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Air Fuel Ratio Behavior of Spark Ignition Engine At Transient Condition
Published October 04, 1994 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
Poor driveability, for example "hesitation", is caused by a too lean or too rich air-fuel ratio. The air-fuel ratio changes based on the amount of liquid fuel in the intake port. A measuring technique for this liquid fuel was developed and observed, showing that optimized injector direction minimizes the liquid fuel amount and hence improves vehicle driveability. The optimized injector direction also minimizes the effect of gasoline volatility on the liquid fuel amount, and good driveability can be achieved for the wide range of gasoline T50.