JP2008279977A - Occupant restraint system for rear seat, method of deploying airbag, and vehicle having occupant restraint system for rear seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an occupant restraint system for a rear seat capable of surely restraining a rear seat occupant while minimizing the impact on the rear seat occupant. <P>SOLUTION: This occupant restraint system comprises a collision detection sensor 3 for detecting the frontal collision of a vehicle, a front seat position detection sensor 5 for detecting the position of a front seat 4, an airbag 11 for restraining the occupant 8 at the rear seat comprising an integral airbag formed by connecting a first airbag 18A and second airbag 18B of different sizes, and a control device 10 for controlling a rear seat belt 21 and the deployment of the airbag 11. In the occupant restraint system, after the airbag 11 is brought into contact with the front seat 4 immediately after the airbag 11 is deployed, the occupant 8 is restrained to the rear seat 9 for protecting the occupant from the impact. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention has a rear-seat occupant restraint device, an airbag deployment method, and a rear-seat occupant restraint device that can restrain the occupant to the rear seat reliably while suppressing impact on the rear seat occupant as much as possible. Regarding vehicles.

  If a passenger is not seated in the front passenger seat at the time of a frontal collision of the vehicle, the front passenger seat is moved to the front of the vehicle to ensure a wide space between the passenger seat back and the rear passenger seat behind it. However, an airbag device for a rear seat occupant has been proposed in which the airbag is deployed over the entire body of the rear seat occupant (see, for example, Patent Document 1).

According to this airbag device, the entire body of the occupant can be reliably restrained without being affected by the physique of the rear seat occupant or the sitting posture.
Japanese Patent No. 2894194

  However, in the airbag device described in Patent Document 1, if the front seat position is adjusted for the rear seat occupant, the comfort of the front seat occupant may be reduced. It is difficult to satisfy both performances at once.

  Accordingly, the present invention provides a rear-seat occupant restraint device, an airbag deployment method, and a vehicle having a rear-seat occupant restraint device that can simultaneously satisfy the required performance of the front seat and the rear seat. .

  The rear seat occupant restraint device according to the present invention includes at least two air signals based on a signal from a collision detection unit that detects a frontal collision of a vehicle and a signal from a front seat position detection unit that detects the position of the front seat. Controls the unfolding state of the back.

  According to the rear seat occupant restraint device of the present invention, the restraint of the rear seat occupant can be controlled according to the state of the front seat at the time of a vehicle collision, so that the required performance of the front seat and the rear seat can be satisfied at the same time. it can.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

“First Embodiment”
FIG. 1 is a layout diagram of detectors and control units in the first embodiment, FIG. 2 is a vehicle mounting diagram of a passenger restraint device for rear seats in the first embodiment, and FIG. 3 is for rear seats in the first embodiment. FIG. 4 is a cross-sectional view showing an example in which an occupant restraint device is provided on a door, FIG. 4 is a view showing a state in which gas is injected into an airbag main body in the first embodiment, and FIG. FIG. 6 is a diagram showing the relationship between vehicle body deceleration and contact force by the rear seat occupant restraint device in the first embodiment, and FIG. 7 is a rear seat occupant restraint device in the first embodiment. FIG. 8 is a diagram showing the relationship between time and contact force according to FIG. 8, FIG. 8 is an airbag operation diagram by the rear seat occupant restraint device of the comparative example, and FIG. 9 is an airbag operation diagram by the rear seat occupant restraint device in the first embodiment. FIG. 10 is for the rear seat in the first embodiment. Is a flowchart showing the operation of the personnel restraint system.

  In the engine room 2 of the vehicle 1, as shown in FIG. 1, a collision detection sensor 3 that is a collision detection means for detecting a frontal collision is attached. Also, a front seat position detection sensor 5 that is a front seat position detecting means for detecting the position of the front seat 4 is attached near the lower seat surface of the front seat 4 of the vehicle 1. A camera 6 that captures the position of the front seat 4 is attached to the roof of the vehicle. A control device 10 is attached to the floor 7. The seat belt is an occupant restraining means for restraining the occupant 8 to the rear seat 9 and the control device 10 is a control means for controlling the deployment of the airbag.

