JP2007290689A - Collision detecting means - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a collision detecting means capable of detecting the collision of a pedestrian against the bumper of a vehicle. <P>SOLUTION: This collision detecting means is provided with a backboard 1, a chamber member 2 demarcating a sealed chamber space 20, and a pressure sensor 3 detecting the pressure of the chamber space 20, and it detects the collision based on a change in the pressure in the chamber space 20. The deformation amount of the chamber member 2 caused by a collision is almost constant regardless of the place of the chamber member 2 when collision conditions are the same. It is deformed by the same deformation volume regardless of the collided place at the time of the collision of an object, and thus, the collision detecting means superior in detection accuracy is achieved. <P>COPYRIGHT: (C)2008,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 means for protecting a pedestrian that has collided with a vehicle, a method of reducing the injury value (impact received by the pedestrian) received by a pedestrian who collided with the vehicle and fell into the hood has been considered. By reducing the impact of pedestrians, pedestrians are prevented from receiving fatal damage. In such a protective device, it is important to detect a collision with a vehicle such as a pedestrian.

  For example, Patent Document 1 discloses a means for detecting a collision with a vehicle.

  In Patent Document 1, a front sensor of a vehicle in which the front sensor is formed as a contact sensor, the front sensor has at least one cavity, and the cavity is in the cavity. A vehicle front sensor is disclosed in which each sensor element is provided and the front sensor detects a collision depending on the deformation of the cavity by the sensor element. Yes.

  However, Patent Document 1 discloses that another sensor that can detect a pedestrian collision is assembled. That is, the vehicle front sensor disclosed in Patent Document 1 is not suitable for detecting a pedestrian collision.

  The application of the detection method described in Patent Document 1 to the bumper of a vehicle for the purpose of detecting the collision of a pedestrian with the bumper of the vehicle has been considered. As a result, a collision detection unit having the configuration shown in FIGS. It was. As shown in FIGS. 28 to 29, this structure has a sealed space 20 (airtight space) between a bumper reinforcement 1 fixed to a side member Fm and a bumper cover 5 forming an outer peripheral surface of a bumper of a vehicle. The chamber member 2 that divides the space corresponding to the cavity of Patent Document 1 is disposed, and the pressure sensor 3 is used to detect a pedestrian collision from pressure fluctuations in the space 20.

  In such a structure, the front surface of the chamber member 2 in the vehicle is formed in a curved shape along the shape of the bumper cover 5. That is, the thickness of the chamber member 2 in the vehicle front-rear direction changes in the vehicle width direction. When a collision object collides with the chamber member having such a structure, even if the collision condition of the collision object is the same, it is considered that the method of applying the stress applied to the chamber member 2 differs depending on the collision location. Specifically, the bumper is easily crushed at the center in the width direction of the vehicle, and the vicinity of both ends is not easily crushed. For this reason, even if a collision occurs under the same conditions, a large force is applied to both ends in a short time, and a force smaller than both ends is applied to the center over a long time. That is, the rate of pressure change varies depending on the collision site.

Although such a collision detection means can detect a collision, it has been difficult to determine a collision object (determination as to whether it is a human body).
JP 2005-538881 A

  This invention is made | formed in view of the said actual condition, and makes it a subject to provide the collision detection means which can detect the collision of the pedestrian to the bumper of a vehicle.

  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 first collision detection means of the present invention detects a pressure of the chamber space, a back plate fixed to the side member of the vehicle, a chamber member disposed in front of the back plate and defining a sealed chamber space. A collision detection means for detecting a collision between a vehicle and a collision object from fluctuations in pressure in the chamber space, and the chamber member has the same collision condition other than the collision position The deformation volume of the chamber member caused by the collision is substantially constant regardless of the location of the chamber member.

  The second collision detection means of the present invention is arranged in front of the back plate fixed to the side member of the vehicle, a fixing member that penetrates at least the back plate and fixes the side member and the back plate, and the back plate. A collision detection means for detecting a collision between a vehicle and a collision object from a variation in pressure in the chamber space, the chamber member defining a sealed chamber space, and a pressure sensor for detecting the pressure in the chamber space The chamber member has a shape that avoids the front of the fixing member, and is formed to have a shape in which unit shapes are continuously repeated in the width direction of the vehicle.

  The third collision detection means of the present invention is arranged in front of the back plate fixed to the side member of the vehicle, a fixing member that penetrates at least the back plate and fixes the side member and the back plate, and the back plate. A collision detection means for detecting a collision from a variation in pressure in the chamber space, the chamber member defining a sealed chamber space, and a pressure sensor for detecting the pressure in the chamber space, The fixing member has a slit extending in at least one direction in front of the fixing member.

  When the collision object collides, the first collision detection means of the present invention has the same deformation volume amount regardless of the collision location if the collision condition (how the collision object collides) is the same. The chamber member is deformed. As a result, the deformation volume of the chamber member due to the collision location of the collision object is suppressed, and the collision detection accuracy is improved.

  Further, the collision condition can be obtained from the deformation of the chamber member by performing the deformation of the same deformation volume for the collision of the same condition. As one of the collision conditions, the collision object can be determined.

  The second and third collision detection means of the present invention can fix the side member and the back plate in a state where the chamber member is disposed, and can suppress the volume change of the chamber member in the vehicle width direction. As a result, similar to the first collision detection means of the present invention, the change in the volume of deformation of the chamber member due to the collision location is suppressed, the collision detection accuracy is improved, and the collision detection means is excellent in assembly.

(First invention)
The collision detection means of the present invention includes a back plate fixed to a side member of a vehicle, a chamber member that is disposed in front of the back plate and defines a sealed chamber space, and a pressure sensor that detects a pressure in the chamber space. , And detects a collision from fluctuations in pressure in the chamber space. That is, the collision detection means of the present invention is attached to a bumper formed by a side member of the vehicle, and detects a collision of a pedestrian or the like with the bumper of the vehicle.

