EP0360843A1 - Aufprallsensor. - Google Patents
Aufprallsensor.Info
- Publication number
- EP0360843A1 EP0360843A1 EP89900815A EP89900815A EP0360843A1 EP 0360843 A1 EP0360843 A1 EP 0360843A1 EP 89900815 A EP89900815 A EP 89900815A EP 89900815 A EP89900815 A EP 89900815A EP 0360843 A1 EP0360843 A1 EP 0360843A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnetic
- impact sensor
- magnetic circuit
- mass
- acceleration
- 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.)
- Granted
Links
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 58800 B2.
- a ball which is attracted by a permanent magnet in the rest position, is moved away from the latter by overcoming the attraction force and triggers a switching process.
- the disadvantage here is that the switch is a Mi ros switch with an actuating plunger loaded by spring force.
- the object of the invention is to provide an impact sensor for safety devices, which works precisely even under difficult application and switching conditions according to the design characteristics and this over a long service life.
- Fig. Lc is a plan view of the clearance for the ball in the housing.
- Fig. Id a modification to Fig. Lb 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 of 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 action 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, in a circular section (xy plane design) or in an elliptical section (also in the z direction) -Design possible or necessary).
- 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 aid 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 In its housing 3, 4, the sensor has a ferromagnetic mass 2, for example in the shape of a sphere in its interior or 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 rest seat 7' facing the magnet 1 into the switching position 2 "facing the reed switch 5 and its contact tongue (see FIG. lc).
- the magnetic conductance of the magnetic circuit 1-3-2-4 is symbolically represented by 8 and the magnetic conductance of the magnetic circuit 1-3-3'-5-4 * -4 by 9.
- 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 in a cutout the reed switch 5, in particular its glass jacket tube 11, which tapers at the ends with the connections 12.
- Fig. Id represents a modification in which the magnet 1 as in Fig. Lb is adjacent to the seat (cone) of the ball 2 and normally holds it. However, in Fig. Id the magnet is arranged in the distance between the seat for the ball 2 and the reed switch 5. In addition to the magnetic return force, gravity also acts here (with the appropriate position relative to the gravitational field) as a restoring force for the ball in the starting position. Furthermore, FIG. 1d shows the embodiment for an all-round characteristic.
Landscapes
- Switches Operated By Changes In Physical Conditions (AREA)
- Air Bags (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Description
Claims
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 |
---|---|---|---|
DE3803914A DE3803914A1 (de) | 1988-02-09 | 1988-02-09 | Aufprallsensor |
DE3803914 | 1988-02-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0360843A1 true EP0360843A1 (de) | 1990-04-04 |
EP0360843B1 EP0360843B1 (de) | 1992-06-03 |
Family
ID=6346990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89900815A Expired - Lifetime EP0360843B1 (de) | 1988-02-09 | 1988-12-15 | Aufprallsensor |
Country Status (6)
Country | Link |
---|---|
US (1) | US5028750A (de) |
EP (1) | EP0360843B1 (de) |
JP (1) | JPH02503727A (de) |
AT (1) | ATE77001T1 (de) |
DE (2) | DE3803914A1 (de) |
WO (1) | WO1989007830A1 (de) |
Families Citing this family (11)
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 |
BR9405650A (pt) * | 1993-01-06 | 1995-11-21 | Image Technology Int | Processo fotográfico direto sem filme de copiar uma imagem tridimensional de um objeto em uma perspectiva continuamente variável sobre material de copiagem lenticulado e aparelho para sua realização |
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)
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 (de) * | 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 |
-
1988
- 1988-02-09 DE DE3803914A patent/DE3803914A1/de active Granted
- 1988-12-15 US US07/427,087 patent/US5028750A/en not_active Expired - Fee Related
- 1988-12-15 DE DE8989900815T patent/DE3871794D1/de not_active Expired - Lifetime
- 1988-12-15 WO PCT/EP1988/001160 patent/WO1989007830A1/de active IP Right Grant
- 1988-12-15 EP EP89900815A patent/EP0360843B1/de not_active Expired - Lifetime
- 1988-12-15 AT AT89900815T patent/ATE77001T1/de not_active IP Right Cessation
- 1988-12-15 JP JP1500733A patent/JPH02503727A/ja active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO8907830A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0360843B1 (de) | 1992-06-03 |
ATE77001T1 (de) | 1992-06-15 |
DE3803914A1 (de) | 1989-08-17 |
US5028750A (en) | 1991-07-02 |
JPH02503727A (ja) | 1990-11-01 |
DE3803914C2 (de) | 1990-11-22 |
WO1989007830A1 (en) | 1989-08-24 |
DE3871794D1 (de) | 1992-07-09 |
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