JP2010179667A - Collision detection device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure chamber type collision detection device for a vehicle, capable of reliably detecting damage to a chamber member in a simple configuration. <P>SOLUTION: This collision detection device for a vehicle includes a chamber member 7 which is disposed on the front surface of a bumper reinforcement 4 in a vehicle bumper 2 and forms a chamber space 7a therein. In the chamber member, a pressure introduction part 72 extending, in a tubular shape, from a chamber body 71 introduces a pressure from an external space into the chamber space 7a through a pressure introduction port 72a. When the chamber member 7 is normal, the result of the detection of the pressure in the chamber space 7a by a pressure sensor 8 varies according to a vehicle speed. When the chamber member 7 is damaged and a hole communicating with the atmosphere is formed therein, the result of the detection of the pressure in the chamber space 7a by the pressure sensor 8 matches the atmospheric pressure and is kept constant irrespective of the vehicle speed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle collision detection device that detects a collision of a pedestrian or the like with a vehicle.

  Conventionally, regarding vehicle safety, it is required not only to ensure the safety of a vehicle occupant during an accident, but also to reduce damage to the pedestrian when the pedestrian collides with the vehicle. Therefore, when a collision of a pedestrian with a vehicle is detected and a pedestrian protection device such as an active hood or a cowl airbag is activated, an injury value (walking) that a pedestrian who collides with the vehicle and falls into the hood Have been proposed to reduce the impact received by a person.

  For example, in Japanese Patent Laid-Open No. 2006-117157 (Patent Document 1), a chamber member is disposed in front of a bumper reinforcement in a vehicle bumper in order to detect a collision, and a pressure change is detected by a pressure sensor. There has been proposed a vehicle collision detection device configured to detect a collision of a pedestrian or the like with a vehicle bumper by detection.

JP 2006-117157 A

  Here, as a pressure chamber type vehicle collision detection device, a configuration shown in FIG. 6 can be considered. In the vehicle collision detection device 101 of the reference example shown in FIG. 6, a chamber member 107 is disposed in the vehicle bumper 102 above the front surface of the bumper reinforcement 104 and above the absorber 106. When the chamber member of the vehicle collision detection apparatus as described above is damaged, such as a large hole or a tear, the space in the chamber member 107 cannot be said to be a substantially sealed space. There is a possibility that the pressure sensor 108 cannot accurately detect the pressure in the chamber member 107 when it collides with 102.

  Therefore, it is conceivable to attach a vibration applying device 200 that applies vibration to the chamber member 107, apply vibration to the chamber member 107, detect the pressure in the chamber space by the vibration, and detect whether the chamber member 107 is abnormal. It is done.

  However, in order to forcibly apply vibration to the chamber member 107 and detect the pressure in the chamber member 107, the vibration applying device 200 for applying vibration to the chamber member 107 is necessary, which increases costs. There's a problem. In addition, since there is a need for replacement or periodic inspection due to a failure of the vibration applying device 200, there may be a problem that maintenance work increases.

  The present invention has been made in view of the above-described problems, and provides a vehicle collision detection device capable of reliably detecting breakage of a chamber member with a simple configuration in a pressure chamber type vehicle collision detection device. For the purpose.

The invention according to claim 1, which has been made to solve the above-described problems, includes a chamber member having a chamber body disposed in front of a bumper reinforcement in a vehicle bumper and having a chamber space formed therein. A vehicle collision detection device comprising: a pressure sensor that detects a pressure in the chamber space; and configured to detect a collision with the vehicle bumper based on a pressure detection result by the pressure sensor.
The chamber member has a pressure introduction portion provided in a tubular shape from the chamber main body and provided with a pressure introduction port capable of introducing pressure from an external space into the chamber space.
A chamber state determination unit that determines whether or not the chamber member is damaged based on a vehicle speed detection result input from a vehicle speed sensor and a pressure detection result by the pressure sensor is provided.

