Airbag device

Abstract

To provide an air bag device which suppresses damage of a pedestrian or the like.SOLUTION: An air bag device comprises: an air bag 30 which is developed from a vehicle body front part of a vehicle 1 to a front side; a collision determination part 120 which establishes, when collision possibility is a prescribed threshold value or more, a pre-crash determination; an air bag development control part 110 which instructs an inflator 111 according to the pre-crash determination, and introduces development gas G into the air bag to develop the air bag; and a traction gear 113, 40 in which collision portion with a collision object or its vicinity at the front face part of the air bag is pulled into the vehicle rear side to form a recess C confining the collision object P.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to an airbag device having an airbag that deploys from a front portion of a vehicle body of a vehicle such as an automobile to the outside of the vehicle. [Background technology]

[0002] 2. Description of the Related Art In vehicles such as automobiles, it has been proposed to use airbags that deploy to the outside of the vehicle to reduce injury to pedestrians and the like in the event of a collision. As a technology relating to such an exterior airbag device, for example, Patent Document 1 describes a group of airbags that deploy from multiple locations spaced apart in the vehicle width direction to pinch and restrain pedestrians, etc. Patent Document 2 describes that in an airbag device for protecting pedestrians, a strap (tether) provided within the airbag regulates the shape of the airbag so that the airbag does not expand too far forward. Patent Document 3 describes an airbag device that can be repeatedly deployed and stored, in which a tether provided inside the airbag is pulled when the airbag is stored. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-62938 A [Patent Document 2] JP 2001-322518 A [Patent Document 3] JP 2004-338554 A Summary of the Invention [Problem to be solved by the invention]

[0004] 2. Description of the Related Art There is a demand for reducing damage to pedestrians and cyclists (hereinafter referred to as pedestrians and the like) in the event of a collision between a vehicle and the pedestrians and the like. An object of the present invention is to provide an airbag device which reduces damage to pedestrians and the like. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the airbag device of the present invention is an airbag device including an airbag that deploys forward from a front part of a vehicle body, a collision determination part that establishes a pre-crash determination when the possibility of a collision is equal to or greater than a predetermined threshold, and an airbag deployment control part that issues a command to an inflator in response to the pre-crash determination to supply deployment gas to the airbag to deploy the airbag, and further includes a traction device that tractionally draws the collision point or the vicinity of the collision point with an object of collision on the front part of the airbag toward the rear side of the vehicle to form a recess that restrains the object of collision. The airbag device further includes a collision location estimation unit that estimates a collision location of the object colliding with the airbag, and the towing device selectively tows a part of a plurality of locations distributed on a front surface of the airbag in accordance with the estimation of the collision location. Characterized by . According to this, the impact point or its vicinity on the front part of the airbag is pulled toward the rear of the vehicle and a recess is formed, so that the impact object, such as a pedestrian, is restrained within the recess while the airbag is contracted to absorb energy in a stable state, and the impact object is pushed toward the front of the vehicle to accelerate it, reducing the relative speed between the impact object and the vehicle body and limiting damage to the impact object. Furthermore, by restraining the impact object within the recess, the impact object can be prevented from being thrown forward of the vehicle by the reaction force from the airbag. Also, With this, even if there is variation in the position at which the impact object strikes the front portion of the airbag, the above-mentioned effects can be obtained over a wide range of the front portion of the airbag.

[0007] In order to solve the above-mentioned problems, the airbag device of the present invention is an airbag device including an airbag that deploys forward from a front part of a vehicle body, a collision determination part that establishes a pre-crash determination when the possibility of a collision is equal to or greater than a predetermined threshold, and an airbag deployment control part that issues a command to an inflator in response to the pre-crash determination to supply deployment gas to the airbag to deploy the airbag, and further includes a traction device that tractionally draws the collision point or the vicinity of the collision point with an object of collision on the front part of the airbag toward the rear side of the vehicle to form a recess that restrains the object of collision. The airbag device further includes a vent control unit that controls opening and closing of a vent passage that discharges deployment gas from the airbag, and the vent control unit opens the vent passage when the front portion is towed by the towing device. Characterized by . According to this, the impact point or its vicinity on the front part of the airbag is pulled toward the rear of the vehicle and a recess is formed, so that the impact object, such as a pedestrian, is restrained within the recess while the airbag is contracted to absorb energy in a stable state, and the impact object is pushed toward the front of the vehicle to accelerate it, reducing the relative speed between the impact object and the vehicle body and limiting damage to the impact object. Furthermore, by restraining the impact object within the recess, the impact object can be prevented from being thrown forward of the vehicle by the reaction force from the airbag. Also, This prevents the internal pressure of the airbag from becoming excessively high when the volume of the airbag is reduced by pulling the front portion, and allows the recess to be formed quickly. Furthermore, when an object strikes the airbag, the airbag is contracted while the deployment gas is discharged from the vent passage, thereby enabling energy absorption to be performed effectively. In this case, the vent control portion may be configured to close the vent passage after the collision object is restrained in the recess. According to this, after the collision object is restrained in the recess, the vent flow passage is closed to suppress a decrease in the internal pressure of the airbag, thereby increasing the restraining force for the collision object.