  As shown in FIG. 2, the airbag 11 for restraining the occupant 8 seated on the rear seat 9 to the seat is disposed on the rear side door 12 and receives a predetermined impact force at the time of a frontal collision, and receives the predetermined impact force. Is deployed between the occupant 8 seated on the front seat 4 and the rear seat 9 (in front of the occupant 8) to protect the occupant 8 from impact.

  As shown in FIG. 3, the airbag 11 is disposed inside the door trim 16 in the cross section of the door outer 13, the door inner 14, the sill 15, and the floor 7 when viewed from the vehicle front-rear direction. The airbag 11 of the present embodiment includes an inflator 17, an airbag main body 18 that is inflated by a gas fed from the inflator 17, and a deployment direction control plate 19 that is a deployment direction control means for controlling the deployment direction of the airbag body 18. , Is composed of.

  The inflator 17 is disposed between the door outer 13 and the door inner 14. The airbag main body 18 and the deployment direction control plate 19 are both disposed in a space formed between the door inner 14 and the door trim 16. When gas is blown from the inflator 17 into the airbag body 18, the deployment direction control plate 19 is opened so that the opening angle becomes a predetermined angle in response to an instruction from the control device 10, and the deployment direction of the airbag 11 is controlled. .

  As shown in FIG. 4, the airbag main body 18 is composed of an integrated airbag in which the first airbag 18 </ b> A and the second airbag 18 </ b> B having different sizes are connected when gas is injected into the interior by the inflator 17 and inflated. The airbag main body 18 is composed of one bag, but two airbag main bodies 18A and 18B having different sizes depending on a belt-like body (tether) 20 which is a displacement restraining means for restraining displacement when the airbag is inflated. It becomes.

  The belt-like body 20 is wound around a position near the left or right from the approximate center of the airbag main body 18, and forms a constricted portion in the expanded airbag main body 18. The belt-like body 20 restrains a displacement that tends to swell when gas is injected into the airbag body 18 and prevents the part from swelling. As a result, the airbag 11 has two airbags of the first airbag 18A and the second airbag 18B, which are apparently different in size from both sides of the belt-shaped body 20 and are gradually inflated. Of these first airbag 18A and second airbag 18B, as shown in FIG. 5, the side of the rear seat seat belt (shoulder belt) 21 that does not restrain the shoulder of the occupant 8 is made larger than the other. In this embodiment, the size of the second airbag 18B is larger than that of the first airbag 18A disposed on the rear side door 12 side.

  The belt-like body 20 has a notch 22 that is a fragile portion for breaking the belt-like body 20 when the airbag body 18 has a size that is inflated (when the inside of the airbag is at a predetermined pressure). Is formed. By forming the notch 22, the band-like body 20 is broken from this portion, and the first airbag 18 </ b> A and the second airbag 18 </ b> B become one bag-like airbag at the end of deployment.

  The airbag 11, which is a rear-seat occupant restraint device including the deployment direction control plate 19, detects a frontal collision of the vehicle 1 when the collision detection sensor 3 detects that the control device 10 issues a command to deploy the airbag 11. Gas is injected from the inflator 17 into the airbag main body 18. When the gas is injected into the airbag main body 18, as shown in FIG. 5A, the airbag main body 18 is restrained by the band-shaped body 20, so that the portion where the band-shaped body 20 is provided has a hollow shape. At the same time, the first airbag 18A and the second airbag 18B gradually inflate as both sides thereof inflate.

  At this time, the deployment direction control plate 19 is projected from the rear side door 12 into the vehicle in response to a command from the control device 10. The airbag main body 18 that has started to expand is deployed toward the seat back 4 a of the front seat 4 by the deployment direction control plate 19. The second airbag 18B on the front end side is guided by the deployment direction control plate 19 and comes into contact with the seat back 4a of the front seat 4.

  On the other hand, when the deceleration of the vehicle 1 is sensed, the rear seat seat belt 21 restrains the right half of the occupant 8 seated on the rear seat 9 as shown in FIG. Thereafter, as shown in FIG. 5B, the second airbag 18B further inflated contacts the left half that is not restrained by the rear seat belt 21, and restrains the left half of the occupant 8. Thereby, the contact with the side frame 23 and the passenger | crew 8 provided in the vehicle width direction both sides of the front seat 4 can be prevented as much as possible.