  When the collision condition of the chamber member of the collision detection means of the present invention is the same, the amount of deformation of the chamber member caused by the collision is substantially constant regardless of the location of the chamber member. Here, the deformation amount of the deformation chamber member is a volume change amount deformation volume amount deformation volume amount of the chamber member at the time of collision. The collision condition is a condition when the vehicle with the collision detection means assembled collides with the collision object. For example, the type of the collision object and the speed of the vehicle at the time of the collision can be increased. The chamber member of the collision detection means of the present invention is substantially the same regardless of the collision location if the collision condition (the collision object and the speed at the time of collision) is the same when the collision object collides with the collision detection means. The chamber member is deformed. That is, the amount of deformation of the chamber member at the time of collision does not vary depending on the location of the chamber member, and the collision detection accuracy is improved. Further, since the deformation volume (volume change amount) of the chamber member generated when the collision conditions are the same, the collision condition (the vehicle speed at the time of the collision and the type of the collision object is determined from the deformation volume of the chamber member. ). As a result, the collision detection means of the present invention can determine the type of collision object (whether it is a human body).

  More specifically, the outer surface of the vehicle on which the collision detection means is installed is curved. That is, the distance from the back plate to the outer surface of the vehicle varies depending on the width direction of the vehicle. When a collision object collides with a portion (central portion) where the distance between the back plate and the outer surface is long, a large pressure change occurs because this portion has a large stroke amount of deformation of the chamber member. On the other hand, even if a collision object collides with a short distance (end) between the back plate and the outer surface under the same collision condition, the amount of deformation of the chamber member (the amount by which the chamber member is compressed) is central. Since the pressure is small compared to the portion, the pressure change is small compared to the central portion. The pressure change in the chamber space depends on the volume change amount of the chamber member due to the deformation stroke of the chamber member and the chamber cross-sectional area. That is, if the deformation volume of the chamber member (the volume deformed by the collision) is different, the pressure change amount in the chamber space also changes. FIG. 26 shows the pressure change when the collision object collides with the center part and the end part under the same conditions. However, the collision detection means of the present invention has the same pressure change as shown in FIG. 27 because the deformation volume of the chamber member caused by the collision is constant regardless of the location of the chamber member. .

  The back plate is a member fixed to the side member of the vehicle, whereby the collision detection means of the present invention is assembled to the bumper of the vehicle and can detect a collision with the bumper of the vehicle. The back plate may be configured to be fixed to a bumper reinforcement or a crash box fixed to the side member, but is more preferably fixed directly to the side member of the vehicle. More preferably, the back plate is made of bumper reinforcement. Since the back plate is bumper reinforcement, it is not necessary to newly add a member to be the back plate, and an increase in cost can be suppressed.

  The chamber member is a member that defines a sealed chamber space. The chamber member is disposed in front of the back plate (not the front of the vehicle but the surface direction in which the collision object collides). By disposing the chamber member in front of the back plate, the chamber member is assembled to the bumper of the vehicle, and a collision with the bumper of the vehicle can be detected.

  According to the collision detection means of the present invention, when the collision object collides with the vehicle, the collision object presses the chamber member and fluctuates (increases) the pressure in the chamber space. And the pressure fluctuation of the chamber space at the time of this collision is measured with a pressure sensor, and a collision is detected from the measurement result of the pressure sensor.

  The collision detection means of this invention is assembled | attached to the bumper of a vehicle. Usually, the bumper of a vehicle forms the outer peripheral surface of the vehicle. That is, the collision detection means of the present invention preferably has a bumper cover that forms the outer peripheral surface of the vehicle.

  When the collision detection means of the present invention has a bumper cover, the bumper cover only needs to be positioned in front of the chamber member (not the front of the vehicle but the surface direction in which the collision object collides). That is, the front surface of the chamber member and the bumper cover may be arranged with a gap therebetween or may be arranged in a state where they are in contact with each other. Here, when the chamber member and the bumper cover are spaced apart from each other, the deformation of the bumper cover in a state in which the colliding object does not collide can be restricted. Therefore, it is preferable to dispose the filling member between the two.

  In the collision detection means of the present invention, it is preferable that the chamber member is arranged along the axial direction of the vehicle, and a pressing member formed to be harder than the chamber member is arranged in front of the chamber member. In this configuration, the pressing member is the above filling member. Because the pressing member is made of a material harder than the chamber member, when the collision object collides, the pressing member absorbs the impact of the collision at least before pressing the chamber member (stress for deforming the chamber member). Is suppressed. That is, the collision object deforms the chamber member via the pressing member, and increases the pressure in the chamber space. Examples of the material constituting the pressing member include a resin structure and a foamed resin molded body.

  In the collision detection means of the present invention, the chamber member is preferably disposed on the surface of the back plate, and the surface facing the back plate is formed along the outer peripheral surface of the vehicle. With such a configuration, the chamber member has a surface (a surface along the bumper cover) that substantially coincides with the bumper cover, and deformation of the bumper cover in a state where the collision object does not collide can be restricted.

  When the surface facing the back plate of the chamber member is formed along the outer peripheral surface of the vehicle, the facing surface of the chamber member and the back plate may be spaced apart or both may be in contact with each other. Good. Since the deformation of the bumper cover in a state where the collision object does not collide can be restricted when the chamber member and the back plate are arranged at an interval, it is preferable that a filling member is arranged between the two.

  In the collision detection means of the present invention, a pressing member formed to be harder than the chamber member is disposed on the surface of the back plate, and the chamber member is in a state where the axial direction is curved along the outer peripheral surface of the vehicle. It is preferable that the cross-sectional shape in the cross section perpendicular | vertical to an axial direction arrange | positioned on the surface has a substantially column shape.

  In the collision detection means of the present invention, the shape of the chamber member is not particularly limited as long as the chamber member has a shape that can make the deformation due to the collision of the collision object constant. For example, the shape may be a shape in which the shape in the cross section perpendicular to the axial direction is constant or a shape in which the cross sectional shape changes. Further, when the chamber member has a substantially columnar shape, the axial direction may be either linear or curved and extended.

  When the chamber member has a shape whose cross-sectional shape changes in a cross section perpendicular to the axial direction, the change may be either a smooth change or a rectangular change shape. Examples of the shape that changes in a rectangular shape in the axial direction include a shape having a cavity partially communicating with the outside. The cavity may be provided through the chamber member or may be provided so as not to penetrate the chamber member opened on one surface. Here, the cavity is a space defined by an outer wall that partitions the chamber member, and is different from the chamber space. By having a cavity, it will have the wall part which divides a cavity. The wall portion defining the cavity increases the strength in the spreading direction. That is, this wall portion exerts the effect of the rib to partially restrict the deformation of the chamber member, and the ease of deformation of the entire chamber member becomes uniform. The inside of the cavity may be filled with a filler such as foamed resin.

