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Meeting Stringent 2025 Emissions and Fuel Efficiency Regulations with an Opposed-Piston, Light-Duty Diesel Engine
Technical Paper
2014-01-1187
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
With current and pending regulations-including Corporate Average Fuel Economy (CAFE) 2025 and Tier 3 or LEV III-automakers are under tremendous pressure to reduce fuel consumption while meeting more stringent NOx, PM, HC and CO standards. To meet these standards, many are investing in expensive technologies-to enhance conventional, four-stroke powertrains-and in significant vehicle improvements. However, others are evaluating alternative concepts like the opposed-piston, two-stroke engine.
First manufactured in the 1890s-and once widely used for ground, marine and aviation applications-the historic opposed-piston, two-stroke (OP2S) engine suffered from poor emissions and oil control. This meant that its use in on-highway applications ceased with the passage of modern emissions standards.
Since then, Achates Power has enhanced the opposed-piston engine and resolved its historic challenges: wrist pin and power cylinder durability, piston and cylinder thermal management, piston ring integrity and oil consumption [1].
An in-depth study on opposed-piston, two-stroke diesel engine performance and emissions in a light-duty truck application is presented here for the first time in a technical paper. The paper includes a:
- Brief review of the opposed-piston, two-stroke engine's architectural advantages (thermodynamics, pumping work and combustion)
- Comprehensive overview of the engine's performance and emissions results, including indicated thermal efficiency, fuel consumption and emissions
- Comparison of fuel economy and emissions to the published benchmark, the Cummins 2.8L ATLAS Diesel Engine [2]
- Discussion of an exhaust temperature control strategy that is used to meet the aggressive catalyst light-off requirements of light-duty applications by achieving rapid catalyst light-off after a cold start
- Comparison of engine balance of the light-duty truck concept engine and a state-of-the-art gasoline V6 engine
- Examination of the packaging options for an opposed-piston, two-stroke engine in a light-duty truck application
The results of this study show that the Achates Power opposed-piston engine benefits-high efficiency, low emissions and reduced cost, mass and complexity-already demonstrated for medium-duty commercial vehicles [1] are also available for light-duty applications. In fact, to an even greater extent: over 30% fuel economy improvement when compared to an equivalent four-stroke diesel engine.
Moreover, this study shows that the final 2025 light-truck CAFE fuel economy regulation not only has the potential to be met but also the potential to be exceeded with a full-size 5,500 lb. pick-up truck by simply applying the Achates Power technology without any hybridization or vehicle improvements.
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Citation
Redon, F., Kalebjian, C., Kessler, J., Rakovec, N. et al., "Meeting Stringent 2025 Emissions and Fuel Efficiency Regulations with an Opposed-Piston, Light-Duty Diesel Engine," SAE Technical Paper 2014-01-1187, 2014, https://doi.org/10.4271/2014-01-1187.Also In
References
- Regner , G. , Johnson , D. , Koszewnik , J. , Dion , E. et al. Modernizing the Opposed Piston, Two Stroke Engine for Clean, Efficient Transportation SAE Technical Paper 2013-26-0114 2013 10.4271/2013-26-0114
- Suresh , A. , Langenderfer , D. , Arnett , C. , and Ruth , M. Thermodynamic Systems for Tier 2 Bin 2 Diesel Engines SAE Int. J. Engines 6 1 167 183 2013 10.4271/2013-01-0282
- Kalebjian , C. , Redon , F. , and Wahl , M. Low Emissions and Rapid Catalyst Light-Off Capability for Upcoming Emissions Regulations with an Opposed-Piston, Two-Stroke Diesel Engine Emissions 2012 Conference
- Flint , M. and Pirault , J.P. Opposed Piston Engines: Evolution, Use, and Future Applications SAE International Warrendale, PA 978-0-7680-1800-4 2009 10.4271/R-378
- Herold , R. , Wahl , M. , Regner , G. , Lemke , J. et al. Thermodynamic Benefits of Opposed-Piston Two-Stroke Engines SAE Technical Paper 2011-01-2216 2011 10.4271/2011-01-2216
- Regner , G. , Naik , S. Not All Two-Stroke Engines Are Created Equal http://www.achatespower.com/diesel-engineblog/2013/09/27/not-all-two-stroke-engines-are-createdequal/ 2013
- Regner , G. Turbocharger Efficiency: An Underappreciated OP2S Advantage http://www.achatespower.com/diesel-engineblog/2013/01/23/turbocharger-efficiency/ 2013
- Regner , G. The Achates Power Engine: Low NOx and Superior Efficiency http://www.achatespower.com/diesel-engineblog/2013/02/27/low-nox/ 2013
- Fuqua , K. , Redon , F. , Shen , H. , Wahl , M. , and Lenski , B. Combustion Chamber Constructions for Opposed-Piston Engines U.S. Patent Application US20110271932
- Venugopal , R. , Abani , N. , and MacKenzie , R. Effects of Injection Pattern Design on Piston Thermal Management in an Opposed-Piston Two-Stroke Engine SAE Technical Paper 2013-01-2423 2013 10.4271/2013-01-2423
- Pohorelsky , L. , Brynych , P. , Macek , J. , Vallaude , P. et al. Air System Conception for a Downsized Two-Stroke Diesel Engine SAE Technical Paper 2012-01-0831 2012 10.4271/2012-01-0831
- Ostrowski , G. , Neely , G. , Chadwell , C. , Mehta , D. et al. Downspeeding and Supercharging a Diesel Passenger Car for Increased Fuel Economy SAE Technical Paper 2012-01-0704 2012 10.4271/2012-01-0704
- Teng , H. and Regner , G. Characteristics of Soot Deposits in EGR Coolers SAE Int. J. Fuels Lubr. 2 2 81 90 2009 10.4271/2009-01-2671
- Callahan , B. , Froelund , K. , Wahl , M. Oil Consumption Measurements for a Modern Opposed-Piston Two-Stroke Diesel Engine ASME Technical Paper, ICEF2011-60140 2011