JP2009179128A - Pedestrian collision sensing device - Google Patents

Pedestrian collision sensing device Download PDF

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Publication number
JP2009179128A
JP2009179128A JP2008018624A JP2008018624A JP2009179128A JP 2009179128 A JP2009179128 A JP 2009179128A JP 2008018624 A JP2008018624 A JP 2008018624A JP 2008018624 A JP2008018624 A JP 2008018624A JP 2009179128 A JP2009179128 A JP 2009179128A
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chamber member
pedestrian collision
chamber
pedestrian
collision detection
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JP5104347B2 (en
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Takatoshi Tanabe
貴敏 田辺
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Denso Corp
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Denso Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/48—Bumpers, 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
    • B60R19/483—Bumpers, 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical 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
    • B60R21/0136—Electrical 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pedestrian collision sensing device capable of exerting collision sensing performance based on deformation and internal pressure rise upon pedestrian collision without causing damage to a chamber member. <P>SOLUTION: The chamber member 6 comprises materials having 500 MPa flexural modulus or less, therefore, collapse load tolerance upon pedestrian collision becomes 2 kN or less, and impact absorbing performance of an absorber 5 (reaction force upon pedestrian collision is 6-8 kN) provided in a bumper 2 is not adversely affected. Besides, the chamber member 6 comprises materials having 5 MPa tensile yield stress or more, therefore, pressure tolerance inside a chamber area 6a becomes 100 kPa or more, preventing burst due to internal pressure rise caused by pedestrian collision. Moreover, since the chamber member 6 comprises materials having 300% tensile breaking elongation or more, crack does not occur due to collapse and deformation upon pedestrian collision. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、車両に取り付けられ車両に対する歩行者の衝突を検知する歩行者衝突検知装置に関し、詳しくは、チャンバ部材を備えた圧力式の歩行者衝突検知装置に関する。   The present invention relates to a pedestrian collision detection device that is attached to a vehicle and detects a pedestrian collision with the vehicle, and more particularly to a pressure pedestrian collision detection device that includes a chamber member.

従来、車両のバンパへの歩行者の衝突を検知するための歩行者衝突検知装置として、車両のバンパ内でサイドメンバに固定されるバンパレインフォースメントより前方に配置され、略密閉されたチャンバ空間を区画するチャンバ部材と、チャンバ空間の圧力を検出する圧力センサとを有し、チャンバ空間内の圧力の変動から車両と歩行者との衝突を検知するように構成された圧力式の歩行者衝突検知装置が提案されている（例えば、特許文献１等参照。）。
特開２００７−２９０６８９号公報 Conventionally, as a pedestrian collision detection device for detecting a pedestrian collision with a vehicle bumper, a chamber space that is disposed in front of a bumper reinforcement fixed to a side member in the vehicle bumper and is substantially sealed. A pressure-type pedestrian collision having a chamber member that divides the chamber and a pressure sensor that detects a pressure in the chamber space and configured to detect a collision between the vehicle and the pedestrian from a fluctuation in pressure in the chamber space A detection device has been proposed (see, for example, Patent Document 1).
JP 2007-290689 A

上述したチャンバ部材を備えた圧力式の歩行者衝突検知装置において、衝突検知性能が正常に発揮されるためには、チャンバ部材が歩行者衝突に伴う変形や内圧上昇によって割れや破裂等の破損が生じないことが必要とされる。   In the pressure type pedestrian collision detection apparatus provided with the chamber member described above, in order for the collision detection performance to be normally exhibited, the chamber member is damaged due to deformation caused by pedestrian collision or an increase in internal pressure. It needs to not happen.

本発明は上記課題に鑑みてなされたものであり、歩行者衝突時の変形や内圧上昇によってチャンバ部材に破損が生じることなく衝突検知性能を発揮可能な歩行者衝突検知装置を提供することを目的とする。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a pedestrian collision detection device capable of exhibiting collision detection performance without causing damage to a chamber member due to deformation or increase in internal pressure during a pedestrian collision. And

以下、上記課題を解決するのに適した各手段につき、必要に応じて作用効果等を付記しつつ説明する。   Hereinafter, each means suitable for solving the above-described problems will be described with additional effects and the like as necessary.

