Potential and Challenges of Fuel Injection Pressure up to 50 MPa for Gasoline Direct Injection Engines

Autoren

Dr.-Ing. Felix Eitel, Dipl.-Ing. Jörg Schäfer, Dipl.-Ing. Elke Redante,
Dr. Roland Nolte, Dipl.-Ing. Achim Königstein,
Opel Automobile GmbH, Rüsselsheim;
Dr.-Ing. Christof Heeger,
Continental Automotive GmbH, Schwalbach

Zusammenfassung

The present work deals with the potential and challenges of an increase of injection pressure beyond 35 MPa up to 50 MPa. The focus of the study is the influence on fuel consumption, particulate emissions and the challenges of system integration.
The investigations were conducted by means of selected emission-relevant engine operating points, which comprise a large part of the characteristic map. In addition to the measurement of integral variables such as engine power output, fuel consumption and pollutant emissions, the use of optical diagnostics enables a
phenomenological view of the generation of particulates. The pressure increase shows a strong positive effect on PN emissions in almost all stationary operating points under test and a negligible influence on fuel consumption. However, the integration of the fuel system into current engine concepts requires further development work in the coming years.

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