DE102015013445A1 - Locking system for a vehicle - Google Patents

Locking system for a vehicle Download PDF

Info

Publication number
DE102015013445A1
DE102015013445A1 DE102015013445.0A DE102015013445A DE102015013445A1 DE 102015013445 A1 DE102015013445 A1 DE 102015013445A1 DE 102015013445 A DE102015013445 A DE 102015013445A DE 102015013445 A1 DE102015013445 A1 DE 102015013445A1
Authority
DE
Germany
Prior art keywords
antenna
vehicle
frequency
frequency signals
low
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Withdrawn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
DE102015013445.0A
Other languages
German (de)
Inventor
Matthias Reinhardt
Armin Stummvoll
Joachim Kraft
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.)
Daimler AG
Original Assignee
Daimler 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 Daimler AG filed Critical Daimler AG
Priority to DE102015013445.0A priority Critical patent/DE102015013445A1/en
Publication of DE102015013445A1 publication Critical patent/DE102015013445A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • GPHYSICS
    • G08SIGNALLING
    • G08CTRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link

Abstract

The invention relates to a locking system (2) for a vehicle, comprising at least one antenna (1). According to the invention, the antenna (1) is provided both for transmitting and / or receiving low-frequency signals and for transmitting and / or receiving higher-frequency signals.

