Transient Momentum Balance—A Method for Improving the Performance of Mean-Value Engine Plant Models
Mean-value engine models (MVEMs) are frequently applied in system-level simulations of vehicle powertrains. In particular, MVEMs are a common choice in engine simulators, where real-time execution is mandatory. In the case of real-time applications with prescribed, fixed sampling times, the use of e...
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2013-06-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | http://www.mdpi.com/1996-1073/6/6/2892 |
| _version_ | 1811302024730378240 |
|---|---|
| author | Tomaž Katrašnik |
| author_facet | Tomaž Katrašnik |
| author_sort | Tomaž Katrašnik |
| collection | DOAJ |
| description | Mean-value engine models (MVEMs) are frequently applied in system-level simulations of vehicle powertrains. In particular, MVEMs are a common choice in engine simulators, where real-time execution is mandatory. In the case of real-time applications with prescribed, fixed sampling times, the use of explicit integration schemes is almost mandatory. Thus the stability of MVEMs is one of the main limitations when it comes to optimizing their performance. It is limited either by the minimum size of the gas volume elements or by the maximum integration time step. An innovative approach that addresses both constraints arises from the fact that the mass flow through the transfer elements of the MVEM is not modelled considering the quasi-steady assumption, but instead the mass-flow is calculated using a single transient momentum balance (TMB) equation. The proposed approach closely resembles phenomena in the physical model, since it considers both the flow-field history and the inertial effects arising from the time variation of the mass flow. It is shown in this paper that a consideration of the TMB equation improves the stability and/or the computational speed of the MVEMs, whereas it also makes it possible to capture physical phenomena in a more physically plausible manner. |
| first_indexed | 2024-04-13T07:19:14Z |
| format | Article |
| id | doaj.art-a3ca93e648754ac197276ca1df8f3d63 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-13T07:19:14Z |
| publishDate | 2013-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-a3ca93e648754ac197276ca1df8f3d632022-12-22T02:56:39ZengMDPI AGEnergies1996-10732013-06-01662892292610.3390/en6062892Transient Momentum Balance—A Method for Improving the Performance of Mean-Value Engine Plant ModelsTomaž KatrašnikMean-value engine models (MVEMs) are frequently applied in system-level simulations of vehicle powertrains. In particular, MVEMs are a common choice in engine simulators, where real-time execution is mandatory. In the case of real-time applications with prescribed, fixed sampling times, the use of explicit integration schemes is almost mandatory. Thus the stability of MVEMs is one of the main limitations when it comes to optimizing their performance. It is limited either by the minimum size of the gas volume elements or by the maximum integration time step. An innovative approach that addresses both constraints arises from the fact that the mass flow through the transfer elements of the MVEM is not modelled considering the quasi-steady assumption, but instead the mass-flow is calculated using a single transient momentum balance (TMB) equation. The proposed approach closely resembles phenomena in the physical model, since it considers both the flow-field history and the inertial effects arising from the time variation of the mass flow. It is shown in this paper that a consideration of the TMB equation improves the stability and/or the computational speed of the MVEMs, whereas it also makes it possible to capture physical phenomena in a more physically plausible manner.http://www.mdpi.com/1996-1073/6/6/2892mean-value engine modelgas pathtransient momentum balancestabilitycomputational speed |
| spellingShingle | Tomaž Katrašnik Transient Momentum Balance—A Method for Improving the Performance of Mean-Value Engine Plant Models Energies mean-value engine model gas path transient momentum balance stability computational speed |
| title | Transient Momentum Balance—A Method for Improving the Performance of Mean-Value Engine Plant Models |
| title_full | Transient Momentum Balance—A Method for Improving the Performance of Mean-Value Engine Plant Models |
| title_fullStr | Transient Momentum Balance—A Method for Improving the Performance of Mean-Value Engine Plant Models |
| title_full_unstemmed | Transient Momentum Balance—A Method for Improving the Performance of Mean-Value Engine Plant Models |
| title_short | Transient Momentum Balance—A Method for Improving the Performance of Mean-Value Engine Plant Models |
| title_sort | transient momentum balance a method for improving the performance of mean value engine plant models |
| topic | mean-value engine model gas path transient momentum balance stability computational speed |
| url | http://www.mdpi.com/1996-1073/6/6/2892 |
| work_keys_str_mv | AT tomazkatrasnik transientmomentumbalanceamethodforimprovingtheperformanceofmeanvalueengineplantmodels |