EP1972026B1 - Système d antennes, système de contrôle d accès pour un véhicule automobile et procédé de diagnostic - Google Patents

Système d antennes, système de contrôle d accès pour un véhicule automobile et procédé de diagnostic Download PDF

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Publication number
EP1972026B1
EP1972026B1 EP06840880A EP06840880A EP1972026B1 EP 1972026 B1 EP1972026 B1 EP 1972026B1 EP 06840880 A EP06840880 A EP 06840880A EP 06840880 A EP06840880 A EP 06840880A EP 1972026 B1 EP1972026 B1 EP 1972026B1
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EP
European Patent Office
Prior art keywords
antenna
reference point
antenna system
diagnosis
individual
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.)
Expired - Fee Related
Application number
EP06840880A
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German (de)
English (en)
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EP1972026A1 (fr
Inventor
Andreas Russ
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Conti Temic Microelectronic GmbH
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Conti Temic Microelectronic GmbH
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Publication date
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Publication of EP1972026A1 publication Critical patent/EP1972026A1/fr
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Expired - Fee Related legal-status Critical Current
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Classifications

    • 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
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks

Definitions

  • the invention relates to an antenna system having a plurality of individual antennas connected in each case in a separate drive path, to which a common signal generator is assigned, and to a drive unit provided for the selective connection of a respective selected drive path. It further relates to an access control system for a motor vehicle with such an antenna system and to a method for determining a faulty individual antenna in such an antenna system.
  • motor vehicles can be equipped with so-called "keyless entry" systems in which using a transponder or a mobile identification transmitter keyless opening and closing the central locking and possibly also a release of the immobilizer can be done.
  • a control system of the motor vehicle communicates via coded signals with the respective identification transmitter, for example, after receiving appropriate signals from the information provider and their evaluation in the case of a positive identification of an authorized user appropriate releases of the central locking and / or to release the immobilizer or the like granted can.
  • the control system For communication with the identification transmitter or transponder, the control system transmits suitable signals to the latter.
  • the signal transmission is usually carried out via a suitable, integrated into the motor vehicle antenna system. Due to the variety of applications and the individual cases to be considered usually a multi-channel antenna system is provided in which a A plurality of demand-designed and possibly also arranged in the motor vehicle, each connected in a separate drive path individual antennas are used.
  • the individual antennas may, for example, on the one hand so-called interior and on the other hand so-called outdoor space antennas, which can be determined via an interior antenna due to their arrangement in the motor vehicle, their range and the like, whether the respective identification transmitter or transponder is currently straight located in the vehicle interior.
  • the individual antenna provided for this purpose is designed with regard to dimensioning and positioning for communication with the identification transmitter or transponder in the event that it is located in the exterior of the vehicle.
  • a plurality of such, specialized antennas in the antenna system can also be provided both in the interior space and in the outdoor area.
  • An antenna system of this type in which the individual antennas a common signal transmitter for on-demand communication with the identification transmitter or transponder is assigned, wherein a selective activation or connection of a situation-dependent desired individual antenna is provided by selecting their respective An Kunststoffpfad via a central drive unit, for example, from DE 10234605 or EP 1817816 B1 known.
  • EP 1817816 it is only published after the priority date of this application and is thus only state of the art under Article 53 (3) EPC. According to the system EP 1817816 B1 is particularly with relatively simple means a reliable loading of the antennas with transmission signals allows, with unwanted coupling or crosstalk can be reliably avoided.
  • the invention is therefore the object of developing an antenna system of the type mentioned above such that in the event of an error in a particularly simple manner reliable identification of a faulty individual antenna is possible. Furthermore, a particularly favorable method for determining a faulty individual antenna in such an antenna system is to be specified.
  • each drive path between the signal transmitter and the respective individual antenna is electrically connected via an associated isolating diode to a common first reference point provided for tapping a diagnostic potential as required.