[0008] In order to solve the above-mentioned problems, the airbag device of the present invention is an airbag device including an airbag that deploys forward from a front part of a vehicle body, a collision determination part that establishes a pre-crash determination when the possibility of a collision is equal to or greater than a predetermined threshold, and an airbag deployment control part that issues a command to an inflator in response to the pre-crash determination to supply deployment gas to the airbag to deploy the airbag, and further includes a traction device that tractionally draws the collision point or the vicinity of the collision point with an object of collision on the front part of the airbag toward the rear side of the vehicle to form a recess that restrains the object of collision. The inflator additionally supplies the deployment gas to the airbag after the collision object is restrained in the recess. Characterized by . According to this, the impact point or its vicinity on the front part of the airbag is pulled toward the rear of the vehicle and a recess is formed, so that the impact object, such as a pedestrian, is restrained within the recess while the airbag is contracted to absorb energy in a stable state, and the impact object is pushed toward the front of the vehicle to accelerate it, reducing the relative speed between the impact object and the vehicle body and limiting damage to the impact object. Furthermore, by restraining the impact object within the recess, the impact object can be prevented from being thrown forward of the vehicle by the reaction force from the airbag. Also, According to this, by increasing the internal pressure of the airbag after the recess restrains the collision object, the restraining force can be strengthened, thereby promoting the above-mentioned effect. Effect of the Invention

[0009] As described above, according to the present invention, it is possible to provide an airbag device that reduces injury to pedestrians and the like. [Brief description of the drawings]

[0010] [Figure 1] 1 is a diagram showing a schematic configuration of an embodiment of an airbag device to which the present invention is applied; [Diagram 2] 1 is a schematic diagram showing a structure of an airbag in an airbag device according to an embodiment; [Diagram 3] 1 is a block diagram showing a schematic configuration of a system for controlling an airbag device according to an embodiment; [Figure 4] 5 is a flowchart illustrating an operation of the airbag device of the embodiment during a collision. [Diagram 5] 1 is a diagram showing a schematic diagram of a state after a vehicle having an airbag device according to an embodiment collides with a pedestrian; [Figure 6] 1 is a diagram showing a state in which a vehicle having an airbag device according to an embodiment collides with a pedestrian and completes restraint by the airbag. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of an airbag device to which the present invention is applied will be described. The airbag device of the embodiment is provided, for example, in the front of a vehicle such as a passenger car, and is intended to provide protection (reduction of damage) in the event of a collision with a human body such as a pedestrian or a bicycle rider. FIG. 1 is a diagram showing a schematic configuration of an airbag device according to an embodiment. FIG. 1 shows a vehicle having an airbag device according to an embodiment as viewed from above. The vehicle 1 has, for example, a so-called two-box vehicle shape having an engine compartment 20 that protrudes forward from a passenger compartment 10 .

[0012] The vehicle interior 10 is a portion having a space in which passengers and the like are accommodated. The engine compartment 20 is a portion having a space in which power train components such as an engine, a transmission, and in the case of an electric vehicle, a motor generator and its control devices are housed. The engine compartment 20 is provided with a front side frame 21, a bumper beam 22, a front bumper 23, etc.

[0013] The front side frame 21 is a structural member that protrudes forward from a toe board (not shown), which is a partition wall provided at the front end of the passenger compartment 10, toward the front of the vehicle. The front side frame 21 functions as a base to which, for example, a power train, a cross member to which a front suspension is attached, and a strut housing that accommodates a strut of a MacPherson strut type front suspension are attached. The front side frame 21 is formed by assembling and welding members formed by press-molding steel plates, for example, so that its cross-sectional shape when viewed from the vehicle front-rear direction is a rectangular closed cross-section.

