NOVELTY - The device (11) has an air intake conduit (13) subjected to an aerodynamic air flow produced by displacement of a vehicle. A wind generator (12) transforms kinetic energy of incoming air flow (15) into the conduit into an electric energy, where the air flow passes into the conduit via an inlet in front of vehicle. The generator has a driving part mounted in the conduit and operated by the incoming air flow, where the conduit has a constant section. A movable closing unit (20) e.g. pivoting valve, closes the air intake conduit, and a control unit controls opening and closing of theclosing unit.    USE - Energy recover device for use in a vehicle (claimed) i.e. motor vehicle such as car (from drawings).    ADVANTAGE - The movable closing unit is positioned so as to close the air intake conduit during the rolling phase at constant or increasing speed such as acceleration phase, for stopping degradation of air penetration coefficient of vehicle, thus preventing the device to increase resistance to forward movement of vehicle during the rolling phase and optimizing an output of the energy recover device, and hence preventing the device to disturb total aerodynamics of the vehicle. The air intake conduit has a constant section for reducing encumbrance of the engine. The movable closing unit is positioned to prevent closing of the air intake conduit in the position when the vehicle rolls at decreasing speed in a decreasing phase, so that the valve is opened to cause air intake at the level of intake conduit and production of electricity by the wind generator, as soon as the speed of the vehicle decreases, without harming energy consumption of the vehicle since increase of air penetration coefficient of vehicle during the deceleration phase favors deceleration without additional consumption, thus optimizing recovery of energy. The device reduces overall consumption of vehicle and reduces emissions of carbon dioxide into air.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a vehicle comprising an energy recovery device    (2) a method of recovering energy.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an energy recover device.    Energy recover device (11)    Wind generator (12)    Air intake conduit (13)    Incoming air flow (15)    Movable closing unit (20)