DE112016000665T5 - Vehicle collision detection device - Google Patents

Vehicle collision detection device Download PDF

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Publication number
DE112016000665T5
DE112016000665T5 DE112016000665.9T DE112016000665T DE112016000665T5 DE 112016000665 T5 DE112016000665 T5 DE 112016000665T5 DE 112016000665 T DE112016000665 T DE 112016000665T DE 112016000665 T5 DE112016000665 T5 DE 112016000665T5
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DE
Germany
Prior art keywords
vehicle
recess
length
detection tube
bumper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE112016000665.9T
Other languages
German (de)
Inventor
Takatoshi Tanabe
Daisuke Nakane
Tomokazu Yoshida
Yukihiro Saitoh
Kouta Amano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
Denso Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2015-023229 priority Critical
Priority to JP2015023229A priority patent/JP6432376B2/en
Application filed by Denso Corp filed Critical Denso Corp
Priority to PCT/JP2016/000555 priority patent/WO2016129251A1/en
Publication of DE112016000665T5 publication Critical patent/DE112016000665T5/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/48Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects combined with, or convertible into, other devices or objects, e.g. bumpers combined with road brushes, bumpers convertible into beds
    • B60R19/483Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects combined with, or convertible into, other devices or objects, e.g. bumpers combined with road brushes, bumpers convertible into beds with obstacle sensors of electric or electronic type
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0136Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to actual contact with an obstacle, e.g. to vehicle deformation, bumper displacement or bumper velocity relative to the vehicle
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • B60R2019/186Additional energy absorbing means supported on bumber beams, e.g. cellular structures or material

Abstract

A vehicle impact detecting device (1) comprises a bumper absorber (2) disposed on the vehicle front side of a bumper reinforcement (9) in a bumper (7) of a vehicle, a detection tube member (3) fixed to a recess portion (2c), formed on the bumper absorber (2) to extend in a vehicle width direction and including a hollow body (3a) therein, and a pressure sensor (4) detecting a pressure in the hollow body (3a) of the detection pipe member (3). The vehicle impact detecting device detects an impact of an object on the bumper (7) based on a pressure detection result by the pressure sensor (4). The detection tube member (3) is fixed to the recess portion (2c) in a state where at least a part of the detection tube member (3) is compressed in the vehicle width direction by a predetermined amount in a vehicle longitudinal direction.

Description

  • CROSS-REFERENCE TO RELATED APPLICATIONS
  • This application is based on the filed on February 9, 2015 Japanese Patent Application No. 2015-23229 ; the full disclosure is hereby incorporated by reference.
  • TECHNICAL AREA
  • The present invention relates to a vehicle impact detecting device for detecting a collision of a vehicle with a pedestrian or the like.
  • STATE OF THE ART
  • A vehicle has been provided with a pedestrian protection device to reduce the impact on a pedestrian as soon as the pedestrian impacts the vehicle. This vehicle is constructed such that the vehicle is provided with an impact detecting device including a sensor formed in a bumper part, and that in a case where detected by the sensor, the pedestrian or the like impacts the vehicle , the pedestrian protection device is activated, which reduces the impact on the pedestrian. The pedestrian protection device includes, for example, a part called a pop-up hood. The pop-up hood is a part which raises a rear end of a hood at the time of detecting a collision of the vehicle, thereby increasing a space (distance) between the pedestrian and a hard part such as a motor, thereby increasing a space Impact energy acting on a head portion of the pedestrian by using the space is absorbed to thereby reduce an impact on the head portion of the pedestrian.
  • The vehicle impact detecting apparatus described above includes a device constructed such that a chamber member having a chamber space formed therein is disposed on the front surface of a bumper reinforcement in a bumper of the vehicle, and pressure in the chamber space is detected by a pressure sensor. In the device thus constructed, when an object such as a pedestrian or the like bounces on a bumper (bumper fascia), the bumper fascia deforms and also deforms the chamber member, thereby causing a pressure change in the chamber space. Subsequently, the vehicle impact detecting device detects the pressure change by the pressure sensor to thereby detect a collision of the pedestrian or the like with the bumper fascia.
  • In recent years, a pipe type vehicle impact detecting apparatus has been proposed which detects an impact using a pipe member and which is smaller in size and much easier to fit than a chamber type vehicle impact detecting apparatus. The tube type vehicle impact detecting device is constructed of: a bumper absorber disposed in a bumper of the vehicle; a hollow tube member fitted in a recess portion formed in the rear surface of the bumper absorber along a vehicle width direction; and a pressure sensor for detecting pressure in the pipe element. Subsequently, when a pedestrian or the like bounces on a front portion of the vehicle, during the absorption of a shock, the bumper absorber is deformed along with the deformation of the bumper fascia, and at the same time, the tubular member is also deformed. At this time, the pressure in the pipe member is increased and the vehicle impact detecting device detects a pressure change in the pipe member by the pressure sensor to thereby detect a collision of the vehicle with the pedestrian or the like.
  • LITERATURE TO THE PRIOR ART
  • Patent Literature
    • Patent Literature 1: JP2014-505629A
  • Meanwhile, in the vehicle impact detecting apparatus of the above-described configuration, when the vehicle bounces on the pedestrian or the like at a position where a length (thickness) in a vehicle longitudinal direction of the bumper absorber is long (thick), there is a case in which takes until the detection tube element is deformed along with the deformation of the bumper absorber. This poses a problem that, even in this case, the vehicle impact detecting apparatus must promptly detect the impact and activate a pedestrian protection apparatus at an appropriate time
  • SUMMARY OF THE INVENTION
  • The present invention addresses the above topics. It is thus an object of the present invention to provide a tube type vehicle impact detecting apparatus in which an increase of an output of a pressure sensor at the time of impact is accelerated.
  • To achieve the object, a vehicle impact detecting apparatus in a first aspect of the present invention includes a bumper absorber disposed on a vehicle front side of a bumper reinforcement in a bumper of a vehicle, a detection tube member fitted to a recess portion formed on the bumper absorber is to extend in a vehicle width direction, and has therein a hollow body, and a pressure sensor, which detects a pressure in the hollow body of the detection tube member. The vehicle impact detecting device detects an impact of an object on the bumper based on a pressure detection result by the pressure sensor. The detection tube member is fixed to the recess portion in a state in which at least a part of the detection tube member is compressed in the vehicle width direction by a predetermined amount in a vehicle longitudinal direction.
  • According to this construction, the detection tube member in the recess portion is fitted in a state in which at least a portion of the detection tube member has been compressed in the vehicle width direction by a predetermined amount in the vehicle front-end direction, thereby accelerating an increase in the output of the pressure sensor in at least a portion of the detection tube member can. In this way, an impact detection accuracy of the vehicle impact detecting device can be improved.
  • In order to achieve the object, a vehicle impact detecting apparatus in a second aspect of the present invention includes a bumper absorber disposed on the vehicle front side of a bumper reinforcement a bumper of a vehicle, a detection tube member fixed to a recess portion formed on the bumper absorber is to extend in a vehicle width direction, and has therein a hollow body, and a pressure sensor, which detects a pressure in the hollow body of the detection tube member. The vehicle impact detecting device detects an impact of an object on the bumper based on a pressure detection result by the pressure sensor. The recess portion has a length in the vehicle longitudinal direction which is different depending on the position in the vehicle width direction. In the vehicle width direction, at least a portion of the recess portion has a length in the vehicle longitudinal direction which is smaller than a length of the detection tube member in the vehicle longitudinal direction.