  As the collision progresses, the contact force between the airbag main body 18 and the occupant 8 increases, and when a predetermined internal pressure is reached, the strip 20 is broken from the notch 22 as shown in FIG. . When the belt-like body 20 is broken, the first airbag 18A and the second airbag 18B become the airbag 11 having a single bag shape. Then, the airbag 11 is swelled to the maximum extent, and the entire body of the occupant 8 is restrained by the rear seat 9 by the airbag body 18, and the occupant 8 is protected from an impact at the time of a vehicle collision.

  FIG. 6 shows the relationship between the deceleration response of the vehicle body and the contact force with the airbag (contact force with A / B). The deceleration generated by the deformation of the engine room 2 is a section from t0 to t2, and the deceleration generated by the cabin deformation is after t2. The airbag made of one bag used as a comparative example for the airbag 11 of the present embodiment is in direct contact with the front surface of the occupant so that the contact force gradually increases and becomes a peak response (broken line) Characteristics).

  However, in the rear seat occupant restraint device of the present embodiment, the airbag 11 first contacts the front seat 4 and is deployed forward of the occupant 8, and then is not restrained by the rear seat seat belt 21. The entire area of the front surface of the occupant 8 is then restrained by the airbag 11. Thereby, in this embodiment, it restrains so that the relatively weak part of the passenger | crew 8 may be avoided as much as possible at the time of a vehicle collision, and it can restrain reliably, suppressing the impact to the rear-seat passenger | crew 8 as much as possible.

  7 to 9 show analysis verification results by the rear seat occupant restraint device of the present embodiment. FIG. 7 shows a comparison of the contact force between the airbag of the comparative example and the airbag of the present embodiment (this example), FIG. 8 is an airbag operation diagram of the comparative example, and FIG. 9 is an airbag operation of the present embodiment. FIG.

  In the airbag of the comparative example, the occupant 8 is fully restrained at the same time as the airbag 11 is deployed. However, in the airbag of this embodiment, the unrestrained side by the rear seat belt 21 of the occupant 8 and the first airbag. After the contact with 18A, the restraint side by the rear seat belt 21 and the second airbag 18B come into contact. For this reason, the airbag of the present embodiment has a contact force that is about 30% lower than that of the comparative example. As a result, regardless of the position of the front seat 4, the restraining performance of the occupant 8 with respect to the rear seat 9 can be ensured.

  FIG. 10 shows a flowchart representing the operation of the rear seat occupant restraint device of this embodiment. This flowchart starts when the front seat position detection sensor 5 captures the position information of the front seat 4 in the process of step S1. At this time, the position information of the front seat 4 is imaged by the camera 6 provided in the vehicle.

  In the process of step S2, the collision detection sensor 3 is caused to sense. In the process of step S3, the collision detection sensor 3 detects a frontal collision of the vehicle 1 and determines whether or not a collision has occurred. If there is no collision (NO), the process returns to step S2, and sensing by the collision detection sensor 3 is performed again. If there is a collision (YES), the process proceeds to step S4, and it is determined whether airbag development and gas injection control are necessary, restraint by the seat belt is necessary, or both are necessary.

  If it is a collision that requires airbag deployment and seat belt restraint (YES), first, the pretension of the rear seat belt 21 is activated in the process of step S5, and then the airbag is deployed in the process of step S6. In step S7, the funnel limit of the rear seat belt 21 is activated. When the airbag is deployed, the control device 10 controls the amount of gas injected into the inflator 17. On the other hand, when the airbag development is not required (NO), the pre-seat of the rear seat belt 21 is operated in the process of step S5, and then the process of step S7 is performed.

