Cycle on HD Diesel Engines Regarding Performance Increase and Reduction of Emissions
Technical Paper
2015-24-2440
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
A variable air path on diesel engines offers further potentials to manage the challenges of engine development - such as reduction of emissions and fuel consumption, as well as performance increase. The Miller cycle is one of the possibilities, which is well known as an effective way to reduce process temperatures and so NOX emissions. The present paper discusses the potentials of this strategy for heavy duty diesel engines by identifying and analyzing the effects caused.
The investigations were carried out in the upper load range. First the isolated effect of the Miller cycle was analyzed. The results show reduced NOX emissions, although increased PM and CO emissions were measured. Further, the Miller cycle caused a reduction in peak cylinder pressure. This pressure reserve can be used to combine the Miller cycle with further measures while maintaining the maximum cylinder pressure of the reference operation point. On the one hand, a performance increase of about 10% was achieved. On the other hand, the combination of Miller cycle and increased boost pressure showed great potential to optimize the NOX-PM trade-off and led to an efficiency rise. To understand the effects caused, the losses of the process were separated and compared with the reference operation point.
The experimental tests were carried out on a single cylinder heavy duty test engine equipped with an in-house developed camless valve actuation system, and operated in a flexible test environment.
Recommended Content
Authors
Topic
Citation
Kovács, D. and Eilts, P., "Potentials of the Miller Cycle on HD Diesel Engines Regarding Performance Increase and Reduction of Emissions," SAE Technical Paper 2015-24-2440, 2015, https://doi.org/10.4271/2015-24-2440.Also In
References
- Miller , R. H. Supercharging and Internal Cooling Cycle for High Output ASME Transactions 69 453 457 1947
- Miller , R.H. , Lieberherr , H. U. The Miller supercharging system for diesel and gas engines operating characteristics International Congress of Combustion Engine Conference, CIMAC 787 803 1957
- Codan , E. and Vlaskos , I. Turbocharging medium speed diesel engines with extreme Miller timing 9 th Turbocharging Conference Dresden 2004
- Schutting , E. , Neureiter , A. , Fuchs , C. , Schatzberger , T et al. Miller- and Atkinson-Cycle on a Turbocharged Diesel Engine MTZ worldwide 68 6 21 23 2007 10.1007/BF03226837
- Ehleskog , M. , Gjirja , S. , and Denbratt , I. Effects of Variable Inlet Valve Timing and Swirl Ratio on Combustion and Emissions in a Heavy Duty Diesel Engine SAE Technical Paper 2012-01-1719 2012 10.4271/2012-01-1719
- Brückner , C. , Kyrtatos , P. , and Boulouchos , K. Extending the NOx Reduction Potential with Miller Valve Timing Using Pilot Fuel Injection on a Heavy-Duty Diesel Engine SAE Int. J. Engines 7 4 1838 1850 2014 10.4271/2014-01-2632
- Kyratos , P. , Hoyek , K. , Obrecht , P. and Boulouchos , K. Recent developments in the Understanding of the Potential of In-Cylinder NO X Reduction through Extreme Miller Valve Timing International Congress of Combustion Engine Conference, CIMAC 2013, Paper No.: 225 Shanghai 2013
- Millo , F. , Mallamo , F. , and Mego , G. The Potential of Dual Stage Turbocharging and Miller Cycle for HD Diesel Engines SAE Technical Paper 2005-01-0221 2005 10.4271/2005-01-0221
- Benajes , J. , Molina , S. , Martín , J. and Novella , R Effect of advancing the closing angle of intake valves on diffusion-controlled combustion in a HD diesel engine Applied Thermal Engineering 29 1947 1954 2009 10.1016/j.applthermaleng.2008.09.014
- Kodama , Y. , Nishizawa , I. , Sugihara , T. , Sato , N. et al. Full-Load HCCI Operation with Variable Valve Actuation System in a Heavy-Duty Diesel Engine SAE Technical Paper 2007-01-0215 2007 10.4271/2007-01-0215
- Benajes , J. , Molina , S. , Novella , R. and Riesco , M. Improving Pollutant Emissions in Diesel Engines for Heavy-Duty Transportation Using Retarded Intake Valve Closing Strategies International Journal of Automotive Technology 9 3 257 265 2008 10.1007/s12239-008-0032-7
- Benajes , J. , Serrano , J. R. , Molina , S. and Novella R. Potential of Atkinson cycle combined with EGR for pollutant control in a HD diesel engine Energy Conversion and Management 50 174 183 2009 10.1016/j.enconman.2008.08.034
- Murata , Y. , Kusaka , J. , Daisho , Y. , Kawano , D. et al. Miller-PCCI Combustion in an HSDI Diesel Engine with VVT SAE Int. J. Engines 1 1 444 456 2009 10.4271/2008-01-0644
- De Ojeda , W. Effect of Variable Valve Timing on Diesel Combustion Characteristics SAE Technical Paper 2010-01-1124 2010 10.4271/2010-01-1124
- Weberbauer , F. , Rauscher , M. , Kulzer , A. , Knopf , M. et al. Generally Applicate Split of Losses For New Combustion Concepts MTZ worldwide 66 2 17 19 2005 10.1007/BF03227736
- Gehrke , S. , Weiskirch , C. , and Eilts , P. Development and Implementation of a Variable Valve Actuation System to a HD Diesel Engine SAE Technical Paper 2008-01-1359 2008 10.4271/2008-01-1359
- Gehrke , S. , Kovács , D. , Eilts , P. , Rempel , A. et al. Investigation of VVA-Based Exhaust Management Strategies by Means of a HD Single Cylinder Research Engine and Rapid Prototyping Systems SAE Int. J. Commer. Veh. 6 1 47 61 2013 10.4271/2013-01-0587
- Wolf , R. and Eilts , P. Comparison of Fuel Consumption and Emissions of Automotive and Large-Bore Diesel Engines SAE Int. J. Engines 7 1 221 233 2014 10.4271/2014-01-1100