Description

  • The invention relates to a locking system for a vehicle according to the features of the preamble of claim 1.
  • Keyless locking systems for vehicles are well known in the art. These locking systems have at least two antennas arranged in and / or on the vehicle, one antenna for low-frequency signals, also referred to as LF antenna (LF = Low Frequency), and another antenna for higher-frequency signals, also referred to as RF antenna (HF = High frequency). The antenna for low frequency signals is for waking, d. activating, and locating an identification unit integrated in a vehicle key. The further antenna for higher-frequency signals is used for data communication between the identification unit and the vehicle.
  • Furthermore, in the DE 11 2010 005 936 T5 an antenna and RF front-end arrangement described. The antenna arrangement comprises at least one LTE or WCDMA Tx & Rx antenna, a MIMO Rx or diversity antenna designed for low band LTE or WCDMA, and a MIMO Rx or diversity antenna suitable for high band LTE or WCDMA is designed. At least one of the MIMO Rx or Diversity antennas is designed to send and receive WLAN and / or BlueTooth signals.
  • The invention is based on the object to provide a comparison with the prior art improved locking system for a vehicle.
  • The object is achieved by a locking system for a vehicle with the features of claim 1.
  • Advantageous embodiments of the invention are the subject of the dependent claims.
  • A locking system for a vehicle comprises at least one antenna, which according to the invention is provided both for transmitting and / or receiving low-frequency signals and for transmitting and / or receiving higher-frequency signals.
  • In particular, this locking system is a keyless access authorization system and expediently also a keyless entry authorization system of the vehicle. Ie. the locking system grants access to the vehicle to a user of the vehicle, which has an identification unit integrated, for example, in a vehicle key or in another mobile unit, by unlocking one or more vehicle doors and advantageously also, in particular also keyless, starting a drive motor of the vehicle, for example by means of a start button in the vehicle.
  • Preferably, in the solution according to the invention, an antenna is used as the antenna, which antenna was previously used exclusively for transmitting and / or receiving the low-frequency signals, ie. H. a so-called low-frequency antenna or LF antenna (LF = Low Frequency). Ie. the higher-frequency signals, which in particular serve for data communication between the identification unit and the vehicle and for which a separate antenna is used in the prior art, also referred to as an RF antenna (HF = High Frequency), are preferably transmitted via the same line to it as LF Antenna trained antenna guided as the low frequency signals. Thus, this antenna, preferably the conventional low-frequency antenna or LF antenna, has the task of emitting and / or receiving both the low-frequency and the higher-frequency signals.
  • By using the same antenna, in particular the so-called low-frequency antenna or LF antenna, both for transmitting and / or receiving low-frequency signals, for example in a frequency range of less than or up to 200 kHz, as well as for transmitting and / or receiving higher-frequency Signals an additional separate antenna, in particular the separate RF antenna, saved. As a result, more space in the vehicle for other vehicle components is available or the vehicle can be designed differently, since the space for the additional antenna is not required. In addition, this weight and cost reduction is achieved. The higher-frequency signals are, for example, in a frequency range from or greater than 300 kHz, expediently in a frequency range from or greater than 100 MHz, preferably in a frequency range from or greater than 300 MHz, for example at 315 MHz and / or 434 MHz and / or 868 MHz and / or 915 MHz.
  • Embodiments of the invention are explained in more detail below with reference to drawings.
  • Showing:
  • 1 FIG. 2 schematically a perspective view of an antenna of a locking system for a vehicle arranged in a housing, FIG.
  • 2 schematically the antenna according to 1 without housing in a plan view, and
  • 3 schematically a return loss frequency diagram.
  • Corresponding parts are provided in all figures with the same reference numerals.
  • The 1 and 2 show, schematically simplified, an antenna 1 a locking system 2 for a vehicle, the antenna 1 in 1 with housing 3 or holder and in 2 open, ie without this housing 3 or the holder, is shown.
  • In the locking system 2 it is in particular a keyless conditional access system and expediently further a keyless entry authorization system of the vehicle. Ie. the locking system 2 grants access to the vehicle to a user of the vehicle, which has an identification unit integrated, for example, in a vehicle key or in another mobile unit, by unlocking one or more vehicle doors and advantageously also starting, in particular also keyless, a drive motor of the vehicle, for example by means of a start button in the vehicle.
  • Such locking systems known from the prior art have at least two antennas arranged in and / or on the vehicle, at least one antenna for low-frequency signals, also referred to as low-frequency antenna or LF antenna (LF = Low Frequency), and a further antenna for higher-frequency signals , also called RF antenna (HF = High Frequency). The antenna for low frequency signals is for waking, d. activating, and locating the identification unit integrated in a vehicle key. Usually, locking systems known from the prior art have a plurality of, for example four, such LF antennas. The other antenna for higher frequency signals, d. H. the RF antenna, serves for data communication between the identification unit and the vehicle. The known from the prior art locking systems further expediently have sensors in door handles, the start button for the engine start, also referred to as start-stop button, a control device and an antenna module for RF communication via the RF antenna.
  • In contrast to this prior art comprises in the solution shown here, the locking system 2 at least one antenna 1 , which is provided both for transmitting and / or receiving low-frequency signals as well as for transmitting and / or receiving higher-frequency signals. An embodiment of this antenna 1 is in the 1 and 2 shown.
  • Preferably, in this solution as an antenna 1 the so-called low-frequency antenna or LF antenna used, which was previously used exclusively for transmitting and / or receiving the low-frequency signals. Ie. the higher frequency signals, which in particular serve the data communication between the identification unit and the vehicle and for which the separate RF antenna is used in the prior art, are transmitted over the same line 4 to this preferably designed as LF antenna antenna 1 guided as the low-frequency signals. This is the antenna 1 over this line 4 expediently coupled to the antenna module for the RF communication. Thus this antenna has 1 , preferably the conventional low-frequency antenna or LF antenna, has the task of emitting and / or receiving both the low-frequency and the higher-frequency signals. This antenna 1 thus serves both the awakening, d. h, the activation and location of the identification unit integrated, for example, in the vehicle key or in another mobile unit, as well as the data communication between the identification unit and the vehicle.
  • By using the same antenna 1 , in particular the so-called low-frequency antenna or LF antenna, both for transmitting and / or receiving low-frequency signals, for example in a frequency range of less than or up to 200 kHz, as well as for transmitting and / or receiving higher-frequency signals is an additional separate Antenna, in particular the separate RF antenna, saved. As a result, more space in the vehicle for other vehicle components is available or the vehicle can be designed differently, since the space for the additional antenna is not required. In addition, this weight and cost reduction is achieved. The higher-frequency signals are, for example, in a frequency range from or greater than 300 kHz, expediently in a frequency range from or greater than 100 MHz, preferably in a frequency range from or greater than 300 MHz, for example at 315 MHz and / or 434 MHz and / or 868 MHz and / or 915 MHz.
  • The locking system described here 2 Thus, expediently, with the exception of the separate RF antenna, all components already described above or at least some of these components, ie in particular the at least one antenna 1 or preferably several, for example four, such antennas 1 , which both for transmitting and / or receiving the low-frequency Signals are used as well as for transmitting and / or receiving the higher frequency signals, and expediently further the sensors in the door handles, the start button for the engine start, the control unit and the antenna module for the RF communication, of these other components mentioned some may be optional, ie not in every embodiment of the locking system 2 must be present.
  • The in the 1 and 2 schematically illustrated antenna 1 which is used both for transmitting and / or receiving the low-frequency signals as well as for transmitting and / or receiving the higher-frequency signals, and which in particular is the already used low-frequency antenna or LF antenna for transmitting and / or receiving the low-frequency signals includes a variety of turns 5 which has a ferrite core 6 enclose. Low-frequency currents, in particular with frequencies f of less than 200 kHz, flow through this antenna 1 and generate a desired alternating magnetic field. In the solution described, high-frequency voltages, in particular with frequencies f of greater than 300 kHz, expediently greater than 100 MHz, preferably greater than 300 MHz, for example 315 MHz and / or 434 MHz and / or 868 MHz and / or 915, are parallel to this MHz, to this antenna 1 , whose exemplary embodiment in the 1 and 2 shown is connected.
  • A structure of such an antenna 1 is similar to a helix antenna design as long as a return conductor is not taken into account. Because a number of turns 5 for higher frequencies f, ie for the abovementioned frequencies f, in particular for frequencies f over 100 MHz, preferably over 300 MHz, is too large, this return conductor plays no role for the higher-frequency signals, so that it is a helical antenna for the higher frequency signals. That way, this antenna can 1 also be used for transmitting and / or receiving higher-frequency signals, so that no separate RF antenna is required, ie the separate RF antenna is saved. For the higher-frequency signals in particular a frequency range above 100 MHz is useful, since the higher-frequency signal range should be well above the low-frequency signal range, so that the higher-frequency current is not completely through the coil, which by the windings 5 is formed, flows, but is emitted by this.
  • 3 shows a return loss D-frequency f-diagram with a return loss curve VD, which was determined in measurements that were carried out with a previously used in production vehicles LF antenna, which was not optimized for RF applications. The measurements also revealed an antenna gain of approx. -5 dBi on the measurement pattern. A cable antenna, ie a coaxial antenna with an exposed inner conductor, showed a nearly equal antenna gain, more precisely an antenna gain that was about 1 dB to 2 dB worse.
  • By the described solution thus there is a smaller space requirement, since no separate RF antenna is required. Furthermore, especially when using the previous LF antenna as an antenna 1 for the locking system 2 , already given a defined structure, so that variations due to geometric tolerances are small. This eliminates the need for separate holders for a separate RF antenna.
  • LIST OF REFERENCE NUMBERS
  • 1
    antenna
    2
    locking system
    3
    casing
    4
    management
    5
    turns
    6
    ferrite
    f
    frequency
    D
    Return loss
    VD
    Return Loss History
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • DE 112010005936 T5 [0003]