  As described above, according to the rear seat occupant restraint device of the present embodiment, immediately after the airbag 11 is deployed, the airbag 11 is brought into contact with the front seat 4 and then the occupant 8 is moved to the rear seat 9. By providing the deployment direction control plate 19 for deploying the airbag 11 so as to restrain the passenger, the occupant 8 can be restrained in a state where the impact during the airbag deployment is reduced as much as possible. Therefore, it is possible to reliably restrain the occupant 8 to the rear seat 9 while suppressing the impact on the occupant 8 in the rear seat as much as possible. In addition, regardless of the seat position of the front seat 4, it is possible to simultaneously satisfy the restraining performance of the front seat and the rear seat.

  Further, according to the rear seat occupant restraint device of the present embodiment, the first airbag 18A and the second airbag 18B having different sizes are used in the initial stage of the collision, and each airbag has one airbag 11 at the end of deployment. Therefore, the occupant 8 can be restrained step by step.

  Further, according to the rear seat occupant restraint device of the present embodiment, the displacement restraint means is provided between the first airbag 18A and the second airbag 18B. It can be restrained from around the passenger shoulder.

  Further, according to the rear seat occupant restraint device of the present embodiment, the airbag on the side of the first airbag 18A and the second airbag 18B that does not restrain the shoulder of the occupant 8 with the rear seat seat belt 21 is used from the other side. Therefore, by restraining the side that is not restrained by the rear seat belt 21 first, restraint that maintains the balance of the upper body of the occupant 8 can be performed.

  Further, according to the rear seat occupant restraint device of the present embodiment, when the displacement restraining means is the belt-like body 20 having the weakened portion, the weakened portion (notch portion) when the inside of the airbag 11 becomes a predetermined pressure. 22), the belt-like body 20 is broken, so that the internal pressure rises as the deformation of the airbag 11 constraining the vicinity of both shoulder portions of the occupant 8 progresses, and the belt-like body 20 near the center breaks from the fragile portion at a predetermined pressure. The entire body of the occupant 8 can be stably restrained.

  Further, according to the rear seat occupant restraint device of the present embodiment, the vehicle 1 senses the deceleration and controls the position detection of the front seat 4 and the deployment of the airbag 11, so that the degree of collision at the time of vehicle collision Moreover, it can restrain appropriately according to the seat position of front seat crew member 8.

  Further, according to the rear seat occupant restraint device of the present embodiment, the front seat position detection sensor 5 is used to detect the front seat position, and the camera 6 that images the seat position of the front seat 4 is used. Therefore, the front seat position can be detected reliably and with high accuracy.

  Further, according to the rear seat occupant restraint device of the first embodiment, it is effective not only for frontal collision but also for side collision.

“Second Embodiment”
FIG. 11 is a flowchart showing the operation of the rear seat occupant restraint device in the second embodiment, and FIG. 12 is a view showing an example in which the rear seat occupant restraint device in the second embodiment is provided in the center pillar.

  In the second embodiment, as shown in FIG. 12, the front seat 4 is located near the side of the front side door 24, the airbag 11 is installed inside the center pillar 25, and near the side of the rear side door 12. The rear seat occupant 8 is seated. In the second embodiment, the airbag 11 built in the center pillar 25 is developed when the position of the front seat 4 is in front of the center pillar 25 (area G1), and in the case of the rear (area G2). Do not expand.

  As shown in the flowchart of FIG. 11, the operation of the airbag 11 in this embodiment starts when the front seat position detection sensor 5 captures the position information of the front seat 4 in step S10. At this time, the position information of the front seat 4 is imaged by the camera 6 provided in the vehicle.

  When the position of the front seat 4 is in the area G1 ahead of the center pillar 25, the collision detection sensor 3 is sensed in the process of step S11. In step S12, the collision detection sensor 3 detects a frontal collision of the vehicle 1 and determines whether or not a collision has occurred. If there is no collision (NO), the process returns to step S11, and sensing by the collision detection sensor 3 is performed again. If there is a collision (YES), the process proceeds to step S13, and it is determined whether airbag expansion and gas injection control are necessary, restraint by the seat belt is necessary, or both are necessary.

  If the collision requires airbag deployment and seat belt restraint (YES), first, the pretension of the rear seat belt 21 is actuated in step S14, and then the airbag is deployed in step S15. In step S16, the funnel limit of the rear seat belt 21 is activated. When the airbag is deployed, the control device 10 controls the amount of gas injected into the inflator 17. On the other hand, when the airbag development is not required (NO), the pre-seat of the rear seat belt 21 is operated in the process of step S14, and then the process of step S16 is performed.

