This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Investigation of the Gas Exchange (Scavenging) on a Single-Scroll Turbocharged Four Cylinder GDI Engine
Technical Paper
2016-01-1024
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
For scavenging the combustion chamber during the gas exchange, a temporary positive pressure gradient between the intake and the exhaust is required. On a single-scroll turbocharged four cylinder engine, the positive pressure gradient is not realized by the spatial separation of the exhaust manifold (twin-scroll), but by the use of suitable short exhaust valve opening times. In order to avoid any influence of the following firing cylinder onto the ongoing scavenging process, the valve opening time has to be shorter than 180 °CA. Such a short valve opening time has both, a strong influence on the gas exchange at the low-end torque and at the maximum engine power. This paper analyzes a phenomenon, which occurs due to short exhaust valve opening durations and late valve timings: A repeated compression of the burned cylinder charge after the bottom dead center, referred to as “recompression” in this paper. By means of a new energetic analysis (available technical work capacity) the energetic contribution of the recompression to the boost pressure generation has been examined and is presented in this paper. Furthermore two different variable exhaust valve train systems in combination with a part-scroll-separation exhaust manifold are compared in this paper. The aim is to reduce fuel consumption at the nominal power. The two exhaust valve train systems increase the valve opening duration by either a two step system or by a system with the ability to offset the valve timing. It is shown in simulation results how both systems in combination with a prolonged part-scroll-separation in the exhaust manifold reach a potential to reduce fuel consumption up to 10 %.
Recommended Content
Authors
Topic
Citation
Wolany, A., Glahn, C., Berner, H., and Bargende, M., "Investigation of the Gas Exchange (Scavenging) on a Single-Scroll Turbocharged Four Cylinder GDI Engine," SAE Technical Paper 2016-01-1024, 2016, https://doi.org/10.4271/2016-01-1024.Also In
References
- Wünsche A. Untersuchung des Durchström- und Wirkungsgradverhaltens teilbeaufschlagter Abgasturbinen und des Einflusses dieser Randbedingungen auf das Betriebsverhalten abgasturboaufgeladener Verbrennungsmotoren Abschlussbericht FVVForschungsvorhaben 157 1976
- Schmid A. , Grill M. , Berner H.-J. und Bargende M. Transiente Ladungswechselsimulation mit Scavenging beim abgasturboaufgeladenen BDE-Ottomotor Ladungswechsel im Verbrennungsmotor Stuttgart 2010
- Gamma Technologies GT-SUITE Flow Theory Manual Version 7.1 Westmont, IL 60559 USA Gamma Technologies 2010
- Grill M. Objektorientierte Prozessrechnung von Verbrennungsmotoren Universität Stuttgart Dissertation 2006
- Grill , M. , Billinger , T. , and Bargende , M. Quasi-Dimensional Modeling of Spark Ignition Engine Combustion with Variable Valve Train SAE Technical Paper 2006-01-1107 2006 10.4271/2006-01-1107
- Grill M. Zylindermodul FVV-Vorhaben 869 Frankfurt Abschlussbericht 2008
- Schmid A. , Grill M. , Berner H.-J. und Bargende M. Ein neuer Ansatz zur Vorhersage des ottomotorischen Klopfens Ottomotorisches Klopfen Berlin 2010
- Schmid A. Virtuelle Entwicklung und Optimierung von Ottomotoren durch 0D/1D-Simulation Universität Stuttgart Dissertation 2012
- Groff E. , Königstein A. und D. H Der neue 2,0L Hochleistungs-Turbomotor mit Benzindirekteinspritzung von GM Powertrain 27. Internationales Wiener Motorensymposium 2006 Vienna 2006
- Pischinger R. Thermodynamik der Verbrennungskraftmaschine Vienna Springer 3 Aufl. 2009
- Pucher H. und Zinner K. Aufladung von Verbrennungsmotoren: Grundlagen, Berechnungen, Ausführungen Berlin Springer 4 Aufl. 2012
- Wieske P. , Lüddecke B. , Ewert S. , Elsäßer A. , Hoffmann H. und Rückauf J. Neue Konzepte zur Optimierung des transienten Drehmomentaufbaus und zur Verbrauchsoptimierung von aufgeladenen Ottomotoren 18. Aachener Kolloquium Fahrzeug- und Motorentechnik Aachen 2009
- Basshuysen R. Handbuch Verbrennungsmotor: Grundlagen, Komponenten, Systeme, Perspektiven Wiesbaden Springer Vieweg 7 Aufl. 2014
- Wolany A. Untersuchungen zur impulsgetrennten Aufladung an einem Vierzylinder-Ottomotor Universität Stuttgart Dissertation 2015