Steam recovery method and system for fuel oil system, and vehicle

Abstract

The invention provides a steam recovery method and system for a fuel oil system, and a vehicle. According to the overall scheme, when filling of vehicle fuel oil is conducted, oil steam generated in the fuel oil system is adsorbed through a carbon canister; under the non-oiling working condition, if the interior of a fuel oil tank is in a positive pressure state, the oil steam is subjected to oil-gas separation through an oil-gas separation device; if the interior of the oil tank is in a negative pressure state, the fuel oil tank adsorbs fresh air through the carbon canister, and meanwhile thefresh air also desorbs the fuel oil steam adsorbed in the carbon canister. According to the steam recovery method and system for the fuel oil system, and the vehicle, a high-pressure fuel oil tank isnot adopted to reduce emission of the fuel oil steam, and only a common fuel oil tank is adopted so that the development difficulty of the fuel oil tank can be reduced, the development cost is reduced, and the development period is shortened; the pressure of the fuel oil system is low, therefore, the influences of micropores of the fuel oil system on fuel oil evaporation and emission can be reduced, and meanwhile the influences of airtightness and the temperature on the evaporation and emission of the fuel oil system are also reduced; and in addition, the carbon canister conducts desorbing without an engine, and thus engine matching work can be reduced.

Description

technical field [0001] The invention relates to a fuel system, in particular to a scheme for recovering fuel vapor. Background technique [0002] Existing gasoline vehicle fuel systems all have fuel vapor recovery schemes. The main scheme is to absorb the fuel vapor generated in the fuel tank through the carbon tank, and desorb the fuel vapor in the carbon tank through the negative pressure generated by the engine. The current vapor recovery scheme is widely used in ordinary gasoline vehicles and can meet the requirements of emission regulations. [0003] For plug-in hybrid PHEV gasoline vehicles, due to the short start-up time of the engine, the fuel vapor cannot be effectively recovered. Usually, the steam recovery solution is to use a high-pressure fuel tank. Under normal circumstances, the fuel tank is sealed, and the fuel vapor generated is not discharged outside. When refueling, or when the pressure in the fuel tank exceeds the set pressure, the fuel vapor is discha...

AI Technical Summary

Problems solved by technology

However, the high-pressure resistant fuel tank has high cost and strict requirements on the sealing of the fuel system. Excessively high ambient temperature will exceed the pressure-resistant range of the fuel tank, resulting in the leakage of fuel vapor.

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