Adaptive inflation performance using magnetic characteristics of gases

• US 6,913,285 B2
• Filed: 05/28/2003
• Issued: 07/05/2005
• Est. Priority Date: 05/28/2003
• Status: Expired due to Fees

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Green, David J., Rink, Karl K.
• Primary Examiner(s): Dickson, Paul N.
• Assistant Examiner(s): To, Toan C
• Application Number:
  US10/446,449
• Publication Number:
  US 20040239087A1
• Time in Patent Office: 769 Days
• Field of Search: 280/736, 280/737, 280/740, 280/741, 280/742, 102/530
• US Class Current: 280/736
• CPC Class Codes: B60R 2021/2633 with a plurality of inflation levels
• CPC Class Codes: B60R 2021/2685 comprising a plurality of pressure chambers
• CPC Class Codes: B60R 21/272 with means for increasing the pressure of the gas just before or during liberation, e.g. hybrid inflators

Abstract

An inflation system and method of operation are provided which utilize or employ the magnetic characteristics of certain gases to selectively alter or change one or more inflation characteristic of the inflation output provided thereby or resulting therefrom. An inflation system for providing a supply of inflation medium to an inflatable restraint element includes an inflator device having a first chamber having contents including a quantity of at least one gaseous material having magnetic characteristics. The inflation system also includes a magnetic field inductor in magnetic field change inducing communication with at least a portion of the first chamber contents quantity of the at least one gaseous material having magnetic characteristics, wherein activation of the magnetic field inductor effects a change in at least one inflation characteristic of the inflator device, e.g., rise rate, gas mass flow rate and pressure output, produced or generated by the inflator.

Claims

1. An inflation system for providing a supply of inflation medium to an inflatable restraint element, the inflation system comprising:

an inflator device having a first chamber, the first chamber having contents including a quantity of at least one gaseous material having magnetic characteristics and

a magnetic field inductor in magnetic field change inducing communication with at least a portion of the first chamber contents including the quantity of the at least one gaseous material having magnetic characteristics,

wherein activation of the magnetic field inductor effects a change in at least one inflation characteristic of the inflator device.

2. The inflation system of claim 1 wherein the at least one inflation characteristic of the inflator device affected by activation of the magnetic field inductor is rise rate.

3. The inflation system of claim 1 wherein the at least one inflation characteristic of the inflator device affected by activation of the magnetic field inductor is P_MAX.

4. The inflation system of claim 1 wherein the first chamber contents include nitrous oxide.

5. The inflation system of claim 1 wherein the at least one gaseous material having magnetic characteristics is paramagnetic.

6. The inflation system of claim 5 wherein the at least one paramagnetic gaseous material is an oxidant gas source.

7. The inflation system of claim 6 wherein the oxidant gas source paramagnetic gaseous material is oxygen.

8. The inflation system of claim 6 wherein the first chamber also contains a quantity of a first fuel-rich pyrotechnic reactant actuatable to produce first gaseous inflation medium products.

9. The inflation system of claim 1 wherein the first chamber contents also include at least one gaseous material free of magnetic characteristics.

10. The inflation system of claim 9 wherein the at least one gaseous material free of magnetic characteristics is an inert gas.

11. The inflation system of claim 10 wherein the inert gas is argon.

12. The inflation system of claim 1 wherein the magnetic field inductor is disposed within the inflator device.

13. The inflation system of claim 12 wherein the magnetic field inductor is disposed within the first chamber.

14. The inflation system of claim 12 wherein the magnetic field inductor comprises an electromagnet.

15. The inflation system of claim 1 additionally comprising a second chamber and a barrier between the first and second chambers effective to at least in part limit gas flow communication between the first and second chambers.

16. The inflation system of claim 15 wherein the second chamber houses the magnetic field inductor.

17. The inflation system of claim 15 wherein the barrier is actuatable to prevent gas flow communication between the first and second chambers.

18. The inflation system of claim 15 wherein the first chamber contains a quantity of a first fuel-rich pyrotechnic reactant actuatable to produce first gaseous inflation medium products and the second chamber contains a quantity of a second fuel-rich pyrotechnic reactant actuatable to produce second gaseous inflation medium products.

34. The inflation system of claim 1 wherein the at least one inflation characteristic of the inflator device affected by activation of the magnetic field inductor is gas mass flow rate.

19. A method for operating an inflator device, the method comprising:

placing a quantity of at least one gaseous material having magnetic characteristics in a first chamber of the inflator device and

inducing a change in the magnetic characteristics of at least a portion of the quantity of the at least one gaseous material to effect a change in at least one inflation characteristic of the inflator device.

20. The method of claim 19 wherein the at least one gaseous material having magnetic characteristics is paramagnetic.

21. The method of claim 20 wherein the at least one paramagnetic gaseous material is an oxidant gas source.

22. The method of claim 21 wherein the oxidant gas source paramagnetic gaseous material is oxygen.

23. The method of claim 19 wherein the at least one inflation characteristic of the inflator device affected by the inducing a change in the magnetic characteristics of at least a portion of the quantity of the at least one gaseous material is rise rate.

24. The method of claim 19 wherein the at least one inflation characteristic of the inflator device affected by the inducing a change in the magnetic characteristics of at least a portion of the quantity of the at least one gaseous material is gas mass flow rate.

25. The method of claim 19 wherein the at least one inflation characteristic of the inflator device affected by the inducing a change in the magnetic characteristics of at least a portion of the quantity of the at least one gaseous material is P_MAX.

26. The method of claim 19 wherein the first chamber contents include nitrous oxide.

27. The method of claim 19 wherein the at least one gaseous material having magnetic characteristics is paramagnetic.

28. The method of claim 27 wherein the at least one paramagnetic gaseous material is an oxidant gas source.

29. The method of claim 28 wherein the oxidant gas source paramagnetic gaseous material is oxygen.

30. The method of claim 19 wherein the inducing a change in the magnetic characteristics of at least a portion of the quantity of the at least one gaseous material comprises activating a magnetic field inductor in magnetic field change inducing communication with at least a portion of the first chamber contents quantity of the at least one gaseous material having magnetic characteristics.

31. The inflation system of claim 30 wherein the magnetic field inductor is disposed within the inflator device.

32. The inflation system of claim 30 wherein the magnetic field inductor is disposed within the first chamber.

33. The inflation system of claim 30 wherein activation of the magnetic field inductor effects a change in magnetic field strength.