JP2017206205A - Occupant protection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an occupant protection device which is enhanced in the constraint performance of an occupant, in the occupant protection device having a side airbag which is expanded and deployed to a seat front side from a side support part of a seat back.SOLUTION: In an occupant protection device 10, when a control ECU 52 determines that a side face collision is inevitable on the basis of a detection signal of a collision prediction sensor 50, firstly prescribed tension is made to act on a webbing 40 of a PSB 16, and an occupant P is moved to a proper position. After that, a side support part 22B is expanded to the inside of a vehicle width direction by expanding an inside airbag 32 which is accommodated in the side support part 22B of a seat back 22 at the side face collision, and the occupant P can be favorably constrained. Furthermore, after that, the expansion and deployment of a side airbag 30 to a front side of a vehicle from the side support part 22B is completed, and the occupant P who is located at the proper position can be favorably constrained.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an occupant protection device.

  Patent Document 1 below describes an occupant protection device that deploys a side airbag having a front back portion and a rear back portion on the front side of a side support of a seat back. The rear back portion of the side airbag is partitioned into a plurality of back portions in the vehicle width direction.

Japanese Patent Laying-Open No. 2015-030322

  In the side airbag device described in Patent Document 1, there is room for improvement in order to improve the restraint on the occupant by effectively generating a reaction force from the side airbag to the occupant.

  In view of the above-described facts, an object of the present invention is to provide an occupant protection device having an improved restraining performance with respect to an occupant in an occupant protection device including a side airbag that inflates and deploys from a side support portion of a seat back to a vehicle front side.

  According to a first aspect of the present invention, there is provided an occupant protection device according to a first aspect of the present invention, wherein the occupant protection device according to the first aspect of the present invention is provided with a side that can be deployed to the front side of the vehicle from a side support portion that bulges to the front side of the vehicle. An airbag, and an inside airbag that is provided inside the side support portion in the vehicle width direction and is inflated inside the side support portion to inflate the side support portion in the vehicle width direction inside the side support portion. When it is determined that a side collision is inevitable based on the detection result of the collision prediction sensor, based on the detection signal of the three-point seat belt device that forcibly applies a predetermined tension to the webbing and the detection signal of the collision prediction sensor When it is determined that a side collision is inevitable, first, a predetermined tension is forced on the webbing of the three-point seat belt device. It has reacted, then to complete the expansion of the inside airbag, and control means to complete the last inflation and deployment of the side air bag, to.

  In the first aspect of the present invention, for example, when an injurious vehicle approaches the side of the vehicle, the collision prediction sensor outputs a detection signal to the control means. When the control means determines that it is inevitable that the detected object collides with the side surface of the vehicle based on the detection signal, first, a predetermined tension is forcibly applied to the webbing on the three-point seat belt device. As a result, for example, an occupant who has been separated from the seatback and located at an inappropriate position in front of the vehicle is moved to an appropriate position where the occupant contacts the seatback. In this state, when the vehicle to be injured is subjected to a side collision, the control means inflates the inside airbag and causes the side support portion to bulge and deform inward in the vehicle width direction, thereby favorably restraining the occupant from the outside in the vehicle width direction. In other words, since the occupant positioned at an appropriate position overlaps the side support part and the inflated inside airbag in a side view of the vehicle, the occupant is well restrained by the side support part inflated and deformed in the vehicle width direction. The

  Subsequently, by ending the inflating and deploying of the side airbag, the passenger restrained at the proper position by the side support portion (inflated inside airbag) bulging inward in the vehicle width direction is expanded to the side from the side support portion. The air bag can be restrained well.

  In this way, when the control means determines that a side collision is inevitable, first, the three-point seat belt device forcibly applies a predetermined tension to the webbing so that an occupant in an inappropriate position with respect to the seat back is appropriately Moved to position. Therefore, a passenger | crew can be restrained favorably by expansion | swelling of an inside airbag.

  As described above, in the occupant protection device according to the present invention, since the occupant is moved to an appropriate position by the three-point seat belt device before the occupant is restrained inward in the vehicle width direction by the inside airbag, Performance can be improved.

