WO2006131009A1 - Fermeture de ceinture munie d'un capteur d'etat - Google Patents

Fermeture de ceinture munie d'un capteur d'etat Download PDF

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Publication number
WO2006131009A1
WO2006131009A1 PCT/CH2006/000295 CH2006000295W WO2006131009A1 WO 2006131009 A1 WO2006131009 A1 WO 2006131009A1 CH 2006000295 W CH2006000295 W CH 2006000295W WO 2006131009 A1 WO2006131009 A1 WO 2006131009A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
locking
rocker
buckle
buckle according
Prior art date
Application number
PCT/CH2006/000295
Other languages
German (de)
English (en)
Inventor
Henry-J. Schulze
Martin Kirchner
Original Assignee
Polycontact 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 Polycontact Ag filed Critical Polycontact Ag
Publication of WO2006131009A1 publication Critical patent/WO2006131009A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/48—Control systems, alarms, or interlock systems, for the correct application of the belt or harness
    • 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
    • B60R21/015—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 the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B60R21/01544—Passenger detection systems detecting seat belt parameters, e.g. length, tension or height-adjustment
    • B60R21/01546—Passenger detection systems detecting seat belt parameters, e.g. length, tension or height-adjustment using belt buckle sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/48—Control systems, alarms, or interlock systems, for the correct application of the belt or harness
    • B60R2022/4808—Sensing means arrangements therefor
    • B60R2022/4816—Sensing means arrangements therefor for sensing locking of buckle