  When the position of the front seat 4 is in the area G2 behind the center pillar 25, the collision detection sensor 3 is sensed in the process of step S17. In step S18, the collision detection sensor 3 detects a frontal collision of the vehicle 1 and determines whether or not a collision has occurred. If there is no collision (NO), the process returns to step S17, and sensing by the collision detection sensor 3 is performed again. If there is a collision (YES), the process proceeds to step S19, and it is determined whether restraint by the seat belt is necessary.

  If the restraint by the seat belt is not necessary (NO), the process returns to step S18. On the other hand, if the restraint by the seat belt is necessary (YES), the process proceeds to step S20, the pretension of the rear seat belt 21 is operated, and then the funnel limit of the rear seat seat belt 21 is set in the process of step S21. Operate.

  According to the rear seat occupant restraint device of the second embodiment, when the airbag 11 built in the center pillar 25 is set to a position where the front seat position overlaps the center pillar 25 (rear side of the center pillar). Since the airbag 11 is controlled not to be deployed in the area G2), the reliability of the rear-seat occupant restraint device can be obtained by making an appropriate determination when restraint is difficult.

“Third Embodiment”
FIG. 13 is a flowchart showing the operation of the rear seat occupant restraint device in the third embodiment, and FIG. 14 is a view showing an example in which the rear seat occupant restraint device in the third embodiment is provided on the rear side door.

  In the third embodiment, the front seat 4 is located near the side of the front side door 24 and the center pillar 25, and the airbag main body 18, the inflator 17, and the deployment direction control plate 19 are installed inside the rear side door 12. The rear seat occupant 8 is seated on a rear seat 9 disposed near the side of the rear side door 12.

  In the third embodiment, in the respective cases of R1 when the collision direction is the front right side as viewed from the occupant, F1 when the front is in front, and L1 when the front is the left front, the airbag 11 is deployed in the case of R1. In the case of the right portion A, F1 of the front seat 4, the deployment position of the airbag 11 is the central portion B of the front seat 4, and in the case of L1, the deployment location of the airbag 11 is the left portion C. The direction control plate 19 is operated and controlled, and the gas injection amount and speed of the airbag are controlled.

  As shown in the flowchart of FIG. 13, the operation of the airbag 11 in this embodiment starts when the front seat position detection sensor 5 captures the position information of the front seat 4 in step S30. At this time, the position information of the front seat 4 is imaged by the camera 6 provided in the vehicle.

  In the process of step S31, the collision detection sensor 3 is caused to sense. In step S32, the collision detection sensor 3 detects a frontal collision of the vehicle 1 and determines whether or not a collision has occurred. If there is no collision (NO), the process returns to step S31, and sensing by the collision detection sensor 3 is performed again. When there is a collision (YES), each process is executed according to the collision direction.

  When the collision direction is the front side on the left side, the process proceeds to step S33, and it is determined whether air bag deployment and gas injection control are necessary, restraint by the seat belt is necessary, or both are necessary. To do. If the restraint by the seat belt is necessary and the airbag needs to be deployed (YES), the process proceeds to step S34, the pretension of the rear seat belt 21 is activated, and the airbag 11 is deployed in the process of step S35. Let At this time, the control device 10 operates the deployment direction control plate 19 to a position 19A that is the smallest opening angle in FIG. Thus, the airbag 11 is deployed in the right portion A of the front seat 4 with the deployment direction determined by the deployment direction control plate 19. Thereafter, the funnel limit of the rear seat belt 21 is actuated in step S36.

  When the collision direction is directly in front, F1 proceeds to the process of step S37, and determines whether air bag deployment and gas injection control are necessary, restraint by the seat belt is necessary, or both are necessary. If the restraint by the seat belt is necessary and the airbag needs to be deployed (YES), the process proceeds to step S38, the pretension of the rear seat belt 21 is operated, and the airbag 11 is deployed by the process of step S39. Let

  At this time, the control device 10 operates the deployment direction control plate 19 to a position 19B having an intermediate opening angle in FIG. In this way, the airbag 11 is deployed in the central portion B of the front seat 4 with its deployment direction determined by the deployment direction control plate 19. When the airbag is deployed, the control device 10 issues an appropriate instruction to the inflator 17 to control the gas injection amount. Thereafter, the funnel limit of the rear seat belt 21 is activated in the process of step S40.

