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WO2016157773A1 - Unité de bobine - Google Patents

Unité de bobine Download PDF

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Publication number
WO2016157773A1
WO2016157773A1 PCT/JP2016/001470 JP2016001470W WO2016157773A1 WO 2016157773 A1 WO2016157773 A1 WO 2016157773A1 JP 2016001470 W JP2016001470 W JP 2016001470W WO 2016157773 A1 WO2016157773 A1 WO 2016157773A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
conductive member
antenna
portable key
verification request
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
Application number
PCT/JP2016/001470
Other languages
English (en)
Japanese (ja)
Inventor
朋宏 久野
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.)
Denso Corp
Original Assignee
Denso Corp
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 Denso Corp filed Critical Denso Corp
Publication of WO2016157773A1 publication Critical patent/WO2016157773A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/20—Means to switch the anti-theft system on or off
    • B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type
    • H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers
    • H01F21/06—Variable inductances or transformers of the signal type continuously variable, e.g. variometers by movement of core or part of core relative to the windings as a whole
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
    • H01Q7/08—Ferrite rod or like elongated core

Definitions

  • the present disclosure relates to a coil unit including a coil.
  • an LF (long wave) band radio wave is used to transmit a radio signal from the in-vehicle device to the portable device. If a metal exists in the vicinity of an antenna for transmitting a radio signal, the resonance frequency changes.
  • an antenna device has been devised in which the coil bobbin can be fixed at different positions of the case in the axial direction of the core inserted into the coil bobbin and the resonance frequency can be easily adjusted (see Patent Document 1).
  • the resonance frequency changes as described above, and the coil impedance also increases.
  • a change in the resonance frequency can be prevented by adjusting the inductance value in advance according to the mounting state of the antenna.
  • the increase in impedance there are a method of increasing the voltage of the driver for driving the antenna or a method of securing a distance between the antenna and the surrounding metal.
  • the booster circuit may become large or complicated, or the current consumption may increase.
  • the voltage cannot be increased because an appropriate driver cannot be used due to the limitation of the capacity of the housing that houses the antenna. If the voltage is insufficient, sufficient antenna current cannot be secured, the output electric field strength decreases, the communication distance becomes short, and communication cannot be performed.
  • the antenna housing may be enlarged or a spacer may be provided between the antenna and the mounting surface (peripheral metal), but the antenna may be enlarged.
  • This disclosure is intended to provide a coil unit that can suppress an increase in coil impedance even when the coil is disposed close to a conductive member.
  • the coil unit is disposed between the coil, the coil, and the first conductive member having conductivity, which is disposed in the vicinity of the coil, and the coil is formed by the first conductive member. And a second conductive member having conductivity that suppresses a change in impedance.
  • the electronic key system collates the portable key by wireless communication between the portable key, the in-vehicle device mounted on the vehicle, and the portable key and the in-vehicle device.
  • ECU which performs predetermined control based on.
  • the in-vehicle device includes an antenna of a verification request transmission unit that transmits a verification request signal to the portable key.
  • the portable key includes an antenna of a verification request receiving unit that receives a verification request signal. Both the antenna of the verification request transmitting unit and the antenna of the verification request receiving unit include the coil unit.
  • FIG. 1 is a diagram illustrating an electronic key system according to an embodiment of the present disclosure.
  • III-III sectional view of FIG. 1 is a partial cross-sectional view showing an antenna according to one embodiment.
  • 1 is a partial cross-sectional view showing an antenna according to one embodiment.
  • 1 is a partial cross-sectional view showing an antenna according to one embodiment.
  • 1 is a partial cross-sectional view showing an antenna according to one embodiment.
  • 1 is a partial cross-sectional view showing an antenna according to one embodiment.
  • 1 is a partial cross-sectional view showing an antenna according to one embodiment.
  • the figure which shows the equivalent circuit of the antenna of the comparative example of this indication The figure which shows the relationship between the distance of a coil and the 1st electrically-conductive member, and the impedance of an antenna by one Example of this indication.
