DE2846371A1 - Vehicle collision safety systems actuator - uses two glued oscillating, oppositely-polarised piezoceramic wafers mounted on circuit board, reacting to acceleration change - Google Patents
Vehicle collision safety systems actuator - uses two glued oscillating, oppositely-polarised piezoceramic wafers mounted on circuit board, reacting to acceleration changeInfo
- Publication number
- DE2846371A1 DE2846371A1 DE19782846371 DE2846371A DE2846371A1 DE 2846371 A1 DE2846371 A1 DE 2846371A1 DE 19782846371 DE19782846371 DE 19782846371 DE 2846371 A DE2846371 A DE 2846371A DE 2846371 A1 DE2846371 A1 DE 2846371A1
- Authority
- DE
- Germany
- Prior art keywords
- circuit board
- oppositely
- polarised
- glued
- oscillating
- 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.)
- Ceased
Links
- 230000001133 acceleration Effects 0.000 title claims abstract description 10
- 235000012431 wafers Nutrition 0.000 title 1
- 238000005538 encapsulation Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 2
- 230000007246 mechanism Effects 0.000 abstract 2
- 239000000919 ceramic Substances 0.000 abstract 1
- 239000004020 conductor Substances 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/09—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by piezoelectric pick-up
- G01P15/0922—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by piezoelectric pick-up of the bending or flexing mode type
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Air Bags (AREA)
Abstract
Description
Beschleunigungsaufnehmer zum Auslösen vonAccelerometer to trigger
Sicherheitseinrichtungen Stand der Technik Die Erfindung geht aus von einem Beschleunigungsgeber nach der Gattung des Hautpanspruchs. Aus der DE-OS 22 07 831 ist schon ein Beschleunigungsaufnehmer bekannt, der eine Piezotablette aufweist, die mit Mitteln zum Vorspannen, z.B. Tellerfedern über eine Schlägmasse vorspannbar ist.State of the art safety devices The invention is based from an accelerator according to the genus of the main claim. From the DE-OS 22 07 831 an accelerometer is already known, which is a piezo tablet with means for pretensioning, e.g. disc springs via a whipping mass can be prestressed.
Diese Anordnung hat den Nachteil, daß ein großer mechanischer Aufwand nötig ist und daß der Beschleunigungsaufnehmer eine hohe Querempfindlichkeit aufweist.This arrangement has the disadvantage that a great mechanical effort is necessary and that the accelerometer has a high cross-sensitivity.
Vorteile der Erfindung Der erfindungsgemäße Beschleunigungsaufnehmer mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß er einfach und kompakt aufgebaut ist und auch im rauhen Betrieb eines Kraftfahrzeuges sicher und zuverlässig arbeitet. Als weiterer Vorteil ist anzusehen, daß der Biegeschwinger die für die vorgesehene Anwendung wichtige niedrige Querbeschleunigungsempfindlichkeit aufweist.Advantages of the Invention The accelerometer according to the invention with the characterizing features of the main claim has the advantage over this that it is simple and compact and also in the rough operation of a motor vehicle works safely and reliably. Another advantage is that the flexural oscillator the low lateral acceleration sensitivity, which is important for the intended application having.
Zeichnungen Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und der nachfolgenden Beschreibung näher erläutert. Es zeigen Fig. 1 und 2 verschiedene Spannarten des piezoelektrischen Elementes.Drawings An embodiment of the invention is shown in the drawing and explained in more detail in the following description. 1 shows and 2 different types of tensioning of the piezoelectric element.
Beschreibung des Ausführungsbeispiels In Fig. 1 ist ein als Biegeschwinger ausgebildetes piezoelektrisches Element 1 dargestellt, das einseitig mit einer Spannvorrichtung 2 auf eine als Unterlage dienende Leiterplatte 3 gepreßt wird und dadurch fest eingespannt ist. Das piezoelektrische Element 1 weist zwei gegensinnig polarisierte Scheiben 4 und 5 auf, die miteinander verklebt sind. Wird das piezoelektrische Element 1 im Wechsel Zug- und Druckspannungen bzw. Biege spannungen, in den beiden miteinander verklebten Streifen 4 und 5 ausgesetzt, so kann an der Oberseite 4 und Unterseite 5 ein elektrisches Signal abgegriffen werden. Die Unterseite 5 ist direkt auf eine Leiterbahn 6 gepreßt, während des elektrische Signal, das die Oberseite 4 abgibt, über die Spannvorrichtung 2 auf die Leiterbahn 7 geleitet wird. Wegen der gegensinnigen Polarisation der beiden Plättchen 4 und 5 entstehen an den Ab griffen gleichsinnige und sich daher addierende Spannungssignale.DESCRIPTION OF THE EXEMPLARY EMBODIMENT In Fig. 1 is a flexural oscillator formed piezoelectric element 1 shown, the one-sided with a clamping device 2 is pressed onto a printed circuit board 3 serving as a base and thereby firmly clamped is. The piezoelectric element 1 has two oppositely polarized disks 4 and 5, which are glued together. If the piezoelectric element 1 alternating tensile and compressive stresses or bending stresses, in the two together glued strips 4 and 5 exposed, so can on the top 4 and bottom 5 an electrical signal can be tapped. The bottom 5 is right on one Conductor 6 pressed, during the electrical signal that the top 4 emits, is passed via the clamping device 2 onto the conductor track 7. Because of the opposing Polarization of the two plates 4 and 5 arise at the tap voltage signals in the same direction and therefore adding up.
