A desorption control device, a carbon canister assembly, and a fuel system having the same

Abstract

The invention discloses a desorption control device, a carbon tank assembly and a fuel system having the same. The desorption control device includes: a connecting piece, on which an adsorption hole, an air intake hole and a desorption hole are arranged; a moving part assembly; and an elastic device, which applies an elastic bias force to the moving part assembly, so that the moving part When the assembly is in the open position and there is desorption suction negative pressure at the desorption hole, the desorption suction negative pressure exerts a suction force on the moving member assembly, thereby overcoming the elastic biasing force of the elastic device , driving the moving element assembly to a sealing position to seal the adsorption hole. The desorption control device of the present invention uses the negative pressure during desorption to control the on-off of the adsorption hole, so that the adsorption branch can be blocked during desorption, and the fuel tank will not be sucked by the negative pressure generated by the suction. , and at the same time, the flushing gas entering the carbon canister for desorption can be fresh air, so as to improve the desorption performance of the canister.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a desorption control device, a carbon canister assembly and a fuel system having the same. Background technique [0002] About 20% of the total hydrocarbon emissions of gasoline vehicles come from the evaporative emissions of the fuel supply system. In order to meet the requirements of emission regulations, existing gasoline vehicles generally adopt a fuel evaporative emission control system with a carbon canister as the main component. In the fuel evaporative emission control system of the prior art, when the carbon canister is desorbed, the gas for flushing the carbon powder is sucked from the two branches of the carbon canister adsorption port and the air vent. The fresh air from the gas port branch is beneficial to the desorption of the carbon canister, while the gas from the adsorption port branch is the oil-air mixture from the fuel tank. When the oil-gas mixture is d...

AI Technical Summary

Problems solved by technology

When the oil-gas mixture is desorbed by the carbon canister, it will cause adsorption loading and affect the desorption quality

At the same time, if excessive suction is drawn from the branch of the adsorption port, the fuel tank may be deformed due to negative pressure, that is, the fuel tank is sucked and deflated.

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