The emission ingredients can reflect the working condition of fuel supplying system and air supplying system, the mixing and burning condition in cylinder.
At low temperatures, mixture formation is poor due to the large fuel droplets concerned, and due to the inefficient mixing of the fuel with the air drawn in by the engine.
低温时，燃油黏度和密度增大，且发动机所吸入的空气无法与燃油充分混合，从而影响油气混和气的形成。
3
The function of air motion, which promotes fuelmixing with air, is great mainly after fuel spray impingement.