１．車両のバンパ内でサイドメンバに固定されるバンパレインフォースメントより前方に配置され、略密閉されたチャンバ空間を区画するチャンバ部材と、前記チャンバ空間の圧力を検出する圧力センサとを有し、前記チャンバ空間内の圧力の変動から前記車両と歩行者との衝突を検知する歩行者衝突検知装置であって、
前記チャンバ部材は、曲げ弾性率が５００ＭＰａ以下であり、且つ引張降伏応力が５ＭＰａ以上であり、且つ引張破断伸びが３００％以上である材料からなることを特徴とする歩行者衝突検知装置。 1. A chamber member that is disposed in front of a bumper reinforcement fixed to a side member in a bumper of the vehicle and that defines a substantially sealed chamber space; and a pressure sensor that detects a pressure in the chamber space, A pedestrian collision detection device for detecting a collision between the vehicle and a pedestrian from a change in pressure in a chamber space,
The pedestrian collision detection device, wherein the chamber member is made of a material having a flexural modulus of 500 MPa or less, a tensile yield stress of 5 MPa or more, and a tensile breaking elongation of 300% or more.

手段１によれば、チャンバ部材は、曲げ弾性率が５００ＭＰａ以下である材料からなるので、歩行者衝突時の許容潰れ荷重が２ｋＮ以下となり、バンパ内に設けられるアブソーバ（歩行者衝突時の反力が６〜８ｋＮ）の衝撃吸収性能を阻害することがない。また、チャンバ部材は、引張降伏応力が５ＭＰａ以上である材料からなるので、チャンバ空間内の許容圧力が１００ｋＰａ以上となり、歩行者衝突に伴う内圧上昇によって破裂が生じることがない。また、チャンバ部材は、引張破断伸びが３００％以上である材料からなるので、歩行者衝突時の潰れ変形によって割れが生じることがない。従って、チャンバ部材が歩行者衝突に伴う変形や内圧上昇によって損傷を生じることなく衝突検知性能を発揮することができる。   According to the means 1, since the chamber member is made of a material having a bending elastic modulus of 500 MPa or less, the allowable crushing load at the time of pedestrian collision is 2 kN or less, and the absorber provided in the bumper (reaction force at the time of pedestrian collision) However, the impact absorbing performance of 6 to 8 kN) is not hindered. Moreover, since the chamber member is made of a material having a tensile yield stress of 5 MPa or more, the allowable pressure in the chamber space is 100 kPa or more, and no rupture occurs due to an increase in internal pressure due to a pedestrian collision. Moreover, since the chamber member is made of a material having a tensile elongation at break of 300% or more, no crack is generated due to the crushing deformation at the time of pedestrian collision. Accordingly, the collision detection performance can be exhibited without causing damage to the chamber member due to deformation or increase in internal pressure caused by a pedestrian collision.

２．前記チャンバ部材の材料は、低密度ポリエチレンであることを特徴とする手段１に記載の歩行者衝突検知装置。   2. The pedestrian collision detection apparatus according to claim 1, wherein the material of the chamber member is low density polyethylene.

手段２によれば、チャンバ部材の材料が低密度ポリエチレンであるので、耐環境性に優れ軟質であり且つ強度にも優れている。   According to the means 2, since the material of the chamber member is low density polyethylene, it is excellent in environmental resistance and is soft and excellent in strength.

３．前記チャンバ部材の材料は、メルトマスフローレートが０．５〜２．０ｇ／１０ｍｉｎであることを特徴とする手段１又は２に記載の歩行者衝突検知装置。   3. The pedestrian collision detection device according to means 1 or 2, wherein the material of the chamber member has a melt mass flow rate of 0.5 to 2.0 g / 10 min.

手段３によれば、チャンバ部材の材料は、メルトマスフローレートが０．５〜２．０ｇ／１０ｍｉｎであるので、ブロー成型によって袋状のチャンバ部材を容易に製造することができる。   According to the means 3, since the material of the chamber member has a melt mass flow rate of 0.5 to 2.0 g / 10 min, a bag-shaped chamber member can be easily manufactured by blow molding.

