EP1476622A1 - Bobine d'inductance destinee notamment au systeme de fermeture d'une portiere de vehicule - Google Patents

Bobine d'inductance destinee notamment au systeme de fermeture d'une portiere de vehicule

Info

Publication number
EP1476622A1
EP1476622A1 EP03701427A EP03701427A EP1476622A1 EP 1476622 A1 EP1476622 A1 EP 1476622A1 EP 03701427 A EP03701427 A EP 03701427A EP 03701427 A EP03701427 A EP 03701427A EP 1476622 A1 EP1476622 A1 EP 1476622A1
Authority
EP
European Patent Office
Prior art keywords
control circuit
electronic control
ferrite core
circuit according
induction coil
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Withdrawn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
EP03701427A
Other languages
German (de)
English (en)
Inventor
Peter Kull
Fabian Beck
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.)
Schaffner EMV AG
Original Assignee
Schaffner EMV 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 Schaffner EMV AG filed Critical Schaffner EMV AG
Publication of EP1476622A1 publication Critical patent/EP1476622A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B81/00—Power-actuated vehicle locks
    • E05B81/54—Electrical circuits
    • E05B81/64—Monitoring or sensing, e.g. by using switches or sensors
    • E05B81/76—Detection of handle operation; Detection of a user approaching a handle; Electrical switching actions performed by door handles
    • E05B81/78—Detection of handle operation; Detection of a user approaching a handle; Electrical switching actions performed by door handles as part of a hands-free locking or unlocking operation
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B81/00—Power-actuated vehicle locks
    • E05B81/54—Electrical circuits
    • E05B81/64—Monitoring or sensing, e.g. by using switches or sensors
    • E05B81/76—Detection of handle operation; Detection of a user approaching a handle; Electrical switching actions performed by door handles
    • E05B81/77—Detection of handle operation; Detection of a user approaching a handle; Electrical switching actions performed by door handles comprising sensors detecting the presence of the hand of a user

