WO2004071820A1 - Airbag module for selectively venting airbag inflation gas - Google Patents

Airbag module for selectively venting airbag inflation gas Download PDF

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Publication number
WO2004071820A1
WO2004071820A1 PCT/US2003/040008 US0340008W WO2004071820A1 WO 2004071820 A1 WO2004071820 A1 WO 2004071820A1 US 0340008 W US0340008 W US 0340008W WO 2004071820 A1 WO2004071820 A1 WO 2004071820A1
Authority
WO
WIPO (PCT)
Prior art keywords
airbag
gas flow
airbag module
flow diverter
gas
Prior art date
Application number
PCT/US2003/040008
Other languages
French (fr)
Inventor
Brian Ford
Joel Jerrim
Rolf Sawall
Original Assignee
Key Safety Systems, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Key Safety Systems, Inc. filed Critical Key Safety Systems, Inc.
Priority to EP03797030A priority Critical patent/EP1590211A1/en
Priority to AU2003297958A priority patent/AU2003297958A1/en
Priority to JP2004568327A priority patent/JP4199733B2/en
Publication of WO2004071820A1 publication Critical patent/WO2004071820A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
    • B60R21/217—Inflation fluid source retainers, e.g. reaction canisters; Connection of bags, covers, diffusers or inflation fluid sources therewith or together
    • B60R21/2171—Inflation fluid source retainers, e.g. reaction canisters; Connection of bags, covers, diffusers or inflation fluid sources therewith or together 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/231—Inflatable members characterised by their shape, construction or spatial configuration
    • B60R21/2334—Expansion control features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
    • B60R21/2644—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/276—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow with means to vent the inflation fluid source, e.g. in case of overpressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/276—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow with means to vent the inflation fluid source, e.g. in case of overpressure
    • B60R2021/2765—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow with means to vent the inflation fluid source, e.g. in case of overpressure comprising means to control the venting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/30—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow with means to draw ambient air into the flow line and mix such air with the inflation fluid

Definitions

  • Figure 5 illustrates a section view through a squib.
  • the sensor 61 may be a crash severity sensor that provides the control unit 62 with information concerning the force of the crash. With greater crash severity, the control unit 62 would permit the inflator 22 to fill the airbag 14 for a longer period of time. Conversely, if the crash were less severe, then the control unit 62 would actuate the gas flow diverter 30 sooner.
  • the invention accordingly permits a greater variety of inflation levels depending upon assessed conditions involving the vehicle crash. In each instance, one single stage inflator 22 may be employed to provide a variety of inflation levels of an airbag 14 thereby saving significant costs.

Abstract

An airbag module (10) comprises an airbag inflatable through an opening and an airbag inflator (22) in communication with at least one opening (18; 154, 160). At least one gas flow diverter (30; 124, 128) selectively diverts inflation gas (26) away from the airbag opening (18; 154, 160). The gas flow diverter(s) (30; 124, 128) may move from a first position and a second position, the first position permitting the inflation gas (26) to flow to the opening and the second position deflecting the inflation gas (26) away from the opening (18; 154, 160).

