JP7129299B2 - 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 use airbag devices to protect passengers from collisions and the like.
In the event of a frontal collision, knee airbags deploy at the front of the knees to reduce injuries caused by collisions between the knees and interior components, prevent misalignment of the waist, which is the axis of rotation of the upper body, and stabilize the behavior of the upper body. is proposed.

For example, knee airbags are stored in the instrument panel (used here as a synonym for the dashboard) without being folded in the width direction so that they can accommodate the knees of a seated occupant when deployed. A knee airbag device for a vehicle has been proposed. Since this vehicle knee airbag device is stored without being folded to the left and right, it has a wide left and right width from the initial inflation state. The knee airbag deploys to reliably protect the legs of the occupant (see Patent Document 1).

On the other hand, the durability against the load from the soles of human feet is unexpectedly high, and even a load of "1 ton" can be withstood by the thighs. Therefore, it has been found that if the occupant is able to hold his/her leg in the event of a frontal collision, the injury value can be reduced due to the impact resistance of the skeleton.

Japanese Patent Application Laid-Open No. 2007-137150

However, conventional knee airbag devices are not intended for the occupant's legs. For example, if the occupant's lower legs are straight, it is easier to step on the legs. It is difficult to make it straight, and it is not suitable for sticking.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an occupant protection system capable of protecting the occupant by making it easier for the occupant to take a protective posture.

A vehicle occupant protection device according to the present invention includes a leg position detection device for detecting the front and rear positions of the leg heels of an occupant seated on a seat, and a floor on which the occupant's heels are placed, An airbag having a plurality of air chambers in the front-rear direction of the vehicle, a collision detection device for detecting a vehicle collision or a collision prediction, and when the collision detection device detects a collision or a collision prediction, in deploying the airbag, and a deployment control device for deploying an air chamber in front of the heel position detected by the leg position detection device.

Further, the deployment control device also deploys the air chamber of the airbag arranged below the heel position, and deploys the air chamber in front of the heel position above the air chamber at the heel position. You may do so.

Further, the deployment control device deploys the airbag at low speed when the collision detection device detects a collision prediction, and deploys the airbag at high speed when the collision detection device detects a collision. It may be expanded.

Further, a plurality of auxiliary members separated in the longitudinal direction of the vehicle are provided above the airbag, and the auxiliary members corresponding to the air chambers in which the airbags are deployed move in the direction of the seat as the air chambers are deployed. may be rotated to

According to the present invention, it is possible to provide an occupant protection device that can protect the occupant by making it easier for the occupant to take a protective posture.

1 is a cross-sectional view schematically showing a part of a vehicle equipped with an occupant protection device according to an embodiment of the invention; FIG. 1 is a schematic cross-sectional view of a part of a vehicle provided with an occupant protection device that also deploys the heel position; FIG. 1 is a schematic cross-sectional view of a part of a vehicle with an occupant protection device provided with an auxiliary board; FIG.

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 cross-sectional view schematically showing a portion of a vehicle equipped with an occupant protection system according to an embodiment of the invention. 1(a) is a schematic cross-sectional view of the occupant protection device according to the present embodiment before operation, and FIG. 1(b) is a schematic cross-sectional view of the occupant protection device according to the present embodiment after operation. be.

(Configuration of vehicle 1)
As shown in FIG. 1, a vehicle 1 is provided with a floor panel 5 that separates a passenger compartment and an underfloor space, and a roof 4 is provided above the passenger compartment. An underfloor (not shown) is provided in the lower portion of the vehicle 1 . Furthermore, a seat 10 and a floor mat 3 are arranged on the floor panel 5 . Also, the floor panel 5 is provided with an occupant protection device 31 . Part of the occupant protection device 31 may be provided in an underfloor space or the like between the floor panel 5 and the underfloor.

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 bag 12 (backrest portion) provided so as to be reclinable, and a headrest 13 supporting the head of the occupant P. (head part) and.

(Structure of Passenger Protection Device 31)
The occupant protection device 31 includes an in-vehicle camera 40 , an inflator 121 , an airbag 131 , and a vehicle control device (hereinafter referred to as ECU) 201 . The ECU 201 also functions as a collision detection device and an airbag deployment control unit (hereinafter referred to as ACU) as a deployment control device. Moreover, you may make it provide a collision detection apparatus and ACU separately from ECU201. Furthermore, the occupant protection device 31 may include an upper body airbag device 50, a knee airbag device (not shown), and the like.

