JP7165085B2 - passenger protection device - Google Patents

Description

The present invention relates to an occupant protection system.

2. Description of the Related Art Vehicles such as automobiles are equipped with airbag devices as occupant protection devices in order to protect occupants from collisions and the like.
This airbag device generally comprises an impact sensor, an inflator, an airbag, a control device, and the like. When the impact sensor detects an impact due to a frontal collision or the like, the airbag device outputs a detection signal to the control device, the control device sends an operation signal to the inflator, and the inflator generates gas and sends it to the airbag. . The airbag is instantly inflated by the gas from the inflator and deployed in front of the occupant. As a result, the airbag catches the occupant's body moving forward due to the impact due to the internal gas pressure, and contracts while absorbing the kinetic energy. In this way, the airbag mitigates the sudden forward movement of the occupant due to the impact of the collision, such as in a frontal collision of an automobile, thereby ensuring the safety of the occupant.

In order to sufficiently protect the occupant, such a conventional airbag system uses a combination of an airbag that inflates in front of the upper body of the occupant and a knee bag that inflates in front of the legs of the occupant. It is widely known, and in Patent Document 1, the upper end of the inflated kneebag is positioned 50 mm or more above the lower end of the inflated airbag, so that the upper end of the inflated kneebag and the lower end of the inflated airbag are aligned. are overlapped in the longitudinal direction of the vehicle.
As a result, the lower end of the airbag can be inserted between the upper end of the inflated kneebag and the occupant, and even if the lower end of the airbag is pressed by the occupant, the airbag can be prevented from retracting, thereby preventing the occupant from moving back. It is possible to prevent the waist from moving forward.

JP-A-2003-34215

According to Patent Document 1, although it is possible to prevent the waist of the occupant from moving forward, the occupant's head and chest cannot be sufficiently protected depending on the type of collision of the vehicle (for example, oblique collision). There is room for improvement in terms of further improving safety.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an occupant protection system that can sufficiently protect the occupant's head and chest, thereby further improving safety. and

An occupant protection system according to the present invention comprises a first airbag that deploys toward an occupant from the front of a vehicle, a second airbag that is provided below the first airbag and deploys toward the occupant, and a vehicle collision prevention system. or a collision type detection device that detects a collision prediction and detects a collision type, wherein the collision type detection device includes a first collision type and a collision type from the first collision type and a second collision mode in which a collision load acts on the outer side in the vehicle width direction, and the second airbag deploys the first deployment when the first collision mode is detected. and deploys in a second deployment mode different from the first deployment mode when the second collision mode is detected, and in the second deployment mode, the second airbag is deployed with the second airbag. The first airbag is guided in a direction in which a collision load acts.

Further, in the occupant protection system according to the present invention, the first airbag may have a polygonal shape when viewed from the top of the vehicle when deployed.

Further, in the occupant protection system according to the present invention, the second airbag may be provided with an inclined portion for guiding the first airbag in a direction in which a collision load acts.

Further, in the occupant protection device according to the present invention, the second airbag has an upward protrusion that protrudes upward, and the upward protrusion guides the first airbag in a direction in which a collision load acts. You may do so.

Further, in the occupant protection device according to the present invention, the second airbag has a rear projection portion that projects rearward, and the rear projection portion guides the first airbag in a direction in which a collision load acts. You may do so.

Further, in the occupant protection system according to the present invention, the second airbag has a plurality of sub-airbags, and in the first deployment mode, the first sub-airbag among the plurality of sub-airbags is deployed. In the second deployment mode, the first sub airbag and the second sub airbag among the plurality of sub airbags are deployed, and the deployed second sub airbag collides with the first airbag. It may be guided in the direction in which the load acts.

Further, in the occupant protection system according to the present invention, in the second deployment mode, the second sub airbag provided in the vehicle width direction opposite to the direction in which the collision load acts is deployed. may

According to the present invention, it is possible to provide an occupant protection system that sufficiently protects the occupant's head and chest, thereby further improving safety.