４．前記チャンバ部材は、樹脂材料をブロー成型したものであることを特徴とする手段１乃至３のいずれか１つに記載の歩行者衝突検知装置。   4). 4. The pedestrian collision detection device according to any one of means 1 to 3, wherein the chamber member is formed by blow molding a resin material.

手段４によれば、チャンバ部材は、樹脂材料をブロー成型することにより容易に製造することができる。   According to the means 4, the chamber member can be easily manufactured by blow molding a resin material.

５．前記チャンバ部材の材料は、ピカット軟化温度が９０℃以上であることを特徴とする手段１乃至４のいずれか１つに記載の歩行者衝突検知装置。   5). 5. The pedestrian collision detection device according to any one of means 1 to 4, wherein the material of the chamber member has a Picat softening temperature of 90 ° C. or higher.

手段５によれば、チャンバ部材の材料は、ピカット軟化温度が９０℃以上であるので、歩行者衝突検知装置の使用環境温度（−３０℃〜８０℃）における耐高温環境性能を満足している。   According to the means 5, since the material for the chamber member has a Picat softening temperature of 90 ° C. or higher, it satisfies the high temperature resistance environmental performance at the use environment temperature (−30 ° C. to 80 ° C.) of the pedestrian collision detection device. .

６．前記チャンバ部材の材料は、脆化温度が−４５℃以下であることを特徴とする手段１乃至５のいずれか１つに記載の歩行者衝突検知装置。   6). The pedestrian collision detection device according to any one of means 1 to 5, wherein the material of the chamber member has an embrittlement temperature of -45 ° C or lower.

手段６によれば、チャンバ部材の材料は、脆化温度が−４５℃以下であるので、歩行者衝突検知装置の使用環境温度（−３０℃〜８０℃）における耐低温環境性能を満足している。   According to the means 6, since the material of the chamber member has an embrittlement temperature of −45 ° C. or lower, the low temperature environment performance at the use environment temperature (−30 ° C. to 80 ° C.) of the pedestrian collision detection device is satisfied. Yes.

以下、本発明の歩行者衝突検知装置を具体化した一実施形態について図面を参照しつつ具体的に説明する。図１は、本発明の一実施形態の歩行者衝突検知装置Ｓを搭載した車両のバンパ２付近を透視して示す模式平面図である。図２は、図１におけるバンパ２のＡ−Ａ線断面図である。   DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which a pedestrian collision detection device of the present invention is embodied will be specifically described with reference to the drawings. FIG. 1 is a schematic plan view showing the vicinity of a bumper 2 of a vehicle equipped with a pedestrian collision detection device S according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the bumper 2 in FIG.

図１及び図２に示すように、車体１内部には車幅方向両側にて車両前後方向に延在する一対のサイドメンバ３が設けられている。バンパ２内にはサイドメンバ３の車両前方側にバンパレインフォースメント４が固定され、さらに、バンパレインフォースメント４の車両前方側には、アブソーバ５と、チャンバ部材６とが設けられている。また、バンパレインフォースメント４には圧力センサ７が取り付けられている。さらに、バンパレインフォースメント４、アブソーバ５及びチャンバ部材６を覆うように車両幅方向に延びるバンパカバー８が取り付けられている。   As shown in FIGS. 1 and 2, a pair of side members 3 extending in the vehicle front-rear direction are provided inside the vehicle body 1 on both sides in the vehicle width direction. In the bumper 2, a bumper reinforcement 4 is fixed on the vehicle front side of the side member 3, and an absorber 5 and a chamber member 6 are provided on the vehicle front side of the bumper reinforcement 4. A pressure sensor 7 is attached to the bumper reinforcement 4. Furthermore, a bumper cover 8 extending in the vehicle width direction is attached so as to cover the bumper reinforcement 4, the absorber 5, and the chamber member 6.

バンパレインフォースメント４は、車両幅方向（左右方向）に延在する構造部材であって、図２に示すように、内部中央に梁が設けられた日の字状断面を有する中空部材である。   The bumper reinforcement 4 is a structural member extending in the vehicle width direction (left-right direction), and as shown in FIG. 2, is a hollow member having a Japanese character-shaped cross section in which a beam is provided in the center of the interior. .

