A vehicle fuel supply and evaporation system

Abstract

The invention discloses a vehicle fuel supply and evaporation system, which comprises a fuel tank, a fuel pump assembly, a fuel filter, a refueling pipe, a refueling vent pipe and a carbon tank; the fuel tank is connected to the carbon tank through the evaporation pipeline, and the carbon tank is output through the The tank adsorption pipe is connected to the engine. There is a one-way valve on the evaporation pipeline connecting the fuel tank and the carbon tank. The one-way valve makes the direction from the carbon tank to the fuel tank straight through, and the direction from the fuel tank to the carbon tank is conducted at a set pressure. Fuel pressure when the lower end of the filler pipe is filled with fuel. The invention can prevent fuel oil from being added after gun jumping, and can avoid problems such as easy failure of the carbon tank caused by liquid fuel in the fuel tank flowing into the carbon tank, easy volatilization of fuel vapor into the atmosphere, and the like. The invention has low cost, few changes to the original pipeline structure, and is convenient for refitting in the aftermarket.

Description

technical field [0001] The invention relates to an automobile fuel system, specifically a vehicle fuel supply and evaporation system controlled by a valve system, which is used to prevent excessive fuel filling or liquid fuel in the fuel tank from flowing into the carbon tank through the evaporation pipeline and cause the carbon tank to fail, belonging to the automobile fuel oil system. Supply and fuel evaporation technology field. Background technique [0002] Due to the possibility of fuel evaporation, in order to prevent the fuel in the fuel tank from evaporating into the atmosphere and polluting the air, a carbon canister is installed in the fuel system of the vehicle. The carbon canister is equipped with activated carbon. The carbon canister is connected to the fuel tank through a pipeline, so that the fuel tank produces The steam can enter the carbon tank through the pipeline and be absorbed by the activated carbon. A carbon canister adsorption pipe is arranged betwee...

AI Technical Summary

Problems solved by technology

If you continue to refill after jumping the gun, the fuel in the fuel tank will be too full, and there will be insufficient space for the volatilization of oil and gas, and even the liquid fuel will directly flow back into the carbon tank, resulting in the failure of the carbon tank, posing a great safety hazard

[0006] 2. The fuel tank is directly connected to the carbon tank through the fuel evaporation pipeline. When the vehicle is not used for a long time or exposed to the sun for a long time, the fuel vapor in the fuel tank will quickly cause the activated carbon in the carbon tank to absorb and saturate until it fails (the engine will not work if the car is not used for a long time. It cannot absorb the fuel vapor from the carbon tank into the engine for combustion)

If the user fails to replace the carbon tank in time, it may also cause liquid fuel to overflow from the carbon tank to the engine room, causing serious safety hazards

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