High voltage battery unit for vehicle and underbody of vehicle

1. An active air curtain apparatus of a vehicle, comprising:

a duct formed with a suction port, a discharge port, and an air flow path from the suction port to the discharge port and mounted to the inner surface of a bumper of the vehicle; and

a flap having a plate shape operated by being supported and guided by the duct and configured to open and close the discharge port.

2. The active air curtain apparatus of claim 1 , wherein the flap is formed with a gear part, and further includes:

a drive gear engaged with the gear part to be driven; and

a step motor configured to operate the drive gear.

3. The active air curtain apparatus of claim 2 , wherein the gear part includes:

a first protrusion end formed to extend in a direction perpendicular to the longitudinal direction of the flap; and

a second protrusion end spaced apart from the first protrusion end and formed to extend in a direction perpendicular to the longitudinal direction of the flap,

wherein the first protrusion end and the second protrusion end are formed with a first inner gear and a second inner gear, respectively.

4. The active air curtain apparatus of claim 3 , wherein the drive gear includes:

a first gear engaged with the first inner gear; and

a second gear engaged with the second inner gear and the first gear.

5. The active air curtain apparatus of claim 1 , wherein the duct includes a flap guide part formed at the discharge port side and configured to support and guide the flap.

6. The active air curtain apparatus of claim 5 , wherein the flap guide part includes:

a flap guide end having a shape that protrudes in a direction inclined to the direction of the air flow path and extends in a direction parallel to the longitudinal direction of the discharge port; and

a flap guide aperture formed along the longitudinal direction of the flap guide end.

7. The active air curtain apparatus of claim 2 , wherein the flap opens or closes the discharge port based on the rotation direction of the step motor.

8. An active air curtain system including a pair of active air curtain apparatuses of claim 1 , wherein the pair of active air curtain apparatuses are mounted at the left side of the bumper and the right side of the bumper with respect to the front of the vehicle, respectively.

9. The active air curtain system of claim 8 , wherein when the vehicle turns to the left, the discharge port of the active air curtain apparatus mounted to the left side of the bumper is closed, and when the vehicle turns to the right, the discharge port of the active air curtain apparatus mounted to the right side of the bumper is closed.

10. A method of operating a pair of active air curtain apparatuses, each which includes: a duct formed with a suction port, a discharge port, and an air flow path from the suction port to the discharge port and mounted to the inner surface of a bumper of a vehicle; and a flap having a plate shape operated by being supported and guided by the duct and configured to open and close the discharge port, the method comprising:

determining by a controller, whether the vehicle turns; and

operating, by the controller, the pair of active air curtain apparatuses based on whether the vehicle turns and to which direction the vehicle turns,

wherein the pair of active air curtain apparatuses are mounted to the left side of the bumper and the right side of the bumper with respect to the front of the vehicle, respectively.

11. The method of claim 10 , wherein when the vehicle turns to the left, the flap of the active air curtain apparatus mounted to the left side of the bumper is adjusted to operate in a direction in which the discharge port is closed.

12. The method of claim 11 , further comprising:

determining, by the controller, that the vehicle turns to the left when a steering angle of the vehicle is less than about −3° with respect to 0°.

13. The method of claim 10 , wherein when the vehicle turns to the right, the flap of the active air curtain apparatus mounted to the right side of the bumper is adjusted to operate in a direction in which the discharge port is closed.

14. The method of claim 13 , further comprising:

determining, by the controller, that the vehicle turns to the right when a steering angle of the vehicle is greater than +3° with respect to 0°.

15. The method of claim 11 , further comprising:

comparing, by the controller, a vehicle speed with a reference vehicle speed prior to determining whether the vehicle turns.

16. The method of claim 15 , further comprising:

when the vehicle speed is greater than the reference vehicle speed, determining, by the controller, whether the vehicle turns; and

in response to determining that the vehicle speed is less than the reference vehicle speed, maintaining the flap of the pair of active air curtain apparatuses in a state of opening the discharge port.

17. The method of claim 13 , further comprising:

in response to determining that the vehicle speed is greater than the reference vehicle speed, determining, by the controller, whether the vehicle turns; and

in response to determining that the vehicle speed is less than the reference vehicle speed, maintaining the flap of the pair of active air curtain apparatuses in a state of opening the discharge port.

18. The method of claim 17 , further comprising:

in response to determining that the vehicle speed is greater than the reference vehicle speed, determining, by the controller, whether the vehicle turns; and

in response to determining that the vehicle speed is less than the reference vehicle speed, maintaining the flap of the pair of active air curtain apparatuses in a state of opening the discharge port.