(Vehicle camera 40)
The vehicle-mounted camera 40 mainly captures the situation outside the vehicle 1 , outputs the captured image data to the ECU 201 , and acquires information for the ECU 201 to perform collision prediction and collision determination with respect to the vehicle 1 . Note that the vehicle-mounted camera 40 may not be provided unless the ECU 201 performs collision prediction and collision determination based on image data.
Moreover, the in-vehicle camera 40 may function as a leg position detection device that detects the state of the legs of the occupant P seated on the seat 10 . Specifically, the in-vehicle camera 40 detects the position of the heel of the occupant P and outputs to the ECU 210 where it is in the longitudinal direction of the vehicle 1 . Thereby, the ECU 201 can determine the heel position of the occupant P. In the present embodiment, it is assumed that a pressure sensor, which will be described later, is arranged on the floor on which the heel of the occupant P is placed, for example, the floor mat 3 .

The upper body airbag device 50 is controlled by the ECU 201 (ACU) and mainly protects the occupant P's head, chest, and the like. The upper body airbag device 50 also has an upper body inflator (not shown) and an upper body airbag body 51 .
When the ECU 201 (collision detection device) detects or predicts a collision of the vehicle 1, the upper body airbag device 50 inflates the upper body airbag body 51 by the upper body inflator and deploys toward the seat 10. , the impact of the collision of the vehicle 1 on the head, chest, etc. of the occupant P is mitigated.

Further, when a knee airbag device is provided, it is deployed so as not to interfere with the leg strain of the occupant P.

(Inflator 121)
The inflator 121 ignites an explosive in response to an actuation signal from the ECU 201 and generates gas through a chemical reaction caused by combustion. Also, the gas generated by the inflator 121 is forced into the airbag 131 .
In addition, the inflator 121 supplies gas independently to each of the first bag 131a, second bag 131b, third bag 131c, and fourth bag 131d of the airbag 131, which will be described later, according to an actuation signal input from the ECU 201. can supply.

(Airbag 131)
The airbag 131 is a bag into which gas is pressurized by the inflator 121 , and is folded into a small size and stored between the floor mat 3 and the floor panel 5 when not in operation. Further, the airbag 131 is inflated and deployed above the floor mat 3 when gas is injected from the inflator 121 .
At this time, the airbag 131 tears the upper floor mat 3 and protrudes upward. Also, the airbag 131 may protrude upward together with the upper floor mat 3 . Even in this case, it is desirable that the airbag 131 tear a part of the floor mat 3, for example, tear the floor mat 3 at the periphery of the airbag 131 to protrude.

Also, the airbag 131 has a plurality of air chambers and is divided into a plurality in the front-rear direction of the vehicle 1 . In addition, you may divide|segment into multiple also in the width direction of the vehicle 1. FIG. In this embodiment, the airbag 131 is divided into four air chambers in the longitudinal direction of the vehicle 1 .
Also, the airbag 131 is configured such that each of the divided air chambers can be independently inflated and deployed. Therefore, the air chambers of the airbag 131 are designated as first bag 131a, second bag 131b, third bag 131c, and fourth bag 131d from the front of the vehicle 1, respectively. Also, hereinafter, the first bag 131a, the second bag 131b, the third bag 131c, and the fourth bag 131d are collectively referred to as the bag of the airbag 131 as well.

Further, a pressure sensor (not shown) is provided so as to correspond to each bag of the airbag 131 . A plurality of pressure sensors are provided for each of the airbags 131 instead of one. Then, the position of the soles of the occupant P seated on the seat 10 can be detected. That is, the pressure sensor functions as a leg position detection device that detects the position of the heel of the occupant P with respect to the front-rear direction of the vehicle 1 and the front-rear position of the heel.

(ECU 201)
The ECU 201 is for controlling the vehicle 1 as a whole. The ECU 100 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 .

The ECU 201 also receives detection information from the pressure sensor. Then, the ECU 201 detects the heel position of the occupant P from the information detected by the pressure sensor.
Further, the ECU 201 inputs information about the outside of the vehicle 1 from the vehicle-mounted camera 40, and grasps and judges the external situation. Specifically, the ECU 201 performs collision prediction and collision determination with respect to the vehicle 1 based on image data input from the vehicle-mounted camera 40 . Note that the ECU 201 may perform collision prediction and collision determination based on information from an acceleration sensor (G sensor), an impact sensor (pressure sensor), or the like, regardless of information input from the vehicle-mounted camera 40 .