  • According to this construction, by making the length of the recess portion in the vehicle longitudinal direction at least the portion of the recess portion in the vehicle width direction smaller than the length of the detection tube member in the vehicle longitudinal direction, the detection tube member fitted in the portion can be brought into a state in which the detection tube member was previously compressed by the predetermined amount in the vehicle longitudinal direction. In this way, an increase in the output of the pressure sensor can be accelerated and thus the impact detection accuracy of the vehicle impact detecting device can be improved.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The above and other aspects, features, and advantages of the present invention will become more apparent from the following detailed description made with reference to the accompanying drawings. Show it:
  • 1 a figure to illustrate a general structure of a vehicle impact detection device of a first embodiment;
  • 2 an enlarged view of an in 1 shown bumper part;
  • 3 a cross-sectional view taken along a line III-III in 2 ;
  • 4 a cross-sectional view taken along a line IV-IV in 2 ;
  • 5 an enlarged cross-sectional view of an in 4 shown recess section;
  • 6 a diagram to show a relationship between a length of a recess portion in a vehicle longitudinal direction and an output of a pressure sensor in the first embodiment;
  • 7 a diagram to illustrate the output of a pressure sensor at the time of impact on a central portion region in a vehicle width direction of the bumper of the first embodiment;
  • 8th a view according to 2 in a second embodiment;
  • 9 a cross-sectional view taken along a line IX-IX in 8th ;
  • 10 a cross-sectional view along a line XX in 8th ;
  • 11 a view according to 2 in a third embodiment;
  • 12 a cross-sectional view taken along a line XII-XII in 11 ;
  • 13 a cross-sectional view taken along a line XIII-XIII in 11 ;
  • 14 a view according to 12 to illustrate an arrangement structure of a pressing member in a fourth embodiment; and
  • 15 a view to illustrate a modification of the arrangement structure of the pressing member.
  • EMBODIMENTS FOR CARRYING OUT THE INVENTION
  • First Embodiment
  • Hereinafter, a vehicle impact detecting device of a first embodiment with reference to 1 to 7 described. As in the 1 and 2 is a vehicle crash detection device 1 the present embodiment of a bumper absorber 2 a detection tube element 3 , a pressure sensor 4 , a speed sensor 5 , an impact detection ECU 6 , a bumper reinforcement 9 and the like. The vehicle impact detection device 1 detects an impact of an object such as a pedestrian on a bumper 7 , which is formed in a front portion of a vehicle. The bumper 7 exists, as in 3 shown, mainly from a bumper fascia 8th , the bumper absorber 2 and the bumper reinforcement 9 ,
  • The bumper absorber 2 consists of a front surface 2a , which is an area on a vehicle front side, and a rear surface 2 B , which is an area on a vehicle rear side, and is at a position opposite to a front surface 9a the bumper reinforcement 9 arranged. The bumper absorber 2 is an element with a function of absorbing an impact in the bumper 7 and is made of foamed polypropylene, for example.
  • Further, a length (thickness) A of the bumper absorber 2 in a vehicle longitudinal direction at a position in a vehicle width direction different (see 2 ). In particular, a length A1 of the bumper absorber 2 in the vehicle longitudinal direction at the central portion area (middle area) in the vehicle width direction, as in FIG 3 shown larger (thicker) than a length A2 of the bumper absorber 2 in the vehicle longitudinal direction at an end portion area (corner area) in the vehicle width direction, as in FIG 4 shown. The length A1 is for example about 65 mm, while the length A2 is about 30 mm.
  • In the back area 2 B of the bumper absorber 2 , as in 3 and 4 shown is a recess section 2c formed in which the detection tube element 3 is fitted. The recess section 2c has a rectangular cross section and is formed along the vehicle width direction. The recess section 2c has an open area 2d , which is formed on the vehicle rear side, and has in it from the open area 2d here fitted detection tube element 3 on. In this regard, the rear surface is adjacent 2 B of the bumper absorber 2 to the front surface 9a the bumper reinforcement 9 at. In addition, the bumper absorber 2 and the bumper reinforcement 9 with fitting portions (not shown in the drawings) fitted and fixed to each other or formed in them.
  • A length L of the recess portion 2c in the vehicle longitudinal direction is different at a position in the vehicle width direction and according to the length A (thickness) of the bumper absorber 2 determined in the vehicle longitudinal direction (see 2 ). In other words, the recess section 2c is formed so that at the position in the vehicle width direction, at which the length A of the bumper absorber 2 is greater in the vehicle longitudinal direction, the length L of the recess portion 2c is smaller in the vehicle longitudinal direction. In this case, a length L1 of the recess portion 2c in the vehicle longitudinal direction at the central portion portion (middle portion) in the vehicle width direction, shown in FIG 3 smaller than a length L2 of the recess portion 2c at the end portion portion (corner portion) in the vehicle longitudinal direction shown in FIG 4 , In this regard, the length A of the bumper absorber means 2 in the vehicle longitudinal direction, a length of the bumper absorber to the open area 2d the recess section 2c in the vehicle longitudinal direction.
  • In particular, the length L1 of the recess portion 2c in the vehicle longitudinal direction at the central portion portion (middle portion) in the vehicle width direction, shown in FIG 3 to set a certain length smaller than a length (outer diameter D) of the detection tube member 3 in the vehicle longitudinal direction. The outer diameter D is a length in a state in which the detection tube element 3 not yet in the recess section 2c is fitted. In particular, the outer diameter D of the detection tube element 3 the present embodiment about 8 mm, while the length L1 of the recess portion 2c in the Vehicle longitudinal direction in the middle section is about 7 mm. In other words, the length L1 of the recess portion 2c in the vehicle longitudinal direction is smaller in the central portion by about 1 mm than the outer diameter D of the detection tube element 3 , Thus, the detection tube element 3 at the central portion portion in the vehicle width direction in the recess portion 2c fitted in a state in which the detection tube element 3 is compressed in the vehicle longitudinal direction by about 1 mm.
  • On the other hand, one is, in 4 shown, length L2 of the recess portion 2c in the vehicle longitudinal direction at the end portion portion (corner portion) in the vehicle width direction, to almost the same length as the length (outer diameter D) of the detection tube member 3 set in the vehicle longitudinal direction. In this way, in the present embodiment, the length L1 of the recess portion 2c in the vehicle longitudinal direction at the central portion portion (middle portion) in the vehicle width direction, at which the length A of the bumper absorber 2 larger in the vehicle longitudinal direction, smaller than the length of the detection tube member 3 set in the vehicle longitudinal direction, while the length L2 of the recess portion 2c in the vehicle longitudinal direction at the end portion portion (corner portion), which is other than the middle portion, to the same length as the length of the detection tube member 3 is set in the vehicle longitudinal direction. Furthermore, as in 5 shown, a length H of the recess portion 2c in the vehicle height direction is greater than a length (outer diameter D) of the detection tube member 3 set in the vehicle height direction.
  • The detection tube element 3 , as in 1 and 2 is shown a tubular member in which a hollow body 3a is formed and which extends in the vehicle width direction (vehicle left-right direction) and in the recess portion 2c of the bumper absorber 2 is fitted. The detection tube element 3 is at a position opposite the front surface 9a (Vehicle front) of the bumper reinforcement 9 in the bumper 7 of the vehicle. Both end portions of the detection tube element 3 are on the left and right outside of the bumper reinforcement 9 each curved almost in the shape of a letter C and to the pressure sensors 4 coupled, which will be described later. In this regard, at the central portion portion (middle portion) in the vehicle width direction as described above, the length L1 of the recess portion is 2c in the vehicle longitudinal direction smaller than the outer diameter D of the detection tube element 3 (L1 <D), so that the detection tube element 3 in the recess section 2c is arranged in a state in which the detection tube element 3 is compressed in the vehicle longitudinal direction by a certain amount (in this case about 1 mm).
  • The detection tube element 3 has a circular cross-sectional shape and is made of synthetic rubber, for example, silicone rubber. As in 5 the outer diameter D of the detection tube element is shown 3 for example about 8 mm. An inner diameter d of the detection tube element 3 is for example about 4 mm. Further, a thickness t of a peripheral wall of the detection tube member 3 for example about 2 mm. In this regard, a cross-sectional shape of the detection tube element 3 not limited to a circle, but may be a polygonal shape, such as a square. Further, in addition to the silicone rubber, ethylene-polypropylene rubber (EPDM) as the material for the detection tube member may also be used 3 be used.