  According to this configuration, in the chamber member having the chamber body that is disposed on the front surface of the bumper reinforcement in the vehicle bumper and has the chamber space formed therein, the pressure introducing portion that extends in a tubular shape from the chamber body is Then, pressure is introduced from the external space into the chamber space through the pressure inlet. Here, since the pressure introduced into the chamber space by the pressure introduction unit changes according to the vehicle speed, when the chamber member is normal, the pressure detection result of the chamber space by the pressure sensor changes according to the vehicle speed. . On the other hand, when the chamber member is damaged and a hole communicating with the atmosphere is opened, the pressure detection result of the chamber space by the pressure sensor coincides with the atmospheric pressure and becomes constant regardless of the vehicle speed. Therefore, the chamber state determination unit can determine whether or not the chamber member is damaged based on the vehicle speed detection result input from the vehicle speed sensor and the pressure detection result by the pressure sensor. That is, damage to the chamber member can be reliably detected with a simple configuration.

  According to a second aspect of the present invention, in the vehicle collision detection device according to the first aspect, the pressure introducing port of the pressure introducing portion is opened to the outside from the bottom surface of the vehicle body.

  According to this configuration, since the pressure introduction port of the pressure introduction part opens to the outside from the bottom surface of the vehicle body, the pressure in the space between the bottom surface of the vehicle body and the road surface is introduced into the chamber space via the pressure introduction port. Here, a negative pressure corresponding to the vehicle speed is generated on the bottom surface of the vehicle body due to the generation of traveling wind in the space between the vehicle body bottom surface and the road surface when the vehicle is traveling (Venturi effect). Therefore, since a negative pressure corresponding to the vehicle speed is introduced into the chamber space via the pressure introducing portion, when the chamber member is normal, the pressure detection result of the chamber space by the pressure sensor decreases according to the vehicle speed. On the other hand, when the chamber member is damaged and a hole communicating with the atmosphere is opened, the pressure detection result of the chamber space by the pressure sensor coincides with the atmospheric pressure and becomes constant regardless of the vehicle speed. Therefore, the chamber state determination unit can determine whether or not the chamber member is damaged based on the vehicle speed detection result input from the vehicle speed sensor and the pressure detection result by the pressure sensor.

  According to a third aspect of the present invention, in the vehicular collision detection device according to the first aspect, the pressure introduction port of the pressure introduction portion is within the flow path of traveling wind introduced from a ventilation port on the front surface of the vehicle. It is characterized by opening in a direction that intersects the direction of flow of the traveling wind.

  According to this configuration, the pressure introducing port of the pressure introducing portion opens in a direction intersecting with the traveling direction of the traveling wind in the traveling path of the traveling wind introduced from the ventilation port on the front surface of the vehicle. Here, a negative pressure corresponding to the wind speed of the traveling wind is generated in a direction crossing the flow direction of the traveling wind (Bernoulli's theorem). Further, the wind speed of the traveling wind is proportional to the magnitude of the vehicle speed. Therefore, since a negative pressure corresponding to the vehicle speed is introduced into the chamber space via the pressure introducing portion, when the chamber member is normal, the pressure detection result of the chamber space by the pressure sensor decreases according to the vehicle speed. . On the other hand, when the chamber member is damaged and a hole communicating with the atmosphere is opened, the pressure detection result of the chamber space by the pressure sensor coincides with the atmospheric pressure and becomes constant regardless of the vehicle speed. Therefore, the chamber state determination unit can determine whether or not the chamber member is damaged based on the vehicle speed detection result input from the vehicle speed sensor and the pressure detection result by the pressure sensor. In this configuration, since the pressure inlet can be provided in the vehicle bumper, it is less exposed to wind and rain, and does not come into contact with gravel or sand on the road surface while the vehicle is running. Can be prevented.

  According to a fourth aspect of the present invention, in the vehicle collision detection device according to any one of the first to third aspects, the chamber member is formed by integrally forming the chamber body and the pressure introducing portion. It is characterized by being.

  According to this configuration, since the chamber main body and the pressure introducing portion are integrally formed, the number of parts can be reduced, and the cost and the number of mounting steps can be reduced.

