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Physics-Based Exhaust Pressure and Temperature Estimation for Low Pressure EGR Control in Turbocharged Gasoline Engines
Technical Paper
2016-01-0575
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Low pressure (LP) and cooled EGR systems are capable of increasing fuel efficiency of turbocharged gasoline engines, however they introduce control challenges. Accurate exhaust pressure modeling is of particular importance for real-time feedforward control of these EGR systems since they operate under low pressure differentials. To provide a solution that does not depend on physical sensors in the exhaust and also does not require extensive calibration, a coupled temperature and pressure physics-based model is proposed. The exhaust pipe is split into two different lumped sections based on flow conditions in order to calculate turbine-outlet pressure, which is the driving force for LP-EGR. The temperature model uses the turbine-outlet temperature as an input, which is known through existing engine control models, to determine heat transfer losses through the exhaust. Temperature output is used in the pressure model to estimate pressure losses in the two sections of the pipe starting from post-catalyst (ambient) conditions. Experimental data is used to calibrate a total of six parameters in the pressure and steady-state temperature models. Transient experiments are utilized to calibrate the dynamic behavior of the temperature model, which is captured by a low-pass filter to reduce computational effort. A turbocharged gasoline engine, equipped with a LP-EGR loop, is used for real-time transient validation of the coupled model. The newly presented model demonstrates an absolute pressure prediction error of less than 1 kPa with mean error of 0.15 kPa and standard deviation of 0.13 kPa over the validation range.
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Siokos, K., Koli, R., Prucka, R., Schwanke, J. et al., "Physics-Based Exhaust Pressure and Temperature Estimation for Low Pressure EGR Control in Turbocharged Gasoline Engines," SAE Technical Paper 2016-01-0575, 2016, https://doi.org/10.4271/2016-01-0575.Also In
References
- Siokos , K. , Koli , R. , Prucka , R. , Schwanke , J. et al. Assessment of Cooled Low Pressure EGR in a Turbocharged Direct Injection Gasoline Engine SAE Int. J. Engines 8 4 1535 1543 2015 10.4271/2015-01-1253
- Alger , T. , Chauvet , T. , and Dimitrova , Z. Synergies between High EGR Operation and GDI Systems SAE Int. J. Engines 1 1 101 114 2009 10.4271/2008-01-0134
- Hoepke , B. , Jannsen , S. , Kasseris , E. , and Cheng , W. EGR Effects on Boosted SI Engine Operation and Knock Integral Correlation SAE Int. J. Engines 5 2 547 559 2012 10.4271/2012-01-0707
- Takaki , D. , Tsuchida , H. , Kobara , T. , Akagi , M. et al. Study of an EGR System for Downsizing Turbocharged Gasoline Engine to Improve Fuel Economy SAE Technical Paper 2014-01-1199 2014 10.4271/2014-01-1199
- Liu , F. and Pfeiffer , J. Estimation Algorithms for Low Pressure Cooled EGR in Spark-Ignition Engines SAE Int. J. Engines 8 4 1652 1659 2015 10.4271/2015-01-1620
- Chiara , F. , Canova , M. , and Wang. , Y. An Exhaust Manifold Pressure Estimator for a Two-Stage Turbocharged Diesel Engine 2011 American Control Conference USA June 29 - July 1, 2011
- Fredriksson , J. , and Egardt , B. Estimating Exhaust Manifold Pressure in a Turbocharged Diesel Engine Proceedings of the 2002 International Conference on Control Applications 2 701 706 2002
- Buckland , J. , Jankovic , M. , Grizzle , J. , and Freudenberg , J. Estimation of Exhaust Manifold Pressure in Turbocharged Gasoline Engines with Variable Valve Timing 2008 ASME Dynamic Systems and Control Conference USA October 20-22, 2008
- Castillo , F. , Witrant , E. , Dugard , L. , and Talon , V. Exhaust Manifold Pressure Estimation Diesel Equipped with a VGT Turbocharger SAE Technical Paper 2013-01-1752 2013 10.4271/2013-01-1752
- Olin , P. A Mean-Value Model for Estimating Exhaust Manifold Pressure in Production Engine Applications SAE Technical Paper 2008-01-1004 2008 10.4271/2008-01-1004
- Eriksson , L. Mean Value Models for Exhaust System Temperatures SAE Technical Paper 2002-01-0374 2002 10.4271/2002-01-0374
- Fu , H. , Chen , X. , Shilling , I. , and Richardson , S. A One-Dimensional Model for Heat Transfer in Engine Exhaust Systems SAE Technical Paper 2005-01-0696 2005 10.4271/2005-01-0696
- Srun Ngy Exhaust Heat Exchange in a Pipe of an Internal Combustion Engine. EGR Cooler and Passenger Compartment Heating Applications Seoul 2000 FISITA World Automotive Congress Korea June 12-15, 2000
- Tsinoglou , D. , Koltsakis , G. , Missirlis , D. , and Yakinthos , K. Transient modelling of flow distribution in automotive catalytic converters Applied Mathematical Modelling 28 775 794 2004
- Weast , R. CRC Handbook of Chemistry and Physics 65 th Boca Raton CRC Press 1984 0849304652
- Crane Co. Flow of Fluids through Valves, Fittings, and Pipe, Technical Paper No. 410 Stamford Crane 2009 1-40052-712-0
- Mansouri , S. , and Heywood , J. Correlations for the Viscosity and Prandtl Number of Hydrocarbon-Air Combustion Products Combustion Science and Technology 23 251 256 1980