Definitions

  • the invention relates to a buckle, in particular for a safety belt in an automobile, with a condition sensor according to the preamble of claim 1.
  • the invention also relates to a sensor module, which is designed for installation in a buckle.
  • a very simple electromechanical method is to connect the relatively adjustable component with a mechanical switching element of a circuit. Depending on the end position of the adjustable component of the circuit is open or closed.
  • a belt lock of an automobile can be checked whether, for example, an occupant is belted or not.
  • the knowledge of the state of the buckle is required to alert the occupants by a signal on the donning and closing the seat belts. Since the introduction of safety airbags, the information about the state of the seat belts is also important for controlling the activation or deactivation of mechanisms for inflating driver and passenger airbags or side airbags.
  • Hall sensors are often used for non-contact monitoring of components that change their position, in particular two different end positions can take.
  • Hall sensors basically consist of a constant current supplied semiconductor layer, usually in an integrated design. By a magnetic field component perpendicular to the semiconductor layer of the constant current is influenced and the sensor provides an evaluable Hall voltage, the tapped and used to evaluate a state or can be used directly as a switching voltage.
  • the integrated design of Hall sensors offers the possibility of already having an evaluation circuit suitable for evaluating the switching state on the Hall sensor integrated. In the automotive industry, therefore, Hall sensors are often used as non-contact state sensors for the condition of belt buckles of safety belts.
  • a buckle with an integrated preloaded Hall sensor which erriosst the state of a locking body or an ejector for a inserted into the buckle lock tongue without contact.
  • a Hall sensor is arranged with a Hall field in the immediate vicinity of a permanent magnet.
  • the Hall sensor with a Hall field without a permanent magnet and to form the locking body or the ejector as a permanent magnet. Also in this arrangement, the change in position of the locking body or the ejector should be detectable by a change in the Hall voltage.
  • a disadvantage of the buckle according to EP-AO 861 763 is that the Hall sensor very carefully with respect to the locking element or the ejector he must be positioned. Subsequent installation of the Hall sensor is therefore relatively complicated and expensive. Depending on its arrangement, the Hall sensor is relatively sensitive to external stray electromagnetic fields, which can already be caused for example by a magnetic key fob. If necessary, even an additional shielding has to be applied, which further complicates the construction or the installation. The susceptibility to external stray fields is also increased by the fact that the signal changes due to the relatively short distances that are covered when closing or opening the seat belt locking of the locking body and the ejector, are relatively small.
  • the buckle variant without biased Hall sensor in which either the locking body or the ejector are designed as a permanent magnet, proves to be less practicable.
  • the achievable signal changes are also relatively small here. Due to the vibrations of the locking body and the ejector when closing and Opening the seat belt may cause demagnetization over time. This ultimately leads to the Hall sensor becoming ineffective, and the state changes of the belt buckle can no longer be detected.
  • the object of the present invention is to reduce or avoid these disadvantages of the prior art. It is a buckle to be created with a condition sensor, which is largely insensitive to stray and interference fields. It should be possible a simple and cost-effective attachment or installation, which also favors retrofitting existing buckle systems of different designs.
  • the invention proposes that in the case of a belt buckle, in particular for a safety belt in a motor vehicle, with a locking mechanism arranged in a lock frame and a condition sensor monitoring a component which changes its position during actuation of the locking mechanism, the condition sensor comprises at least one reel whose inductance is variable as a function of the change in position of the monitored component.
  • the inventive solution has a very simple and relatively small design and makes only the variability of the inductance of a coil due to the change in position of the monitored component advantage.
  • the arrangement is insensitive to electromagnetic interference fields or to a faulty magnet, which may have been inserted by the user of the seat belt, for example. Because of the absence of moving mechanical contacts or the like, no mechanical wear occurs.
  • a particularly simple way of detecting a change in the inductance results when the coil is part of an oscillator circuit.
  • Such an oscillator circuit comprises a capacitor and a coil, which are connected in series or in parallel. For the natural frequency of the oscillator circuit applies
  • the natural frequency of the oscillator circuit is proportional to the inverse of the square root of the inductance. If the mduktpatented changed, so does the natural frequency of the oscillator circuit.
  • An expedient variant of the invention provides that the oscillator circuit is connected to an evaluation element.
  • the evaluation element allows, for example, the specification of a threshold value for the oscillation frequency change. If the threshold is exceeded, i. if a minimum change in the oscillation frequency is present, a signal can be generated which indicates the presence of a change in state of the component which can be changed with respect to its position. This signal can be used, for example, to activate or deactivate a warning display or fed to a control unit for the activation of restraint and safety systems.
  • the locking mechanism comprises in a variant of the invention, a rocker as a locking element.
  • the change in position of the rocker in the locking or unlocking of the buckle leads to an inductance change.
  • inductance and permeability follows the relationship
  • 1 stands for the length of the coil
  • N for the number of turns over the coil length
  • A for the cross-sectional area inside the coil.
  • the change in inductance is thus directly proportional to the change in permeability resulting from the product of the permeability ⁇ o for the vacuum and a relative permeability ⁇ r results.
  • Air has a relative permeability ⁇ r of about 1.
  • Iron, for example, has a relative permeability of> 1000.
  • an advantageous embodiment of the invention provides that the rocker has a ferromagnetic locking body whose relative position is monitored with the coil. Depending on the position of the ferromagnetic locking body, for example a locking body made of iron, the coil has a different inductance.
  • the advantage of this embodiment is that no additional components for monitoring the change of state are required. The change in the inductance of the coil is caused directly by that component whose position change is monitored.
  • An embodiment of the invention provides that the locking body in one of its end positions, for example in its locking position, axially partially immersed in the interior of the coil. Based on the above relationship between the inductance of the coil and the permeability, a relative permeability ⁇ r of about 1 means that the lock body is not engaged and the buckle is not closed. A permeability ⁇ r > 1000 means that the locking body has dipped into the coil and a locking of the buckle has occurred.
  • the coil is arranged in the region of a recess of the lock frame, through which the locking body passes during the locking.
  • An alternative embodiment of the buckle may also provide that the coil is arranged in the vicinity of the recess of the lock frame.
  • the locking body does not dive into the coil interior, but affects the magnetic field of the coil in the immediate vicinity of the entrance into the coil interior.
