EP0360843B1 - Detecteur d'impacts - Google Patents

Detecteur d'impacts Download PDF

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Publication number
EP0360843B1
EP0360843B1 EP89900815A EP89900815A EP0360843B1 EP 0360843 B1 EP0360843 B1 EP 0360843B1 EP 89900815 A EP89900815 A EP 89900815A EP 89900815 A EP89900815 A EP 89900815A EP 0360843 B1 EP0360843 B1 EP 0360843B1
Authority
EP
European Patent Office
Prior art keywords
magnetic
magnet
impact sensor
sensor according
movable mass
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.)
Expired - Lifetime
Application number
EP89900815A
Other languages
German (de)
English (en)
Other versions
EP0360843A1 (fr
Inventor
Hans Spies
Alfons Wöhrl
Horst Laucht
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.)
Airbus Defence and Space GmbH
Original Assignee
Messerschmitt Bolkow Blohm 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 Messerschmitt Bolkow Blohm AG filed Critical Messerschmitt Bolkow Blohm AG
Priority to AT89900815T priority Critical patent/ATE77001T1/de
Publication of EP0360843A1 publication Critical patent/EP0360843A1/fr
Application granted granted Critical
Publication of EP0360843B1 publication Critical patent/EP0360843B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/14—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch
    • H01H35/147—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch the switch being of the reed switch type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/14—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch
    • H01H35/145—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch operated by a particular acceleration-time function

Definitions

  • the invention relates to an impact sensor that can be used in particular for safety devices in motor vehicles.
  • An acceleration sensor is e.g. described in DE 21 58 800 B2.
  • a ball which is attracted to a permanent magnet in the rest position, is moved away from it by overcoming the attraction force and triggers a switching process.
  • the disadvantage here is that the switch is a microswitch with an actuating plunger loaded by spring force.
  • the object of the invention is to provide an impact sensor for safety devices, which is also difficult to use and Switching conditions works exactly according to the design characteristics and this over a long service life.
  • Fig. 1d shows a modification to Fig. 1b including gravity to reset the ball in addition to the magnetic force and for all-round characteristics.
  • the impact sensor consists of a permanent magnet and two parallel soft magnetic circuits with different magnetic resistance.
  • the circuit with the lower magnetic resistance is closed with a ball exposed to the inertial force.
  • the ball moves from its starting position.
  • the magnetic resistance rises sharply. This increases the magnetic voltage and the reed relay located in the circuit with higher magnetic resistance as a magnetically operable insert. Switch, thereby switches over or on. If the effect of the external force ceases, the ball is pulled back into the starting position by the magnetic field. The reed relay returns to the original switching position.
  • the response characteristic can be designed, such as, for example, a circular section (xy-plane design) or an elliptical section (also possible or required in the z-direction design) .
  • the response threshold, the response sensitivity and the duty cycle can be largely adapted to the desired values due to the design.
  • the electrical contact with the help of a reed relay ensures high reliability, for example in the triggering circuit of an airbag system, a belt tensioner or similar known safety systems.
  • the sensor has a ferromagnetic mass 2, e.g. in spherical shape in its interior or free space 10.
  • the housing has an upper ferromagnetic sheet metal part 3 and a lower ferrromagnetic sheet metal part 4.
  • the reed switch is arranged in the electrically and magnetically non-conductive housing part 6.
  • the characteristic curve in particular of the magnetic forces acting on the ball 2, can be largely freely designed by shaping the free space in the housing.
  • the shape of the housing wall, which surrounds the free space 10, also determines the movement path limits of the ball 2 from the rest position 2 'on the magnet seat 1 facing the rest seat 7' into the switch position 2 "facing the reed switch 5 and its contact tongue (see FIG. 1c).
  • the magnetic conductivity of the magnetic circuit 1-3-2-4 is symbolically represented with 8 and with 9 the magnetic conductivity of the magnetic circuit 1-3-3'-5-4'-4.
  • the magnetic yoke plates 3 'and 4' in Fig. 1b are arranged exactly one behind the other, i.e. in this view, the yoke plate 4 'covers the yoke plate 3'. Both together hold the reed switch 5 in a cutout, in particular its glass jacket tube 11, which tapers at the ends with the connections 12.
  • Fig. 1d shows a modification in which the magnet 1 as in Fig. 1b is adjacent to the seat (cone) of the ball 2 and normally holds it. However, in Fig. 1d the magnet is arranged at a distance between the resting seat for the ball 2 and the reed switch 5. In addition to the magnetic return force, gravity also acts as a restoring force for the ball in the starting position (if the position is relative to the gravitational field). 1d shows the embodiment for an all-round characteristic.

