This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Air-to-Fuel Ratio Control of a Turbocharged Diesel Engine Equipped with EGR Using Fuzzy Logic Controller
Technical Paper
2007-01-0976
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
One of the most vital factors in combustion control is Air-to-Fuel Ratio (AFR) control and estimation. Various parameters such as intake air mass flow rate, fuel injection quantity and (Exhaust Gas Recirculation) EGR flow rate are affecting the AFR magnitude. In this study a detailed mathematical, nonlinear and control oriented model of dynamic processes of turbocharged diesel engines is presented for the purpose of AFR control. It is an attempt to describe the two main subsystems of compression ignition engines called intake manifold and fuel injection systems.
The intake model itself consists of compressor, intercooler, intake manifold, EGR circuit, valve section and cylinder subsystems. This model has been developed for study of the air intake system in a turbocharged diesel engine, using physical equations. Experimental data has also been used to adjust the model. The output variable of this submodel (air mass flow) is a significant parameter in calculations of engine power, emission and AFR control. Of the methods of assisted aspiration, the exhaust gas driven turbocharger is by far the most widely used. Varying the rate of gas flow through the turbine by means of Variable Geometry Turbine (VGT) is a method by which the exhaust gas flow through turbine can be limited at high engine speeds. Therefore, turbocompound in this model is considered to have VGT.
Common Rail Injection (CRI) that is a fully flexible fuel injection system in which quantity, timing and pressure of injection are controllable (based on electronic control) separately is chosen in this study. Fuel injection system is comprised of solenoid, working chamber and needle subsystems. A one-dimensional, transient and compressible flow model of CRI, based on Kirchhoff's law, mass and momentum conservation equations and the equilibrium of forces is derived.
AFR control of diesel engine is performed make use of fuzzy logic methodology. Fuzzy logic is a control structure which emulates the way humans arrive at decisions, given a certain set of circumstances. This method improves the control and simplifies the development process. The fuzzy logic controller achieves this by considerably reduced complexity and lack of tedious mathematical derivation associated with modern control theory methods.
All above-mentioned models are programmed in Matlab/Simulink software environment. The simulation results are then compared with available data to check the accuracy of the model.
Recommended Content
Authors
Topic
Citation
Shamdani, A., Shamekhi, A., Ziabasharhagh, M., and Aghanajafi, C., "Air-to-Fuel Ratio Control of a Turbocharged Diesel Engine Equipped with EGR Using Fuzzy Logic Controller," SAE Technical Paper 2007-01-0976, 2007, https://doi.org/10.4271/2007-01-0976.Also In
References
- Ouenou-Gamo S. Ouladsine M. Rachid A. “Air Intake Theoretical Model and Simulation of a Turbocharger Diesel Engine” Laboratoire des Systemes Automatiques, IEEE 1997
- Kolmanovsky I. Moraal P. Niuwestadt M. Stefanopoulou A. G. “Issues in Modeling and Control of Intake Flow in Variable Geometry Turbocharged Engines” Ford Motor Company, Scientific Research Laboratory 1998
- Jung M. “Mean-Value Modeling and Robust Control of the Air Path of a Turbocharged Diesel Engine” Department of Engineering, University of Cambridge United Kingdom February 2003
- Ahlin K. “Modeling of Pressure Waves in the Common Rail Diesel Injection System” University of Linkoping Sweden December 11 2000
- Gullaksen J. “Simulation of Diesel Fuel Injection Dynamics” Department of mechanical engineering, Technical University of Denmark February 2003
- Lee H.K. Russell M.F. Bae C.B. “Mathematical Model of Diesel Fuel Injection Equipment Incorporating Non-linear Fuel Injection” Proceedings of the IMECHE Part D Journal of Automobile Engineering 216 3 191 204 1 March 2002
- Nyberg M. Stutte T. Wilhelmi V. “Model Based Diagnosis of the Air Path of an Automotive Diesel Engine” DaimlerCrysler AG, Research and Technology (FT2/EA) Stuttgart, Germany 2001
- Ghazimirsaied S.A. Shamdani A.H. Shamekhi A.H. “On the Use of VVT Strategy for the Maximum Volumetric Efficiency in Turbocharged Diesel Engines” Internal Combustion Engine Division of ASME 2006 Spring Technical Conference Aachen, Germany May 7-10 2006
- Theotokatos G. Kyrtatos N.P. “Diesel Engine Transient Operation with Turbocharger Compressor Surging” SAE Technical Conference, 2001-01-1241 2001
- Heywood J. B. “Internal Combustion Engine Fundamentals” McGraw-Hill Book Company 1988
- Salcedo J.V. Pieroni E. Perez E. Blasco X. Martinez M. Garcia J.V. “Real-time Control and Simulation of a Non-linear Model of Air Management in a Turbocharged Diesel Engine” Department of System Engineering and Control, Universidad Politecnica de Valencia Spain 2001
- Cheung N.C. Rahman M.F. Lim K.W. “Simulation and experimental studies towards the development of a proportional solenoid” AUPEC'93 1993
- Tran X.T. “Modeling and Simulation of Electronically Controlled Diesel Injectors” School of Mechanical Engineering, University of New South Wales Sydney, Australia 2003
- Shamdani A. H. Shamekhi A. H. Ziabasharhagh M. Aghanajafi C. “Modeling and Simulation of a Diesel Engine Common Rail Injector in Matlab/Simulink” 14th Annual International Conference of Mechanical Engineering Isfahan, Iran May 2006
- Roberson J. Crowe C. “Engineering fluid mechanics” Sixth John Wiley & sons, Inc. 1997
- Kiijarvi J. “diesel Fuel Injection System simulation” Publications of the Internal Combustion Engines Laboratory Helsinki University of Technology 77 126 951-22-6657-1 1459-5931 2003
- Wijetunge R.S. Brace C. J. Hawley J. G. Vaughan N. D. “Fuzzy Logic Control of Diesel Engine Turbocharging and Exhaust Gas recirculation” University of Bath UK 2000
- Pedrycz W. “Fuzzy Control and Fuzzy systems” Research Studies Press Ltd 1989
- Wang L. “A Course in Fuzzy systems and Control” Printice Hall Publications August 1996
- Shamekhi A.H. “Simulation and Fuzzy Spark Advance Control in SI engines by Ion Current Sensing” Department of Mechanical Engineering, K. N. Toosi University of Technology September 2004
- Yang M. Sorenson S.C. “Modeling of the Dynamic Processes in an Electronic Diesel Injection System” SAE, 920240 1992