1 is a sectional view schematically showing a portion of a vehicle provided with an occupant protection device according to an embodiment of the invention; FIG. FIG. 4 is a plan view and a front view of the occupant protection device when it is deployed; FIG. 10 is a side view and a plan view (1/2) showing the deployment transition of the passenger protection device; FIG. 11 is a side view and a plan view (2/2) showing the deployment transition of the passenger protection device; FIG. 9A is a side view, a plan view, and a front view showing a modified example of the passenger protection device;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view of a portion of a vehicle equipped with an occupant protection system.
FIG. 2A-1 is a plan view of the knee airbag device 120 deployed in the first collision mode, and FIG. 2A-2 is a plan view of the knee airbag device 120 in the second collision mode. 2(B-1) is a plan view when the body airbag device 110 is deployed, and FIG. 2(B-2) is a plan view when the body airbag device 110 is deployed. It is a front view of.
3A-1 is a side view of the occupant protection device when it is not deployed, FIG. 3A-2 is a plan view of the occupant protection device when it is not deployed, and FIG. ) is a side view of the knee airbag device 120 deployed in the second collision mode, and FIG. 3B-2 is a plan view of the knee airbag device 120 deployed in the second crash mode. be.
FIG. 4(C-1) is a side view of upper body airbag device 110 and knee airbag device 120 when deployed in the second collision mode, and FIG. 4(C-2) is a side view of the second collision mode. 4D-1 is a plan view of the upper body airbag device 110 and the knee airbag device 120 in the second collision mode when the upper body airbag device 110 and the knee airbag device 120 are deployed. FIG. FIG. 4(D-2) is a side view when deployed (especially showing the positional relationship with the occupant), and FIG. FIG. 4 is a plan view (particularly showing a positional relationship with an occupant);
5(A-1), (B-1), and (C-1) are a side view, a plan view, and a plan view showing deployment of the upper body airbag device 110 and the knee airbag device 120 in the first collision mode. 5(A-2), (B-2), and (C-2) are front views, and FIGS. 5(A-2), 5(B-2), and 5(C-2) are modified examples of deployment of the upper body airbag device 110 and the knee airbag device 120 in the second collision mode. 1 is a side view, a plan view, and a front view.

In the present embodiment, "front" and "rear" are based on the state in which the passenger P is seated on a seat 10 described later (the viewpoint of the passenger P is the reference).
That is, "front" means "front of the vehicle", and "rear" means "rear of the vehicle".
Also, the terms “left” and “right” refer to the sides of the vehicle 1 (in the vehicle width direction).
Also, the terms “upper” and “lower” refer to the vertical direction (vehicle height direction) of the vehicle 1 .
Further, "F" indicates collision load, and "I" indicates inertial force.

(Configuration of vehicle 1)
As shown in FIG. 1, a passenger compartment (vehicle interior) of a vehicle 1 is provided with an underfloor 3 at the bottom and a roof 4 at the top. A seat 10 is arranged on the underfloor 3. - 特許庁

The seat 10 is for a passenger P who gets into the vehicle 1 to sit. The seat 10 includes a seat cushion 11 (seat portion) supporting the buttocks and thighs of the occupant P, a seat back 12 (backrest portion) provided so as to be reclinable, and a headrest 13 supporting the head of the occupant P. (head part) and.
Furthermore, the vehicle 1 is provided with an occupant protection device 101 .
In the following description, the occupant protection device 101 for the front passenger seat will be described.

(Structure of Passenger Protection Device 101)
The occupant protection device 101 mainly includes an upper body airbag device 110, a knee airbag device 120, and a vehicle control device (hereinafter referred to as an ECU 201). The upper body airbag device 110 and the knee airbag device 120 are provided inside the dashboard 5 .
Furthermore, the ECU 201 has the function of a collision speed detection device that detects a collision of the vehicle 1 and a collision prediction, and detects the collision speed.
Further, the ECU 201 has a function of a collision type detection device that detects a collision of the vehicle 1 and collision prediction, and also detects a collision type (for example, frontal collision, oblique collision, side collision, etc.).
Furthermore, the ECU 201 also has the function of an airbag deployment control unit (hereinafter referred to as ACU), which is a deployment control device. That is, the ECU 201 also functions as an airbag deployment device. Note that the collision speed detection device and the ACU may be provided separately from the ECU 201 .

(Upper body airbag device 110)
The upper body airbag device 110 is controlled by the ECU 201 (ACU) and mainly protects the passenger P's head, chest, and the like. The upper body airbag device 110 also has an upper body inflator 111 (see FIG. 2) and an upper body airbag body 112 (see FIG. 2).

