Airbag arrangement

Abstract

An airbag arrangement (3) for a vehicle (1). The airbag arrangement comprises an inflatable airbag (5) and an external extension control member (7) being operatively associated with said airbag. The airbag is adapted to be inflated in a longitudinal direction (x) of the vehicle to a position between an interior portion (13) of the vehicle in front of a seated vehicle occupant (17) and an upper body region (19) of the seated vehicle occupant. The external extension control member has a selectable operative length (l.sub.o). The external extension control member controls deployment of the airbag by means of the selectable operative length. The present disclosure also relates to a vehicle comprising the airbag arrangement and a method for deploying an airbag of the airbag arrangement.

Claims

1. An airbag arrangement for a vehicle, said airbag arrangement comprising an inflatable airbag and an external extension control member being operatively associated with said airbag, said airbag being adapted to in a deployed state be inflated in a longitudinal direction (x) of said vehicle to a position between an interior portion of said vehicle in front of a seated vehicle occupant and an upper body region of said seated vehicle occupant, wherein said external extension control member has a selectable operative length (l.sub.o.sup.1, l.sub.o.sup.2, l.sub.o.sup.3, l.sub.o.sup.4, l.sub.o.sup.5), and wherein said external extension control member controls deployment of said airbag by means of said selectable operative length (l.sub.o.sup.1, l.sub.o.sup.2, l.sub.o.sup.3, l.sub.o.sup.4, l.sub.o.sup.5), wherein said airbag in an unrestricted deployed state has a substantially rectangular shape, for which a longitudinal extension (L) of said airbag is significantly greater than a vertical extension (T) of said airbag, said shape allowing rolling of said airbag upon itself starting at a distal end, the extent to which said airbag is forced to roll out in said deployed state being controlled by said selectable operative length (l.sub.o.sup.1, l.sub.o.sup.2, l.sub.o.sup.3, l.sub.o.sup.4, l.sub.o.sup.5) of said external extension control member.

2. The airbag arrangement of claim 1, wherein said selectable operative length (l.sub.o.sup.1, l.sub.o.sup.2, l.sub.o.sup.3, l.sub.o.sup.4, l.sub.o.sup.5) of said external extension control member controls a depth (d.sub.1, d.sub.2, d.sub.3, d.sub.4, d.sub.5, d.sub.6) of said airbag arrangement when in a deployed state, said depth (d.sub.1, d.sub.2, d.sub.3, d.sub.4, d.sub.5, d.sub.6) being a largest extension of said airbag arrangement in said longitudinal direction (x) of said vehicle.

3. The airbag arrangement of claim 1, wherein said external extension control member has a minimum selectable operative length and a maximum selectable operative length, and wherein a difference between said maximum selectable length and said minimum selectable operative length is in a range of from 10 to 110 cm.

4. The airbag arrangement of claim 1, wherein a support structure, located at or comprised in said interior portion, anchors a proximal end or proximal portion of said airbag to said vehicle, and said external extension control member connects a distal portion of said airbag to said support structure.

5. The airbag arrangement of claim 4, wherein said external extension control member comprises an attachment to said airbag at said distal portion, said attachment being located at a distance (D) from said distal end of said airbag, preferably in a range of from 10% of said longitudinal extension (L) of said airbag to 50% of said longitudinal extension (L) of said airbag, said distal end being most distal from an inflation point of said airbag.

6. The airbag arrangement of claim 1, wherein said airbag in said unrestricted deployed state has a larger extension (L) in a longitudinal direction (x) than in a transversal direction (y) and a vertical direction (z), said extension (L) in said longitudinal direction (x) being in a range of from 50 to 250 cm, said longitudinal (x), transversal (y) and vertical (z) directions being perpendicular to each other.

7. The airbag arrangement of claim 5, wherein said depth (d.sub.1, d.sub.2, d.sub.3, d.sub.4, d.sub.5, d.sub.6) of said airbag arrangement in a deployed state is in a range of from 20% of said longitudinal extension (L) of said airbag to 80% of said longitudinal extension (L) of said airbag.

8. The airbag arrangement of claim 1, wherein said external extension control member comprises a selectively releasable extension portion controlling said selectable operative length (l.sub.o.sup.1, l.sub.o.sup.2, l.sub.o.sup.3, l.sub.o.sup.4, l.sub.o.sup.5).