  • the invention is based on the consideration that for a particularly simple and determined identification of a faulty individual antenna, the error type or the type of fault should first be determined jointly for all individual antennas, so that in a subsequent second step on the basis of the detected type of fault a particularly targeted Identification of each faulty individual antenna can be done. Accordingly, in the manner of a group diagnosis, a suitable inference for all individual antennas should be drawn together on the basis of the present error type.
  • shortcomings of the respective individual antenna to the supply voltage, short circuit of the respective individual antenna to ground or a so-called "open-load" state, ie interruption of the electrical connection within the respective antenna come into consideration as error types.
  • To detect the error type is therefore provided in a first step, to determine for all individual antennas together, if possibly as an error type could be a short circuit to the supply voltage.
  • all the individual antennas on the input side ie in the region of their so-called antenna positive pole, are electrically connected to one another and to a reference point, via which a short circuit to the supply voltage can be ascertained.
  • the electrical potential of the reference point is then measured in relation to ground in the no-load state. If it is found between the reference point, which is preferably connected to ground via a suitable resistor, and ground an applied voltage greater than zero, it can be concluded as an error type to short circuit to the supply voltage.
  • the electrical decoupling of the individual antennas should be guaranteed in case of operation, the isolating diodes are provided which prevent crosstalk of the individual drive paths to each other in case of operation.
  • the antenna system should continue to be designed so that in the manner of a group diagnosis for the other possible types of errors, namely short circuit to ground and "open-load" state, a reliable Typerkennung is possible before the identification of each faulty individual antenna takes place .
  • each drive path between the signal transmitter and the respective individual antenna is electrically connected via an associated feed-in separating diode to a common contact point provided for applying a test voltage as required.
  • a test voltage is applied to the contact point, a voltage with respect to ground should also be measurable in the case of a fault-free installation even at the first reference point. Only in the case of a short circuit to ground is this voltage equal to zero even when the test voltage is applied.
  • the feed-in isolating diode is preferably connected in the connection between the drive path and the contact such that the connection corresponds to the contact point drive path of the forward direction and the connection to the drive direction contact point corresponds to the reverse direction of the feed-in separating diode.
  • each drive path in the return region of the respective individual antenna ie in the region of the so-called negative pole of the respective individual antenna, is advantageously also electrically connected to a common second reference point provided for the demanded tapping of a diagnostic potential an associated isolation diode connected.
  • the antenna current of the individual antennas can be measured in a particularly simple manner via the tap of the diagnostic potential at the second reference point, which in turn is electrically connected to ground via a suitable resistor, which is a particularly suitable criterion for verifying a short circuit to ground or for identification an "open-load" state can be used.
  • the selective control of the separately held drive paths and thus the respective individual antennas can be done for example by suitably designed relay arrangements or by suitably selected signal generator.
  • a particularly simple and reliable control of the individual drive paths and thus the individual antennas when using a common signal generator can be achieved by the drive unit is formed as a multiplexer, preferably as a multiplexer transistor or shunt multiplexer in a particularly advantageous embodiment.
  • the antenna system is used in an access control system for a motor vehicle, wherein the signal exchange of a vehicle integrated control system with a mobile identification transmitter via said antenna system.
  • the stated object is achieved by determining a general type of fault in a first diagnostic step by measuring a diagnostic potential at the first reference point and optionally at the second reference point.
  • the basic recognition of the error type is guaranteed in the manner of a group diagnosis in a first diagnostic step, so that in the subsequent individual diagnostic steps in which the individually faulty antenna is determined, a test program adapted to the currently present error type can be performed.
  • a potential greater than zero is present at the first reference point, it is possible to deduce the type of fault of a short circuit to the supply voltage. However, if a non-zero diagnostic voltage at the first reference point can not be determined, then a non-zero test voltage can be applied to the positive poles of the individual antennas.
  • a diagnostic potential that differs from zero should also be present at the first reference point in the error-free state. If, however, a diagnosis potential of zero is measured in this state at the first reference point, then in the step of the group diagnosis it can be concluded that there is a short circuit to ground as an error type.
