JP2008230503A - Collision detection means, pedestrian collision detection means, and pedestrian protection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a collision detection means superior in assembling property. <P>SOLUTION: The collision detection means has a bumper reinforcement 1 fixed to a side member of a vehicle; an absorber 2 arranged at a front side in a vehicle advancement direction of the bumper reinforcement 1; a chamber member 3 for partitioning an approximately sealed chamber space 30 arranged at a front side in the vehicle advancement direction of the bumper reinforcement 1; and a pressure sensor 4 for detecting a pressure of the chamber space 30. The chamber member 3 is arranged at an outside of the absorber 2, and the absorber 2 and the chamber 3 are arranged so as to be positioned at a position relationship that at least a part of width in a vehicle longitudinal direction of the shock absorber 2 and at least a part of width in the vehicle longitudinal direction of the chamber member 3 are overlapped with each other in a vehicle vertical direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a collision detection unit that is attached to a vehicle and detects a collision of a colliding object with the vehicle, and more particularly, to a collision detection unit that detects a collision object against a bumper of the vehicle.

  In recent years, safety has been improved in vehicles in the event of an accident. Regarding vehicle safety, not only is it necessary to ensure the safety of the vehicle occupant in the event of an accident, but it has also been required that the pedestrian not be fatally damaged when the pedestrian collides with the vehicle.

  As a protection means for protecting a pedestrian that has collided with a vehicle, there is a method of reducing an injury value (impact received by a pedestrian) received by a pedestrian who collides with the vehicle and falls into the bonnet, such as an airbag deployed on a hood is there. By reducing the impact of pedestrians on airbags, pedestrians can be prevented from receiving fatal damage.

  In such a protective device, it is important to detect a collision with a vehicle such as a pedestrian.

  As a conventional means for detecting a collision with a vehicle, for example, a chamber member that divides the chamber space is disposed in front of a bumper reinforcement that constitutes a bumper of the vehicle, and the vehicle is detected from a change in pressure in the chamber space. A collision detection means for detecting a collision with a bumper is known. In the vehicular bumper in which the collision detection means is installed, the chamber member is arranged inside the absorber fixed to the bumper reinforcement.

  However, the collision detection means having such a configuration has a problem that its assembly is difficult. Specifically, the bumper reinforcement is made of metal, and when the absorber is also made of metal, the absorber is fixed to the bumper reinforcement by welding. In order to arrange the chamber member inside the absorber, it is necessary to weld the absorber and then insert the absorber into the absorber, or to weld the absorber in a state where the chamber member is arranged. However, the chamber member is deformed when a load due to a collision is applied, and is formed of a soft material that can return to its original shape when the load is no longer applied, and is damaged when a welding operation or the like is performed. There is a fear. For this reason, it is necessary to join the bumper reinforcement and the absorber with bolts or the like, resulting in a complicated work process.

  There is also a method of manufacturing the absorber with an elastic material such as foamed resin. In such a configuration, the chamber member is assembled in front of the absorber or between the absorber and the bumper reinforcement. In such a configuration, there is a problem that the stroke amount that can be secured by the absorber is reduced by the chamber member.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the collision detection means excellent in the assembly | attachment property.

  In order to solve the above-mentioned problems, the present inventors have studied the collision detection means that can be assembled to the bumper of the vehicle, and as a result, have reached the present invention.

  The collision detection means of the present invention is arranged in a bumper reinforcement fixed to a side member of the vehicle, an absorber arranged in front of the bumper reinforcement in the vehicle traveling direction, and in front of the bumper reinforcement in the vehicle traveling direction. A collision detection means for detecting a collision between the vehicle and another object from a change in pressure in the chamber space, the chamber member defining a substantially sealed chamber space, and a pressure sensor for detecting the pressure in the chamber space The chamber member is disposed outside the absorber, and the absorber and the chamber have at least a part of the width of the absorber in the vehicle front-rear direction and at least a part of the width of the chamber member in the vehicle front-rear direction in the vehicle vertical direction. It arrange | positions so that it may be in the positional relationship which mutually overlaps.

  The pedestrian collision detection means according to the present invention receives the collision detection means according to any one of claims 1 and 2 and an output signal of the collision detection means, and whether the collision object is a pedestrian based on the output signal. A collision determination means for performing the determination.

  A pedestrian protection system according to the present invention includes a pedestrian collision detection unit according to claim 3 and a protection unit that protects a pedestrian when the pedestrian collision detection unit determines that a pedestrian collision has occurred. It is characterized by that.

