This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Calibration Methodology in System Simulation to Predict Heat Transfer Along the Exhaust Line of a Diesel Engine
Technical Paper
2014-01-1184
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Emission regulations have become increasingly stringent in recent years. Current regulations need the development of a new worldwide driving cycle which gives greater weight to the pollutants emitted during transient phases or cold starts. Powertrains contain a large number of components such as multistage turbocharger systems; exhaust gas recirculation, after-treatment devices and sometimes an electric motor. In this context, 0D predictive models of heat transfer in the exhaust line, calibrated with experimental data, are particularly interesting. Many investigations are related to the development of precise control laws in order to optimize the light-off of after-treatment elements during the engine starting phase. A better understanding of the thermal phenomena occurring in the exhaust line is necessary.
To study the heat transfer in the exhaust line of a Diesel engine during transient conditions, the temperature in the exhaust line must be known precisely. The experimental methodology followed by the authors contains three steps: first, temperature and pressure drops are made on a pulse generator to characterize properly each thermocouple (four different diameters). Then, the second step is to study the temperature during different types of transient tests on a Diesel engine equipped with an “empty” exhaust line (i.e. without any after-treatment system). Finally, the same tests are done on the engine equipped with a second exhaust line that contains a close-coupled DOC/DPF.
Various types of tests have been performed on the test bench. Some of them are presented in this study : a quasi-steady state test which consists in starting the engine and stabilizing the engine speed and the IMEP at specific values, a transition test which consists in varying the IMEP while the engine speed is kept constant, and an ECE cycle with both engine speed and IMEP varying. The two first tests presented here have been done at a starting temperature of 15 °C, the ECE cycle has been carried out at a starting temperature of −7 °C. The next step is to use these tests and calibrations of the thermocouples to develop a methodology that calibrates heat transfer in a simulator of an exhaust line developed under Matlab/Simulink + AMESim platform.
Recommended Content
Authors
Topic
Citation
Belhassein, B., Chalet, D., Chesse, P., Alix, G. et al., "Calibration Methodology in System Simulation to Predict Heat Transfer Along the Exhaust Line of a Diesel Engine," SAE Technical Paper 2014-01-1184, 2014, https://doi.org/10.4271/2014-01-1184.Also In
References
- Zidat , S. and Parmentier , M. Exhaust Manifold Design to Minimize Catalyst Light-off Time SAE Technical Paper 2003-01-0940 2003 10.4271/2003-01-0940
- Son , S. and Kolasa , A. Estimating Actual Exhaust Gas Temperature from Raw Thermocouple Measurements Acquired During Transient and Steady State Engine Dynamometer Tests SAE Technical Paper 2007-01-0335 2007 10.4271/2007-01-0335
- El-Sharkawy , A. Analysis of Thermocouple Temperature Response under Actual Vehicle Test Conditions SAE Technical Paper 2008-01-1175 2008 10.4271/2008-01-1175
- Castillo , F. , Witrant , E. , Dugard , L. , Talon , V. et al. Intra-Pipe Restriction Non-Homentropic Boundary Resolution Method SAE Technical Paper 2013-01-0582 2013 10.4271/2013-01-0582
- Preston-Thomas , H. The International Temperature Scale of 1990 (ITS-90) Metrologia 2 3 10 1990
- Kar , K. , Roberts , S. , Stone , R. , Oldfield , M. et al. SAE Technical Paper 2004-01-1418 2004 10.4271/2004-01-1418
- Kee , R. , Hung , P. , Fleck , B. , Irwin , G. et al. Fast Response Exhaust Gas Temperature Measurement in IC Engines SAE Technical Paper 2006-01-1319 2006 10.4271/2006-01-1319
- Tagawa , M. and Ohta , Y. Two-thermocouple probe for fluctuating temperature measurement in combustion - Rational estimation of mean and fluctuating time constants Combustion and Flame 109 549 560 1997 10.1016/S0010-2180(97)00044-8
- Bannister , C. , Brace , C. , Lock , G. , Taylor , J. et al. Experimental Characterisation of Heat Transfer in Exhaust Pipe Sections SAE Int. J. Mater. Manuf. 1 1 136 144 2009 10.4271/2008-01-0391
- He , Y. , Battiston , P. , and Alkidas , A. Thermal Studies in the Exhaust Manifold of a Turbocharged V6 Diesel Engine Operating Under Steady-State Conditions SAE Technical Paper 2006-01-0688 2006 10.4271/2006-01-0688
- Laget , O. , Pacaud , P. and Perrin , H. Cold start on low compression ratio Diesel engine : experimental and 3D RANS computation investigations Oil & Gas Science and Technology - Rev. IFP 64 2009 3 407 429 10.2516/ogst/2009013