Kai Behnk

Externe Nacheinspritzung zur Regeneration von Dieselpartikelfiltern

Die Regeneration von Dieselpartikelfiltern im gesamten Kennfeldbereich stellt eine hohe Herausforderung an die Motorentwicklung dar. Insbesondere bei Anwendungen, bei denen aus Packagegrunden der Partikelfilter nicht motornah, sondern nur in Unterbodenposition angeordnet werden kann, lassen sich die zur Filterregeneration notwendigen hohen Temperaturen nur mit grosem Aufwand erreichen. Die hier vorgestellte Konzeptstudie der IAV GmbH zeigt das Potenzial einer externen Nacheinspritzung zur Darstellung einer sicheren Filterregeneration auch unter diesen erschwerten Einbaubedingungen.

Emissionsgeführtes Motormanagement für Nutzfahrzeuganwendungen

Die stetig steigenden Anforderungen in Emissionsvorgaben uber die gesamte Betriebsdauer moderner Nutzfahrzeug-Dieselmotoren verlangen neuartige Steuerungs- und Regelungskonzepte. Uber eine Emissionsregelung konnen vorrangig Bauteilalterungen, -streuungen oder Verunreinigungen kompensiert werden. Um den Anspruchen einer immer dynamischeren Entwicklung derartiger Konzepte in kurzerer Zeit gerecht zu werden, setzt die IAV GmbH die neue hochflexible und leistungsstarke Entwicklungsumgebung namens modularer Prototypen-Engine-Controller (MPEC) ein.

Measurement of 3-D In-Cylinder Flow Fields Using Doppler Global Velocimetry

In-cylinder charge motion plays a key role in optimizing the combustion process of modern reciprocating engines. The present paper describes a method for obtaining the volumetric, isothermal, in-cylinder velocity flow field using Doppler Global Velocimetry (DGV). The DGV system is designed for measuring time-averaged velocity data in three different light sheet directions using a single camera system with the aim of providing planar, spatially resolved, three-component velocity data of the cylindrical cross section. As DGV provides time-averaged data, the results can be directly compared with data obtained by 3-D CFD analysis. An automated program code generates characteristic numbers of the measured velocity fields with the aim of assessing and comparing the results of different engine concepts.

Emission-based engine manage ment for heavy-duty applications

GM Powertrain Europe and the Politecnico di Torino have experimentally assessed the potentialities in terms of fuel consumption reduction and the challenges in terms of pollutant emissions of micro-, mild- and strong-hybrid diesel applications for light-duty vehicles based on GM 1.9 l four-cylinder in-line diesel engine.

Use of external post-injection for regeneration of diesel particulate filters

The regeneration of diesel particulate filters over the entire map area is a great challenge for engine developers. Especially in applications where the particulate filter cannot be mounted under the bonnet for package reasons but only in an underfloor position, the high temperatures needed for filter regeneration can only be reached with major efforts. The concept study presented in this article was carried out by IAV GmbH and shows the potential of external post-injection for realising reliable filter regeneration, even under these adverse installation conditions.

Emission optimisation process for diesel engines on the dynamic engine test bench

Complying with tougher emission limits while maintaining or improving fuel consumption is a challenge currently facing diesel engine developers. This requires a greater system complexity of the diesel engine, and thus an optimised development process. This article describes the present status of the IAV GmbH emission optimisation process for diesel engines.

Emissionsoptimierungsprozess für Dieselmotoren am dynamischen Motorprüfstand

Scharfere Emissionsgrenzwerte unter Beibehaltung oder Verbesserung des Kraftstoffverbrauchs zu erfullen, stellt eine aktuelle Herausforderung an die Dieselmotorenentwicklung dar. Dies erfordert eine hohere Systemkomplexitat des Motors und damit eine Optimierung des Entwicklungsprozesses. Der vorliegende Beitrag beschreibt den derzeitigen Stand des Emissionsoptimierungsprozesses fur Dieselmotoren der IAV GmbH.

Development scenario for passenger-car diesel engines with optimised: Combustion processes to meet future emission standards

The main reason why the modern supercharged direct-injection diesel engine is so successful as a means of propelling passenger cars is because it is more efficient than spark-ignition engines in nearly every operating state. This is attributable to the different fuels and combustion systems. Diesel engines operating with “quality” control provide an excellent basis for future low-CO2 drive systems. However, ultra-low emission concepts with a diesel engine — compared with SI-engine SULEV vehicles already presented — can only be implemented through technology advances. This article by IAV GmbH gives an outlook on future developments.