Landscapes

  • Switches Operated By Changes In Physical Conditions (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Air Bags (AREA)

Claims (7)

1. Détecteur de collision, en particulier pour des dispositifs de sécurité dans des véhicules automobiles, comportant un contacteur (5) magnétique réagissant à l'accélération et au freinage, une masse (2) mobile dotée d'une inertie, qui est ramenée à sa position de repos par un aimant (1), caractérisé en ce qu'il comporte deux circuits magnétiques à résistance magnétique variable branchés en parallèle et alimentés par l'aimant (1), pami lesquels
le premier circuit magnétique est constitué de l'aimant (1), des éléments (3, 4) conducteurs du flux magnétique et de la masse mobile (2) et est fermé en position de repos, et
le second circuit magnétique est constitué de l'aimant (1), des éléments (3, 3′, 4, 4′) conducteurs du flux magnétique et du contacteur (5) à commande magnétique qui réagit lorsque la tension magnétique à l'intérieur de ce second circuit magnétique, influencée par les variations à l'intérieur du premier circuit magnétique atteint une valeur prédéterminée.
2. Détecteur de collision selon la revendication 1, caractérisé en ce qu'un espace de déplacement (10) donné est attribué à la masse mobile (2) par conformation particulière de sa trajectoire dans au moins un plan (plan X-Y, plan Z), de manière à obtenir une caractéristique de réponse souhaitée.
3. Détecteur de collision selon la revendication 1 ou 2, caractérisé en ce que - sous l'action d'une accélération ou d'un freinage en tant que force extérieure - la masse (2) mobile s'éloigne jusqu'à une distance prédéterminée de sa position de repos à l'encontre de l'action de l'aimant (1) le long de sa trajectoire de déplacement adaptée et - dès que l'action de la force extérieure cesse - la masse (2) mobile est ramenée à sa position de repos sous l'action de l'aimant (1) le long de sa trajectoire de déplacement adaptée.
4. Détecteur de collision selon la revendication 3, caractérisé en ce qu'on utilise en outre la pesanteur comme force agissant dans le sens de rappel sur la nasse mobile (2).
5. Détecteur de collision selon la revendication 1, caractérisé en ce qu'un élément (9) placé dans le second circuit magnétique (1, 3, 3′, 5, 4, 4′) que peut influencer la masse (2) dotée d'une inertie par interruption du flux magnétique à l'intérieur du premier circuit magnétique (1, 2, 3, 4) et dont la résistance magnétique peut être stimulée de l'extérieur, permet le contrôle du bon fonctionnement du détecteur de collision.
7. Détecteur de collision selon la revendication 6, caractérisé en ce que, lors du contrôle du fonctionnenent,un courant est envoyé dans une bobine (13) qui entoure le contacteur (5) à contact de Reed.
EP89900815A 1988-02-09 1988-12-15 Detecteur d'impacts Expired - Lifetime EP0360843B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89900815T ATE77001T1 (de) 1988-02-09 1988-12-15 Aufprallsensor.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3803914 1988-02-09
DE3803914A DE3803914A1 (de) 1988-02-09 1988-02-09 Aufprallsensor

Publications (2)

Publication Number Publication Date
EP0360843A1 EP0360843A1 (fr) 1990-04-04
EP0360843B1 true EP0360843B1 (fr) 1992-06-03

