Airbag device

• US 20050151353A1
• Filed: 12/22/2004
• Published: 07/14/2005
• Est. Priority Date: 12/22/2003
• Status: Active Grant

• Current Assignee: Joyson Safety Systems Japan K.K.
• Original Assignee: Takata Corporation (Ningbo Junsheng Investment Group Co., Ltd.)
• Inventors: Kumagai, Masayoshi
• Granted Patent: US 7,350,805 B2
• Time in Patent Office: Days
• US Class Current: 280/731
• CPC Class Codes: B60R 2021/01225 control of expansion volume
• CPC Class Codes: B60R 21/01504 detecting bag displacement
• CPC Class Codes: B60R 21/01528 mounted on the bag
• CPC Class Codes: B60R 21/2035 using modules containing inflator, bag and cover attachable to the steering wheel as a complete sub-unit steering wheel covers with tear lines B60R21/21656; assembling of modules B60R21/217
• CPC Class Codes: B60R 21/205 in dashboards
• CPC Class Codes: B60R 21/2165 characterised by a tear line for defining a deployment opening
• CPC Class Codes: B60R 21/2171 specially adapted for elongated cylindrical or bottle-like inflators with a symmetry axis perpendicular to the main direction of bag deployment, e.g. extruded reaction canisters B60R21/2176 takes precedence
• CPC Class Codes: B60R 21/276 with means to vent the inflation fluid source, e.g. in case of overpressure B60R21/30 takes precedence; venting means on inflatable member walls B60R21/239

Abstract

An airbag device is provided to prevent an airbag from being deployed or to reduce the deployment force of an airbag when an airbag device or a vehicle-body component adjacent to the airbag device is leaned against by a vehicle occupant. In one form, a passenger-seat airbag device is set in an instrument panel and includes a bracket which is fixed to a vehicle-body member with, for example, a bolt. A strain gauge is attached to the bracket. When a lid covering the front side of a retainer is leaned against by a vehicle occupant, the weight of the occupant is transmitted to the bracket via the retainer, such that a small strain is generated in the bracket. Such a strain is detected by the strain gauge to allow the deployment force of the airbag to be reduced.

Claims

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

an airbag operatively mounted to a predetermined component of the vehicle;

a gas generator for inflating the airbag with inflation gas; and

a detector for detecting a load applied to the predetermined component of the vehicle to allow inflation of the airbag to be controlled based on the applied load.

2. The airbag device of claim 1 including a retaining assembly for mounting the airbag to the predetermined component of the vehicle, and the detector is arranged to detect loads transmitted to the retaining assembly from the predetermined vehicle component.

3. The airbag device of claim 1, wherein the detector comprises one of a strain gauge and a displacement sensor.

4. The airbag device of claim 1 including a retainer to which the airbag is secured, the retainer having gas exhaust apertures, and an aperture blocking device that includes an aperture blocking member for being shifted between a blocking position relative to the retainer gas exhaust apertures with no applied load detected by the detector for providing the airbag with an entire volume of inflation gas from the gas generator, and an open position relative to the retainer gas exhaust apertures with an applied load detected by the detector for reducing an inflation rate of the airbag.

5. The airbag device of claim 4 wherein the airbag includes a portion secured to the retainer extending over the gas exhaust apertures, and with the blocking member shifted to the open position the gas generator is arranged to emit inflation gas with sufficiently high temperature and pressure to breach material of the airbag portion aligned with the gas exhaust apertures.

6. The airbag device of claim 1 wherein the gas generator has different levels of inflation gas output to allow the inflation gas output to be reduced with detection of an applied load by the detector.

7. The airbag device of claim 1 in combination with the vehicle wherein the vehicle includes an instrument panel and a steering wheel with the predetermined component of the vehicle being one of the instrument panel and the steering wheel.

8. A vehicle having a passenger compartment, the vehicle comprising:

an instrument panel in the vehicle passenger compartment;

a steering wheel in the vehicle passenger compartment;

an airbag device associated with at least one of the instrument panel and the steering wheel and having an airbag for being inflated in the passenger compartment during vehicle emergency conditions; and

a lean force detector of the airbag device that detects a load applied by a passenger engaging and leaning against the one of the instrument panel and the steering wheel.

9. The vehicle of claim 8 wherein the airbag device includes a retainer assembly for the airbag and having a cover that includes an outer surface which is integrated with the one of the instrument panel and the steering wheel with the detector determining loads applied against the integrated cover outer surface.

10. The vehicle of claim 8 wherein the lean force detector comprises one of a strain gauge and a displacement sensor.

11. The vehicle of claim 8 wherein the airbag device includes a gas generator for supplying inflation gas to the airbag and arranged closely adjacent a portion of the airbag, and

a blocking device between the gas generator and the airbag portion that is shifted upon detection of the load applied by the passenger to the one of the instrument panel and the steering wheel to expose the airbag portion so that inflation gas emitted from the gas generator breaches the airbag portion to reduce inflation rate of the airbag.

12. The vehicle of claim 11 wherein the blocking device comprises a retainer having apertures, a heat shield having apertures aligned with the retainer apertures with the airbag portion being between the retainer and heat shield, and a blocking member overlying the heat shield and having apertures with shifting of the blocking device comprising shifting of the blocking member to move the blocking member apertures into alignment with the aligned retainer and heat shield apertures for exposing the airbag portion aligned with the aligned apertures to the inflation gas from the gas generator.

13. The vehicle of claim 8 wherein the airbag device has a gas generator having different levels of inflation gas output to allow the inflation gas output to be reduced with detection of an applied load by the lean force detector.

14. The vehicle of claim 8 wherein the airbag device includes a retainer assembly for the airbag for substantially rigidly securing the airbag device to the one of the instrument panel and the steering wheel so that loads applied thereto are transmitted to the retainer assembly, and the lean force detector comprises a strain gauge mounted to the retainer assembly for detecting strain in the retainer assembly generated by the applied load to the one of the instrument panel and steering wheel.

15. The vehicle of claim 8 wherein the airbag device includes a retainer assembly having a pair of members that shift relative to each with the applied load to the one of the instrument panel and steering wheel, and the lean force detector comprises a displacement sensor mounted between the pair of retainer assembly members for detecting relative shifting thereof.

16. The vehicle of claim 15 wherein the displacement sensor comprises one of an electrical-capacitive sensor, a differential transformer sensor, and a Doppler sensor.

17. The vehicle of claim 16 wherein the electrical capacitive sensor includes a moveable member biased toward one of the pair of retainer assembly members and a main body mounted on the other of the pair of retainer assembly members and into which the moveable member is pushed against the bias thereof upon application of a load to the one of the instrument panel and the steering wheel.

18. The vehicle of claim 8 wherein the airbag device includes a retainer assembly for the airbag and having a retainer and mounting members with portions of adjacent ones of the mounting members arranged to extend substantially parallel to each other and transverse to a surface of the instrument panel or steering wheel so that loads applied to the surface cause the parallel portions to shift relative to each other, and the lean force detector is mounted between the parallel portions of the mounting members.