  • the electronic key system 100 includes an ECU 4 (on-vehicle device) mounted on the vehicle 1, an outdoor LF transmission unit 41 (on-vehicle device, verification request transmission unit), an indoor LF transmission unit 43 ( An in-vehicle device, a verification request transmission unit), an RF reception unit 45, a door unit 5, a start switch 6, and a portable key 3 possessed by the user.
  • ECU 4 on-vehicle device
  • outdoor LF transmission unit 41 on-vehicle device, verification request transmission unit
  • an indoor LF transmission unit 43 An in-vehicle device, a verification request transmission unit
  • an RF reception unit 45 a door unit 5, a start switch 6, and a portable key 3 possessed by the user.
  • the ECU 4, the door unit 5, and the start switch 6 are connected by a communication line 7 such as a LAN and can communicate with each other.
  • the ECU4 is comprised as a computer containing well-known CPU and a peripheral circuit.
  • the ECU 4 includes a memory 40 that is a non-volatile storage medium for storing various information necessary for the operation of the electronic key system 100 such as a master code for collation of the portable key 3.
  • the outdoor LF transmitter 41 is, for example, inside the pillar of the vehicle body, inside the side sill that is a frame member arranged on the lower side of the door, inside the side step attached to the side sill, rear bumper, or inside the door unit 5.
  • the indoor LF transmitter 43 is provided in the vehicle 1.
  • the outdoor LF transmitter 41 and the indoor LF transmitter 43 use the LF (long wave) band or the VLF (very long wave) radio wave, for example, in the range of about 1 to 2 m from the antennas 42 and 44. Send.
  • the RF receiver 45 is provided, for example, inside the center console in the passenger compartment.
  • the RF receiver 45 receives a response signal from the portable key 3 or an RKE (remote keyless entry) command signal transmitted from the outside of the vehicle or from the vehicle interior using radio waves in the RF (high frequency) band by the antenna 46.
  • radio waves in the RF band By using radio waves in the RF band, a signal from the portable key 3 can be received even when the user is away from the vehicle 1 (for example, 30 to 100 m).
  • the door unit 5 includes a lock device 50, a touch sensor 51, and a lock button 52.
  • the door unit 5 is a generic term for each door unit of a plurality of doors of the vehicle 1.
  • the plurality of doors include a driver seat side door, a passenger seat side door, a rear seat right door, a rear seat left door, and the like.
  • the lock device 50 includes an actuator such as a motor and its drive circuit, and switches and controls the lock state and the unlock state based on a control command from the ECU 4.
  • the touch sensor 51 is provided on the door handle and detects that the user has gripped the door handle.
  • the lock button 52 is provided near the door handle and detects a user's door lock operation.
  • the start switch 6 is a switch for bringing the prime mover (engine or motor) of the vehicle 1 into a start state or a start permission state.
  • the portable key 3 includes a control unit 32, an LF reception unit 30 (collation request reception unit), an RF transmission unit 31, a memory 33 that is a nonvolatile storage medium, and an operation unit 34 connected to the control unit 32.
  • the control unit 32 is configured as a known computer and controls the operation of the entire portable key 3.
  • the memory 33 stores an ID code for identifying the portable key 3 together with data necessary for the operation of the portable key 3.
  • the LF receiver 30 receives a verification request signal from the vehicle 1 via the antenna 30a.
  • the controller 32 causes the RF transmitter 31 to transmit a response signal including an ID code from the antenna 31a.
  • the operation unit 34 is a push switch group for using the RKE function.
  • an RKE command signal for locking / unlocking or opening / closing a door or trunk is transmitted from the RF transmission unit 31.
  • the electronic key system 100 requests a collation request from the outdoor LF transmitter 41 to the portable key 3.
  • a signal is transmitted a predetermined number of times.
  • the portable key 3 receives the verification request signal, it returns a response signal from the RF transmitter 31.
  • the ECU 4 collates the ID code and the master code included in the received response signal, and if the collation is successful, outputs a control command to the lock device 50 so that the door is unlocked.
  • a signal for requesting collation is transmitted from the indoor LF transmitter 43 to the portable key 3 a predetermined number of times.
  • the portable key 3 receives the verification request signal, it returns a response signal.
  • the ECU 4 performs collation in the same manner as described above. If the collation is successful, the control command for setting the prime mover in the start state or the start permission state is transmitted to the prime mover ECU that performs rotation control of the prime mover of the vehicle 1 via the communication line 7. Is output.
  • the coil unit of the present disclosure is used for the antennas 42, 44, and 30a.
