EP1004726A2 - Method for unlocking an object, especially a motor vehicle - Google Patents

Method for unlocking an object, especially a motor vehicle Download PDF

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Publication number
EP1004726A2
EP1004726A2 EP99122806A EP99122806A EP1004726A2 EP 1004726 A2 EP1004726 A2 EP 1004726A2 EP 99122806 A EP99122806 A EP 99122806A EP 99122806 A EP99122806 A EP 99122806A EP 1004726 A2 EP1004726 A2 EP 1004726A2
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EP
European Patent Office
Prior art keywords
time
request signal
unlocking
key
signal
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Withdrawn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
EP99122806A
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German (de)
French (fr)
Inventor
Rene Brüssow
Lutz-Peter Breyer
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.)
Siemens AG
Original Assignee
Mannesmann VDO AG
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Filing date
Publication date
Application filed by Mannesmann VDO AG filed Critical Mannesmann VDO AG
Publication of EP1004726A2 publication Critical patent/EP1004726A2/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B81/00—Power-actuated vehicle locks
    • E05B81/54—Electrical circuits
    • E05B81/56—Control of actuators
    • E05B81/58—Control of actuators including time control, e.g. for controlling run-time of electric motors
    • 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
    • G07C2009/00388—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 code verification carried out according to the challenge/response method
    • G07C2009/00404—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 code verification carried out according to the challenge/response method starting with prompting the lock
    • 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
    • G07C2009/00555—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 comprising means to detect or avoid relay attacks
    • 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
    • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
    • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
    • G07C2009/00793—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means by Hertzian waves
    • 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
    • G07C2209/00—Indexing scheme relating to groups G07C9/00 - G07C9/38
    • G07C2209/60—Indexing scheme relating to groups G07C9/00174 - G07C9/00944
    • G07C2209/63—Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle

Definitions

  • the invention relates to a method for unlocking a Object, in particular a motor vehicle, by means of a electronic key, being from a transmitter Request signal is sent and after receiving this Signal through the key of this a response signal is sent out.
  • Such keys respond to a request signal which is emitted by the motor vehicle if for example, a door handle is operated, or if a person approaches the vehicle. These changes will be via sensors to a control device in the vehicle forwarded, which the sending of the Prompted signal.
  • the key sends in Receiving this signal in turn an identification signal which is received and verified by the motor vehicle becomes. After the key could be identified, for example, the central locking system is operated and that Vehicle released to the owner of the key.
  • the Key is designed to be low Has range, so that after removing the key from the Unlocking motor vehicle is prevented.
  • the object of the present invention is a method to indicate which one way to solve the offers the aforementioned problem.
  • Time counter is started and that after reaching the predefinable period of time the vehicle remains locked.
  • a time counter is started that after Receiving the response signal of the time counter is stopped the time duration measured by the time counter with the specified one Time period is compared and that the vehicle is locked is held if the measured time is greater than that predetermined time period.
  • the access locked on the vehicle as soon as the specified period of time is reached without the response signal of the key has arrived.
  • the vehicle is waiting the response signal and only then checks whether the predetermined time was exceeded.
  • Correction time period deducted from the measured time period becomes. Because the time which is the key to editing the Signals required, including the type and length of the signals depends on the next training course, that the correction period depending on the transmitted signals is selectable.
  • the correction period can, for example, be stored in a table in the vehicle his. The table contains the expected Key processing time for all provided Types of signals.
  • Unlocking are means of measuring the between the transmission of the request signal and the reception of the Response signal elapsed time means for comparison the elapsed time with a predetermined time and means for preventing unlocking when the elapsed time longer than the predetermined time is provided. If the response signal is within the arrives at the vehicle for a predetermined period of time Vehicle opened via a controllable central locking system.
  • other elements of the Vehicle such as the engine ignition, on the release manner according to the invention.
  • a microcontroller provided with a counting device in the control device. It is advantageous if the measured time period by the Meter reading of a binary working, with a constant Frequency clocked counting device is represented.
  • the temporal resolution of the time counter used is the given the smallest possible distance with this Method can be recorded.
  • the temporal resolution for example 50 ns. Obtained with the speed of light distance steps of about 15 m. By Using more accurate counters can also improve spatial Resolution can be increased accordingly.
  • Fig. 1 shows the block diagram of an inventive Facility.
  • a door handle When actuated by a sensor 1 attached there sends a signal to the Control device 2 transmitted.
  • the control device 2 sends a signal 3a via a transmitter 3.
  • the Indian Nearby key 4 answers with the answer signal 4a. After identification of the response signal and verification the removal according to the inventive method Central locking actuated.
  • Fig. 2 shows the temporal sequence of one with one performed device according to the invention Unlocking signals occurring.
  • the elapsed Time is increasing to the right in the horizontal direction applied.
  • the diagram is from top to bottom in the Read order of reference numerals.
  • the rectangular gradients in the diagram indicate the length of time that the Transmission of a signal including its duration between Sender and receiver pass.
  • At 21 registered one attached to the vehicle Sensor arrangement that one of the door handles of the vehicle is operated. Thereupon sends a built-in Control unit at 22 a signal that is close electronic key to send a Asks for an answer.
  • the curve 25 denotes the predetermined period of time during which the Control unit waits for a key response before unlocking of the vehicle is refused.
  • the Left-right arrows indicate the true term of the Signals between the key and the vehicle.
  • the Processing time marked. This is the one constant amount of time that the electronic components of the Key for processing the request signal up to Need time of sending the response signal.

