Werner Sauter

High-Speed Visualisation of Combustion in Modern Gasoline Engines

Today research and development in the field of gasoline engines have to face a double challenge: on the one hand, fuel consumption has to be reduced, while on the other hand, ever more stringent emission standards have to be fulfilled. The development of engines with its complexity of in-cylinder processes requires modern development tools to exploit the full potential in order to reduce fuel consumption. Especially optical, non-intrusive measurement techniques will help to get a better understanding of the processes. With the presented high-speed visualisation system the electromagnetic radiation from combustion in the UV range is collected by an endoscope and transmitted to a visualisation system by 10, 000 optical fibres. The signal is projected to 1, 920 photomultipliers, which convert the optical into electric signals with a maximum temporal resolution of 200 kHz. This paper shows the systematic application of flame diagnostics in modern combustion systems. For this purpose, a single-cylinder SI engine has been modified for a spray guided combustion strategy as well as for HCCI. The characteristics of flame propagation in both combustion modes were recorded and correlated with thermodynamic analyses. In case of the spray guided GDI engine, high pressure fuel injection was applied and evaluated.

Effects of Mixture Quality on Controlled Auto-Ignition

Controlled auto-ignition in petrol engines is a promising concept for the reduction of exhaust emissions and fuel consumption. Experimental and numerical investigations have been carried out at the Institute for Reciprocating Engines (IFKM) and the Institute of Technical Thermodynamics (ITT) to investigate the implementation of this combustion process in passenger car engines.

Controlled auto-ignition — Reduction of engine emissions by controlled auto-ignition in gasoline engines

The controlled auto-ignition in gasoline engines is a promising concept to reduce both emissions and fuel consumption simultaneously. Within the FVV-Vorhaben „Benzinselbstzun dung“ experimental and numerical investigations have been carried out at the Institut fur Kolbenmaschinen (IFKM) and at the Institut fur Technische Thermodynamik (ITT) to estimate the realisation of this combustion process in passenger car engines.

Reduzierung der Motoremissionen durch kontrollierte Selbstzündung im Ottomotor

Die kontrollierte Selbstzundung im Ottomotor stellt eine interessante Moglichkeit zur Reduzierung der Stickoxidemissionen und zur Steigerung des Wirkungsgrads dar. Im Rahmen des FVV-Vorhabens „Benzinselbstzundung“ wurden am Institut fur Kolbenmaschinen (IFKM) und am Institut fur Technische Thermodynamik (ITT) der Universitat Karlsruhe experimentelle und numerische Grundlagenuntersuchungen im Hinblick auf die Umsetzbarkeit dieses Brennverfahrens in Pkw-Motoren durchgefuhrt.