When the ECU 201 detects a collision prediction, the ECU 201 outputs to the inflator 121 an actuation signal for deploying a predetermined airbag 131 based on the detected heel position of the occupant P.
When predicting a collision, the ECU 201 outputs an actuation signal to the inflator 121 so that the airbag 131 in front of the occupant P's heel position is deployed.

That is, the ECU 201 outputs an actuation signal for deploying the first bag 131a when the detected heel position of the occupant P is above the second bag 131b. Also, if the heel position is above the third bag 131c, an actuation signal for deploying the first bag 131a and the second bag 131b is output. Also, if the heel position is above the fourth bag 131d, an actuation signal for deploying the first bag 131a, the second bag 131b and the third bag 131c is output.

In the present embodiment, the entire airbag 131 in front of the heel position of the occupant P is deployed. Only one bag may be deployed, or a predetermined number of airbags 131 in front of the occupant P's heel position may be deployed.
Further, in the present embodiment, the deployment amount of the airbag 131 is not particularly changed, but the deployment amount may be increased toward the front, for example. In this way, for example, when the width of the airbag 131 in the longitudinal direction of the vehicle 1 is reduced and the number of airbags 131 is increased, the height of the airbag 131 increases from the heel to the toe of the occupant P. It is possible to more effectively assist the occupant P's persistence.

(Operation of occupant protection device 31)
A case where the occupant P puts the heel on the third bag 131c of the airbag 131 and drives the vehicle 1 will be described below as an example.
The occupant protection device 31 activates the upper body airbag device 50 and the inflator 121 when the ECU 201 (collision detection device) predicts a collision of the vehicle 1 . Note that the operation when the ECU 201 detects the collision of the vehicle 1 is the same as the operation when the collision prediction is performed, so the explanation is omitted.

Specifically, the ECU 201 outputs an actuation signal to the upper body inflator when predicting a collision. When the activation signal is input, the upper body inflator generates gas and supplies the gas to the upper body airbag body 51 . As a result, the upper body airbag body 51 is inflated and deployed in front of the occupant P. As shown in FIG.

When the ECU 201 predicts the collision of the vehicle 1, the ECU 201 detects the heel position of the occupant P based on the detection signal of the pressure sensor. Here, the ECU 201 detects that the heel of the occupant P is above the third airbag 131c of the airbag 131 . When the ECU 201 detects that the heel of the occupant P is above the third airbag 131c of the airbag 131, the ECU 201 sends an actuation signal to the inflator 121 to deploy the first airbag 131a and the second airbag 131b of the airbag 131. to output

The inflator 121 generates gas in response to an actuation signal input from the ECU 201 and supplies the generated gas to the first bag 131 a and the second bag 131 b of the airbag 131 .
As a result, the first bag 131a and the second bag 131b of the airbag 131 are inflated to tear the upper floor mat 3 and protrude upward. Therefore, the portion of the occupant's P foot sole in front of the heel swells and becomes higher, making it easier to step on the leg. Therefore, it becomes easier for the occupant P to protect himself against the collision of the vehicle 1 (the injury value can be reduced by himself), and the occupant can be protected.

(Occupant protection device that deploys the heel position as well)
Next, an occupant protection device that also deploys an airbag corresponding to the heel position of the occupant P will be described.
FIG. 2 is a cross-sectional view schematically showing a portion of a vehicle equipped with an occupant protection device. 2(a) is a schematic cross-sectional view of the occupant protection system before actuation, and FIG. 2(b) is a schematic cross-sectional view of the occupant protection system after actuation.

(Structure of Passenger Protection Device 32)
As shown in FIG. 2, the occupant protection device 32 includes an inflator 122, an airbag 132, an ECU 202, and an in-vehicle camera (not shown).
The vehicle-mounted camera is the same as the vehicle-mounted camera 40 of the above-described embodiment, so description thereof will be omitted.

(Inflator 122)
The inflator 122 is similar to the inflator 121 of the above-described embodiment, but is independent of the first bag 132a, second bag 132b, third bag 132c, and fourth bag 132d of the airbag 132, which will be described later. different amounts of gas can be supplied. Note that the inflator 121 of the above embodiment does not have to have this function.

