Determination of Optimal Piston Trajectories for High Efficiency 4-Stroke Cycles by Using Predictive Combustion Modeling
The potential regarding the indicated efficiency of an alternative piston trajectory for a spark ignited methane combustion engine has been investigated in this study. A physics-based cylinder model including a predictive combustion model was used to account for the interaction of the thermodynamics...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-10-01
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| Series: | Thermo |
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| Online Access: | https://www.mdpi.com/2673-7264/2/4/24 |
| _version_ | 1797455106825781248 |
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| author | Clemens Biet Sören Krebs |
| author_facet | Clemens Biet Sören Krebs |
| author_sort | Clemens Biet |
| collection | DOAJ |
| description | The potential regarding the indicated efficiency of an alternative piston trajectory for a spark ignited methane combustion engine has been investigated in this study. A physics-based cylinder model including a predictive combustion model was used to account for the interaction of the thermodynamics with altered kinematics. Using a genetic optimization algorithm on an adjustable spline, piston trajectories for different piston acceleration limits have been found for both full and part load operating points. All optimization processes led to increased indicated efficiencies up to a maximum of 52%. The increase in efficiency of the optimized piston trajectory is analyzed based on the results of the numeric simulation and can be explained by the following effects: deeper expansion of the working gas, reduced pumping losses, reduced wall heat losses, shorter heat release, and increased trapped air mass. |
| first_indexed | 2024-03-09T15:47:47Z |
| format | Article |
| id | doaj.art-8331753801144aaea8636166824469aa |
| institution | Directory Open Access Journal |
| issn | 2673-7264 |
| language | English |
| last_indexed | 2024-03-09T15:47:47Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Thermo |
| spelling | doaj.art-8331753801144aaea8636166824469aa2023-11-24T18:23:42ZengMDPI AGThermo2673-72642022-10-012435237010.3390/thermo2040024Determination of Optimal Piston Trajectories for High Efficiency 4-Stroke Cycles by Using Predictive Combustion ModelingClemens Biet0Sören Krebs1Chair of Integrated Modelling of Efficient Powertrains, Technische Universität Berlin, Carnotstraße 1a, 10587 Berlin, GermanyChair of Integrated Modelling of Efficient Powertrains, Technische Universität Berlin, Carnotstraße 1a, 10587 Berlin, GermanyThe potential regarding the indicated efficiency of an alternative piston trajectory for a spark ignited methane combustion engine has been investigated in this study. A physics-based cylinder model including a predictive combustion model was used to account for the interaction of the thermodynamics with altered kinematics. Using a genetic optimization algorithm on an adjustable spline, piston trajectories for different piston acceleration limits have been found for both full and part load operating points. All optimization processes led to increased indicated efficiencies up to a maximum of 52%. The increase in efficiency of the optimized piston trajectory is analyzed based on the results of the numeric simulation and can be explained by the following effects: deeper expansion of the working gas, reduced pumping losses, reduced wall heat losses, shorter heat release, and increased trapped air mass.https://www.mdpi.com/2673-7264/2/4/24internal combustion enginepiston trajectorycubic Hermite splinespredictive combustion modelingefficiencyvariable expansion ratio |
| spellingShingle | Clemens Biet Sören Krebs Determination of Optimal Piston Trajectories for High Efficiency 4-Stroke Cycles by Using Predictive Combustion Modeling Thermo internal combustion engine piston trajectory cubic Hermite splines predictive combustion modeling efficiency variable expansion ratio |
| title | Determination of Optimal Piston Trajectories for High Efficiency 4-Stroke Cycles by Using Predictive Combustion Modeling |
| title_full | Determination of Optimal Piston Trajectories for High Efficiency 4-Stroke Cycles by Using Predictive Combustion Modeling |
| title_fullStr | Determination of Optimal Piston Trajectories for High Efficiency 4-Stroke Cycles by Using Predictive Combustion Modeling |
| title_full_unstemmed | Determination of Optimal Piston Trajectories for High Efficiency 4-Stroke Cycles by Using Predictive Combustion Modeling |
| title_short | Determination of Optimal Piston Trajectories for High Efficiency 4-Stroke Cycles by Using Predictive Combustion Modeling |
| title_sort | determination of optimal piston trajectories for high efficiency 4 stroke cycles by using predictive combustion modeling |
| topic | internal combustion engine piston trajectory cubic Hermite splines predictive combustion modeling efficiency variable expansion ratio |
| url | https://www.mdpi.com/2673-7264/2/4/24 |
| work_keys_str_mv | AT clemensbiet determinationofoptimalpistontrajectoriesforhighefficiency4strokecyclesbyusingpredictivecombustionmodeling AT sorenkrebs determinationofoptimalpistontrajectoriesforhighefficiency4strokecyclesbyusingpredictivecombustionmodeling |