(Upper body inflator 111)
The upper body inflator 111 ignites an explosive in response to an actuation signal based on the ECU 201 detecting or predicting a collision of the vehicle 1, and generates gas through a chemical reaction caused by combustion. Also, the gas generated in the upper body inflator 111 is pressurized into the upper body airbag body 112 .
Moreover, the upper body inflator 111 may have a plurality of inflators, and the number of inflators that generate gas may be set according to the collision speed and collision mode detected by the ECU 201 . Also, the body inflator 111 can adjust the amount of gas to be generated, and may control the amount of gas to be generated according to the collision speed and collision type detected by the ECU 201 .

(Upper body airbag body 112)
The upper body airbag body 112 is a bag into which gas is injected by the upper body inflator 111, and is folded into a small size when not in operation. Further, when gas is injected from the upper body inflator 111, the upper body airbag body 112 is deployed in the direction from the dashboard 5 toward the seat 10, and the vehicle 1 collides with the occupant P's head and chest. to mitigate the impact of
In this embodiment, the expansion and deployment of the upper body airbag body 112 and knee airbag bodies 122a to 122c, which will be described later, is simply referred to as "deployment".

In addition, as shown in FIG. 2B-1, the upper body airbag body 112 has a polygonal shape when it is deployed when viewed from the top of the vehicle 1 (vehicle top view). An occupant protection surface 112C for protecting the head, chest, etc. of the occupant P, and inclined surfaces 112L and 112R are formed.
Further, as shown in FIG. 2B-2, the shape when unfolded is formed in a polygonal shape when viewed from the occupant P side, and a lower inclined surface 112sa is formed below the inclined surface 112L. A lower inclined surface 112sb is formed below the inclined surface 112R.
The reason why the upper body airbag body 112 has such a shape will be described later.

(Knee airbag device 120)
The knee airbag device 120 is controlled by the ECU 201 (ACU) and mainly protects the legs (for example, knees, shins, etc.) of the passenger P. The knee airbag device 120 also has knee inflators 121a to 121c (see FIG. 2) and knee airbag bodies 122a to 122c (see FIG. 2).

When the occupant protection device 101 is activated, the space between the occupant P and the dashboard 5 (in-vehicle device) is defined by the upper body airbag body 112, at least one knee airbag body 122a to 122c, It is designed to be filled with
Note that when the ECU 201 detects a collision detection or collision prediction of the vehicle 1, the knee airbag device 120 is first activated to fill the space between the passenger P and the dashboard 5 (in-vehicle device), thereby reducing the impact on the passenger. It restricts the movement of P's waist in the front-back direction.
Then, the upper body airbag device 110 is activated after, for example, several tenths of a second from the activation of the knee airbag device 120, so that the occupant P whose waist is restrained from moving forward and backward is placed in a suitable position of the upper body airbag body 112. protect with

(Knee inflators 121a to 121c)
The knee inflators 121a to 121c ignite an explosive in response to an actuation signal based on the ECU 201 detecting or predicting a collision of the vehicle 1, and generate gas through a chemical reaction caused by combustion. Further, the gas generated in the knee inflator 121a is pressurized into the knee airbag body 122a, the gas generated in the knee inflator 121b is pressurized into the knee airbag body 122b, and the gas generated in the knee inflator 121c is injected into the knee airbag body 122b. are press-fitted into the knee airbag body 122c.

Here, the knee airbag device 120 has knee airbag bodies 122a to 122c (a plurality of sub-airbags) inside an outer bag body 123, as shown in FIG. The body 123 is formed with a fracture portion 123a and a fracture portion 123c.
Then, when the gas generated by the knee inflator 121a is pressurized into the knee airbag body 122a, the knee airbag body 122a expands, breaks the breaking portion 123a, and the knee airbag body 122a becomes the outer bag body. It protrudes outside from 123 .
Similarly, when the gas generated by the knee inflator 121c is pressurized into the knee airbag body 122c, the knee airbag body 122c expands, breaks the rupture portion 123c, and the knee airbag body 122c becomes the outer bag. It protrudes outside from the body 123 .
The knee airbag body 122b functions as a first sub airbag, and the knee airbag bodies 122a and 122c function as second sub airbags.

The outer bag 123 only serves as a cover for the knee airbags 122a to 122c, and is not directly deployed by an inflator. It deploys (indirectly deploys) in the direction of the seat 10 while being pressed by the bag body 122b.
The outer bag 123 is not necessarily provided, and the knee airbag 122a, the knee airbag 122b, and the knee airbag 122c may be exposed.

