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Reducing Fuel Consumption, Noxious Emissions and Radiated Noise by Selection of the Optimal Control Strategy of a Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 11, 2011 by SAE International in United States
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Despite the recent efforts devoted to develop alternative technologies, it is likely that the internal combustion engine will remain the dominant propulsion system for the next 30 years and beyond. Also as a consequence of more and more stringent emissions regulations established in the main industrialized countries, strongly demanded are methods and technologies able to enhance the internal combustion engines performance in terms of both efficiency and environmental impact.
Present work focuses on the development of a numerical method for the optimization of the control strategy of a diesel engine equipped with a high pressure injection system, a variable geometry turbocharger and an EGR circuit. A preliminary experimental analysis is presented to characterize the considered six-cylinder engine under various speeds, loads and EGR ratios. The fuel injection system is separately tested on a dedicated test bench, to determine the instantaneous fuel injection rate for different injection strategies. The collected data are employed for tuning proper numerical models, able to reproduce the engine behavior in terms of performances (in-cylinder pressure, boost pressure, air-flow rate, fuel consumption), noxious emissions (soot, NO) and radiated noise. In particular, a 1D tool is developed with the aim of characterizing the flow in the intake and exhaust systems and predicting the engine-turbocharger matching conditions, by including a short-route EGR circuit; a 3D model (AVL Fire™) is assessed to reproduce into detail the in-cylinder thermo-fluid dynamic processes, including mixture formation, combustion, and main pollutants production; an in-house routine, also validated against available data, is finally developed for the prediction of the combustion noise, starting from in-cylinder pressure cycles. Obviously, data exchange between the codes is previewed.
The overall numerical procedure is firstly checked with reference to the experimentally analyzed operating points. The 1D, 3D and combustion noise models are then coupled to an external optimizer (ModeFRONTIER™) in order to select the optimal combination of the engine control parameters to improve the engine performance and to contemporary minimize noise, emissions and fuel consumption. Under the hypothesis of a pilot-main injection strategy, a multi-objective optimization problem is solved through the employment of a genetic algorithm. Eight degrees of freedom are defined, namely start of injection, dwell time, energizing time of pilot and main pulses, EGR valve opening, throttle valve opening, swirl level, and turbine opening ratio. It is shown that non-negligible improvements can be gained, also depending on the importance given to the various objectives.
CitationSiano, D., Bozza, F., and Costa, M., "Reducing Fuel Consumption, Noxious Emissions and Radiated Noise by Selection of the Optimal Control Strategy of a Diesel Engine," SAE Technical Paper 2011-24-0019, 2011, https://doi.org/10.4271/2011-24-0019.
- Bression, G. Soleri, D. Savy, S. Dehoux, S. et al. “A Study of Methods to Lower HC and CO Emissions in Diesel HCCI,” SAE Int. J. Fuels Lubr. 1 1 37 49 2009 10.4271/2008-01-0034
- Martínez-Martínez, S. Sánchez-Cruz, F.A. Riesco-Ávila, J.M. Gallegos-Muñoz, A. Aceves, S.M. “Liquid penetration length in direct diesel fuel injection” Applied Thermal Engineering 28 1756 1762 2008
- Yun, H. Sellnau, M. Milovanovic, N. Zuelch, S. “Development of Premixed Low-Temperature Diesel Combustion in a HSDI Diesel Engine,” SAE Technical Paper 2008-01-0639 2008 10.4271/2008-01-0639
- Bozza, F. Torella, E. “The Employment of a 1D Simulation Model for the A/F Ratio Control in a VVT Engine,” SAE Transactions - Journal of Engines 3 2003 10.4271/2003-01-0027
- AVL Fire v2008 Users Guide - ICE Physics & Chemistry
- Liu, A., A. Mather, D. Reitz, R. “Modeling the Effects of Drop Drag and Breakup on Fuel Sprays,” SAE Technical Paper 930072 1993 10.4271/930072
- O’Rourke, P. J. “Statistical Properties and Numerical Implementation of a Model for Droplet Dispersion in Turbulent Gas” J. Comput. Physics 83 1989
- Dukowicz, J.K. “A particle-fluid numerical model for liquid sprays,” J. Comp. Physics 35 229 253 1980
- Costa, M. Siano, D. Allocca, L. Montanaro, A. et al. “Light Duty Diesel Engine: Optimization of Performances, Noxious Emission and Radiated Noise,” SAE Int. J. Engines 2 2 740 748 2010
- Mauss, F. Balthasar, M. “Simplification of a Detailed Kinetic Soot Model for Application in 3-D Programs” Samuelson, S. Combustion Technologies for a Clean Environment, book series: Energy, Combustion and the Environment 4 1997
- Torregrosa, A.J. Broatch, A. Martin, J. Monelletta, L. “Combustion noise level assessment in direct injection Diesel engines by means of in-cylinder pressure components” Measurement Science Technology 18 2131 2142 2007
- Payri, F. Broatch, A. Tormos, B. Marant, V. “New methodology for in cylinder pressure analysis in direct injection diesel engines-application to combustion noise” Measurement Science Technology 16 540 547 2005
- Sasaki, D. 2005 “ARMOGA, An efficient Multi-Objective Genetic Algorithm” Technical Report January 2005
- Bozza, F. De Bellis, V. “Steady and Unsteady Modeling of Turbocharger Compressors for Automotive Engines,” SAE Technical Paper 2010-01-1536 2010 10.4271/2010-01-1536