Carbon tank desorption mechanism for motor vehicle

Abstract

The invention discloses a carbon tank desorption mechanism for a motor vehicle. The carbon tank desorption mechanism comprises a carbon tank, an air filter and an engine supercharger mounted in the motor vehicle, and a Venturi tube, wherein the air filter is connected with an air inlet pipe and an air outlet pipe; the engine supercharger is provided with an air inlet end and an air outlet end; theVenturi tube comprises a shell; the shell comprises an air inlet pipe segment, a desorption pipe segment and an exhaust pipe segment; the air inlet pipe segment of the Venturi tube is connected withthe air outlet end of the engine supercharger; the exhaust pipe segment of the Venturi tube is connected with the air outlet pipe of the air filter; the desorption pipe segment of the Venturi tube isconnected with the carbon tank. The carbon tank desorption mechanism has lower negative influence on an engine, and has a better desorption effect. The Venturi tube is made by one-time injection molding, so that the sealing performance is much more greatly enhanced than before, the defective rate is greatly reduced, and the overall cost of the product is lowered.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to the carbon canister desorption technology in a fuel evaporation system. Background technique [0002] In the stage of the National VI standard, the air containing gasoline volatilization generated during the refueling process must be completely absorbed by the carbon tank and cannot escape through the refueling port. In order to ensure that the carbon canister can continuously absorb the volatile gasoline vapor in the fuel tank, it is necessary to desorb the carbon canister under driving or idling conditions, so as to ensure that the carbon canister has sufficient adsorption capacity to absorb the volatile gasoline vapor in the fuel tank. [0003] The naturally aspirated engine can desorb the carbon canister through the connection pipeline through the negative pressure generated in the intake manifold. But for a supercharged engine, the intake manifold is under positive pres...

AI Technical Summary

Problems solved by technology

[0004] 1. The structure is relatively complex, the whole is divided into two parts for two injection molding processes, and then the two parts are welded together

The overall sealing performance after welding is difficult to control, and the defective rate is difficult to reduce, resulting in high product cost

[0005] 2. The flow rate of the engine supercharger into the Venturi tube is relatively large, which has a large negative impact on the engine; at the same time, the gas flow attracted by the carbon tank is small, and the desorption effect is poor

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