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Virtual NOx sensor for Transient Operation in Light-Duty Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 05, 2016 by SAE International in United States
Annotation ability available
Currently, diesel engine-out exhaust NOx emission level prediction is a major challenge for complying with the stricter emission legislation and for control purpose of the after-treatment system. Most of the NOx prediction research is based on the Zeldovich thermal mechanism, which is reasonable from the physical point of view and for its simplicity. Nevertheless, there are some predictable range limitations, such as low temperature with high EGR rate operating conditions or high temperature with low EGR rates.
In the present paper, 3 additional considerations, pilot burned gas mixing before the main injection; major NO formation area; concentration correction, were applied to the previously developed real-time NO estimation model based on in-cylinder pressure and data available from ECU. The model improvement was verified on a 1.6 liter EURO5 diesel engine in both steady and transient operation. These considerations expand the predictable NO concentration range from 15 ppm up to 1461 ppm in the steady state conditions with an R2-value of near 0.98, although EGR rate, main injection timing, boost pressure and rail pressure varied. In addition, the NOx prediction results during the WLTP cycle matched the portable NOx sensor and HORIBA MEXA 7100.
This virtual NOx sensor concept might be useful as an engine emission calibration tool, for real-time control of exhaust NOx emission levels, and as an alerting system for the on-board NOx sensor malfunction.
CitationLee, S., Lee, Y., Han, K., Lee, K. et al., "Virtual NOx sensor for Transient Operation in Light-Duty Diesel Engine," SAE Technical Paper 2016-01-0561, 2016, https://doi.org/10.4271/2016-01-0561.
- Mock Peter , Kühlwein Jörg , Tietge Uwe , Franco Vicente et al. The WLTP: How a new test procedure for cars will affect fuel consumption values in the EU International Council on Clean Transportation 2014
- Sarangi , A. , McTaggart-Cowan , G. , and Garner , C. The Effects of Intake Pressure on High EGR Low Temperature Diesel Engine Combustion SAE Technical Paper 2010-01-2145 2010 10.4271/2010-01-2145
- Kimura , S. , Aoki , O. , Kitahara , Y. , and Aiyoshizawa , E. Ultra-Clean Combustion Technology Combining a Low-Temperature and Premixed Combustion Concept for Meeting Future Emission Standards SAE Technical Paper 2001-01-0200 2001 10.4271/2001-01-0200
- Colban , W. , Miles , P. , and Oh , S. Effect of Intake Pressure on Performance and Emissions in an Automotive Diesel Engine Operating in Low Temperature Combustion Regimes SAE Technical Paper 2007-01-4063 2007 10.4271/2007-01-4063
- Alriksson , M. and Denbratt , I. Low Temperature Combustion in a Heavy Duty Diesel Engine Using High Levels of EGR SAE Technical Paper 2006-01-0075 2006 10.4271/2006-01-0075
- Forzatti Pio , Lietti Luca , Nova Isabella and Tronconi Enrico Diesel NO x aftertreatment catalytic technologies: Analogies in LNT and SCR catalytic chemistry Catalysis Today 151 2010 10.1016/j.cattod.2010.02.025
- Theis , J. and Gulari , E. A LNT+SCR System for Treating the NOx Emissions from a Diesel Engine SAE Technical Paper 2006-01-0210 2006 10.4271/2006-01-0210
- Kihas , D. and Uchanski , M. Engine-Out NOx Models for on-ECU Implementation: A Brief Overview SAE Technical Paper 2015-01-1638 2015 10.4271/2015-01-1638
- d’Ambrosio Stefano , Finesso Roberto , Fu Lezhong , Mittica Antonio et al. A control-oriented real-time semi-empirical model for the prediction of NOx emissions in diesel engines Applied Energy 130 2014 10.1016/j.apenergy.2014.05.046
- Andersson , M. , Johansson , B. , Hultqvist , A. , and Noehre , C. A Predictive Real Time NOx Model for Conventional and Partially Premixed Diesel Combustion SAE Technical Paper 2006-01-3329 2006 10.4271/2006-01-3329
- Del Re Luigi , Allgöwer Frank , Glielmo Luigi , Guardiola Carlos et al. Automotive model predictive control: models, methods and applications 402 2010 Springer
- Park Wonah , Lee Junyong , Min Kyoungdoug , Yu Jun et al. Prediction of real-time NO based on the in-cylinder pressure in Diesel engines Proceedings of the Combustion Institute 34 2013 10.1016/j.proci.2012.06.170
- Lee , J. , Lee , S. , Park , W. , Min , K. et al. The Development of Real-time NOx Estimation Model and its Application SAE Technical Paper 2013-01-0243 2013 10.4271/2013-01-0243
- Lee Seungha , Lee Youngbok , Han Kyoungchan , Lee Kyoungmin et al. Control-Oriented Virtual NOx Sensor in Light-Duty Diesel Engine Energy conversion and management
- Musculus , M. On the Correlation between NOx Emissions and the Diesel Premixed Burn SAE Technical Paper 2004-01-1401 2004 10.4271/2004-01-1401
- Le , M. and Kook , S. Injection Pressure Effects on the Flame Development in a Light-Duty Optical Diesel Engine SAE Int. J. Engines 8 2 609 624 2015 10.4271/2015-01-0791