EP1733197A1 - Systeme de detection de collision sur un vehicule - Google Patents

Systeme de detection de collision sur un vehicule

Info

Publication number
EP1733197A1
EP1733197A1 EP05737947A EP05737947A EP1733197A1 EP 1733197 A1 EP1733197 A1 EP 1733197A1 EP 05737947 A EP05737947 A EP 05737947A EP 05737947 A EP05737947 A EP 05737947A EP 1733197 A1 EP1733197 A1 EP 1733197A1
Authority
EP
European Patent Office
Prior art keywords
impact
measurement volume
vehicle
cross
volume
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.)
Withdrawn
Application number
EP05737947A
Other languages
German (de)
English (en)
Inventor
Gerhard Mader
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.)
Continental Automotive GmbH
Original Assignee
Siemens AG
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
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1733197A1 publication Critical patent/EP1733197A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes

Definitions

  • the invention relates to a device for recognizing a
  • Such a device is known from the publication WO 03/82639 AI. It is known from this to arrange pressure sensors (59) in a cavity (57, 58) behind a part of the outer cladding of a vehicle which serves as a bumper (56 in FIG. 6) and which detects an impacting object, for example a pedestrian, through which Compression of the cavity (57, 58) can detect the resulting pressure rise and can report this to an evaluation unit in the form of a signal.
  • the same publication suggests the use of acceleration sensors, deformation sensors or force sensors, which are also located in the front area near the outer paneling of the vehicle (page 1, paragraph 3) and can detect the impacting object through the vehicle acceleration or deformation of the vehicle body generated in the process.
  • a pedestrian protection device should be triggered, for example.
  • the rear part of the hood of the motor vehicle can be raised, so that the distance between the hood and the engine underneath is increased and the head of the pedestrian hits the hood more gently.
  • Such a sensing device can of course also give an early indication of an impending severe impact to the evaluation unit of an occupant protection system, which then influences, for example, the triggering thresholds of an acceleration sensor that detects the vehicle impact in such a way that an occupant protection means, for example an airbag or the like, is triggered earlier.
  • stiffer parts of the vehicle body along the impact front can lead to the pressure sensors behind the bumper, for example, having different signal amplitudes depending on the location of the impact Pedestrian protection system or forward the occupant protection system.
  • Such body reinforcements can be brought about by the shape of the bumper itself, for example by strongly curved parts of the outer cladding; however, they can also exist due to other structural conditions of the vehicle front, for example due to decorative strips or by attaching a license plate, a tow hook or other accessories.
  • the object of the present invention is to provide a device for detecting an impact on a vehicle which, when the same object hits the same speed, regardless of the location of the impact on the vehicle body, for example the front or rear bumper, has approximately constant signal amplitudes passes on a pedestrian protection system or to an occupant restraint system.
  • the object is achieved by a device according to the invention as claimed in claim 1.
  • the device according to the invention for detecting an impact on a vehicle has a pressure sensor for detecting the compression of a largely closed measurement volume in the event of an impact, the measurement volume along a part of the vehicle body hit by the impact, for example in the part serving as a front or rear bumper
  • the measurement volume has a cross-sectional area along its longitudinal direction, which has a larger area behind those points of the vehicle body where it is comparatively stiff and therefore difficult to deform in the event of an impact.
  • the associated measurement volume is also comparatively larger, the penetration of the impacting object is made more difficult by the stiffer vehicle body, but at the same time a comparatively larger part of the measurement volume is compressed.
  • the larger compressed volume related to the entire measurement volume generates an approximately proportional relative pressure increase relative to the normal pressure in the measurement volume.
  • the relative pressure increase is consequently also greater than in the case of impact areas with smaller cross-sectional areas of the measurement volume.
  • the measurement volume is usually largely complete, which means that there is usually at least a slight pressure equalization of the internal pressure of the measurement volume with the environment. exercise pressure instead.
  • the normal pressure in the measuring volume can optionally be consciously tracked to the ambient pressure even via pressure compensation openings that connect the inside of the measuring volume with the surroundings; however, this usually happens slowly compared to an increase in pressure in the event of an impact.
  • An advantageous development of the invention is characterized, for example, by the fact that the cross-sectional area of the measurement volume has different areas in the longitudinal direction in such a way that in the event of an impact on the same object, that is to say in particular on an impact of an object of the same mass and possibly also of the same shape the same impact speed on different impact locations along the part of the vehicle hit by the impact always causes an almost identical signal amplitude of the pressure sensor.
  • the vehicle body exhibits particularly great resistance to deformation due to an intruding object, there may advantageously be an increase in the cross-sectional areas of the measurement volume and thus an increase in the local measurement volume around the point of impact :
  • the bumpers on vehicles are often mechanically reinforced on both sides of the vehicle by bulges and are consequently very stiff and unyielding. It is advantageous to arrange the largest cross-sectional areas there in comparison to the remaining measurement volume. Is at the same time
  • the bumper in the middle between these two curved sides is particularly flexible, so it may also be advantageous that the measurement volume behind it has a particularly small cross-sectional area.
