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Evaluating the Effect of Two-Stage Turbocharger Configurations on the Perceived Vehicle Acceleration Using Numerical Simulation
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 5, 2016 by SAE International in United States
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Charge boosting strategy plays an essential role in improving the power density of diesel engines while meeting stringent emissions regulations. In downsized two-stage turbocharged engines, turbocharger matching is critical to achieve desired boost pressure while maintaining sufficiently fast transient response. A numerical simulation model is developed to evaluate the effect of two-stage turbocharger configurations on the perceived vehicle acceleration. The simulation model developed in GT-SUITE consists of engine, drivetrain, and vehicle dynamics sub-models. A model-based turbocharger control logic is developed in MATLAB using an analytical compressor model and a mean-value engine model.
The components of the two-stage turbocharging system evaluated in this study include a variable geometry turbine in the high-pressure stage, a compressor bypass valve in the low-pressure stage and an electrically assisted turbocharger in the low-pressure stage. Simulation results show excellent agreements with the test data. The results also indicate that the maximum acceleration and the time needed to reach the maximum can be improved by more than 25%, and more desirable linear acceleration profile can be achieved if a variable geometry turbine and a larger compressor are used in the high-pressure stage and a compressor bypass valve in the low-pressure stage. It is also found that the perceived vehicle acceleration has a strong correlation with the rate of turbocharger speed increase in the low-pressure stage. The observers predict the turbocharger speed and the exhaust gas temperature within 5% errors. The GTSUITE simulation model is also used for observer evaluation and control strategy development.
CitationKang, J., Lee, B., and Jung, D., "Evaluating the Effect of Two-Stage Turbocharger Configurations on the Perceived Vehicle Acceleration Using Numerical Simulation," SAE Technical Paper 2016-01-1029, 2016, https://doi.org/10.4271/2016-01-1029.
- Langen Peter, Hall Wolfgang, Nefischer Peter and Hiemesch Detlef, “The New Two-stage Turbocharged Six-cylinder Diesel Engine of the BMW 740d,” MTZ Volume 71, 2010.
- Honeder Josef, Ardey Nikolai, Kaufmann Martin and Steinmayr Thaddäus, “The New BMW 4-/6-Cylinder Diesel Engine with 2-Stage Turbocharging,” 20th Aachen Colloquium, Automobile and Engine Technology, Aachen, 2011.
- Watel, E., Pagot, A., Pacaud, P., and Schmitt, J., "Matching and Evaluating Methods for Euro 6 and Efficient Two-stage Turbocharging Diesel Engine," SAE Technical Paper 2010-01-1229, 2010, doi:10.4271/2010-01-1229.
- Westin, F. and Burenius, R., "Measurement of Interstage Losses of a Twostage Turbocharger System in a Turbocharger Test Rig," SAE Technical Paper 2010-01-1221, 2010, doi:10.4271/2010-01-1221.
- Plianos, A. and Stobart, R., "Modeling and Control of Diesel Engines Equipped with a Two-Stage Turbo-System," SAE Technical Paper 2008-01-1018, 2008, doi:10.4271/2008-01-1018.
- Kang, J., Lee, J., Song, H., and Lee, D., "Enhancing Power Density with Two-Stage Turbochargers," SAE Technical Paper 2012-01-0709, 2012, doi:10.4271/2012-01-0709.
- Ghojel J. I., “Review of the Development and Applications of the Wiebe Function: A Tribute to the Contribution of Ivan Wiebe to Engine Research,” Int. J. Engine Res. 11(4):297-312, 2010, doi:10.1243/14680874JER06510.
- Witt, H., Hassenforder, M., and Gissinger, G., "Modelling and Identification of a Diesel Combustion Process with the Downhill Gradient Search Method," SAE Technical Paper 950854, 1995, doi:10.4271/950854.
- 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, doi:10.4271/1999-01-3548.
- Kumar, R., Reader, G., and Zheng, M., "A Preliminary Study of Ignition Consistency and Heat Release Analysis for a Common-Rail Diesel Engine," SAE Technical Paper 2004-01-0932, 2004, doi:10.4271/2004-01-0932.
- Lee B., Jung D., Kim Y., and Nieuwstadt M., “Thermodynamics-Based Mean Value Model for Diesel Combustion,” ASME J. Engineering for gas turbines and power, 135(9), 2013, doi:10.1115/1.4024757.
- Watson N., and Janota M. S., “Turbocharging the Internal Combustion Engine,” John Wiley & Sons, 1982.
- Wiesner, F. J., “A Review of Slip Factors for Centrifugal Impellers,” ASME Publication 66-WA-FE-18, 1966.
- Jensen, J., Kristensen, A., Sorenson, S., Houbak, N. et al., "Mean Value Modeling of a Small Turbocharged Diesel Engine," SAE Technical Paper 910070, 1991, doi:10.4271/910070.