  According to a fifth aspect of the present invention, in the vehicle collision detection device according to the first aspect, at least a part of the pressure introducing portion is supported by a lower absorber that is provided in a lower portion of the vehicle bumper and absorbs an impact. It is characterized by that.

  According to this configuration, the pressure introducing portion is provided at the lower part in the vehicle bumper and is at least partially supported by the lower absorber that absorbs the impact, thereby preventing deformation and damage of the pressure introducing portion due to the vibration of the vehicle. be able to.

It is a whole lineblock diagram showing the collision detection device for vehicles of a first embodiment by plane view. It is principal part sectional drawing (AA sectional view of FIG. 1) seen from the side of the collision detection apparatus for vehicles of 1st embodiment. It is a flowchart which shows the state determination process of a chamber member in 1st embodiment. It is the graph which showed the relationship between the pressure in the chamber space of a chamber member, and the speed of a vehicle in 1st embodiment. It is principal part sectional drawing (AA sectional view of FIG. 1) seen from the side of the collision detection apparatus for vehicles of 2nd embodiment. It is a whole block diagram which shows the collision detection apparatus for vehicles of a reference example by planar view.

  Hereinafter, embodiments embodying the vehicle collision detection device of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram showing a vehicle collision detection apparatus 1 according to a first embodiment of the present invention in a plan view. FIG. 2 is a cross-sectional view of the main part of the vehicle collision detection device 1 as viewed from the side.

  As shown in FIG. 1, the vehicle collision detection apparatus 1 includes a bumper cover 3, a chamber member 7, a pressure sensor 8, a pedestrian protection device ECU 10, a vehicle speed sensor (see FIG. (Not shown).

  As shown in FIGS. 1 and 2, the vehicle bumper 2 is mainly composed of a bumper cover 3, a bumper reinforcement 4, a side member 5, an absorber 6, and a chamber member 7. In FIG. 2, the bumper cover 3, the bumper reinforcement 4, the absorber 6 and the chamber member 7 are shown in cross section.

  The bumper cover 3 extends in the vehicle width direction (left-right direction) at the front end of the vehicle, and is a resin (for example, polypropylene) attached to the vehicle body so as to cover the bumper reinforcement 4, the side member 5, the absorber 6, and the chamber member 7. A cover member. The vehicle body bottom side of the bumper cover 3 has a hole 3a for inserting a pressure introducing portion 72 of the chamber member 7 described later.

  The bumper reinforcement 4 is a metal structural member that is disposed in the bumper cover 3 and extends in the vehicle width direction, and as shown in FIG. It is a hollow member which has.

  The side members 5 are a pair of metal members that are positioned in the vicinity of the left and right side surfaces of the vehicle and extend in the vehicle front-rear direction, and the bumper reinforcement 4 described above is attached to the front end thereof.

  The absorber 6 is a foamed resin member that extends in the vehicle width direction and is attached to the front side of the bumper reinforcement front surface 4 a in the bumper cover 3, and exhibits an impact absorbing function in the vehicle bumper 2. The absorber 6 is integrally formed with a lower portion 601 and an upper portion 602. The lower portion 601 of the absorber 6 is a portion that is disposed in front of the lower portion of the bumper reinforcement 4 and below the chamber member 7 to exert an impact absorbing function, and the front end is located in the vicinity of the rear surface of the bumper cover 3 (the vehicle inner surface). The rear end is in contact with a region from the lower front surface to the lower surface of the bumper reinforcement 4. More specifically, the lower portion 601 is formed in a U-shaped cross section that opens to the rear side of the vehicle, and includes a plate-like portion 601a and a plate-like portion 601b that are vertically opposed to each other with a gap therebetween, and the plate-like portion 601a, Each rear end portion of 601b is in contact with a region from the lower front surface to the lower surface of the bumper reinforcement 4. And the lower part 601 of the absorber 6 has the recessed part 6a which makes the notch shape for inserting the pressure introduction part 72 of the chamber member 7 mentioned later. The recessed portion 6a is formed in the vicinity of the position where the pressure introducing portion 72 is disposed, and is recessed from the vehicle rear side to the vehicle front side. The upper portion 602 of the absorber 6 is erected from a position closer to the front of the upper surface of the lower portion 601 of the absorber 6 and is provided between the back surface of the bumper cover 3 and the front surface of the chamber member 7. Exhibits shock transmission.