  In the collision detection means of the present invention, the absorber and the chamber are in a positional relationship in which at least a part of the width of the absorber in the vehicle front-rear direction and at least a part of the width of the chamber member in the vehicle front-rear direction overlap each other in the vehicle vertical direction. Thus, the chamber member can be assembled in a state where the absorber is assembled to the bumper reinforcement. That is, the collision detection means of the present invention is a collision detection means excellent in assemblability.

  Furthermore, since the collision detection means of the present invention is disposed in the space formed above and / or below the absorber, the chamber member can be disposed without changing the shape of the absorber, A sufficient amount of deformation of the absorber can be secured. That is, the impact received by the collision object can be reduced.

  Moreover, the pedestrian collision detection means of this invention is a detection means which determines whether a collision object is a pedestrian using said collision detection means. That is, the collision detection means excellent in collision detection accuracy is used, and the pedestrian detection means is suppressed from malfunction due to erroneous detection.

  The protection system of the present invention is a protection system using the above-described collision detection means. In other words, the collision detection means having excellent collision detection accuracy is used, and the protection system is configured to suppress malfunction due to erroneous detection.

(Collision detection means)
The collision detection means of the present invention is arranged in a bumper reinforcement fixed to the side member of the vehicle, an absorber disposed in front of the bumper reinforcement in the vehicle traveling direction, and in front of the bumper reinforcement in the vehicle traveling direction. And a chamber member that partitions the substantially sealed chamber space, and a pressure sensor that detects the pressure of the chamber space, and detects a collision between the vehicle and another object from a change in the pressure of the chamber space. That is, the collision detection means of the present invention detects a collision by detecting, with a pressure sensor, a pressure variation in the chamber space that occurs when a collision object collides with the vehicle. In the present invention, directions such as front, rear, upper, and lower indicate directions in a vehicle in which the collision detection means is assembled.

  In the collision detection means of the present invention, the chamber member is disposed outside the absorber. Since the chamber member is disposed outside the absorber, the chamber member can be disposed (assembled) in a state where the absorber is assembled to the bumper reinforcement, and the assembling property is improved.

  Furthermore, the collision detection means of the present invention does not need to change the shape of the absorber in order to arrange the chamber member, and has a structure that can sufficiently exhibit the interference action of the absorber. As a result, the shock absorbing action by the absorber is improved, and the impact received by the collision object can be reduced.

  In the collision detection means of the present invention, the absorber and the chamber are in a positional relationship in which at least part of the width of the absorber in the vehicle front-rear direction and at least part of the width of the chamber member in the vehicle front-rear direction overlap each other in the vehicle vertical direction. Are arranged as follows. That is, the absorber and the chamber member are in a state where at least a part thereof overlaps in the vertical direction of the vehicle, and the absorber and the chamber member are not arranged in the load direction at the time of collision. For this reason, the rigidity of the absorber does not directly affect the deformation of the chamber member. As a result, since the absorber can exhibit its rigidity, the chamber member can be formed of a material having a high shape restoring property. This means that after the collision, the repair is completed only by replacing the absorber without replacing the chamber member, and the effect of reducing the repair cost is exhibited.

  In the collision detection means of the present invention, it is sufficient that at least a part of the width of the absorber in the vehicle front-rear direction and at least a part of the width of the chamber member in the vehicle front-rear direction overlap with each other in the vehicle vertical direction. What is necessary is just the form by which the member is arrange | positioned at least one of the upper direction or the downward direction of an absorber.

  The chamber member is preferably disposed above the absorber. Since the chamber member is disposed above the absorber, the absorber can absorb the impact of the collision on the lower side of the bumper, and is particularly effective in protecting the pedestrian's legs. Further, by arranging the chamber member on the upper side of the absorber, the accuracy of determining whether the collision object is a fixed object or a pedestrian (human body) is improved.

  In the collision detection means of the present invention, it is preferable that the overlap of the chamber member and the absorber in the vehicle front-rear direction is performed over the entire length in the vehicle width direction. In this embodiment, the chamber member can be disposed over the entire length in the width direction of the vehicle, and a collision can be detected over the entire length in the width direction. That is, the collision detection accuracy is improved.