  When the collision direction is the front side on the right side, R1 proceeds to the process of step S41, and determines whether air bag deployment and gas injection control are necessary, restraint by the seat belt, or both are necessary. To do. If the restraint by the seat belt is necessary and the airbag needs to be deployed (YES), the process proceeds to step S42, the pretension of the rear seat belt 21 is activated, and the airbag 11 is deployed by the process of step S43. Let me. At this time, the control device 10 operates the deployment direction control plate 19 to a position 19C that is the largest opening angle in FIG. As a result, the airbag 11 is deployed in the left-side portion C of the front seat 4 with its deployment direction determined by the deployment direction control plate 19. Thereafter, the funnel limit of the rear seat belt 21 is activated in the process of step S40.

  According to the rear seat occupant restraint device of the third embodiment, the airbag 11 is controlled according to the collision direction and the degree of collision by controlling the airbag deployment direction and the gas injection amount in the airbag according to the collision direction. The deployment direction control and the gas injection amount control are appropriately performed, and appropriate restraint can be performed.

“Fourth Embodiment”
FIG. 15A is an enlarged perspective view of a main part showing an example in which the rear seat occupant restraint device in the fourth embodiment is provided inside the sill, and FIG. 15B is a rear seat occupant in the fourth embodiment. It is a principal part expansion perspective view which shows the example which provided the restraint apparatus inside the center pillar outer and the center pillar inner.

  In FIG. 15A, the airbag main body 18, the inflator 17, and the deployment direction control plate 19 are installed inside the sill 15. In FIG. 15B, the airbag main body 18, the inflator 17, the attachment member 28, and the deployment direction control plate 19 are installed inside the center pillar outer 26 and the center pillar inner 27.

  Even when the airbag 11 is arranged inside the sill 15 or inside the center pillar outer 26 and the center pillar inner 27, the same effect as that of the above-described embodiment can be obtained.

“Fifth Embodiment”
FIG. 16 is a view showing an example in which a plurality of belt-like bodies having fragile portions are provided on the airbag in the fifth embodiment.

  In the fifth embodiment, a plurality of belt-like bodies 20 are provided at positions closer to the left or right side from the substantially center of the airbag main body 18, and are broken from the notch portions 22 that are weak portions formed in the belt-like body 20. It is comprised as follows.

  Unlike the long belt-like body 20 shown in FIG. 4 of the first embodiment, the belt-like body 20 has a short length, and the air bag body 18 has a plurality of the air-bags by shifting the mounting position around the airbag body 18. The entire back body is wrapped around.

  According to the airbag 11, when gas is injected from the inflator 17 into the inside, the portions wound by the plurality of strips 20 are constrained to form a hollow shape, and the portions on both sides thereof are swollen and sized. The first airbag 18A and the second airbag 18B are of different sizes. When the pressure inside the air bag body 18 reaches a predetermined pressure, the band-like body 20 is broken from the notch to release the restraining force, and the first air bag 18A and the second air bag 18B are one air bag. 11 to protect the occupant 8 from collision.

“Sixth Embodiment”
FIG. 17 is a view showing an example in which a string-like body that forms a constricted portion is provided on the airbag in the sixth embodiment.

  In the sixth embodiment, as shown in FIG. 17, an example is shown in which a constricted portion is formed by tying with a string-like body 29 at a position closer to the left or right side from the approximate center of the airbag body 18. The string-like body 29 can be broken or broken by a predetermined pressure by the gas injected into the airbag main body 18.

  According to the airbag 11, when gas is injected from the inflator 17 into the inside, the portion wound by the string-like body 29 is constrained to form a hollow shape, and the portions on both sides thereof swell and have different sizes. The first airbag 18A and the second airbag 18B are formed. When the pressure inside the airbag main body 18 reaches a predetermined pressure, the knots of the string-like body 29 are broken or broken, and the restraining force is released. The first airbag 18A and the second airbag 18B are one air bag. The back 11 can protect the occupant 8 from collision.

