Because activated carbon has adsorption function, when the car is running or stalling, the gasoline vapor of the fuel tank enters the upper part of the activated carbon canister through the pipeline, and the fresh air enters the activated carbon canister from the lower part of the activated carbon canister.
After the engine is shut off, the gasoline vapor and the fresh air are mixed in the tank and stored in the activated carbon tank. When the engine is started, the electromagnetic valve of the fuel evaporating and purifying device installed between the activated carbon tank and the intake manifold is opened, Gasoline vapor is drawn into the intake manifold for combustion.
Gasoline is a volatile fuel, and the fuel in the fuel tank quickly volatilizes and increases the pressure inside the fuel tank. When the pressure reaches a certain value, it creates a certain risk. Therefore, people try to balance the pressure, at first the fuel tank cap is made Pressure limiting valve, when the pressure is higher than a certain value, the pressure limiting valve is opened, the petrol steam dispatched to the atmosphere, and later, people from the perspective of saving fuel and protecting the environment, set the canister, canister inside by Adsorption of strong activated carbon filled, fuel tank excess fuel is no longer discharged into the atmosphere, but there is a tube into the activated carbon cans. Activated carbon is adsorbed fuel vapor, when the car starts, the activated carbon canister solenoid valve opened in a timely manner, the fuel vapor absorbed back into the intake manifold, in order to achieve the purpose of saving fuel and environmental protection.
