Fuel vapor control method and device

Abstract

The present application discloses a fuel vapor control method and device, wherein the fuel vapor control method includes: acquiring the current fuel tank pressure and canister load of the vehicle; judging whether the fuel tank pressure exceeds a first preset threshold and whether the canister load exceeds a second preset threshold A threshold is set; when the fuel tank pressure exceeds the first preset threshold or the carbon tank load exceeds the second preset threshold, the valve on the exhaust pipeline of the carbon tank is opened to flush the carbon tank. The fuel vapor control method and device disclosed in the present application can avoid the overflow of fuel vapor caused by the adsorption overload of the carbon canister.

Description

technical field [0001] The present application relates to the technical field of vehicles, in particular to a fuel vapor control method and device. Background technique [0002] Due to the volatile nature of gasoline, traditional fuel vehicles will generate a large amount of fuel vapor during use. If fuel vapor is discharged into the atmosphere, it will cause air pollution. Therefore, it is necessary to install a fuel vapor control system on the car to control the evaporation of pollutants. emission. [0003] In the related art, a carbon canister filled with active carbon is generally installed between the fuel tank and the engine of the fuel vehicle to absorb fuel vapor. When the engine is turned off, fuel vapor and fresh air are mixed in the canister and stored in the canister. The exhaust pipe of the canister is connected with the intake manifold of the engine. When the engine is started, the exhaust pipe of the canister is set The valve on the road is opened, and the f...

AI Technical Summary

Problems solved by technology

[0004] However, for hybrid vehicles, most of the time the car uses electric drive mode, which will cause the engine to not run for a long time. Although the fuel vapor generated by the fuel tank can also be adsorbed by the carbon canister, the adsorption of the carbon canister The capacity is limited. When the adsorption is overloaded, the fuel vapor will overflow to the atmosphere and cause pollution. At the same time, it may invade the passenger compartment, resulting in a decrease in passenger comfort.

If a special fuel tank or fuel system with enhanced pressure resistance is used on a hybrid vehicle, the vehicle manufacturer needs to pay a huge cost for it

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