  • each drive path is advantageously selected sequentially via the drive unit and subjected to suitable test signals, for example a signal from the signal generator.
  • the advantages achieved by the invention are in particular that a reliable identification of a single antenna is made possible for an antenna system of the type mentioned by the orientation of the error detection on a group diagnosis in a particularly simple design and low component costs.
  • the isolating diodes which ensure a reliable decoupling of the individual drive paths from one another, the upstream of the entire antenna system determination of the respective error type and only then an individualized troubleshooting using particularly suitable test measures is possible.
  • This makes it possible to fully diagnose the individual antennas of the antenna system with particularly low component expenditure and also requires only a small amount of space on the respective component boards.
  • diagnosticability is also possible for other multi-channel antenna systems, in which the individual antennas are acted upon by suitable single signal generator at the positive or negative pole.
  • the access control system 1 is provided for wireless authorization on access or for the operation of a motor vehicle 2 and can be configured in particular as a so-called "keyless entry" system for keyless opening and closing of the central locking of the motor vehicle 2.
  • the access control system 1 comprises a mobile identification transmitter 4, which exchanges signals with a control system 6 arranged in the motor vehicle 2 by wireless means, for example via a suitably selected radio link.
  • the control system 6 comprises an integrated, unspecified evaluation module, in which a code of the received signal is evaluated individually by means of appropriately stored software, in the case of a positive result of this evaluation of the received signals to a correct identification and thus to an authorization of User is closed. If such authorization is recognized, for example, the central locking of the motor vehicle 2 is activated.
  • the access control system 1 is therefore among others designed to distinguish due to the communication of the control system 6 with the mobile identification transmitter 4 between different states, which are assigned different release permissions.
  • the access control system 1 comprises, inter alia, a plurality of antennas, via which the communication with the mobile identification transmitter 4 is handled. If it is determined, for example, that the communication with the mobile identification transmitter 4 takes place via an interior antenna of the access control system 1, it is possible to actively suppress the closing of the vehicle doors.
  • the control system 6 is therefore provided with a multi-channel antenna system 10, as shown schematically in FIG FIG. 2 is shown.
  • the antenna system 10 comprises a plurality of individual antennas 14 each connected in a separate drive path 12, of which in the exemplary embodiment according to FIG FIG. 2 for the sake of clarity, only two are shown.
  • the antenna system 10 can also comprise more than two, for example five, eight or more, separate drive paths 12 with corresponding individual antennas 14.
  • a common signal generator 16 which may include in addition to a signal generator 18 for the intended signal data, protocols or the like other components such as a coupling coil 20 and in the respective An Kunststoffpfad 12 coupling capacitors 21 or the like.
  • a drive unit 22 is further provided, which is formed in the embodiment as a multiplexer, in particular as a multiplexer transformer or shunt multiplexer.
  • the signal generator 16 and the drive unit 22 are within of the respective drive path 12 are respectively connected via the resistor 28 to the so-called positive pole 24 of the respective individual antenna 14.
  • each individual antenna 14 is connected within its Anêtpfads 12 each with a separating capacitor 30 which separates the negative pole 26 of the respective individual antenna 14 from ground.
  • the serving to adjust the Antennenschigüte resistor 28 can also be moved in the respective drive path 12 in front of said separation capacitor 30.
  • the coupling capacitor 21 and the separating capacitor 30 are components of the antenna circuit (21, 14, 28, 30).
  • the antenna system 10 is designed for the case of failure, ie in the case of failure of one or more of the individual antennas 14, for a particularly targeted and simple error detection and identification of the faulty individual antenna 14.
  • each drive path 12 in the region of the positive pole 24 of the respective individual antenna 14, that is to say between the signal generator 16 and the respective individual antenna 14, is electrically connected to a common first reference point 34 via an associated readout separating diode 32.
  • the first reference point 34 is connected via a resistor 36 to ground.
  • the readout separating diodes 32 are connected in such a way that the connection from the drive path 12 to the first reference point 34 of the forward direction and the connection from the first reference point 34 to the drive path 12 corresponds to the separation direction of the readout isolation diode 32.
  • each individual antenna 14 ie the area between the signal generator 16 and the respective individual antenna 14 of each control path 12 is electrically connected to a common contact point 44 via an associated feed-in separating diode 40 and a resistor 42.