  • FIG. 1 shows a plan view of a motor vehicle (5) with a front bumper (6) and a device according to the invention with a pressure sensor (3) within a
  • the measurement volume (2) according to the invention drawn with a solid line and a measurement volume (2 X ) drawn according to the broken line according to the prior art
  • FIGS. 2, 3, 4, 5a, 5b advantageous embodiments of the measurement volumes (2) according to the invention
  • FIG. 6 shows a schematic representation of the signal curves (ps) of a pressure sensor (3) for different impact locations (a, b, c) for a measuring volume (2) of the prior art, plotted against time (t)
  • FIG. 7 Signal curves of a pressure sensor signal (ps) for the same impact locations (a, b, c) with a measurement volume (2) according to the invention according to FIG. 3 also plotted against time [t].
  • FIG. 1 shows a motor vehicle 5 with a rear section 51 of a passenger compartment 52 and a front section 53.
  • the front end area of the front section 53 facing away from the passenger compartment 52 forms a bumper 6, which in vehicles of newer types mostly consists of very easily deformable plastic parts which are elegant To complement the external appearance of the motor vehicle.
  • the bumper 6 merges from its foremost boundary surface of the motor vehicle 5 to the sides of the vehicle in a curved manner.
  • a pressure sensor 3 is arranged within two schematically represented measurement volumes 2, 2 ⁇ , the measurement volume 2 shown in broken lines being one over its entire length has a constant cross-sectional area, as is already known from the prior art, while the measurement volume 2 drawn in a solid line according to a development according to the invention has the largest cross-sectional areas at both ends and in the middle in between, at the
  • areas a and c are on the left and right, respectively
  • the pressure sensor 3 is electrically connected to an evaluation unit 4 with a central control unit 4 of an occupant protection system.
  • the pressure sensor 3 In the event of compression of one of the measurement volumes 2 or 2, caused by an object impacting one of the impact areas a, b, c, the pressure sensor 3 detects the pressure rise that arises, converts it into a signal and reports it to the operator using a suitable transmission protocol Central control unit 4. The signal received is evaluated there and the triggering of an occupant protection means is made dependent thereon.
  • the central control unit 4 can also be a control unit 4 of a pedestrian protection system and trigger a pedestrian protection device when a corresponding signal is given, as already described at the beginning.
  • Figure 2 shows the measurement volume 2 * according to the prior art, which is shown in Figure 1 with a solid line, in a schematic perspective view.
  • Associated cross-sectional areas 2A, 2B, 2C are drawn behind the impact areas a, b, c along the measurement volume 2 ⁇ , the area contents of which are ideally identical in each case.
  • the in Pressure sensor 3 mounted in the center of the longitudinal volume in the measuring volume 2 shields the pressure rise caused by volume compression caused by an object penetrating the bumper in the event of an impact.
  • the respective basic course of the signal ps of the pressure sensor 3 for impacts on the three impact areas a, b, c is plotted in FIG. 6 in arbitrary units (digits) against the time t (ms): an impact on the side impact areas a , c generates a signal ps (a, c) which, compared to the signal ps (b), increases both more slowly and has smaller amplitudes due to an impact on the central impact region b.
  • FIG. 2 An embodiment for the measurement volume 2 according to the invention, which is drawn with a solid line in FIG. 1, is shown in FIG.
  • the cross-sectional area 2B behind the impact area b is of the same size in comparison to the measurement volume 2 in FIG.
  • An object hitting here ideally causes the pressure rise to be of the same magnitude as in the case of the measurement volume 2 in FIG. 2.
  • the cross-sectional areas of the measurement volume 2 in FIG. 3 become larger towards its two lateral ends.
  • the cross-sectional areas 2A and 2C behind the impact areas a and c are larger than those in the middle intermediate cross-sectional area 2B behind the impact area b.
  • the same impacting object thus compresses in the impact areas a and c a comparatively larger portion of the total measurement volume 2 than in the case of the measurement volume 2 ⁇ of FIG. 2. This slows down the slower signal rise and the lower signal amplitudes at the pressure sensor 3, which are caused by the mechanical stiffeners in the edge areas a, c of the bumper are counteracted.
  • FIG. 4 shows an alternative embodiment of a measurement volume 2 according to the invention, in which the cross-sectional area of the measurement volume 2 also increases in comparison to the central cross-sectional area 2B in the direction of the two ends of the measurement volume 2:
  • the curvature of the measurement volume 2 shown in FIG. 4 at both ends of the measurement volume 2 is on the one hand in the direction of the vehicle roof and on the other hand in the direction of the vehicle floor.
  • FIG. 5a shows an advantageous embodiment of the invention for an alternative embodiment of the front body part 6 of a motor vehicle 5.
  • the measurement volume 2 has its largest cross-sectional area 2B in the middle between its two ends along the bumper 6, and a continuously decreasing size towards both ends Cross-sectional area, represented schematically by the two lateral cross-sectional areas 2A and 2C.
  • an impacting object can compress a comparatively largest volume in the central impact region b and thereby cause a comparatively largest pressure increase.
  • this can be particularly advantageous if mechanical stiffening can be found in the area of the front vehicle body 6, for example by means of a suspension for a license plate, a tow hook or other design changes on the front vehicle front 6 that make it more difficult for an impacting object to penetrate.
  • FIG. 5b shows a measurement volume 2 which, compared to FIG. 5a, has the largest cross-sectional area 2B off-center between its ends.
  • This embodiment is advantageous in the above context if a reduced signal rise at the pressure sensor 3 is to be counteracted by a mechanical stiffening there, for example by a towing hook attached there, in the event of an impact there.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