(Knee airbag bodies 122a to 122c)
The knee airbag bodies 122a-122c are bags into which gas is injected by the knee inflators 121a-121c, and are folded into a small size when not in operation. Knee airbag bodies 122a-122c deploy from dashboard 5 toward seat 10 when gas is injected from knee inflators 121a-121c.

The knee airbag device 120 deploys different knee airbag bodies depending on the type of collision.
For example, in the first collision mode, only knee airbag body 122b is deployed, and knee airbag body 122a and knee airbag body 122c are not deployed.
On the other hand, for example, in the second collision mode, the knee airbag body 122b is deployed, and depending on the direction of the collision, the knee airbag body 122a or the knee airbag body 122c is deployed. do.
In this embodiment, the first collision type is a "frontal collision" and the second collision type is an "oblique collision (oblique collision)".
In addition, in the first collision type "frontal collision", for example, the collision load shown by the arrow "F" in FIG. 2(A-1) acts. On the other hand, in the second type of collision, “oblique collision,” the collision load indicated by the arrow “F” in FIG. 2(A-2) acts. In other words, in the second collision type "oblique collision", the collision load acts on the outer side in the vehicle width direction than in the first collision type "frontal collision".

In the first collision mode, the knee airbag body 122b protects the legs of the occupant P as shown in FIG. 2A-1. As shown in (A-2), the knee airbag body 122b and the knee airbag body 122a or the knee airbag body 122c protect the legs of the occupant P (for example, the knee airbag body 122b). protects the front of the knees and shins of the occupant P, and protects above the knees of the occupant P by the knee airbag body 122c.

(ECU 201)
The ECU 201 is for controlling the vehicle 1 as a whole. The ECU 201 also includes a CPU (Central Processing Unit) as a central processing unit, a control program executed by the CPU, a data table, a ROM (Read Only Memory) for storing commands and data, and a ROM (Read Only Memory) for temporarily storing data. It is equipped with a RAM (Random Access Memory) for storage, an EEPROM (Electrically Erasable and Programmable Read Only Memory) consisting of a rewritable non-volatile memory, and an input/output interface circuit, and controls the control of the vehicle 1 .

Also, the ECU 201 performs collision prediction and collision determination based on information from an acceleration sensor (G sensor), a distance sensor, an impact sensor (pressure sensor), and the like, and detects the collision speed. That is, the ECU 201 functions as a collision speed detection device.
Note that the acceleration sensor, the distance sensor, the impact sensor, and the like may be provided outside as devices separate from the ECU 201 . Information input from these sensors or the like may be acquired based on image data input from the vehicle-mounted camera 50 .

In addition, the ECU 201 performs collision prediction and collision determination based on information obtained from an exterior photographing camera, a millimeter wave radar, a steering wheel angle sensor, etc. ) and direction of impact (e.g., first or second direction of impact). That is, the ECU 201 functions as a collision type detection device.

Further, the ECU 201 determines the knee airbag bodies 122a to 122c to deploy based on the detected collision mode and collision direction.
That is, if it is the first collision type, it is decided to deploy only the knee airbag body 122b, and if it is the second collision type and the first collision direction, the knee airbag body 122b is determined. , the knee airbag body 122c is deployed, and in the second collision mode and in the second collision direction, the knee airbag body 122b and the knee airbag body 122a are deployed. decide to expand the
In the present embodiment, the first collision direction is the "right front" of the vehicle 1, and the second collision direction is the "left front" of the vehicle 1. As shown in FIG.

In addition, the ECU 201 determines the upper body inflator 111 of the upper body airbag device 110, and the determined knee airbag bodies 122a to 122c to deploy and The corresponding knee inflators 121a to 121c are activated to deploy the upper body airbag body 112 and the knee airbag bodies 122a to 122c, respectively. That is, the ECU 201 functions as a deployment control device.

As other components, a seatbelt device 30, an occupant posture correction device 40, and an in-vehicle camera 50 are provided.