Definitions

  • Induction coil in particular for a vehicle door locking system
  • the present invention relates to an electronic control circuit for a car door locking system and a car door pull handle with such a system.
  • the present invention also relates to a car door pull handle which is provided with a cavity in which an electronic control circuit is housed.
  • a car door locking system is unlocked by means of an electronic control circuit integrated in the car door pull handle, that is, from a state that prevents opening of the door or flap to a state that enables opening of the door or flap.
  • a contactless portable data carrier for example in a chip card or in a key hanger
  • the data query is triggered by a mechanical switching element, or by a proximity sensor, which triggers the forwarding of a data query to the external portable data carrier when a person approaches the handle.
  • the data carrier for example a transponder
  • the control circuit only releases the door when the identification is valid.
  • Proximity sensors using an infrared or ultrasound sensor system are known. They have the disadvantage of being very sensitive to dirt or external noise. Microswitches and pressure sensors have also been used, but they react late (when the user actually touches the handle). This delayed data query and the subsequent reaction time of the unlocking mechanism make such systems uncomfortable. In some cases, this means that the locking system at the first Actuation of the handle is not yet unlocked and the person requesting access has to touch the handle again to unlock the door.
  • WO9741322 describes a system in which at least one electrode is installed in the handles and a counter electrode is attached in the part of the door opposite the handle. An electrical field is built up between the two electrodes, which is used to determine the access request of a person reaching for a handle. As soon as a hand is between the handle and the opposite part of the door, a data request is sent to the external data carrier. To send the data request, an electromagnetic transmitter-receiver with an induction coil is used in this system. The proximity sensor electrodes are formed by the induction coil and / or by the chrome-plated cover of the handles.
  • this system has the disadvantage that it only reacts when a hand comes between the handle and the opposite part of the door, ie only insignificantly before touching the handle.
  • known electronic control circuits for car door locking systems often comprise a transceiver with a resonance circuit, which consists, for example, of an induction coil of a capacitance.
  • the induction coil generates an electromagnetic field that is received by the external data carrier.
  • the desired range is typically around one and a half meters.
  • an inductance of approximately 110 ⁇ H is used.
  • a large coil The thickness available in the handle is very small; a relatively long induction coil can be attached.
  • the resonance frequency of the resonance circuit is stable and well defined.
  • induction coils with precisely defined inductance values are also required.
  • the first and last turns of the antenna wire in the vicinity of the two ends of the ferrite core have a significant influence on the inductance value of the induction coil. It is important that these turns run parallel to the edge of the ferrite core and that there is no unreproducible air gap between the wire and the ferrite core.
  • the turns of the antenna wire often slide over the smooth ferrite core.
  • Another disadvantage is that assembly is made more difficult because the position of the two free ends of the antenna wire is unknown.
  • the diameter of the wire should be less than 0.3 mm, which limits the maximum wire tension to approximately 100 N. This tension is insufficient to ensure a reproducible and stable position of the windings on a very long ferrite core with a rectangular or square cut.
  • an electronic control circuit for a car door locking system which contains the following features: a control unit with at least one induction coil, in order to forward a data query to an external contactless data carrier, and to trigger the unlocking of the car door locking system, if the named A valid response is received on a data carrier, said inductor comprising a ferrite core and a wire wound around the ferrite core, said inductor in a cavity in one
  • Handle of the named Autotur locking system is housed, and wherein at least a portion of the turns of said wire is mechanically connected to the surface of said ferrite core.
  • At least one end of the ferrite core is metallized and the end of the named wire is soldered, welded or glued to this metallized end.
  • Fig. 1 shows the handle of a pull handle and part of a vehicle door in cross section
  • Fig. 2 shows the control circuit shown in perspective
  • Fig. 3 shows the induction coil shown in perspective.
  • FIG. 1 shows a vehicle door pull handle which comprises an inner part 9 fastened to the vehicle door and a handle 7 designed as a bow handle.
  • the handle 7 comprises a handle dome 70 which projects into the interior 90 of the vehicle door with the end facing away from the handle 7 and is connected to the car door locking system, which is not shown for reasons of clarity.
  • the car door locking system is unlocked via the vehicle central locking system in order to free the handle dome 70 and thus the handle 7.
  • the handle 7 can be pulled outwards to open the vehicle door.
  • the handle 7 can be rotated about the joint 71 shown.
  • the door could open automatically after recognition of a valid identification of the person requesting access.
  • the control circuit 1 is connected to the car door locking system inside the vehicle by connecting cables 12. It is preferably powered by these connecting cables from the car battery. In the event of a power failure, the door can preferably be opened by means of a locking cylinder (not shown) with a key provided for such cases.
  • the control circuit comprises a touch sensor 22 which triggers a signal as soon as the user places a finger (in particular a thumb) on the outer side of the handle.
  • a proximity sensor 5 triggers another signal when a hand or another grounded object approaches, particularly in the case of a hand approaching the space between the handle 7 and the inner part of the handle 9.
  • these signals are emitted by one Control unit 20 interpreted with a microcontroller and at least one induction coil 3 in order to forward a data query to an external contactless data carrier, not shown.
  • the control unit 20 preferably determines these small changes in capacitance using a charge transfer measuring system, ie by switching the unknown capacitance with a larger reference capacitance via switches.
  • the data carrier preferably consists of a transponder (which can be integrated, for example, into a chip card or into a key holder) and is "awakened" by this data query. If the data query is addressed to him, he responds with a response that includes an identification of the data carrier or that is signed with such an identification. The response is received by the electronic control unit 20 in the handle 7 in order to trigger the unlocking of the auto door locking system if it contains the expected identification or if it was signed with this expected identification. In a further embodiment, the control unit 20 is only partially embedded in the handle 7.
  • the control circuit 1 is described in more detail in connection with FIG. 2. It comprises a printed circuit board 2 on which all components 20, 21, 22, 3,4,5, 120 are mounted.
