Methods and Analysis of Fuel Injection, Mixture Preparation and Charge Stratification in Different Direct Injected SI Engines 2001-01-0970
Direct gasoline injection is one major approach in reducing fuel consumption to fulfill the stages of CO2 reduction commitments in Europe from today until 2008. One effort is to unthrottle the gasoline engine during idle and partial load utilizing charge stratification. This may be realized by using different combustion concepts.
This paper shows the analysis of mixture preparation for three different types of direct injected gasoline engines. Each engine was driven with two injectors which have two different atomization concepts. The engine types draw a clear dividing line between their combustion concepts. The injectors were analyzed in a pressure chamber, in an optical engine, and in an actual 1-cylinder engine. The formation of wall-film in wall-guided combustion systems will be discussed. Several important injector and engine parameters for fuel direct injection are pointed out. The experimental tools used are the Laser-Induced Exciplex Fluorescence (LIEF), Schlieren and light scattering techniques, as well as shadowgraphy.
Citation: Ortmann, R., Arndt, S., Raimann, J., Grzeszik, R. et al., "Methods and Analysis of Fuel Injection, Mixture Preparation and Charge Stratification in Different Direct Injected SI Engines," SAE Technical Paper 2001-01-0970, 2001, https://doi.org/10.4271/2001-01-0970. Download Citation
Rainer Ortmann, Stefan Arndt, Jürgen Raimann, Roman Grzeszik, Gernot Würfel
Robert Bosch GmbH
SAE 2001 World Congress
Direct Injection SI Engine Technology 2001-SP-1584, SAE 2001 Transactions Journal of Engines-V110-3