In the occupant protection device according to one embodiment of the present invention, it is a side view showing a state in which the side airbag is inflated and deployed and the inside airbag is inflated. In the occupant protection device according to one embodiment of the present invention, it is a schematic plan cross-sectional view showing a state in which an approaching harmful vehicle is detected. In the occupant protection device according to one embodiment of the present invention, it is a schematic plan sectional view showing a state where the pre-crash seat belt device winds up the webbing before a side collision. In the occupant protection device according to one embodiment of the present invention, it is a schematic plan sectional view showing a state in which the inside airbag has been inflated. In the occupant protection device according to one embodiment of the present invention, it is a schematic plan sectional view showing a state in which the side airbag has been inflated and deployed. It is a flowchart which shows control of the passenger | crew protection apparatus which concerns on one Embodiment of this invention.

<Embodiment>
Hereinafter, an occupant protection device 10 according to an embodiment of the present invention will be described with reference to FIGS. It should be noted that an arrow FR, an arrow OUT, and an arrow UP that are appropriately shown in the drawings respectively indicate the front direction (traveling direction) of the vehicle, the outside in the vehicle width direction, and the upward direction of the vehicle. Hereinafter, when simply using the front / rear, left / right, and up / down directions, unless otherwise specified, the front / rear direction of the vehicle, the left / right direction of the vehicle left / right direction (vehicle width direction), and the up / down direction of the vehicle up / down direction are indicated. To do.

(Constitution)
As schematically shown in FIG. 2, the occupant protection device 10 according to the present embodiment includes a seat body 12, a side airbag device 14, and a three-point pre-crash seat belt device (hereinafter referred to as “PSB”) 16. It is constituted by. 2 to 5, only approximately half of the seat body 12 (a seat back 22 described later) in the sheet width direction is shown, but it is substantially symmetrical with respect to the center in the sheet width direction.

<Configuration of Sheet Body 12>
As shown in FIG. 1, a seat body 12 that is a vehicle seat includes a seat cushion 20 on which an occupant P is seated, a seat back 22 that is connected to a rear end portion of the seat cushion and supports the back of the occupant P, And a headrest 24 connected to the upper end of the seat back 22 and supporting the head of the occupant P.

  In the present embodiment, the front-rear direction, the left-right direction (width direction), and the up-down direction of the seat body 12 and the seat back 22 coincide with the front-rear direction, left-right direction (vehicle width direction), and up-down direction of the vehicle. 1 to 5, a collision test dummy P is seated on the seat body 12 instead of an actual occupant. The dummy P is, for example, an AM50 (50th percentile of an American adult male) of an international unified side impact dummy (WorldSID). Hereinafter, the dummy P is referred to as “occupant P” for the sake of easy understanding.

  As shown in FIGS. 2 to 5, the seat back 22 includes a center portion 22 </ b> A that extends in the vehicle width direction, and a side support portion 22 </ b> B as a side support portion that bulges toward the front side of the seat at both ends in the vehicle width direction. (Only the outside in the vehicle width direction is shown). The side support portion 22B ensures side support for the occupant P.

  1 and 2, the seat back 22 is provided in the outer side frame 26 provided in the side support portion 22B on the outer side in the vehicle width direction and in the side support portion on the inner side in the vehicle width direction of the seat back 22. Inner side frames (both not shown).

  The seat back 22 includes a seat skin 28 that covers a urethane pad (not shown) that covers the outer side frame 26 and the like.

<Configuration of Side Airbag Device 14>
As shown in FIGS. 1 to 3, the side airbag device 14 includes a side airbag 30, an inside airbag 32, and an inflator 34. The side airbag 30 and the inside airbag 32 are configured to inflate and deploy upon receiving gas supply from the inflator 34. 1 and 5 show the side airbag 30 in an inflated and deployed state and the inside airbag 32 in an inflated state.

  The side airbag 30 and the inside airbag 32 are normally stored in the side support portion 22B as shown in FIG. In the following description, the front / rear and up / down directions described with respect to the side airbag 30 indicate directions in the state in which the side airbag 30 is inflated and deployed, and substantially coincide with the front / rear and up / down directions of the seat back 22. ing.

  The inflator 34 is a so-called cylinder type inflator and is formed in a cylindrical shape. The inflator 34 is disposed on the outer side in the seat width direction (outer side in the vehicle width direction) of the side wall portion 36 </ b> A of the outer side frame 26 so that the axial direction is along the height direction of the seat back 22.

  The inflator 34 is electrically connected to a control ECU 52, which will be described later. The inflator 34 is configured to inflate and deploy the side airbag 30 and inflate the inside airbag 32 by a drive signal from the control ECU 52. is there.

  When the inflator 34 is activated, first, after the inflation of the inside airbag 32 is completed, the inflation and deployment of the side airbag 30 is completed.

