Project Leader:	Professor Dr-Ing Horst Rulfs
Research Assistant:	Dipl-Ing K Ruschmeyer
Duration:	01.06.2005 - 31.05.2006

In the development of large four-stroke diesel engines higher mean effective pressures are limited, among others, also from the current limitations in the loading of the exhaust turbocharger. With the help of a two-stage charging it would be possible in the future to increase mean effective pressure significantly and thus also increase the peak cylinder pressures. This will enable development of very compact large diesel engines with favourable weights and low specific construction costs.

The one-cylinder test engine of the TUHH (D=265 mm, n=750 min^-1) was extensively adapted and equipped with an electronically-controlled injection and external supercharging, so that mean effective pressures of ca. 40 bar and peak cylinder pressures of ca. 360 could be obtained.

The necessary design of the combustion process and the engine charging were preliminary studied using modified simulation models aiming to determine the most promising matrix of engine operating conditions (charging, injection conditions, load changes etc.). The empirically developed simulation models for the process and the pollutants formation in the combustion chamber had to be adapted to the extreme operating conditions achieved here. These theoretical studies assisted then the fundamental designing of the injection system, the combustion chamber and the valve timing (among others for the Miller Process).