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International Conference on Ignition Systems for Gasoline Engines – International Conference on Knocking in Gasoline Engines
For decades, scientists and engineers have been working to increase the efficiency of internal combustion engines. For spark-ignition engines, two technical questions in particular are always in focus: 1. How can the air/fuel mixture be optimally ignited under all possible conditions? 2. How can undesirable but recurrent early and self-ignitions in the air/fuel mixture be avoided? Against the background of the considerable efficiency increases currently being sought in the context of developments and the introduction of new fuels, such as hydrogen, methanol, ammonia and other hydrogen derivatives as well as biofuels, these questions are more in the focus than ever. In order to provide a perfect exchange platform for the community of combustion process and system developers from research and development, IAV has organized this combined conference, chaired by Marc Sens. The proceedings presented here represent the collection of all the topics presented at the event and are thus intended to serve as an inspiration and pool of ideas for all interested parties.
A Simulative Approach to Predict Energy Consumption of Future Powertrain Configurations for the Year 2040
This book deals with the simulative prediction of efficiency and CO2-emissions of future powertrain systems for the year 2040. For this purpose, a suitable simulation environment is first created. This is followed by a technology extrapolation of all relevant powertrain systems, for example: combustion engines, electric drives, fuel cells as well as all relevant additional components. These components are then used to build 57 vehicle variants for the simulation. Finally, extensive simulations of the vehicle variants are carried out, evaluated and compared. Comprehensive tables of results are available for all simulated vehicle variants. The evaluations are of interest to anyone concerned with energy consumption and CO2-emissions of future vehicles.
Knocking in Gasoline Engines
The book includes the papers presented at the conference discussing approaches to prevent or reliably control knocking and other irregular combustion events. The majority of today’s highly efficient gasoline engines utilize downsizing. High mean pressures produce increased knocking, which frequently results in a reduction in the compression ratio at high specific powers. Beyond this, the phenomenon of pre-ignition has been linked to the rise in specific power in gasoline engines for many years. Charge-diluted concepts with high compression cause extreme knocking, potentially leading to catastrophic failure. The introduction of RDE legislation this year will further grow the requirements for combustion process development, as residual gas scavenging and enrichment to improve the knock limit will be legally restricted despite no relaxation of the need to reach the main center of heat release as early as possible. New solutions in thermodynamics and control engineering are urgently needed to further increase the efficiency of gasoline engines.
Potential of Water Injection for Gasoline Engines by Means of a 3D-CFD Virtual Test Bench
Water injection is one of the most promising technologies to improve the engine combustion efficiency, by mitigating knock occurrences and controlling exhaust gas temperature before turbine. As result, the engine can operate at stoichiometric conditions over the whole engine map, even during the more power-demanding RDE cycles. Antonino Vacca presents a methodology to study and optimize the effect of water injection for gasoline engines by investigating different engine layouts and injection strategies through the set-up of a 3D-CFD virtual test bench. He investigates indirect and direct water injection strategies to increase the engine knock limit and to reduce exhaust gas temperature for several operating points.
2024 Stuttgart International Symposium on Automotive and Engine Technology
In einer sich rasant verändernden Welt sieht sich die Automobilindustrie fast täglich mit neuen Herausforderungen konfrontiert: Der problematischer werdende Ruf des Dieselmotors, verunsicherte Verbraucher durch die in der Berichterstattung vermischte Thematik der Stickoxid- und Feinstaubemissionen, zunehmende Konkurrenz bei Elektroantrieben durch neue Wettbewerber, die immer schwieriger werdende öffentlichkeitswirksame Darstellung, dass ein großer Unterschied zwischen Prototypen, Kleinserien und einer wirklichen Großserienproduktion besteht. Dazu kommen noch die Fragen, wann die mit viel finanziellem Einsatz entwickelten alternativen Antriebsformen tatsächlich einen Return of Invest er...
Proceedings of the 2nd Conference on Engine Processes
As the combustion engine looks set to remain the dominant energy conversion unit in vehicle powertrains in the medium term, either in combination with electrical components or on its own, attention will need to be paid to continue improving its efficiency in the future. The high development depth of today's combustion engines means that it is becoming increasingly difficult to achieve significant efficiency improvements by simple means. On the search for these improvements, the focus has shifted to inner-engine processes, for instance charge cycles including the charging system, the mixture formation including injection, combustion and kinematic conversion of the energy within the fuel. Our ...
6th International Conference on Ignition Systems for SI Engines – 7th International Conference on Knocking in SI Engines
In addition to the indisputably necessary electrification of the transport sector, which is currently being ramped up, internal combustion engines will still be urgently needed in the future. Otherwise, the demand for mobility in the on-road, off-road and non-road sectors cannot be met. There is no doubt that these internal combustion engines will have to be improved regarding efficiency plus lower emissions and nowadays more and more important upgraded for zero and low carbon fuels. Even though Spark Ignition (SI) engines have been around for more than a century, there is still a lot of room for improvement, particularly in terms of power density, ignition, combustion control, and preventing uncontrolled combustion. To offer all interested developers an inspiring exchange platform for the latest developments, IAV established two exciting conferences more than two decades ago, which are now held under the heading "Two Conferences - One Goal". This volume brings together the contributions to this conference.
Flottendatenbasierte physikalische Routenenergiebedarfsprognose
Um auf die Klimaziele mit energetisch planenden Funktionen in Elektrofahrzeugen hinzuarbeiten, ist entlang geplanter Strecken eine präzise Energiebedarfsprognose unabdingbar, welche relevante Einflüsse separat quantifiziert. Diese Arbeit zeigt dazu eine neue Fahrprofilprognose, welche die Energieflüsse beim Fahren und Rekuperieren auf beliebigen Streckenabschnitten mit nur 5 Parametern erfasst. Anwendung findet das Modell in einer Reichweitenprognose sowie einer zeitlichen Routenoptimierung. - To work towards climate goals with energetic planning functions in electric vehicles, a precise energy demand forecast along planned routes is essential, which separately quantifies relevant influences. For that this work shows a new driving profile prediction, which models energy flows while driving and recuperating on any link of a route with just 5 parameters. This work shows example applications of the model range forecasting and temporal route optimization.
Experimentelle Analyse des Einflusses der Düsen- und Betriebsparameter auf die Eigenschaften von Dieseleinspritzstrahlen
Corina Slocinski identifiziert vorliegend Möglichkeiten zur Beeinflussung der Eigenschaften von Dieselkraftstoffstrahlen und bewertet deren Wirkung in der Gemischaufbereitung. Anhand hydraulischer, mechanischer und optischer Analysen sowie der Bewertung mittels eines Einzylindermotors leitet die Autorin für die Strahlformung infolge der elektrischen Einspritzstrategie ein bedeutendes Potenzial für die Brennverfahrensoptimierung ab. Neben der Definition von Standards zur Erhöhung der Aussagekraft und Vergleichbarkeit der Ergebnisse entwickelt und etabliert sie neue Methodiken zur optischen Analyse von Einspritzstrahlen.