(Airbag 132)
The airbag 132 is similar to the airbag 131 of the above embodiment, and has a plurality of air chambers. Also, the air chambers of the airbags 132 are designated as a first bag 132a, a second bag 132b, a third bag 132c, and a fourth bag 132d from the front of the vehicle 1, respectively. Also, hereinafter, the first bag 132a, the second bag 132b, the third bag 132c, and the fourth bag 132d are collectively referred to as bags of the airbag 132 as well.
Each bag of the airbag 132 can be deployed to different sizes depending on the amount of gas supplied.

Further, pressure sensors (not shown) are provided for each of the airbags 132 in the same manner as in the above-described embodiment.

(ECU 202)
The ECU 202 is similar to the ECU 201 of the above-described embodiment, but outputs an actuation signal to the inflator 122 so as to deploy the airbag 132 in front of the passenger P's heel position when predicting a collision. At the same time, an actuation signal is output to the inflator 122 so that the airbag 132 at the heel position of the occupant P is also deployed.
Here, the ECU 202 suppresses the amount of gas supplied to the airbag 132 at the heel position of the occupant P so that the airbag 132 in front of the heel position of the occupant P is higher. In addition, an actuation signal for controlling the gas supply amount is output to the inflator 122 .

(Operation of occupant protection device 32)
A case where the occupant P puts the heel on the third bag 132c of the airbag 132 and drives the vehicle 1 will be described below as an example.
The occupant protection device 32 activates the upper body airbag device and the inflator 122 when the ECU 202 predicts a collision of the vehicle 1 .

Specifically, when the ECU 202 predicts a collision, it outputs an actuation signal to the upper body inflator as in the above-described embodiment. When an actuation signal is input, the upper body inflator generates gas and supplies the gas to the upper body airbag body. As a result, the upper body airbag body is inflated and deployed in front of the occupant P.

When the ECU 202 predicts the collision of the vehicle 1, the ECU 202 detects the heel position of the occupant P based on the detection signal of the pressure sensor. Here, the ECU 202 detects that the heel of the occupant P is above the third airbag 132c of the airbag 132 . When the ECU 202 detects that the heel of the occupant P is above the third bag 132c of the airbag 132, the ECU 202 sends an actuation signal to the inflator 122 to deploy the first bag 132a and the second bag 132b of the airbag 132. is output, and an actuation signal for deploying the third bag 132c is also output. However, the amount of gas for deploying the third bag 132c is adjusted so that the first bag 132a and the second bag 132b are higher than the third bag 132c.

The inflator 122 generates gas in response to an actuation signal input from the ECU 202, and distributes the generated gas to the first bag 132a, the second bag 132b, and the third bag 132c of the airbag 132 in a specified amount. supply.
As a result, the first bag 132a, the second bag 132b, and the third bag 132c of the airbag 132 are inflated, tearing the upper floor mat 3 and protruding upward, and the first bag 132a and the second bag 132b are expanded. is inflated and deployed higher than the third bag 132c.

Here, since the heel portion of the occupant P is lifted upward by the expansion and deployment of the third bag 132c, the occupant P can easily straighten the legs. The first bag 132a and the second bag 132b in front are higher than the third bag 132c at the heel position. Therefore, since the portion of the sole of the occupant P in front of the heel swells and becomes higher, it is easy for the occupant P to step on his/her legs, and the occupant P can easily protect himself/herself from the collision of the vehicle 1, thereby contributing to the protection of the occupant. .

(Occupant Protection Device with Auxiliary Board)
Next, an occupant protection device in which an auxiliary member (auxiliary board) is provided above the airbag will be described.
FIG. 3 is a cross-sectional view schematically showing a portion of a vehicle equipped with an occupant protection device. 3(a) is a schematic cross-sectional view of the occupant protection system before actuation, and FIG. 3(b) is a schematic cross-sectional view of the occupant protection system after actuation.

(Structure of Passenger Protection Device 33)
As shown in FIG. 3, the occupant protection device 33 includes an inflator 123, an airbag 133, an auxiliary board 153, an ECU 203, and an in-vehicle camera (not shown).
The vehicle-mounted camera is the same as the vehicle-mounted camera 40 of the above-described embodiment, so description thereof will be omitted.

(Inflator 123)
The inflator 123 is similar to the inflators 121 and 122 of the above embodiment.