  • the circuit board 2 preferably has a thickness of 0.3 mm or less, but preferably of 0.2 mm or less, and is therefore flexible and less prone to breakage. It is housed in a synthetic insulating housing 13, which longitudinally fills most of the cavity 72 in the handle 7.
  • the control unit 20 is mounted on the left-hand side of the printed circuit board 2, which comprises a plurality of electronic SMD components, including a microcontroller, mounted by a so-called reflow process.
  • the connecting cables 12 are mounted parallel to the printed circuit board on the right side thereof by the so-called auto-splice method.
  • a synthetic seal 121 (made of Santoprene or other elastomer, for example) holds the cables 120 in place and prevents moisture infiltration into the housing.
  • the control circuit 1 also includes a contactless transmitter-receiver in order to exchange data with the external contactless data carrier.
  • the contactless transceiver comprises a resonance circuit shown in FIG. 3 with an induction coil 3 and a capacitance 4, which are mounted directly on the printed circuit board 2. It is used to match the impedance of the transceiver to the driver stage of the microcontroller.
  • the induction coil 3 consists of a winding of an electrically insulated wire 33 on a plate-shaped ferromagnetic ferrite core 35.
  • the length of the ferrite core is preferably greater than 40 mm, for example 64 mm, while its thickness is less than 4 mm, for example 2 mm.
  • the two end parts 31 of the wound wire 33 are mechanically connected to the surface of the ferrite core 35, that is to say fastened, for example by connecting means such as adhesive or an adhesive tape between the wire 33 and the ferrite core 35, or by the surface of the Wire 33 is solidarized directly with the surface of the ferrite core 35, for example by soldering.
  • the end portions 31 of the wound wire 33 are either glued directly to the ferrite core 35 or by one double-sided adhesive tape mechanically connected to the surface of the ferrite core 35.
  • adhesive tape has the disadvantage that the thickness of the coil is increased by the tape, which can prove to be a disadvantage for the integration of the coil into a thin handle.
  • This mechanical connection enables the distance between adjacent turns, between each turn and the ferrite core and the angle between each turn and the edge of the ferrite core to be kept stable and reproducible. It would also be possible, instead of only the first and last, to mechanically connect all the turns to the surface of the ferrite core, for example using self-adhesive wire.
  • the two ends 32 of the ferrite core are also metallized.
  • the metallization is carried out, for example, by immersion in a tin or conductive lacquer casting bath. It would also be possible to metallize the ends of the ferrite core by means of a galvanic process.
  • the two free ends of the wire are soldered to the named metallized ends. This also enables the angle and the position of the last turns to be checked. In addition, it enables simplified manipulation of the induction coil, which, like a conventional SMD component, can be soldered directly onto the printed circuit board 2, regardless of the position of the wire. The coil can thus be processed as an SMD component.
  • soldering the wire instead of soldering the wire to the ends of the ferrite core, it is also possible within the scope of the invention to weld it or to glue it with a conductive adhesive.
  • soldering or soldering must therefore also include welding or gluing with an electrically conductive adhesive.
  • the capacitance 4 is preferably a ceramic or polypropylene capacitance with a capacitance of approximately 3.3nF to 18nF, but preferably of approximately 15 to 18nF. It is preferably soldered directly onto a metallized end 32 of the ferrite core 35. To increase the overall thickness of the To avoid induction coil, a foot 40 of the capacitance 4 is soldered to the narrow lateral side of the ferrite core.
  • the ferrite core is preferably made of Ni-Zn. In one variant, it consists of Mn-Zn and is covered with an insulating layer. This layer can, for example, be a lacquer layer or consist of adhesive tape.
  • the control circuit 1 also comprises a proximity sensor with, in this preferred example, two proximity sensor electrodes 5, in order to sense people who are approaching the handle.
  • the proximity sensor electrodes 5 are electrically connected to the control unit 20 such that the movement of a hand between the bow-shaped outer part 7 of the handle and the vehicle door can be determined quickly and reliably.
  • An electrostatic shield 21 is preferably provided between the proximity sensor electrodes 5 and the induction coil 3. This shielding prevents, inter alia, that the determination of the capacitance between the proximity sensor electrodes and the ground is disturbed by the induction coil 3.
  • a touch sensor 22 is mounted on the left side of the printed circuit board 2 in such a way that contacts between the hand, in particular the thumb, the user requesting access in the vehicle and the outside of the handle can be determined.
  • the touch sensor contains a capacitance, with an electrode on the lower side of the printed circuit board 2 and another electrode on the upper side of the printed circuit board, which can consist, for example, of the basic interconnects on the upper side of the printed circuit board.
  • the capacitance of the touch sensor is preferably less than 5pF.
  • the touch sensor also contains a capacitance measuring system in order to determine the changes in capacitance or charge caused by the user finger and to direct it to the named microcontroller.
  • the control unit 20 and the touch sensor 22 are connected to the transmitter-receiver circuit and to the connecting cables 12 via conductor tracks on the printed circuit board 2. These tracks run under the induction coil 3, possibly also on the other side of the circuit board and / or through inner layers.
  • the circuit board 2 is accommodated in a synthetic housing 13 which extends substantially through the entire length of the cavity 72 in the handle part 7.
  • the housing 13 and the proximity electrodes 5 are preferably slightly curved in order to adapt to the bowed shape of the handle part 7. Since curved ferrite cores are expensive and because problems with wire winding on a bow-shaped core can arise, only the two ends of the housing 13 are preferably curved, as can be seen in FIG. 2.
  • the core of the coil and thus the entire coil 3 is flexible. Since the circuit board is preferably so thin that it also has a certain flexibility, the adaptation of the control circuit to the bowed shape of the handle part 7 is considerably simplified. In addition, a flexible magnetic core is less breakable than a ferrite core. The reliability of the control circuit is thus significantly increased by reducing its sensitivity to the bumps that are unavoidable in a car door.
  • the flexible core consists of several thin, flexible layers of magnetic material that are held together with flexible fasteners.
  • the magnetic core is formed from an amorphous magnetic material, that is to say from a flexible casting compound in which small particles of a material with high permeability, such as ferrite particles, are cast.
  • the magnetic core is in several parts.
  • it consists of several smaller parts made of a possibly hard magnetic material such as ferrite, which are connected together with a preferably magnetic flexible material.
  • the circuit board 2 with all components is encapsulated in a thermoplastic insulating material which is injected into the cavity and which protects the components from moisture and dirt.
  • a "hot melt” material can be used which is sprayed at a temperature of approximately 215 ° degrees and low pressure.