  As shown in FIG. 2, the side airbag 30 is normally stored outside the outer side frame 26 in the seat width direction while being folded in a bellows shape so as to be folded in the seat width direction.

  The side airbag 30 receives gas supply from the inflator 34, cleaves the seat skin 28 of the side support portion 22B, inflates and deploys toward the front side of the seat, and is interposed between the occupant P and the vehicle side portion 36.

  In a state where the side airbag 30 is inflated and deployed, as shown in FIG. 1, the shoulder portion S to the waist portion L of the occupant P are restrained.

  As shown in FIG. 2, the inside airbag 32 is configured to be accommodated in the side support portion 22 </ b> B in a state of being spread in a planar shape, and the outside side frame 26 on the inner side in the seat width direction of the outside side frame 26. And a seat back pad (not shown).

  The inside airbag 32 is in the seat width direction with respect to the rear side of the chest C and abdomen B of the occupant P (the portion on the back side including the rear side of the ribs) in the side view of the seat shown in FIG. It arrange | positions so that it may oppose from the outer side. The inside airbag 32 is supplied with the gas ejected from the inflator 34 and expands in the side support portion 22B. The inflated inside airbag 32 receives a reaction force from the outer side frame 26 and inflates inward in the seat width direction (occupant P side) (see FIG. 4). As a result, as shown in FIG. 1, the rear side of the chest C and abdomen B of the occupant P is constrained to the inside airbag 32 via the seat back pad and the seat skin 28. The inside airbag 32 only needs to be able to restrain at least the rear side of the chest C (the rear side of the ribs).

<Configuration of PSB 16>
The PSB 16 includes a webbing 40 and a retractor 42 with a motor that can wind the webbing 40 with a predetermined tension. When it is determined from the detection signal of the side collision prediction sensor 50 that a side collision is inevitable by the control ECU 52 described later, the motor of the retractor with motor 42 is driven by so-called pre-crash control, and a predetermined tension is forced on the webbing 40. It is the structure which acts automatically.

<Configuration of Control ECU 52>
As shown in FIG. 2, the occupant protection device 10 is provided with a side collision prediction sensor 50 disposed on the vehicle side portion 36. The side collision prediction sensor 50 is, for example, a millimeter wave radar device, and detects a target such as an injurious vehicle 100 in the detection range A1 from the reflected radio wave, and outputs a detection signal to the control ECU 52 (not shown in FIG. 2). To do. Based on the detection signal of the side collision prediction sensor 50, the control ECU 52 determines whether or not the approaching target is a target that causes a collision, and determines whether or not a side collision is inevitable. To do.

  The control ECU 52 is electrically connected to the side airbag device 14 and the PSB 16, and outputs a drive signal to the PSB 16 and the side airbag device 14 when it is determined that a side collision is inevitable. is there. Specifically, the drive signal of the control ECU 52 is input to the retractor 42 with a motor of the PSB 16, and a predetermined tension is forcibly applied to the webbing 40 by driving the motor. Moreover, the drive signal of control ECU52 is input into the side airbag apparatus 14, and the inside airbag 32 and the side airbag 30 are inflate-deployed when the inflator 34 is started. However, from the relationship of gas flow, first, the inflation of the inside airbag 32 is completed, and then the inflation and deployment of the side airbag 30 is completed.

(Function and effect)
Next, operations and effects of the present embodiment will be described with reference to the schematic diagrams of FIGS. 2 to 5 and the flowchart of FIG. 6. 4 and 5, the inside airbag 32 is described as protruding outward from the seat back 22 for convenience of explanation, but actually the seat back 22 as described above. It expands inside.

  As shown in FIG. 2, when the injurious vehicle 100 enters the detection range A <b> 1 of the side collision prediction sensor 50, the control ECU 52 detects a detection signal from the side collision prediction sensor 50 (for example, detection by a reflected wave of a millimeter wave radar). Based on the signal, it is determined whether or not the target is a target that causes a collision (see step S10 in FIG. 6).

  Here, when it is determined that the target is a target that is the cause of the collision as in the case of the harming vehicle 100 (FIG. 6, YES in step S10), the control ECU 52 cannot avoid side collision. It is determined whether or not there is (see step S12 in FIG. 6).