[0014] The bumper beam 22 is a structural member provided at the front of the vehicle body and extending in the vehicle width direction. The bumper beam 22 is formed into a beam shape with a closed cross section by, for example, assembling and welding members formed by press-molding steel plates, or by using an extruded aluminum alloy material. The bumper beam 22 has a middle portion connected to the front end portions of the left and right front side frames 21 . Both ends of the bumper beam 22 in the vehicle width direction protrude outward in the vehicle width direction relative to the front side frames 21. The bumper beam 22 is a load transmitting member that transmits the load received by an airbag 30 (described later) from a human body or object that it collides with, via the front side frames 21, to the rear side of the vehicle body.

[0015] The front bumper 23 is an exterior member provided at the front end of the vehicle body, and is configured by attaching a bumper face constituting a skin portion formed from, for example, a PP-based resin to the vehicle body with brackets or the like (not shown). The front portion of the front bumper 23 is curved so that the front side of the vehicle 1 is convex when the vehicle 1 is viewed from above. The bumper beam 22 is formed in an arc shape that is convex toward the front of the vehicle so as to follow the curvature of the front portion of the front bumper 23 when the vehicle 1 is viewed from above.

[0016] The airbag device of the embodiment includes an airbag 30 which will be described below. The airbag 30 is formed into a bag shape by joining panels made of a base fabric such as nylon 66 fabric. The airbag 30 is deployed and further inflated by introduction of deployment gas generated by an inflator 111 in response to the establishment of a pre-crash determination, which will be described later. The airbag 30 deploys toward the front side of the vehicle from a center portion in the vehicle width direction at the front end of the vehicle body. The airbag 30 is normally attached to the bumper beam 22 in a folded state (before the pre-crash determination is established), and is housed inside the front bumper 23. In the event of a collision, the airbag 30 breaks a weakened portion formed in the front bumper 23 and is deployed toward the front side of the vehicle, and deploys forward relative to the front surface of the front bumper 23.

[0017] FIG. 2 is a schematic diagram showing the structure of an airbag in the airbag device of the embodiment. 2 shows the front part of the vehicle 1 as seen from above (the same applies to FIGS. 5 and 6, which will be described later). A tether 40 is provided inside the airbag 30. The tether 40 pulls the front portion of the airbag 30, which comes into contact with an object of impact such as a pedestrian, from inside the airbag 30 toward the rear of the vehicle during a collision with the object of impact, thereby regulating the shape of the airbag 30 after it is deployed. The tether 40 is formed, for example, into a flexible band shape by a base fabric panel. The front end of tether 40 is connected to the inside surface of the front portion of airbag 30, for example by sewing, welding, or the like. The rear end of the tether 40 is connected to a tether pulling device 113, which will be described later.

[0018] The tethers 40 are provided at a front end of the airbag 30 at a plurality of locations (for example, five locations in the case of FIG. 2) that are distributed in the vehicle width direction. The rear end of the tether 40 is connected to a single tether puller 113 . In the case of Figs. 1 and 2, the tethers 40 are arranged radially in the vehicle width direction on the front side of the vehicle.

[0019] FIG. 3 is a block diagram showing a schematic configuration of a system for controlling the airbag device of the embodiment. The system for controlling the airbag device comprises an airbag control unit 110, an environment recognition unit 120, and the like. Each of these units can be configured as a microcomputer having, for example, an information processing unit (processor) such as a CPU, a storage unit such as a RAM or a ROM, an input / output interface, and a bus connecting these. In addition, each unit is connected directly or via an in-vehicle LAN such as a CAN communication system, so that they can communicate with each other.

[0020] The airbag control unit 110 issues commands to and controls the inflator 111, the vent control valve 112, and the tether pulling device 113, thereby inflating the airbag 30 and controlling the state of deployment. The airbag control unit 110 functions as the airbag deployment control unit of the present invention. The inflator 111 is a chemical (pyrotechnic) gas generating device that generates a deployment gas G for deploying the airbag 30 in response to a command from the airbag control unit 110. The inflator 111 is a multi-stage inflator capable of generating the deployment gas G multiple times at time intervals.

[0021] The vent control valve 112 opens and closes a vent passage (not shown) for discharging the deployment gas G from within the airbag 30 (for example, opening it to the atmosphere) in response to a command from the airbag control unit 110. The vent control valve 112 may, for example, comprise a solenoid valve.