アブソーバ５は、衝突エネルギーを吸収可能な発泡樹脂等の弾性体からなり、バンパ２内の下部であってバンパレインフォースメント４の車両前方側にてバンパレインフォースメント４に沿って幅方向に延在して設けられている。   The absorber 5 is made of an elastic body such as foamed resin that can absorb collision energy, and extends in the width direction along the bumper reinforcement 4 at the lower part of the bumper 2 and on the front side of the bumper reinforcement 4 in the vehicle. Is provided.

チャンバ部材６は、略密閉されたチャンバ空間６ａを区画する部材であって、バンパ２内上部のアブソーバ５上方であってバンパレインフォースメント４の車両前方側にてバンパレインフォースメント４に沿って幅方向に延在して設けられている。また、チャンバ部材６の後端面には、圧力センサ７の圧力導入部７ｂを差し込むための挿入孔６ｂが開口している。尚、チャンバ部材６の材質及び物性については後述する。   The chamber member 6 is a member that divides a substantially sealed chamber space 6a. The chamber member 6 is above the absorber 5 in the upper part of the bumper 2 and along the bumper reinforcement 4 on the front side of the bumper reinforcement 4 in the vehicle. It is provided extending in the width direction. Further, an insertion hole 6 b for inserting the pressure introducing portion 7 b of the pressure sensor 7 is opened at the rear end surface of the chamber member 6. The material and physical properties of the chamber member 6 will be described later.

圧力センサ７は、気体の圧力変化を検知可能な公知のセンサであって、センサ本体７ａと、センサ本体７ａへ気体を導入するための管状の圧力導入部７ｂとを有している。センサ本体７ａは、バンパレインフォースメント４に取り付けられ、圧力導入部７ｂの先端部がチャンバ部材６の挿入孔６ｂに挿入されている。尚、挿入孔６ｂ内周と圧力導入部７ｂとの間にはわずかな隙間が形成されており、この隙間が呼吸孔として作用するので、衝突が発生していない通常の状態においてはチャンバ空間６ａ内の気圧が外気と同一（大気圧）に保たれる。   The pressure sensor 7 is a known sensor capable of detecting a change in gas pressure, and includes a sensor main body 7a and a tubular pressure introducing portion 7b for introducing gas into the sensor main body 7a. The sensor body 7 a is attached to the bumper reinforcement 4, and the distal end portion of the pressure introducing portion 7 b is inserted into the insertion hole 6 b of the chamber member 6. A slight gap is formed between the inner periphery of the insertion hole 6b and the pressure introducing portion 7b, and this gap acts as a breathing hole. Therefore, in a normal state where no collision occurs, the chamber space 6a The internal pressure is kept the same as the outside air (atmospheric pressure).

次に、チャンバ部材６の材質及び物性について説明する。チャンバ部材６は、樹脂材料をブロー成型することによって中空状のチャンバ空間６ａが形成される。チャンバ部材６に好適な樹脂材料は、例えば、低密度ポリエチレンである。   Next, the material and physical properties of the chamber member 6 will be described. The chamber member 6 is formed with a hollow chamber space 6a by blow molding a resin material. A resin material suitable for the chamber member 6 is, for example, low density polyethylene.

また、チャンバ部材６の材料として用いる低密度ポリエチレンは、メルトマスフローレートが０．５〜２．０ｇ／１０ｍｉｎであることが好ましい。メルトマスフローレートがこの範囲内であれば、チャンバ部材６をブロー成型によって厚さ０．５〜３ｍｍ程度の低密度ポリエチレンからなる袋状に形成することが可能である。   Moreover, it is preferable that the low density polyethylene used as a material of the chamber member 6 has a melt mass flow rate of 0.5 to 2.0 g / 10 min. If the melt mass flow rate is within this range, the chamber member 6 can be formed into a bag shape made of low-density polyethylene having a thickness of about 0.5 to 3 mm by blow molding.

また、チャンバ部材６の材料の曲げ弾性率は、常温（２０±１５℃）で５００ＭＰａ以下である。ここで、図３は、チャンバ潰れピーク荷重と曲げ弾性率との関係を示すグラフである。チャンバ潰れピーク荷重とは、チャンバ部材６の潰れ時に発生するピーク荷重（反力の最大値）である。図３のグラフに示されるように、チャンバ潰れピーク荷重と曲げ弾性率との間には比例関係が成立している。ここで、アブソーバ５は、歩行者の脚部に損傷を与えないために、歩行者衝突時に発生する反力が６〜８ｋＮとなるように設定される。一方、チャンバ部材６は、アブソーバ５の衝撃吸収性能を阻害しないために軟らかい物性を有することが必要であり、歩行者衝突時に発生する反力、換言すればチャンバ部材６の許容潰れ荷重は、２ｋＮ以下であることが好ましい。よって、図３より、チャンバ部材６の許容潰れ荷重を２ｋＮ以下とするために、曲げ弾性率は５００ＭＰａ以下であることが必要ということがわかる。   Moreover, the bending elastic modulus of the material of the chamber member 6 is 500 MPa or less at normal temperature (20 ± 15 ° C.). Here, FIG. 3 is a graph showing the relationship between the chamber collapse peak load and the flexural modulus. The chamber collapse peak load is a peak load (maximum value of reaction force) generated when the chamber member 6 is collapsed. As shown in the graph of FIG. 3, a proportional relationship is established between the chamber collapse peak load and the flexural modulus. Here, the absorber 5 is set so that the reaction force generated at the time of the pedestrian collision is 6 to 8 kN so as not to damage the pedestrian's leg. On the other hand, the chamber member 6 needs to have a soft physical property so as not to disturb the shock absorbing performance of the absorber 5, and the reaction force generated at the time of a pedestrian collision, in other words, the allowable crushing load of the chamber member 6 is 2 kN. The following is preferable. Therefore, it can be seen from FIG. 3 that the bending elastic modulus needs to be 500 MPa or less in order to set the allowable crushing load of the chamber member 6 to 2 kN or less.

また、チャンバ部材６の材料の引張降伏応力は、常温で５ＭＰａ以上である。ここで、図４は、チャンバ内許容圧力と引張降伏応力との関係を示すグラフである。チャンバ内許容圧力とは、チャンバ部材６が破裂しない範囲で許容されるチャンバ空間６ａにおける最大圧力である。図４のグラフに示されるように、チャンバ内許容圧力と引張降伏応力との間には比例関係が成立している。そして、チャンバ部材６の最低必要チャンバ内圧、換言すれば歩行者衝突によって破裂しないために最低限必要となる許容圧力は、１００ｋＰａ以上である。よって、図４より、チャンバ部材６の材料の引張降伏応力は５ＭＰａ以上であることが必要ということがわかる。   Moreover, the tensile yield stress of the material of the chamber member 6 is 5 MPa or more at room temperature. Here, FIG. 4 is a graph showing the relationship between the allowable pressure in the chamber and the tensile yield stress. The allowable pressure in the chamber is the maximum pressure in the chamber space 6a that is allowed in a range where the chamber member 6 does not rupture. As shown in the graph of FIG. 4, a proportional relationship is established between the allowable pressure in the chamber and the tensile yield stress. And the minimum required chamber internal pressure of the chamber member 6, in other words, the allowable pressure required at least so as not to be ruptured by a pedestrian collision is 100 kPa or more. Therefore, FIG. 4 shows that the tensile yield stress of the material of the chamber member 6 needs to be 5 MPa or more.

また、チャンバ部材６の材料の引張破断伸びは、常温で３００％以上である。ここで、図５は、引張破断伸びとチャンバ部材６の衝突試験の結果との関係を示す図である。尚、衝突試験は、引張破断伸びの異なる複数のチャンバ部材６を用意し、人体衝突時相当の荷重をインパクタによってそれぞれ印加することにより行った。図５に示されるように、引張破断伸びが３００％以上の材料からなるチャンバ部材６は試験後に割れが発生していない。一方、引張破断伸びが３００％未満の材料からなるチャンバ部材は試験後に割れが発生している。これらの結果から、チャンバ部材６の材料の引張破断伸びは３００％以上であることが必要ということがわかる。   The tensile elongation at break of the material of the chamber member 6 is 300% or more at room temperature. Here, FIG. 5 is a diagram showing the relationship between the tensile elongation at break and the result of the collision test of the chamber member 6. The collision test was performed by preparing a plurality of chamber members 6 having different tensile break elongations and applying a load corresponding to a human body collision by an impactor. As shown in FIG. 5, the chamber member 6 made of a material having a tensile elongation at break of 300% or more has no crack after the test. On the other hand, the chamber member made of a material having a tensile elongation at break of less than 300% is cracked after the test. From these results, it can be seen that the tensile breaking elongation of the material of the chamber member 6 needs to be 300% or more.

また、チャンバ部材を含む歩行者衝突検知装置Ｓの使用温度環境は、−３０℃〜８０℃であり、保存温度環境は、−４０℃〜８５℃であるので、材料のピカット軟化温度は９０℃以上、脆化温度は−４５℃以下であることが好ましい。   Moreover, since the use temperature environment of the pedestrian collision detection apparatus S containing a chamber member is -30 degreeC-80 degreeC, and a preservation | save temperature environment is -40 degreeC-85 degreeC, the picart softening temperature of material is 90 degreeC. As described above, the embrittlement temperature is preferably −45 ° C. or lower.

次に、歩行者衝突検知装置Ｓのシステム構成及び作用について、図６を参照しつつ説明する。図６は、歩行者衝突検知装置Ｓのシステム構成を示すブロック図である。   Next, the system configuration and operation of the pedestrian collision detection device S will be described with reference to FIG. FIG. 6 is a block diagram showing a system configuration of the pedestrian collision detection device S. As shown in FIG.

歩行者衝突検知装置Ｓは、図６に示すように、圧力センサ７と、コントローラ１０とから構成されている。圧力センサ７は、コントローラ１０と信号線を介して接続されている。また、コントローラ１０は、歩行者保護装置２０と信号線を介して接続されている。   As shown in FIG. 6, the pedestrian collision detection device S includes a pressure sensor 7 and a controller 10. The pressure sensor 7 is connected to the controller 10 via a signal line. The controller 10 is connected to the pedestrian protection device 20 via a signal line.

圧力センサ７は、チャンバ部材６のチャンバ空間６ａから圧力導入部７ｂを介してセンサ本体７ａへ導入された圧力を検知して電気信号を出力する。   The pressure sensor 7 detects the pressure introduced from the chamber space 6a of the chamber member 6 into the sensor main body 7a via the pressure introducing portion 7b, and outputs an electrical signal.

コントローラ１０は、マイコンを内蔵する信号処理回路であって、圧力センサ７の出力信号に基づいて衝突物体が歩行者かどうかを判別し、この判別により衝突物体が歩行者と判断した場合に歩行者保護装置２０（たとえば公知の歩行者保護用のエアバッグやフード跳ね上げ装置など）へ起動信号を出力する。これにより、歩行者保護装置２０が作動して例えば、車両に衝突してボンネットに倒れ込んできた歩行者が受ける傷害値（歩行者が受ける衝撃）を低減し、歩行者が致命的なダメージを受けることを抑制することができる。   The controller 10 is a signal processing circuit with a built-in microcomputer, and determines whether or not the collision object is a pedestrian based on the output signal of the pressure sensor 7. An activation signal is output to the protection device 20 (for example, a well-known pedestrian protection airbag or hood flip-up device). Thereby, the pedestrian protection device 20 is activated, for example, the injury value (impact received by the pedestrian) received by the pedestrian who collides with the vehicle and falls into the hood is reduced, and the pedestrian receives fatal damage. This can be suppressed.

以上詳述したことから明らかなように、本実施形態によれば、チャンバ部材６は、曲げ弾性率が５００ＭＰａ以下である材料からなるので、歩行者衝突時の許容潰れ荷重が２ｋＮ以下となり、バンパ２内に設けられるアブソーバ５（歩行者衝突時の反力が６〜８ｋＮ）の衝撃吸収性能を阻害することがない。また、チャンバ部材６は、引張降伏応力が５ＭＰａ以上である材料からなるので、チャンバ空間６ａ内の許容圧力が１００ｋＰａ以上となり、歩行者衝突に伴う内圧上昇によって破裂が生じることがない。また、チャンバ部材６は、引張破断伸びが３００％以上である材料からなるので、歩行者衝突時の潰れ変形によって割れが生じることがない。従って、チャンバ部材６が歩行者衝突に伴う変形や内圧上昇によって損傷を生じることなく衝突検知性能を発揮することができる。   As is clear from the above detailed description, according to the present embodiment, the chamber member 6 is made of a material having a bending elastic modulus of 500 MPa or less, so that the allowable crushing load at the time of a pedestrian collision is 2 kN or less, and the bumper The shock absorbing performance of the absorber 5 (the reaction force at the time of pedestrian collision is 6 to 8 kN) provided in 2 is not hindered. Further, since the chamber member 6 is made of a material having a tensile yield stress of 5 MPa or more, the allowable pressure in the chamber space 6a is 100 kPa or more, and no rupture occurs due to an increase in internal pressure due to a pedestrian collision. Moreover, since the chamber member 6 is made of a material having a tensile elongation at break of 300% or more, no cracking occurs due to the crushing deformation at the time of a pedestrian collision. Accordingly, the collision detection performance can be exhibited without causing the chamber member 6 to be damaged due to deformation caused by a pedestrian collision or an increase in internal pressure.

また、チャンバ部材６の材料が低密度ポリエチレンであるので、耐環境性に優れ軟質であり且つ強度にも優れている。特に、低密度ポリエチレンのメルトマスフローレートが０．５〜２．０ｇ／１０ｍｉｎであるので、ブロー成型によって袋状のチャンバ部材６を容易に製造することができる。   Moreover, since the material of the chamber member 6 is low density polyethylene, it is excellent in environmental resistance and is soft and excellent in strength. In particular, since the melt mass flow rate of low density polyethylene is 0.5 to 2.0 g / 10 min, the bag-shaped chamber member 6 can be easily manufactured by blow molding.

また、チャンバ部材６の材料は、ピカット軟化温度が９０℃以上であるので、歩行者衝突検知装置Ｓの使用環境温度（−３０℃〜８０℃）における耐高温環境性能を満足している。さらに、チャンバ部材６の材料は、脆化温度が−４５℃以下であるので、歩行者衝突検知装置Ｓの使用環境温度（−３０℃〜８０℃）における耐低温環境性能を満足している。   Moreover, since the material of the chamber member 6 has a Picat softening temperature of 90 ° C. or higher, it satisfies the high temperature resistance environmental performance at the use environment temperature (−30 ° C. to 80 ° C.) of the pedestrian collision detection device S. Furthermore, since the material of the chamber member 6 has an embrittlement temperature of −45 ° C. or lower, it satisfies the low temperature resistance environmental performance at the use environment temperature (−30 ° C. to 80 ° C.) of the pedestrian collision detection device S.

尚、本発明は上述した実施の形態に限定されるものではなく、本発明の主旨を逸脱しない範囲で種々の変更を施すことが可能であることは云うまでもない。   Needless to say, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

例えば、上記実施形態では、バンパ２内でアブソーバ５の上方にチャンバ部材６を配置した例を示したが、これには限られない。例えば、アブソーバ５とチャンバ部材６とをバンパレインフォースメント４よりも前方で略同一高さに配置し且つアブソーバ５とバンパレインフォースメント４との間にチャンバ部材６を配置する構成としてもよい。   For example, in the above-described embodiment, the example in which the chamber member 6 is disposed above the absorber 5 in the bumper 2 has been described, but the present invention is not limited thereto. For example, the absorber 5 and the chamber member 6 may be arranged at substantially the same height in front of the bumper reinforcement 4 and the chamber member 6 may be arranged between the absorber 5 and the bumper reinforcement 4.

本発明は、チャンバ部材を有する圧力式の歩行者衝突検知装置において歩行者衝突時の変形や内圧上昇によってチャンバ部材に破損が生じない構成とするために利用可能である。   INDUSTRIAL APPLICABILITY The present invention can be used for a pressure-type pedestrian collision detection device having a chamber member so that the chamber member is not damaged due to deformation or an increase in internal pressure during a pedestrian collision.

本発明の一実施形態の歩行者衝突検知装置を搭載した車両のバンパ付近を透視して示す模式平面図である。1 is a schematic plan view showing a portion near a bumper of a vehicle on which a pedestrian collision detection device according to an embodiment of the present invention is mounted. 図１におけるバンパのＡ−Ａ線断面図である。FIG. 2 is a cross-sectional view of the bumper in FIG. チャンバ潰れピーク荷重と曲げ弾性率との関係を示すグラフである。It is a graph which shows the relationship between a chamber collapse peak load and a bending elastic modulus. チャンバ内許容圧力と引張降伏応力との関係を示すグラフである。It is a graph which shows the relationship between the allowable pressure in a chamber, and a tensile yield stress. 引張破断伸びとチャンバ部材の衝突試験の結果との関係を示す図である。It is a figure which shows the relationship between the tensile breaking elongation and the result of the collision test of a chamber member. 歩行者衝突検知装置のシステム構成を示すブロック図である。It is a block diagram which shows the system configuration | structure of a pedestrian collision detection apparatus.

符号の説明Explanation of symbols

Ｓ 歩行者衝突検知装置
２ バンパ
３ サイドメンバ
４ バンパレインフォースメント
６ チャンバ部材
６ａ チャンバ空間
７ 圧力センサ S Pedestrian collision detection device 2 Bumper 3 Side member 4 Bumper reinforcement 6 Chamber member 6a Chamber space 7 Pressure sensor

Claims (6)

車両のバンパ内でサイドメンバに固定されるバンパレインフォースメントより前方に配置され、略密閉されたチャンバ空間を区画するチャンバ部材と、前記チャンバ空間の圧力を検出する圧力センサとを有し、前記チャンバ空間内の圧力の変動から前記車両と歩行者との衝突を検知する歩行者衝突検知装置であって、
前記チャンバ部材は、曲げ弾性率が５００ＭＰａ以下であり、且つ引張降伏応力が５ＭＰａ以上であり、且つ引張破断伸びが３００％以上である材料からなることを特徴とする歩行者衝突検知装置。 A chamber member that is disposed in front of a bumper reinforcement fixed to a side member in a bumper of the vehicle and that defines a substantially sealed chamber space; and a pressure sensor that detects a pressure in the chamber space, A pedestrian collision detection device for detecting a collision between the vehicle and a pedestrian from a change in pressure in a chamber space,
The pedestrian collision detection device, wherein the chamber member is made of a material having a flexural modulus of 500 MPa or less, a tensile yield stress of 5 MPa or more, and a tensile breaking elongation of 300% or more. 前記チャンバ部材の材料は、低密度ポリエチレンであることを特徴とする請求項１に記載の歩行者衝突検知装置。   The pedestrian collision detection device according to claim 1, wherein a material of the chamber member is low density polyethylene. 前記チャンバ部材の材料は、メルトマスフローレートが０．５〜２．０ｇ／１０ｍｉｎであることを特徴とする請求項１又は２に記載の歩行者衝突検知装置。   3. The pedestrian collision detection apparatus according to claim 1, wherein the material of the chamber member has a melt mass flow rate of 0.5 to 2.0 g / 10 min. 前記チャンバ部材は、樹脂材料をブロー成型したものであることを特徴とする請求項１乃至３のいずれか１つに記載の歩行者衝突検知装置。   The pedestrian collision detection device according to any one of claims 1 to 3, wherein the chamber member is formed by blow molding a resin material. 前記チャンバ部材の材料は、ピカット軟化温度が９０℃以上であることを特徴とする請求項１乃至４のいずれか１つに記載の歩行者衝突検知装置。   The pedestrian collision detection device according to any one of claims 1 to 4, wherein the material of the chamber member has a Picat softening temperature of 90 ° C or higher. 前記チャンバ部材の材料は、脆化温度が−４５℃以下であることを特徴とする請求項１乃至５のいずれか１つに記載の歩行者衝突検知装置。   The pedestrian collision detection device according to any one of claims 1 to 5, wherein the material of the chamber member has an embrittlement temperature of -45 ° C or lower.
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