This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Work Extraction Efficiency in a Series Hybrid Opposed Piston Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 21, 2021 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
This work investigates the development of a novel series hybrid architecture utilizing a single cylinder opposed piston engine. The opposed piston engine presents unique benefits in a hybrid architecture such as its lower heat transfer due to a favorable surface area to volume ratio and lack of a cylinder head, as well as the thermodynamic benefits of two stroke operation with uniflow scavenging. A particular focus of this effort is the work extraction efficiency of two design concepts. The first design concept utilizes a geartrain to couple the crankshafts of the engine in a conventional manner, providing a single power take-off for coupling to an electric motor/generator. In this design, the large inertia of the geartrain dampens the speed fluctuation of the single cylinder engine, reducing the peak torque required to for the electric machine. However, the friction losses caused by the geartrain limit the maximum work extraction efficiency. The second design concept eliminates the geartrain by coupling an electric machine directly to each crankshaft of the opposed piston engine. While elimination of the geartrain avoids the frictional losses of the first design, the large torque and velocity oscillations characteristic of a single cylinder engine are no longer damped. Furthermore, feedback control algorithms are required to maintain the relative phasing between the two crankshafts and thus requires larger torque capability from the electric machines. A parametric study of motor and engine characteristics was conducted to project the efficiency entitlement of each hybrid architecture based on models of the electric motor/generator which have been validated by experimental results. Elimination of the geartrain increases the ceiling for the system efficiency. However, in practice the larger amplitude torque pulsations from the electric motor required to track the desired exhaust crankshaft lead may offset the benefits in friction reduction.
CitationDrallmeier, J., Hofmann, H., Middleton, R., Siegel, J. et al., "Work Extraction Efficiency in a Series Hybrid Opposed Piston Engine," SAE Technical Paper 2021-01-1242, 2021, https://doi.org/10.4271/2021-01-1242.
Data Sets - Support Documents
|Unnamed Dataset 1|
|Unnamed Dataset 2|
|Unnamed Dataset 3|
|Unnamed Dataset 4|
|Unnamed Dataset 5|
|Unnamed Dataset 6|
- U.S. Department of Transportation BoTS Transportation Statistics Annual Report 2020 Washington, DC 2020 10.21949/1520449
- Enang , W. and Bannister , C. Modelling and Control of Hybrid Electric Vehicles (A Comprehensive Review) Renewable and Sustainable Energy Reviews 74 2017 1210 1239 10.1016/j.rser.2017.01.075
- 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 https://doi.org/10.4271/2011-01-2216
- 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 https://doi.org/10.4271/2013-26-0114
- Salvi , A. , Hanson , R. , Zermeno , R. , Regner , G. et al. Initial Results on a New Light-Duty 2.7L Opposed-Piston Gasoline Compression Ignition Multi-Cylinder Engine Presented at ASME Internal Combustion Engine Fall Technical Conference (ICEF) 2018 10.1115/ICEF2018-9610
- Silvas , E. , Hofman , T. , Murgovski , N. , Etman , L.F.P. et al. Review of Optimization Strategies for System-Level Design in Hybrid Electric Vehicles IEEE Transactions on Vehicular Technology 66 1 2017 57 70 10.1109/TVT.2016.2547897
- Drallmeier , J. , Siegel , J.B. , Middleton , R. , Stefanopoulou , A.G. et al. Modeling and Control of a Hybrid Opposed Piston Engine Manuscript Submitted for Publication 2021
- Song , H. , and Hofmann , H. Robust, Accurate Systems-based Power Electronic Circuit Models in Simulink Presented at 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018 2018 10.1109/COMPEL.2018.8460049
- Yusivar , F. , Hidayat , N. , Gunawan , R. , and Halim , A. Implementation of Field Oriented Control for Permanent Magnet Synchronous Motor Presented at Proceedings of 2014 International Conference on Electrical Engineering and Computer Science, ICEECS 2014 2014 395 362 10.1109/ICEECS.2014.7045278