[0022] The tether pulling device 113, in response to a command from the airbag control unit 110, winds up the rear end of the tether 40 and pulls the front part of the airbag 30 toward the rear of the vehicle by the tether 40. The tether pulling device 113 has a function of selectively pulling a portion (a group) of the plurality of tethers 40. The tether pulling device 113 may be configured to have an actuator, such as a chemical or electric actuator. The tether pulling device 113 has a function of locally pulling the front portion of the airbag 30, thereby forming a recess C (see Figs. 5 and 6) in which the front portion is recessed toward the rear side of the vehicle.

[0023] The airbag control unit 110 is provided with a pressure sensor 114 . The pressure sensor 114 has a function of detecting the pressure (internal pressure) of the deployment gas G inside the airbag 30. The airbag control unit 110 can detect the input state of the load to the airbag 30 based on the output of the pressure sensor 114 . The inflator 111, the vent control valve 112, the tether pulling device 113, and the pressure sensor 114 described above can be configured to be provided, for example, in a retainer R which is a container that houses the airbag 30 in a stored state.

[0024] The environment recognition unit 120 recognizes the environment around the vehicle based on the outputs of various sensors. The environment recognition unit 120 has a function of recognizing, for example, various objects such as pedestrians, cyclists, and other human bodies around the vehicle 1 (host vehicle), other vehicles, buildings, trees, and terrain, road shapes (lane shapes), and the like. The environment recognition unit 120 functions as a collision judgment section that makes a pre-crash judgment when a collision with a human body, such as a pedestrian, a cyclist, or a motorcycle rider, or an object other than a human body, such as another vehicle, is unavoidable (when the possibility of collision is greater than or equal to a predetermined level). The environment recognition unit 120 is connected to a stereo camera device 121, a millimeter wave radar device 122, a laser scanner device 123, and the like.

[0025] The stereo camera device 121 has a pair of cameras arranged at a predetermined distance (baseline length) apart, and has the function of recognizing, for example, human bodies such as pedestrians and cyclists, and objects such as other vehicles and buildings, and also detecting the relative positions of human bodies, objects, etc. with respect to the vehicle 1 by known stereo image processing. The stereo camera device 121 has a function of recognizing the attributes of a subject by, for example, pattern recognition of a captured image. For example, in the case of a human body such as a pedestrian, the system has a function for recognizing the physique, estimated weight, posture, and the like.

[0026] The millimeter wave radar device 122 is a radar device that uses radio waves in a frequency band of, for example, 30 to 300 GHz, and has the function of detecting the presence or absence of a human body, object, etc., and the relative position of the human body, object, etc. with respect to the vehicle 1. The laser scanner device (LIDAR) 123 has the function of scanning the surroundings of the vehicle 1, for example by emitting pulsed near-infrared laser light, and detecting the presence or absence of human bodies, objects, etc., and the relative positions and shapes of human bodies, objects, etc. in relation to the vehicle 1 based on the presence or absence of reflected light and the time difference until the reflected light returns. The environmental recognition unit 120 is capable of recognizing the type of collision with a human body, object, etc. (e.g., the velocity vector of the collision object relative to vehicle 1, the collision position relative to vehicle 1, etc.) and the attributes of the collision object (the physique of the human body, the model of the other vehicle, etc.) when a collision with a human body such as a pedestrian or an object such as another vehicle is unavoidable (when a pre-crash judgment is established).

[0027] Next, the operation of the airbag device of the embodiment will be described. FIG. 4 is a flowchart illustrating the operation of the airbag device of the embodiment during a collision. Each step will be explained in order below.

[0028] <Step S01: Pre-crash determination> The environment recognition unit 120 uses known pre-crash judgment logic to estimate the possibility of a collision between the vehicle 1 and a collision object approaching from the front of the vehicle 1, such as a pedestrian or a cyclist, and determines whether the estimated possibility is equal to or exceeds a preset threshold. If the possibility of a collision occurring is equal to or greater than the threshold, it is determined that a collision is unavoidable, a pre-crash determination is established, and the process proceeds to step S02; otherwise, the series of processes ends.

[0029] <Step S02: Airbag deployment begins / vent control valve close> The airbag control unit 110 issues a command to the inflator 111 to generate deployment gas, which is then introduced into the airbag 30 to start the deployment of the airbag 30. At this time, the airbag control unit 110 closes the vent control valve 112 in order to quickly deploy the airbag 30. Then, proceed to step S03.

[0030] <Step S03: Determining whether airbag deployment is complete> The airbag control unit 110 determines whether the airbag 30 has expanded to a predetermined volume based on the output of the pressure sensor 114 or the like. If it is determined that the airbag 30 has been deployed to the predetermined volume, it is assumed that the deployment of the airbag 30 has been completed and the process proceeds to step S04; otherwise, step S03 is repeated.

