A kind of desorption system and vehicle for orvr vehicle

Abstract

The invention relates to a desorption system and vehicle for ORVR vehicles, comprising a desorption pipe, a carbon tank, a throttling device and a fuel tank, the desorption pipe is connected between the engine and the carbon tank, and the carbon The canister communicates with the outside air through the air vent provided on itself, and the carbon canister is also connected to the filling and exhaust valve through the filling and exhausting passage through the fuel tank interface provided on itself. The air valve communicates with the inside of the fuel tank to form a desorption passage, and the throttling device is connected between the fuel tank interface and the filling and exhaust passage, and is connected to the desorption branch through a desorption branch. The attached pipe is connected and used for throttling the gas from inside the fuel tank during desorption. Compared with the prior art, the present invention has a structure that provides a desorption throttling device for the ORVR vehicle, so that the gas from inside the fuel tank can be throttled when desorption is realized, and no back pressure is generated when refueling, reducing the cost. low merit.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a desorption system and a vehicle for ORVR vehicles. Background technique [0002] Due to the volatile characteristics of gasoline, methanol and other fuels, a large amount of fuel vapor will be generated during fuel filling and daily storage, which will easily cause air pollution if not controlled. At present, cars are generally equipped with a fuel vapor emission control system, which includes a carbon canister. The inside of the canister is filled with activated carbon with strong adsorption to absorb fuel vapor. When the car engine is running, the engine intake manifold is connected The carbon canister desorbs the fuel vapor absorbed by the canister through negative pressure, and enters the intake manifold to participate in combustion. The activated carbon is cleaned to absorb the new fuel vapor in the fuel tank again, so as to save fuel and protect the environment. [0...

AI Technical Summary

Problems solved by technology

[0004] In view of the above desorption process, since the back pressure of the channel connecting the carbon tank to the fuel tank is small, when the back pressure of the air flowing through the activated carbon is large, it is easy to cause a large flow of gas required for desorption to be sucked from the fuel tank, and less The gas flow cleans the activated carbon, and there is a risk that the fuel tank will be sucked and the carbon tank will be insufficiently cleaned, resulting in a decrease in working capacity, which will further cause problems such as fuel tank rupture and steam overflow.

[0005] In the prior art, for example, the patent application with the application number CN202010468334.7 discloses a method and system for diagnosing desorption of a vehicle carbon canister. Then check whether the desorption pipeline is faulty to improve the accuracy of desorption pipeline failure detection, but this solution does not solve the problem that the desorption flow caused by the vehicle equipped with the ORVR device mainly flows through the inside of the fuel tank, causing the fuel tank to collapse. The problem of insufficient cleaning of the carbon tank

Another example is the patent with the application number CN202020160782.6, which discloses a fuel system protection valve and an automobile. Through the structural design of the protection valve, the pressure balance between the fuel tank and the carbon tank can be maintained; positive pressure expansion and negative pressure suction collapse of the fuel tank can be avoided. However, this solution has a pressure-preserving setting on the exhaust path, which is suitable for non-ORVR models. At the same time, the fuel tank and the carbon canister are connected during desorption. It cannot be avoided that the desorption flow mainly flows through the interior of the fuel tank, causing the carbon canister The problem of insufficient cleaning

[0006] The above cases did not solve the problem that the desorption flow caused by the vehicle equipped with the ORVR device mainly flows through the inside of the fuel tank, resulting in the collapse of the fuel tank and insufficient cleaning of the carbon tank. There are potential risks such as fuel tank rupture and fuel vapor overflow.

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