9. The airbag arrangement of claim 8, wherein said selectively releasable extension portion forms a fold or a loop of said external extension control member, said fold or loop being releasably attached to the rest of said external extension control member and wherein upon releasing said selectively releasable extension portion, said operative length of said external extension control member is increased by said selectively releasable extension portion.

10. The airbag arrangement of claim 1, wherein said airbag arrangement comprises length selection means for controlling said selectable operative length (l.sub.o.sup.1, lo.sub.2, l.sub.o.sup.3, l.sub.o.sup.4, l.sub.o.sup.5) of said external extension control member.

11. The airbag arrangement of claim 1, wherein said external extension control member comprises or consists of a panel, a mesh or one or more straps or belts.

12. A vehicle comprising an interior portion of said vehicle at a location in front of a seated vehicle occupant and an airbag arrangement of claim 1, said airbag being adapted to be inflated to a position between said interior portion of said vehicle and an upper body region of said seated vehicle occupant.

13. The vehicle of claim 12, said vehicle further comprising at least one sensor for detecting a position of a seated vehicle occupant, the output of said sensor being used as a basis to select said operative length of said external extension control member.

14. A method for deploying an airbag of an airbag arrangement according to claim 1, said method comprising: (a) detecting a position of a seated vehicle occupant, (b) based on said detected position, selecting said operative length of said external extension control member, and (c) based on said selection, deploying said airbag under control by said external extension control member, wherein the extent to which said airbag is forced to roll out in said deployed state is controlled by said selectable operative length (l.sub.o.sup.1, l.sub.o.sup.2, l.sub.o.sup.3, l.sub.o.sup.4, l.sub.o.sup.5) of said external extension control member.

15. The method of claim 14, wherein said airbag arrangement comprises length selection means for controlling said selectable operative length of said external extension control member and wherein step (b) comprises controlling said selectable operative length by means of said length selection means.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The present invention will hereinafter be further explained by means of non-limiting examples with reference to the appended drawings wherein:

(2) FIGS. 1a and b illustrate a first and a second deployment state of an airbag arrangement according to the present invention;

(3) FIGS. 2a, 2b and 2c illustrate another embodiment of deployment states of an airbag arrangement according to the present invention;

(4) FIGS. 3a, 3b and 3c illustrate an embodiment of an airbag of an airbag arrangement according to the present invention;

(5) FIG. 4 illustrates a vehicle comprising an airbag arrangement according the present invention, and

(6) FIG. 5 illustrates a method according to the present invention.

(7) It should be noted that the appended drawings are schematic and that individual components are not necessarily drawn to scale and that the dimensions of some features of the present invention may have been exaggerated for the sake of clarity.

DETAILED DESCRIPTION

(8) The invention will, in the following, be exemplified by embodiments. It should however be realized that the embodiments are included in order to explain principles of the invention and not to limit the scope of the invention, as defined by the appended claims. A feature from one embodiment may be combined with one or more features of any other embodiment.

(9) The present invention and its advantage over the prior art will be further explained with reference to FIGS. 1 to 5. Directions as used herein relate to known extensions and directions of and in a vehicle 1. As such, the vehicle extends in a longitudinal direction x, a transversal direction y and a vertical direction z, which directions are perpendicular to each other, see FIGS. 1a and 1b. The longitudinal direction x is the normal driving direction of the vehicle 1. The transversal direction y is a width direction of the vehicle 1. The vertical direction z is a height direction of the vehicle.

(10) FIGS. 1a and 1b schematically illustrate a vehicle 1 comprising an airbag arrangement 3 according to an embodiment of the present invention. The airbag arrangement 3 comprises an airbag 5, deployed in two different deployed states, and an external extension control member 7 extended to two different lengths. FIG. 1a shows a first deployed state and FIG. 1b shows a second deployed state. The vehicle 1 is only schematically depicted. The vehicle 1 may be an autonomous drive (AD) vehicle. The airbag arrangement 3 comprises a housing 9 in which the inflatable airbag 5, when undeployed, is stored. In this embodiment an inflator 11 for inflating and deploying the airbag 5 is also stored in the housing 9. However, the inflator 11 may also be stored at a location spaced apart from the housing 9. The housing 9 is depicted at an upper portion 13 of an instrument panel 15 in front of a seated vehicle occupant 17. The inflator 11 is schematically illustrated in the housing 9. As illustrated, the airbag 5 is to be inflated and thereby be deployed to a position between the upper portion 13 of the instrument panel 15 and an upper body region 19 of the seated vehicle occupant 17. The airbag 5 is operatively connected to the inflator 11 for receiving gas therefrom.