  The lower absorber 61 is a foamed resin member that is disposed separately from the absorber 6 near the lower end portion in the vehicle bumper 2 and below the absorber 6 and extends in the vehicle width direction, and exhibits an impact absorbing function. . Further, the lower absorber 61 has a concave portion 61a (the same shape as the concave portion 6a) for inserting the pressure introducing portion 72 of the chamber member 7. By inserting the pressure introduction part 72 into the recess 61a of the lower absorber 61, at least a part (specifically, the lower part) of the pressure introduction part 72 is supported, so that the deformation of the pressure introduction part 72 due to the vibration of the vehicle. And can prevent damage.

  The chamber member 7 is a hollow member made of a synthetic resin such as substantially box-like polyethylene that is attached to the bumper reinforcement front surface 4a inside the bumper cover 3 and extends in the vehicle width direction. More specifically, the chamber member 7 includes a chamber body 71, a pressure introducing portion 72, and an extending portion 73.

  The chamber main body 71 occupies most of the chamber member 7, and forms a substantially sealed chamber space 7a that extends in the vehicle width direction and is surrounded by a wall of a thickness of several millimeters made of a soft resin. . A pressure introducing portion 72 extends downward from the lower wall portion 71 b on the lower surface side of the chamber body 71.

  The pressure introducing portion 72 is a tubular portion that is integrally formed with the chamber main body 71 by a soft resin and extends downward from a substantially central portion of the lower wall portion 71b of the chamber member 7, and from the external space to the inside of the chamber space 7a. A pressure introduction port 72a through which pressure can be introduced is provided. An internal space formed in the inner periphery of the pressure introducing portion 72 communicates with the chamber space 7a. The pressure introducing portion 72 of the chamber member 7 is connected to the plate-like portion 601 b of the lower portion 601 of the absorber 6, the recessed portion 6 a of the lower absorber 61, the recessed portion 61 a of the lower absorber 61, and the hole 3 a of the bumper cover 3. The opening tip is extended outside the bottom surface of the vehicle bumper 2. That is, since the pressure introduction port 72a of the pressure introduction part 72 is opened to the outside from the bottom surface of the vehicle body, the pressure in the space between the bottom surface of the vehicle body and the road surface is introduced into the chamber space 7a via the pressure introduction port 72a. It has become.

  The extending portion 73 is formed integrally with the chamber body 71 from a soft resin, extends from a substantially central portion in the vehicle width direction of the chamber body 71 to the bumper reinforcement upper surface 4b, and extends from the front side of the vehicle body to the rear side of the vehicle body. It is the part which was done. The internal space of the extending portion 73 communicates with the internal space of the chamber body 71 and forms a part of the chamber space 7a. And the pressure sensor 8 is arrange | positioned by the extending part 73. FIG.

  The pressure sensor 8 is a sensor device that can detect a gas pressure, and includes a main body of the pressure sensor 8 and a pressure introduction pipe 81, and a sensor element for pressure detection is provided in the main body of the pressure sensor 8. . The pressure introducing pipe 81 is inserted from above the extending portion 73 to detect pressure. The pressure sensor 8 outputs a voltage signal proportional to the pressure, and transmits a signal to the pedestrian protection device ECU 10 via the signal line 10a. The pressure sensor 8 is fixed via a bracket 9.

  The bracket 9 is formed in a bridge shape across the extended portion 73 and is fixed to the upper surface of the bumper reinforcement 4, and the pressure sensor 8 is attached and fixed above the bracket 9.