  The collision detection means of the present invention preferably has a plurality of chamber members arranged in the width direction of the vehicle. When having a plurality of chamber members, each chamber member preferably has a pressure sensor. By having a plurality of chamber members, each chamber member can detect a collision, and the collision detection accuracy is improved. Here, the adjacent chamber members among the plurality of chamber members may be in contact with each other or in a state of being spaced apart.

  The collision detection means of the present invention preferably has a plurality of absorbers arranged in the width direction of the vehicle. By having a plurality of absorbers, it is possible to adjust the ease of crushing of each absorber, and it is possible to improve protection performance such as leg protection for pedestrians.

  The collision detection means of the present invention has chamber members arranged at predetermined positions, and each member (bumper reinforcement, absorber, chamber member and pressure sensor) constituting the collision detection means is a conventionally known collision detection. The member used in the means can be used.

  Moreover, it is preferable that the collision detection means of this invention has a bumper cover. The bumper cover forms the outer surface of the vehicle bumper assembled with the collision detection means of the present invention. In the collision detection means of the present invention, the front surfaces of the absorber and the chamber member and the bumper cover may be arranged in a state of being spaced apart or in a state of being in contact with each other. .

  The collision detection means of the present invention is effective in detecting a collision object to the bumper of the vehicle to be assembled, but it is preferable to detect a pedestrian collision with the vehicle bumper.

  The collision detection means of the present invention preferably has a calculation means for determining the pressure fluctuation in the chamber space from the detection signal from the pressure sensor and determining the collision. By having the calculation means, not only can collisions be determined, but also collision objects can be determined from pressure fluctuations during the collision. And when it determines with it being a pedestrian, an operation signal can be emitted to the pedestrian protection means provided outside the vehicle.

(Pedestrian collision detection means)
The pedestrian collision detection means according to the present invention receives the collision detection means according to any one of claims 1 and 2 and an output signal of the collision detection means, and whether the collision object is a pedestrian based on the output signal. A collision determination means for performing the determination.

  The pedestrian collision detection means of the present invention is a pedestrian collision detection means using the collision detection means according to claim 1 or 2. In the pedestrian collision detection means of the present invention, the pressure sensor of the collision detection means detects a change in the pressure of the chamber space at the time of the collision and generates an output signal.

  The output signal is input to the collision determination means, and it is determined whether or not the collision object is a pedestrian. A conventionally known determination method can be used to determine the collision object in the collision determination means.

  As described above, since the collision detection means is excellent in collision detection performance, and the collision object is determined based on the output signal from the collision detection means, the detection means of the present invention is a pedestrian collision detection with excellent collision detection accuracy. It is a means.

(Protection system)
The protection system of this invention has a pedestrian collision detection means of Claim 3, and a protection means which protects a pedestrian when a pedestrian collision detection means determines with a pedestrian collision.

  That is, when the collision determination unit determines that the collision object is a pedestrian, the protection system of the present invention transmits an activation signal for the activation unit to activate the protection unit from the determination result to the protection unit. In the present invention, the collision determination unit and the activation unit may be one arithmetic unit (ECU or the like).

  The protection means that has received the activation signal operates and protects the pedestrian. The protection means is a conventionally known protection means such as an air bag.

  Hereinafter, the present invention will be described using examples.

  As an example of the present invention, a collision detection means was manufactured.

(Example 1)
The collision detection means of the present embodiment has a configuration including a bumper reinforcement 1, an absorber 2, a chamber member 3, a pressure sensor 4, a bumper cover 5, and calculation means (not shown). The structure of the collision detection means of a present Example was shown to FIGS. 1 is a top view of the collision detection means of the present embodiment, and FIG. 2 is a cross-sectional view showing a cross section taken along the line II of FIG. In FIG. 1, the length of the chamber member 3 in the front-rear direction of the vehicle is shown short so that the arrangement of the absorber 2 and the chamber member 3 can be understood.

  The bumper reinforcement 1 is a substantially strip-shaped metal plate whose surface faces the front of the vehicle. The bumper reinforcement 1 is fixed to the pair of front side members Fm in a state where the extending direction of the band extends along the width direction of the vehicle. The bumper reinforcement 1 is bent into a shape in which a central portion in the vertical direction protrudes forward of the vehicle to form a protrusion 10 so that a cross section in the vehicle vertical direction is convex toward the front of the vehicle. Yes. The protrusion 10 is formed in a state of spreading in the vehicle vertical direction. In the bumper reinforcement 1, the protruding portion 10 is fixed to the front side member Fm. The front side member Fm of the vehicle to which the bumper reinforcement 1 is fixed is a pair of members protruding forward of the engine room of the vehicle.