  The chamber member is preferably formed such that the thickness of the partition wall that partitions the chamber space is partially thick. Since the partition wall that divides the chamber space is partially thick, this thick portion functions as a reinforcing rib of the chamber member. In the chamber member, the strength in the vicinity of the portion where the partition wall is partially thickened is increased, and the collapse characteristics at the time of collision are partially increased. And it is preferable that the reinforcing rib in which the partition wall is formed to be partially thick is provided in the chamber member in a state of extending in the direction in which the collision object collides. In addition, the reinforcing rib is provided so that the chamber member can obtain desired characteristics, and the width, length, protruding height, etc. of the reinforcing rib are not particularly limited.

(Second invention)
The second collision detection means of the present invention is arranged in front of the back plate fixed to the side member of the vehicle, a fixing member that penetrates at least the back plate and fixes the side member and the back plate, and the back plate. And a chamber member that partitions the sealed chamber space, and a pressure sensor that detects the pressure in the chamber space, and detects a collision from a variation in pressure in the chamber space. That is, the collision detection means of the present invention is attached to a bumper formed by a side member of the vehicle, and detects a collision of a pedestrian or the like with the bumper of the vehicle.

  The chamber member of the collision detection means of the present invention is formed so that the chamber member has a shape that avoids the front of the fixed member, and the unit shape is continuous in the vehicle width direction. In the collision detection means of the present invention, the chamber member is formed in a shape that avoids the front of the fixed member. That is, there is no chamber member in front of the fixing member (a state in which the fixing member is exposed or a space is formed in front of the fixing member). By making such a configuration, the fixing member can be penetrated in a state where the chamber member is arranged. That is, the collision detection means of the present invention has improved assemblability.

  And the collision detection means of this invention is formed so that the unit shape may make the shape repeated continuously in the width direction of a vehicle. By forming a shape in which the unit shape is repeated in the width direction of the vehicle, the crushing characteristics of each unit shape are the same, so that the chamber member has the same (uniform) crushing characteristics (crushing) in the width direction of the vehicle. Load). Since the wall portion of the chamber member that divides the space in front of the fixing member extends in the front-rear direction of the vehicle, the collapse characteristics of the chamber member are deteriorated. However, the whole chamber member has a shape in which a unit shape having a space in front of the fixed member is repeated, so that it has a similar (uniform) crushing load at any location in the width direction of the vehicle. Become. As a result, when the collision object collides with the collision detection means, if the collision conditions are the same, the deformation amount of the chamber member caused by the collision is suppressed from changing depending on the collision location of the collision object, and the collision Detection accuracy is improved.

  The chamber member preferably has a meandering shape on the surface of the back plate. Here, the meandering shape is a shape having a smooth wave shape that swings in the vertical direction of the vehicle (extends in the width direction of the vehicle). When the chamber member has a meandering shape (wave shape), the unit shape corresponds to one or more cycles of the wave. Since the chamber member has such a shape, there is no wall portion that divides the chamber space and the wall portion that extends in the direction in which the colliding object collides intersects at an acute angle, thereby improving the collision detection accuracy. When such wall portions intersect with each other at an acute angle, the intersecting wall portions support the plane, and the collapse characteristics of the chamber member near the intersecting portion are deteriorated.

  When the collision conditions of the chamber member are the same, it is preferable that the deformation amount of the chamber member caused by the collision is substantially constant regardless of the location of the chamber member. Here, the deformation amount of the deformation chamber member corresponds to the deformation (compression) amount when the chamber member is deformed (compressed) in the front-rear direction of the vehicle at the time of collision. The collision condition is a condition when the vehicle with the collision detection means assembled collides with the collision object. For example, the type of the collision object and the speed of the vehicle at the time of the collision can be increased. The chamber member of the collision detection means of the present invention is substantially the same regardless of the collision location if the collision condition (the collision object and the speed at the time of collision) is the same when the collision object collides with the collision detection means. The chamber member is deformed. That is, the amount of deformation of the chamber member at the time of collision does not vary depending on the location of the chamber member, and the collision detection accuracy is improved. Further, since the deformation volume of the chamber member generated when the collision conditions are the same, the collision condition (the vehicle speed at the time of collision and the type of the collision object) can be obtained from the deformation volume of the chamber member. it can. As a result, the collision detection means of the present invention can determine the type of collision object (whether it is a human body).

  In the collision detection means of the present invention, the fixing member is not particularly limited as long as it is a member that penetrates the back plate and fixes the back plate and the side member, and examples thereof include bolts, rivets, and lashing hooks. be able to. That is, the fixing member is preferably at least one of a bolt, a rivet, and a securing hook.

  The back plate is a member fixed to the side member of the vehicle, whereby the collision detection means of the present invention is assembled to the bumper of the vehicle and can detect a collision with the bumper of the vehicle. The back plate may be configured to be fixed to a bumper reinforcement or a crash box fixed to the side member, but is more preferably fixed directly to the side member of the vehicle. More preferably, the back plate is made of bumper reinforcement. Since the back plate is bumper reinforcement, it is not necessary to newly add a member to be the back plate, and an increase in cost can be suppressed.

(Third invention)
The third collision detection means of the present invention is arranged in front of the back plate fixed to the side member of the vehicle, a fixing member that penetrates at least the back plate and fixes the side member and the back plate, and the back plate. And a chamber member that partitions the sealed chamber space, and a pressure sensor that detects the pressure in the chamber space, and detects a collision from a variation in pressure in the chamber space. That is, the collision detection means of the present invention is attached to a bumper formed by a side member of the vehicle, and detects a collision of a pedestrian or the like with the bumper of the vehicle.