  • the feed-separating diodes 40 are connected in such a way that the connection from Contact point 44 to the respective drive path 12 of the forward direction and the connection from the respective drive path 12 to the contact point 44 of the separation direction of the respective feed-in separating diode 40 corresponds.
  • each drive path 12 of the respective individual antennas 14 is electrically connected to a common second reference point 52 via an associated readout separation diode 50.
  • the second reference point 52 is connected via a resistor 54 to ground.
  • the read-out isolating diodes 50 are in turn connected in such a way that the connection from the drive path 12 to the second reference point 52 corresponds to the forward direction and the connection from the second reference point 52 to the drive path 12 corresponds to the reverse direction of the respective readout isolation diode.
  • the antenna system 10 is designed for a step-by-step diagnosis, in which the present error type is first determined jointly for all individual antennas 14 in a first diagnostic step in the manner of a group diagnosis before in a second diagnostic step, the faulty individual antenna 14 is determined on the basis of the determined error type on the basis of suitable test measures.
  • the error types "short circuit to the supply voltage”, “short circuit to ground” and “open load” state are used as the error types, the "open load” state of an electrical severing of the respective individual antenna 14, ie a defective electrical connection between the positive pole 24 and the negative pole 26 of the respective individual antenna 14, corresponds.
  • a test scheme As shown in the flowchart according to FIG. 3 is shown.
  • a first test step 60 in a no-load condition, ie with inactive signal transmitter 16 and inactive drive unit 22, it is determined whether a voltage between the first reference point 34 and ground can be measured as the diagnosis potential. If this is the case, the error type is "supply short circuit" as a result of the group diagnosis.
  • each driving path 12 is then activated sequentially in the context of the individual diagnosis via the drive unit 22 sequentially by connecting the coupling capacitor 21 to the drive path 12 in each case to ground. If an error-free individual antenna 14 of the respective drive path 12 is thereby switched on, then the voltage measured between the first reference point 34 and ground as diagnosis potential is not changed because of the decoupling by the readout separating diodes 32. If, on the other hand, the drive path 12 with the faulty individual antenna 14 is actuated via the drive unit 22, then the voltage measured as the diagnosis potential at the first reference point 34 approaches zero due to the ground coupling of the multiplexer. As soon as this case occurs, the currently activated individual antenna 14 is thus identified as the faulty individual antenna 14.
  • a test voltage is applied to the contact point 44 in the course of the group diagnosis in a subsequent test step 62. Subsequently, it is checked whether a voltage between the first reference point 34 and ground can now be measured as a diagnosis potential. If no voltage between the first reference point 34 and ground can be measured, the error type "short to ground" is closed in the group diagnosis. In this case, it can now be determined in the context of the following individual diagnosis, which of the individual antennas 14 has the short circuit to ground.
  • a continuous signal is output via the signal generator 16. Subsequently, via the drive unit 22 sequentially switched on the An Kunststoffpfade 12 selectively.
  • a check is made at the second reference point 52 as to whether a voltage with respect to ground can be detected as the diagnosis potential. This voltage would then correspond to the antenna current through the respective individual antenna 14. If such an antenna current, corresponding to a voltage between the second reference point 52 and ground, can be measured, the proper operation of the respective individual antenna 14 is concluded. On the other hand, if the antenna current is equal to zero, then the currently connected individual antenna 14 is identified as a faulty individual antenna 14.
  • the error type "Open Load” is assumed to end the group diagnosis.
  • a sequential check is made as to whether a corresponding antenna current can be detected when the respective individual antenna 14 is acted upon by a test pulse.
  • a continuous signal is in turn output via the signal generator 16.
  • all the drive paths 12 are selectively switched on via the drive unit 22, wherein in each case for the current individual antenna 14 by means of a voltage measurement between the second reference point 52 and ground is checked whether an antenna current is detectable. If a voltage between the second reference point 52 and ground can not be measured for a single antenna 14 as a diagnosis potential, then the current individual antenna 14 is identified as a faulty individual antenna 14.
  • FIG. 4 an alternative antenna system 70 is shown in which there is also a multi-channel structure, but each drive path 12 is assigned a separate signal generator 18 each.
  • the group diagnosis is carried out essentially analogously to the antenna system 10, wherein the individual diagnoses by selective transmission via individual antennas 14, ie via selective activation of the individual signal generator 18, and signal reset at the reference point 52 takes place.
  • FIG. 5 A flow chart for performing the diagnosis in this antenna system is in FIG. 5 shown.

