Airbag apparatus for vehicle

1. An airbag apparatus for a vehicle, the airbag apparatus comprising:

an inflator provided outside a vehicle body, and configured to generate working gas;

a housing mounted to an edge of the vehicle body;

a cushion part accommodated in the housing, the cushion part configured to be inflated and discharged from the housing by receiving the working gas generated from the inflator, and structured to cover a front of the vehicle body;

a tether part provided outside of the cushion part to determine a deployment shape of the cushion part, wherein the tether part includes a first tether and a second tether configured such that first ends thereof are fixed to the housing and second ends thereof are fixed to an end portion of the cushion part, and a length of the first tether is configured to be shorter than a length of the second tether; and

a tether cutter configured to selectively cut the first tether,

wherein the cushion part is interrupted by the first tether or the second tether depending on operation of the tether cutter, which is selectively determined by a type of collision, and the deployment shape of the cushion part is determined.

2. The airbag apparatus of claim 1 , wherein the cushion part is provided therein with a deployment guide device configured to guide the deployment shape of the cushion part by guiding a flow of the working gas provided from the inflator.

3. The airbag apparatus of claim 2 , wherein the deployment guide device includes:

a diffuser communicating with the inflator to branch and supply the working gas into the cushion part; and

a first diaphragm and a second diaphragm dividing an internal space of the cushion part into multiple chambers,

wherein the first diaphragm and the second diaphragm are provided with multiple flow holes to communicate adjacent chambers with each other.

4. The airbag apparatus of claim 3 , wherein the diffuser branches the working gas in a vertical direction;

the internal space of the cushion part is divided into the multiple chambers in the vertical direction by the first diaphragm and the second diaphragm, and the multiple chambers are configured such that volumes of internal spaces thereof are gradually decreased from lower to upper directions; and

the working gas branching and being supplied from the diffuser is supplied in such a manner that a lowermost chamber of the multiple chambers is supplied with the working gas more than remaining chambers.

5. The airbag apparatus of claim 1 , wherein each of the inflator, the housing, the cushion part, and the tether part is configured as at least one pair that is arranged symmetrically with each other on opposite sides of a front edge or a rear edge of the vehicle body.

6. The airbag apparatus of claim 1 , wherein the vehicle body is a vehicle body of an autonomous vehicle.

7. An airbag apparatus for a vehicle, the airbag apparatus comprising:

an inflator provided outside a vehicle body, and configured to generate working gas;

a housing mounted to an edge of the vehicle body;

a cushion part accommodated in the housing, the cushion part configured to be inflated and discharged from the housing by receiving the working gas generated from the inflator, and structured to cover a front of the vehicle body; and

a tether part provided outside of the cushion part to determine a deployment shape of the cushion part,

wherein each of the inflator, the housing, the cushion part, and the tether part is provided at a roof edge of the vehicle body such that the cushion part is deployed from top towards bottom at front, back, and opposite sides of the vehicle body.