[0031] <Step S04: Collision prediction location determination> The environment recognition unit 120 determines a location (predicted collision location) at the front of the airbag 30 where a collision object such as a pedestrian is predicted to collide, based on outputs from various sensors such as the stereo camera device 121. Thereafter, the environment recognition unit 120 transmits information regarding the predicted collision location to the airbag control unit 110, and the process proceeds to step S05.

[0032] <Step S05: Collision predicted location tether pull / vent control valve open> The airbag control unit 110 issues a command to the tether pulling device 113 to wind up the tether 40 connected to the predicted collision location and its vicinity on the front part of the airbag 30, and pull the front part of the airbag 30 toward the rear of the vehicle. At this time, the airbag control unit 110 opens the vent control valve 112 to prevent the internal pressure of the airbag 30 from becoming excessively high due to traction of the frontal portion. Then, proceed to step S06.

[0033] <Step S06: Determination of Restraint of Collision Object> The airbag control unit 110 determines whether or not a collision object such as a pedestrian has entered and been pinched and restrained in a recess in the front part of the airbag 30 formed by pulling the tether 40 in step S05. The determination of whether the impact object has been restrained can be made based on, for example, the history of the internal pressure of the airbag 30 detected by the pressure sensor 114 or the results of monitoring the position of the impact object by the stereo camera device 121. If it is determined that the collision object has penetrated into the airbag 30 to a predetermined depth and restraint has been achieved, the process proceeds to step S07; otherwise, step S06 is repeated.

[0034] <Step S07: Close the deployment gas additional supply / vent control valve> The airbag control unit 110 issues a command to the inflator 111 to supply additional gas to the airbag 30 for deployment. Additionally, the airbag control unit 110 closes the vent control valve 112 . Then, the series of processes ends.

[0035] Hereinafter, a state transition during a pedestrian collision and the operation and effect of the airbag device of the embodiment will be described. First, in response to the establishment of a pre-crash determination with respect to a pedestrian or the like, the airbag 30 deploys to the state shown in FIG. In this state, each tether 40 is at a preset initial length, and is not being pulled by the tether pulling device 113. As a result, the front portion of the airbag 30 facing the pedestrian P or the like has a gently curved surface that protrudes forward of the vehicle.

[0036] After the airbag 30 has been deployed, a predicted collision location with an object to be hit (pedestrian P as an example) is determined, and the tether 40 connected to the predicted collision location and its vicinity is pulled by the tether pulling device 113. FIG. 5 is a schematic diagram showing a state after a vehicle having the airbag device of the embodiment collides with a pedestrian. In the example shown in FIG. 5, a state is shown in which a pedestrian P collides with a front portion of the airbag 30 at the center in the vehicle width direction. At this time, tether pulling device 113 pulls one tether in the center and each of the two tethers adjacent to the center on the left and right of tether 40, of which five tethers are arranged in the horizontal direction. As a result, a recess C for receiving a pedestrian P is formed in the front portion of the airbag 30. FIG. 5 shows a state in which a pedestrian P has entered the recess C.

[0037] When the pedestrian P sinks into the recess C to a predetermined depth, it is determined that the restraint is complete, and the airbag control unit 110 closes the vent control valve 112 and causes the inflator 111 to supply additional deployment gas G. FIG. 6 is a diagram showing a state in which a vehicle having the airbag device of the embodiment collides with a pedestrian and completes restraint by the airbag. In this state, the internal pressure of the airbag 30 increases, and the airbag 30 presses and clamps the pedestrian P in the recess C, restraining him or her.

