JP2018167696A - Vehicle collision determination device - Google Patents

Abstract

To provide a vehicle collision determination device which can more surely suppress pressure fluctuation in a sensor tube when a road obstruction other than a pedestrian collides with a bumper.SOLUTION: A vehicle collision determination device comprises: a bumper beam 10 extended in a vehicle width direction; a bumper face 20 which is arranged in front of the bumper beam 10 and is extended in the vehicle width direction; an impact absorbing member 30 arranged between the bumper beam 10 and the bumper face 20; and a sensor tube 40 arranged between the impact absorbing member 30 and the bumper beam 10. The impact absorbing member 30 is formed in such a manner that its lower portion is discontinuous between its front end portion and its rear end portion.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicle collision determination device in which an impact absorbing member and a sensor tube are disposed between a bumper beam and a bumper face.

  In order to detect a collision with a pedestrian, a vehicle collision determination device is known in which an impact absorbing member and a sensor tube are arranged between a bumper beam and a bumper face (see, for example, Patent Document 1). This vehicle collision determination device has a protrusion that is formed on the lower side in the vehicle vertical direction of the shock absorbing member, and the front surface in the vehicle front-rear direction projects from the general surface to the vehicle front side. As a result, when a road obstacle such as a roadside marker collides with the vehicle, it is possible to reduce the transmission of load to the sensor tube by pushing down the road obstacle with the protrusion on the lower side of the shock absorbing member. It is supposed that the collision detection by the person collision detection sensor can be suppressed.

JP2015-131508A

  However, in the vehicle collision determination device described in Patent Document 1, in the case where the obstacle on the road cannot be pushed down, a large load acts on the shock absorbing member, and the collision is detected by the sensor tube.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to more reliably suppress pressure fluctuation in the sensor tube when an obstacle on the road other than a pedestrian collides with a bumper. An object of the present invention is to provide a vehicle collision determination device that can perform the above-described operation.

  In order to achieve the above object, according to the present invention, a bumper beam extending in the vehicle width direction, a bumper face disposed in front of the bumper beam and extending in the vehicle width direction, and an impact disposed between the bumper beam and the bumper face. And a sensor tube disposed between the shock absorbing member and the bumper beam, and the shock absorbing member has a lower side formed discontinuously on the front end side and the rear end side. A collision determination device is provided.

According to this vehicle collision determination device, when a pedestrian collides with the bumper, the leg portion of the pedestrian comes into contact with the bumper in the vertical direction. At this time, since the center of gravity of the pedestrian is above the bumper, a load is applied obliquely downward from the upper end side of the front end to the shock absorbing member via the bumper face. The shock absorbing member is sequentially pressed and deformed from the upper part of the front part toward the lower part of the rear part. At this time, the deformed impact absorbing member presses the sensor tube, and it is detected that the pedestrian collides with the bumper due to the pressure fluctuation in the sensor tube.
On the other hand, when road obstacles such as road markers and small animals come into contact with the bumper, a load is applied obliquely upward from the lower end side of the front end to the shock absorbing member via the bumper face. The shock absorbing member is sequentially pressed and deformed from the lower part of the front part toward the upper part of the rear part. Here, since the lower side of the shock absorbing member is formed discontinuously on the front end side and the rear end side, the front end side is deformed toward the rear upper side independently of the rear end side, and the rear end side Deformation is suppressed. Therefore, it is difficult to press the sensor tube, and the pressure fluctuation in the sensor tube is greatly reduced as compared with the case of a pedestrian.

  In the vehicle collision determination apparatus, the impact absorbing member may have a cutout portion that is discontinuous between the front end side and the rear end side on the lower side.

  Moreover, the said collision determination apparatus for vehicles WHEREIN: The said impact-absorbing member may have a notch part which makes the front end side and the rear-end side discontinuous in the lower side.

  In the vehicle collision determination device, the shock absorbing member is continuously formed at a position higher than the sensor tube with a predetermined vertical dimension from the front end to the rear end of the shock absorbing member. You may have.

  According to this vehicle collision determination device, a sufficient energy absorption amount at the time of the collision can be ensured by the continuous forming unit.

  In the vehicle collision determination device, the impact absorbing member may have a front-end vertical dimension that is the same as or larger than the vertical dimension of other portions in a side cross-section.

  According to this vehicle collision determination device, the area of the front end of the shock absorbing member can be increased to increase the energy absorption amount at the initial stage of the collision.

  According to the present invention, when a road obstacle other than a pedestrian collides with a bumper, pressure fluctuation in the sensor tube can be more reliably suppressed.

