The role of the car canister solenoid valve, the working principle of the canister solenoid valve

The activated carbon canister of a car is usually connected between the fuel tank and the intake manifold of the engine, and is controlled by the canister solenoid valve. Different models of the canister solenoid valve look different, but their functions are the same. Do you know what is the function of the solenoid valve of the car canister?

The canister solenoid valve is a device installed in a car to reduce air pollution caused by fuel evaporative emissions and increase fuel efficiency at the same time. When the car is started, the solenoid valve is opened to release the adsorbed fuel vapor to the intake pipe and enter the engine for combustion. The carbon canister is the most critical device in this system. It is responsible for collecting and storing gasoline vapor. The carbon canister mounted on the car is actually an assembly. Its shell is generally made of plastic and filled with activated carbon particles that can absorb steam. , The top is equipped with a cleaning control valve to control the amount of gasoline vapor and air entering the intake manifold, and a filter to purify gasoline vapor.

The working principle of the carbon canister solenoid valve: due to the tightness of the fuel tank, fuel consumption will cause negative pressure inside the fuel tank. Under the action of negative pressure, gasoline will volatilize oil vapor more easily than under normal pressure. When the engine is turned off, the canister mixes the oil vapor from the fuel tank with air and stores it in the activated carbon micropores in the canister to prevent the oil vapor from escaping into the atmosphere. When the engine starts, the electromagnetic valve installed between the activated carbon canister and the intake manifold is opened, and the oil vapor in the canister is used as fuel to be sent to the engine to participate in combustion. It not only reduces emissions, but also reduces fuel consumption.

Although the canister solenoid valve is small, it plays a very important role. If it fails, it will affect the operation of the car. If the solenoid valve is always closed, the gasoline vapor in the canister will accumulate more and more, and eventually overflow, causing waste and polluting the environment.If the solenoid valve is always in the open state, the air-fuel mixture in the engine intake port will always be in the enriched state, and at the same time the engine control unitYuanSince the solenoid valve of the carbon canister has not been controlled at this time, the instruction to reduce the fuel injection volume will not be issued. This will cause the engine to stall when the mixture is too thick when the car is hot, and it is difficult to start after the hot car is stalled.