  • The pressure sensor 4 is closer to the vehicle rear than to the front surface 9a the reinforcement 9 arranged. In particular, the pressure sensors 4 at two, the left and right end portion areas in the bumper fascia 7 arranged and on the rear surface 9b the reinforcement attached with screws or the like (not shown in the drawing), making them firmly on the rear surface 9b are attached. In the present embodiment, there are two pressure sensors 4 arranged in this way, whereby redundancy and impact detection accuracy can be ensured.
  • The pressure sensors 4 are, as in 2 shown constructed in such a way as to engage both the left and right end portion portions of the detection tube member 3 coupled and the pressure in the hollow body 3a of the detection tube element 3 capture. In particular, each of the pressure sensors 4 a sensor device for detecting a pressure change of gas and each detects a pressure change of air in the hollow body 3a of the detection tube element 3 , Each of the pressure sensors 4 is how in 1 shown electrically with the impact detection ECU (Electric Control Unit) 6 Connected via a transmission line and outputs a signal proportional to the pressure to the impact detection ECU 6 out. The impact detection ECU 6 detects a collision of a pedestrian with the bumper 7 on the basis of a pressure detection result by the pressure sensor 4 , In addition, the impact detection ECU is 6 electrically with a pedestrian protection device 10 connected.
  • The speed sensor 5 is a sensor device for detecting a speed of the vehicle and is electrically connected to the impact detecting ECU through a signal line 6 connected. The speed sensor 5 sends a signal proportional to a vehicle speed to the impact detection ECU 6 ,
  • The impact detection ECU 6 mainly consists of a CPU and controls a complete operation of the vehicle impact detection device 1 and is electrically connected respectively to the pressure sensors 4 , the speed sensor 5 and the pedestrian protection device 10 connected (see 1 ). A pressure signal (pressure data) from the pressure sensors 4 and a speed signal (speed data) from the speed sensor 5 be in the impact detection ECU 6 entered. The impact detection ECU 6 performs a certain impact determination processing based on the pressure detection result by the pressure sensors 4 (Input signal) and a speed detection result by the speed sensor 5 (Input signal), and in a case where the impact detection ECU 6 an impact of an object, a pedestrian or the like with the bumper 7 detects, activates the impact detection ECU 6 the pedestrian protection device 10 ,
  • The bumper 7 dampens an impact when the vehicle hits an object and consists of the bumper trim 8th , the bumper absorber 2 , the bumper reinforcement 9 and the same. The bumper fascia is an element which is arranged in a manner to components of the bumper 7 Cover and which consists of resin, such as polypropylene or the like. The bumper panel 8th designed an external appearance of the bumper 7 and at the same time forms part of the external appearance of the entire vehicle.
  • The bumper reinforcement 9 is a rigid element used in the bumper fascia 9 is arranged, extends in the vehicle width direction, made of metal, such as aluminum, and as in 3 and 4 is shown, a hollow body having a beam which is arranged in a center of an inner space. In addition, the bumper reinforcement has 9 the front surface 9a , which is an area on the vehicle front, and a rear surface 9b , which is an area on the vehicle rear side, on. The bumper reinforcement 9 is how it is in 1 and 2 is shown at the front end of the two side elements 11 fastened, which consist of metal and extend in the vehicle longitudinal direction.
  • In a collision accident of the vehicle, there are many cases in which the vehicle bounces on a pedestrian or other vehicle which exist in a traveling direction of the vehicle (ie, in front of the vehicle). For this reason, in the present embodiment, the pressure sensors 4 on the back surface 9b the bumper reinforcement 9 arranged to cause an impact, which is caused by a collision of the vehicle with the pedestrian or the other vehicle in front of the vehicle, before the direct transmission of the bumper fascia 8th and the like, which are arranged in front of the vehicle, to the pressure sensors by the existence of the bumper reinforcement 9 to protect.
  • As the pedestrian protection device 10 a pop-up hood can be used. In a pop-up hood, after a collision of the vehicle is detected, a rear end of a hood is directly raised, thereby increasing a space (gap) between the pedestrian and a hard part such as a motor, thereby an impact energy acting on a head portion of the pedestrian by using the space is absorbed to thereby reduce the impact on the head portion of the pedestrian. Instead of the pop-up hood, the use of a hood airbag or the like, which expands an airbag from above a hood of the outside of a vehicle body to below a windshield, thereby buffering the impact on the pedestrian is also recommended.
  • Next, an action performed by the vehicle impact detecting device 1 in the present embodiment, at the time of impact. When a collision of the vehicle with a pedestrian or the like is caused, the bumper fascia becomes 8th of the bumper 7 to the vehicle rear side by a shock (external force) caused by the impact with the pedestrian or the like. As a result, when the bumper absorber 2 along with the deformation of the bumper fascia 7 is deformed while absorbing the shock at the same time the detection tube element 3 deformed in such a way that it is compressed in the vehicle longitudinal direction. At this time, the pressure in the hollow body 3a of the detection tube element 3 increases rapidly and this pressure change is sent to the pressure sensors 4 transfer.
  • Specifically, in the present embodiment, as described above, at the central portion portion (middle portion) in the vehicle width direction, the length L1 of the recess portion is 2c in the vehicle longitudinal direction smaller than the outer diameter D of the detection tube element 3 (L1 <D), so that the detection tube element 3 in the recess section 2c is arranged in a state in which the detection tube element 3 is compressed in the vehicle longitudinal direction by a certain amount (see 2 and 3 ). In particular, the outer diameter D of the detection tube element 3 of the present embodiment, about 8mm, while the length L1 of the recess portion 2c in the vehicle longitudinal direction in the middle section is about 7 mm. In other words, the length L1 of the recess section 2c in the vehicle longitudinal direction in the central portion is smaller than the outer diameter D of the detection tube member by about 1 mm 3 , Thus, the detection tube element 3 at the central portion portion in the vehicle width direction in a state in the recess portion 2c fitted, in which the detection tube element 3 is compressed in the vehicle longitudinal direction by about 1 mm.
  • In this way, in the present embodiment, the detection tube element 3 in the state in the recess portion 2c fitted, in which the detection tube element 3 is compressed in the vehicle longitudinal direction by a certain amount, whereby, as in 6 and 7 shown an output of the pressure sensor 4 is increased for an external force of a certain size. In other words, in comparison with a case where the length L (L2 = 8 mm) of the recess portion 2c in the vehicle longitudinal direction almost equal to the length (outer diameter D = 8 mm) of the detection tube element 3 in the vehicle longitudinal direction is in a case where the length L (L1 = 7 mm) of the recess portion 2c is made smaller in the vehicle longitudinal direction than the length (outer diameter D = 8 mm) of the detection tube element 3 in the vehicle longitudinal direction, the output of the pressure sensor 4 enlarged (see 6 ). In this way, compared to the output of the pressure sensor 4 at the time of impact in a case where L ≥ D indicated by a broken line in FIG 7 is shown, the output of the pressure sensor 4 at the time of impact in a case where L <D, which is indicated by a solid line in FIG 7 is shown, an accelerated increase of the pressure detection value of the pressure sensor 4 on.
  • Here, "a pressure sensing area" is determined by the pressure sensor 4 can be detected. As described above, when the bumper fascia 7 deformed at the time of impact, the bumper absorber 2 deformed in the vehicle longitudinal direction and at the same time becomes the detection tube element 3 deformed in such a way that it is compressed in the vehicle longitudinal direction. The deformation of the detection tube element 3 continues until the inner wall surfaces on the vehicle longitudinal side of the detection tube element 3 be brought into contact with each other. When the inner wall surfaces of the detection tube element 3 in the vehicle longitudinal direction are brought into a contact state (fully compressed state), even if the bumper absorber 2 is further deformed, the detection tube element 3 are difficult to be further deformed in the vehicle longitudinal direction, so that the output of a pressure detected by the pressure sensor has been brought to a saturated state. In this way, there is an amount of deformation of the bumper absorber 2 caused by the deformation of the detection tube element 3 can be detected limited and a range of the amount of deformation of the bumper absorber 2 is referred to as "a pressure sensing area".