Description

AIRBAG MODULE FOR SELECTIVELY VENTING AIRBAG INFLATION GAS
This invention relates to an airbag module that selectively diverts inflation gas away from an airbag.
Airbag modules typically comprise an airbag and an airbag inflator. When triggered by a crash detection system, the airbag inflator provides gas to inflate the airbag. The inflated airbag serves as a cushion against injury for a vehicle occupant. The location of the vehicle occupant with respect to the airbag may affect the effectiveness of the airbag as a cushion. If the vehicle occupant is too close to the airbag, the full inflation of the airbag may result in less than optimal cushioning of any impact. It is desirable to inflate the airbag to less than full capacity when the vehicle occupant is too close to the airbag.
Known systems can sense when a vehicle occupant is too close to the airbag, so that the airbag is inflated to less than full capacity. A dual -stage inflator inflates the airbag with a first stage that partially inflates the airbag, and a second stage triggered later to inflate the airbag to a maximum level.
A dual-stage inflator is generally more expensive than a single-stage inflator and these inflators only inflate the airbag to two different levels. Having only two different inflation levels for the airbag may not adequately accommodate the multiple positions of the vehicle occupant during a crash. The vehicle occupant may be too close to the airbag during deployment to expand the airbag with the high output, but yet be too far away from the airbag for a low output level inflation. The present invention allows for virtually any level of airbag inflation. In addition to altering the inflation level of the airbag due to vehicle occupant position, it may be desirable to inflate the airbag to more than two different levels under different circumstances. The weight of the vehicle occupant affects the level of inflation in a crash because a heavier vehicle occupant requires more cushioning than a lighter vehicle occupant. Different levels of crash severity may necessitate a greater range of inflation levels.
Claim 1 describes a simple and inexpensive airbag module that permits an airbag to be inflated to a greater variety of inflation levels. Brief Description of the Drawings
The drawings that accompany the detailed description are briefly described below.
Figure 1 illustrates an airbag module according to the present invention, including an airbag, an inflator, and a gas flow diverter.
Figure 2 illustrates the airbag module of Figure 1 with the gas flow diverter in position to channel inflation gas to the airbag.
Figure 3 illustrates the airbag module of Figure 1 with the gas flow diverter in place to channel inflation gas away from the airbag's gas intake opening.
Figure 4 illustrates the positions of the gas flow diverter.
Figure 5 illustrates a section view through a squib.
Figure 6 illustrates various inflator pressure verses time curves that can be generated with the present invention.
Figure 7 illustrates another version of an airbag module according to the present invention.
Detailed Description of the Invention
Figure 1 illustrates an airbag module 10 according to the present invention. Like existing airbag modules, an airbag module 10 according to the present invention comprises airbag 14 and airbag inflator 22. An airbag inflator 22 is controlled by a control unit 62, which is in communication with a crash detection system (not shown). When a crash is detected, the airbag inflator 22 rapidly emits an inflation gas through an opening 18 into airbag 14 as shown in Figure 2. Inflation gas 26 from the inflator 22 passes through a first passage 70 and an opening 18 into the airbag 14 to inflate the airbag 14.
In contrast to existing airbag modules, however, an airbag module 10 according to the present invention has a gas flow diverter 30, here a flap, having a first position 46 as shown in Figures 2 and 4 and a second position 50 as shown in Figures 3 and 4. The gas flow diverter 30 preferably comprises a metal flap having a hinge 38, here a groove across the metal flap. The hinge 38 pivotally attaches a first gas flow diverter portion 33 to a second gas flow diverter portion 35. The second gas flow diverter portion 35 is moveable between a first position 46 and a second position 50. As shown in Figures 3 and 4, when the airbag 14 has reached a selected inflation level, the control unit 62 controls the actuator 54, here a squib, a pyrotechnic device that produces a blast of gas to move the gas flow diverter 30 from a first position 46 indicated by an arrow A towards a second position 50. The squib 54 typically only produces enough gas to move the second gas flow diverter portion 35 to an intermediate position 120 (although it may be made to move the second gas flow diverter portion 35 all the way to the second position 50). However, since the inflation gas 26 is moving by the gas flow diverter 30 as indicated by an arrow 122 in the drawing at high pressure and speed, the inflation gas 26 causes the gas flow diverter 30 to move completely to a second position 50.
The gas flow diverter 30 deforms along a hinge 38, which is the groove in the metal flap. Because the gas flow diverter 30 comprises metal, the gas flow diverter 30 will deform and maintain a second position 50 and not flutter, thereby permitting the gas flow diverter 30 to act as a seal for the opening 18. High temperature plastics and ceramics may be used instead of metal. Once in position 50 as shown in Figures 3 and 4, the gas flow diverter 30 seals the opening 18 and diverts inflation gas 26 away from the opening 18. In moving from a first position 46 to a second position 50, the gas flow diverter 30 helps form a second passage 74, which communicates inflation gas 26 away from the airbag 14 and preferably behind an instrument panel (not shown) so that the inflation gas 26, which is typically very hot, is safely communicated away from the vehicle occupant. Moreover, the hinge 38 attaches a first gas flow diverter portion 33 to a second gas flow diverter portion 35 so that these portions 33, 35 will not separate when the gas flow diverter 30 is actuated.