  • the outdoor LF transmission unit 41, the indoor LF transmission unit 43, and the LF reception unit 30 may be a communication device using a long wave band. With this configuration, the configuration of the present disclosure can be applied to an antenna for long wave band communication that requires longer communication distance and reduced current consumption.
  • the said structure contains the portable key 3 which a user possesses, and the vehicle-mounted apparatus (ECU4, outdoor LF transmission part 41, indoor LF transmission part 43) mounted in the vehicle, between a portable key and vehicle-mounted apparatus.
  • the portable key is verified by wireless communication.
  • the coil 72 includes a verification request transmission unit (outdoor LF transmission unit 41, indoor LF transmission unit) that transmits a verification request signal to the portable key of the in-vehicle device. 43) and antennas 30a of the collation request receiving unit (LF receiving unit 30) that receives the collation request signal of the portable key.
  • FIG. 2 is a side view of the inside of the antenna 42
  • FIG. 3 is a cross-sectional view taken along the line III-III of FIG. A terminal or lead wire for connecting the antenna 42 to the outdoor LF transmitter 41 is not shown.
  • the antenna 42 is made of a bobbin 71, a coil 72 wound around the bobbin 71, ferrite, amorphous, or the like, and a core 73 inserted into the bobbin 71 is housed in a substantially rectangular casing 74 made of, for example, resin. .
  • a configuration without the bobbin 71 and the core 73 is also possible.
  • Both ends of the bobbin 71 are in contact with the inner wall surface of the lower part of the casing 74, thereby supporting the coil 72.
  • Both end portions of the bobbin 71 may be fixed to the inner wall surface of the lower portion of the housing 74. Further, the bobbin 71 may be in contact with the inner wall surface at the top of the housing 74.
  • the housing 74 is attached to the first conductive member 60 having conductivity.
  • the first conductive member 60 is a bracket, a door outer panel constituting a door outer plate, or the like, and is made of a metal having a high electrical resistivity (about 1 ⁇ 10 ⁇ 7 ⁇ ⁇ m) such as iron, platinum, or tin. Use.
  • a second conductive member 61 having conductivity is disposed between the housing 74 and the first conductive member 60.
  • the second conductive member 61 is made of a metal having a low electrical resistivity (about 1 ⁇ 10 ⁇ 8 ⁇ ⁇ m) such as aluminum, gold, copper, or silver. Each conductive member is selected so that the electrical resistivity of the first conductive member 60 is equal to or greater than that of the second conductive member 61.
  • the second conductive member 61 having the same electrical resistivity as the first conductive member 60 or lower than the first conductive member 60 is used.
  • the greater the electrical resistivity the greater the change (eg, increase) in coil impedance.
  • the second conductive member 61 is disposed between the coil 72 and the first conductive member 60, the amount of increase in impedance is largely determined by the second conductive member 61. With the above configuration, an increase in impedance due to the first conductive member 60 can be suppressed.
  • the configuration of the present disclosure can be applied when a coil is placed close to a body that mainly uses iron. Further, by using aluminum as the second conductive member 61, the configuration of the present disclosure can be realized at a relatively low cost, and an increase in the weight of the coil unit can be suppressed. Further, aluminum may be used as the first conductive member 60.
  • the cross sections of the bobbin 71 and the coil 72 are substantially circular, but they may be substantially rectangular. Further, the cross section of the housing 74 is substantially rectangular, but may be substantially circular. The cross section of the housing 74 may have a shape that matches the cross sections of the bobbin 71 and the coil 72.
  • the distance between the coil 72 and the second conductive member 61 (for example, D in FIG. 3) is preferably close to zero.
  • the coil 72 and the second conductive member 61 may be in contact with each other as long as the insulation between the two can be ensured. Thereby, the enlargement (especially height direction: the up-down direction of drawing) of a housing
  • the second conductive member 61 covers the bottom surface of the outer wall portion of the casing 74, that is, the entire facing surface facing the first conductive member 60.
  • the second conductive member 61 is in the direction of the central axis of the coil 72 on the bottom surface of the casing 74 as in the second conductive member 62 in FIG.
  • An area corresponding to about 2/3 of the length L may be covered.
  • the second conductive member 61 covers a region corresponding to about 1 ⁇ 2 of the length L in the central axis direction of the coil 72 on the bottom surface of the housing 74. Also good.
  • the second conductive member 62 may be arranged so as to cover only a range where the coil 72 or the core 73 faces the first conductive member 60.
  • the range in which the coil 72 faces the first conductive member 60 is a range indicated by L11 in FIG. 2 and L12 in FIG.
