What does the carbon canister solenoid valve do? What does it have to do with the throttle? (Chang 'an minibus)

The electromagnetic valve of carbon canister is a device installed on the car, which is used to reduce air pollution caused by fuel evaporation and improve fuel efficiency. When the car is started, the electromagnetic valve is opened, and the adsorbed fuel vapor is released into the intake pipe and enters the engine for combustion. Carbon canister is the most critical device in this system, which is responsible for collecting and storing gasoline vapor. The carbon canister installed on the vehicle is actually a component. Its shell is generally made of plastic, filled with activated carbon particles that can absorb steam, and the top is equipped with a clean control valve to control the amount of gasoline vapor and air entering the intake manifold and a filter screen to purify gasoline vapor.