  The chamber member of the collision detection means of the present invention has a slit extending in at least one direction in front of the fixed member. Here, the front of the fixing member is the front of the fixing member in the vehicle front-rear direction when the fixing member fixes the back plate. The slit of the chamber member penetrates the chamber member at least in the longitudinal direction of the vehicle. The collision detecting means of the present invention is means for detecting a collision from a change in pressure in the chamber space due to deformation of the chamber member, and the chamber member is relatively easily deformed. And since a chamber member has a slit ahead of a fixing member, a fixing member can be assembled | attached through this slit. That is, assembly can be performed by allowing the fixing member to pass through the slit in a state where the chamber member is disposed, and the assembly of the collision detection means is improved.

  By extending the slit in one direction, the chamber space is connected at least on the end portion side where the slit does not extend. As a result, the chamber member is not divided into a plurality of parts, and the force applied to the chamber member can change the pressure of the chamber space partitioned by the entire chamber member. In addition, since the slit extends in one direction, the cost of assembling the chamber member can be reduced. When the chamber member is composed of a plurality of parts, it is necessary to assemble each of them, and the assembling cost increases.

  In the collision detection means of the present invention, since the wall portion of the chamber member that divides the slit is the wall portion that divides the chamber member, when the pressure in the chamber space of the chamber member increases due to the collision, the slit is closed. A force due to an increase in pressure in the chamber space acts on the slit. That is, a force in the direction of closing the slit acts on each of the wall portions of the chamber member defining the slit to close the slit. The closed wall portions are pressed against each other, and the wall portions are not displaced. That is, the collision detection means of the present invention does not cause a change (displacement) in the pressure change in the chamber space due to the slit. For this reason, the collision detection means of the present invention can detect a collision with high detection accuracy.

  The slits formed in the chamber member are preferably in contact with the opposed inner surfaces. Here, the opposed inner surface refers to the surface of the pair of wall portions that divides the slit, the surface facing the other wall portion. Since the opposed inner surfaces of the slits are in contact with each other, it is possible to suppress the occurrence of pressure fluctuation loss in the chamber space in the slits. Specifically, when there is a gap between the slits, when the chamber member is deformed and the pressure in the chamber space rises, pressure is applied to the wall portions constituting the slit in a direction in which they are close to each other. And the wall part which partitions a slit by this pressure deform | transforms. That is, the detection of the pressure increase is delayed by the amount used for the deformation of the wall portion defining the slit between the deformation of the chamber space and the pressure increase. As a result, collision detection accuracy decreases. When the inner surfaces of the slits are in contact with each other, the deformation of the wall portions is regulated by the mutual wall portions, so that the pressure variation in the chamber space has a primary relationship with the deformation volume of the deformation of the chamber members. . As a result, no detection delay occurs.

  It is preferable that the chamber member is made of a material that can be deformed at the time of collision, and a portion that defines the slit of the chamber member is formed to be softer than other portions. Since the portion defining the slit is softer than the other portions, the wall portion defining the slit does not restrict the deformation of the chamber member, and the collision can be detected with high detection accuracy. Specifically, the wall part which divides a slit has spread in the front-back direction of the vehicle. And if this wall part has intensity | strength comparable as the other part of a chamber member, this wall part will control a deformation | transformation of the chamber member at the time of a collision. On the other hand, since the wall part which divides a slit was formed with the soft material, this regulation is stopped. As a result, the price of collision detection accuracy is suppressed, and collision detection can be performed with high detection accuracy.

  In the collision detection means of the present invention, the fixing member is not particularly limited as long as it is a member that penetrates the back plate and fixes the back plate and the side member, and examples thereof include bolts, rivets, and lashing hooks. be able to. That is, the fixing member is preferably at least one of a bolt, a rivet, and a securing hook.

  The back plate is a member fixed to the side member of the vehicle, whereby the collision detection means of the present invention is assembled to the bumper of the vehicle and can detect a collision with the bumper of the vehicle. The back plate may be configured to be fixed to a bumper reinforcement or a crash box fixed to the side member, but is more preferably fixed directly to the side member of the vehicle. More preferably, the back plate is made of bumper reinforcement. Since the back plate is bumper reinforcement, it is not necessary to newly add a member to be the back plate, and an increase in cost can be suppressed.

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

  Each of the collision detection means of the present invention preferably has a calculation means for obtaining a pressure variation in the chamber space from a detection signal from the pressure sensor and determining a 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.

  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 includes a bumper reinforcement 1, a chamber member 2, a pressure sensor 3, an absorber 4, and a calculation means (not shown). The structure of the collision detection means of the present embodiment is shown in FIGS. 1 is a top view of the collision detection means of the present embodiment, and FIG. 2 is a view showing a cross section taken along the line II of FIG.

  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 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 chamber member 2 is a substantially columnar member having a square cross section with a chamber space 20 defined therein. The columnar axial direction was fixed and arranged on the surface of the bumper reinforcement 1 with the bumpy reinforcement 1 extending along the extending direction. That is, the chamber member 2 is a hollow member that has a rectangular cross section in the front-rear direction of the vehicle and extends in the width direction of the vehicle.

  The pressure sensor 3 is a sensor for measuring the pressure of the chamber space 20 of the chamber member 2 and is assembled to the chamber member 2.

  The absorber 4 is a member made of foamed resin disposed on the surface of the chamber member 2 on the vehicle front side. The absorber 4 is formed in a shape in which the surface opposite to the chamber member 2 coincides with the inner peripheral surface of the bumper cover of the vehicle bumper.

  The calculation means is connected to the pressure sensor 4 and calculates the pressure of the chamber space 20 from the detection signal of the pressure sensor 3 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.

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

  As shown in FIG. 3, the bumper cover 5 covers the absorber 4 and forms the outer surface of the bumper of the vehicle.

  When a collision object collides with the bumper of the vehicle, the collision object presses the bumper of the vehicle. The collision object presses the absorber 4 via the bumper cover 5 of the bumper of the vehicle. The absorber 4 is formed to be harder than the chamber member 2, and the chamber member 2 is deformed before the absorber 4 is deformed (stress is absorbed).

  Due to the deformation of the chamber member 2, the pressure inside the chamber space 20 rises, the pressure sensor 3 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.