  • the range in which the core 73 faces the first conductive member 60 is a range indicated by L21 in FIG. 2 and L22 in FIG.
  • the arrangement range of the second conductive members 61, 62, 63 may be determined by the characteristics of the coil 72 and the first conductive member 60.
  • the arrangement range of the second conductive members 61, 62, 63 may be determined by the distance between the coil 72 and the first conductive member 60 (for example, D in FIG. 3). That is, it is determined according to the amount of increase in impedance of the antenna 42 by the first conductive member 60. Thereby, the antenna 42 can be adjusted to a desired impedance.
  • a potting material (sealing material) 75 may be injected into the housing 74.
  • the coil 72 and the core 73 may be included in insert molding.
  • the coil 72 is housed in a housing 74, and the second conductive members 61, 62, 63 are attached to the outer wall of the housing 74 facing the first conductive member 60. .
  • the antenna and the second conductive members 61, 62, and 63 can be integrated to reduce the number of components.
  • attachment to the first conductive member 60 is also facilitated.
  • the distance between the coil 72 and the second conductive members 61, 62, 63 can be kept constant, and even if the distance between the coil 72 and the first conductive member 60 varies when the antenna is mounted, the amount of change in impedance. Can be suppressed.
  • the second conductive member 64 may be attached to the inner wall surface of the bottom surface of the housing 74.
  • the coil 72 is housed in a housing 74, and the second conductive member 64 is attached to the inner wall surface of the outer wall of the housing 74 facing the first conductive member 60.
  • the second conductive members 61, 62, 63, 64 may be attached to both the bottom surface of the outer wall portion of the housing 74 and the inner wall surface of the bottom surface of the housing 74. That is, in FIG. 7, the second conductive member 61 is disposed between the bottom surface of the housing 74 and the first conductive member 60 as shown in FIG. 2. That is, the coil 72 is housed in the housing, and the second conductive members 61, 62, 63, and 64 are the surfaces of the outer wall of the housing facing the first conductive member 60 and the first conductive member 60 of the housing. May be attached to the inner wall surface of the outer wall opposite to. Also with this configuration, an increase in impedance due to the first conductive member 60 can be suppressed.
  • the antenna 42 may not be stored in the housing 74.
  • the antenna 42 can be represented as a series resonant circuit of L (inductance), C (capacitance), and two R (resistance of the coil), for example.
  • L inductance
  • C capacitor
  • R resistance of the coil
  • FIG. 10 shows the relationship between the distance between the coil 72 and the first conductive member 60 (corresponding to D in FIG. 3) and the impedance Z of the antenna 42 when iron is used for the first conductive member 60.
  • the impedance Z tends to increase.
  • the impedance Z when the distance D is 1 mm is 25 ⁇ .
  • a voltage required to flow 2 A of current (hereinafter referred to as “antenna current”) flowing through the coil 72 is 50V. This is supplied from the power supply P.
  • the power supply P is supplied from a battery.
  • the battery voltage is 12V and the boosting efficiency is 80%, it is necessary to supply a current of about 10.4 A from the battery.
  • the impedance Z when the distance D is 15 mm is 5 ⁇ .
  • the voltage required to flow the antenna current of 2A is 10V. Therefore, a current of about 2.1 A may be supplied from the battery.
  • the mounting position of the antenna 42 increases.
  • the battery current consumption increases as the impedance increases.
  • the electronic key system operates even when the prime mover stops and the battery is not charged, which causes an increase in dark current.
  • FIG. 11 shows an equivalent circuit of the antenna 42 of the configuration of the present disclosure (for example, FIG. 2).
  • the equivalent circuit is a series of two resistance circuits in which Rf, which is the resistance component of the first conductive member 60, and Ra, which is the resistance component of the second conductive member 61, are connected in parallel to both ends of the RLC series resonance circuit of FIG. It will be connected.
  • Rf which is the resistance component of the first conductive member 60
  • Ra which is the resistance component of the second conductive member 61
  • the impedance of the antenna 42 is about 16.8% of the configuration of the comparative example in which the second conductive member 61 is not used in the configuration of FIG. 2, and the configuration of the comparative example in the configuration of FIG.
  • the configuration of FIG. 5 is about 27.2%, which is about 68.0% of the configuration of the comparative example, and the effect of reducing impedance appears.
  • the larger the area of the second conductive member 61 the greater the effect of reducing impedance.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Lock And Its Accessories (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