  The absorber 2 is a substantially cylindrical member that is fixed to the lower side of the front surface 10a of the protruding portion 10 of the bumper reinforcement 1 and that has an axial direction arranged along the width direction of the vehicle. In a state where the absorber 2 is fixed, a part of the front surface of the bumper reinforcement 1 near the upper end is exposed. The absorber 2 is formed in a shape in which the surface (front surface) facing away from the bumper reinforcement 1 coincides with the inner peripheral surface of the bumper cover 5 of the vehicle bumper. In this embodiment, the absorber 2 may have a substantially box shape with both ends closed.

  The chamber member 3 is a substantially box-shaped member having a chamber space 30 defined therein. The substantially box-shaped member is disposed and fixed in front of the bumper reinforcement 1 and above the absorber 2.

  The pressure sensor 4 is a sensor for measuring the pressure of the chamber space 30 of the chamber member 3 and is assembled to the chamber member 3.

  The bumper cover 5 is a member that forms the surface of the bumper of the vehicle that is disposed in contact with the front surface of the absorber 2. In the present embodiment, the bumper cover 5 is not in contact with the front surface of the chamber member 3.

  The computing means is connected to the pressure sensor 4 and calculates the pressure of the chamber space 30 from the detection signal of the pressure sensor 4 and determines a collision from the calculated pressure. The calculation means may be a calculation means mounted in advance on the vehicle. Preferably, it is an arithmetic means of an occupant protection device or a pedestrian protection device.

  As shown in FIG. 2, the collision detection means of the present embodiment includes a bumper reinforcement 1, an absorber 2, a chamber member 3, a pressure sensor 4, a bumper cover 5, and a calculation means (not shown). The chamber member 3 is disposed in a space defined by the bumper reinforcement 1, the absorber 2, and the bumper cover 5 (a space formed in front of the upper end portion of the bumper reinforcement 1). Have. Further, in the collision detection means of this embodiment, the chamber member 3 is outside the absorber 2, and the width of the absorber 2 in the vehicle front-rear direction and the width of the chamber member 3 in the vehicle front-rear direction overlap each other in the vehicle vertical direction.

  The collision detection means of the present embodiment is configured such that the bumper cover 5 is mounted with the chamber member 3 having the pressure sensor 4 assembled at a predetermined position above the absorber 2 by welding the absorber 2 to the bumper reinforcement 1 by welding. It was possible to manufacture by assembling. That is, the collision detection means of this embodiment could be easily assembled.

  The collision detection by the collision detection means of the present embodiment will be described below.

  When a collision object collides with the bumper of this vehicle, the collision object presses the bumper (bumper cover 5) of the vehicle. The bumper cover 5 is deformed in the direction in which the bumper is compressed, and presses the absorber 2. And the absorber 2 produces a deformation | transformation. As the deformation of the absorber 2 proceeds, the bumper cover 5 contacts the chamber member 3 and deforms the chamber member 3.

  Due to the deformation of the chamber member 3, the pressure inside the chamber space 30 rises, the pressure sensor 4 measures the change in pressure, and the calculation means detects the change in pressure. And a calculating means determines with the collision object having collided with the vehicle from the change (rise) of the pressure. Further, the calculation means can determine whether the collision object is a human body such as a pedestrian or the like or a hard structure such as another vehicle from the degree of change (change ratio) of the pressure. At this time, it is preferable that vehicle speed data is also input to the calculation means.

(Example 2)
The present embodiment is a collision detection means having the same configuration as that of the first embodiment, except that the chamber member 3 includes three chamber members 3a, 3b, and 3c. FIG. 3 shows the configuration of this embodiment. FIG. 3 is a cross-sectional view of a plane extending in the horizontal direction across the three chamber members 3a, 3b, 3c. Also in the present embodiment, the lengths of the three chamber members 3a, 3b, 3c in the front-rear direction of the vehicle are displayed short as in the case of FIG. 1 of the first embodiment.

  Each of the three chamber members 3a, 3b, 3c is a substantially box-shaped member having chamber spaces 30a, 30b, 30c partitioned therein. The substantially box-shaped member was fixed and arranged in front of the bumper reinforcement 1 and above the absorber 2 in a state of being aligned in the width direction of the vehicle. The three chamber members 3a, 3b, 3c are formed in contact with adjacent chamber members without any gaps.