Die entstandenen hochohmigen Signale werden über die Leiterbahnen 6 und 7 einem Ladungsverstärker zugeführt, durch den ein niederohmiges, der Beschleunigung proportionales Spannungssignal entsteht. Ebenso wie das piezoelektrische Element ist der Ladungsverstärker auf der Leiterpiatte 3 untergebracht.The resulting high-resistance signals are transmitted via the conductor tracks 6 and 7 are fed to a charge amplifier through which a low-resistance, the acceleration proportional voltage signal arises. Just like the piezoelectric element the charge amplifier is housed on the printed circuit board 3.
Ein weiteres Ausführungsbeispiel des Biegeschwingers ist in Fig. 2 dargestellt. Das piezoelektrische Element 1 ist hier zwischen zwei Einspannklötze 8, 9 aus Isolierstoff gespannt. Die Lötanschlüsse zum Abnehmen der elektrischen Signale befinden sich innerhalb der Einspannung Da der Beschleunigungsaufnehmer gegen Feuchtigkeit empfindlich ist, empfiehlt es sich, die Einrichtung einzukapseln.A further exemplary embodiment of the flexural oscillator is shown in FIG. 2 shown. The piezoelectric element 1 is here between two clamping blocks 8, 9 stretched from insulating material. The soldered connections for removing the electrical Signals are within the clamping Da of the accelerometer If you are sensitive to moisture, it is best to encapsulate the device.
Das Auslösen der Sicherheitseinrichtungen, wie z.B.The triggering of the safety devices, e.g.
eines Luftkissens, soll nur in dem Fall erfolgen, wenn das Fahrzeug in Fahrtrichtung auf ein Hindernis trifft, da im Falle einer seitlichen Kollision das Luftkissen keinen Schutz bietet. Daher müssen unerwünschte Signale durch Scherkräfte bei Querbeschleunigungen unterbunden werden. Der erfindungsgemäße Beschleunigugsaufnehmer weist wegen seiner vorteilhaften Konstruktion eine niedrige Querbeschleunigungsempfindlichkeit auf.an air cushion, should only be done in the case when the vehicle encounters an obstacle in the direction of travel, in the event of a side collision the air cushion does not offer any protection. Therefore, unwanted signals must be caused by shear forces are prevented in the event of lateral acceleration. The accelerometer according to the invention Due to its advantageous construction, it has a low sensitivity to lateral acceleration on.
Der Frequenzgang des Beschleunigungsaufnehmers ist im Frequenzbereich von 10 Hz bis 1 KHz ungefähr konstant.The frequency response of the accelerometer is in the frequency domain approximately constant from 10 Hz to 1 KHz.
Für die Auslösung von Luftkissen genügt grundsätzlich ein Beschlenigungsaufnehmer mit einer Bandbreite von 10 ... 200 Hz. Da hochfrequente Verzögerungswerte am Beginn eines Aufprallvorganges vorhanden sind, ist es möglich, eine frühere Auslösung des Luftkissens durch einen breitbandigen Beschleunigungsaufnehmer zu erreichen. Auch bei Gurtstrammersystemen ist ein Beschleunigungsaufnehmer mit großer Bandbreite erwünscht, da hier höherfrequente Verzögerungen erfaßt werden sollen.Basically, it is sufficient to trigger air cushions a Acceleration sensors with a bandwidth of 10 ... 200 Hz. As high-frequency Deceleration values are available at the beginning of an impact process, it is possible an earlier release of the air cushion by a broadband accelerometer to reach. An accelerometer is also included with belt tensioner systems A large bandwidth is desirable, since higher-frequency delays are recorded here should.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19782846371 DE2846371A1 (en) | 1978-10-25 | 1978-10-25 | Vehicle collision safety systems actuator - uses two glued oscillating, oppositely-polarised piezoceramic wafers mounted on circuit board, reacting to acceleration change |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19782846371 DE2846371A1 (en) | 1978-10-25 | 1978-10-25 | Vehicle collision safety systems actuator - uses two glued oscillating, oppositely-polarised piezoceramic wafers mounted on circuit board, reacting to acceleration change |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2846371A1 true DE2846371A1 (en) | 1980-05-08 |