(Seat belt device 30)
The seatbelt device 30 includes a webbing 31, a retractor (not shown), a lap anchor, a shoulder anchor, a tongue, and a buckle.
The webbing 31 is a strip-shaped belt, one end of which is fixed to a lap anchor provided at the bottom of the seat 10 and the other end of which is attached to the inside of the seat back 12 via a shoulder anchor provided at the top of the seat back 12. It is wound up in a retractor provided on the

A tongue is a T-shaped connecting fitting for connecting with a buckle. Further, the tongue is provided with an insertion hole through which the webbing 31 is inserted, and is slidably provided with respect to the webbing 31 .
The buckle is a connecting part for attaching and detaching a tongue, and is provided on the vehicle width direction inner side (vehicle center side) of the seat cushion 11 of the seat 10 .

Further, when the seatbelt device 30 senses an impact, the retractor reels in the webbing 31 to draw the occupant P into the seat 10 (seatback 12 side). Furthermore, the seatbelt device 30 is configured such that the retractor retracts the webbing 31 even when the ECU 201 detects a collision prediction.
Note that the seat belt device 30 may switch the force with which the retractor retracts the webbing 31 depending on the collision speed and collision mode detected by the ECU 201 . In addition, although the seat belt device 30 of the present embodiment is integrated with the seat 10, it is not limited to this, and the lap anchor is fixed to the side wall surface of the side sill, or the shoulder anchor is fixed. It may be provided on the side wall of the center pillar, or the retractor may be provided inside the center pillar.

(Passenger Posture Corrector 40)
The occupant posture correcting device 40 changes the angle of the seat back 12 in order to correct the posture of the occupant P to a predetermined posture when the ECU 201 detects a collision prediction. Further, the occupant posture correction device 40 may change the angle of the seat cushion 11 when the ECU 201 detects a collision prediction. Further, the occupant posture correcting device 40 may change the angles of both the seat back 12 and the seat cushion 11 when the ECU 201 detects a collision prediction.

Further, the occupant posture correcting device 40 is provided with a plurality of airbags in the seat back 12, and when the ECU 201 detects a collision prediction, deploys predetermined airbags to correct the posture of the occupant P. may
Further, the occupant posture correcting device 40 is not provided on the seat 10, but deploys a predetermined airbag or the like from the front or side of the vehicle 1 to correct the posture of the occupant P to a predetermined posture. may be Note that the occupant's posture correction may be other than adjusting the angle of the airbag or the seat.

(In-vehicle camera 50)
The in-vehicle camera 50 detects the sitting state of the passenger P seated on the seat 10, for example, the posture of the passenger P. As shown in FIG. That is, the in-vehicle camera 50 functions as an occupant posture detection device.
For example, the ECU 201 determines the knee airbag body 122 to deploy based on information obtained from the vehicle-mounted camera 50 (for example, the seated state of the occupant P) in addition to the above-described collision mode and collision direction. good too.
The occupant posture detection device is not limited to one that uses the vehicle-mounted camera 50, and may be one that detects the posture of the occupant P using a pressure sensor on the seat 10, for example.
Also, the vehicle-mounted camera 50 may detect the position of the passenger P seated on the seat 10 , for example, the position of the seat 10 . That is, the in-vehicle camera 50 may function as an occupant position detection device.

The vehicle-mounted camera 50 only captures an image of the interior of the passenger compartment including the passenger P, and outputs captured image data to the ECU 201. The posture and seating position of the passenger P are detected by the ECU 201. may
Note that the on-vehicle camera 50 may also be used as a camera such as a drive recorder that captures images of the surroundings of the vehicle 1 and the interior of the vehicle 1 and uses the images when the vehicle 1 is impacted. good.

(Deployment form of the occupant protection device 101)
Next, a deployment form of the passenger protection device 101 will be described with reference to FIG.

First, FIG. 2A-1 is a plan view of the knee airbag device 120 when deployed in a first collision mode.
In the first collision mode, the ECU 201 activates the knee inflator 121b to pressurize the gas generated by the knee inflator 121b into the knee airbag body 122b.
On the other hand, in the first collision mode, the ECU 201 does not operate the knee inflators 121a and 121c.
As a result, only the knee airbag body 122b deploys from the dashboard 5 toward the seat 10. As shown in FIG.
The legs of the occupant P are protected by the knee airbag body 122b.
Note that the developed form shown in FIG. 2A-1 constitutes the "first developed form".

