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The engine management system of the new Mercedes-Benz S-class has been completely redesigned and fully meets the demands of the new top models. The ignition management, fuel injection management and air management system components are interlinked by a high-speed serial databus, controlling functions are performed in real-time and parallel. Open system architecture and a suitable communication structure indicate how engine management systems will be designed in the future.

The improvement of DI diesel engines for passenger cars to fulfil pollutant emission limits and lower fuel consumption and noise is closely linked to continued development of the injection system. Today's injection systems demonstrate varying potential in terms of the flexibility of injection parameters for improving mixture formation and combustion. DaimlerChrysler evaluated the potential of different injection systems, looking particularly at the distributor pump, unit injection system and Common Rail system. Based on the results of these investigations, the Common Rail system was selected. The tests presented in this paper were performed on a single-cylinder engine with Common Rail system. They focused on increased rail pressure in combination with different nozzle geometries. The results show significant benefits in NOx/smoke trade off at part load conditions with high EGR rate.