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From current point of view future emission legislations for heavy-duty engines as well as industrial engines will require complex engine internal measures in combination with sophisticated aftertreatment systems as well as according control strategies to reach the emission targets. With EU VI, JP 09/NLT and US10 for heavy-duty engines as well as future Tier4 final or stage IV emission legislation for industrial applications, EGR + DPF + SCR probably will be combined for most applications and therefore quite similar technological approaches will be followed up in Europe as well as in the US and in Japan. Most “emerging markets” all over the world follow up the European, US or Japanese emission legislation with a certain time delay. Therefore similar technologies need to be introduced in these markets in the future. On the other hand specific market boundary conditions and requirements have to be considered for the development of tailored system concepts in these markets.

A light extinction technique has been applied to the direct injection Diesel combustion process under simplified engine-like boundary conditions in a model combustion chamber. The combination of these experimental tools proved to provide excellent data about the time and space resolved soot formation and oxidation processes in Diesel sprays. The importance of the injection history with regard to low soot emissions is pointed out by time and local resolved soot mass concentrations, the behaviour of total mass of soot in the spray and mean soot formation/oxidation rates for different injection rates, nozzle opening pressures and nozzle geometries.