JP6867846B2 - 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 vertical direction of the vehicle, and has a protrusion in which the front surface in the front-rear direction of the vehicle projects from the general surface to the front side of the vehicle. 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 vehicle collision determination device capable of the above.

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 an absorbing member and a sensor tube arranged between the shock absorbing member and the bumper beam, and the shock absorbing member is formed so that the lower end height at the rear end is lower than the lower end height at the front end. A vehicle collision detection device is provided in which the tube is arranged at a position lower than the height of the lower end at the front end of the shock absorbing member.

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, the shock absorbing member is formed so that the lower end height at the rear end is lower than the lower end height at the front end, and the sensor tube is arranged at a position lower than the lower end height at the front end of the shock absorbing member. Therefore, even if the shock absorbing member is deformed from the lower front portion to the upper rear portion, 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 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 shock absorbing member may have a recess formed lower than the front on the rear end side of the upper portion.

According to this vehicle collision detection device, when an obstacle on the road comes into contact with the bumper and the shock absorbing member is sequentially pressed and deformed from the lower front part to the upper rear part, the shock absorbing member By bending the vicinity of the recess, it is possible to accurately control the deformation mode when an obstacle on the road collides.

Further, in the vehicle collision detection device, the shock absorbing member may have inclined surfaces extending diagonally downward toward the rear on the upper surface and the lower surface.

According to this vehicle collision detection device, the shock absorbing member extends obliquely upward from a fixed end with the rear bumper beam toward a front free end. Therefore, when a load is applied diagonally upward from the lower end side of the front end when colliding with an obstacle on the road, this load acts not a little in the shearing direction of the shock absorbing member, and the vicinity of the fixed end near the sensor tube is compared. It does not deform significantly, and the front end side, which is the free end, deforms relatively large diagonally upward. On the other hand, when a load is applied diagonally downward from the upper end side of the front end at the time of a collision with a pedestrian, this load mainly acts in the compression direction of the shock absorbing member and is compressed from the upper front side to the lower rear side. , The sensor tube is pressed.

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 the 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 state which the load is applied diagonally upward to the shock absorbing member when the road obstacle collides. It is explanatory drawing which shows the deformed state of the shock absorbing member when a road obstacle collides. It is sectional drawing of the bumper structure which shows the modification.

1 to 8 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. Explanatory drawing showing the deformed state of the member, FIG. 6 is an explanatory view showing the crushed state of the shock absorbing member when a pedestrian collides, and FIG. 7 is an explanatory view showing the shock absorbing member diagonally upward when an obstacle on the road collides. An explanatory view showing a state in which a load is applied, and FIG. 8 is an explanatory view showing a deformed state of the shock absorbing member when an obstacle on the road collides. 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, foamed resin, and can be, 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 shock absorbing member 30 is formed so that the lower end height RH at the rear end is lower than the lower end height FH at the front end. 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. That is, the sensor tube 40 is arranged at a position lower than the lower end height FH at the front end of the shock absorbing member 30 and higher than the lower end height RH at the rear end. In the present embodiment, the lower surface of the shock absorbing member 30 has a horizontal plane 32 extending substantially horizontally rearward from the front end and an inclined surface 33 extending diagonally downward from the rear end of the horizontal plane 32.

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, the shock absorbing member 30 has a recess 35 formed lower than the front on the rear end side of the upper portion. In the present embodiment, the upper surface of the shock absorbing member 30 has a front horizontal plane 36 extending substantially horizontally rearward from the front end, an inclined surface 37 extending diagonally downward from the rear end of the horizontal plane 36, and substantially horizontal from the rear end of the inclined surface 37. It has a rear horizontal plane 38 that extends horizontally rearward. The inclined surface 37 and the rear horizontal plane 38 define a recess 35 formed lower than the front horizontal plane 36. The inclined surface 37 on the upper surface of the shock absorbing member 30 is formed inside the forming section of the inclined surface 33 on the lower surface in the front-rear direction.

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 diagonally upward from the lower end side of the front end, as shown in FIG. .. Then, as shown in FIG. 8, the shock absorbing member 30 is sequentially pressed and deformed from the lower front portion to the upper rear portion. Here, the shock absorbing member 30 is formed so that the lower end height RH at the rear end is lower than the lower end height FH at the front end, and the sensor tube 40 is located at a position lower than the lower end height FH at the front end of the shock absorbing member 30. Have been placed. Therefore, even if the shock absorbing member 30 is deformed from the lower front portion to the upper rear portion, 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, and in particular, it is possible to reduce the load in the bending direction on the knee portion of the pedestrian.

Further, according to the vehicle collision detection device of the present embodiment, the shock absorbing member 30 has a recess 35 formed lower than the front on the rear end side of the upper part. As a result, as shown in FIG. 8, when an obstacle on the road comes into contact with the bumper and the shock absorbing member 30 is sequentially pressed and deformed from the lower front portion to the upper rear portion, the shock absorbing member is deformed. By bending the vicinity of the recess 35 of the 30th, it is possible to accurately control the deformation mode at the time of collision of an obstacle on the road.

In particular, according to the present embodiment, since the upper surface and the lower surface of the shock absorbing member 30 have inclined surfaces 33 and 37 descending rearward, respectively, the shock absorbing member 30 is approximately from the fixed end with the rear bumper beam 10. , Extends diagonally upward toward the front free end. Therefore, when a load is applied diagonally upward from the lower end side of the front end when colliding with an obstacle on the road, this load acts not a little in the shearing direction of the shock absorbing member 30 and is near the fixed end near the sensor tube 40. Does not deform relatively large, and the front end side, which is the free end, deforms relatively large diagonally upward. On the other hand, when a load is applied diagonally downward from the upper end side of the front end at the time of a collision with a pedestrian, this load mainly acts in the compression direction of the shock absorbing member 30 and compresses from the upper front portion to the lower rear portion. And the sensor tube 40 is pressed.

If the shock absorbing member 30 is formed so that the lower end height RH at the rear end is lower than the lower end height FH at the front end and the sensor tube 40 is arranged lower than the lower end height FH at the front end, the shape thereof is changed. It can be arbitrarily changed according to the specifications of the automobile vehicle, the required performance, and the like. For example, as shown in FIG. 9, the recess 35 of the shock absorbing member 30 can be omitted.

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 Receptor 32 Horizontal surface 33 Inclined surface 34 Continuous forming part 35 Recessed 36 Front horizontal surface 37 Inclined surface 38 Rear horizontal surface 40 Sensor tube FH Lower end height at front end RH Lower end height at rear end

Claims (4)

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 shock absorbing member is formed so that the height of the lower end at the rear end is lower than the height at the lower end at the front end.
The sensor tube is a vehicle collision detection device arranged at a position lower than the height of the lower end at the front end of the shock absorbing member. The vehicle according to claim 1, 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. Collision detection device. The vehicle collision detection device according to claim 1 or 2, wherein the shock absorbing member has a recess formed lower than the front on the rear end side of the upper portion. The vehicle collision detection device according to any one of claims 1 to 3, wherein the shock absorbing member has an inclined surface extending obliquely downward toward the rear on the upper surface and the lower surface.

Images