EP1516389B1 - Niederfrequenz-funkübertragungseinrichtung für eine fahrzeugalarmanlage - Google Patents

Niederfrequenz-funkübertragungseinrichtung für eine fahrzeugalarmanlage Download PDF

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Publication number
EP1516389B1
EP1516389B1 EP03760762A EP03760762A EP1516389B1 EP 1516389 B1 EP1516389 B1 EP 1516389B1 EP 03760762 A EP03760762 A EP 03760762A EP 03760762 A EP03760762 A EP 03760762A EP 1516389 B1 EP1516389 B1 EP 1516389B1
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Prior art keywords
signal
antenna
current
antennas
voltage
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English (en)
French (fr)
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EP1516389A1 (de
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Philippe Bettan
Vincent Portet
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Johnson Controls GmbH
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Johnson Controls Technology Co
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
    • H01Q1/3233—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
    • H01Q1/3241—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems particular used in keyless entry systems

Definitions

  • the present invention relates to a low frequency radio transmission device which incorporates a driver circuit generating an excitation signal of a serial LC type antenna, a hands-free access system incorporating such a device, and a driver for use in such a device.
  • the invention finds applications, in particular, in the hands-free access systems (in English: "passive entry system") in particular for motor vehicles.
  • a radio transmission device may comprise a determined number N of transmission antennas, where N is an integer generally greater than unity, and at least one driver circuit (in English: “driver circuit”). whose function is to generate an excitation signal of the antenna or antennas (in English: “driver signal”).
  • the driver may be included in a management unit, which may be centralized or decentralized.
  • Each transmit antenna has an inductive coil, which may or may not be tuned. Depending on the case, it is said that the antenna is tuned or not.
  • a tuned antenna further comprises a tuning capacitor.
  • the antenna is LC series type when the inductor and the capacitor are connected in series. On the contrary, it is of parallel LC type when the inductance and the capacitor are connected in parallel.
  • An un-tuned antenna does not include a tuning capacitor. Nevertheless the inductive coil of the antenna is generally connected in series with at least one blocking capacitor of the continuous, and at least with parasitic capacitances. This is why, within the meaning of the invention and in the following, we also speak of LC type antenna series in this case.
  • the management unit may be included in a cockpit computer providing in particular the vehicle access control function and / or the start control function of the vehicle. vehicle.
  • the management unit includes a control module that generates a data signal, containing the data to be transmitted.
  • the transmitting antennas are distributed inside the passenger compartment, and / or at the outer periphery of the vehicle.
  • the excitation signal delivered to the transmitting antennas is functionally an interrogation signal of an identification element such as a badge or the like, which is worn by a user.
  • the badge is within the range of the interrogation signal (conventionally called the dialog box), it receives the interrogation signal and sends back an encoded response signal.
  • the management unit includes means for receiving and decoding this response signal to authenticate the user. In case of authentication, the management unit performs certain functions such as unlocking the opening of the vehicle and / or disabling a vehicle immobilizer.
  • the radio emission is said to low frequency (or LF, of the English "Low Frequency”), when the frequency of the interrogation signal is of the order of a few hundred kilohertz (kHz). Under these conditions, the propagation of the radio signal takes place in the near field. Since there is no electromagnetic radiation, compliance with electromagnetic compatibility (EMC) standards is not a problem. Such an emission must simply comply with the specifications of the IETS 300-330 (or EN 300-330) standard with regard to the spectrum of the transmitted signal. In a classic example in the automotive field, the fundamental frequency of the interrogation signal is equal to 125 kHz.
  • the management unit is said to be decentralized when it comprises a transmission antenna driving circuit, each generating an excitation signal of the corresponding antenna. These circuits are then each arranged close to the corresponding transmitting antenna.
  • the management unit is said to be centralized when it comprises a single driving circuit, which generates a single antenna excitation signal, as well as switching means for activating only one (or more) of the antennas. except for the others.
  • the excitation signal is then applied to the activated antenna only.
  • the figure 1 schematically illustrates the principle of the attack of a serial LC type transmitting antenna according to the prior art.
  • the transmitting antenna EA comprises an inductive coil L in series with a capacitor C.
  • the letter L designates both the coil and the value of its inductance.
  • the letter C denotes both the capacitor and the value of its capacitance.
  • this capacitance C corresponds to all the capacitors that exist in series with the coil L, in particular a tuning capacitor (if any), one or more DC blocking capacitors (if any), and the parasitic capacitance of the coil or other.
  • a GEN driver circuit comprises a square voltage generator 100.
  • this generator 100 comprises an ideal voltage source 101 in series with an internal resistor Rs.
  • the resistor Rs includes not only the internal resistance of the generator, but also the resistance inherent to the inductive coil L and the capacitors (if any), as well as the resistance of the links.
  • the positive terminal of the voltage source 101 is coupled to a first terminal of the antenna EA via the resistor Rs.
