Next Article in Journal
Experimental Analysis of the Input Variables’ Relevance to Forecast Next Day’s Aggregated Electric Demand Using Neural Networks
Previous Article in Journal
Idle Operation with Low Intake Valve Lift in a Port Fuel Injected Engine
Energies 2013, 6(6), 2892-2926; doi:10.3390/en6062892
Article

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

Received: 20 March 2013; in revised form: 5 June 2013 / Accepted: 6 June 2013 / Published: 14 June 2013
Download PDF [2204 KB, uploaded 14 June 2013]
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.
Keywords: mean-value engine model; gas path; transient momentum balance; stability; computational speed mean-value engine model; gas path; transient momentum balance; stability; computational speed
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Export to BibTeX |
EndNote


MDPI and ACS Style

Katrašnik, T. Transient Momentum Balance—A Method for Improving the Performance of Mean-Value Engine Plant Models. Energies 2013, 6, 2892-2926.

AMA Style

Katrašnik T. Transient Momentum Balance—A Method for Improving the Performance of Mean-Value Engine Plant Models. Energies. 2013; 6(6):2892-2926.

Chicago/Turabian Style

Katrašnik, Tomaž. 2013. "Transient Momentum Balance—A Method for Improving the Performance of Mean-Value Engine Plant Models." Energies 6, no. 6: 2892-2926.


Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert