JP6912241B2 - Vehicle collision detection device - Google Patents

Description

The present invention relates to a vehicle collision detection device in which a shock absorbing member and a sensor tube are arranged between a bumper beam and a bumper face.

A vehicle collision detection device in which a shock absorbing member and a sensor tube are arranged between a bumper beam and a bumper face in order to detect a collision with a pedestrian is known (see, for example, Patent Document 1). This vehicle collision determination device is formed on the lower side of the shock absorbing member in the vehicle vertical direction, and has a protrusion in which 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 a vehicle, the load transmission to the sensor tube can be reduced by pushing down the road obstacle with the protrusion on the lower side of the shock absorbing member, and walking. It is said that it is possible to suppress the detection of a collision by a human collision detection sensor.

Japanese Unexamined Patent Publication No. 2015-131508

However, in the vehicle collision detection device described in Patent Document 1, when an obstacle on the road cannot be pushed down, a large load is applied to 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 an object of the present invention is to more reliably suppress pressure fluctuations in the sensor tube when a road obstacle other than a pedestrian collides with a bumper. It is an object of the present invention to provide a collision determination device for a vehicle.

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

According to this vehicle collision detection device, when a pedestrian collides with the bumper, the vicinity of the pedestrian's leg 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 to the shock absorbing member via the bumper face diagonally downward from the upper end side of the front end. Then, the shock absorbing member is sequentially pressed and deformed from the upper portion of the front portion toward the lower portion of the rear portion. At this time, the deformed shock 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 a road obstacle such as a road marker or a small animal comes into contact with the bumper, a load is applied to the shock absorbing member via the bumper face diagonally upward from the lower end side of the front end. Then, the shock absorbing member is sequentially pressed and deformed from the lower front portion to the upper rear portion. Here, since the lower side of the shock absorbing member is discontinuously formed between 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 significantly reduced as compared with the case of a pedestrian.

Further, in the vehicle collision detection device, the shock absorbing member may have a notch on the lower side that discontinues the front end side and the rear end side.

Further, in the vehicle collision detection device, the shock absorbing member may have a notch on the lower side so that the front end side and the rear end side are discontinuous.

Further, in the vehicle collision detection 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 rearmost end of the shock absorbing member. May have.

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

Further, in the vehicle collision detection device, the vertical dimension of the front end of the shock absorbing member may be the same as or larger than the vertical dimension of the other portion in the 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 amount of energy absorbed at the initial stage of the collision.

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

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 between a pedestrian and a bumper. It is sectional drawing which shows the bumper structure. It is explanatory drawing which shows the state which the load is applied diagonally downward to the shock absorbing member when a pedestrian collides. It is explanatory drawing which shows the deformed state of the shock absorbing member when a pedestrian collides. It is explanatory drawing which shows the crushed state of the shock absorbing member when a pedestrian collides. It is explanatory drawing which shows the deformed state of the shock absorbing member when an obstacle on a road collides. It is sectional drawing of the bumper structure which shows the modification. It is explanatory drawing which shows the deformed state of the shock absorbing member when an obstacle on a road collides.

1 to 7 show an embodiment of the present invention, FIG. 1 is a schematic perspective view of the front part of an automobile vehicle showing an installed state of a sensor tube, and FIG. 2 is an explanatory view showing a positional relationship between a pedestrian and a bumper. FIG. 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 diagonally downward to the shock absorbing member when a pedestrian collides, and FIG. 5 is a shock absorbing view when a pedestrian collides. An explanatory view showing a deformed state of the member, FIG. 6 is an explanatory view showing a crushed state of the shock absorbing member when a pedestrian collides, and FIG. 7 is an explanatory view showing a deformed state of the shock absorbing member when a road obstacle collides. It is a figure. Note that FIG. 1 is shown by omitting the bumper face and the shock absorbing member for the sake of explanation.

This automobile vehicle has a vehicle body in which panel-shaped members obtained by press-molding metal plates such as iron and aluminum are assembled and joined by spot welding or the like. As shown in FIG. 1, an automobile vehicle has a bumper beam 10 extending 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 formed so as to be curved so that the central portion projects forward from each end portion in the vehicle width direction. As shown in FIG. 2, the bumper beam 10 is formed so that the cross section in the side view is a closed cross section.

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

As shown in FIG. 2, a shock absorbing member 30 is arranged between the bumper beam 10 and the bumper face 20. The shock absorbing member 30 is made of, for example, a 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 the knee of the leg of a pedestrian, assuming a general adult male.