  • the negative terminal of the voltage source 101 and a second terminal of the antenna EA are coupled to a potential reference, for example the mass.
  • Source 101 is a voltage source that has a low internal impedance. We denote by U the amplitude of the voltage and the value of the current which are delivered by the source 101.
  • Fo the resonance frequency that satisfies this relation.
  • the intensity of the magnetic field emitted by the coil is proportional to M ⁇ i, where M denotes the number of turns of the coil L
  • M denotes the number of turns of the coil L
  • a transmission device having a high quality factor is conventionally obtained, as shown by the graph of FIG. figure 2 which illustrates the evolution of the current i as a function of the frequency F of the excitation signal generated by the driver circuit GEN.
  • the current i is maximum when the frequency F is equal to the resonance frequency Fo.
  • the curve shown is that of a "bell" function, very pointed.
  • the L and C values can vary in an uncontrolled manner. This involves a modification of the situation of the frequency F of the excitation signal generated by the drive circuit GEN with respect to the resonance frequency Fo of the device. It follows that the current i, and therefore the extent of the dialogue area can vary significantly. For example, for a quality factor greater than 30 (Q> 30), if i varies in a ratio of 1 to 2, then the size of the dialog box may vary by 20%.
  • the invention aims to overcome the disadvantages of the aforementioned prior art.
  • a first aspect of the invention thus relates to a low-frequency radio transmission device for a hands-free access system for a motor vehicle, comprising at least one serial LC-type transmission antenna, and at least one transmission circuit. attack delivering an excitation signal of the antenna at a frequency substantially equal to the resonant frequency of the antenna.
  • the driving circuit comprises a current generator for delivering the excitation signal as a current excitation signal.
  • the antenna is LC series type, it is energized current. This contradicts all the prejudices of those skilled in the art, according to which a serial LC-type antenna must be voltage-excited whereas a parallel LC-type antenna must be energized. But this gives the possibility of increasing the resistance of the device to reduce the quality factor, without penalizing the attack current of the antenna.
  • the driving circuit further comprises means for determining the internal resistance of the current generator. This reduces the quality factor of the device.
  • the resistance is sufficiently high that the quality factor is less than 10.
  • a quality factor of the order of 5 is preferred, taking into account the tolerated variation in the extent of the area. of dialogue.
  • a second aspect of the invention relates to a hands-free access system for a motor vehicle, comprising an identification badge worn by a user, and further comprising a low frequency radio transmission device according to the first aspect, for the transmission of an interrogation signal of the badge.
  • a third aspect of the invention relates to a driver circuit for use in a device according to the first aspect.
  • FIG 4 schematically is a top view of a motor vehicle 10.
  • a hands-free access system for such a vehicle comprises transmitting antennas which are arranged inside the passenger compartment and / or outside the vehicle 10. These antennas have the function of ensuring the transmission an interrogation signal which is adapted to be received by an identification member of the system, such as a badge 17 worn by a user, when the badge 17 is within the range of the signal range emitted by one of the antennas (dialogue zone).
  • an identification member of the system such as a badge 17 worn by a user
  • the badge 17 responds by sending back a response message, which is received by means of the access system placed on board the vehicle.
  • the response message is recognized as valid, it leads to the opening of the doors (function "passive entry”) and / or unlocking an immobilizer or even starting the vehicle (function "passive go”).
  • the interrogation signal is a low frequency signal (LF signal) for example equal to 125 kHz
  • the response signal is a radio frequency signal (RF signal, "radio frequency"), for example frequency equal to 433 MHz (megahertz).
  • LF signal low frequency signal
  • RF signal radio frequency signal
  • Hand access systems Free in accordance with this example are commonly called systems LF / RF in the jargon of the skilled person.
  • the emission of the response signal by the badge (RF signal) must comply with the specifications of the IETS 300-330 (or EN 300-330) standard.
  • the hands-free access system comprises five external transmitting antennas arranged at the outer periphery of the vehicle and which are associated with five dialogue zones 11 to 15 respectively. These dialogue areas extend from respectively , the left front door, the rear left door, the luggage compartment, the right rear door, and the right front door. External transmit antennas are dedicated to the "passive entry” function. Also, in the example, the system comprises a single internal transmitting antenna disposed inside the passenger compartment of the vehicle, which is associated with a dialogue zone 16 (represented by a corresponding discontinuous closed line in the figure). to the interior volume of the passenger compartment of the vehicle. The internal transmitting antennas are dedicated to the "passive go" function.
  • the system comprises a cockpit computer CU disposed in a strategic location of the vehicle 10.
  • the computer CU is powered by the battery 20 of the vehicle.
  • the system further comprises a determined number P of external transmit antennas EA1, EA2,..., EAp, where P is an integer. These antennas are disposed at the outer periphery of the vehicle 10 for example at the doors and the luggage compartment. They have a first and a second terminals connected to the calculator CU.
  • the system also includes one (or more) switch (s) LSW which is connected to the computer CU, such as an unlock button. This switch can be operated from outside the vehicle 10 by the user.
  • the system may also include an NP number of internal transmitting antennas EAp + 1, EAp + 2, ..., EAn, where N is an integer greater than P, disposed inside the passenger compartment of the vehicle . These antennas have a first and a second terminal connected to the computer CU. In the example illustrated by the figure 4 , P is equal to 5 and N is equal to 6 (NP is therefore equal to unity).
  • the system also includes an SSW switch such as a start button, which can be operated by the user while inside the vehicle only.
  • the external transmission antennas EA1 to EAp are series LC type antennas comprising an inductive coil (of inductance L) consisting of a winding wound around a ferrite bar in series with a capacitor (of capacitor C) consisting of parasitic capacitances or voluntarily added capacitors.
  • the internal transmission antennas EAp + 1 to EAn are, for example, air coils (antennae) of LC series type, comprising an inductive coil (of inductance L) consisting of a number of turns arranged on a suitable support, in series with a capacitor (of capacitance C) constituted by parasitic capacitances or voluntarily added capacitors.
  • the antennas may further include a tuning capacitor, arranged in series with the inductive coil.
  • DC blocking capacitors may be arranged in series with the antennas. For each antenna, the value of capacitance of capacitor C shown in the figure then includes the value of these capacitors.
  • the external transmitting antennas EA1 1 to EAp have the function of transmitting an interrogation signal 41 outside the vehicle, under the control of the computer CU, when the switch LSW is actuated.
  • the internal transmission antennas EAp + 1 to EAn have the function of transmitting the interrogation signal 41 inside the vehicle, under the control of the computer CU when the switch SSW is actuated.
  • the system also comprises Q actuators A1, A2,..., Aq, such as electric motors or the like, in some cases associated with an electromechanical and / or electro-pneumatic mechanism, where Q is a predetermined integer.
  • actuators A1, A2,..., Aq such as electric motors or the like, in some cases associated with an electromechanical and / or electro-pneumatic mechanism, where Q is a predetermined integer.
  • These actuators are controlled by the computer CU to perform certain functions such as unlocking the doors and / or deactivating a vehicle immobilizer 10.
  • the system comprises a reception antenna 31 disposed in the vehicle 10 and coupled to the computer CU via reception means 30.
  • the function of the antenna 31 is to receive a response signal 42 which is transmitted by the badge 17 upon receipt. of the interrogation signal 41 transmitted by one of the external transmission antennas EA1 to EAp, or by one of the internal transmission antennas EAp + 1 to EAn.
  • the badge 17 comprises a control unit 176 such as a microcontroller. It also includes a receiving antenna 172 for receiving the interrogation signal 41, which is coupled to the control unit 176 via receiving means 171. It further comprises a transmit antenna 174, which is coupled to the control unit 176 by transmission means 173. The control unit 176 and the means 171 and 173 are powered by a battery 175 such as a battery.
  • the transmission antenna 174 has the function of transmitting the response signal 42, under the control of the control unit 176, when a valid interrogation signal 41 is received by the reception antenna 172 and decoded. by unit 176.
  • the scheme of the figure 6 illustrates an exemplary management unit for managing the transmission of the interrogation signal by a determined number N of antennas of a device according to the invention, for example in a system according to the figure 5 .
  • the management unit 500 delimited by a discontinuous closed line, is centralized. It comprises a single GEN driver circuit, which generates a single antenna excitation signal SC, as well as switching means for activating only one (or more) of the antennas with the exception of the others.
  • the management unit 500 comprises a control module CTRL, the drive circuit GEN, and the switching means DEMUX.
  • the circuit GEN receives a data signal Sd delivered by the module CTRL, and generates the excitation signal SC.
  • the DEMUX switching means are, for example, a demultiplexer having an IN input, and N outputs respectively OUT1 to OUTn.
  • the excitation signal SC is delivered on a respective first terminal of each of the antennas EA1 to EAn, via a respective first link whose length can reach a few meters.
  • the switching means DEMUX are arranged between a respective second terminal. each of the antennas EA1 to EAn, on the one hand, and a reference potential, for example ground, on the other hand.
  • the IN input of the DEMUX demultiplexer is connected to ground.
  • the outputs OUT1 to OUTn of the DEMUX demultiplexer are connected to said respective second terminal of each of the antennas, respectively EA1 to EAn, via a respective second link whose length is substantially identical to that of the first link, ie that can also reach a few meters.
  • the DEMUX demultiplexer comprises a determined number N of switches, respectively SW1 to SWn, which are each arranged between the input IN and one of the outputs OUT1 to OUTn, respectively.
  • the control module CTRL generates a selection signal SEL which is delivered to the DEMUX demultiplexer.
  • This signal has the function of controlling the closing of only one of the switches SW1 to SWn, that is to say the selection of only one of the outputs OUT1 to OUTn of the DEMUX demultiplexer which is coupled to the input IN via one of said switches.
  • the selection signal SEL makes it possible to activate only one of the antennas EA1 to EAn, the others being deactivated. Note that it is not excluded that, in some applications, several transmit antennas are activated simultaneously.
  • Such an arrangement of the switching means results in switching the transmit antennas "cold point".
  • the electrical connections connecting the GEN drive circuit to the antennas which are deactivated, although being in open circuit, are permanently subject to the excitation signal SC.