  • "The pressure sensing area" varies according to the length A of the bumper absorber 2 in the vehicle longitudinal direction before the impact and the length (outer diameter D) of the detection tube element 3 in the vehicle longitudinal direction. In other words, at the central portion portion in the vehicle width direction, in which the length A (thickness) of the bumper absorber 2 is long (thick) in the vehicle longitudinal direction, as compared with the end portion region in the vehicle width direction, in which the length A (thickness) of the bumper absorber 2 in the vehicle longitudinal direction is short (thin), the time that elapses until the detection tube element 3 is increased to the full contact state, so that "the pressure detection area" is increased.
  • On the other hand, it is known that "the pressure sensing area" of the hollow sensing tube element 3 itself by a term of (inner diameter d ÷ outer diameter D × 100) is calculated. In a case where the outer dimensions of the detection tube element 3 , Outside diameter D = 8 mm and inner diameter d = 4 mm, the pressure detection range of the detection tube element 3 4/8 x 100 = 50%. In the present embodiment, the detection tube element is 3 at the central portion portion in the vehicle width direction in the recess portion 2c fitted in a state in which the detection tube element 3 is compressed in the vehicle longitudinal direction by about 1 mm. The pressure detection area of the detection tube element 3 itself becomes (4 - 1) / (8 - 1) × 100 ≅ 43% in this section. In other words, when the detection tube element 3 in the recess section 2c is fitted in a state in which the detection tube element 3 in the vehicle longitudinal direction is compressed by a certain amount, the pressure sensing range of the detection tube element 3 reduced.
  • In the present embodiment, at the central portion portion (middle portion) in the vehicle width direction, in which the length is A1 (thickness) of the bumper absorber 2 long (thick) in the vehicle longitudinal direction, the length L1 of the recess portion 2c in the Vehicle longitudinal direction smaller than the length (outer diameter D) of the detection tube element 3 in the vehicle longitudinal direction, whereby the pressure sensing range of the detection tube element 3 itself is downsized. On the other hand, at the end portion portion (corner portion) or the like in the vehicle width direction, at which the length A2 (thickness) of the bumper absorber is 2 in the vehicle longitudinal direction is short (thin), the length L2 of the recess portion 2c in the vehicle longitudinal direction almost equal to the length of the detection tube element 3 in the vehicle longitudinal direction, whereby the pressure sensing range of the detection tube element 3 even to the maximum is secured. In this way, a change in "the pressure detection area" by the pressure sensor 4 reduced in size at a portion in the vehicle width direction.
  • Subsequently, the impact detection ECU performs 6 the vehicle impact detection device 1 a predetermined impact determination processing based on detection results of the pressure sensor 4 and the speed sensor 5 out. In the impact determination processing, for example, an effective mass of an impact object based on the detection results of the pressure sensor becomes 4 and the speed sensor 5 and, in the case where the effective mass is greater than a predetermined threshold, it is determined that a collision with a pedestrian has been caused. Further, in a case where a vehicle speed is in a certain range (for example, a range of 25 km / h to 55 km / h), it is determined that an impact is required for activation of a pedestrian protection device 10 was caused.
  • Here, "effective mass" means the mass obtained by using a relationship between moment and momentum by the detection value of the pressure sensor 4 calculated at the time of impact. In a case where the impact of the vehicle with the object is caused by the pressure sensor 4 detected pressure value between the pedestrian and an impact object, which is different in mass from the pedestrian, different. For this reason, by setting a threshold between the effective mass of a human body and the mass of an impact object other than that of the human body, the kind of the impact object can be discriminated. This effective mass, as shown in the following expression, can be divided by dividing a defined integral value of the pressure value detected by the pressure sensor in a certain period of time by the speed sensor 5 detected, vehicle speed are calculated. M = (∫P (t) dt) / V (expression 1)
  • In Expression 1, M denotes an effective mass, P denotes a value of that from the pressure sensor 4 t denotes a predetermined period of time (for example, several milliseconds to a few tens of milliseconds), and V denotes a vehicle speed at the time of impact caused by the speed sensor 5 is detected. As a method of calculating an effective mass, an effective mass can be calculated by using an expression to express a kinetic energy of an impact object which is E = 1/2 × MV 2 . In this case, the effective mass is calculated by an expression of M = 2 * E / V 2 .
  • Subsequently, in a case where the impact detection ECU 6 determines that the impact between the vehicle and the pedestrian, which is an activation of the pedestrian protection device 10 required, caused the impact detection ECU 6 a control signal for activating the pedestrian protection device 10 to thereby protect the pedestrian protection device 10 to activate, thereby reducing an impact on the pedestrian, as described above.
  • As described above, the vehicle impact detecting device includes 1 the first embodiment: the bumper absorber 2 , which is on the vehicle front of the bumper reinforcement 9 in the bumper 7 the vehicle is arranged; the detection tube element 3 which is in the recess section 2c is fitted in the bumper absorber 2 is formed in such a manner as to extend in the vehicle width direction, and in which a hollow body 3a is formed; and the pressure sensor 4 which the pressure in the hollow body 3a of the detection tube element 3 detected and the impact of the object (the pedestrian or the like) with the bumper 7 based on the pressure sensor 4 recorded pressure detection result. Then, the vehicle impact detecting device 1 the first embodiment, characterized in that the detection tube element 3 in the recess section 2c is fitted in a state in which at least a portion in the vehicle width direction (in this case: the central portion portion in the vehicle width direction) is compressed in the vehicle longitudinal direction by the predetermined amount.
  • According to this construction, the detection tube element 3 in the recess section 2c in the state where at least a portion in the vehicle width direction (in this case, the vehicle width direction central portion portion) is compressed in the vehicle longitudinal direction by a predetermined amount, thereby increasing the output of the pressure sensor 4 in at least a portion of the detection tube element 3 can be accelerated. In this way, an impact detection accuracy of the vehicle impact detecting device 1 be improved.
  • Further, the vehicle impact detecting device is 1 the first embodiment, characterized in that the length L of the recess portion 2c is different in the vehicle longitudinal direction according to a range in the vehicle width direction and that the length L1 in the vehicle longitudinal direction in at least a portion in the vehicle width direction (in this case: the central portion portion in the vehicle width direction) of the recess portion 2c smaller than the length (outer diameter D) in the vehicle longitudinal direction of the detection tube member 3 is.
  • According to this construction, the length L1 in the vehicle longitudinal direction is in at least a portion in the vehicle width direction of the recess portion 2c smaller than the length (outer diameter D) in the vehicle width direction of the detection tube member 3 , whereby the detection tube element fitted in this section 3 can be brought into a state in which the detection tube element 3 was previously compressed in the vehicle longitudinal direction by the predetermined amount. In this way, an increase in the output of the pressure sensor 4 be accelerated in this section.
  • Further, the length A of the bumper absorber 2 in the vehicle longitudinal direction according to a portion in the vehicle width direction different and the length L of the recess portion 2c in the vehicle longitudinal direction becomes according to the length A of the bumper absorber 2 set in the vehicle longitudinal direction. In this case, the recess section 2c formed so that at the portion in the vehicle width direction, in which the length A of the bumper absorber 2 is greater in the vehicle longitudinal direction, the length L of the recess portion 2c is smaller in the vehicle longitudinal direction. In particular, the vehicle impact detection device 1 the first embodiment, characterized in that the length L1 of the recess portion 2c in the vehicle longitudinal direction at the central portion portion in the vehicle width direction is smaller than the length (outer diameter D) of the detection tube member 3 in the vehicle longitudinal direction.
  • According to this construction, by setting the length L of the recess portion 2c in the vehicle longitudinal direction suitably according to the length A of the bumper absorber 2 in the vehicle longitudinal direction, the output of the pressure sensor 4 are generated sufficiently along the vehicle width direction. In other words, at the position in the vehicle width direction at which the length A (thickness) of the bumper absorber 2 in the vehicle longitudinal direction is long (thick), the length L1 of the recess portion 2c in the vehicle longitudinal direction smaller than the length (outer diameter D) in the vehicle longitudinal direction of the detection tube member 3 , whereby the output of the pressure sensor 4 can be increased at the time of impact. In this way, a change in the pressure detection range by the pressure sensor 4 be reduced at the position in the vehicle width direction.
  • Furthermore, the vehicle impact detection device 1 the first embodiment, characterized in that the recess portion 2c on the back surface 2 B of the bumper absorber 2 is formed and that the rear surface 2 B of the bumper absorber 2 to the front surface 9a the bumper reinforcement 9 borders. According to this construction, the rear surface is adjacent 2 B of the bumper absorber 2 to the front surface 9a the bumper reinforcement 9 so that a shock (external force) caused by the impact of the vehicle with the pedestrian or the like is certainly from the bumper reinforcement 9 the rigid element can be accommodated. In this way it is possible, the detection tube element 3 safely prevent it from being deflected in the vehicle's longitudinal direction, thus correctly detecting the impact. Further, it is possible for the detection tube element 3 to prevent it from the recess section 2c fall out and therefore the detection tube element 3 firmly in the recess section 2c to arrange.
  • Second Embodiment
  • Next, a second embodiment will be described with reference to FIGS 8th to 10 described. In this regard, the same parts as in the first embodiment in the 8th to 10 are denoted by the same reference numerals and their descriptions omitted, and only different parts thereof will be described. The second embodiment is different from the first embodiment as shown in FIGS 8th to 10 is shown in that the recess portion 2c in which the detection tube element 3 is fitted, in a central region in the vehicle longitudinal direction in the bumper absorber 2 is arranged.
  • Furthermore, the length L of the recess portion becomes 2c in the vehicle longitudinal direction according to a length A 'in the vehicle longitudinal direction from the front surface 2a of the bumper absorber 2 to the inner wall surface in the recess portion 2c on the back of the vehicle (see 8th ). In other words: At the position in the Vehicle width direction at which the length A 'of the bumper absorber 2 is greater in the vehicle longitudinal direction, the length L of the recess portion 2c smaller in the vehicle longitudinal direction.
  • In particular, applies to the length A 'in the vehicle longitudinal direction of the bumper absorber 2 in that a length A'1 in the vehicle longitudinal direction of the bumper absorber 2 at the central portion portion (middle portion) in the vehicle width direction shown in FIG 9 is larger (thicker) than a length A'2 in the vehicle front-rear direction of the bumper absorber 2 at the end portion area (corner portion) in the vehicle width direction shown in FIG 10 , For this reason, the length L1 of the recess portion becomes 2c in the vehicle longitudinal direction at the central portion portion in the vehicle width direction (middle portion) by a certain length (in this case: about 1 mm) set smaller than the length (diameter D) of the detection tube member 3 in the vehicle longitudinal direction. Further, the length L2 of the recess portion becomes 2c in the vehicle longitudinal direction at the end portion portion in the vehicle width direction (corner portion) is almost equal to the length of the detection tube member 3 set in the vehicle longitudinal direction. In this regard, the outer diameter D is a length L of the detection tube member 3 in the vehicle longitudinal direction in a state in which the detection tube element 3 not yet in the recess section 2c is fitted.
  • Similar to the first embodiment, the outer diameter D of the detection tube member 3 about 8 mm. In addition, the length L1 of the recess portion is 2c in the vehicle longitudinal direction in the middle section about 7 mm. Furthermore, the length L2 of the recess portion 2c in the vehicle longitudinal direction in the corner portion or the like, except in the central portion, still about 7 mm. Thus, the detection tube element 3 at the central portion portion in the vehicle width direction in the recess portion 2c fitted in a state in which the detection tube element 3 is compressed in the vehicle longitudinal direction by about 1 mm.
  • In this regard, with respect to a method of forming the recess portion 2c whose length is different in the vehicle longitudinal direction in the vehicle width direction, in the bumper absorber 2 for example, the recess section 2c produced by bonding and fixing two bumper absorbers, which are divided in the vehicle longitudinal direction. In this case, the recess section 2c , whose length is different in the vehicle longitudinal direction in the vehicle width direction, formed on the rear surface of a bumper absorber and has the detection tube member 3 fitted therein, and then has a front surface of the other bumper absorber glued to the rear surface thereof, whereby the bumper absorber 2 of the present embodiment is formed. It is also recommended to use the bumper absorber 2 of the present embodiment, by making a through-hole whose length is different in the vehicle longitudinal direction in the vehicle width direction, in a bumper absorber.
  • Also, in this second embodiment, the same effect as in the first embodiment can be produced. In other words, by fitting the detection tube element 3 in the recess section 2c in a state in which at least a portion in the vehicle width direction (in this case, the central portion region in the vehicle width direction) of the detection tube member 3 in the vehicle longitudinal direction has been compressed by a certain amount, an increase in the output of the pressure sensor 4 at the central portion portion in the vehicle width direction of the detection tube member 3 be accelerated. In this way, an impact detection accuracy of the vehicle impact detecting device 1 be improved.
  • Further, by forming the length L1 in the vehicle longitudinal direction at the central portion portion in the vehicle width direction of the recess portion 2c smaller than the length (outer diameter D) in the vehicle longitudinal direction of the detection tube member 3 that in the recess section 2c At the central portion portion in the vehicle width direction fitted detection tube element 3 be brought into a state in which the detection tube element 3 previously compressed in the vehicle longitudinal direction by the predetermined amount.
  • Further, by setting the length L in the vehicle longitudinal direction of the recess portion 2c suitably according to the length A 'in the vehicle longitudinal direction from the front surface 2a of the bumper absorber 2 to the inner wall surface on the vehicle rear side in the recess section 2c , the output of the pressure sensor 4 are generated along the vehicle width direction. In other words, by forming the length L1 in the vehicle longitudinal direction of the recess portion 2c smaller than the length (diameter D) in the vehicle longitudinal direction of the detection tube member 3 at a portion in the vehicle width direction, in which the length A 'in the vehicle longitudinal direction of the bumper absorber 2 long (thick), the output of the pressure sensor can 4 be enlarged at the time of impact.
  • Third Embodiment
  • Next, a third embodiment will be described with reference to FIGS 11 to 13 described. In this regard, the same parts as in the first embodiment in the 11 to 13 are denoted by the same reference numerals and their descriptions omitted, and only different parts thereof will be described. In the third embodiment, as in the 11 to 13 is shown, is a pressing element 12 for pressing the detection tube element 3 from the vehicle rear side to the vehicle front side on the vehicle front side of the bumper reinforcement 9 arranged.
  • In addition, the third embodiment is different from the first embodiment in that the length L of the recess portion 2c in the vehicle longitudinal direction along the vehicle width direction has the same length. In other words, a length L1 of the recess portion 2c in the vehicle longitudinal direction at the central portion portion (middle portion) in the vehicle width direction, shown in FIG 12 has the same length as a length L2 of the recess portion 2c in the vehicle longitudinal direction at the end portion region (corner portion) in the vehicle width direction shown in FIG 13 , In this case, the lengths L1 and L2 of the recess portion 2c in the vehicle longitudinal direction to the almost same length as the length (outer diameter D) of the detection tube element 3 in the vehicle longitudinal direction.
  • The pressing element 12 is an element shaped like a rectangular plate and made of a front surface 12a , an area on the vehicle front, and a rear surface 12b , an area on the vehicle rear side, is constructed. The pressing member is along the vehicle width direction, between the rear surface 2 B of the bumper absorber 2 and the front surface 9a the bumper reinforcement 9 arranged.
