Dual-chambered passenger airbag

1. An airbag comprising:

an outer shell defining an interior;

at least one vent opening structured to enable fluid communication between the interior and an exterior of the airbag;

a divider dividing the airbag interior into an upper chamber and a lower chamber separate from, and in fluid communication with, the upper chamber; and

a vent cover for covering said vent opening, said vent cover operatively coupled to the at least one vent opening and to the divider wherein said vent cover is opened based on a predetermined position of the divider.

2. The airbag of claim 1 wherein the lower chamber is structured to cushion the torso, but not the head, of a vehicle occupant.

3. The airbag of claim 1 further comprising an inter-chamber venting system operatively coupled to the divider, the venting system being structured to permit gas to flow unobstructed from the upper chamber through the divider into the lower chamber, the venting system being structured to restrict gas backflow from the lower chamber into the upper chamber.

4. The airbag of claim 3 wherein the venting system is structured to close so as to restrict backflow from the lower chamber into the upper chamber responsive to pressure exerted on the airbag by a torso of the occupant prior to contact between the airbag and a head of the occupant.

5. The airbag of claim 1 wherein the divider is structured to open the vent cover when a pressure in the lower chamber is greater than a pressure in the upper chamber.

6. The airbag of claim 1 further comprising a tether operatively connecting the divider to the vent cover such that deflection of the divider in a first direction acts to pulls the vent cover into a closed condition, thereby restricting flow of gas through the at least one vent opening.

7. The airbag of claim 6 wherein the tether operatively connects the divider to the vent cover such that deflection of the divider in a second direction enables the vent cover to open responsive to gas pressure within the upper chamber, so as to permit an unobstructed flow of gas through the at least one vent opening.

8. A vehicle occupant protection system comprising an airbag in accordance with claim 1 .

9. An airbag system comprising an airbag in accordance with claim 1 .

10. A vehicle including an airbag in accordance with claim 1 .

11. An airbag comprising:

an outer shell defining an interior;

at least one vent opening structured to enable fluid communication between the interior and an exterior of the airbag;

a divider dividing the airbag interior into a first chamber and a second chamber separate from, and in fluid communication with, the first chamber;

a vent cover closable over the at least one vent opening so as to restrict a flow of gas through the at least one vent opening, the vent cover also being openable so as to permit an unobstructed flow of gas through the at least one vent opening wherein said vent cover is opened based on a predetermined deflection of the divider;

and

a tether operatively connecting the vent cover to the divider such that the vent cover is closed when the divider is deflected toward the second chamber, and such that the vent cover is open when the divider is deflected toward the first chamber.

12. The airbag of claim 11 further comprising:

an inter-chamber venting system operatively coupled to the divider, the venting system being openable to permit gas to flow unobstructed from the first chamber through the divider into the second chamber, when a pressure in the first chamber is greater than a pressure in the second chamber, the venting system being closable to restrict gas backflow from the second chamber into the first-chamber when the pressure in the second chamber is greater than a pressure in the first chamber.

13. A vehicle occupant protection system comprising an airbag in accordance with claim 11 .

14. An airbag system comprising an airbag in accordance with claim 11 .

15. A vehicle including an airbag in accordance with claim 11 .

16. An airbag comprising:

an outer shell defining an interior;

a divider dividing the interior into an upper chamber and a lower chamber separate from, and in fluid communication with, the upper chamber, the divider being deflectable toward the lower chamber and also toward the upper chamber;

at least one vent opening structured to enable fluid communication between the interior and an exterior of the airbag; and

a vent cover closable over the at least one vent opening so as to restrict a flow of gas through the at least one vent opening, the vent cover also being openable so as to permit an unobstructed flow of gas through the at least one vent opening wherein said vent cover is opened based on a predetermined deflection of the divider,

wherein the divider is structured to deflect in a direction toward the first chamber responsive to pressure exerted on the airbag exterior by contact with a torso of a vehicle occupant, prior to contact between a head of the occupant and the airbag.

17. A vehicle occupant protection system comprising an airbag in accordance with claim 16 .

18. An airbag system comprising an airbag in accordance with claim 16 .

19. A vehicle including an airbag in accordance with claim 16 .

20. The airbag of claim 16 wherein said vent cover is closable to restrict a flow of gas through the at least one vent opening when the divider is deflected in a first direction, and openable so as to permit an unobstructed flow of gas through the at least one vent opening, the vent cover being operatively coupled to the divider such that the vent cover is openable when the divider is deflected in a direction toward the first chamber and closed when the divider is deflected toward the second chamber.