  The pedestrian protection device ECU10 is connected to the pressure sensor 8 and is disposed in the vehicle body. This is an electronic control device for controlling the activation of a pedestrian protection device (not shown) (for example, a known pedestrian protection airbag or hood flip-up device), and a signal output from the pressure sensor 8 is connected to the signal line 10a. It is comprised so that it may be input via. The pedestrian protection device ECU 10 executes a process for determining whether or not a pedestrian (that is, a human body) has collided with the vehicle bumper 2 based on the pressure detection result of the pressure sensor 8.

  The vehicle speed sensor (not shown) is a sensor that can detect the traveling speed of a vehicle that is provided as a standard in the vehicle, and transmits the detected signal to the pedestrian protection ECU 10.

  Next, detection of a collision by the vehicle collision detection apparatus 1 of the present embodiment will be described. When a pedestrian collides with the vehicle bumper 2 to which the collision detection device of the present embodiment is assembled, the pedestrian presses the vehicle bumper 2, and the absorber 6 absorbs the impact through the bumper cover 3, The chamber member 7 is pressed, and the pressed portion of the chamber member 7 is deformed and crushed. The chamber member 7 is pressed and deformed, and the gas pressure in the chamber space 7a increases. This increase in pressure is detected by the pressure sensor 8 via the pressure introduction pipe 81, and an output signal is sent to the pedestrian protection device ECU10 via the signal line 10a, and the pedestrian is sent to the vehicle bumper 2 based on the pressure detection result. A process of determining whether or not (that is, a human body) has collided is executed.

  Next, the flow of the state determination process of the chamber member 7 executed in the pedestrian protection apparatus ECU10 will be described with reference to FIGS. FIG. 3 is a flowchart showing the state determination process of the chamber member 7. FIG. 4 is a graph showing the relationship between the pressure (normal and abnormal) in the chamber space 7a of the chamber member 7 and the speed of the vehicle.

  First, the pedestrian protection apparatus ECU 10 initializes a vehicle speed signal V used as a calculation value, a pressure P1 detected by the pressure sensor 8, and an estimated pressure P2 with respect to the vehicle speed. (Step 100. Hereinafter, Step 100 is abbreviated as S100. The same applies to other steps.)

  Next, in S110, a vehicle speed signal V is read from a vehicle speed sensor provided in the vehicle. In S120, the detected pressure value P1 of the chamber space 7a of the chamber member 7 is read from the pressure sensor 8. Next, in S130, the estimated pressure P2 with respect to the vehicle speed is calculated.

  Here, the relationship between the vehicle speed and the pressure in the chamber space 7a will be described. When the vehicle travels, traveling wind is generated in the space between the bottom surface of the vehicle body and the road surface, so that the pressure in the space between the bottom surface of the vehicle body and the road surface decreases as the vehicle speed increases (in other words, negative pressure corresponding to the vehicle speed is generated). ) It is known that a phenomenon called the Venturi effect occurs. In the present embodiment, as described above, the pressure introduction port 72a of the pressure introduction part 72 opens to the outside from the bottom surface of the vehicle body, and the pressure in the space between the bottom surface of the vehicle body and the road surface enters the chamber space 7a via the pressure introduction port 72a. It has been introduced. For this reason, a negative pressure corresponding to the vehicle speed is introduced into the chamber space 7 a via the pressure introducing portion 72. Therefore, the pressure in the chamber space 7a is theoretically calculated as the estimated pressure P2 that gradually decreases as the vehicle speed V increases (see FIG. 4).

  When the chamber member 7 is normal (that is, there is no tear or the like), the detected pressure value P1 gradually decreases as the vehicle speed increases (P1 indicated by a solid line in FIG. 4), similarly to the estimated pressure P2. On the other hand, when the chamber member 7 is broken and a hole communicating with the atmosphere is opened, the pressure in the chamber space 7a of the chamber member 7 is constant regardless of the vehicle speed (in FIG. P1) shown. Therefore, by comparing the estimated pressure P2 based on the vehicle speed and the detected pressure value P1, it is possible to determine whether or not the chamber member 7 has a damage that hinders pressure detection.