  • These links can be more or less strongly coupled to ground via parasitic capacitances, the risk exists that one or more deactivated antennas are still traversed by the current of the excitation signal, and transmit the interrogation signal at a frequency offset from the fundamental frequency of the excitation signal.
  • F 'happens to be a harmonic frequency of the frequency Fo, if the excitation signal has a high harmonic rate, as is the case with square signals. of the prior art.
  • the spectrum of such a signal contains not only the fundamental frequency Fo but all the harmonic frequencies thereof.
  • the excitation signal SC of the antennas is a preferably sinusoidal or quasi-sinusoidal signal LF.
  • the low harmonic content of such an excitation signal makes it possible to avoid the aforementioned risk of accidental resonance of the antenna. The risk of erratic operation of the hands-free access system is thus avoided.
  • the management unit 500 is advantageously included in the cockpit calculator CU.
  • the antenna EA is a series LC type antenna, that is to say comprising an inductive coil L in series with a capacitor C, tuning capacity and / or one or more blocking capacitors of the continuous.
  • the inductive coil L of the antenna EA is unmatched, i.e., it is not connected in series with a tuning capacitor.
  • a drive circuit GEN outputs an excitation signal SC for excitation of the antenna EA, as a current excitation signal.
  • This driving circuit comprises a current generator 600 which, according to the Norton model, comprises an ideal current source 601 in parallel with an internal resistance Ri.
  • the positive terminal of the current source 601 is coupled to a first terminal of the antenna EA.
  • the negative terminal of the current source 601 and a second terminal of the antenna EA are coupled to ground.
  • the current generator delivers a current Io.
  • the excitation signal SC is preferably a sinusoidal or quasi-sinusoidal signal. Indeed, as already mentioned above, this feature limits the effects on the operation of the system, the parasitic coupling of the links to the ground.
  • a centralized management unit has been described above with respect to the diagram of the figure 6 .
  • the drive circuit GEN may furthermore comprise means arranged to increase the value of the internal resistance Ri of the current generator 600.
  • the diagram of FIG. figure 8 symbolically illustrates such a variant of the GEN driver circuit.
  • an additional resistor Rp connected in series with the internal resistance Ri of the current generator 600.
  • the resistor Rp makes it possible to determine the value of the internal resistance Ri.
  • a high value of the internal resistance of the current generator 600 can be obtained by a suitable architecture of the generator.
  • the value of the current Io is chosen taking into account the internal resistance of the current generator 600, so as to obtain an excitation current of desired amplitude in the antenna EA.
  • the quality factor of the device is less than 10.
  • it is arranged to be of the order of 5.
  • the scheme of the figure 9 illustrates another variant in which the drive circuit GEN comprises a voltage follower stage 602 disposed at the output of the current generator 600 and having a determined current gain Gi.
  • the gain Gi is greater than unity (Gi> 1).
  • This variant is recommended in the case where a high excitation current is required, that is to say in applications requiring a high transmission power.
  • Such a stage makes it possible to limit the value of the current Io and thus makes it possible to limit the thermal losses in the current generator 600.
  • the current source 601 and the internal resistance Ri are then seen on the load side (the antenna EA). , as a current source Gi x Io, and as a resistor Ri / Gi, respectively.
  • the voltage follower stage 602 is disposed between a terminal 603 brought to the potential of the supply voltage Vbatt delivered by the battery, on the one hand, and the ground on the other hand.
  • This is, for example, a class B push-pull power stage.
  • this is only a preferred but in no way limiting example.
  • the current generator 600 comprises for example a voltage generator followed by a transconductance amplifier.
  • the current generator 600 comprises a low frequency sinusoidal oscillator 71, delivering a sinusoidal signal Sm, which is a signal LF having a frequency Fo. It further comprises a variable gain amplifier 74 whose input receives the signal Sm and the output of which delivers the excitation signal SC.
  • the amplifier 74 is a transconductance amplifier.
  • the signal Sm that it receives is a voltage signal
  • the signal it delivers is a current signal, namely the current noted Io at Figures 7 to 9 . This current excites the inductive coil of the antenna that is activated.
  • a control input of the amplifier 74 receives the data signal Sd, which is a square LF signal.
  • the signal Sd contains the data to be transmitted in the form of Manchester encoding.
  • the gain of the amplifier 74 is for example equal to zero when the signal Sd is in the low state and it has a non-zero value when the signal Sd is in the high state.
  • the signal Io thus corresponds to the signal Sm modulated by the signal Sd.
  • the current generator 600 comprises a low frequency oscillator 72 generating a square signal Sck, which is a signal LF having a fundamental frequency Fo which is for example equal to 125 kHz.
  • the signal Sck is a clock signal delivered by an output of a microcontroller included in the control circuit CTRL.
  • the signal Sck is filtered by a low-pass filter 73 to generate the signal Sm.
  • the signal Sm is then a quasi-sinusoidal signal, which is a signal LF having a fundamental frequency Fo.
  • the filter 73 is at least third order. Its cutoff frequency is for example equal to 80 kHz or 100 kHz.
  • the rest of the current generator 600 is identical to the circuit according to the first exemplary embodiment, in accordance with the diagram of FIG. figure 10 .
  • the signal Sck can be modulated in pulse width, which makes it possible to control the attack current of the antennas, that is to say the current flowing in the activated antenna.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Lock And Its Accessories (AREA)
  • Details Of Aerials (AREA)
  • Near-Field Transmission Systems (AREA)