  If it is determined that a side collision is unavoidable (FIG. 6, YES in step S12), the control ECU 52 outputs a drive signal to the PSB 16. As a result, as shown in FIG. 3, the motor of the retractor 42 with the motor of the PSB 16 is driven, and a predetermined tension is applied to the webbing 40. As a result, the position at which the back of the occupant P that has been separated from the seat back 22 and positioned forward (FIG. 3, double-dot chain line position) abuts the seat back 22 (see FIG. 3, solid line position), that is, the vehicle side surface It moves to the appropriate position (refer FIG. 1) which overlaps the side support part 22B expanded | swelled visually and the expanded inside airbag 32 (refer FIG. 6, step S14).

  Next, when a side collision is detected by the control ECU 52 based on a detection signal from a side collision sensor (not shown), the control ECU 52 outputs a drive signal to the side airbag device 14. Thereby, the inflator 34 of the side airbag device 14 is activated, and gas is supplied from the inflator 34 to the side airbag 30 and the inside airbag 32.

  At this time, as shown in FIG. 4, the inside airbag 32 receiving the reaction force of the outer side frame 26 is inflated inward in the seat width direction (see FIG. 6, step S16). As a result, the side support portion 22B bulges inward in the vehicle width direction, and the occupant P positioned at an appropriate position can be well restrained from the outer side in the vehicle width direction. In particular, since the reaction force of the outer side frame 26 located on the outer side in the vehicle width direction is used, the occupant P can be restrained effectively.

  By the way, as shown in FIG. 4, when the inside airbag 32 is completely inflated, the side airbag 30 is being inflated and deployed from the side support portion 22 </ b> B to the front of the seat. That is, in the state in which the occupant P is restrained from the outside in the vehicle width direction by the inflation of the inside airbag 32, the inside airbag 32 is restrained by completing the inflation and deployment of the side airbag 30 as shown in FIG. The occupant P can be restrained satisfactorily by the side airbag 30 (see FIG. 6, step S18).

  On the other hand, if the occupant P is located at an inappropriate position and the PSB 16 is not driven before the inside airbag 32 is inflated, as shown by a two-dot chain line in FIG. In order to restrain an occupant with the expanded side support portion 22B, there is still room for improvement. Further, as shown by a two-dot chain line in FIG. 5, there is still room for improvement in that the occupant P moves diagonally forward in the vehicle width direction due to the impact of the side collision and restrains the occupant with the side airbag 30. is there.

  Thus, in the occupant protection device 10 according to the present embodiment, as shown in FIG. 3, the occupant P is moved to an appropriate position by the pre-crash control of the PSB 16 before the side airbag device 14 is operated. The occupant P can be restrained well by the inflation of the airbag 32. As a result, the occupant P can be restrained favorably by the side airbag 30.

  As described above, according to the present embodiment, the occupant restraint performance is improved by operating the PSB 16 before the inside airbag 32 is inflated.

  In addition, the present invention can be implemented with various modifications without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to the above embodiment.

  In this embodiment, the side airbag 30 and the inside airbag 32 are inflated by the same inflator 34, but the side airbag 30 and the inside airbag 32 may be inflated by independent separate inflators. good. In this case, there is a merit that control of the timing of expansion becomes easy. Further, in a separate case, it is conceivable that the inside airbag 32 is inflated with a compressor or the like.

  In the present embodiment, the PSB 16 has been described. However, if a predetermined tension is applied to the webbing 40 before the side airbag device 14 is activated, a pretensioner or a buckle pretensioner may be used instead of the PSB 16. good.

10 occupant protection device 12 seat back 14 side airbag device 16 pre-crash seat belt (three-point seat belt device)
22B Side support part 30 Side airbag 32 Inside airbag 40 Webbing 50 Collision prediction sensor (collision prediction sensor)
52 Control ECU (control means)

Claims (1)

A side airbag provided so as to be deployable on the vehicle front side from a side support portion bulged on the vehicle front side on the vehicle width direction outer side of the seat back of the vehicle seat;
Inside the side support portion, an inside airbag that is provided on the inner side in the vehicle width direction than the side airbag, inflates inside the side support portion and inflates the side support portion toward the inner side in the vehicle width direction, and
When it is determined that side collision is inevitable based on the detection result of the collision prediction sensor, a three-point seat belt device that forcibly applies a predetermined tension to the webbing;
When it is determined that a side collision is inevitable based on the detection signal of the collision prediction sensor, first, a predetermined tension is forcibly applied to the webbing of the three-point seat belt device, and then the inflation of the inside airbag is performed. And finally, the control means for completing the inflation and deployment of the side airbag,
An occupant protection device.

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