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Analysis of Mixture Formation Process in a Stoichiometric Direct Injection Gasoline Engine
Published November 28, 2002 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
The stoichiometric direct injection gasoline engines have higher torque performance than the port injection engines, as the volumetric efficiency can be increased due to the cooling effects of charging air by the fuel evaporation in the cylinder. They need only 3-way catalyst, leading to the cost down. However there exists the injection timing (region) that increased volumetric efficiency does not lead to higher torque. In order to investigate the phenomena, the in-cylinder mixture formation process has been analyzed by the LIF and the CFD techniques. As the result, it has been revealed that the phenomena are caused by the inhomogeneous mixture distribution before the ignition timing.