before the canister is typically mounted fuel tank and the engine. Since fuel is a volatile liquid at room temperature are often filled the fuel tank vapor, action of the fuel evaporative emission control system the vapor is introduced into the combustion into the atmosphere and to prevent evaporation. This process plays an important role in the storage means is a charcoal canister.
Since the activated carbon adsorption function, or turn off when the vehicle is running, the fuel tank gasoline vapor through line charcoal canister into the upper part, the lower part of the fresh air from the tank into the activated carbon canister.
After the engine stall, gasoline vapor tank mixed with the fresh air and stored in the carbon canister, after the engine starts, fuel is mounted between the charcoal canister and the intake manifold purification apparatus evaporated the electromagnetic valve is opened, the activated carbon tank gasoline vapor drawn into the intake manifold to participate in combustion.
Gasoline is a volatile fuel, the fuel in the tank will evaporate quickly increasing the pressure inside the tank when the pressure reaches a certain value it will produce a certain risk, so people can find ways equilibrium pressure initially the fuel lid made of a pressure limiting valve, when the pressure is higher than a certain value, the pressure limiting valve is open, the gasoline vapor sent to the atmosphere, then, angles for fuel economy and environmental protection point of view, provided the carbon cans, filled inside the canister strong adsorption of activated carbon, excess fuel vapor in the fuel tank is no longer vented to the atmosphere, but rather the introduction of a tube charcoal canister. Is activated carbon adsorption of fuel vapor, automobile when actuated, timely charcoal canister solenoid valve is opened, the fuel vapor absorbed again poured into the intake manifold, in order to save fuel and environmental protection.