Studies on the influence of diesel engine operating parameters on the properties of emitted soot particles

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The further development of diesel engines influences combustion-generated soot particles with respect to their number, size, morphology and chemical composition. Recent studies suggest that the changed properties of emitted soot particles may increase hazards for human health and for the environment. The majority of previous research is aimed at the understanding of the in-cylinder soot formation process, the reduction of in-cylinder soot particles, the exhaust aftertreatment and, in the field of biosciences, the impact of different soot particles on human health and the environment.In the first two years of this project analyses of mixture formation and combustion were linked to the physicochemical properties of the emitted soot particles for a selection of stationary engine parameters which are particularly relevant for combustion and soot formation.The results of the project show that engine parameters, e.g. boost and injection pressure, have significant influence on the physicochemical properties of emitted soot particles at stationary operating points. By connecting analyses of mixture formation, combustion and emitted soot particles, sources for changes in physicochemical properties of the emitted soot particles can be identified.In the continuation of this project the research of stationary engine operating points shall be extended to transient engine operating conditions. Recent studies show that at transient engine operating conditions, typical for real traffic scenarios, soot emission is clearly different compared to stationary operating points.