  In the collision detection means of this embodiment, the collision is determined based on the pressure fluctuation in the chamber space 20 of the chamber member 2. The chamber member 2 is given stress (stress that the collision object presses) that compresses the chamber member 2 through the absorber 4 that is harder than the chamber member 2. That is, the force from the collision object acts on the entire contact surface between the chamber member 2 and the absorber 4. Further, even if stress is partially concentrated on the contact surface between the absorber 4 and the chamber member 2, since the cross-sectional area of the chamber member 2 is constant, the amount of deformation becomes constant and changes depending on the collision location. It is the composition which does not occur. That is, the absorber 4 can press the chamber member 2 even if the collision position of the collision object with the vehicle bumper changes. That is, the collision detection unit has a detection result whose detection result does not change depending on the collision position of the collision object, and the collision detection unit has excellent detection accuracy.

  The absorber 4 is filled between the chamber member 2 and the bumper cover 5, and the absorber 4 regulates the deformation of the bumper cover 5 in a state where the collision object does not collide. In other words, a decrease in the appearance of the vehicle bumper in which the collision detection means of this embodiment is assembled is suppressed.

(Example 2)
The collision detection means of the present embodiment includes a bumper reinforcement 1, a chamber member 2, a pressure sensor 3, an absorber 4, and a calculation means (not shown). The structure of the collision detection means of the present embodiment is shown in FIGS. FIG. 4 is a diagram showing the configuration of the collision detection means of the present embodiment, and FIG. 5 is a diagram showing a cross section taken along line II-II in FIG.

  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 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 4 is a member made of foamed resin arranged on the front surface of the bumper reinforcement 1 on the vehicle side. The absorber 4 is formed in a curved shape in which the surface facing the bumper reinforcement 1 is curved along the inner peripheral surface of the bumper cover of the vehicle bumper.

  The chamber member 2 is a substantially columnar member having a square cross section with the chamber space 20 defined therein, and a central axis extending along the curved shape of the bumper cover. The chamber member 2 has a substantially constant shape in a cross section perpendicular to the axial direction. The chamber member 2 was fixed and arranged on the curved surface of the absorber 4. That is, the chamber member 2 is a hollow member that has a rectangular cross section in the front-rear direction of the vehicle and extends along the absorber 4 in the width direction of the vehicle.

  The pressure sensor 3 is a sensor for measuring the pressure of the chamber space 20 of the chamber member 2 and is assembled to the chamber member 2.

  The calculation means is connected to the pressure sensor 4 and calculates the pressure of the chamber space 20 from the detection signal of the pressure sensor 3 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.

  In the collision detection means of the present embodiment, as in the first embodiment, the bumper cover 5 covers the surface of the chamber member 2 to form the outer surface of the bumper of the vehicle. FIG. 6 shows the configuration of the bumper of the vehicle in which the collision detection means is assembled.

  In the collision detection means of the present embodiment, the chamber member 2 having a substantially constant cross section is disposed on the outer periphery of the vehicle. The collision object collides against the bumper cover 5 and the collision object presses the chamber member 2. Sometimes, the deformation amount of the chamber member 2 is not dependent on the collision position of the collision object. That is, the collision detection unit has a detection result whose detection result does not change depending on the collision position of the collision object, and the collision detection unit has excellent detection accuracy.

(Example 3)
The collision detection means of the present embodiment includes a bumper reinforcement 1, a chamber member 2, a pressure sensor 3, and a calculation means (not shown). The structure of the collision detection means of the present embodiment is shown in FIGS. FIG. 7 is a top view of the collision detection means of the present embodiment, FIG. 8 is a front view of the collision detection means of the present embodiment, and FIG. 9 is a cross-sectional view taken along line III-III in FIG. FIG. 10 is a cross-sectional view taken along line IV-IV in FIG.

  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 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 chamber member 2 is a member that divides the chamber space 20 therein, and is a member that is fixed and arranged on the surface of the bumper reinforcement 1.

  The surface of the chamber member 2 facing the bumper reinforcement 1 is formed in a curved shape that is curved along the inner peripheral surface of the bumper cover of the vehicle bumper. In addition, the chamber member 2 has a thin vehicle-direction thickness at a center portion (a portion where the length of the chamber member 2 in the longitudinal direction of the vehicle is long) in the vehicle width direction, and both end portions (chamber member 2). The portion of the vehicle having a short length in the front-rear direction) is formed to be thick. That is, when the chamber member 2 is viewed from the front, it is formed in a substantially H shape.

  The chamber member 2 was adjusted in the vehicle front-rear method by changing the thickness in the height direction of the vehicle. More specifically, the pressure change became the same because the deformation amount due to the collision under the same condition became constant regardless of the width direction portion.

  The pressure sensor 3 is a sensor for measuring the pressure of the chamber space 20 of the chamber member 2 and is assembled to the chamber member 2.

  The computing means is connected to the pressure sensor 3 and calculates the pressure in the chamber space 20 from the detection signal of the pressure sensor 3 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.

  In the collision detection means of the present embodiment, as in the first embodiment, the bumper cover 5 covers the surface of the chamber member 2 to form the outer surface of the bumper of the vehicle. FIG. 11 shows the configuration of the bumper of the vehicle in which the collision detection means is assembled.

  The collision detection means of the present embodiment is formed so that the thickness of the chamber member 2 (thickness in the vehicle height direction) differs in the vehicle width direction. With this structure, the amount of deformation when a collision object collides with the center in the width direction of the vehicle is the same as the amount of deformation when the collision object collides with the end of the vehicle in the width direction. . That is, the collision detection unit has a detection result whose detection result does not change depending on the collision position of the collision object, and the collision detection unit has excellent detection accuracy.

Example 4
The collision detection means of the present embodiment includes a bumper reinforcement 1, a chamber member 2, a pressure sensor 3, and a calculation means (not shown). The structure of the collision detection means of a present Example was shown to FIGS. FIG. 12 is a top view showing the configuration of the collision detection means of this embodiment, and FIG. 13 is a cross-sectional view taken along the line VV of FIG.

  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 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 chamber member 2 is a member that divides the chamber space 20 therein, and is a member that is fixed and arranged on the surface of the bumper reinforcement 1.

  The surface of the chamber member 2 facing the bumper reinforcement 1 is formed in a curved shape that is curved along the inner peripheral surface of the bumper cover of the vehicle bumper. Further, the chamber member 2 has a plurality of cavities 25 opened on the surface facing the bumper reinforcement 1.