(11) The housing 9 is located, see FIGS. 1a and 1b, in a portion 13 of the instrument panel 15 in front of the seated vehicle occupant 17. In this way, protection may be provided not only for passenger side occupants, but it may also provide protection on the driver side of the vehicle 1 when the steering wheel has been replaced by a different solution or entirely removed, as envisaged in an AD vehicle for example, or for a seated occupant in any seat in a vehicle. Hence, the housing 9 may be comprised in any interior portion of the vehicle 1 in front of the seated vehicle occupant 17, such as a backrest of a vehicle seat in case the seated vehicle occupant is seated in a rear seat of a vehicle. Thus, the airbag arrangement 3 as described herein is not limited to protection of occupants seated in a front seat of a vehicle 1 next to an instrument panel 15. The housing 9 may as an alternative or complement also be comprised and fixed in a steering wheel center if the vehicle comprises a steering wheel for manual driving and the airbag arrangement then providing protection for a driver of the vehicle during a frontal vehicle collision.

(12) The longitudinal x, transversal y and vertical z directions of the vehicle 1 are also used herein to describe the airbag 5. It is then assumed that the directions relate to the airbag 5 as mounted in a vehicle 1. However, the airbag arrangement 3 may also be manufactured and sold as a separate unit. It may then during e.g. transport or storage assume another orientation than when mounted in the vehicle 1.

(13) The airbag arrangement 3 depicted in FIGS. 1a and 1b comprises an external extension control member 7 operatively associated with the airbag 5 and adapted to control deployment of the airbag 5. The external extension control member 7 is situated exteriorly to the inflated airbag 5. Hence, the external extension control member 7 connects to an exterior surface of the airbag 5. The external extension control member 7 connects a distal portion 23 of the airbag 5 to a support structure that anchors a proximal end 27 of the airbag 5, i.e. the housing 9 of the airbag arrangement 3.

(14) The external extension control member 7 has in the deployed state in FIG. 1b a greater operative length l.sub.o.sup.2 than the operative length l.sub.o.sup.1 in the deployed state in FIG. 1a. Correspondingly, the rearward extension of the airbag 5 along the longitudinal direction x is greater in the deployed state in FIG. 1b than in the deployed state in FIG. 1a. Thus, a selectable operative length l.sub.o.sup.1, l.sub.o.sup.2 of the external extension control member 7 controls deployment of the airbag 5, and subsequently a depth d.sub.1, d.sub.2 of the airbag 5. The depth d.sub.1, d.sub.2 of the airbag 5 in this context is a largest extension of the airbag arrangement 3 in the longitudinal direction x.

(15) The operative length l.sub.o.sup.1, l.sub.o.sup.2 of the external extension control member 7 is the portion of the external extension control member 7 that extends between the attachments of the external extension control member 7, i.e. the attachment to the distal portion 23 of the airbag 5 and the attachment to the support structure, i.e. the housing 9 of the airbag arrangement 3.

(16) Two different deployed states, see FIGS. 1a and 1b, of the airbag arrangement 3 are depicted, one of which has a greater operative length l.sub.o.sup.2 of the external extension control member 7 and subsequently a greater depth d.sub.2 than the other. The depth d.sub.1, d.sub.2 of the airbag in the first and second deployed states, respectively, may correspond to a minimum depth and a maximum depth of the airbag arrangement 3, respectively, and hence may correspond to two preferred deployment states. As illustrated, the upper body region 19 of the seated vehicle occupant 17 is further rearwards in FIG. 1b in relation to the interior portion 15 of the vehicle 1 in front of seated vehicle occupant 17, as compared to in FIG. 1a. Hence, in the deployment state in FIG. 1b, the desired early interaction between the upper body region 19 of the seated vehicle occupant 17 and airbag 5 may be achieved through the greater operative length 12 of the external extension control member 7 and subsequently the depth d.sub.2 of the airbag 5.

(17) The external extension control member 7 may have a minimum selectable operative length and a maximum selectable operative length. A difference between the maximum selectable operative length and the minimum selectable operative length may be in a range of from 10 to 110 cm, preferably in a range of from 15 to 90 cm, more preferably in a range of from 20 to 70 cm, most preferably in a range of from 30 to 50 cm.