  Each of the three chamber members 3a, 3b, 3c is provided with pressure sensors 4a, 4b, 4c for measuring the pressure in the chamber spaces 30a, 30b, 30c.

  The present embodiment is a collision detection unit similar to that of the first embodiment except that the shape of the chamber member is different, and exhibits the same effect. Furthermore, the collision detection means of the present embodiment exhibits an effect that the collision position can be obtained by comparing pressure fluctuations in the chamber spaces 30a, 30b, and 30c of the three chamber members 3a, 3b, and 3c.

(Example 3)
The present embodiment is a collision detection unit having the same configuration as that of the first embodiment except that the absorber 2 is made of foamed resin. FIG. 4 is a sectional view showing the configuration of this example.

  The present embodiment is the same collision detection unit as that of the first embodiment except that the material of the absorber 2 is different, and exhibits the same effect. In the present embodiment, the foamed resin constituting the absorber has lower rigidity than the case of being made of metal, so that the absorber absorbs the impact of the collision of the collision object, and exhibits the effect of reducing the impact received by the collision object. .

Example 4
The present embodiment is the same as the first embodiment except that the absorber 2 is fixed to the central portion of the front surface of the protruding portion 10 of the bumper reinforcement 1 and the chamber member 3 is composed of two chamber members 3d and 3e. This is a collision detection means with a simple structure. FIG. 5 shows a cross-sectional view of the configuration of this example.

  The absorber 2 of the present embodiment is formed in the same manner as the absorber 2 of the first embodiment except that the thickness in the vertical direction (vertical direction) of the vehicle is different.

  Each of the two chamber members 3d and 3e is a substantially box-shaped member having chamber spaces 30d and 30e partitioned therein. Each of the chamber members 3d and 3e is formed in the same manner as the chamber member 3 of the first embodiment except that the thickness in the vertical direction (vertical direction) of the vehicle is different. The substantially box-shaped chamber member 3d is disposed in front of the bumper reinforcement 1 and above the absorber 2, and the chamber member 3e is disposed in front of the bumper reinforcement 1 and below the absorber 2. ing.

  Each of the two chamber members 3d, 3e is provided with pressure sensors 4d, 4e for measuring the pressure in the chamber spaces 30d, 30e.

  The present embodiment is the same collision detection unit as that of the first embodiment except that the arrangement positions of the absorber 2 and the chamber member 3 are different, and exhibits the same effect.

(Example 5)
In the present embodiment, the absorber 2 is made of foamed resin, the chamber member 3 is composed of two chamber members 3f and 3g that are spaced apart from each other in the vehicle vertical direction, and the absorber 2 is made of foamed resin. This is a collision detection unit having the same configuration as that of the first embodiment. FIG. 6 shows the configuration of this example.

  The absorber 2 is a member made of foamed resin fixed to the front surface 10 a of the protruding portion 10 of the bumper reinforcement 1. The absorber 2 forms two spaces 20 and 21 arranged in the vehicle vertical direction outside the absorber 2 and with the bumper reinforcement 1.

  Each of the two chamber members 3f and 3g is a substantially box-shaped member having chamber spaces 30f and 30g partitioned therein. The substantially box-shaped member is disposed in each of the two spaces 20 and 21 defined by the bumper reinforcement 1 and the absorber 2.

  Each of the two chamber members 3f, 3g is provided with pressure sensors 4f, 4g for measuring the pressure in the chamber spaces 30f, 30g.

  In the collision detection means of this embodiment, the chamber members 3f and 3g are respectively arranged outside the absorber 2, and the width of the chamber members 3f and 3g in the vehicle front-rear direction overlaps the width of the absorber 2 in the vehicle front-rear direction. ing. Further, the widths of the two chamber members 3f and 3g in the vehicle front-rear direction overlap each other in the vehicle vertical direction.

  The present embodiment is a collision detection unit similar to that of the first embodiment except that the shape of the chamber member is different, and exhibits the same effect. Furthermore, the collision detection means of the present embodiment exhibits an effect that the collision position can be obtained by comparing pressure fluctuations in the chamber spaces 30f and 30g of the two chamber members 3f and 3g.

  Any of the collision detection means of the above-described embodiments can be easily assembled and the impact applied to the collision object can be sufficiently reduced.

(Pedestrian collision detection means and pedestrian protection system)
The collision detection means of each of the above embodiments includes a pedestrian collision detection means that determines whether or not the colliding object is a pedestrian at the time of a collision, and a walking that protects the pedestrian when the collision object is determined to be a pedestrian. It can be used for a person protection system.

