What is the role of the carbon canister system in an engine?

[StJoseph]

The role of the carbon canister system in an engine is to introduce vapors into the combustion process and prevent them from evaporating into the atmosphere. The carbon canister contains activated carbon, which has adsorption capabilities. When the vehicle is running or turned off, gasoline vapors from the fuel tank enter the upper part of the activated carbon canister through the pipeline, while fresh air enters from the lower part of the activated carbon canister. When the engine is off, the gasoline vapors mix with fresh air inside the canister and are stored in the activated carbon canister. When the engine is started, the electromagnetic valve of the fuel evaporation purification device, installed between the activated carbon canister and the intake manifold, opens, allowing the gasoline vapors in the activated carbon canister to be drawn into the intake manifold to participate in combustion.