  The chamber member 2 has a plurality of cavities 25 to adjust the deformation of the vehicle front-rear method. By having the cavity 25, the pressure change due to the collision under the same conditions became the same regardless of the width direction portion. More specifically, by having the cavity 25, the wall portion 250 defining the cavity 25 is provided. The wall portion 250 is formed in a state of extending in the front-rear direction of the vehicle, and when a colliding object collides, the wall portion 250 exhibits a rib effect and the chamber member 2 is deformed in the front-rear direction of the vehicle. As well as the deformation volume (volume change) of the chamber. Due to this effect, the chamber member 2 is not easily deformed partially, and as a result, the overall ease of deformation is uniform, and the volume of chamber deformation under the same collision condition is also the same.

  The cavity 25 formed in the chamber member 2 of the present embodiment has a different depth from the opening in the vehicle width direction. By varying the depth from the opening, the ease of deformation of the chamber member 2 by the cavity 25 and the volume change amount of the chamber were appropriately adjusted.

  Moreover, although the cavity 25 of the chamber member 2 of the present embodiment is formed so as to have a circular cross section, the cross sectional shape may be a square shape instead of a circular shape. Further, the diameter of the cavity 25 is not particularly limited.

  The pressure sensor 3 is a sensor for measuring the pressure of the chamber space 20 of the chamber member 2 and is assembled to the chamber member 2.

  The calculation means is connected to the pressure sensor 3 and calculates the pressure in the chamber space 20 from the detection signal of the pressure sensor 3 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.

  In the collision detection means of the present embodiment, as in the first embodiment, the bumper cover 5 covers the surface of the chamber member 2 to form the outer surface of the bumper of the vehicle.

  In the collision detection means of this embodiment, since the chamber member 2 has the cavity 25, the deformation amount when the collision object collides with the center part in the width direction of the vehicle and the collision object at the end part in the width direction of the vehicle. The amount of deformation when colliding has become the same. That is, the collision detection unit has a detection result whose detection result does not change depending on the collision position of the collision object, and the collision detection unit has excellent detection accuracy.

(Example 5)
The collision detection unit of the present embodiment has the same configuration as that of the fourth embodiment except that the cavity 25 is filled with a soft foamed resin 251. The configuration of the collision detection means of this embodiment is shown in FIG.

  The collision detection means of the present embodiment provides the strength of the fourth embodiment by giving the foam resin 251 strength sufficient to prevent the collapse characteristics of the chamber member 2 from changing even if the inside of the cavity 25 is filled with the soft foam resin 251. The same effect as time.

(Example 6)
The collision detection means of the present embodiment has the same configuration as that of the fourth embodiment except that a through hole 26 penetrating the chamber member 2 is formed instead of the cavity 25. The structure of the collision detection means of a present Example was shown to FIGS. FIG. 15 is a top view showing the configuration of the collision detection means of this embodiment, and FIG. 16 is a cross-sectional view taken along the line VI-VI of FIG.

  The chamber member 2 is a member that divides the chamber space 20 therein, and is a member that is fixed and arranged on the surface of the bumper reinforcement 1.

  The surface of the chamber member 2 facing the bumper reinforcement 1 is formed in a curved shape that is curved along the inner peripheral surface of the bumper cover of the vehicle bumper.

  The chamber member 2 has a plurality of through holes 26 penetrating the surface facing the bumper reinforcement 1 and the surface facing the bumper reinforcement 1, so that the deformation of the vehicle front-rear method and the volume change of the chamber are reduced. Adjusted. The through hole 26 functions in the same manner as the cavity 25 of the fourth embodiment.

  The through hole 26 formed in the chamber member 2 of the present embodiment is formed so as to have a circular cross section, but the cross sectional shape may be a square shape instead of a circular shape. Further, the diameter of the through hole 26 having a circular cross section is not particularly limited.

  In the through hole 26 provided in the chamber member 2 of the present embodiment, the inner diameter of the through hole 26 located on the end side in the vehicle width direction is smaller than the inner diameter of the through hole 26 located on the center side. Is formed. As a result, the central portion exhibits an effect that the through-hole 26 is less likely to collapse the chamber member 2 than the end portion, and the chamber member 2 is more easily crushed, and the chamber deformation volume at the same collision condition is also increased. It became the same.

  As in the case of the fourth embodiment, the bumper cover 5 covers the surface of the chamber member 2 to form the outer surface of the bumper of the vehicle.

  The collision detection means of the present embodiment is such that the chamber member 2 has the through-hole 26 so that the deformation amount when the collision object collides with the center portion in the width direction of the vehicle and the collision object at the end portion in the width direction of the vehicle. The amount of deformation when colliding has become the same. That is, the collision detection unit has a detection result whose detection result does not change depending on the collision position of the collision object, and the collision detection unit has excellent detection accuracy.

(Example 7)
The collision detection means of this embodiment has the same configuration as that of Embodiment 6 except that the through-hole 26 is filled with a soft foamed resin 261. The configuration of the collision detection means of this embodiment is shown in FIG.

  The collision detection means of the present embodiment provides the foamed resin 261 with a strength that does not change the crushing characteristics of the chamber member 2 even when the inside of the through hole 26 is filled with the soft foamed resin 261. The same effect as in the case of.

(Example 8)
The present embodiment has the same configuration as that of the fourth embodiment except that the chamber member 2 has a reinforcing rib 27 instead of the cavity 25. The configuration of the collision detection means of this embodiment is shown in FIGS. FIG. 18 is a top view showing the configuration of the collision detection means of the present embodiment, and FIG. 19 is a view showing a cross section taken along line VII-VII in FIG.

  A plurality of reinforcing ribs 27 are provided on the inner surface defining the chamber space 20 of the chamber member 2 in a state of extending in the vehicle front-rear direction.

  The collision detection means of the present embodiment is such that the chamber member 2 has the reinforcing rib 27 so that the deformation amount when the collision object collides with the center portion in the width direction of the vehicle and the end portion in the width direction of the vehicle. The amount of deformation when objects collide is the same. That is, the collision detection unit has a detection result whose detection result does not change depending on the collision position of the collision object, and the collision detection unit has excellent detection accuracy.

