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Fast Physical Emission Predictions for Off-line Calibration of Transient Control Strategies
ISSN: 0148-7191, e-ISSN: 2688-3627
Published June 15, 2009 by SAE International in United States
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A clear trend in engine development is that the engines are becoming more and more complex both regarding components and component-systems as well as controlling them. These complex engines have great potential to minimize emissions but they also have a great number of combinations of setting. Systematic testing to find these optimum settings is getting more and more challenging. A possible remedy is to roughly optimize these settings offline with predictive models and then only perform the fine tuning in the engine test bed. To be able to do so, two things are needed; firstly a engine model that will predict how the different setting affect engine performance and secondly how the engine performance affects the emissions.
A new approach for predicting soot emissions has previously been presented  where the frame of the model was a multizone approach developed for NO formation prediction. Soot was, in the presented model, predicted by assuming that a roughly constant fraction of the fuel remains as soot on the lean side of the flame and thereafter modelling the conditions for post-flamefront soot oxidation. The post-flamefront oxidation is assumed to be dominated by surface oxidation, modelled with the Nagle and Strickland Constable oxidation model. The model showed good agreement with measured emissions for both NOx and soot over a wide range of operating conditions with conventional diesel combustion.
In this article some examples of transient control strategies have been tested and the engine performance and emissions have been measured with the main object to test the predictivity of the emission models to see if they are suitable for off-line calibration. The results show that the model predicts the transient emissions of both NO and soot rather well although it is hard to evaluate the soot predictions with high time resolution due to the rather slow measurements. Important model inputs such as air/fuel ratio and EGR rate is also more difficult to measure during transients than during steady state conditions and this can decrease the accuracy of the predictions. However, the advantages and disadvantages of different strategies can be predicted.
CitationWestlund, A. and Ångström, H., "Fast Physical Emission Predictions for Off-line Calibration of Transient Control Strategies," SAE Technical Paper 2009-01-1778, 2009, https://doi.org/10.4271/2009-01-1778.
- Westlund A. Ångström H-E. Fast Physical Prediction of NO and Soot in Diesel Engines, SAE 2009-01-1121 2009
- Winkler N Ångström H-E. Simulations and measurements of a two-stage turbocharged heavy-duty diesel engine including EGR in transient operation, SAE paper 2008-01-0539 2008
- Westlund A Winkler N Diotallevi F. Ångström H.E. Predictions and measurements of transient NO emissions for a two-stage turbocharged HD Diesel engine with EGR, THIESEL 2008 conference proceedings 2008
- Rente T. Injection strategies for Heavy Duty DI Diesel Engines. Doctoral thesis, Chalmers University of Technology 2004
- Heywood J. B. Internal combustion engine fundamentals McGraw-Hill 1998
- Xi J. Zhong B-J. Review: soot in diesel combustion systems. Chemical Engineering Technology 29 6 2006
- Egnell R. On zero-dimensional modeling of combustion and NOx formation in diesel engines. Doctoral thesis, Lund University 2001
- Andersson M. Fast NOx prediction in diesel engines, Licentiate thesis, Lund University 2006
- Desantes J. M. Arregle J. Molina S. Influence of the EGR rate, oxygen concentration and equivalent fuel/air ratio on the combustion behavior and pollutant emissions of a heavy duty diesel engine, SAE 2000-01-1813 2000
- Akihama K. Takatori Y. Inagaki K. Sasaki S. Dean A. M. Mechanism of the smokeless rich combustion by reducing temperature, SAE 2001-01-0655 2001
- Kitamura T Ito T Senda J Fujimoto H. Mechanism of smokeless diesel combustion with oxygenated fuels based on the dependence of the equivalence ratio and temperature on soot particle formation International Journal for Engine Research 3 4 2002
- Saric F. A detailed kinetic model for calculation of the soot partile size distribution function. Doctoral thesis, Lund University 2006
- Netzell K. Development and application of detailed kinetic models for the soot particle size distribution function, Doctoral thesis. Lund University 2006
- Tao F. Liu Y. RempelEwert B.H. Foster D.E Reitz R.D. Choi D. Miles P.C. Modeling the effects of EGR and injection pressure on soot formation in a high speed direct injection (HSDI) diesel engine using a multi-step Phenomenological soot model, SAE 2005-01-0121 2005
- Tao. F. Golovitchev V. I. Chomiak J. A phenomenological model for the prediction of soot formation in diesel spray combustion, Combustion and flame 136 270 282 2004
- Tao. F Srinivas S. Reitz R. D Foster D. E. Comparison of three soot models applied to multidimensional diesel combustion simulations JSME International Journal. Series B 48 2005
- Fusco A. Knox-Kelecy A.L. Foster D.E. Application of a phenomenological soot model to diesel engine combustion, International symposium Comodia 94 1994
- Vlasek K Macek J. Boulouchos K. Simulation of combustion in a heavy duty diesel engine with focus on soot formation, Paper code F02V165
- Boulouchos K. Kirchen P. A phenomenological mean value soot model for transient engine operation, MTZ 07-0812008 69 2008
- Kaario O. Antila E. Larmi M. Applying soot phi-T maps for engineering CFD applications in diesel engines, SAE 2005-01-3856 2005
- Dec J. E. A conceptual model of DI diesel combustion based on laser-sheet imaging, 970873 1997
- Kosaka H. Aizawa T. Kamimoto T. Two-dimensional imaging of ignition and soot formation processes in a diesel flame, International Journal for engine research 6 1 2005
- Charlton S Heavy-Duty Diesel Emission Control Symposium, presentation 2007
- Fabrizio Diotavelli Development of a multi-zone model for NOx formation in diesel engines, Master thesis, KTH Royal Institute of Technology 2007
- Lapuerta M Hernandez J J Armas O Kinetic modelling of gaseous emissions in a diesel engine, SAE paper 2000-01-2939 2000
- Alkidas C. Relationships between smoke measurements and particulate measurements, SAE 840412 1984
- Particle Measurement Programme group, Conclusions n improving particulate mass measurements procedures and new particle number measurements procedures relative to the requirements of the 05 series of amendments to regulation no. 83, GRPE-48-11 2004
- Bernemyr H. Volatility and number measurements of diesel engine exhaust particles. Doctoral thesis, KTH Royal Institute of Technology 2007
- Rydström A-M Kannel A de Serves C Industry report on exhaust particle measurements - a work within the emir1 project, Vinnova Report, vr2007:07 2007
- Westlund A Ångström H-E Evaluation of techniques for transient PM-measurements, SAE paper 2008-01-1680 2008