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The 20-cylinder MTU Series 8000 engine is distinguished in particular by a common rail fuel injection system, an electronic engine management system and a sequential turbocharging system. A gasdynamic model has been developed for this engine that facilitates simulation of both stationary operation modes and transient propulsion maneuvers. This analytical tool was employed extensively during the engine development phase in order to identify the complex interaction between the thermodynamic systems and to define the design peripheral conditions as well as for parameter optimization. The model was verified on the basis of experimental investigations. Using this basis, parameter variations and design concepts were modeled and their influences on the torque development, speed curve and engine-internal combustion sequences were discussed.

In this paper optical investigations of a gasoline direct injection engine with narrow spacing arrangement of spark plug and injector are presented. For the combustion analysis spectroscopy techniques based on the fiber technique are used. With this measurement technique information about soot formation and temperature progression in the combustion chamber is obtained. Furthermore a validation of numerical simulation of the stratified combustion with data obtained experimentally, is performed and discussed.

In this paper an estimation of efficiency potential of the engine process with Gasoline Direct Injection (GDI) is presented as well as both the advantages and todays problems of different mixture preparation concepts for the GDI engine. Furthermore examples of combustion analysis with optical measurement methods like Particle Image-Velocimetry (PIV) and spectroscopy techniques, which are important for future development steps in GDI, are shown and discussed. A validation of the numerical simulation of the stratified combustion process with data, obtained experimentally from a GDI engine, is performed and discussed. Consequently the combination of experimental and numerical methods provides both a better understanding of mixture preparation and combustion processes in GDI engines as well as an efficient development procedure for an optimized mixing and combustion process for future GDI engines.