Example 9
The collision detection unit of the present embodiment includes a bumper reinforcement 1, a chamber member 2, a pressure sensor 3, and a calculation unit (not shown). The structure of the collision detection means of a present Example was shown to FIGS. 20 is a front view showing the configuration of the collision detection means of the present embodiment, and FIG. 21 is a view showing a cross section taken along the line VI-VI of FIG.

  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 with screws 6 in a state in which the extending direction of the band extends along the width direction of the vehicle. 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 chamber member 2 is a member that divides the chamber space 20 therein, and is a member that is disposed and fixed on the surface of the bumper reinforcement 1.

  The chamber member 2 has a wave shape (a shape meandering on the surface of the bumper reinforcement 1) extending in the vehicle width direction (the direction in which the bumper reinforcement 1 extends) and having an amplitude in the vertical direction of the vehicle. . In the state where the chamber member 2 is fixed to the bumper reinforcement 1, a waveform (screw 6 is a wave peak or valley where the screw 6 for fixing the bumper reinforcement 1 to the front side member is exposed is exposed. The chamber member 2 is formed in a shape located in the interior).

  Furthermore, the waveform shape of the chamber member 2 is a shape in which the same amplitude is repeated. That is, the chamber member 2 has a form in which the unit shape is continuously repeated with one wavelength of the waveform shape as the unit shape. In the chamber member 2, the volume of the chamber space 20 (the volume of the chamber member 2) corresponding to one wavelength of the waveform shape is constant in any part in the vehicle width direction. Moreover, the shape of the wall part which comprises the chamber member 2 (dividing the chamber space 20) is also constant. That is, the chamber member 2 has a constant crushing characteristic in the width direction of the vehicle, and the deformation volume of the chamber under the same collision condition is also the same.

  The pressure sensor 3 is a sensor for measuring the pressure of the chamber space 20 of the chamber member 2 and is assembled to the chamber member 2.

  The calculation means is connected to the pressure sensor 3 and calculates the pressure in the chamber space 20 from the detection signal of the pressure sensor 3 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.

  In the collision detection means of the present embodiment, as in the first embodiment, the bumper cover 5 covers the surface of the chamber member 2 to form the outer surface of the bumper of the vehicle.

  The collision detection means of the present embodiment is such that the chamber member 2 has a shape in which the same shape is repeated in the width direction of the vehicle. The deformation amount of 2 is constant, and the change in the pressure of the chamber space 20 is the same. That is, the collision detection unit has a detection result whose detection result does not change depending on the collision position of the collision object, and the collision detection unit has excellent detection accuracy.

  Moreover, since the screw 6 is exposed, the collision detection means of the present embodiment can assemble the bumper reinforcement 1 with the chamber member 2 disposed. As a result, it became a collision detection means excellent in assemblability.

(Example 10)
The collision detection unit of the present embodiment includes a bumper reinforcement 1, a chamber member 2, a pressure sensor 3, and a calculation unit (not shown). The structure of the collision detection means of a present Example was shown to FIGS. 22 is a front view showing the configuration of the collision detection means of the present embodiment, and FIG. 23 is a view showing a cross section taken along line VII-VII in FIG.

  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 with screws 6 in a state in which the extending direction of the band extends along the width direction of the vehicle. 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 chamber member 2 is a member that divides the chamber space 20 therein, and is a member that is disposed and fixed on the surface of the bumper reinforcement 1.

  The surface of the chamber member 2 facing the bumper reinforcement 1 is formed in a curved shape that is curved along the inner peripheral surface of the bumper cover of the vehicle bumper. Further, when the chamber member 2 is assembled to the bumper reinforcement 1, a slit 22 penetrating the chamber member 2 is formed on the front side of the screw 6. The slit 22 is formed so as to extend in the width direction of the vehicle. The slit 22 does not cross the chamber member 2 at both ends in the extending direction. That is, the chamber space 20 is formed at both ends of the slit 22. A pair of opposed inner surfaces 22a and 22b that define the slit 22 are in contact with each other.

  Furthermore, the wall parts 23a and 23b of the chamber member 2 that divides the slit 22 are softer than other parts (for example, parts that divide the front side and rear side surfaces of the chamber member 2) (deformed easily). It is formed of material and softening shape.

  In this embodiment, when two screws 6 are adjacent to each other in the direction in which the slit 22 extends, one slit 22 is formed in front of the two screws 6 and 6. That is, a plurality of screws are passed through one slit 22.

  The pressure sensor 3 is a sensor for measuring the pressure of the chamber space 20 of the chamber member 2 and is assembled to the chamber member 2.

  The calculation means is connected to the pressure sensor 3 and calculates the pressure in the chamber space 20 from the detection signal of the pressure sensor 3 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.

  In the collision detection means of the present embodiment, as in the first embodiment, the bumper cover 5 covers the surface of the chamber member 2 to form the outer surface of the bumper of the vehicle.

  In the collision detection means of the present embodiment, the pressure in the chamber space 20 changes even if a collision object collides with any location in the width direction of the vehicle. At this time, since the pair of opposed inner surfaces 22a and 22b defining the slit 22 are in contact with each other, the wall portions 23a and 23b are not deformed even when the pressure of the chamber space 20 is increased. From this, even if it has composition which has slit 22, pressure change similar to the case where it does not have slit 22 arises. That is, the collision detection unit of the present embodiment is a collision detection unit whose detection result does not change depending on the collision position of the collision object, and is a collision detection unit with excellent detection accuracy.

  Moreover, since the collision detection means of a present Example is formed with the slit 22 in the part in which the screw | thread 6 is inserted, the assembly | attachment of the bumper reinforcement 1 can be performed in the state which has arrange | positioned the chamber member 2. FIG. That is, as shown in FIG. 24, the assembly can be performed by passing the screw 6 through the slit 22 during the assembly. Due to the flexibility of the wall portions 23a and 23b that define the slit 22, after the screw 6 passes, the slit 22 is closed and the inner surfaces 22a and 22b come into contact with each other. As a result, it became a collision detection means excellent in assemblability.

(Example 11)
The present embodiment is a collision detection unit similar to the tenth embodiment except that the shape of the slit 22 is different. The structure of the collision detection means of the present embodiment is shown in FIG.