  • the magnetic field strength H still has a largely constant value.
  • the coil is not damaged during the actuation of the rocker, it is advantageously arranged on the side facing away from the rocker side of the lock frame.
  • the order is such that the coil is only reached by the locking element, which passes through the recess in the lock frame.
  • a further embodiment variant of the buckle according to the invention provides that the rocker has a locking body at one longitudinal end and at least one thorn-like ferromagnetic extension at its other longitudinal end.
  • the extension is arranged in close proximity to the coil mounted on the lock frame or he dives slightly into this. When the position change seesaw in the locking position, the extension moves further into the sphere of action of the magnetic field of the coil or immersed the extension further into the coil interior.
  • the locking body is not monitored. Rather, there is a monitoring of the opposite end of the rocker. As a result, the coil is brought spatially further out of the engagement region of the belt of the seat belt, which is introduced for locking in the buckle.
  • the ferromagnetic locking body or the ferromagnetic extension can be mounted on the rocker made of a different material.
  • the rocker is integrally formed and consists of a total of a ferromagnetic material.
  • a sensor module For installation in a buckle or as a retrofit kit for existing buckles proves to be a sensor module that includes at least one coil that is part of an oscillator circuit, which is connected to an evaluation circuit, and is designed as a structural unit.
  • the evaluation circuit and a part of the oscillator circuit as an integrated circuit, in particular ASIC, are formed.
  • the training as an integrated circuit is also largely insensitive to the vibrations occurring in a motor vehicle.
  • Fig. 1 is an overview of a buckle
  • 3 and 4 show two arrangements of a coil of a state sensor according to the invention
  • Fig. 5 is a view along section line V-V in Figure 3;
  • FIG. 6 is a view according to section Un VI-VI in Figure 4.
  • a belt buckle shown schematically in FIG. 1 has an outer structure known per se and is provided with the reference numeral 1 as a whole.
  • the buckle 1 is arranged at the end of a belt anchorage 3 and serves for receiving and releasably locking a belt tongue 20 which is connected to a safety belt 22.
  • the buckle 1 has a housing 2 which is open at its side remote from the belt anchorage 3 side.
  • a release button 5 for a locking mechanism disposed within the housing 2 extends over most of the open housing area and leaves an insertion slot 4 for the belt tongue 20 free.
  • the locking mechanism latches when inserting the belt tongue 20 through the insertion slot 4 in a tongue recess 21.
  • the release of the belt tongue 20 takes place by the actuation of the release button fifth Fig.
  • the reference numeral 6 denotes a lock frame.
  • the substantially U-shaped örmige lock frame 8 has on the lateral legs bearing recesses 8, the lateral supports 11 of a rocker 10 record.
  • a recess 7 is provided, through which a hook-like locking body 12 hin cantrete ⁇ can, which is formed at one end of the rocker 10.
  • the rocker 10 is tiltable in the operation of the locking mechanism between two end positions. The tilting movement is triggered by spring load, not shown.
  • the insertion slot for the belt tongue is indicated at 4.
  • the rocker 10, for example consists entirely of a ferromagnetic material, such as iron.
  • Fig. 3 shows a first arrangement of a coil 13, which is part of a condition sensor for detecting the position of the locking body 12.
  • the coil 13 is arranged on the underside 9 of the lock frame, in the region of the recess 7, that the locking body in the locking through the recess 7 is immersed in the interior of the coil.
  • the connection lines are indicated, via which the coil 13 is coupled to an oscillator circuit with an evaluation element.
  • the coil 13 is arranged on the side facing away from the rocker 10 underside 9 of the lock frame.
  • the dashed lines indicate the position of the locking body 12 in the unlocked state.
  • the solid lines show the locking body 12 in its end position after the lock.
  • the locking body 12 protrudes by a distance ⁇ h in the interior of the coil 13, which is arranged on the underside 9 of the lock frame, and changes their inductance.
  • the coil 13 is arranged in the immediate vicinity of the recess 7 in the lock frame 6 on the underside 9.
  • the effective path that covers the locking body in the largely constant magnetic field of the coil 13 is again denoted by ⁇ h.
  • the inductance of the coil 13 is changed.
  • Fig. 7 shows an alternative embodiment of a rocker 15 for the locking mechanism of the buckle.
  • the rocker 15 is formed similar to the rocker 10 in Figs. 2-6, therefore, the side supports are again denoted by the reference numeral 11 and carries the locking body, the reference numeral 12.
  • the rocker 15 is preferably made entirely of a f erromagnetic material, for example made of iron.
  • the rocker 10 has two spike-like projections 16.
  • FIG. 8 shows an alternative arrangement of the coil 13 of the state sensor, which cooperates with a thorn-like extension 16 of a rocker according to FIG.
  • the coil 13 is arranged on the same side as the rocker 15 in the vicinity of the extension 16. Li the unlocked end position of the rocker 15, the extension protrudes, for example, already slightly into the interior of the coil 13. When the rocker 15 tilts during locking process in its second end position, the extension continues to dive into the interior of the coil 13 and changes their inductance.
  • the coil can also be arranged in analogy to the arrangement in FIGS.
  • both thorn-like projections interact with correspondingly arranged coils.
  • the coil 13 is part of an oscillator circuit 31 with a capacitor 30.
  • the oscillator circuit 13, 30, 31 oscillates with a certain natural frequency, which depends inter alia on the size of the inductance of the coil 13. With a change in the inductance of the coil 13 changes also the natural frequency of the oscillator circuit.
  • the optionally amplified oscillation signal is supplied, for example, to a Schmitt trigger 32.
  • the Schmitt trigger 32 is used to convert the sinusoidal output signal of the oscillator circuit 31 into a square wave, which can be evaluated with respect to the frequency.
  • the evaluation takes place via a monostable multivibrator, a so-called monoflop 33.
  • the monoflop 33 is triggered at the frequency of the oscillator circuit. Since the triggering is done with a constant pulse duration, the resulting mean value changes with the frequency. In the event that the monoflop 33 has no special requirements for the edge steepness of the supplied signal, the Schmitt trigger 32 can also be omitted for converting the sinusoidal signal into a square wave signal. From the values supplied by monoflop 33, for example, a low-cost low-frequency bass 34 is used to form a moving average of the frequency.
  • Another Schmitt trigger 35 serves to generate a binary output signal as a function of the immersion depth of the rocker in the coil 13 or in the effective range of the magnetic field of the coil 13. Instead of a Schmitt trigger, a window discriminator can also be used. The binary signal is used, for example, to activate or deactivate a warning light on the dashboard, can be forwarded to the control unit for the restraint and fall arrest system (belt tensioner, air bag), etc.
  • the circuit arrangement 30 - 35 shown in FIG. 9 is advantageously implemented in integrated construction.
  • an ASIC module may have the required functional elements.
  • the circuit arrangement and the coil 13 are advantageously combined to form a structural unit and form a sensor module that can be installed in the belt buckle.
  • the arrangement of the coil 13 in the structural unit depends on the embodiment of the interaction of the coil and the component to be monitored.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Buckles (AREA)

