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Real-Time Predictive Modeling of Combustion and NO x Formation in Diesel Engines Under Transient Conditions
Technical Paper
2012-01-0899
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The present work has the aim of developing a fast approach for the predictive calculation of in-cylinder combustion temperatures and NOx formation in diesel engines, under steady state and transient conditions. The model has been tested on a PC, and found to require very little computational time, thus suggesting it could be implemented in the ECU (Engine Control Unit) of engines for model-based control tasks. The method starts with the low-throughput predictive combustion model that was previously developed by the authors, which allows the predictive estimation of the heat-release rate and of the in-cylinder pressure trace to be made on the basis of the injection parameters and of a few quantities measured by the ECU, such as the intake manifold pressure and temperature. A three-zone thermodynamic model is used for the in-cylinder temperature evaluation: the combustion chamber is divided into a vapor fuel zone, an unburned gas zone and a stoichiometric burned gas zone, to which the energy and mass conservation equations are applied. The temperature values are calculated by means of second-order polynomial equations. The temperature evaluation allows the in-cylinder NOx concentration to be calculated by means of the prompt and Zeldovich thermal mechanisms. The procedure also takes into account the intake charge NOx concentration, and is therefore suitable for both engines equipped with traditional short-route EGR (Exhaust Gas Recirculation) systems, and engines equipped with SCR (Selective Catalytic Reduction) and long-route EGR systems. The tuning parameters of the combustion model for pressure estimation were calibrated on six NEDC (New European Driving Cycle) key-points, by means of the DoE (Design of Experiment) methodology, while the thermodynamic model did not require any specific calibration. The NOx model features a single calibration coefficient, which is mainly engine dependent. NOx prediction can be further improved, for a specific engine, by changing the model tuning coefficient as a function of the engine load. The complete model was applied to analyze steady state operating conditions and the urban and extra-urban phases of the NEDC cycle in a modern EURO V low-CR (Compression Ratio) diesel engine, equipped with piezo-driven injectors. A very good matching was found with experimental results in terms of in-cylinder pressure and NOx emissions, with very little computational effort.
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Finesso, R. and Spessa, E., "Real-Time Predictive Modeling of Combustion and NOx Formation in Diesel Engines Under Transient Conditions," SAE Technical Paper 2012-01-0899, 2012, https://doi.org/10.4271/2012-01-0899.Also In
References
- Catania, A. d' Ambrosio, S. Finesso, R. Spessa, E. et al. “Combustion System Optimization of a Low Compression-Ratio PCCI Diesel Engine for Light-Duty Application,” SAE Int. J. Engines 2 1 1314 1326 2009 10.4271/2009-01-1464
- Catania, A.E. Finesso, R. Spessa, E. “Predictive Zero-Dimensional Combustion Model for DI Diesel Engine Feed-Forward Control” Energy Conversion and Management 52 10 September 2011 3159 3175 2011 Elsevier 0196-8904 http://dx.doi.org/10.1016/j.enconman.2011.05.003
- Catania, A. Finesso, R. Spessa, E. Catanese, A. et al. “Combustion Prediction by a Low-Throughput Model in Modern Diesel Engines,” SAE Int. J. Engines 4 1 2106 2123 2011 10.4271/2011-01-1410
- Ericson, C. Westerberg, B. Andersson, M. Egnell, R. “Modelling Diesel Engine Combustion and NOx Formation for Model Based Control and Simulation of Engine and Exhaust Aftertreatment Systems,” SAE Technical Paper 2006-01-0687 2006 10.4271/2006-01-0687
- Chmela, F. Orthaber, G. “Rate of Heat Release Prediction for Direct Injection Diesel Engines Based on Purely Mixing Controlled Combustion,” SAE Technical Paper 1999-01-0186 1999 10.4271/1999-01-0186
- Egnell, R. “A Simple Approach to Studying the Relation between Fuel Rate Heat Release Rate and NO Formation in Diesel Engines,” SAE Technical Paper 1999-01-3548 1999 10.4271/1999-01-3548
- Catania, A. Finesso, R. Spessa, E. “Real-Time Calculation of EGR Rate and Intake Charge Oxygen Concentration for Misfire Detection in Diesel Engines,” SAE Technical Paper 2011-24-0149 2011 10.4271/2011-24-0149
- Andersson, M. Johansson, B. Hultqvist, A. 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
- Kalogirou, SA Artificial intelligence for the modeling and control of combustion processes: a review Progress Energy Combust Sci 2003 29 515 66
- Thompson, GJ Atkinson, CM Clark, NN Long, TW Hanzevack, E Neural network modeling of the emissions and performance of a heavy-duty diesel engine Proc Inst Mech Eng Part D J Automob Eng 2001 214 D2 111 26
- Du, H Zhang, L Shi, X Reconstructing cylinder pressure from vibration signals based on radial basis function networks Proc Inst Mech Eng Part D: J Automob Eng 2001 215 D6 761 7
- Wang, J. Zhang, Y. Xiong, Q. Ding, X. “NO x Prediction by Cylinder Pressure Based on RBF Neural Network in Diesel Engine” 2010 International Conference on Measuring Technology and Mechatronics Automation 13 14 March 2010
- Arrègle, J. López, J. Guardiola, C. Monin, C. “Sensitivity Study of a NOx Estimation Model for On-Board Applications,” SAE Technical Paper 2008-01-0640 2008 10.4271/2008-01-0640
- Guardiola, C. López, J.J. Martín, J. García-Sarmiento, D. “Semiempirical in-cylinder pressure based model for NO x prediction oriented to control applications” Applied Thermal Engineering 31 2011 3275 3286 2011
- Baratta, M. Catania, A.E. Ferrari, A. Finesso, R. Spessa, E. “Premixed-Diffusive Multizone Model for Combustion Diagnostics in Conventional and PCCI Diesel Engines” Journal of Engineering for Gas Turbines and Power 133 10 102801-1 102801-13 October 2011 0742-4795 10.1115/1.4003048
- Catania, A. Finesso, R. Spessa, E. “Diagnostics of Mixing Process Dynamics, Combustion and Emissions in a Euro V Diesel Engine,” SAE Technical Paper 2011-24-0018 2011 10.4271/2011-24-0018
- Finesso, R. Spessa, E. “Analysis of Combustion and Emissions in a Euro V Diesel Engine by Means of A Refined Quasi-Dimensional Multizone Diagnostic Model,” SAE Technical Paper 2012-01-1066 2012
- Dec, J. “A Conceptual Model of DI Diesel Combustion Based on Laser-Sheet Imaging,” SAE Technical Paper 970873 1997 10.4271/970873
- Heywood, J.B. “Internal Combustion Engine Fundamentals” McGraw-Hill Intern. Editions 1988
- Miller, R. Davis, G. Lavoie, G. Newman, C. et al. “A Super-Extended Zel'dovich Mechanism for Nox Modeling and Engine Calibration,” SAE Technical Paper 980781 1998 10.4271/980781
- Catania, A. d'Ambrosio, S. Ferrari, A. Finesso, R. et al. “Experimental Analysis of Combustion Processes and Emissions in a 2.0L Multi-Cylinder Diesel Engine Featuring a New Generation Piezo-Driven Injector,” SAE Technical Paper 2009-24-0040 2009 10.4271/2009-24-0040