  In the present embodiment, the slit 22 has a shape extending in the vertical direction of the vehicle and extending upward or downward, and divides the upper surface or the lower surface of the chamber member 2. Further, the slit 22 has a chamber space formed on the side opposite to the extending direction, and does not cross the chamber member 2 (the surface on the lower side or the upper side is not divided).

  Even if the shape of the slit 22 is changed, the collision detection means of the present embodiment exhibited the same effect as that of the tenth embodiment.

  In the above embodiment, the chamber member 2 constituting the chamber space 20 serves as an energy absorption absorber in the bumper, but is not limited to this configuration. For example, the same effect can be obtained even if an absorber is constituted by an iron plate and the chamber member 2 is arranged in the absorber space. At this time, the collapse characteristic of the entire bumper can be adjusted by adjusting the collapse characteristic of the chamber member 2.

It is the figure which showed the structure of the collision detection system of Example 1. FIG. It is sectional drawing which showed the structure of the collision detection system of Example 1. FIG. It is the figure which showed the state when the collision detection system of Example 1 was assembled | attached to the bumper of the vehicle. It is the figure which showed the structure of the collision detection system of Example 2. FIG. It is sectional drawing which showed the structure of the collision detection system of Example 2. FIG. It is the figure which showed the state when the collision detection system of Example 2 was assembled | attached to the bumper of the vehicle. It is the figure which showed the structure of the collision detection system of Example 3. FIG. It is the front view which showed the structure of the collision detection system of Example 3. It is sectional drawing which showed the structure of the collision detection system of Example 3. It is sectional drawing which showed the structure of the collision detection system of Example 3. It is the figure which showed the state when the collision detection system of Example 3 was assembled | attached to the bumper of the vehicle. It is the figure which showed the structure of the collision detection system of Example 4. FIG. It is sectional drawing which showed the structure of the collision detection system of Example 4. It is sectional drawing which showed the structure of the collision detection system of Example 5. FIG. It is the figure which showed the structure of the collision detection system of Example 6. FIG. It is sectional drawing which showed the structure of the collision detection system of Example 6. It is sectional drawing which showed the structure of the collision detection system of Example 7. It is the figure which showed the structure of the collision detection system of Example 8. FIG. It is sectional drawing which showed the structure of the collision detection system of Example 8. It is the figure which showed the structure of the collision detection system of Example 9. FIG. It is sectional drawing which showed the structure of the collision detection system of Example 9. FIG. It is the figure which showed the structure of the collision detection system of Example 10. FIG. It is sectional drawing which showed the structure of the collision detection system of Example 10. FIG. It is the figure which showed the structure at the time of the assembly | attachment of the collision detection system of Example 10. FIG. It is the figure which showed the structure of the collision detection system of Example 11. FIG. It is the figure which showed the pressure change of the chamber member in the collision site | part. It is the figure which showed the pressure change of the chamber member in the collision site | part. It is the figure which showed the structure of the collision detection system to which the conventional structure was applied. It is sectional drawing which showed the structure of the collision detection system to which the conventional structure was applied.

Explanation of symbols

1: Bumper reinforcement 10: Near central portion 11: Both ends 12: Tapered portion 2: Chamber member 20: Chamber space 22: Slit 3: Pressure sensor 4: Absorber 25: Cavity 26: Through hole 27: Reinforcing rib 5: Bumper cover 6: Screw

Claims (13)

A back plate fixed to a side member of the vehicle;
A chamber member disposed in front of the back plate and defining a sealed chamber space;
A pressure sensor for detecting the pressure in the chamber space;
A collision detection means for detecting a collision between the vehicle and a collision object from fluctuations in pressure in the chamber space,
When the collision conditions other than the collision position of the chamber member are substantially the same, the deformation volume of the chamber member generated by the collision is substantially constant regardless of the location of the chamber member. A collision detection means. The chamber member is arranged in a state extending along the width direction of the vehicle,
The collision detection means according to claim 1, wherein a pressing member formed to be harder than the chamber member is disposed in front of the chamber member.   The collision detection means according to claim 1, wherein the chamber member is disposed on a surface of the back plate, and a surface facing the back plate is formed along the outer peripheral surface of the vehicle. On the surface of the back plate, a pressing member formed to be harder than the chamber member is disposed,
The chamber member is disposed on the surface of the pressing member in a state where the axial direction is curved along the outer peripheral surface of the vehicle, and has a substantially columnar shape with a constant cross-sectional shape in a cross section perpendicular to the axial direction. The collision detection means according to 1.   The collision detection means according to claim 1, wherein the chamber member has a cavity communicating with the outside.   The collision detection means according to claim 1, wherein the chamber member is formed such that a partition wall that partitions the chamber space is partially thick. A back plate fixed to a side member of the vehicle;
A fixing member that penetrates at least the back plate and fixes the side member and the back plate;
A chamber member disposed in front of the back plate and defining a sealed chamber space;
A pressure sensor for detecting the pressure in the chamber space;
A collision detection means for detecting a collision between the vehicle and a collision object from fluctuations in pressure in the chamber space,
The collision detection means characterized in that the chamber member has a shape that avoids the front of the fixing member, and is formed so that a unit shape is continuously repeated in the width direction of the vehicle.   The collision detection means according to claim 7, wherein the chamber member has a meandering shape on the surface of the back plate.   When the chamber member has the same collision object and the velocity at the time of the collision, the deformation volume of the chamber member generated by the collision is substantially constant regardless of the location of the chamber member in the width direction of the vehicle. 8. The collision detection means according to claim 7.   The collision detection means according to claim 7, wherein the fixing member is at least one of a bolt, a rivet, and a securing hook. A back plate fixed to a side member of the vehicle;
A fixing member that penetrates at least the back plate and fixes the side member and the back plate;
A chamber member disposed in front of the back plate and defining a sealed chamber space;
A pressure sensor for detecting the pressure in the chamber space;
A collision detection means for detecting a collision from pressure fluctuations in the chamber space,
The collision detection means characterized in that the chamber member has a slit extending in at least one direction in front of the fixing member.   The collision detection means according to claim 11, wherein the slit formed in the chamber member is in contact with the opposed inner surface.   12. The collision detection means according to claim 11, wherein the chamber member is made of a material that can be deformed at the time of collision, and a portion of the chamber member that defines the slit is formed to be softer than other portions.

Images