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Transient Momentum Balance—A Method for Improving the Performance of Mean-Value Engine Plant Models

Author

Listed:
  • Tomaž Katrašnik

    (Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, SI-1000 Ljubljana, Slovenia)

Abstract

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.

Suggested Citation

  • Tomaž Katrašnik, 2013. "Transient Momentum Balance—A Method for Improving the Performance of Mean-Value Engine Plant Models," Energies, MDPI, vol. 6(6), pages 1-35, June.
    • Handle: RePEc:gam:jeners:v:6:y:2013:i:6:p:2892-2926:d:26424
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    References listed on IDEAS

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    1. Norbert Zsiga & Christoph Voser & Christopher Onder & Lino Guzzella, 2013. "Intake Manifold Boosting of Turbocharged Spark-Ignited Engines," Energies, MDPI, vol. 6(3), pages 1-18, March.
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