[0038] As described above, according to this embodiment, the following effects can be obtained. (1) By pulling the impact point or its vicinity on the front part of the airbag 30 toward the rear of the vehicle and forming a recess C, the airbag 30 is contracted while restraining the impact object such as a pedestrian P within the recess C, thereby absorbing energy in a stable state, and pushing the pedestrian P toward the front of the vehicle to accelerate it, thereby reducing the relative speed between the pedestrian P and the vehicle body and limiting damage to the pedestrian P. Furthermore, by restraining the pedestrian P or the like within the recess C, the pedestrian P or the like can be prevented from being thrown forward of the vehicle by the reaction force received from the airbag 30. (2) The tether pulling device 113 selectively pulls only the tether 40 connected to the predicted collision location and the adjacent area on the front part of the airbag 30, so that the above-mentioned effect can be obtained over a wide area of ​​the front part even if there is variation in the collision location of a pedestrian P or the like with the front part of the airbag 30. (3) By opening the vent control valve 112 when the tether 40 is towed by the tether towing device 113, the internal pressure of the airbag 30 can be prevented from becoming excessively high when the volume of the airbag 30 decreases, and the recess C can be formed quickly. (4) By closing the vent control valve 112 after restraining the pedestrian P or the like in the recess C of the airbag 30, the decrease in internal pressure of the airbag 30 can be suppressed, thereby increasing the restraining force for the pedestrian P or the like. (5) After restraining a pedestrian P or the like within the recess C of the airbag 30, additional supply of deployment gas G by the inflator 111 can be made to increase the internal pressure of the airbag 30, strengthening the restraining force and promoting the above-mentioned effects.

[0039] (Modification) The present invention is not limited to the above-described embodiment, and various modifications and variations are possible, which are also within the technical scope of the present invention. (1) The configurations of the airbag device and the vehicle are not limited to the above-described embodiment, and may be modified as appropriate. For example, the structure, shape, material, manufacturing method, arrangement, and number of each member and part that constitutes these, as well as the specific contents of various controls, are not limited to the embodiments and can be changed as appropriate. (2) The method of performing the pre-crash determination and the method of determining the type of collision are not limited to the methods described in the respective embodiments and may be modified as appropriate. (3) The number and arrangement of the tethers provided in the airbag and the configuration of the tether pulling device are not limited to the configurations of the above-described embodiments and may be modified as appropriate. For example, in the embodiment, five tethers are arranged radially in a horizontal plane, but the arrangement of the tethers is not limited to radially and may be other arrangements, such as parallel arrangements, and the number of tethers can be increased or decreased as appropriate. Furthermore, multiple tethers may be arranged in a distributed manner in the vertical direction. [Explanation of symbols]

[0040] 1 car 10 compartments 20 Engine compartment 21 Front side frame 22 Bumper beam 23 Front bumper 30 Airbag 40 Tether 110 Airbag control unit 111 Inflator 112 Vent control valve 113 Tether towing device 114 Pressure sensor 120 Environmental recognition unit 121 Stereo camera device 122 Millimeter wave radar device 123 Laser scanner device G Deployment gas C Depression P Pedestrian R retainer

Claims

1. An airbag that deploys forward from a front part of a vehicle body, a collision determination unit that establishes a pre-crash determination when the possibility of a collision is equal to or greater than a predetermined threshold; an airbag deployment control unit that issues a command to an inflator in response to the pre-crash determination to supply deployment gas to the airbag and deploy the airbag; An airbag device comprising: a traction device for towing a collision point or a vicinity of the collision point on the front part of the airbag with an object to the rear of the vehicle to form a recess for restraining the object to be hit; The airbag device further includes a collision location estimation unit that estimates a collision location of the collision object with the airbag, The towing device selectively tows a part of a plurality of locations distributed on a front portion of the airbag in accordance with the estimated collision location. An airbag device comprising:

2. An airbag that deploys forward from a front part of a vehicle body, a collision determination unit that establishes a pre-crash determination when the possibility of a collision is equal to or greater than a predetermined threshold; an airbag deployment control unit that issues a command to an inflator in response to the pre-crash determination to supply deployment gas to the airbag and deploy the airbag; An airbag device comprising: a traction device for towing a collision point or a vicinity of the collision point on the front part of the airbag with an object to the rear of the vehicle to form a recess for restraining the object to be hit; The airbag device further includes a vent control unit that controls opening and closing of a vent passage that discharges deployment gas from the airbag, The vent control unit opens the vent passage when the front portion is towed by the towing device. An airbag device comprising:

3. The vent control section closes the vent passage after the collision object is restrained in the recess.

3. The airbag device according to claim 2, wherein:

4. An airbag that deploys forward from a front part of a vehicle body, a collision determination unit that establishes a pre-crash determination when the possibility of a collision is equal to or greater than a predetermined threshold; an airbag deployment control unit that issues a command to an inflator in response to the pre-crash determination to supply deployment gas to the airbag and deploy the airbag; An airbag device comprising: a traction device for towing a collision point or a vicinity of the collision point on the front part of the airbag with an object to the rear of the vehicle to form a recess for restraining the object to be hit; The inflator additionally supplies the deployment gas to the airbag after the collision object is restrained in the recess. An airbag device comprising:

Images