(18) A difference between the minimum depth of the airbag arrangement 3 and a maximum depth of the airbag arrangement 3 when in a deployed state may be at least 15 cm, preferably at least 20 cm, more preferably at least 25 cm, most preferably at least 30 cm.

(19) It is envisaged that the operative length l.sub.o.sup.3, l.sub.o.sup.4, l.sub.o.sup.5 of the external extension control member 7 may be selected to form any number of deployed states, for which respective deployed state, the depth d.sub.3, d.sub.4, d.sub.5 of the airbag arrangement 3 falls within a range from the minimum depth to the maximum depth of the airbag arrangement 3, as illustrated in FIGS. 2a to 2c. In FIGS. 2a to 2c, the airbag arrangement 3 comprising the airbag 5 and external extension control member 7 are schematically illustrated in three different deployed states of the airbag arrangement 3, which will be explained in further detail below.

(20) However, first reverting to FIGS. 1a and 1b, as is known to the skilled person, upon detection of a crash condition requiring deployment of the airbag, an actuation circuit is to be directed by a controller to initiate deployment of the airbag. Upon activation of the deployment of the airbag 5, it deploys into a space between the interior portion 13 of the vehicle in front of the seated vehicle occupant 17, i.e. the instrument panel 15 in the embodiment in FIGS. 1a and 1b, and the upper body region 19 of the seated vehicle occupant 17. Hence, the airbag 5 is adapted to be deployed in the longitudinal direction x.

(21) The same set-up is used in the different deployed states, i.e. a single inflator 11 inflates the airbag 5. The airbag 5 has the same or substantially the same inflated volume, i.e. the same deployed airbag volume is inflated independent of the selected operative length lo of the external extension control member 7. The airbag 5 extends to different depths d, based on the selected operative length l.sub.o of the external extension control member 7. This will be further detailed below.

(22) The airbag arrangement 3 as illustrated, having deployment states which extends further rearwards in the vehicle 1 based on the selected operative length of the external extension control member 7, implies an airbag arrangement 3 that enables an early interaction with the upper body region 19 of a seated vehicle occupant 17 under circumstances when the seated vehicle occupant 17 is positioned further rearwards in the vehicle 1, as may be the case when the vehicle seat can be adjusted more freely than, for example a vehicle where the adjustment range for is restricted or adapted for manual driving. It is envisaged that for example in an AD-vehicle, a more freely adjustable adjustment range may be desirable, in particular more adjustable to the rear of the vehicle, allowing a seated vehicle occupant to be in a more reclined or resting position.

(23) With reference to FIGS. 3a to 3c an airbag 3 of the airbag arrangement 5 according to an embodiment is schematically depicted in order to explain some features of the airbag 5. FIG. 3a shows a perspective view of the airbag 5 and FIGS. 3b and 3c illustrates the airbag 5 in different views, from above and from the side respectively. The airbag 5 is illustrated in an unrestricted deployed state. In this context, an unrestricted deployed state is a deployed state of the airbag 5 without influence of or restriction from the external extension control member.

(24) As illustrated, the airbag 5 then has a substantially flat, rectangular shape, typically similar to the shape of a mattress. The airbag 5 has extensions in a longitudinal x, a transversal y and a vertical z direction respectively. The airbag 5 has a larger extension L in the longitudinal direction x than in the transversal direction y and the vertical direction z. The longitudinal extension L may be in a range of from 50 to 250 cm, preferably in a range of from 80 to 240 cm, more preferably in a range of from 100 to 220 cm.

(25) The extension of the airbag 5 in the vertical direction z is referred to as the thickness T of the airbag 5 when deployed. The thickness T of the airbag 5 may be in a range of from 5 to 30 cm, preferably in a range of from 5 to 20 cm, more preferably in a range of from 5 to 15 cm.

(26) The transversal extension of the airbag, i.e. in a vehicle-width direction thus being referred to as the width W of the airbag 5 may be adapted to extend at least along the width of the seated vehicle occupant. The transversal extension W of the airbag may be in a range of from 20 to 90 cm, preferably in a range of from 30 to 80 cm.

(27) The airbag comprises a distal end 25 and a proximal end 27. The proximal end 27 is closest to an inflation point of the airbag 5. Hence, the proximal end 27 is anchored to the support structure. The distal end 25 is most distal from the inflation point when the airbag is in its unrestricted deployed state. Hence, the distal end 25 of the airbag 5 is the last portion of the airbag 5 to be inflated.