L'invention concerne un système permettant de détecter une collision sur un véhicule (5) au moyen d'un capteur de pression (3) servant à détecter la compression d'un volume de mesure (2) sensiblement fermé en cas de collision, ledit volume étant disposé le long d'une pièce de la carrosserie du véhicule concernée par la collision. Selon l'invention, l'aire de section (2A, 2B, 2C) du volume de mesure (2) dans son sens longitudinal présente une superficie comparativement supérieure à proximité de ces pièces de la carrosserie du véhicule, lesdites pièces étant comparativement rigides et par là même difficilement déformables comparativement en cas de collision.
EP05737947A 2004-04-07 2005-04-07 Systeme de detection de collision sur un vehicule Withdrawn EP1733197A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004017270A DE102004017270B3 (de) 2004-04-07 2004-04-07 Vorrichtung zum Erkennen eines Aufpralls auf ein Fahrzeug
PCT/EP2005/051543 WO2005098384A1 (fr) 2004-04-07 2005-04-07 Systeme de detection de collision sur un vehicule

Publications (1)

Publication Number Publication Date
EP1733197A1 true EP1733197A1 (fr) 2006-12-20

Family

ID=34966153

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05737947A Withdrawn EP1733197A1 (fr) 2004-04-07 2005-04-07 Systeme de detection de collision sur un vehicule

Country Status (7)

Country Link
US (1) US7635042B2 (fr)
EP (1) EP1733197A1 (fr)
JP (1) JP2007531888A (fr)
KR (1) KR20070001265A (fr)
CN (1) CN100434887C (fr)
DE (1) DE102004017270B3 (fr)
WO (1) WO2005098384A1 (fr)

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JP2007127537A (ja) * 2005-11-04 2007-05-24 Denso Corp 車両用衝突検知システム
JP4891620B2 (ja) * 2006-01-17 2012-03-07 日立電線株式会社 衝撃検知センサ
JP2007192577A (ja) * 2006-01-17 2007-08-02 Denso Corp 車両用衝突物体判別装置
JP4324172B2 (ja) * 2006-02-15 2009-09-02 トヨタ自動車株式会社 車両用バンパ構造
JP4816187B2 (ja) * 2006-03-27 2011-11-16 株式会社デンソー 衝突検知手段
JP2007290689A (ja) * 2006-03-29 2007-11-08 Denso Corp 衝突検知手段
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Also Published As

Publication number Publication date
US20070181359A1 (en) 2007-08-09
WO2005098384A1 (fr) 2005-10-20
JP2007531888A (ja) 2007-11-08
KR20070001265A (ko) 2007-01-03
CN100434887C (zh) 2008-11-19
DE102004017270B3 (de) 2005-12-01
CN1946994A (zh) 2007-04-11
US7635042B2 (en) 2009-12-22

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