A bonnet for a vehicle and a control unit. The bonnet includes a front edge and a rear edge. A recessed longitudinal channel is formed in the bonnet and extends from the front edge towards the rear edge. An airflow modification device is disposed transversely across the longitudinal channel for controlling airflow over the bonnet, wherein the airflow modification device and the recessed channel form a conduit, the conduit having a cross-sectional area which is diverging as the conduit extends towards the rear edge and/or a movable element may be provided to change the cross-sectional area.

An air flow management device for a vehicle includes a support and at least one deflector wall supported by an actuating system mounted on the support and configured to move the deflector wall along a predefined trajectory relative to the support between a retracted position and a deployed position. The deflector wall is mounted to rotate relative to the support about an axis of rotation so as to be able to retract in case of contact of the deflector wall with an obstacle.

A vehicle having one or more guide vanes for guiding airflow along a side of the vehicle. The guide vane(s) can be moved from a retracted position to a deployed position. The vehicle can include sills which can be displaced laterally outwardly and downwardly a retracted position to a deployed position.

An airflow adjusting apparatus to be provided in a vehicle includes a flap and an airflow generator. The vehicle includes a wheel disposed to be partly protruded downward from a vehicle body of the vehicle. The flap is protruded, in front of the wheel, downward from the vehicle body. The airflow generator is provided in an underneath of the vehicle body and vehicle-widthwise inwardly from the wheel. The airflow generator is configured to generate an airflow vehicle-widthwise inward, and backward of the vehicle. The airflow moves obliquely relative to a vehicle longitudinal direction when the vehicle travels forward.

An airflow adjusting apparatus to be provided in a vehicle includes an airflow ejector. The vehicle includes a wheel and a wheel housing including a cavity. The cavity is opened downward and laterally outward of a vehicle body of the vehicle, and houses a portion of the wheel. The airflow ejector is provided, in the cavity, on a front side of the vehicle relative to the wheel. The airflow ejector is configured to eject an airflow that forms a turbulence boundary layer adjacent to a surface of the wheel on a vehicle-widthwise inner side.

An air deflector assembly for a vehicle includes a vertically translatable air deflector and linear actuators actuated in series by a driver to vertically translate the air deflector. The air deflector includes one or more rails configured for sliding translation within one or more cooperating vehicle-mounted tracks. A controller is operatively connected to the driver, and may be configured to vertically translate the air deflector to a predetermined position according to a vehicle rate of travel. The driver selectively causes the linear actuators to raise or lower the air deflector.

An aerodynamic device suitable to be fastened under and to extend downwards from a vehicle, near the vehicle front face includes one central spoiler having a front wall and two side walls extending rearwards from the front wall side ends, and two lateral spoilers, each lateral spoiler having a front wall as well as an outer side wall and an inner side wall each extending rearwards from a front wall side end. In the operative position of the aerodynamic device, the inner side wall of each lateral spoiler substantially faces a corresponding side wall of the central spoiler and forms a channel having a substantially longitudinal axis and having a width along a transverse direction which decreases from its front end to its rear end, so that the channel is capable of canalizing and accelerating air flowing under the vehicle substantially longitudinally from the channel front end towards its rear end.

A motor vehicle comprising an aerodynamic underbody flap (1) rotating about a transverse axis (10) and a lower transverse structure (4) arranged at the rear of the lower part of a front bumper (6). The rear part of the lower transverse structure (4) comprises guide means (41, 42) which, in the event of a frontal impact, guide the backward movement of the lower transverse structure (4) such that the rear face of the lower transverse structure (4) comes into contact with the axis (10) of the aerodynamic underbody flap (1).

An actively controlled flap system includes a bar defining a rotational axis, a first flap rotatably coupled to the bar and configured to rotate about the rotational axis, and a second flap rotatably coupled to the bar and configured to rotate about the rotational axis, the second flap including an opening extending through the second flap. The first flap is rotatable between a first position in which the opening in the second flap is covered by the first flap and a second position in which the opening in the second flap is uncovered, and the second flap is rotatable between a third position and a fourth position.

An example vehicle includes a passenger compartment; a nose region forwards of the passenger compartment, the nose region having a top surface; and an airflow deflector positioned on the top surface of the nose region, the airflow deflector comprising a first panel projecting from the top surface of the nose region; and a second panel coupled to the first panel, the second panel being spaced from the first panel to form a channel between the first and second panels, the channel having an inlet facing towards the top surface of the nose region so that a rearwardly moving airflow incident on the first panel is directed towards the channel inlet and an outlet facing away from the top surface of the nose region so that air flowing through the outlet is directed in an upwards direction, the upwards airflow causing disruption to a rearward airflow moving towards the passenger compartment.