(28) Although the outer shape of the airbag 5 is depicted as substantially flat in the unrestricted deployed state, the airbag 5 may be comprised of a plurality of chambers, along the longitudinal direction, being separated by partitions formed inside the airbag, which may give the external surface of the airbag a wavy appearance, however whilst still maintaining a substantially rectangular mattress-like shape.

(29) When deployed, the airbag 5 is restricted by the external extension control member 7 from reaching its full extension, as illustrated in FIGS. 1a and 1b and FIGS. 2a to 2c. The depth d of the airbag arrangement 3 in a deployed state may be in a range of from 20% of the longitudinal extension L of the airbag 5 to 80% of the longitudinal extension L of the airbag 5, based on the selected operative length l.sub.o of the external extension control member.

(30) The mattress-like shape of the airbag 5 as described herein allows for an effective way of rolling the airbag upon itself, starting at the distal end, which rolled mattress-like shape may be maintained by the external extension control member 7. Thus, the airbag 5 is depicted as having a shape like that of a rolled mattress when in a deployed state in FIG. 1a. In FIG. 1b, the seemingly rolled mattress-like shaped airbag has been forced to roll out to a greater extent compared to the deployed state in FIG. 1a, thus, extending to a greater depth. The external extension control member 7 is correspondingly depicted as having a greater length. Thus, the operative length l.sub.o of the external extension control member controls the depth d of the airbag 5 when in a deployed state by controlling the extent to which the airbag is rolled out, or extended.

(31) An airbag 5 as described herein, being rolled upon itself, may result in a wide range of different curved shapes, such as a circle segment, e.g. semi-circle, or an arched shape or folded shape of the airbag depending on the constitution of the airbag itself. For example, if the airbag were to comprise partitions inside, as previously described, the partitions could act as folding lines. As a result, the shape of the airbag may be irregular whilst the airbag is rolled upon itself. i.e. not as smoothly curved as is illustrated in the embodiments in FIGS. 1a and 1b and FIGS. 2a to 2c.

(32) The airbag arrangement as described herein comprises length selection means for selecting the operative length l.sub.o of the external extension control member 7. This will be further detailed below.

(33) The longitudinal extension L of the airbag 5 in its unrestricted deployed state may define a maximum reachable rearward extension of the deployed airbag. However, as described, the external extension control member 7 comprises an attachment 31 to the distal portion 23 of the airbag 5, which attachment 31 is located at a distance D from the distal end 25 of the airbag 5, see FIGS. 3a and 3b, in which the dashed line indicates the plane of the attachment 31. The distance D from the distal end 25 to attachment 31 of the external extension control member 7 may be in a range of from 10% of the longitudinal extension L of the airbag 5 in an unrestricted deployed state to 50% of the longitudinal extension L of the airbag 5 in an unrestricted deployed state, preferably the distance D may be in a range of from 20% of the longitudinal extension L of the airbag 5 in an unrestricted deployed state to 40% of the longitudinal extension L of the airbag 5 in an unrestricted deployed state.

(34) In this way, by locating the point of attachment 31 of the external extension control member 7 to the airbag 5 at a distance D from the distal end 25 of the airbag 5, a curved shape of the distal portion 23 of the airbag 5 when deployed is achieved. Thereby a relatively large impact surface for the occupant is maintained, independent of the airbag depth.

(35) Hence, as previously mentioned, the external extension control member 7 is attached to an external surface of the airbag 5 such that when the airbag is deployed to a maximum depth the external extension control member 7 restricts full extension of the airbag 5, in particular it restricts full extension of the distal portion 23 of the airbag 5. In other words, the airbag 5 is restricted from reaching full extension by the external extension control member 7. To which depth d the airbag 5 is deployed, is controlled by the selected operative length l.sub.o of the external extension control member 7.

(36) As described herein, the external extension control member 7 has a selectable operative length l.sub.o, which controls the longitudinal extension of the airbag 5 in a deployed state. The external extension control member 7 may comprise a selectively releasable extension portion. By releasing the selectively releasable extension portion, the operative length l.sub.o of the external extension control member 7 is increased. The selectively releasable extension portion may form a fold or a loop of the external extension control member 7. The fold may be releasably attached, e.g. to the rest of the external extension control member 7. Upon releasing the selectively releasable extension portion, the operative length l.sub.o of the external extension control member 7 is increased by the selectively releasable extension portion. Thus the fold forms a selectively releasable extension portion of the external extension control member 7 that upon release will increase the length of the external extension control member 7.