It is a schematic perspective view of the front part of the automobile vehicle which shows one Embodiment of this invention and shows the installation state of a sensor tube. It is explanatory drawing which shows the positional relationship of a pedestrian and a bumper. It is a section explanatory view of a bumper structure. When a pedestrian collides, it is explanatory drawing which shows the state to which a load is added toward diagonally downward to an impact-absorbing member. It is explanatory drawing which shows the deformation | transformation state of the impact-absorbing member when a pedestrian collides. It is explanatory drawing which shows the crushing state of the impact-absorbing member when a pedestrian collides. It is explanatory drawing which shows the deformation | transformation state of the impact-absorbing member when the obstacle on a road collides. It is sectional explanatory drawing of the bumper structure which shows a modification. It is explanatory drawing which shows the deformation | transformation state of the impact-absorbing member when the obstacle on a road collides.

  1 to 7 show an embodiment of the present invention, FIG. 1 is a schematic perspective view of a front portion of an automobile vehicle showing an installation state of a sensor tube, and FIG. 2 is an explanatory view showing a positional relationship between a pedestrian and a bumper. 3 is a cross-sectional explanatory view of the bumper structure, FIG. 4 is an explanatory view showing a state in which a load is applied obliquely downward to the shock absorbing member when a pedestrian collides, and FIG. 5 is a shock absorption when the pedestrian collides. FIG. 6 is an explanatory diagram showing the collapsed state of the shock absorbing member when a pedestrian collides, and FIG. 7 is an explanatory diagram showing the deformed state of the shock absorbing member when an obstacle on the road collides. FIG. Note that FIG. 1 does not show the bumper face and the impact absorbing member for the sake of explanation.

  This automobile vehicle has a vehicle body in which panel-like members obtained by press-molding, for example, iron-based and aluminum-based metal plates are assembled and joined by spot welding or the like. As shown in FIG. 1, the automobile vehicle has a bumper beam 10 that extends in the vehicle width direction as a vehicle body. The bumper beam 10 is connected to a pair of left and right side frames extending in the front-rear direction. The bumper beam 10 is curved and formed so that the center portion projects forward from the end portions in the vehicle width direction. As shown in FIG. 2, the bumper beam 10 is formed so that a cross section in a side view is a closed cross section.

  As shown in FIG. 2, a bumper face 20 extending in the vehicle width direction is disposed in front of the bumper beam 10. The bumper face 20 is made of, for example, resin, and the front surface forms the design surface of the automobile vehicle.

  As shown in FIG. 2, an impact absorbing member 30 is disposed between the bumper beam 10 and the bumper face 20. The impact absorbing member 30 is made of, for example, foamed resin, and can be made of, for example, urethane foam. As shown in FIG. 2, the height of the shock absorbing member 30 is approximately in the vicinity of the knee of the leg of the pedestrian when a general adult male is assumed.

  As shown in FIG. 3, the shock absorbing member 30 has a rear end fixed to the bumper beam 10, and a concave receiving portion 31 for receiving the sensor tube 40 is formed at a predetermined position in the vertical direction at the rear end of the shock absorbing member 30. The The lower side of the shock absorbing member 30 is formed discontinuously on the front end side and the rear end side. Specifically, the shock absorbing member 30 has a notch 32 on the lower side that makes the front end side and the rear end side discontinuous. In the present embodiment, the lower surface 33 of the shock absorbing member 30 is formed substantially horizontally, and the notch 32 is formed in a rectangular shape.

  As shown in FIG. 3, the sensor tube 40 is disposed between the impact absorbing member 30 and the bumper beam 10. As shown in FIG. 1, the sensor tube 40 is disposed so as to extend in the vehicle width direction along the front surface of the bumper beam 10. The sensor tube 40 is made of, for example, resin and has a circular cross section. At both ends of the sensor tube 40, a pressure detector for detecting a pressure change in the tube is connected. When the sensor tube 40 is pressed and deformed, a signal corresponding to the pressure change is output from the pressure detection unit to the ECU. Based on the signal, the ECU determines whether the collision object to the bumper is a pedestrian or a road obstacle such as a road marker or a small animal.

  As shown in FIG. 3, the shock absorbing member 30 has a continuous forming portion 34 that is continuously formed from the frontmost end to the rearmost end of the shock absorbing member 30 at a predetermined vertical dimension at a position higher than the sensor tube 40. . The vertical dimension of the continuous forming portion 34 is preferably set to 1/3 or less of the entire vertical dimension of the shock absorbing member 30, and is 1/3 in the present embodiment.

  Further, in the present embodiment, the upper surface 35 of the shock absorbing member 30 is formed substantially horizontally, and the shock absorbing member 30 has a side cross-section and the vertical dimension of the front end is the same as or larger than the vertical dimension of other parts. It has become.