“Seventh Embodiment”
FIG. 18 is a view showing an example in which a partition member in which a hole for forming a constricted portion is formed in the airbag main body in the seventh embodiment.

  In the seventh embodiment, as shown in FIG. 18, a partition member 31 is formed in which a hole portion 30 is formed to partition the internal space at a position closer to the left or right than the approximate center of the airbag body 18. This is an example of forming a part. The partition member 31 is formed such that the gas injected from the inflator 17 flows from the first airbag 18A to the second airbag 18 so that the gas injection is not divided by forming the hole 30 at the center position. Yes. Further, the partition member 31 is configured to be broken from the joint portion between the partition member 31 and the airbag body 18 when the gas injected into the airbag body 18 reaches a predetermined pressure. Of course, at that time, the airbag main body 18 is not torn.

  According to the airbag 11, when the gas is injected from the inflator 17, the portion where the partition member 31 is provided is restrained, so that the portions on both sides of the constriction swell and have different sizes. It becomes the first airbag 18A and the second airbag 18B. At this time, since the hole 30 is formed at the center of the partition member 31, gas flows from the first airbag 18A to the second airbag 18B through the hole 30. When the inside of the airbag main body 18 reaches a predetermined pressure, the coupling portion between the partition member 31 and the airbag main body 18 is broken and the restraining force is released, and the first airbag 18A and the second airbag 18B are integrated with each other. The two airbags 11 can protect the occupant 8 from collision.

It is an arrangement plan of a detector and a control unit in the first embodiment. FIG. 2 is a vehicle mounting diagram of the rear seat occupant restraint device according to the first embodiment. FIG. 3 is a cross-sectional view showing an example in which the rear seat occupant restraint device according to the first embodiment is provided on a door. FIG. 4 is a view showing a state in which gas is injected into the airbag main body in the first embodiment. FIG. 5 is an operation diagram of the rear seat occupant restraint device in the first embodiment. FIG. 6 is a diagram illustrating a relationship between vehicle body deceleration and contact force by the rear seat occupant restraint device according to the first embodiment. FIG. 7 is a diagram illustrating a relationship between time and contact force by the rear seat occupant restraint device according to the first embodiment. FIG. 8 is an air bag operation diagram of the comparative example rear seat occupant restraint device. FIG. 9 is an airbag operation diagram of the rear seat occupant restraint device according to the first embodiment. FIG. 10 is a flowchart showing the operation of the rear seat occupant restraint device in the first embodiment. FIG. 11 is a flowchart showing the operation of the rear seat occupant restraint device in the second embodiment. FIG. 12 is a diagram showing an example in which the rear seat occupant restraint device according to the second embodiment is provided on the center pillar. FIG. 13 is a flowchart showing the operation of the rear seat occupant restraint device in the third embodiment. FIG. 14 is a diagram showing an example in which the rear seat occupant restraint device according to the third embodiment is provided on the rear side door. FIG. 15A is an enlarged perspective view of a main part showing an example in which the rear seat occupant restraint device in the fourth embodiment is provided inside the sill, and FIG. 15B is a rear seat occupant in the fourth embodiment. It is a principal part expansion perspective view which shows the example which provided the restraint apparatus inside the center pillar outer and the center pillar inner. FIG. 16 is a view showing an example in which a plurality of belt-like bodies having fragile portions are provided on the airbag in the fifth embodiment. FIG. 17 is a view showing an example in which a string-like body that forms a constricted portion is provided on the airbag in the sixth embodiment. FIG. 18 is a view showing an example in which a partition member in which a hole for forming a constricted portion is formed in the airbag main body in the seventh embodiment.