  • The pressing element 12 is made of a harder material than the bumper absorber 2 For example, foamed resin having a lower expansion ratio than the bumper absorber 2 , The detection tube element 3 is in the recess section 2c of the bumper absorber 2 fitted and then the pressing element 12 on the back surface 2 B of the bumper absorber 2 arranged. The bumper absorber 2 and the pressing element 12 For example, they are glued and fastened together. Furthermore, the pressing element 12 and the bumper reinforcement 9 fitted and attached to each other or formed in them by fitting portions (not in the drawing). In this regard, as the material of the pressing element 12 in addition to the foamed resin, a synthetic resin such as polyethylene (PE) and polypropylene (PP) may also be used.
  • A prominent section 12c is at the central portion portion (middle portion) in the vehicle width direction on the front surface 12a of the pressing element 12 educated. The previous section 12c stands from the vehicle front side of the front surface 12a of the pressing element 12 in front. In particular, the preceding section is available 12c from the front of the vehicle by x mm (see 12 ). The previous section 12c has, when viewed from a vehicle side, a cross-sectional shape formed in a rectangular shape and is at a position opposite to the recess portion along the vehicle width direction 2c arranged (detection tube element 3 ). The cross-sectional shape of the projecting portion 12c is in this respect not limited to the rectangular shape, but may, for example, have a semicircular shape.
  • Here is the detection tube element 3 a hollow tubular member made of synthetic rubber having flexibility, and in which the hollow body 3a is formed, so that when the detection tube element 3 through the preceding section 12c of the pressing element 12 is pressed to the vehicle front side, the detection tube element 3 is deformed in the vehicle longitudinal direction. In this way, at least a portion in the vehicle width direction of the detection tube member 3 (In this case, the central portion portion in the vehicle width direction) brought into a state in which the detection tube element 3 in the recess section 2c is compressed in the vehicle longitudinal direction by a certain amount. In particular, in one, in 12 Example shown: L1 = 8 mm, x = 1 mm, L'1 = L1 - x = 7 mm. Further, the outer diameter D of the detection tube element 3 about 8 mm. Thus, the detection tube element 3 at the central portion area in the vehicle width direction in FIG the recess section 2c fitted in a state in which the detection tube element 3 is compressed in the vehicle longitudinal direction by about 1 mm.
  • Whereas, at the end portion region in the vehicle width direction (corner portion) shown in FIG 13 , on the front surface 12a of the pressing element 12 no previous section 12c is formed. Furthermore, the length L2 in the recess portion 2c in the vehicle longitudinal direction to almost the same length as the length (outer diameter D) of the detection tube element 3 set in the vehicle longitudinal direction. For this reason, the detection tube element 3 at the end portion region in the vehicle width direction in the recess portion 2c fitted in a state in which the detection tube element 3 is not compressed in the vehicle longitudinal direction.
  • In short, in the third embodiment, the pressing member 12 with the preceding section 12c formed only at the central portion region in the vehicle width direction, between the rear surface 2 B of the bumper absorber 2 and the front surface 9a the bumper reinforcement 9 arranged, wherein the detection tube element 3 in the recess section 2c is fitted in a state in which the central portion portion in the vehicle width direction of the detection tube member 3 is compressed in the vehicle longitudinal direction by the predetermined amount.
  • In this regard, similar to the first embodiment, the length A (thickness) of the bumper absorber 2 in the vehicle longitudinal direction according to a position in the vehicle width direction different (see 11 ). In particular, the length A1 of the bumper absorber 2 in the vehicle longitudinal direction at the central portion portion in the vehicle width direction (middle portion) shown in FIG 12 , larger (thicker) than the length A2 of the bumper absorber 2 in the vehicle longitudinal direction at the end portion region in the vehicle width direction (corner portion) shown in FIG 13 ,
  • The vehicle impact detecting device described above 1 The third embodiment is characterized by the pressing member 12 which the detection tube element 3 presses to thereby the detection tube element 3 in a state in which the detection tube element 3 in the vehicle longitudinal direction is compressed by the predetermined amount, and at the vehicle rear side of the detection tube member 3 in the recess section 2c is arranged.
  • The third embodiment can also produce the same effect as the first embodiment. In other words: the pressing element 12 which the detection tube element 3 presses to thereby the detection tube element 3 in a state in which the detection tube element 3 is compressed in the vehicle longitudinal direction by the predetermined amount is at the vehicle rear side of the detection tube element 3 in the recess section 2c formed so that the detection tube element 3 in the recess section 2c can be fitted in a state in which at least a portion in the vehicle width direction of the detection tube member 3 (central portion portion in the vehicle width direction) has previously been compressed in the vehicle longitudinal direction by the predetermined amount. In this way, an increase in the output of the pressure sensor 4 can be accelerated at the central portion portion in the vehicle width direction, and thus the impact detection accuracy of the vehicle impact detecting device 1 be improved.
  • In particular, the length L of the recess portion 2c in the vehicle longitudinal direction are not changed depending on a position in the vehicle width direction and the pressing member 12 is at the vehicle rear side of the detection tube element 3 in the recess section 2c educated. In this way, by a simple construction that in the recess portion 2c fitted detection tube element 3 be brought into a state in which the detection tube element 3 is compressed in the vehicle longitudinal direction by the predetermined amount.
  • In addition, the vehicle impact detecting device is 1 the third embodiment, characterized in that the pressing element 12 made of a harder material than the bumper absorber 2 , According to this construction, the pressing member is made 12 made of a harder material than the bumper absorber 2 such that by pressing the hollow detection tube element 3 through the pressing element 12 the detection tube element 3 can be brought into a state in which the detection tube member is securely compressed in the vehicle longitudinal direction by the predetermined amount.
  • Furthermore, the vehicle impact detection device 1 the third embodiment, characterized in that the recess portion 2c on the back surface 2 B of the bumper absorber 2 is formed and that the pressing element 12 between the back surface 2 B of the bumper absorber 2 and the front surface 9a the bumper reinforcement 9 is arranged.
  • According to this construction, the pressing member 12 arranged in such a way that it is between the rear surface 2 B of the bumper absorber 2 and the front surface 9a the bumper reinforcement 9 is layered, therefore, the pressing element 12 be stably arranged. Furthermore, the pressing element 12 on the vehicle rear side of the recess section 2c formed, which thus the the detection tube element 3 can safely prevent from the inside of the recess portion 2c falling out.
  • Furthermore, the vehicle impact detection device 1 the third embodiment, characterized in that the pressing element 12 a protruding section 12c which is at a position opposite to the recess portion 12c is formed and protrudes to the vehicle front, and that the above section 12c the detection tube element 3 pressed to the vehicle front.
  • According to this construction, the detection tube element becomes 3 through the preceding section 12c pressed to the vehicle front, which at the position opposite the recess portion 2c is arranged, whereby the in the recess portion 2c fitted detection tube element 3 can be safely deformed in the vehicle longitudinal direction and thus an increase in the output of the pressure sensor 4 can be safely accelerated at the central portion portion in the vehicle width direction.
  • Further, the vehicle impact detecting device is 1 the third embodiment, characterized in that the pressing element 12 on the back surface 2 B of the bumper absorber 2 is arranged along the vehicle width direction. According to this construction, the pressing member 12 on the back surface 2 B of the bumper absorber 2 arranged along the vehicle width direction, whereby a distance between the pressing member can be prevented 12 and the bumper reinforcement 9 is formed along the vehicle width direction. This may be the detection tube element 3 safely prevent it from shifting to the vehicle rear, and thus correctly detect the impact.