Next, FIG. 2A-2 is a plan view of the deployed knee airbag device 120 in the second collision mode.
2A-2 assumes that the ECU 201 detects the second collision mode and the first collision direction.
In the second collision mode and in the first collision direction, the ECU 201 operates the knee inflator 121b to pressurize the gas generated in the knee inflator 121b into the knee airbag body 122b, and further, The knee inflator 121c is operated to force the gas generated by the knee inflator 121c into the knee airbag body 122c.
As a result, the knee airbag body 122b is deployed from the dashboard 5 toward the seat 10, and the knee airbag body 122c is deployed from the dashboard 5 toward the seat 10 to break the rupture portion 123c. and protrudes outside from the outer bag body 123 .
The knee airbag body 122c has an "upper protrusion 122T" that protrudes upward from the portion that protrudes outward from the outer bag 123, and part or all of the "upper protrusion 122T" has , and an “inclined portion 122S” that inclines from the front to the rear in the inward direction (the inward direction in the knee airbag device 120).

Although not shown in FIG. 2(A-2), when it is assumed that the second collision mode is the second collision mode and the second collision direction is detected, the knee airbag body 122a is positioned on the dashboard 5. 10, and protrudes outside from the outer bag body 123 by breaking the breaking portion 123a.
The developed form shown in FIG. 2A-2 constitutes the "second developed form".
Like the knee airbag body 122c, the knee airbag body 122a has an "upward protrusion 122T" that protrudes upward from the portion that protrudes outward from the outer bag body 123. has an "inclined portion 122S" that inclines from the front toward the rear (the inward direction in the knee airbag device 120).
The action of the "inclined portions 122S" of the knee airbag body 122a and the knee airbag body 122c will be described later.

Next, FIG. 2B-1 is a plan view of the upper body airbag device 110 when it is deployed, and FIG. is a view seen from the P side).
The upper body airbag device 110, whether in the first collision mode or in the second collision mode, has an upper body airbag bag as shown in FIGS. 2B-1 and 2B-2. Unfold body 112 . In addition, in the second collision mode, regardless of whether the collision direction is the first collision direction or the second collision direction, as shown in FIGS. The body airbag body 112 is deployed.
That is, the knee airbag device 120 deploys only the knee airbag body 122b, deploys the knee airbag body 122b and the knee airbag body 122a, and deploys the knee airbag body 122b and the knee airbag body 122b. However, the upper body airbag device 110 only has the case of deploying the upper body airbag body 112 .

(Operation Transition of Passenger Protection Device 101)
Next, operation transition of the passenger protection device 101 will be described with reference to FIGS. 3 and 4. FIG.

First, FIGS. 3(A-1) and 3(A-2) show a side view and a plan view of a state in which none of the collision modes have occurred. In this state, both the upper body airbag device 110 and the knee airbag device 120 are not deployed.
After that, it is assumed that the ECU 201 detects the second collision mode and the first collision direction.

Next, FIGS. 3B-1 and 3B-2 show a second collision mode, in which the knee airbag device 120 is deployed when the first collision direction is detected by the ECU 201. Fig. 3 shows a side view and a plan view of the state; Specifically, the knee airbag body 122b and the knee airbag body 122c are deployed, and in the knee airbag body 122c, as shown in FIG. ” protrudes upward.
Also, since it is assumed that the first collision direction has been detected, the collision load indicated by (F) and the inertial force indicated by (I) are acting in the figure.

Next, FIGS. 4C-1 and 4C-2 further show a side view and a plan view of the state in which the upper body airbag device 110 is deployed. Here, when the upper body airbag body 112 is deployed toward the occupant P, as shown in FIG. It abuts on the "inclined part 122S" of the body 122c.
When the inclined surface 112L of the upper body airbag body 112 abuts against the "slanted portion 122S" of the knee airbag body 122c, the deployment direction of the upper body airbag body 112 and the upper body airbag body 112 and the shape of the "inclined portion 122S" of the knee airbag body 122c, the inclined surface 112L of the upper body airbag body 112 and the " The upper body airbag body 112 moves toward the inside of the vehicle 1 (“right” shown in FIG. 4(C-2)) while being in sliding contact with the inclined portion 122S.
That is, the deployed knee airbag body 122c guides the upper body airbag body 112 in the direction (rightward) where the collision load acts.
Further, in the vehicle width direction, the knee airbag body 122c provided in the opposite direction (for example, leftward) to the direction in which the collision load acts (rightward) is deployed.
At this time, an inclined surface (inclined surface 112L) is formed in the upper body airbag body 112, and an inclined surface (inclined portion 122S) is also formed in the knee airbag body 122c. The airbag body 112 can be moved inwardly of the vehicle 1 ("right" shown in FIG. 4(C-2)).

