Vehicle seat cushion airbag, control system and control method thereof

1. A seat cushion airbag for a vehicle, comprising:

an airbag cushion formed with a center part installed in a center of or around a front part of a seat cushion of a vehicle and located between legs of a passenger when being deployed, and an extension part extended on both sides of the center part and located above the legs of the passenger;

an inflator connected to the airbag cushion and providing an expansion force to the airbag cushion; and

an external tether formed with a support part having a first end part connected to a rear end part of a seat cushion frame and extending toward a front end part of the seat cushion frame, and a branch part branched from a second end of the support part toward the extension part and connected to the extension part.

2. The seat cushion airbag according to claim 1 , wherein the inflator is connected to the center part to inject gas inside, and the center part communicates with the extension part, to deploy the extension part after deployment of the center part.

3. The seat cushion airbag according to claim 1 , further comprising:

a cushion housing accommodating the airbag cushion therein; and

a cushion bracket combining the cushion housing and the inflator with a front part of a seat frame in a state where the airbag cushion is accommodated in the cushion housing.

4. The seat cushion airbag according to claim 1 , further comprising an internal tether located inside the airbag cushion, and having a first end part connected to a frame of the seat cushion and a second end part connected to the extension part to support the airbag cushion.

5. The seat cushion airbag according to claim 4 , wherein the internal tether includes a first tether having a first end part connected to the frame of the seat cushion and extended along the center part, a second tether connected to a second end part of the first tether and formed in a link structure so as to be folded before being deployed and to be deployed toward the extension part when being deployed, and a third tether extended from both end parts of the second tether and connected to the extension part.

6. The seat cushion airbag according to claim 5 , wherein the first tether and the third tether are formed of a deformable fabric material, and the second tether is formed of a hard synthetic resin material.

7. The seat cushion airbag according to claim 1 , wherein the extension part includes a tether hole penetrated by the branch part, wherein the branch part penetrates the tether hole, and is connected to the extension part through connection of respective end parts thereof to the internal tether.

8. The seat cushion airbag according to claim 1 , further comprising a cushion housing accommodating the airbag cushion therein and combined with the seat cushion frame, wherein a lead hole is formed on the cushion housing to allow the external tether to pass through the lead hole.

9. The seat cushion airbag according to claim 1 , wherein the center part includes a projection part formed to project toward the passenger, wherein the projection part supports a forward movement of a pelvis portion of the passenger.

10. The seat cushion airbag according to claim 1 , wherein the extension part includes a vent hole formed thereon to exhaust a part of gas injected by the inflator.

11. A system for controlling a vehicle seat cushion airbag, comprising:

a seat cushion airbag, comprising;

an airbag cushion formed with a center part installed in a center of or around a front part of a seat cushion of a vehicle and located between legs of a passenger when being deployed, and an extension part extended on both sides of the center part and located above the legs of the passenger; and

an inflator connected to the airbag cushion and providing an expansion force to the airbag cushion;

a cushion detector connected to a pressure sensor provided on the seat cushion and calculating a pressure distribution pressurized onto the seat cushion; and

a controller configured to:

execute deployment of the airbag cushion through reception of an input of a vehicle collision signal based on the pressure distribution of the seat cushion calculated by the cushion detector; and

in response to the cushion detector calculating the pressure distribution toward a rear part of the seat cushion, operate the airbag cushion not to be deployed when the vehicle collision signal is input.

12. The system according to claim 11 , wherein in response to the cushion detector calculating the pressure distribution toward both sides of the front part of the seat cushion, the controller is configured to operate the airbag cushion to be deployed when the vehicle collision signal is input.

13. The system according to claim 11 , wherein in response to the cushion detector calculating the pressure distribution toward a center of the front part of the seat cushion, the controller is configured to operate the airbag cushion not to be deployed when the vehicle collision signal is input.

14. A method for controlling a vehicle seat cushion airbag control system of claim 11 , the method comprising:

detecting a cushion by calculating a pressure distribution pressurized onto a seat cushion;

determining a location of the pressure distribution detected at the cushion detecting; and

controlling deployment of the airbag cushion based on the location of the pressure distribution determined at the determining.

15. The method according to claim 14 , wherein the controlling includes operating the airbag cushion not to be deployed when the pressure distribution toward a rear part of the seat cushion is calculated at the cushion detecting.

16. The method according to claim 14 , wherein the controlling includes operating the airbag cushion to be deployed when the vehicle collision signal is input when the pressure distribution toward both sides of the front part of the seat cushion is calculated at the cushion detecting.

17. The method according to claim 14 , wherein the controlling includes operating the airbag cushion not to be deployed when the pressure distribution toward a center of the front part of the seat cushion is calculated at the cushion detecting.