  • Furthermore, the vehicle impact detection device 1 the third embodiment, characterized in that the projecting portion 12c at least a portion in the vehicle width direction (in this case, at the central portion portion in the vehicle width direction) of the pressing member 12 is formed. According to this construction, the detection tube element becomes 3 through the preceding section 12c of the pressing element 12 so that in at least a portion in the vehicle width direction (central portion region in the vehicle width direction), the length L 'of the detection tube member 3 in the vehicle longitudinal direction in a state in which the detection tube element 3 in the recess section 2c is fitted smaller than the outer diameter D of the detection tube member 3 can be made. In this way, an increase in the output of the pressure sensor 4 be accelerated at the central portion area in the vehicle width direction.
  • Fourth Embodiment
  • Next, a fourth embodiment will be described with reference to FIG 14 described. In this regard, the same parts as in the first embodiment in the 14 are denoted by the same reference numerals and their descriptions omitted, and only different parts thereof will be described. In the fourth embodiment, a pressing member 121 for pressing the detection tube element 3 from the vehicle rear side to the vehicle front side in the recess section 2c , disposed at the central portion portion (middle portion) in the vehicle width direction, as shown in FIG 14 is shown.
  • The pressing element 121 is an element shaped like a rectangular plate and extending along the vehicle width. The pressing element 121 is made of a harder material than the bumper absorber 2 For example, a foamed resin having a lower expansion ratio than the bumper absorber 2 , A length of the pressing element 121 in a vehicle height direction becomes smaller than a length of an open area 2d the recess section 2c set in the vehicle height direction. For this reason, when the detection tube element 3 in the recess section 2c of the bumper absorber 2 is fitted and then the pressing element 121 from the open area 2d the recess section 2c in the direction of the vehicle front (depth of the recess section 2c ) is pressed, the pressing element 121 in the recess section 2c be arranged. Further, a length x of the pressing member 121 in the vehicle longitudinal direction about 1 mm.
  • When the pressing element 121 in the recess section 2c is pressed, the detection tube element 3 at the central portion portion in the vehicle width direction is brought into a state in which the detection tube element 3 in the vehicle longitudinal direction in the recess portion 2c compressed by about 1 mm. In one, in 14 For example, L1 = 8mm, x = 1mm, L '1 = L1 - x = 8-1 = 7mm.
  • On the other hand, although not shown in the drawings, at the end portion region in the vehicle width direction (corner portion), the pressing member is 121 in the recess section 2c educated. Furthermore, the length L2 of the recess portion 2c in the vehicle longitudinal direction to almost the same length as the length (outer diameter D) of the detection tube element 3 in the vehicle longitudinal direction. For this reason, the detection tube element 3 at the end portion region in the vehicle width direction in the recess portion 2c fitted in a state in which the detection tube element 3 is not compressed in the vehicle longitudinal direction.
  • In short, in the fourth embodiment, the pressing member 121 only in the recess section 2c arranged on the central portion region in the vehicle width direction, wherein the detection tube element 3 in the recess section 2c is fitted in a state in which the detection tube element 3 at the central portion portion in the vehicle width direction in the vehicle longitudinal direction by a length of the pressing member 121 compressed in the vehicle longitudinal direction.
  • In this regard, although not shown in the drawings, similar to the first embodiment, a length A1 of the bumper absorber 2 in the vehicle longitudinal direction at the central portion portion in the vehicle width direction (middle portion) made larger (thicker), as a length A2 of the bumper absorber 2 in the vehicle longitudinal direction at the end portion region in the vehicle width direction (corner portion).
  • The vehicle impact detecting device described above 1 the fourth embodiment is characterized in that the pressing element 121 which the detection tube element 3 presses to thereby the detection tube element 3 in a state in which the detection tube element 3 in the vehicle longitudinal direction is compressed by a certain amount, on the vehicle rear side of the detection tube element 3 in the recess section 2c is formed.
  • Also, the fourth embodiment can produce the same effect as the first embodiment. In other words: the pressing element 121 which the detection tube element 3 presses to thereby the detection tube element 3 in a state in which the detection tube element 3 is compressed in the vehicle longitudinal direction by the predetermined amount is in the vehicle longitudinal direction of the detection tube element 3 in the recess section 2c formed so that the detection tube element 3 in the recess section 2c can be fitted in a state in which previously at least a portion in the vehicle width direction of the detection tube element 3 (central portion portion in the vehicle width direction) has been compressed in the vehicle longitudinal direction by the predetermined amount. In this way, an increase in the output of the pressure sensor 4 can be accelerated at the central portion portion in the vehicle width direction, and thus the impact detection accuracy of the vehicle impact detecting device 1 be improved.
  • Further, similar to the third embodiment, the length L of the recess portion 2c in the vehicle longitudinal direction are not changed according to a position in the vehicle width direction and the pressing member 121 is at the vehicle rear side of the detection tube element 3 in the recess section 2c formed so that by a simple construction in the recess portion 2c fitted detection tube element 3 can be brought into a state in which the detection tube element 3 is compressed in the vehicle longitudinal direction by the predetermined amount. Further, only by shifting a position of the pressing member 121 in the vehicle width direction, a position are easily changed, at which the detection tube element 3 is compressed in the vehicle longitudinal direction by the predetermined amount. Furthermore, by changing the length (thickness) of the pressing member 121 in the vehicle longitudinal direction appropriately, an amount of compression of the detection tube member 3 be easily adjusted in the vehicle longitudinal direction.
  • In this regard, a position at which the pressing member 121 is arranged, not on the vehicle rear side of the detection tube element 3 in the recess section 2c limited. As in 15 is shown, the pressing element 121 on the vehicle front side of the detection tube element 3 in the recess section 2c be arranged. Also in this case, the same effect as in the fourth embodiment described above can be produced.
  • The present invention is not limited to the above-described embodiments, but may be variously changed or expanded to an extent without departing from the gist of the present invention. Modifications of the above-described embodiments will be described below. For example, the pressure sensor 4 in the above-described embodiments, on the rear surface 9b the bumper reinforcement 9 attached. However, the position at which the pressure sensor is 4 is arranged, not limited thereto, but can be changed appropriately.
  • Furthermore, in the first embodiment, the length L of the recess portion 2c in the vehicle longitudinal direction smaller than the length (outer diameter D) of the detection tube element 3 in the vehicle longitudinal direction at the central portion portion in the vehicle width direction, however, the present invention is not limited thereto. The length L of the recess portion 2c in the vehicle longitudinal direction may be formed smaller at the position in the vehicle width direction, at which the length A of the bumper absorber 2 is larger in the vehicle longitudinal direction. For example, at a position in the vehicle width direction at which the length A of the bumper absorber 2 in the vehicle longitudinal direction is 40 mm or more, the length L of the recess portion 2c in the vehicle longitudinal direction is smaller than the length of the detection tube element 3 in the vehicle longitudinal direction (outer diameter D). Further, in a case where the length A2 of the bumper absorber 2 in the vehicle longitudinal direction at the end portion region in the vehicle width direction is thick, the length L2 of the recess portion 2c in the vehicle longitudinal direction at the end portion region in the vehicle width direction may be smaller than the length (outer diameter D) of the detection tube member 3 in the vehicle longitudinal direction. In addition, according to the length A of the bumper absorber 2 in the vehicle longitudinal direction, the length L of the recess portion 2c be set in the vehicle longitudinal direction by a few mm in the vehicle width direction.
  • In addition, in the embodiments described above, cases have been described in which the length A of the bumper absorber 2 is different in the vehicle longitudinal direction in the vehicle width direction, however, the present invention is not limited thereto. For example, the present invention can also be applied to a case where the length A (thickness) of the bumper absorber 2 along the vehicle width direction is uniform. In this case, the length L of the recess portion 2c in the vehicle longitudinal direction at the end portion region in the vehicle width direction (corner region) smaller than the outer diameter D of the detection tube element 3 be. In this way, in the corner area in which the impact caused by the impact (external force) to the side of the vehicle is weakened and thus hard to the detection tube element 3 can be transmitted, the output of the pressure sensor 4 be generated sufficiently.