  Next, in S140, the result of multiplying the constant A by the estimated pressure P2 is compared with the pressure detection value P1 output from the pressure sensor 8. Here, the constant A is a parameter for adjusting to cope with a change in pressure depending on an air resistance, temperature, or the like received by the vehicle body structure. When the pressure detection value P1 is equal to or smaller than the multiplication result of S140 (A × P2 ≧ P1, S140: Yes), it is determined in S150 that the chamber member 7 is not torn (that is, normal).

  On the other hand, when the pressure detection value P1 is larger than the multiplication result of S140 (A × P2 <P1, S140: No), it is determined in S160 that the chamber member 7 is torn (that is, abnormal) and is provided in the vehicle interior. Outputs a signal to turn on the diagnostic lamp. In this case, since the pedestrian protection device cannot be normally operated in the case of a pedestrian collision, the chamber member 7 needs to be repaired and replaced. In other words, the pedestrian protection device ECU 10 lights a diagnostic lamp as a warning lamp to inform the driver that the chamber member 7 is damaged or the like, and prompts a repair and replacement of the chamber member 7. Note that step S140 functions as a chamber state determination unit of the present invention.

  As is clear from the above detailed description, according to the present embodiment, the chamber having the chamber main body 71 formed in the vehicle bumper 2 on the front surface of the bumper reinforcement 4 and having the chamber space 7a formed therein. In the member 7, a pressure introducing portion 72 extending in a tubular shape from the chamber main body 71 introduces pressure from the external space into the chamber space 7a via the pressure introducing port 72a. Since the pressure introduction port 72a of the pressure introduction part 72 opens to the outside from the bottom surface of the vehicle body, the pressure in the space between the bottom surface of the vehicle body and the road surface is introduced into the chamber space 7a via the pressure introduction port 72. Accordingly, a negative pressure corresponding to the vehicle speed is introduced into the chamber space 7a via the pressure introducing portion 72. Therefore, when the chamber member 7 is normal, the pressure detection result of the chamber space 7a by the pressure sensor 8 is the vehicle speed. Decreases accordingly. On the other hand, when the chamber member 7 is damaged and a hole communicating with the atmosphere is opened, the pressure detection result of the chamber space 7a by the pressure sensor 8 matches the atmospheric pressure and is constant regardless of the vehicle speed. Therefore, the pedestrian protection apparatus ECU10 (S140) as the chamber state determination unit determines whether or not the chamber member 7 is damaged based on the vehicle speed detection result input from the vehicle speed sensor and the pressure detection result by the pressure sensor 8. Can be determined. That is, it is possible to reliably detect the breakage of the chamber member 7 with a simple configuration.

  Furthermore, since the chamber main body 71 and the pressure introduction part 72 are integrally formed, the chamber member 7 can reduce the number of parts, and can reduce cost and attachment man-hours.

  Further, since the pressure introducing portion 72 is provided at the lower portion in the vehicle bumper 2 and is supported at least in part (lower portion) by the lower absorber 61 that absorbs the impact, the deformation or damage of the pressure introducing portion 72 due to the vibration of the vehicle. Can be prevented.

  Next, a second embodiment will be described with reference to FIG. FIG. 5 is a cross-sectional view of the main part viewed from the side of the vehicle collision detection device of the second embodiment (cross section taken along line AA in FIG. 1). In addition, the same code | symbol is attached | subjected to the structure same as embodiment mentioned above, and detailed description about them is abbreviate | omitted (the same also in the following embodiment and modification).

  In the present embodiment, as shown in FIG. 5, the bumper cover 3 has a ventilation opening 20 through which traveling wind outside the vehicle passes under the bumper cover 3. The pressure introducing portion 72 is a tubular portion that extends downward from the substantially central portion of the lower wall portion 71 b of the chamber member 7 and is inserted into the concave portion 6 a of the lower portion 601 of the absorber 6, and the pressure introducing port 72 a is the lower portion of the absorber 6. It protrudes from the 601 side. The pressure introduction port 72a opens in a direction intersecting (in the present embodiment, orthogonal) with the flow direction of the traveling wind in the traveling path of the traveling wind introduced from the ventilation port 20 on the front surface of the vehicle. That is, in the above-described embodiment, the pressure introduction port 72a of the pressure introduction portion 72 is configured to open to the outside from the bottom surface of the vehicle body. However, in this embodiment, the pressure introduction port 72a is provided in the vehicle bumper 2. .