As shown in Figure 5, the squib 54 comprises an igniter assembly 100, a gas generant 102, and an optional piston 104 that are pressed into a housing 106. When the igniter assembly 100 receives an electrical signal, it causes the generant 102 to undergo a chemical reaction that changes the generant 102 from a solid to a high-pressure gas. This gas then acts on the gas flow diverter 30 to move it from a first position 46. Additionally, a piston 104 can be added to the squib 54 so that more pressure will be built up behind piston 104 before contacting the gas flow diverter 30. In this manner less generant 102 will be required for the squib to function.
An airbag module 10 according to the present invention may be used in conjunction with a vehicle occupant position sensor 66. In Figures 1-3, the vehicle occupant position sensor 66 is in communication with a control unit 62. Based on the position of the vehicle occupant detected by the sensor 66, the control unit 62 determines the proper level of inflation for the airbag 14 and controls its inflation through the actuation of the gas flow diverter 30 by the actuator 54. The vehicle occupant position sensor may be a weight sensor on a seat, infrared sensors in the vehicle's cabin, an airbag cushion sensor or other known device. Thus, a portion of the inflation gas 26 from the inflator 22 may be passed to the airbag 14 while the remainder may be vented away from airbag 14 so that airbag 14 is inflated to a desirable level based on the location of the vehicle occupant.
Referring to Figure 6, it may be desirable to use the airbag module of the present invention without a sensor if a gas generating airbag inflator is employed. The present invention may employ a stored gas airbag inflator, a gas generating airbag inflator, or a hybrid airbag inflator. Since a gas generating airbag inflator 22 produces gas with a chemical reaction, it is difficult to alter this reaction once it has begun. As a result, a gas generating airbag inflator can typically produce only a limited number of pressure verses time curves as represented by plot 108. The present invention offers a way to produce a wider variety of inflator pressure versus time curves as represented by 110, 112, and 114. This is accomplished by programming the control unit 62 to activate the actuator 54 at a predetermined time after the inflator 22 has begun to generate gas. This has the effect of diverting the reminder of the inflation gas away from the airbag 14 so that lower pressure verses time curves can be created from the same high output inflator. This variety of curves permit the airbag 14 to be filled to a greater variety of different levels depending upon the point in time the gas flow diverter 30 is actuated. Curve 112 shows earlier actuation of gas flow diverter 30 than curve 110, while curve 110 shows earlier actuation than curve 114, and curve 114 shows earlier actuation than curve 108. This technique for deployment of an airbag 14 permits more controlled inflation based on assessed conditions other than occupant position. For example, in to Figure 1 , the sensor 62 may be a sensor in a seat of a vehicle that detects the weight of a vehicle occupant. Based on this information, the control unit 62 may determine the most desirable inflation level for the airbag 14 and permit the inflator 22 to fill the airbag 14 for a predetermined amount of time to reach this level and then actuate the gas flow diverter 30 to seal the opening 18 and divert the remainder of the gas from inflator 22. If the vehicle occupant weighed more the control unit 62 would actuate the gas flow diverter 30 later in time.
The sensor 61 may be a crash severity sensor that provides the control unit 62 with information concerning the force of the crash. With greater crash severity, the control unit 62 would permit the inflator 22 to fill the airbag 14 for a longer period of time. Conversely, if the crash were less severe, then the control unit 62 would actuate the gas flow diverter 30 sooner. The invention accordingly permits a greater variety of inflation levels depending upon assessed conditions involving the vehicle crash. In each instance, one single stage inflator 22 may be employed to provide a variety of inflation levels of an airbag 14 thereby saving significant costs.
The control unit 62 could be programmed to deploy the gas flow diverter 30 at a predetermined time without any data from an occupant detection system. This would be desirable when it is necessary to change the pressure verses time curve for an aggressive inflator as represented by curve 108. If a curve represented by curve 110 is desired, the controller could be programmed to automatically fire the actuator 54 at a predetermined time to achieve curve 110.
Figure 7 illustrates another version of an airbag module 120 according to the present invention. The airbag 14 receives inflation gas from the inflator 22 as previously described. Here, two gas flow diverters 124, 128 pivot along hinges 132, 136 as indicated by the arrows 140, 144 when moved by the actuators 148, 152, respectively. The control unit 62 controls actuation of the actuators 148, 152 based on information received from the sensor 61 or another sensor. Following actuation, the gas flow diverter 124 opens a vent 156 of airbag 14 while the gas flow diverter 128 opens a vent 160. Remaining inflation gas emitted from the inflator 22 is then diverted from the vents 124, 156 into the surrounding environment.
Moreover, the gas flow diverters 124, 128 may be employed with a third gas flow diverter 30 so that three gas flow diverters may be actuated to open three vents of airbag 14. Each gas flow diverter 124, 128 and 30 may be individually or in combination controlled to permit greater control of inflation of the airbag 14. For example, one gas flow diverter 124 may be left unactuated while another gas flow diverter 128 is actuated, leaving a first opening 154 unsealed and a second opening 160 sealed to permit the airbag 14 to bleed inflation gas during inflation and during cushioning through the first opening 154. The airbag 14 would then be softer than if both openings 154, 160 were sealed or if the second opening 160 were left open and the first opening 156 closed. The invention thus permits the airbag 14 to provide an increased variety of deployment and cushioning levels.

