Seat bottom mounted airbag

1. A restraint system comprising:

a seat defining a cross-seat axis, the seat including a seat bottom and a seatback supported by the seat bottom;

an airbag mounted to the seat bottom and being inflatable upwardly from the seat bottom to an inflated position;

the airbag, in the inflated position, including a panel spaced from the seatback and two extensions each extending from the panel to the seatback, the extensions being spaced from each other along the cross-seat axis; and

a processor and a memory storing instructions to control inflation of the airbag based on detecting a pet in a seating area of the seat.

2. The restraint system of claim 1 , wherein the seat bottom includes a front end spaced from the seatback, the airbag is disposed at the front end of the seat bottom in an uninflated position.

3. The restraint system of claim 2 , wherein the panel is disposed at the front end of the seat bottom in the inflated position.

4. The restraint system of claim 1 , wherein the panel includes a top spaced from the seat bottom in the inflated position, each extension extends from the seat bottom towards the top.

5. The restraint system of claim 4 , wherein the airbag includes an upper extension disposed between the extensions and the top of the panel, the upper extension extending from the panel towards the seatback in the inflated position.

6. The restraint system of claim 5 , wherein the upper extension extends from one extension to the other extension.

7. The restraint system of claim 1 , wherein the airbag includes an upper extension spaced from the seat bottom in the inflated position, the upper extension extends towards the seatback in the inflated position.

8. The restraint system of claim 7 , wherein the upper extension extends from one extension to the other extension.

9. The restraint system of claim 1 , further comprising a plurality of external tethers extending from the seatback to the airbag, the plurality of external tethers are attached to the seatback and the airbag.

10. The restraint system of claim 9 , further comprising a pretensioner supported by the seatback, the pretensioner is engaged with each of the plurality of external tethers.

11. The restraint system of claim 10 , further comprising a plurality of supports mounted to the seatback, wherein each external tether is wrapped partially around one respective support when the airbag is in an uninflated position.

12. The restraint system of claim 10 , further comprising a plurality of supports mounted to the seatback, wherein each external tether is moveably engaged with one respective support.

13. The restraint system of claim 9 , wherein the plurality of external tethers are outboard of the airbag relative to the seat.

14. The restraint system of claim 9 , wherein the plurality of external tethers are uninflatable.

15. The restraint system of claim 1 , wherein the seat defines a seating area, the extensions extend along the seating area in the inflated position.

16. The restraint system of claim 1 , further comprising a processor and a memory storing instructions to prevent inflation of the airbag based on detecting a human occupant in a seating area of the seat.

17. The restraint system of claim 1 , wherein the panel includes two sides spaced from each other along the cross-seat axis, each extension is disposed at one respective side.

18. The restraint system of claim 1 , wherein the seat bottom extends from the seatback in a seat-forward direction, the panel is spaced from the seatback in the seat-forward direction.

19. A restraint system comprising:

a seat defining a cross-seat axis, the seat including a seat bottom and a seatback supported by the seat bottom;

an airbag mounted to the seat bottom and being inflatable upwardly from the seat bottom to an inflated position;

the airbag, in the inflated position, including a panel spaced from the seatback and two extensions each extending from the panel to the seatback, the extensions being spaced from each other along the cross-seat axis; and

a processor and a memory storing instructions to prevent inflation of the airbag based on detecting a human occupant in a seating area of the seat.

20. A restraint system comprising:

a seat defining a cross-seat axis, the seat including a seat bottom and a seatback supported by the seat bottom;

an airbag mounted to the seat bottom and being inflatable upwardly from the seat bottom to an inflated position;

the airbag, in the inflated position, including a panel spaced from the seatback and two extensions each extending from the panel to the seatback, the extensions being spaced from each other along the cross-seat axis;

a plurality of external tethers extending from the seatback to the airbag, the plurality of external tethers being attached to the seatback and the airbag;

a pretensioner supported by the seatback, the pretensioner being engaged with each of the plurality of external tethers; and

a plurality of supports mounted to the seatback, wherein each external tether is moveably engaged with one respective support.