Claims (13)

  1. Niederfrequenz-Funkübertragungsvorrichtung für eine passive Fahrzeugalarmanlage mit mindestens einer Sendeantenne (EA, EA1-EAn) vom LC-Serien Typ und mindestens einem Treiber (GEN), der ein Erregersignal (SC) zum Erregen der Antenne in einer Frequenz abgibt, die ungefähr der Resonanzfrequenz der Antenne entspricht, dadurch gekennzeichnet, dass der Treiber einen Stromgenerator (600) zum Abgeben des Erregersignals als Strom-Erregersignal umfasst.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Sendeantenne vom LC-Serien Typ eine nicht abgestimmte induktive Spule (L) enthält.
  3. Vorrichtung nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, dass das Erregersignal (SC) ein Sinussignal oder Quasi-Sinussignal ist.
  4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Treiber Mittel (Rp) zur Bestimmung des Innenwiderstands (Ri) des Stromgenerators umfasst.
  5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass der Gütefaktor der Vorrichtung kleiner als 10 ist.
  6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Stromgenerator einen Spannungsgenerator (71;72) umfasst, an den sich ein Transkonduktanz-Verstärker (74) anschließt.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass der Spannungsgenerator eine Spannungsquelle (71) umfasst, die eine Sinusspannung (Sm) abgibt.
  8. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass der Spannungsgenerator eine ein Rechtecksignal (Sck) abgebende Spannungsquelle (72) umfasst, an die sich ein Tiefpaßfilter (73) anschließt, wobei diese zusammen eine Quasi-Sinusspannung (Sm) abgeben.
  9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass das Rechtecksignal (Sck) bezüglich der Impulsbreite moduliert wird, um den Stromwert in der Antenne zu steuern.
  10. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Treiber eine Spannungsfolgerstufe (602) umfasst, die am Ausgang des Stromgenerators angeordnet ist und eine bestimmte Stromverstärkung (Gi) aufweist, die größer als 1 ist.
  11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass die Spannungsfolgerstufe eine Klasse B-Leistungsstufe vom Push-Pull Typ ist.
  12. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie eine bestimmte Anzahl N an Sendeantennen (EA1-EAn) umfasst, wobei N eine ganze Zahl größer 1 ist und dass sie zudem eine zentrale Verwaltungseinheit (500) umfasst mit:
    - dem Treiber (GEN), der ein eindeutiges Erregersignal (SC) zum Erregen der Antennen erzeugt, das an einen ersten Anschluss jeder Antenne abgegeben wird;
    - Schaltmitteln (DEMUX), die eine bestimmte Anzahl N an Schaltern (SW1-SWn) umfassen, die jeweils mit einer der genannten Antennen verbunden sind, die zwischen einem zweiten Anschluss der Antenne und einem Bezugspotential angeordnet sind, wobei jeder der genannten Schalter durch die Verwaltungseinheit gesteuert wird, um die verbundene Antenne zu aktivieren oder zu deaktivieren.
  13. Vorrichtung für eine passive Fahrzeugalannanlage, die eine Identifikationsmarke (17) umfasst, die von einem Benutzer getragen wird, dadurch gekennzeichnet, dass sie eine Niederfrequenz-Funkübertragungsvorxichtung (500) nach einem der Ansprüche 1 bis 12 zur Übertragung eines Abfragesignals (41) der Marke umfasst.
EP03760762A 2002-06-24 2003-06-20 Niederfrequenz-funkübertragungseinrichtung für eine fahrzeugalarmanlage Expired - Lifetime EP1516389B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0207792A FR2841393B1 (fr) 2002-06-24 2002-06-24 Dispositif d'emission radioelectrique basse frequence pour systeme d'acces mains libres pour vehicule automobile
FR0207792 2002-06-24
PCT/FR2003/001903 WO2004001897A1 (fr) 2002-06-24 2003-06-20 Dispositif d'emission radioelectrique basse frequence pour systeme d'acces mains libres pour vehicule automobile

