Abstract
This study was made of the transient fuel supply characteristicis in an intake system of a carburetted SI engine under transient driving conditions, through both theoretical analysis and experimental work. The results show that an increase in air velocity is not always accompanied with an increase in liquid fuel film velocity. The thickness of the liquid fuel film increases with the delay of time up to a certain value. The increasing ratio of liquid film flow rate grows with the rise of the acceleration rate finally approaching a certain value. The rapid acceleration of the engine causes an accumulation of liquid fuel film in the intake manifold, and consequently, an insufficient supply of fuel into the combustion chamber. The air fuel ratio in the combustion chamber increases with the time delay, and reaches a maximum which is out of the combustible range of the mixture immediately after the beginning of acceleration.
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