Variable aerodynamic system for vehicle

A variable aerodynamic system for a vehicle, wherein a speed table including a normal mode, a fuel-efficient mode, and a driving mode divided in accordance with a speed of a vehicle is inputted in a controller, the normal mode, the fuel-efficient mode, and the driving mode being set to have a first range, a second range and a third range, respectively, and

• the system comprises an active air skirt and an active rear spoiler that are deployed by a controller in accordance with a reference value corresponding to a mode in which a current speed of the vehicle is included, after the controller receives information obtained by a detector and checks a mode in the speed table in the controller to which the speed of the vehicle corresponds, while the vehicle, in which a height from an end of a front bumper to a front wheel center is within a predetermined value, runs, wherein the controller has a first hysteresis period for stowing devices that have been deployed of the active skirt and the active rear spoiler at a speed lower than a speed when the second range was started, when the speed of the vehicle decreases from the second range inputted in the controller to the first range, wherein the controller has a second hysteresis period for stowing devices that have been deployed of the active air skirt and the active rear spoiler at a speed lower than a speed when the third range was started, when the speed of the vehicle decreases from the third range inputted in the controller to the second range.

A variable aerodynamic system for a vehicle comprising:

• a controller having access to a speed table including a normal mode, a fuel-efficient mode, and a driving mode, the normal mode, the fuel-efficient mode, and the driving mode being set to have a first range, a second range and a third range, respectively;
• an active air skirt;
• and
• an active rear spoiler, wherein, while the vehicle in operational, the controller is configured to deploy the active air skirt and the active rear spoiler in accordance with a reference value corresponding to the fuel-efficient mode when
• the controller receives information about the vehicle from a detector, and
• a speed of the vehicle corresponds to the fuel-efficient mode in the speed table, wherein a height from an end of a front bumper to a front wheel center is within a predetermined value,
• wherein the controller has a first hysteresis period for stowing devices that have been deployed of the active air skirt and the active rear spoiler at a speed lower than a speed when the second range was started, when the speed of the vehicle decreases from the second range inputted in the controller to the first range,
• wherein the controller has a second hysteresis period for stowing devices that have been deployed of the active air skirt and the active rear spoiler at a speed lower than a speed when the third range was started, when the speed of the vehicle decreases from the third range inputted in the controller to the second range.

A method of operating a vehicle comprising a variable aerodynamic system, the method comprising:

• detecting a speed of the vehicle;
• having access to a speed table comprising a plurality of operational modes including a normal mode, a fuel-efficient mode, and a driving mode, the normal mode, the fuel-efficient mode, and the driving mode being set to have a first range, a second range and a third range, respectively;
• based on the detected speed, selecting an operational mode of the plurality of operational modes;
• and
• deploying an active air skirt, an active rear spoiler, and/or an active rear bumper spoiler in accordance with a reference value corresponding to selected operational mode of the plurality of operational modes,
• wherein a controller in the vehicle has a first hysteresis period for stowing devices that have been deployed of the active air skirt, the active rear spoiler, and the active rear bumper spoiler at a speed lower than a speed when the second range was started, when the speed of the vehicle decreases from the second range inputted in the controller to the first range,
• wherein the controller has a second hysteresis period for stowing devices that have been deployed of the active air skirt, the active rear spoiler, and the active rear bumper spoiler at a speed lower than a speed when the third range was started, when the speed of the vehicle decreases from the third range inputted in the controller to the second range.