Claims (7)

  1. Système d'antennes (10, 11) avec une pluralité d'antennes individuelles (14) connectées respectivement dans un chemin d'excitation (12) séparé, auxquelles un générateur de signaux (16) commun est dédié, et avec une unité d'excitation (22) prévue pour la mise sous tension sélective d'un chemin d'excitation (12) sélectionné à chaque fois,
    caractérisé en ce que
    chaque chemin d'excitation (12) entre le générateur de signaux (16) et l'antenne individuelle (14) respective est relié électriquement par une diode séparatrice de tri (32) dédiée avec un premier point de référence (34) commun prévu pour la prise d'un potentiel de diagnostic, en fonction de la demande.
  2. Système d'antennes (10, 11) selon la revendication 1,
    caractérisé en ce que
    chaque chemin d'excitation (12) entre le générateur de signaux (16) et l'antenne individuelle (14) respective est relié électriquement par une diode séparatrice d'alimentation (40) dédiée avec un point de contact (44) commun prévu pour l'application d'une tension de contrôle, en fonction de la demande.
  3. Système d'antennes (10, 11) selon les revendications 1 ou 2,
    caractérisé en ce que
    chaque chemin d'excitation (12) dans le circuit de retour de l'antenne individuelle (14) respective est relié électriquement par une diode séparatrice de tri (50) dédiée avec un deuxième point de référence (52) commun prévu pour la prise d'un potentiel de diagnostic, en fonction de la demande.
  4. Système d'antennes (10, 11) selon l'une des revendications 1 à 3,
    caractérisé en ce que
    l'unité d'excitation (22) est configurée comme un multiplexeur.
  5. Système de contrôle d'accès (1) pour un véhicule à moteur (2) sur lequel un système de contrôle (6) prévu pour l'échange de signaux avec un générateur d'identification (4) mobile est équipé d'un système d'antennes (10, 11) selon l'une des revendications 1 à 4.
  6. Procédé pour la détermination d'une antenne individuelle (14) défectueuse sur un système d'antennes (10, 11) selon l'une des revendications 1 à 4, sur lequel un type d'erreur général est déterminé lors d'une première étape de diagnostic par le mesurage d'un potentiel de diagnostic au premier point de référence (34) et, le cas échéant, au deuxième point de référence (52).
  7. Procédé selon la revendication 6, sur lequel, après la détermination du type d'erreur, l'antenne individuelle (14) défectueuse est déterminée lors d'une deuxième étape de diagnostic par l'excitation sélective et l'évaluation dédiée du potentiel de diagnostic respectif.
EP06840880A 2006-01-09 2006-12-22 Système d antennes, système de contrôle d accès pour un véhicule automobile et procédé de diagnostic Expired - Fee Related EP1972026B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006001324 2006-01-09
PCT/DE2006/002300 WO2007079711A1 (fr) 2006-01-09 2006-12-22 Système d’antennes, système de contrôle d’accès pour un véhicule automobile et procédé de diagnostic