Landscapes

  • Lock And Its Accessories (AREA)

Abstract

L'invention concerne un circuit de commande électronique d'un système de fermeture d'une portière d'automobile. Ce circuit comprend une unité de commande (20) dotée d'une bobine d'inductance (3) et destinée à retransmettre une demande de données à un support de données externe sans contact et à déclencher le déverrouillage du système de fermeture de la portière d'automobile si l'on reçoit une réponse valide du support de données. Ce circuit comprend également un détecteur de proximité doté d'au moins une électrode de proximité (5) et destiné à déclencher la retransmission de la demande de données lorsqu'une personne s'approche de l'électrode de proximité. La bobine d'inductance (3) qui contient un tore de ferrite (35) et un fil (33) enroulé autour du tore de ferrite, est logée dans une cavité (72) d'une poignée (7) du système de fermeture de la portière d'automobile. Au moins une partie (31) des tours du fil est reliée à la surface du tore de ferrite de telle manière que la bobine puisse être transformée en tant que composant CMS.
EP03701427A 2002-02-22 2003-02-17 Bobine d'inductance destinee notamment au systeme de fermeture d'une portiere de vehicule Withdrawn EP1476622A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH3112002 2002-02-22
CH311022002 2002-02-22
PCT/CH2003/000115 WO2003071068A1 (fr) 2002-02-22 2003-02-17 Bobine d'inductance destinee notamment au systeme de fermeture d'une portiere de vehicule

Publications (1)

Publication Number Publication Date
EP1476622A1 true EP1476622A1 (fr) 2004-11-17

Family

ID=27740053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03701427A Withdrawn EP1476622A1 (fr) 2002-02-22 2003-02-17 Bobine d'inductance destinee notamment au systeme de fermeture d'une portiere de vehicule

Country Status (3)

Country Link
EP (1) EP1476622A1 (fr)
AU (1) AU2003203121A1 (fr)
WO (1) WO2003071068A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004091044A1 (fr) * 2003-04-10 2004-10-21 Schaffner Emv Ag Antenne comprenant un noyau de ferrite, destinee a un systeme de fermeture de porte d'automobile
DE102004037682A1 (de) * 2004-08-02 2006-03-16 Huf Hülsbeck & Fürst Gmbh & Co. Kg Sendeantennenanordnung zum Abstrahlen eines langwelligen Aufwecksignals für einen ID-Geber eines schlüssellosen Kraftfahrzeugzugangssystems
DE102004051505B8 (de) * 2004-10-21 2008-08-07 Daimler Ag Anordnung von Spulen
JP4938580B2 (ja) 2007-07-27 2012-05-23 アイシン精機株式会社 ドアハンドル装置
JP4751861B2 (ja) 2007-07-27 2011-08-17 アイシン精機株式会社 ドアハンドル装置
JP5131472B2 (ja) 2008-07-24 2013-01-30 アイシン精機株式会社 ドアハンドル装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997041322A1 (fr) * 1996-04-27 1997-11-06 Huf Hülsbeck & Fürst Gmbh. & Co. Kg. Systeme de fermeture, notamment pour automobiles

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
DE3510638C1 (de) * 1985-03-23 1986-10-16 Neosid Pemetzrieder Gmbh & Co Kg, 5884 Halver Induktives Miniatur-Bauelement, insbesondere Miniatur-Spule sowie Verfahren zur Herstellung eines solchen Bauelements
KR870700249A (ko) * 1985-05-10 1987-05-30 아튜시 이소베 코드 부착코일 및 그 제조방법
EP1023511B2 (fr) * 1997-10-14 2007-04-11 Huf Hülsbeck & Fürst GmbH & Co. KG Dispositif de fermeture, en particulier pour vehicules automobiles
AU742683B2 (en) * 1998-03-16 2002-01-10 Robert Bosch Gmbh A door handle and a transponder system
DE19812836A1 (de) * 1998-03-24 1999-09-30 Pemetzrieder Neosid Induktives Miniatur-Bauelement für SMD-Montage
DE19832285B4 (de) * 1998-07-17 2004-01-29 Siemens Ag Zugangskontrolleinrichtung für ein Kraftfahrzeug
DE10107319A1 (de) * 2000-02-18 2002-01-31 Aisin Seiki Rahmenantennenvorrichtung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997041322A1 (fr) * 1996-04-27 1997-11-06 Huf Hülsbeck & Fürst Gmbh. & Co. Kg. Systeme de fermeture, notamment pour automobiles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO03071068A1 *

Also Published As

Publication number Publication date
WO2003071068A1 (fr) 2003-08-28
AU2003203121A1 (en) 2003-09-09

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