Handling of fuel vapour

A method for handling fuel vapour in a fuel tank of a vehicle, wherein a fuel vapour cooling arrangement is connected to the fuel tank and arranged outside of the fuel tank, wherein the method comprises:

• receiving, from the fuel tank, fuel vapour in the fuel vapour cooling arrangement that is evaporated from fuel that is present inside of the fuel tank, the evaporated fuel remains as fuel vapor until received by the fuel vapour cooling arrangement,
• condensing the fuel vapour to liquid fuel in the fuel vapour cooling arrangement by cooling the fuel vapour in the fuel vapour cooling arrangement and increasing an amount of cooling of the fuel vapour either by increasing a pressure of a cooling medium in the fuel vapour cooling arrangement or by pressurizing the fuel vapour, the cooling is implemented at least in part by a vapour-compression refrigeration system comprising the cooling medium,
• controlling opening and closing of a first valve arranged between the fuel tank and the fuel vapour cooling arrangement that controls flow of fuel vapour from the fuel tank to the fuel vapour cooling arrangement, and
• controlling opening and closing of a second valve being a three-way valve arranged between an outlet of the fuel vapour cooling arrangement, the fuel tank, and an internal combustion engine of the vehicle, wherein the second valve is controlled to selectively route liquid fuel to either of the fuel tank or the internal combustion engine depending on a fuel requirement of the internal combustion engine.

A system for handling fuel vapour in a vehicle, wherein the system comprises:

• a fuel tank,
• a fuel vapour cooling arrangement connected to the fuel tank, arranged to receive fuel vapour that is evaporated from fuel that is present inside of the fuel tank, in which the evaporated fuel remains fuel vapour until it is condensed into liquid fuel within the fuel vapour cooling arrangement, wherein the fuel vapour cooling arrangement is arranged outside of the fuel tank,
• a valve is arranged between the fuel tank and the fuel vapour cooling arrangement to control the opening and closing of a fuel vapour cooling arrangement connection between the fuel tank and the fuel vapour cooling arrangement, and
• a valve arrangement connected to an outlet of the fuel vapour cooling arrangement to selectively return the liquid fuel back to the fuel tank or to purge the liquid fuel to the internal combustion engine, the liquid fuel purged to the internal combustion engine when there is an increased demand for fuel by the internal combustion engine,
• wherein the system is configured to condense the evaporated fuel by cooling the fuel vapour in the fuel vapour cooling arrangement, the cooling is implemented at least in part by a vapour-compression refrigeration system, and
• wherein increasing an amount of cooling of the fuel vapour comprises increasing a pressure of the fuel vapour.