Publications (2)

Publication Number Publication Date
EP1972026A1 EP1972026A1 (fr) 2008-09-24
EP1972026B1 true EP1972026B1 (fr) 2009-03-11

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EP06840880A Expired - Fee Related EP1972026B1 (fr) 2006-01-09 2006-12-22 Système d antennes, système de contrôle d accès pour un véhicule automobile et procédé de diagnostic

Country Status (4)

Country Link
US (1) US8140032B2 (fr)
EP (1) EP1972026B1 (fr)
DE (2) DE112006000659A5 (fr)
WO (1) WO2007079711A1 (fr)

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DE102008031406B4 (de) * 2008-07-02 2015-12-31 Frank Schmidt Empfängervorrichtung, Verwendung einer Empfängervorrichtung, System sowie Verfahren zum energiearmen Empfang von Daten
DE102009037497B4 (de) * 2009-08-13 2012-04-12 Predrag Stevanovic Diagnosevorrichtung für schlüsselloses Zugangssystem
JP5685073B2 (ja) * 2010-12-17 2015-03-18 株式会社東海理化電機製作所 電子キーシステム
US9512643B1 (en) * 2013-11-14 2016-12-06 Josh Keefe Door unlocking systems and methods
US10712377B2 (en) * 2016-06-30 2020-07-14 Ge Aviation Systems Llc Antenna diagnostics for wireless communication unit for communicating engine data
FR3059437B1 (fr) * 2016-11-30 2019-01-25 Continental Automotive France Procede de diagnostic d'un lien de communication dans un vehicule automobile
FR3074379B1 (fr) 2017-11-24 2020-11-13 Continental Automotive France Lecteur d'authentification pour ouvrant de vehicule automobile

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EP1817816A1 (fr) * 2004-12-04 2007-08-15 Contitemic Microelectronic GmbH Dispositif d'emission destine a plusieurs antennes paralleles entre elles, qui peuvent etre alimentees independamment les unes des autres par une ligne d'alimentation respective

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DE4221196A1 (de) * 1992-06-27 1994-01-05 Teves Gmbh Alfred Schaltungsanordnung zur Überwachung einer induktiven Schaltung
DE19923729A1 (de) * 1999-05-22 2000-11-23 Nokia Mobile Phones Ltd Schaltungsanordnung zum Prüfen der Funktionsbereitschaft mindestens einer Antenne
DE10004616B4 (de) 2000-02-03 2008-06-19 Siemens Ag Schaltungsanordnung für eine Sende- und/oder Empfangseinrichtung
DE10059179C1 (de) 2000-11-29 2002-06-13 Siemens Ag Schaltungsanordnung für eine Antennenanordnung und Verfahren zum Schalten einer Antennenanordnung
FR2828286B1 (fr) 2001-08-02 2003-11-21 Siemens Automotive Sa Dispositif de diagnostic pour une antenne
FR2841392B1 (fr) 2002-06-24 2004-09-17 Johnson Contr Automotive Elect Dispositif d'emission radioelectrique ayant une unite de gestion centralisee et une pluralite d'antennes d'emission distantes
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EP1817816A1 (fr) * 2004-12-04 2007-08-15 Contitemic Microelectronic GmbH Dispositif d'emission destine a plusieurs antennes paralleles entre elles, qui peuvent etre alimentees independamment les unes des autres par une ligne d'alimentation respective

Also Published As

Publication number Publication date
DE502006003146D1 (de) 2009-04-23
EP1972026A1 (fr) 2008-09-24
DE112006000659A5 (de) 2007-12-27
US8140032B2 (en) 2012-03-20
WO2007079711A1 (fr) 2007-07-19
US20080309566A1 (en) 2008-12-18

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