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EP1516389A1 EP1516389A1 (de) 2005-03-23
EP1516389B1 true EP1516389B1 (de) 2008-06-04

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EP (1) EP1516389B1 (de)
JP (1) JP4221362B2 (de)
AU (1) AU2003255686A1 (de)
DE (1) DE60321464D1 (de)
FR (1) FR2841393B1 (de)
WO (1) WO2004001897A1 (de)

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JP4899941B2 (ja) * 2007-03-05 2012-03-21 パナソニック電工株式会社 質問器、応答器、及び、無線認証システム
DE102008012606B4 (de) 2008-03-05 2019-07-04 Continental Automotive Gmbh Passives drahtloses Zugangssystem mit einem Ortungssystem und Verfahren zum Herstellen und Betreiben des Systems
DE102009002448A1 (de) * 2009-04-16 2010-10-21 Huf Hülsbeck & Fürst Gmbh & Co. Kg Verfahren zur Sicherung einer Keyless-Entry-Kommunikation für Kraftfahrzeuge
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JP3712834B2 (ja) * 1997-06-24 2005-11-02 アルプス電気株式会社 キーレスエントリー装置
FR2778980B1 (fr) * 1998-05-22 2001-04-20 Valeo Securite Habitacle Dispositif electromecanique a detecteurs de position, en particulier pour commande de serrure electrique de vehicule automobile

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FR2841393B1 (fr) 2006-05-05
AU2003255686A1 (en) 2004-01-06
JP4221362B2 (ja) 2009-02-12
FR2841393A1 (fr) 2003-12-26
DE60321464D1 (de) 2008-07-17
JP2005536911A (ja) 2005-12-02
EP1516389A1 (de) 2005-03-23
WO2004001897A1 (fr) 2003-12-31

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