Family
ID=6053043
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19782846371 Ceased DE2846371A1 (en) | 1978-10-25 | 1978-10-25 | Vehicle collision safety systems actuator - uses two glued oscillating, oppositely-polarised piezoceramic wafers mounted on circuit board, reacting to acceleration change |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2846371A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3814950A1 (en) * | 1988-05-03 | 1989-11-16 | Bosch Gmbh Robert | ACCELERATOR |
EP0476356A1 (en) * | 1990-09-19 | 1992-03-25 | Bayerische Motoren Werke Aktiengesellschaft | Seat occupation switching device for automotive vehicles |
FR2723641A1 (en) * | 1994-08-09 | 1996-02-16 | Bosch Gmbh Robert | ACCELERATION DETECTOR MOUNTED IN MOTOR VEHICLES FOR KNOWING ACCELERATION FORCES EXECUTING THE VEHICLE BY GENERATING A CONTROL SIGNAL |
DE4440078A1 (en) * | 1994-11-10 | 1996-05-15 | Telefunken Microelectron | Piezoelectric accelerometer |
DE19525147A1 (en) * | 1995-07-11 | 1997-01-16 | Telefunken Microelectron | Piezoelectric acceleration sensor e.g. for motor vehicle airbag release during collision - consists of combination of two in opposite polarisation w.r.t. each other layered and electrically and mechanically connected bending elements, which are formed of piezoelectric material |
DE10108849C2 (en) * | 2000-03-18 | 2002-05-08 | Conti Temic Microelectronic | Method for controlling occupant protection devices in a vehicle |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2207831A1 (en) * | 1972-02-19 | 1973-08-23 | Dynamit Nobel Ag | ELECTRONIC SENSOR FOR TRIGGERING SAFETY DEVICES IN THE EVENT OF A VEHICLE IMPACT |
-
1978
- 1978-10-25 DE DE19782846371 patent/DE2846371A1/en not_active Ceased
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2207831A1 (en) * | 1972-02-19 | 1973-08-23 | Dynamit Nobel Ag | ELECTRONIC SENSOR FOR TRIGGERING SAFETY DEVICES IN THE EVENT OF A VEHICLE IMPACT |
Non-Patent Citations (2)
Title |
---|
DE-Z.: Elektronik, H. 7, 1973, Bd. 22, S. 267-268 * |
DE-Z.: Valvo Berichte Bd. 20, H. 2 April 1977, S. 90-91 * |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3814950A1 (en) * | 1988-05-03 | 1989-11-16 | Bosch Gmbh Robert | ACCELERATOR |
EP0476356A1 (en) * | 1990-09-19 | 1992-03-25 | Bayerische Motoren Werke Aktiengesellschaft | Seat occupation switching device for automotive vehicles |
FR2723641A1 (en) * | 1994-08-09 | 1996-02-16 | Bosch Gmbh Robert | ACCELERATION DETECTOR MOUNTED IN MOTOR VEHICLES FOR KNOWING ACCELERATION FORCES EXECUTING THE VEHICLE BY GENERATING A CONTROL SIGNAL |
WO1996005515A1 (en) * | 1994-08-09 | 1996-02-22 | Robert Bosch Gmbh | Acceleration sensor |
DE4440078A1 (en) * | 1994-11-10 | 1996-05-15 | Telefunken Microelectron | Piezoelectric accelerometer |
US5631421A (en) * | 1994-11-10 | 1997-05-20 | Temic Telefunken Microelectronic Gmbh | Piezoelectric acceleration transducer |
EP0712005A3 (en) * | 1994-11-10 | 1998-08-12 | TEMIC TELEFUNKEN microelectronic GmbH | Piezoelectric acceleration sensor |
DE19525147A1 (en) * | 1995-07-11 | 1997-01-16 | Telefunken Microelectron | Piezoelectric acceleration sensor e.g. for motor vehicle airbag release during collision - consists of combination of two in opposite polarisation w.r.t. each other layered and electrically and mechanically connected bending elements, which are formed of piezoelectric material |
DE19525147C2 (en) * | 1995-07-11 | 1998-08-13 | Telefunken Microelectron | Piezoelectric bending sensor, especially a series bimorph sensor |
DE10108849C2 (en) * | 2000-03-18 | 2002-05-08 | Conti Temic Microelectronic | Method for controlling occupant protection devices in a vehicle |
DE10108850C2 (en) * | 2000-03-18 | 2002-05-08 | Conti Temic Microelectronic | Method for controlling occupant protection devices in a vehicle |
DE10108848C2 (en) * | 2000-03-18 | 2002-05-16 | Conti Temic Microelectronic | Method for controlling occupant protection devices in a vehicle |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8110 | Request for examination paragraph 44 | ||
8131 | Rejection |