Abstract

L'invention concerne une fermeture de ceinture comprenant un mécanisme de verrouillage monté dans un bâti de serrure (6) et un capteur d'état pour surveiller un élément (12) qui modifie sa position lorsque le mécanisme de verrouillage est actionné. Le capteur d'état présente au moins une bobine (13) dont l'inductance peut être modifiée par le changement de position de l'élément (12) surveillé.
PCT/CH2006/000295 2005-06-06 2006-06-01 Fermeture de ceinture munie d'un capteur d'etat WO2006131009A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH9452005 2005-06-06
CH945/05 2005-06-06

Publications (1)

Publication Number Publication Date
WO2006131009A1 true WO2006131009A1 (fr) 2006-12-14

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ID=36790988

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH2006/000295 WO2006131009A1 (fr) 2005-06-06 2006-06-01 Fermeture de ceinture munie d'un capteur d'etat

Country Status (1)

Country Link
WO (1) WO2006131009A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016223940A1 (de) 2016-12-01 2018-06-07 Autoliv Development Ab Gurtschloss für eine Sicherheitsgurteinrichtung
DE102022104479A1 (de) 2021-03-05 2022-09-08 Illinois Tool Works Inc. Gurtschlosssystem und Verfahren zur Detektion einer Schlosszunge in einem Gurtschloss
WO2022187298A1 (fr) 2021-03-05 2022-09-09 Illinois Tool Works Inc. Système de boucle de ceinture de sécurité et procédé de détection d'un verrou dans une boucle de ceinture de sécurité

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0861763A2 (fr) 1997-02-13 1998-09-02 Trw Vehicle Safety Systems Inc. Boucle de ceinture de sécurité avec indicateur de bouclage à effet Hall et méthode d'utilisation
EP0939011A1 (fr) * 1998-02-27 1999-09-01 Automobiles Peugeot Système de sécurité pour siège de véhicule automobile
US6184785B1 (en) * 1999-01-21 2001-02-06 Nsk Ltd. Seatbelt device
US20030122361A1 (en) * 2002-01-03 2003-07-03 Kaltenbacher Phillip E. Seat restraint tension sensing assembly
DE10342554A1 (de) * 2003-09-15 2005-04-14 Siemens Ag Vorrichtung und Verfahren zum Erkennen der Position und der Gewichtskraft einer Person

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0861763A2 (fr) 1997-02-13 1998-09-02 Trw Vehicle Safety Systems Inc. Boucle de ceinture de sécurité avec indicateur de bouclage à effet Hall et méthode d'utilisation
EP0939011A1 (fr) * 1998-02-27 1999-09-01 Automobiles Peugeot Système de sécurité pour siège de véhicule automobile
US6184785B1 (en) * 1999-01-21 2001-02-06 Nsk Ltd. Seatbelt device
US20030122361A1 (en) * 2002-01-03 2003-07-03 Kaltenbacher Phillip E. Seat restraint tension sensing assembly
DE10342554A1 (de) * 2003-09-15 2005-04-14 Siemens Ag Vorrichtung und Verfahren zum Erkennen der Position und der Gewichtskraft einer Person

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016223940A1 (de) 2016-12-01 2018-06-07 Autoliv Development Ab Gurtschloss für eine Sicherheitsgurteinrichtung
WO2018099792A1 (fr) 2016-12-01 2018-06-07 Autoliv Development Ab Boucle de ceinture pour un dispositif formant ceinture de sécurité
DE102022104479A1 (de) 2021-03-05 2022-09-08 Illinois Tool Works Inc. Gurtschlosssystem und Verfahren zur Detektion einer Schlosszunge in einem Gurtschloss
WO2022187298A1 (fr) 2021-03-05 2022-09-09 Illinois Tool Works Inc. Système de boucle de ceinture de sécurité et procédé de détection d'un verrou dans une boucle de ceinture de sécurité

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