Claims

CLAIMS:
1. An airbag module (10) comprising: an airbag inflatable through at least one opening (18; 154, 160); an airbag inflator (22) for communicating an inflation gas (26) into the at least one opening (18; 154, 160); and at least one gas flow diverter (30; 124, 128) in communication with the airbag inflator (22) for selectively directing the inflation gas (26) away from the at least one opening (18; 154, 160).
2. The airbag module (10) of Claim 1 wherein the at lest one gas flow diverter (30; 124, 128) is movable between a first position and a second position, the first position permitting the inflation gas (26) to flow to the at least one opening (18; 154, 160) and the second position deflecting the inflation gas (26) away from the at least one opening (18; 154, 160).
3. The airbag module (10) of Claim 2 wherein the at least one gas flow diverter (30; 124, 128) seals the at least one opening (18; 154, 160) in the second position.
4. The airbag module (10) of Claim 2 or 3 including at least one actuator (54; 148, 152) for selectively moving the at least one gas flow diverter (30; 124, 128) between the first position and the second position.
5. The airbag module (10) of Claim 4 wherein the at least one actuator (54; 148, 152) is a pyrotechnic device.
6. The airbag module (10) of Claim 2 or 3 wherein the airbag inflator (22) assists in moving the gas flow diverter (30; 124, 128) between the first position and the second position.
7. The airbag module (10) of Claim 4 or 5 including a control unit (62) controlling the at least one actuator (54; 148, 152).
8. The airbag module (10) of Claim 7 including a sensor in communication with the control unit (62).
9. The airbag module (10) of Claim 1 wherein the at least one gas flow diverter (30) is a flap.
10. The airbag module (10) of Claim 9 wherein the flap (30) has a hinge (38).
11. The airbag module of (10) Claim 10 wherein the hinge (38) resists movement of the flap (30).
12. The airbag module of (10) Claim 10 wherein the flap (30) comprises a first portion (33) and a second portion (35), the hinge (38) holding the first portion (33) to the second portion (35).
13. The airbag module (10) of Claim 10 wherein the flap (30) does not separate into two or more pieces during actuation.
14. The airbag module of (10) any of Claims 10 to 13 wherein the hinge (38) comprises a deformable material.
15. The airbag module (10) of any of Claims 1 to 14 having two openings (154, 160) for the airbag and two gas flow diverters (124, 128) in communication with the airbag inflator (22) for selectively directing the inflation gas (26) away from the second opening.
16. The airbag module (10) of any of Claims 1 to 15 wherein the at least one gas flow diverter (30; 124, 128) directs the inflation gas (26) outside of the airbag.
PCT/US2003/040008 2003-02-06 2003-12-17 Airbag module for selectively venting airbag inflation gas WO2004071820A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP03797030A EP1590211A1 (en) 2003-02-06 2003-12-17 Airbag module for selectively venting airbag inflation gas
AU2003297958A AU2003297958A1 (en) 2003-02-06 2003-12-17 Airbag module for selectively venting airbag inflation gas
JP2004568327A JP4199733B2 (en) 2003-02-06 2003-12-17 Airbag module for selectively exhausting air bag inflation gas

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/359,256 US7055856B2 (en) 2003-02-06 2003-02-06 Airbag module for selectively venting airbag inflation gas
US10/359,256 2003-02-06

Publications (1)

Publication Number Publication Date
WO2004071820A1 true WO2004071820A1 (en) 2004-08-26

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ID=32823795

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/040008 WO2004071820A1 (en) 2003-02-06 2003-12-17 Airbag module for selectively venting airbag inflation gas

Country Status (6)

Country Link
US (2) US7055856B2 (en)
EP (1) EP1590211A1 (en)
JP (1) JP4199733B2 (en)
KR (1) KR100676028B1 (en)
AU (1) AU2003297958A1 (en)
WO (1) WO2004071820A1 (en)

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US7055856B2 (en) 2006-06-06
AU2003297958A1 (en) 2004-09-06
US6830265B2 (en) 2004-12-14
US20040155442A1 (en) 2004-08-12
EP1590211A1 (en) 2005-11-02
JP2006513902A (en) 2006-04-27
KR20050093859A (en) 2005-09-23
KR100676028B1 (en) 2007-01-30
US20040155443A1 (en) 2004-08-12

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