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Title: Investigations for a trajectory variation to improve the energy conversion for a four-stroke free-piston engine
Author(s): Tempelhagen, Robin
Gerlach, AndreasLook up in the Integrated Authority File of the German National Library
Benecke, Sebastian
Klepatz, Kevin
Leidhold, Roberto
Rottengruber, HermannLook up in the Integrated Authority File of the German National Library
Issue Date: 2021
Type: Article
Language: English
URN: urn:nbn:de:gbv:ma9:1-1981185920-790876
Subjects: Free-piston engine
Linear permanent magnet synchronous machine
Efficiency improvement
Abstract: Internal combustion engines with a crankshaft have been successfully developed for many years. They are lacking in the fact that the piston trajectory, i.e., position as a function of time, is limited by the crankshaft motion law. Position-controlled electric linear machines directly coupled to the piston allow to realize free-piston engines. Unlike the crankshaft-based engines, they allow for a higher degree of freedom in shaping the piston trajectory, including adaptive compression ratios, which enables optimal operation with alternative fuels. The possibility of adapting the stroke course results in new degrees of freedom with which the combustion process can be optimized. In this work, four-stroke trajectories with different amplitudes and piston dynamics have been proposed and analyzed regarding efficiency. A simulation model was created based on experimental measurements for testing the proposed trajectories. It could be proved that the variation of the trajectory resulted in an improvement of the overall efficiency. The trajectories were described analytically so that they can be used for a prototype in a future work.
Open Access: Open access publication
License: (CC BY 4.0) Creative Commons Attribution 4.0(CC BY 4.0) Creative Commons Attribution 4.0
Sponsor/Funder: OVGU-Publikationsfonds 2021
Journal Title: Applied Sciences
Publisher: MDPI
Publisher Place: Basel
Volume: 11
Issue: 13
Original Publication: 10.3390/app11135981
Page Start: 1
Page End: 30
Appears in Collections:Fakultät für Maschinenbau (OA)

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