As shown in FIG. 3, the rear end of the shock absorbing member 30 is 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. NS. The lower side of the shock absorbing member 30 is discontinuously formed on the front end side and the rear end side. Specifically, the shock absorbing member 30 has a notch 32 on the lower side, which discontinues the front end side and the rear end side. In the present embodiment, the lower surface 33 of the shock absorbing member 30 is formed substantially horizontally, and the notch portion 32 is formed in a rectangular shape.

As shown in FIG. 3, the sensor tube 40 is arranged between the shock absorbing member 30 and the bumper beam 10. As shown in FIG. 1, the sensor tube 40 is arranged 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. A pressure detection unit that detects a pressure change in the tube is connected to both ends of the sensor tube 40. 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 body with the bumper is a pedestrian, a road marker, a road obstacle such as a small animal, or the like.

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

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

According to the vehicle collision detection device configured as described above, when a pedestrian collides with the bumper, the vicinity of the pedestrian's leg comes into contact with the bumper in the vertical direction as shown in FIG. 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 diagonally downward from the upper end side of the front end. Then, as shown in FIG. 5, the shock absorbing member 30 is sequentially pressed and deformed from the upper front portion to the lower rear portion. At this time, the deformed shock absorbing member 30 presses the sensor tube 40, and it is detected that 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 even after this, and finally it is thinly crushed in the front-rear direction.

On the other hand, when a road obstacle such as a road marker or a small animal comes into contact with the bumper, a load is applied to the shock absorbing member 30 via the bumper face 20 from the lower end side of the front end diagonally upward. Then, as shown in FIG. 7, the shock absorbing member 30 is sequentially pressed and deformed from the lower front portion to the upper rear portion. Here, since the lower side of the shock absorbing member 30 is discontinuously formed between 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 formed. Deformation is suppressed. 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 body with the bumper is a pedestrian, a road marker, a road obstacle such as a small animal, or the like. Therefore, the pressure fluctuation in the sensor tube 40 can be suppressed without pushing down the obstacle on the road as in the conventionally known one.

Further, according to the vehicle collision determination device of the present embodiment, since the shock absorbing member 30 has a continuous forming portion 34 in which the shock absorbing member 30 is continuously formed from the front end to the rearmost end, sufficient energy absorption at the time of a collision is provided. 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 collision, an impact is generated. The absorbing member 30 enters a portion other than the continuous forming portion 34 and is deformed, and finally is thinly crushed in the front-rear direction. As a result, it is possible to reduce the input from the bumper side to the pedestrian.

Further, according to the vehicle collision detection device of the present embodiment, the vertical dimension of the front end of the shock absorbing member 30 is the same as or larger than the vertical dimension of the other portion in the side cross section. As a result, the area of the front end of the shock absorbing member 30 can be increased, and the amount of energy absorbed at the initial stage of collision can be increased.

If the lower side of the shock absorbing member 30 is discontinuously formed between 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 of the automobile vehicle, the required performance, and the like. For example, as shown in FIG. 8, a notch portion 132 may be formed on the lower side of the shock absorbing member 130 instead of the notch portion 32 of the embodiment. In the shock absorbing member 130, the lower surface 133 is inclined downward toward the rear, and the upper surface 135 is inclined upward toward the rear. Even with this shock absorbing member 130, as shown in FIG. 9, when an obstacle on the road comes into contact with 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 Deformation is suppressed.

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

10 Bumper beam 20 Bumper face 30 Shock absorbing member 31 Receptive part 32 Notch 33 Lower surface 34 Continuous forming part 35 Upper surface 40 Sensor tube 130 Shock absorbing member 132 Notch 133 Lower surface 135 Upper surface

Claims (5)

A bumper beam that extends in the width direction of the vehicle,
A bumper face that is placed in front of the bumper beam and extends in the vehicle width direction,
A shock absorbing member arranged between the bumper beam and the bumper face,
A sensor tube arranged between the shock absorbing member and the bumper beam is provided.
The lower side of the shock absorbing member is formed discontinuously on the front end side and the rear end side .
The portion of the lower side of the shock absorbing member that is discontinuously formed between the front end side and the rear end side is a vehicle collision detection device that is arranged in front of the sensor tube in the front-rear direction. The vehicle collision detection device according to claim 1, wherein the shock absorbing member has a notch on the lower side that discontinues the front end side and the rear end side. The vehicle collision detection device according to claim 1, wherein the shock absorbing member has a notch portion on the lower side that discontinues the front end side and the rear end side. Any one of claims 1 to 3, wherein the shock absorbing member has a continuously forming portion formed continuously from the front end to the rearmost end of the shock absorbing member at a position higher than the sensor tube and having a predetermined vertical dimension. The vehicle collision detection device according to item 1. The vehicle collision detection device according to any one of claims 1 to 4, wherein the shock absorbing member has a vertical dimension of a front end equal to or larger than that of another portion in a side cross section.

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