(Airbag 133)
The airbag 133 is similar to the airbags 131 and 132 of the above embodiment. Also, the airbag 133 has a plurality of air chambers. The air chambers of the airbags 133 are designated as a first bag 133a, a second bag 133b, a third bag 133c, and a fourth bag 133d from the front of the vehicle 1, respectively.
Also, hereinafter, the first bag 133a, the second bag 133b, the third bag 133c, and the fourth bag 133d are collectively referred to as bags of the airbag 133 as well.

(auxiliary board 153)
The auxiliary board 153 is a plate-like member provided on the upper portion of the airbag 133, and is an auxiliary member for supporting the soles of the feet when the airbag 133 is deployed.
In addition, the auxiliary board 153 is divided into a plurality of pieces in the longitudinal direction of the vehicle 1, and the first board 153a is arranged so as to correspond to the first bag 133a, the second bag 133b, the third bag 133c, and the fourth bag 133d, respectively. , a second board 153b, a third board 153c, and a fourth board 153d.

The first board 153a, the second board 153b, the third board 153c, and the fourth board 153d of the auxiliary board 153 are arranged above the first bag 133a, the second bag 133b, the third bag 133c, and the fourth bag 133d of the airbag 133. , respectively. Also, the first board 153a, the second board 153b, the third board 153c, and the fourth board 153d each have a rotation axis on the rear side of the vehicle 1, and can rotate around this rotation axis. ing.

Therefore, when the first bag 133a, the second bag 133b, the third bag 133c, and the fourth bag 133d are deployed, the first board 153a, the second board 153b, the third board 153c, and the fourth board 153d rotate, The front side of the vehicle 1 of each auxiliary board 153 rises upward.
Also, hereinafter, the first board 153a, the second board 153b, the third board 153c, and the fourth board 153d are collectively referred to as a board of the auxiliary board 153 as well.

In this embodiment, the boards of the auxiliary board 153 are provided so as to be paired with the airbag 133, respectively, but they may be provided so as not to be paired.
Further, similarly to the above-described embodiment, pressure sensors (not shown) are provided so as to correspond to the bag of the airbag 133 and the board of the auxiliary board 153, respectively.

(ECU 203)
The ECU 203 has the same functions as the ECUs 201 and 202 of the above embodiment. In addition to the above, the ECU 203 may also control the auxiliary board 153 .

(Operation of occupant protection device 33)
A case where the occupant P puts the heel on the third bag 133c of the airbag 133 and drives the vehicle 1 will be described below as an example.
When the ECU 203 predicts the collision of the vehicle 1, the occupant protection device 33 activates the upper body airbag device and the inflator 123. FIG.

Specifically, when the ECU 203 predicts a collision, it outputs an actuation signal to the upper body inflator as in the above embodiment. When an actuation signal is input, the upper body inflator generates gas and supplies the gas to the upper body airbag body. As a result, the upper body airbag body is inflated and deployed in front of the occupant P.

When the ECU 203 predicts the collision of the vehicle 1, the ECU 203 detects the heel position of the occupant P based on the detection signal of the pressure sensor. Here, the ECU 203 detects that the heel of the occupant P is above the third airbag 133c of the airbag 133 . When the ECU 203 detects that the heel of the occupant P is above the third bag 133c of the airbag 133, the ECU 203 sends an actuation signal to the inflator 123 to deploy the first bag 133a and the second bag 133b of the airbag 133. to output

The inflator 123 generates gas in response to an actuation signal input from the ECU 203 and supplies the generated gas to the first bag 133 a and the second bag 133 b of the airbag 133 .
As a result, the first bag 133a and the second bag 133b of the airbag 133 are inflated and deployed.

Further, in the auxiliary board 153, when the first bag 133a and the second bag 133b of the airbag 133 are inflated and deployed, the axes of the first board 153a and the second board 153b of the auxiliary board 153 are rotated and the auxiliary board 153 is expanded. The front sides of the vehicle 1 of the first board 153a and the second board 153b of 153 stand up.
As a result, the first board 153a and the second board 153b face the occupant P side.

In addition, the first board 153a and the second board 153b are present above the first bag 133a and the second bag 133b, respectively. Sufficient reaction force can be obtained from In addition, since the soles of the occupant P rest on the second board 153b, the soles can be supported more easily than with the second bag 133b. Therefore, it becomes easier for the occupant P to protect himself against the collision of the vehicle 1, which can be useful for occupant protection.
Also in this embodiment, the third board 153c and the third bag 133c, which contact the occupant P's heel position, may be raised.

