This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Achieving Ultra-Low Oil Consumption in Opposed Piston Two-Stroke Engines
Technical Paper
2019-01-0068
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
The opposed piston two-stroke (OP2S) engine architecture is widely recognized for its improved fuel efficiency relative to a four-stroke engine. Achates Power Inc. seeks to demonstrate the market readiness of the OP2S engine by proving competitive in other important areas, one of which is oil consumption. Achieving oil consumption competitive to modern four-stroke engines is thus a key step in bringing OP2S technology to market. Two-stroke engines have historically suffered from higher engine lube oil consumption and subsequent emissions and durability challenges. This is primarily due to two main features of traditional two-stroke engines; the direct interaction of the piston skirt and rings with the intake and/or exhaust ports, which results in a direct leak path for lube oil to the combustion chamber and/or exhaust manifold, and crankcase-scavenged architectures which entrain oil into air being pumped through the crankcase. The OP2S engine architecture directly addresses these concerns by utilizing intake and exhaust manifolds, a closed crankcase system, and oil control rings which operate outboard of the ports. Previous work has shown the importance of careful consideration of cylinder liner, piston, and ring design in minimizing oil consumption of the OP2S architecture. This work evaluates further refinements in cylinder form, hone texture and oil retention, port sealing ring design, and oil control ring design. A Da Vinci DALOC sulfur-trace analyzer for real-time oil consumption measurement was used to generate speed vs. load maps of oil consumption of an Achates Power OP2S A48 development engine, operated under typical medium-duty conditions. The engine demonstrated oil consumption levels competitive with modern four-stroke benchmarks and completed a 100-hour durability test with no measured performance loss or increase in oil consumption. This work represents a key step towards proving the potential of the Achates Power OP2S engine architecture in the commercial and passenger vehicle markets.
Recommended Content
Authors
Topic
Citation
Chown, D., Koszewnik, J., MacKenzie, R., Pfeifer, D. et al., "Achieving Ultra-Low Oil Consumption in Opposed Piston Two-Stroke Engines," SAE Technical Paper 2019-01-0068, 2019, https://doi.org/10.4271/2019-01-0068.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 | ||
Unnamed Dataset 2 | ||
Unnamed Dataset 3 | ||
Unnamed Dataset 4 | ||
Unnamed Dataset 5 | ||
Unnamed Dataset 6 |
Also In
References
- U.S. Energy Information Administration 2018
- Warey , A. , Gopalakrishnan , V. , Potter , M. , Mattarelli , E. et al. An Analytical Assessment of the CO2 Emissions Benefit of Two-Stroke Diesel Engines SAE Technical Paper 2016-01-0659 2016 10.4271/2016-01-0659
- Herold , R.E. , Wahl , M.H. , Regner , G. , and Lemke , J.U. Thermodynamic Benefits of Opposed Piston Two-Stroke Engines SAE Technical Paper 2011-01-2216 2011 10.4271/2011-01-2216
- Abani , N. , Nagar , N. , Zermeno , R. , Chiang , M. et al. Developing a 55% BTE Commercial Heavy-Duty Opposed-Piston Engine without a Waste Heat Recovery System SAE Technical Paper 2017-01-0638 2017 10.4271/2017-01-0638
- Naik , S. , Johnson , D. , Fromm , L. , Koszewnik , J. et al. Achieving Bharat Stage VI Emissions Regulations While Improving Fuel Economy with the Opposed-Piston Engine SAE Int. J. Engines 10 1 17 26 2017 10.4271/2017-26-0056
- Hanson , R. , Strauss , S. , Redon , F. , and Salvi , A. Progress in Light-Duty OPGCI Engine Design and Testing SIA Powertrain Conference 2017
- Patil , S. , Ghazi , A. , Redon , F. , Sharp , C. et al. Cold Start HD FTP Test Results on Multi-Cylinder Opposed-Piston Engine Demonstrating Rapid Exhaust Enthalpy Rise to Achieve Ultra Low NOx SAE Technical Paper 2018-01-1378 2018 10.4271/2018-01-1378
- Callahan , B.J. , Wahl , M.H. , and Froelund , K. Oil Consumption Measurements for a Modern Opposed-Piston Two-Stroke Diesel Engine Proceedings of the ASME 2011 Internal Combustion Engine Division Fall Conference Morgantown, WV 2011
- Cameron , K. Two-Stroke Engines: Defining Their Purpose Cycle World n.d. https://www.cycleworld.com/2015/04/06/two-stroke-motorcycle-engines-explained-tech-talk-by-kevin-cameron
- Gehring Technologies Laser Honing n.d. https://www.gehring.de/en-ww/laser-honing
- Froelund , K. and Ross , M.G. Laboratory Benchmarking of Seven Model Year 2003-2004 Heavy-Duty Diesel Engines Using a CI-4 Lubricant SAE Technical Paper 2005-01-3715 2005 10.4271/2005-01-3715
- Froelund , K. , Menezes , L.A. , Johnson , H.R. , and Rein , W.O. Real-Time Transient and Steady-State Measurement of Oil Consumption for Several Production SI-Engines SAE Technical Paper 2001-01-1902 2001 10.4271/2001-01-1902