(37) It is envisaged that the external extension control member 7 may comprise a plurality of selectively releasable extension portions, e.g. formed as folds of the external extension control member 7, as described above. Each selectively releasable extension portion may be individually releasably attached, e.g. by a tear seam. In this way, the selectable operative length l.sub.o of the external extension control member 7 may be provided.

(38) The external extension control member 7 may comprise or consist of a panel, a mesh or one or more straps or belts. The external extension control member 7 may extend along the complete or substantially complete transversal extension, i.e. the width W, of the airbag 5. This is in particular advantageous when the external extension control member 7 comprises or consists of a panel or a mesh.

(39) The external extension control member 7 may be of a material such as textile, plastics and or metal wire. The external extension control member 7 may also be of the same material as the airbag itself.

(40) The airbag arrangement as described herein comprises length selection means for selecting an operative length l.sub.o of the extension control member 7, as illustrated in FIGS. 1a and 1b and FIGS. 2a to 2c.

(41) The length selection means may comprise or consist of tear seam. This is advantageous since it enables an easy and simple way of carrying out a selection of operative length lo. Tear seams may constitute the releasable attachment of the selectively releasable extension portion. The tear seams may further be adapted to be opened, i.e. torn, by a pyrotechnical release. Thus, the tear seam may be connected to a pyrotechnical release, in a manner known to the skilled person. Activating the pyrotechnical release will open the tear seam which will no longer act as an attachment. By way of example, the pyrotechnical release may in turn be wired to a control unit. Upon receiving an electrical signal from the control unit, indicating a selection has been made to open a tear seam, the pyrotechnical release is activated and thus opens the tear seam.

(42) With reference to FIG. 4, a vehicle 1 comprising an interior portion 13 of the vehicle in front of a seated vehicle occupant and an airbag arrangement 3 is schematically illustrated. The vehicle 1 further comprises at least one sensor 35 for detecting a position of a seated vehicle occupant. The output of the sensor 35 is used as a basis to select the operative length l.sub.o of the external extension control member 7 as illustrated by the arrow in FIG. 4. This may involve the release of a selectively releasable extension portion, depending on the embodiment of the airbag arrangement 3. By way of example, a controller 37 is adapted to receive information from the sensor 35, and further is adapted to send a signal to the airbag arrangement 3 to actuate deployment of the airbag.

(43) As previously described the position of the vehicle occupant in relation to the interior portion may refer to if the vehicle occupant is seated in within a normal driving adjustment range, or, if the vehicle occupant is seated further to the rear than the normal driving adjustment range, for example as envisaged during AD. A normal driving adjustment range may in this context correspond to an adjustment range for a seat adapted for manual driving. It is anticipated that a more freely adjustable adjustment range is desirable, in particular more adjustable to the rear in order for a seated vehicle occupant to be in a reclined resting position. By way of example, when a vehicle is in AD-mode, or for example in a taxi or other passenger transportation vehicle with increased demands for comfortable resting positions for the seated occupant at least during some part of a journey.

(44) The position of the vehicle occupant may be detected using any kinds of detection means such as camera(s) and/or other types of sensors, such as radar, LIDAR, and seat location sensors. It is anticipated that, independent of means chosen for detection, it is anticipated that it is the distance 39 between the interior portion at a location in front of the seated vehicle occupant and the upper body region of the seated vehicle occupant that is of relevance in selecting the operative length l.sub.o of the extension control member 7, see FIGS. 1a and 1b. Noticeably, detecting the position of the seated vehicle occupant will directly or indirectly provide the distance 39 described above.

(45) With reference to FIG. 5 a method of deploying an airbag 5 of an airbag arrangement 5 according to the present invention will be described. The method comprises: 100: detecting a position of a seated vehicle occupant 17, 200: based on the detected position, selecting the operative length l.sub.o of the extension control member 7, 300: based on the selected operative length lo, deploying the airbag 5 controlled by the external extension control member 7.

(46) With reference to FIG. 5, step 200 of the method may comprise selecting the operative length l.sub.o by means of the length selection means.

(47) Further modifications of the invention within the scope of the appended claims are feasible. As such, the present invention should not be considered as limited by the embodiments and figures described herein. Rather, the full scope of the invention should be determined by the appended claims, with reference to the description and drawings.