(Different operations during collision prediction and collision detection)
Next, a case in which different operations are performed when predicting a collision and when detecting a collision will be described.
Here, the configuration of the occupant protection system will be described using the occupant protection system 33 of the above embodiment. The same operation can be performed by using the configurations of the passenger protection device 31 and the passenger protection device 32 .

When the ECU 203 "detects a collision" of the vehicle 1, the occupant protection device 33 activates the upper body airbag device and the inflator 123 (at high speed). The occupant protection device 33 also activates the upper body airbag device and the inflator 123 when the ECU 203 performs "collision prediction" of the vehicle 1 . However, when the "collision prediction" is performed, the occupant protection device 33 outputs an actuation signal to the inflator 123 to operate at a lower speed than when the "collision detection" is performed. Further, for the upper body airbag device, the output timing of the actuation signal may be determined according to the estimated time until the collision.

For example, when the ECU 202 performs "collision prediction" of the vehicle 1, it detects the heel position of the occupant P and outputs to the inflator 123 an actuation signal for deploying the airbag 133 in front of the heel position. However, the gas of the inflator 123 is intermittently supplied little by little to the air bag 133 to be operated.

As a result, the bag of the airbag 133 rises slowly, and the board of the auxiliary board 153 in front of the heel also rises slowly. Therefore, the occupant P can recognize that the "collision prediction" has been performed, and can quickly prepare to respond to the impact before the collision.

On the other hand, when the ECU 203 "detects a collision" of the vehicle 1, the occupant protection device 33 immediately activates the upper body airbag device and the inflator 123 at high speed (for example, maximum operating speed). The board of the auxiliary board 153 will instantly start up. Therefore, the "collision detection" can make the occupant P take the shock-response posture as soon as possible.

It should be noted that the "slow" (low speed) operating speed for "collision prediction" indicates that the operating speed (high speed) for "collision detection" is slower than the operating speed (high speed) for "collision detection". It is done at a fairly high speed. Also, the high speed at the time of "collision detection" is not a special speed, but a normal speed for general inflators and airbags.
Also in the present embodiment, the third board 153c may be raised by raising the third bag 133c, which hits the heel position of the occupant P.

As described above, the occupant protection system according to the present embodiment deploys the airbag in front of the occupant's heel position, so that the occupant can easily protect himself or herself against a vehicle collision, thereby protecting the occupant. can be done.

1 vehicle, 3 floor mat, 4 roof, 5 floor panel, 10 seat, 11 seat cushion, 12 seat bag, 13 headrest, 20 dashboard, 31, 32, 33, 34 passenger protection device, 40 vehicle camera, 50 top body airbag device 51 upper body airbag body 121, 122, 123 inflator 131, 132, 133 airbag 131a, 132a, 133a first bag 131b, 132b, 133b second bag 131c, 132c, 133c Third bag 131d, 132d, 133d Fourth bag 153 Auxiliary board 153a First board 153b Second board 153c Third board 153d Fourth board 201, 202, 203 Vehicle control unit (ECU)

Claims (4)

a leg position detection device for detecting the front and rear positions of the heels of the legs of an occupant seated on the seat;
an airbag disposed on the floor on which the occupant's heels are placed and having a plurality of air chambers in the longitudinal direction of the vehicle;
a collision detection device for detecting a vehicle collision or collision prediction;
a deployment control device that deploys an air chamber in front of the heel position detected by the leg position detection device in deploying the airbag when the collision detection device detects a collision or a collision prediction;
An occupant protection device for a vehicle, comprising: The deployment control device includes:
The air chamber of the airbag arranged under the heel position is also expanded, and the air chamber in front of the heel position is expanded above the air chamber at the heel position,
The vehicle occupant protection device according to claim 1, characterized in that: The deployment control device includes:
deploying the airbag at a low speed when the collision detection device detects a collision prediction;
deploying the airbag at high speed when the collision detection device detects a collision;
An occupant protection device for a vehicle according to claim 1 or 2, characterized in that: A plurality of auxiliary members separated in the longitudinal direction of the vehicle are provided on the upper part of the airbag,
The auxiliary member corresponding to the air chamber to which the airbag is deployed is rotated in the direction of the seat as the air chamber is deployed.
The vehicle occupant protection device according to any one of claims 1 to 3, characterized in that:

Images