  Here, the pressure introduction port 72a of the pressure introduction unit 72 is open in a direction perpendicular to the flow direction of the traveling wind in the traveling path of the traveling wind introduced from the ventilation port 20 on the front surface of the vehicle. In the direction orthogonal to the flow direction, a negative pressure corresponding to the wind speed of the traveling wind is generated (Bernoulli's theorem), and the wind speed of the traveling wind is proportional to the magnitude of the vehicle speed. Therefore, a negative pressure corresponding to the vehicle speed is introduced into the chamber space 7a via the pressure introducing portion 72.

  As is apparent from the above description, the same effects as those of the first embodiment can be obtained in this embodiment. In this configuration, since the pressure inlet 72a can be provided in the vehicle bumper 2, it is less exposed to wind and rain, and does not come into contact with gravel, sand, etc. on the road surface while the vehicle is running. And can prevent damage.

  The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention. For example, in the first embodiment described above, the notch-shaped concave portion 6a is provided in the lower portion 601 of the absorber 6 to support the pressure introducing portion 72. However, the concave portion 6a may be formed in a groove shape, and the concave portion 6a It is good also as a structure which replaces and provides a hole-shaped support part. Further, the chamber main body 71 and the pressure introducing portion 72 are integrally formed. However, the pressure introducing portion 72 is formed separately from another material and integrated with the chamber main body 71 by insert molding or the like. It is good.

1: Vehicle collision detection device 2: Vehicle bumper 3: Bumper cover 3a: Hole 4: Bumper reinforcement 4a: Bumper reinforcement front 5: Side member 6: Absorber 601: Lower 602: Upper 601a, 601b: Plate shape Part 61: Lower absorber 6a, 61a: Recess 7: Chamber member 71: Chamber body 71b: Lower wall part 72: Pressure introduction part 72a: Pressure introduction port 73: Extension part 7a: Chamber space 8: Pressure sensor 81: Pressure introduction Tube 10: Pedestrian protection device ECU 10a: Signal line 20: Vent 101: Vehicle collision detection device 103 for reference example 103: Bumper cover 104: Bumper reinforcement 106: Absorber 107: Chamber member 107a: Chamber space

Claims (5)

A chamber member disposed in front of a bumper reinforcement in a vehicle bumper and having a chamber body formed therein; and a pressure sensor for detecting a pressure in the chamber space; In the vehicle collision detection device configured to detect a collision with the vehicle bumper based on a pressure detection result,
The chamber member has a pressure introduction portion provided in a tubular shape from the chamber main body and provided with a pressure introduction port capable of introducing pressure from an external space into the chamber space.
A vehicle collision detection system comprising a chamber state determination unit that determines whether or not the chamber member is damaged based on a vehicle speed detection result input from a vehicle speed sensor and a pressure detection result of the pressure sensor. apparatus.   The vehicle collision detection device according to claim 1, wherein the pressure introduction port of the pressure introduction portion opens to the outside from the bottom surface of the vehicle body.   2. The pressure introducing port of the pressure introducing portion is opened in a direction intersecting with a flow direction of the traveling wind in a traveling path of traveling wind introduced from a ventilation port on the front surface of the vehicle. The vehicle collision detection device according to claim 1.   The vehicular collision detection device according to any one of claims 1 to 3, wherein the chamber member is formed integrally with the chamber main body and the pressure introducing portion.   2. The vehicle collision detection device according to claim 1, wherein at least a part of the pressure introducing unit is supported by a lower absorber that is provided in a lower portion of the vehicle bumper and absorbs an impact.

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