Explanation of symbols

3 ... Collision detection sensor (collision detection means)
4. Front seat 5: Front seat position detection sensor (front seat position detection means)
6 ... Camera 8 ... Crew 9 ... Rear seat 10 ... Control device (control means)
11 ... Airbag 12 ... Rear side door (door)
DESCRIPTION OF SYMBOLS 15 ... Sill 17 ... Inflator 18 ... Airbag main body 19 ... Deployment direction control board (deployment direction control means)
20 ... Band-shaped body (displacement restraining means)
21 ... Rear seat belt (seat belt)
22 ... Notch (fragile part)
25 ... center pillar 29 ... string-like body (displacement restraining means)
30 ... hole 31 ... partition member (displacement restraining means)

Claims (15)

A collision detection means for detecting a frontal collision of the vehicle;
Front seat position detecting means for detecting the position of the front seat;
Occupant restraint means for restraining a rear seat occupant comprising at least two airbags;
Control means for controlling the deployment of the seat belt and the airbag,
The control means controls the deployed state of the at least two airbags according to signals from the collision detection means and the front seat position detection means. The rear seat occupant restraint device according to claim 1,
The control means includes a deployment direction control means for deploying the airbag so that the occupant is restrained by the rear seat after the airbag is brought into contact with the vehicle body or the front seat immediately after the airbag is deployed. An occupant restraint device for rear seats. The occupant restraint device for a rear seat according to claim 1 or 2,
The two airbags of the occupant restraint means comprise an integrated airbag in which a first airbag and a second airbag having different sizes are connected. A rear seat occupant restraint device according to claim 3,
Displacement restraining means for restraining displacement between the first airbag and the second airbag is provided. A rear seat occupant restraint device according to claim 3 or claim 4,
Of the first airbag section and the second airbag section, the airbag section on the side where the seat belt does not restrain the occupant's shoulder is made larger than the other. The rear seat occupant restraint device according to claim 4 or 5,
The displacement restraining means is composed of a belt-like body having a fragile portion that is wound between the first airbag and the second airbag to form a constricted portion, and when the inside of the airbag is at a predetermined pressure. The rear-seat occupant restraint device, wherein the belt-like body is broken from the fragile portion to release restraint force. The rear seat occupant restraint device according to claim 4 or 5,
The displacement restraining means is formed of a string-like body that is wound between the first airbag and the second airbag to form a constricted portion. When the inside of the airbag becomes a predetermined pressure, the string-like body is Rear seat occupant restraint device that breaks and releases restraint force. The rear seat occupant restraint device according to claim 4 or 5,
The displacement restraining means comprises a partition member provided in the airbag and forming a constricted portion between the first airbag and the second airbag, and a hole is formed in the airbag. The rear seat occupant restraint device is characterized in that when the predetermined pressure is reached, the coupling portion between the partition member and the airbag breaks to release the restraint force. A rear seat occupant restraint device according to any one of claims 1 to 8,
The control means controls the airbag deployment direction and the amount of gas injected into the airbag according to the collision direction and the front seat position. The rear seat occupant restraint device according to claim 2,
The deployment direction control means is incorporated in a door, a side sill or a center pillar. The rear seat occupant restraint device according to claim 10,
The rear seat occupant restraint device, wherein the control means does not deploy the air bag built in the center pillar when the front seat position overlaps the center pillar. The occupant restraint device for a rear seat according to any one of claims 1 to 11,
Means for detecting vehicle deceleration,
The control means controls the correction of the detection position of the front seat and the deployment of the airbag according to the deceleration of the vehicle. The occupant restraint device for a rear seat according to any one of claims 1 to 12,
The front seat position detecting means includes a displacement sensor that detects a displacement of the front seat position and a camera that images the seat position. When restraining the occupant in the rear seat to the rear seat by deploying an integrated airbag connecting the first airbag and the second airbag of different sizes,
An airbag deployment method, comprising: controlling a deployment state of the airbag by a signal from a collision detection unit that detects a frontal collision of a vehicle and a front seat position detection unit that detects a position of a front seat. In a vehicle having a rear seat occupant restraint device that deploys an airbag and restrains a rear seat occupant to the rear seat,
A collision detection means for detecting a frontal collision of the vehicle;
Front seat position detecting means for detecting the position of the front seat;
An occupant restraining means comprising at least two airbags;
A vehicle having a rear-seat occupant restraint device, comprising: a control unit that controls a deployment state of the at least two airbags according to signals from the collision detection unit and the front seat position detection unit.

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