  • Further, in the above-described embodiments, in a case where the effective mass is equal to or greater than a predetermined threshold in the impact determination processing, it is determined that the impact of the vehicle with the pedestrian, which is an activation of the pedestrian protection device 10 required, caused, but not limited to. For example, one, through the pressure sensor 4 detected, pressure value, a pressure change rate or the like may be used as a threshold in the impact determination processing.
  • Although the present invention has been described with reference to the embodiments thereof, it is to be understood that the disclosure is not limited to the embodiments and constructions. The present disclosure includes various modifications and equivalent arrangements. Furthermore, the various combinations and configurations, including more, less or only individual elements, are included within the scope and scope of the present disclosure.

Claims (13)

  1. Vehicle impact detection device ( 1 ) comprising: a bumper absorber ( 2 ) located on a vehicle front side of a bumper reinforcement ( 9 ) in a bumper ( 7 ) is arranged of a vehicle; a detection tube element ( 3 ), which at a recess section ( 2c ) attached to the bumper absorber ( 2 ) is formed to extend in a vehicle width direction, and therein a hollow body ( 3a ); and a pressure sensor ( 4 ), the pressure in the hollow body ( 3a ) of the detection tube element ( 3 ), wherein: the vehicle impact detecting device detects a collision of an object on the bumper (FIG. 7 ) based on a pressure detection result by the pressure sensor ( 4 ) detected; and the detection tube element ( 3 ) at the recess section ( 2c ) is attached in a state in which at least a part of the detection tube element ( 3 ) is compressed in the vehicle width direction by a predetermined amount in a vehicle longitudinal direction.
  2. A vehicle impact detecting device according to claim 1, wherein: the recess portion (FIG. 2c ) has a length (L, L1, L2) in the vehicle longitudinal direction which is different according to its position in the vehicle width direction; and at least a portion of the recess portion (FIG. 2c ) in the vehicle width direction has a length (L1) in the vehicle longitudinal direction that is shorter than a length (D) of the detection tube element (FIG. 3 ) in the vehicle longitudinal direction.
  3. A vehicle impact sensing device according to claim 1 or 2, wherein: the bumper absorber (10) 2 ) has a length (A, A1, A2, A ', A'1, A'2) in the vehicle longitudinal direction which is different according to its position in the vehicle width direction; and a length of the recess portion (FIG. 2c ) in the vehicle longitudinal direction according to the length of the bumper absorber ( 2 ) is set in the vehicle longitudinal direction.
  4. A vehicle impact detecting device according to claim 3, wherein said recess portion (16) 2c ) is formed so that at the position in the vehicle width direction at which the length of the bumper absorber ( 2 ) is greater in the vehicle longitudinal direction, the length of the recess portion ( 2c ) is smaller in the vehicle longitudinal direction.
  5. A vehicle impact detecting device according to claim 1 or 2, wherein a length of the recess portion (FIG. 2c ) is formed in the vehicle longitudinal direction such that at a position in the vehicle width direction at which a length (A, A1, A2, A ', A'1, A'2) in the vehicle longitudinal direction of a front surface ( 2a ) of the bumper absorber ( 2 ) to an inner wall surface of the recess portion (FIG. 2c ) on a vehicle rear side or to an open area ( 2d ) of the recess section ( 2c ) is greater, the length (L) of the recess portion ( 2c ) is smaller in the vehicle longitudinal direction.
  6. Vehicle crash detection device according to one of claims 2 to 5, wherein the length of the recess portion ( 2c ) in the vehicle longitudinal direction is smaller than the length of the detection tube element ( 3 ) in the vehicle longitudinal direction at a central portion portion of the recess portion (FIG. 2c ) in the vehicle width direction.
  7. A vehicle impact detecting apparatus according to any one of claims 1 to 6, wherein: the recess portion (Fig. 2c ) on a rear surface ( 2 B ) of the bumper absorber ( 2 ) is formed; and the back surface ( 2 B ) of the bumper absorber ( 2 ) with a front surface ( 9a ) the bumper reinforcement ( 9 ) is in contact.
  8. Vehicle impact detection device according to one of claims 1 to 7, which also comprises a pressing element ( 12 . 121 ), which the detection tube element ( 3 ) presses around the detection tube element ( 3 ) in the state in which the detection tube element ( 3 ) by a predetermined amount in the vehicle front-rear direction, at least one of the vehicle front side and the vehicle-rear side of the detection tube element (FIG. 3 ) in the recess section ( 2c ) is compressed.
  9. Vehicle crash detection device according to claim 8, wherein the pressing element ( 12 . 121 ) made of a harder material than the bumper absorber ( 2 ) consists.
  10. A vehicle impact detecting apparatus according to claim 8 or 9, wherein: said recess portion (Fig. 2c ) on the rear surface ( 2 B ) of the bumper absorber ( 2 ) is formed; and the pressing element ( 12 ) between the rear surface ( 2 B ) of the bumper absorber ( 2 ) and a front surface ( 9a ) the bumper reinforcement ( 9 ) is arranged.
  11. A vehicle impact sensing device according to claim 10, wherein: 12 ) a preceding section ( 12c ) located at a position opposite to the recess portion (FIG. 2c ) is formed to protrude in the direction of the vehicle front; and the previous section ( 12c ) the detection tube element ( 3 ) in the direction of the vehicle front side.
  12. Vehicle crash detection device according to claim 10 or 11, wherein the pressing element ( 12 ) on the rear surface ( 2 B ) of the bumper absorber ( 2 ) is arranged in the entire vehicle width direction.
  13. A vehicle impact detecting apparatus according to claim 11 or 12, wherein said projecting portion (Fig. 12c ) on at least part of the pressing element ( 12 ) is formed in the vehicle width direction.
DE112016000665.9T 2015-02-09 2016-02-03 Vehicle collision detection device Pending DE112016000665T5 (en)

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JP2015-023229 2015-02-09
JP2015023229A JP6432376B2 (en) 2015-02-09 2015-02-09 Vehicle collision detection device
PCT/JP2016/000555 WO2016129251A1 (en) 2015-02-09 2016-02-03 Vehicle impact detection device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3093046A1 (en) * 2019-02-25 2020-08-28 Psa Automobiles Sa Bumper structure sub-assembly comprising a damping element associated with an impact sensor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10369947B2 (en) * 2017-08-24 2019-08-06 Gm Global Technology Operation Llc Bumper collision sensor for an automotive vehicle

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0867142A (en) * 1994-08-26 1996-03-12 Nagoya Yuka Kk Cushioning material
JPH08136368A (en) * 1994-11-07 1996-05-31 Nippon Soken Inc Sensor for detecting collision of vehicle
JP4005255B2 (en) * 1998-02-24 2007-11-07 株式会社豊田中央研究所 Vehicle collision determination device
JP5013157B2 (en) * 2005-10-28 2012-08-29 株式会社デンソー Vehicle collision detection device
JP2009023405A (en) * 2007-07-17 2009-02-05 Denso Corp Collision detection sensor
JP5302643B2 (en) * 2008-12-02 2013-10-02 株式会社デンソー Collision detection device and collision detection method
KR101775382B1 (en) * 2011-02-22 2017-09-06 콘티넨탈 오토모티브 게엠베하 Crash sensor having an elastically deformable tube and at least one pressure sensor
DE102012004766A1 (en) * 2012-03-08 2012-11-29 Daimler Ag Vehicle i.e. bicycle, has bumper unit with impact element, where cross-section area of impact element is larger than sum of areas of surface of aperture of groove and surfaces of impact element extending towards bending cross beam
JP2014104805A (en) * 2012-11-26 2014-06-09 Toyota Motor Corp Vehicle bumper including pedestrian collision detection device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3093046A1 (en) * 2019-02-25 2020-08-28 Psa Automobiles Sa Bumper structure sub-assembly comprising a damping element associated with an impact sensor
WO2020174161A1 (en) * 2019-02-25 2020-09-03 Psa Automobiles Sa Bumper structure subassembly comprising a damper element associated with an impact sensor

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