Next, FIGS. 4D-1 and 4D-2 show a side view and a plan view of the occupant P's head and chest protected by the upper body airbag device 110. FIG. First, the dashed line in FIG. 4(D-2) particularly indicates the deployed position of the upper body airbag body 112 when the knee airbag body 122c is not deployed. The occupant P's head and chest contact the ends of the occupant protection surface 112C of the upper body airbag body 112, and the occupant P's head and chest cannot be protected at a suitable position of the occupant protection surface 112C.
On the other hand, the knee airbag body 122c is deployed, and the upper body airbag body 112 is moved toward the inside of the vehicle 1 by the "upper projecting portion 122T" of the knee airbag body 122c (Fig. 4 (C-2)). 4 (D-2), the head and chest of the occupant P are positioned at the center of the occupant protection surface 112C of the upper body airbag body 112, as indicated by the thick line in FIG. 4(D-2). can be protected.

In this manner, when the second collision mode occurs, the knee airbag body is deployed in accordance with the direction of the collision, and the legs of the occupant P are protected by the deployed knee airbag body. Furthermore, by moving the upper body airbag body 112 in the direction in which the collision load acts with the "upper projecting portion 122T" of the deployed knee airbag body, the occupant P is positioned at a suitable position on the occupant protection surface 112C. can protect the head and chest of
Also, the upper body airbag body 112 is formed in a polygonal shape, and in the example of FIG. By bringing the upper body airbag body 112 into sliding contact with the inclined portion 122S, the upper body airbag body 112 can be quickly moved toward the inside of the vehicle 1 (“right” shown in FIG. 4(C-2)). Even when the occupant P moves at a high speed due to inertial force, the occupant P's head and chest can be protected at a suitable position of the occupant protection surface 112C.

(Modification of knee airbag body)
Next, a modified example of the knee airbag body will be described with reference to FIG.

FIGS. 5(A-1), (B-1), and (C-1) show the first collision mode. is deployed, and above it, the upper body airbag body 112 of the upper body airbag device 110 is deployed. Since the knee airbag body 122a and the knee airbag body 122c are not deployed, the upper body airbag body 112 can be deployed straight rearward because the "upward projecting portion 122T" does not protrude. becomes.

In contrast, FIGS. 5(A-2), (B-2), and (C-2) are the second collision mode, and assume that the first collision direction is detected. , in that it does not have the above-described "upward protrusion 122T" and instead has a "rearward protrusion 122Z".
That is, in the above-described embodiment, the upper body airbag body 112 is moved in the direction in which the collision load acts by the "upward projecting portion 122T". Even if the "backward projecting portion 122Z" that expands in the direction is provided, the same effect as in the case of providing the "upward projecting portion 122T" can be expected.

Specifically, as shown in FIG. 5A-2, the “rearward projecting portion 122Z” of the knee airbag body 122c deploys along the vehicle 1 front-rear direction. Then, as shown in FIGS. 5B-2 and 5C-2, when the upper body airbag body 112 deploys, the lower inclined surface 112sa of the upper body airbag body 112 in particular becomes "rearward". After riding on the projecting portion 122Z, the upper body airbag body 112 moves inward of the vehicle 1 (“right” in FIG. 5(C-2)).
That is, even if the knee airbag body 112 is not deployed upward but is deployed rearward, the upper body airbag body 112 can be moved in the direction in which the collision load acts. The head and chest of the occupant P can be protected in position.
Part or all of the "backward projecting part 122Z" may also have the "inclined part 122S" formed in the "upper projecting part 122T". As a result, the same effects as those of the "inclined portion 122S" formed on the "upper projecting portion 122T" can be obtained.

Although the present embodiment has been described above, it is not limited to the contents described above, and may be appropriately modified as follows.

In this embodiment, the upper body airbag body 112 is formed in a polygonal shape, but the shape is not limited to this. For example, it may be circular.

In the present embodiment, the inclined surfaces 112L and 112R are surfaces that contact the knee airbag body 122a or the knee airbag body 122c, but the functions of the inclined surfaces 112L and 112R are not limited to this. , the inclined surface 112L, and the inclined surface 112R may have the function of protecting the head, chest, and the like of the occupant P.