Claims (3)

  1. Locking system ( 2 ) for a vehicle, comprising at least one antenna ( 1 ), characterized in that the antenna ( 1 ) is provided both for transmitting and / or receiving low-frequency signals as well as for transmitting and / or receiving higher-frequency signals.
  2. Locking system ( 2 ) according to claim 1, characterized in that the low-frequency signals are in a frequency range of less than 200 kHz.
  3. Locking system ( 2 ) according to claim 1 or 2, characterized in that the higher-frequency signals are in a frequency range of greater than 300 MHz.
DE102015013445.0A 2015-10-16 2015-10-16 Locking system for a vehicle Withdrawn DE102015013445A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102015013445.0A DE102015013445A1 (en) 2015-10-16 2015-10-16 Locking system for a vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015013445.0A DE102015013445A1 (en) 2015-10-16 2015-10-16 Locking system for a vehicle

Publications (1)

Publication Number Publication Date
DE102015013445A1 true DE102015013445A1 (en) 2016-04-21

Family

ID=55638016

Family Applications (1)

Application Number Title Priority Date Filing Date
DE102015013445.0A Withdrawn DE102015013445A1 (en) 2015-10-16 2015-10-16 Locking system for a vehicle

Country Status (1)

Country Link
DE (1) DE102015013445A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112010005936T5 (en) 2010-10-13 2013-07-25 Epcos Ag Antenna and RF front-end arrangement

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112010005936T5 (en) 2010-10-13 2013-07-25 Epcos Ag Antenna and RF front-end arrangement

Similar Documents

Publication Publication Date Title
US20170179573A1 (en) Near field communications (nfc) coil with embedded wireless antenna
JP6234566B2 (en) Wireless communication apparatus and method
US10069336B2 (en) Inductive charging device, electric vehicle, charging station, and method for inductive charging
US9491007B2 (en) Apparatus and method for antenna matching
US20170040834A1 (en) Charging apparatus
JP4927781B2 (en) Portable machine
DE10324847B4 (en) Reception antenna, core and portable device
US9577332B2 (en) Electronic device and multi-band antenna
US9553479B2 (en) Method for controlling wireless charging depending on position of FOB key
US20120168517A1 (en) Sim card assembly, method of manufacturing the same, and electronic device including the same
EP2942760A1 (en) Field measurement compensation
EP3131209B1 (en) Nfc antenna architecture for mobile communication device with single-piece metal housing
DE102006055386B4 (en) Whole body antenna for a magnetic resonance system and magnetic resonance system with such a whole body antenna
CN105917661B (en) Vehicle communication device
KR101869181B1 (en) Driver circuit for an inductor and active transmitter device having a driver circuit
US10256526B2 (en) Near field communication antenna, near field communication device and mobile device having the same
JP4535007B2 (en) On-board integrated antenna device mounting structure
DE102013215025B4 (en) System for determining the position of a portable device, method for determining the position of a portable device, and device for determining the position of a portable device
US20070132453A1 (en) Rf shielding method, mri apparatus, and transmtiting/receiving surface coil
CN104704585B (en) For electric energy acquisition and/or the device and method of wireless communication
EP1689028A4 (en) Information processing device having non-contact reader and/or writer and coil antenna for magnetic connection
EP1721785B1 (en) Apparatus and method for remote control of an electronic device
JP2007332547A (en) Controller for door lock mechanism, and control method for door lock mechanism
US20170062912A1 (en) Device antenna for multiband communication
KR20030040160A (en) Method of arranging receiving antenna

Legal Events

Date Code Title Description
R230 Request for early publication
R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee