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Study of Ethanol Blending Effects on Formation of Mixture Under Cold Start Conditions
Published October 07, 2009 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
In this study, cold startability of E85 was researched with a focus on the vaporization characteristics. Cold startability was tested with E85 of which Reid Vapor Pressure (RVP) is equivalent to gasoline. The engine failed to start when the E85 was used. The vaporization simulation was conducted on the fuels. As a result, it was revealed that E85 vaporization is lower than gasoline even if RVP are the same. To enhance the fuel vaporization, increase of injection quantity and usage of a high RVP fuel were effective. To keep the same engine startability as the gasoline, need about 3 to 6 times fuel injection or 30-50 kPa higher RVP would be needed.