In this embodiment, the knee airbag bodies 122a to 122c are deployed from the front of the vehicle 1, but the present invention is not limited to this. For example, you may make it expand|deploy from a vehicle width direction.

In the present embodiment, in the knee airbag bodies 122a and 122c, the "upward protrusion 122T" and the "backward protrusion 122Z" are partially or entirely provided with the inclined portion 122S. , and the shape of the "rear protrusion 122Z" is not limited to this. For example, the inclined portion 122S may not be provided.

In this embodiment, knee inflators 121a-121c are provided for knee airbag bodies 122a-122c, respectively, but a single inflator may be provided. In this case, for example, a switching valve may be provided to open the switching valve corresponding to the deployed knee airbag body and to close the switching valve corresponding to the non-deployed knee airbag body.

In the present embodiment, only the knee airbag body 122b is deployed in the first collision mode. You may make it expand|deploy either one or both.

In this embodiment, in the second collision mode, the knee airbag body 122b and either one of the knee airbag body 122a and the knee airbag body 122c are deployed. Both the body 122b and the knee airbag bodies 122a and 122c may be deployed.

In the present embodiment, an oblique collision has been described as an example of the second collision type, but other collision types may be used. For example, it may be a side collision.

In the present embodiment, the occupant protection device 101 for the passenger seat has been described, but the same can be applied to the occupant protection device for the driver's seat, and the same can be applied to the occupant protection device for the rear seat. may apply.

In the present embodiment, the upper body airbag body 112 constitutes the first airbag of the present application, the knee airbag bodies 122a to 122c constitute the second airbag of the present application, and the ECU 201 constitutes the second airbag of the present application. constitutes a collision type detection device.
Further, in the present embodiment, the knee airbag body 122b constitutes the first sub airbag of the present application, and the knee airbag bodies 122a and 122c constitute the second sub airbag of the present application, and the upward projecting portion 122T constitutes an upward projecting portion of the present application, a rearward projecting portion 122Z constitutes a rearward projecting portion of the present application, and an inclined portion 122S constitutes an inclined portion of the present application.

1: Vehicle 110: Upper Body Airbag Device 112: Upper Body Airbag Body 120: Knee Airbag Device 122a to 122c: Knee Airbag Body 201: ECU

Claims (7)

a first airbag that deploys toward the occupant from the front of the vehicle;
a second airbag provided below the first airbag and deployed to the occupant;
A collision type detection device that detects a collision or collision prediction of a vehicle and detects a collision type;
An occupant protection device for a vehicle comprising
The collision type detection device is
It is possible to detect a first collision type and a second collision type in which a collision load acts on the outside of the first collision type in the vehicle width direction,
The second airbag is
When the first collision mode is detected, the vehicle is deployed in the first deployment mode, and when the second collision mode is detected, the vehicle is deployed in the second deployment mode different from the first deployment mode. ,
In the second deployment mode, the second airbag guides the first airbag in a direction in which a collision load acts.
An occupant protection device for a vehicle, characterized by: The first airbag has a polygonal shape when viewed from the top of the vehicle when deployed.
The vehicle occupant protection device according to claim 1, characterized in that: The second airbag is provided with an inclined portion for guiding the first airbag in a direction in which a collision load acts,
An occupant protection device for a vehicle according to claim 1 or 2, characterized in that: The second airbag has an upward protrusion that protrudes upward,
the upward protrusion guides the first airbag in a direction in which a collision load acts;
The vehicle occupant protection device according to any one of claims 1 to 3, characterized in that: The second airbag has a rear projection that projects rearward,
the rear projection guides the first airbag in a direction in which a collision load acts;
The vehicle occupant protection device according to any one of claims 1 to 3, characterized in that: The second airbag has a plurality of sub-airbags,
In the first deployment mode, a first sub-airbag among the plurality of sub-airbags is deployed,
In the second deployment mode, the first sub-airbag and the second sub-airbag among the plurality of sub-airbags are deployed,
guiding the first airbag in the direction in which the collision load acts with the deployed second sub-airbag;
The vehicle occupant protection device according to any one of claims 1 to 5, characterized in that: In the second deployment mode, in the vehicle width direction, the second sub airbag provided in the direction opposite to the direction in which the collision load acts is deployed.
The vehicle occupant protection device according to claim 6, characterized in that:

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