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114 Costin Dragomir et al. 5. Conclusions 1. The theoretical and experimental investigations results allow formulating the following conclusions: 2. SI engine supercharging is a method to obtain efficiency and specific power/torque performance increasing. 3. The pollutant emissions level decreases due to the improvement of the combustion processes. 4. Knock is the most important limiting factor of the supercharging engine. An optimum correlation establish between dosage, spark ignition advance, air boost pressure, air boost temperature, exhaust gas temperature, brake mean effective pressure, brake specific fuel consumption leads to the avoiding of knocking phenomena. 5. Supercharging represents an efficient method of engine downsizing and downspeeding. Acknowledgments. The authors would like to thank to AVL List GmbH Graz, Austria, for providing the possibility to use the Simulation Software AVL BOOST REFERENCES Attard W., Watson H.C., Konidaris S., Khan M.A., Comparing the Performance and Limitations of a Downsized Formula SAE Engine in Normally Aspirated, Supercharged and Turbocharged Modes. University of Melbourne, SAE Paper 2006-32-0072, in SAE International (2006). Attard W.A., Toulson E., Hamori F., Watson H.C., Combustion System Development and Analysis of a Downsized Highly Turbocharged PFI Small Engine. SAE Paper 2009-32-0185/20097185, in SAE Japan and SAE International (2009). Attard W.P., Konidaris S., Toulson E., Watson W.C., The Feasibility of Downsizing a 1.25 Liter Normally Aspirated Engine to a 0.43 Liter Highly Turbocharged Engine, University of Melbourne, SAE Paper 2007-24-0083, in SAE International (2007). Basshuysen R., Gasoline Engine with Direct Injection, Processes, Systems, Development, Potential. Vieweg+Teubener, GWV Fachverlage Gmbh, Wiesbaden, Germany, 2008. Basshuysen R., Ottomotor mit Direkteinspritzung, Verfahren, Systeme, Entwicklung, Potenzial. 2, Auflage. Vieweg+Teubener, GWV Fachverlage Gmbh, Weisbaden Germany, 2008. Becker N., Der Neue 1,0-L- Dreizilinder-MPI- Motor Für Den UP! .ATZ Extra September 2011, Germany, pp.36-43. Blaxill H., The Role Of IC Engines In Future Energy Use. MAHLE Powertrain, Germany, 2011. Eiser A., Deblaze M., Freidmann K., Kerschenlohr A., Schachner M.(2011), Der Antrieb, Der neue Audi Q3. ATZ Extra Juli 2011, Germany, pp. 24-31. Halder J., Dreizylindermotoren von Volkswagen. MTZ 05/2009, Germany, 2009, pp. 354- 360.
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 115 Heywood J.B., Symposium University of Madison, Wisconsin, Engine Research Center, 2005. Heywood J.B., Internal Combustion Engines Fundamentals, McGraw-Hill Book Company, 1988. Kirwan J.E., Mark Shost M., Roth G., Zizelman J., 3-Cylinder Turbocharged Gasoline Direct Injection: A High Value Solution for Low CO2 and NOx Emission,s SAE Paper 2010-01-0590, Publishe 04/12/2010, in SAE International (2010). Klauer N., Kretschmer J., Unger H., Der Antreb des BMW 535i Gran Turismo. ATZ 09/September 2009, Germany, 2009, pp. 610-617. Korte V., Hancock D., Blaxill H., Downsizing-Motor von Mahle als Technologiedemonstrator, konzept, Auslegung und Konstruktion, MTZ 01/2009, Germany, 2009, pp. 10 -19. Navrátil J., Polášek M., Vítek O., Macek J.,Baumruk P., Simulation of Supercharged and Turbocharged Small Spark-Ignition Engine. 3 th. International Colloquium MECCA, Czech, 2003, pp. 27-33. Pană C., Negurescu N., Popa M.G., Cernat A., Investigations Regarding the Use of the Turbocharging and Bioethanol at SI Engines. Bul. Inst. Polit. Iasi, LXI(LX), 4, s. Construcţii de maşini (2010). Pfalzgraf B., Fitzen M.,Siebler J., Erdmann H.-D., First ULEV Turbo Gasoline Engine- The Audi 1.8 l 125kW 5-Valve Turbo. SAE Paper 2001-01-1350, SAE International. Stephenson M., MAHLE Powertrain, Engine Downsizing - An Analysis Perspective. SIMULIA Conference, Germany, 2009. INVESTIGAŢII TEORETICE ŞI EXPERIMENTALE ALE MOTORULUI CU APRINDERE PRIN SCÂNTEIE SUPRAALIMENTAT (Rezumat) Supraalimentarea motoarelor cu aprindere prin scânteie este o metodă eficientă de mare actualitate pentru creşterea presiunii medii efective şi a puterii litrice a lor (conceptul downsizing) şi pentru reducerea emisiilor poluante. Metoda poate fi aplicată la motoarele cu aprindere prin scânteie cu un management eficient a funcţionării lor în vederea evitării apariţiei fenomenului de ardere cu detonaţie. Investigaţiile teoretice şi experimentale au fost efectuate pe un motor cu aprindere prin scânteie cu cilindreea de 1,5 l şi cu injecţie multipunct transformat dintrun motor de serie cu admisie normală. Lucrarea prezintă influenţe ale presiunii de supraalimentare asupra performanţelor motorului. În lucrare a fost stabilită o corelaţie optimă între dozaj, avans la declanşarea scânteii electrice, presiune de supraalimentare, temperatura gazelor de evacuare, presiune medie efectivă şi consum specific efectiv de combustibil pentru un control eficient al funcţionării motorului cu aprindere prin scânteie supraalimentat.
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