Family

ID=6346990

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89900815A Expired - Lifetime EP0360843B1 (fr) 1988-02-09 1988-12-15 Detecteur d'impacts

Country Status (6)

Country Link
US (1) US5028750A (fr)
EP (1) EP0360843B1 (fr)
JP (1) JPH02503727A (fr)
AT (1) ATE77001T1 (fr)
DE (2) DE3803914A1 (fr)
WO (1) WO1989007830A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5248861A (en) * 1989-08-11 1993-09-28 Tdk Corporation Acceleration sensor
DE9013474U1 (de) * 1990-09-25 1990-11-29 W. Günther GmbH, 90431 Nürnberg Beschleunigungs-Sensor mit wenigstens einem magnetfeldabhängigen Schaltelement
US5256839A (en) * 1992-03-05 1993-10-26 Shawn Gallagher Tilt switch responsive to acceleration or deceleration
US5675134A (en) * 1992-05-25 1997-10-07 Siemens Aktiengesellschaft Traffic accident detecting sensor for a passenger protection system in a vehicle
DE679276T1 (de) * 1993-01-06 1996-10-10 Image Technology Int Filmloses verfahren und gerät zur herstellung dreidimensionaler photographien.
DE4306488A1 (de) * 1993-03-02 1994-09-08 Autoliv Dev Auslösesystem für Airbags
US5614700A (en) * 1994-10-11 1997-03-25 Automotive Systems Laboratory, Inc. Integrating accelerometer capable of sensing off-axis inputs
DE29619060U1 (de) * 1996-11-02 1998-03-05 Stein, Wolfgang, 63776 Mömbris Vorrichtung zur Erhöhung der Verkehrssicherheit im fließenden Verkehr von Kraftfahrzeugen
US7526120B2 (en) * 2002-09-11 2009-04-28 Canesta, Inc. System and method for providing intelligent airbag deployment
DE102005024796A1 (de) * 2005-05-26 2006-11-30 Oculometrics Ag Verfahren und Vorrichtung zum Bestimmen neurologischer Beeinträchtigungen
US9989382B2 (en) 2015-11-17 2018-06-05 Hamlin Electronics (Suzhou) Co., Ltd. Detecting movement of a seatbelt sensor

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1590743A1 (de) * 1966-09-01 1970-05-21 Adolf Traunbauer Magnetische Verschlusseinrichtung mit Kontakt
US3459911A (en) * 1968-01-16 1969-08-05 Inertia Switch Inc Inertia switch with magnetic shunting
US3601729A (en) * 1969-11-03 1971-08-24 Western Sales Corp Switch assembly
US3743849A (en) * 1970-09-21 1973-07-03 Mitsubadenkiseisakusho Co Ltd Apparatus for automatically disconnecting power circuit for vehicles due to impact
JPS5021617Y1 (fr) * 1970-11-28 1975-06-30
DE2542584A1 (de) * 1975-09-24 1977-04-07 Bosch Gmbh Robert Elektrischer schalter,
DE2829425C3 (de) * 1978-07-05 1981-08-06 Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt e.V., 5000 Köln Vorrichtung zum Messen von Beschleunigungen an schwingenden Körpern
SE426424B (sv) * 1981-07-20 1983-01-17 Hydraul Innovation Ab Lutningskennande kontaktdon
DE3338287C1 (de) * 1983-10-21 1985-05-02 W. Günther GmbH, 8500 Nürnberg Beschleunigungs- und Verzoegerungs-Sensor

Also Published As

Publication number Publication date
ATE77001T1 (de) 1992-06-15
DE3871794D1 (de) 1992-07-09
DE3803914A1 (de) 1989-08-17
US5028750A (en) 1991-07-02
DE3803914C2 (fr) 1990-11-22
JPH02503727A (ja) 1990-11-01
EP0360843A1 (fr) 1990-04-04
WO1989007830A1 (fr) 1989-08-24

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