The fuel injection process in the port of a firing 4-valve SI engine at part load and 25°C head temperature was observed by a high speed video camera. Fuel was injected when the valve was closed. The reverse blow-down flow when the intake valve opens has been identified as an important factor in the mixture preparation process because it not only alters the thermal environment of the intake port, but also strip-atomizes the liquid film at the vicinity of the intake valve and carries the droplets away from the engine. In a series of “fuel-on” experiments, the fuel injected in the current cycle was observed to influence the fuel delivery to the engine in the subsequent cycles.
Visualization of Mixture Preparation in a Port-Fuel Injection Engine During Engine Warm-up
Sae Technical Papers
1995 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1995
1995-10-01
Conference paper
English
Mixture Preparation in a SI Engine with Port Fuel Injection During Starting and Warm-Up
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