  According to the vehicle collision determination device configured as described above, when a pedestrian collides with the bumper, as shown in FIG. 4, the pedestrian's leg vicinity contacts the bumper in the vertical direction. At this time, since the center of gravity of the pedestrian is above the bumper, a load is applied to the shock absorbing member 30 via the bumper face 20 obliquely downward from the upper end side of the front end. And as shown in FIG. 5, the impact-absorbing member 30 is sequentially pressed and deformed from the upper part of the front part toward the lower part of the rear part. At this time, it is detected that the deformed shock absorbing member 30 presses the sensor tube 40 and the pedestrian collides with the bumper due to the pressure fluctuation in the sensor tube 40. As shown in FIG. 6, the shock absorbing member 30 continues to be deformed after this, and eventually collapses thinly in the front-rear direction.

  On the other hand, when road obstacles such as road markers and small animals come into contact with the bumper, a load is applied to the shock absorbing member 30 via the bumper face 20 obliquely upward from the lower end side of the front end. Then, as shown in FIG. 7, the shock absorbing member 30 is sequentially pressed and deformed from the lower part of the front part toward the upper part of the rear part. Here, since the lower side of the shock absorbing member 30 is formed discontinuously on the front end side and the rear end side, the front end side is deformed toward the rear upper side independently of the rear end side, and the rear end side Is prevented from being deformed. Therefore, it is difficult to press the sensor tube 40, and the pressure fluctuation in the sensor tube 40 is significantly reduced as compared with the case of a pedestrian.

  As a result, the ECU can reliably determine whether the collision object against the bumper is a pedestrian or a road obstacle such as a road marker or a small animal. Therefore, the pressure fluctuation in the sensor tube 40 can be suppressed without pushing down an obstacle on the road as conventionally known.

  Further, according to the vehicle collision determination device of the present embodiment, since the shock absorbing member 30 has the continuous forming portion 34 that is continuously formed from the front end to the rear end, sufficient energy absorption at the time of the collision is achieved. The amount is secured. Here, the vertical dimension of the continuous forming portion 34 is 1/3 or less of the vertical dimension of the entire shock absorbing member 30, and as shown in FIG. 6, when the shock absorbing member 30 is crushed in the front-rear direction at the time of a collision, The absorbing member 30 enters the portion other than the continuous forming portion 34 and is deformed, and finally is thinly crushed in the front-rear direction. Thereby, reduction of the input to a pedestrian from the bumper side can be aimed at.

  Moreover, according to the vehicle collision determination apparatus of the present embodiment, the shock absorbing member 30 has a side cross-section, and the vertical dimension of the front end is the same as or larger than the vertical dimension of other parts. Thereby, the area of the front end of the shock absorbing member 30 can be increased, and the energy absorption amount at the initial stage of the collision can be increased.

  In addition, if the lower side of the shock absorbing member 30 is formed discontinuously on the front end side and the rear end side, the shape of the shock absorbing member 30 can be arbitrarily changed according to the specifications, required performance, and the like of the automobile. For example, as shown in FIG. 8, a cut portion 132 may be formed on the lower side of the shock absorbing member 130 instead of the cutout portion 32 of the above embodiment. The shock absorbing member 130 has a lower surface 133 inclined downward toward the rear and an upper surface 135 inclined upward toward the rear. Even in the case of this shock absorbing member 130, as shown in FIG. 9, when an obstacle on the road contacts the bumper, the front end side is deformed toward the rear upper side independently of the rear end side, and the rear end side is changed. Deformation is suppressed.

  While the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

DESCRIPTION OF SYMBOLS 10 Bumper beam 20 Bumper face 30 Shock absorption member 31 Receiving part 32 Notch part 33 Lower surface 34 Continuous formation part 35 Upper surface 40 Sensor tube 130 Shock absorption member 132 Cut part 133 Lower surface 135 Upper surface

Claims (5)

A bumper beam extending in the vehicle width direction,
A bumper face disposed in front of the bumper beam and extending in the vehicle width direction;
An impact absorbing member disposed between the bumper beam and the bumper face;
A sensor tube disposed between the shock absorbing member and the bumper beam,
The impact absorbing member is a vehicle collision determination device in which a lower side is formed discontinuously on a front end side and a rear end side.   2. The vehicle collision determination device according to claim 1, wherein the shock absorbing member has a cutout portion in which a front end side and a rear end side are discontinuous on a lower side.   2. The vehicle collision determination device according to claim 1, wherein the impact absorbing member has a notch portion on the lower side, the front end side and the rear end side being discontinuous.   The said shock-absorbing member has a continuous formation part continuously formed in the position higher than the said sensor tube by the predetermined | prescribed vertical dimension from the foremost end of the said shock-absorbing member to the last end. The vehicle collision determination device according to claim 1.   5. The vehicle collision determination device according to claim 1, wherein the impact absorbing member has a side cross-section in which a vertical dimension of a front end is the same as or larger than a vertical dimension of other portions.

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