  The pedestrian collision detection unit includes a collision detection unit and a collision determination unit that receives an output signal of the pressure sensor 3 of the collision detection unit and determines a collision object based on the output signal. The pedestrian protection system includes a pedestrian collision detection means, a starter means that activates the protection means when the pedestrian collision determination means determines that the collision object is a pedestrian, and a vehicle incorporating the collision detection means. And pedestrian protection means for protecting the pedestrian in the event of a pedestrian collision. The configuration of this pedestrian protection system is shown in FIG.

  First, the pressure fluctuation detected by the pressure sensor 3 is transmitted to the collision determination means. When it is detected from the detection result of the pressure sensor 3 that the collision object has collided, the collision determination means determines whether or not the collision object is a pedestrian. The determination in the collision determination means can be performed as follows, for example. First, it is determined whether or not the colliding object has collided. When it is detected that the colliding object has collided, the collision load is calculated from the output signal of the pressure sensor 3.

  Then, the mass of the collision object is calculated based on the calculated collision load and the vehicle speed detected by a vehicle speed sensor (not shown). As a method of calculating the mass of the collision object from the collision load and the vehicle speed, a conventionally known method can be used, and a method of calculating the mass using the one-time integral value of the collision load and the vehicle speed can be used.

  And a calculating means determines the kind of collision object from the mass of a collision object. For example, when the mass of the collision object is within a predetermined range, it is determined as a pedestrian, and when it is larger than the predetermined range, it is determined as a building or another vehicle.

  When the collision object is determined to be a pedestrian, the activation unit issues an activation signal that activates the pedestrian protection unit. The pedestrian protection means that receives the activation signal operates to protect the pedestrian.

  The pedestrian protection means is a device that is mounted on the hood of the vehicle and protects the pedestrian when the pedestrian collides, such as a device that raises the hood or an airbag device that deploys in a hood shape. . By operating the pedestrian protection means, the injury value that a pedestrian colliding with the vehicle receives is reduced.

  The pedestrian protection system of the present embodiment is a pedestrian protection system that can be assembled easily and uses collision detection means that can sufficiently reduce the impact applied to the collision object, and exhibit these effects. Collision detection means with excellent collision detection accuracy is used, and the protection system is configured to suppress malfunction due to erroneous detection.

(Deformation)
In each of the above embodiments, the bumper reinforcement 1 is formed so that the cross section in the vehicle vertical direction is convex toward the front of the vehicle, but is not limited to this shape. It may be a conventionally known shape.

It is the figure which showed the structure of the collision detection means of Example 1. FIG. It is sectional drawing which showed the structure of the collision detection means of Example 1. It is sectional drawing which showed the structure of the collision detection means of Example 2. It is the front view which showed the structure of the collision detection means of Example 3. It is the figure which showed the structure of the collision detection means of Example 4. It is the figure which showed the structure of the collision detection means of Example 5. It is the figure which showed the structure of the pedestrian protection system which has the collision detection means of an Example.

Explanation of symbols

1: Bumper reinforcement 2: Absorber 3: Chamber member 30: Chamber space 4: Pressure sensor 5: Bumper cover

Claims (4)

A bumper reinforcement fixed to a side member of the vehicle,
An absorber disposed in front of the bumper reinforcement in the vehicle traveling direction;
A chamber member disposed in front of the bumper reinforcement in the vehicle traveling direction and defining a substantially sealed chamber space;
A pressure sensor for detecting the pressure in the chamber space;
In a collision detecting means for detecting a collision between the vehicle and another object from a change in pressure in the chamber space,
The chamber member is disposed outside the absorber;
The absorber and the chamber are arranged such that at least a part of the width of the absorber in the vehicle front-rear direction and at least a part of the width of the chamber member in the vehicle front-rear direction overlap each other in the vehicle vertical direction. The collision detection means characterized by the above.   The collision detection means according to claim 1, wherein the chamber member is disposed above the absorber. The collision detection means according to claim 1,
A collision determination unit that receives an output signal of the collision detection unit and determines whether the collision object is a pedestrian based on the output signal;
A pedestrian collision detection means characterized by comprising: Pedestrian collision detection means according to claim 3,
Protection means for protecting the pedestrian when the pedestrian collision detection means determines that the pedestrian has a collision;
A pedestrian protection system characterized by comprising:

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