La présente invention concerne une unité de bobine comportant une bobine et un deuxième élément conducteur, qui est disposé entre la bobine et un premier élément conducteur disposé près de la bobine, ledit premier élément conducteur présentant des propriétés de conduction, et qui limite une variation d'impédance de la bobine due au premier élément conducteur, ledit deuxième élément conducteur présentant des propriétés de conduction. Par conséquent, la variation d'impédance de la bobine qui se produit lorsque la bobine est rapprochée d'un élément qui augmente l'impédance peut être limitée, rendant ainsi possible une réduction de l'impédance même si une distance entre le premier élément conducteur, c.à.d. la surface d'installation de la bobine, et la bobine n'est pas garantie, et réduisant la hauteur d'installation de la bobine.
PCT/JP2016/001470 2015-03-27 2016-03-15 Unité de bobine Ceased WO2016157773A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-066026 2015-03-27
JP2015066026A JP2016186973A (ja) 2015-03-27 2015-03-27 コイルユニット

Publications (1)

Publication Number Publication Date
WO2016157773A1 true WO2016157773A1 (fr) 2016-10-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/001470 Ceased WO2016157773A1 (fr) 2015-03-27 2016-03-15 Unité de bobine

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JP (1) JP2016186973A (fr)
WO (1) WO2016157773A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6950159B2 (ja) * 2016-09-29 2021-10-13 スミダコーポレーション株式会社 アンテナ装置
JP6847752B2 (ja) * 2017-04-27 2021-03-24 株式会社ユーシン アンテナ装置、及びこれを備えたドアハンドル、移動体

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11353561A (ja) * 1997-09-12 1999-12-24 Mitsubishi Materials Corp 盗難防止用タグ
JP2000160897A (ja) * 1998-12-02 2000-06-13 Toyota Motor Corp 車両用のドアハンドル
WO2005078746A1 (fr) * 2004-02-13 2005-08-25 Mitsubishi Materials Corporation Matériau de noyau magnétique haute fréquence, son procédé de fabrication et antenne composée du matériau de noyau magnétique
WO2012099170A1 (fr) * 2011-01-19 2012-07-26 株式会社 テクノバ Système de transfert d'énergie électrique sans contact

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11353561A (ja) * 1997-09-12 1999-12-24 Mitsubishi Materials Corp 盗難防止用タグ
JP2000160897A (ja) * 1998-12-02 2000-06-13 Toyota Motor Corp 車両用のドアハンドル
WO2005078746A1 (fr) * 2004-02-13 2005-08-25 Mitsubishi Materials Corporation Matériau de noyau magnétique haute fréquence, son procédé de fabrication et antenne composée du matériau de noyau magnétique
WO2012099170A1 (fr) * 2011-01-19 2012-07-26 株式会社 テクノバ Système de transfert d'énergie électrique sans contact

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