Motorcycle fuel evaporative pollutant control system

Abstract

The invention relates to a motorcycle fuel evaporative pollutant control system comprising a carbon canister and a gasoline cut-off valve, an air inlet absorption port of the carbon canister is connected with an oil tank vent pipe by a fourth pipeline, the gasoline cut-off valve is arranged on a first pipeline, a pressure control valve of the carbon canister and an air outlet desorption port of the carbon canister are communicated with an air path of a carburetor, the pressure control valve and the desorption port of the carbon canister are respectively communicated with a three-way pipe by a second pipeline and the first pipeline, and the three-way pipe is communicated with the air path of the carburetor after being communicated with a third pipeline. The adoption of the technical proposal can not only reduce the emission of fuel evaporative pollutants, but also reduce the impacts of the fuel evaporative pollutants on the working condition emission, thereby leading the exhaust emission of motorcycles to achieve the requirement of being more environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of motor vehicle pollutant emission control, in particular to a fuel evaporation pollutant control system on motorcycles. Background technique [0002] Due to daytime air exchange and heat soak loss, the fuel system of motor vehicles will produce fuel evaporation pollutants, which are hydrocarbons and cannot be directly discharged into the atmosphere. In order to protect the environment and save energy, my country has formulated motorcycle fuel National standards for emission limits of evaporative pollutants. [0003] Existing motorcycles are equipped with a carbon canister in the fuel system to absorb fuel evaporation pollutants. The carbon canister is connected between the fuel tank and the air filter. The fuel evaporation pollutants discharged from the fuel tank enter the carbon canister for adsorption, and then enter the carburetor. The filter mixes with air to form a mixture that enters the engine for c...

AI Technical Summary

Problems solved by technology

In some existing structures, the desorption point is set on the intake manifold. Since the mixed gas in the gas from the canister may be very thin, after mixing with the mixed gas from the carburetor, the rich mixed gas will become thinner. In this way, after the mixed gas participates in the combustion, it will cause idling instability and affect the emission under working conditions. Generally speaking, the emission of CO under working conditions will increase. It is also found in the test that if the motorcycle selects the desorption point on the air filter, There may be insufficient negative pressure, which cannot guarantee the effective desorption of fuel vapor in the carbon tank

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