Abstract

A procedure for unlocking an object, especially a car, by an electronic lock involves a demand signal sent out by a transmitter (3) and after reception of this signal by the key (4), a response signal is sent out by the key. No unlocking takes place if the response signal is received not inside a specified time period, counted from the transmission of the demand signal.

Description

Die Erfindung betrifft ein Verfahren zum Entriegeln eines Objekts, insbesondere eines Kraftfahrzeugs, mittels eines elektronischen Schlüssels, wobei von einem Sender ein Aufforderungssignal ausgesendet wird und nach Empfang dieses Signals durch den Schlüssel von diesem ein Antwortsignal ausgesendet wird.The invention relates to a method for unlocking a Object, in particular a motor vehicle, by means of a electronic key, being from a transmitter Request signal is sent and after receiving this Signal through the key of this a response signal is sent out.

Zur bequemen Entriegelung eines Kraftfahrzeugs werden in zunehmendem Maße elektronische Schlüssel eingesetzt. Derartige Schlüssel reagieren auf ein Aufforderungssignal, welches von dem Kraftfahrzeug ausgesendet wird, falls beispielsweise ein Türgriff betätigt wird, oder falls sich eine Person dem Fahrzeug nähert. Diese Veränderungen werden über eine Sensorik an eine Steuereinrichtung im Fahrzeug weitergeleitet, welche das Aussenden des Aufforderungssignals veranlaßt. Der Schlüssel sendet bei Empfang dieses Signals seinerseits ein Identifikationssignal aus, welches vom Kraftfahrzeug empfangen und verifiziert wird. Nachdem der Schlüssel identifiziert werden konnte, wird beispielsweise die Zentralverriegelung betätigt und das Fahrzeug für den Besitzer des Schlüssels freigegeben. Der Schlüssel ist derart ausgelegt, daß er eine geringe Reichweite hat, so daß nach Entfernen des Schlüssels vom Kraftfahrzeug ein Entriegeln verhindert wird.For convenient unlocking of a motor vehicle electronic keys are increasingly used. Such keys respond to a request signal which is emitted by the motor vehicle if for example, a door handle is operated, or if a person approaches the vehicle. These changes will be via sensors to a control device in the vehicle forwarded, which the sending of the Prompted signal. The key sends in Receiving this signal in turn an identification signal which is received and verified by the motor vehicle becomes. After the key could be identified, for example, the central locking system is operated and that Vehicle released to the owner of the key. The Key is designed to be low Has range, so that after removing the key from the Unlocking motor vehicle is prevented.

Bisherige Erfahrungen haben jedoch gezeigt, daß es durchaus Methoden gibt, einen derartigen Schlüssel unauffällig zum Aussenden des Identifikationssignals zu veranlassen und das Identifikationssignal zum Entriegeln des Fahrzeuges auch über weite Entfernungen hinweg drahtlos weiterzuleiten. Auf diese Weise kann das Fahrzeug durch Unbefugte geöffnet und gestartet werden.Previous experience has shown that it is There are methods to discard such a key To send out the identification signal and that Identification signal for unlocking the vehicle too to transmit wirelessly over long distances. On this way the vehicle can be opened by unauthorized persons be started.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren anzugeben, welches eine Möglichkeit zur Lösung des vorgenannten Problems bietet.The object of the present invention is a method to indicate which one way to solve the offers the aforementioned problem.

Diese Aufgabe wird dadurch gelöst, daß keine Entriegelung stattfindet, falls nicht innerhalb einer vorgebbaren Zeitdauer, vom Aussenden des Aufforderungssignals an gezählt, das Antwortsignal empfangen wird. Mit Hilfe der Ausbreitungsgeschwindigkeit c elektromagnetischer Wellen läßt sich anhand der vom Aussenden des Aufforderungssignals bis zum Empfang des Antwortsignals verstrichenen Zeitdauer die Lauflänge der Signale und damit die tatsächliche Entfernung des Schlüssels vom Fahrzeug ermitteln. Befindet sich der Schlüssel innerhalb eines zulässigen Bereichs in der Nähe des Fahrzeugs, so ist die Laufzeit der Signale zwischen Fahrzeug und Schlüssel gering. Bei Entfernung des Schlüssels vom Fahrzeug wird auch die Laufzeit größer. Bei Überschreiten einer gewissen Laufzeit, welche eine bestimmte höchstzulässige Entfernung des Schlüssels vom Fahrzeug repräsentiert, wird der Zugriff auf das Fahrzeug von der Steuereinrichtung verweigert. Die Verarbeitungszeiten, die die elektronischen Elemente des Schlüssels für die Bearbeitung der Signale verbrauchen, wird bei der Auswertung der Laufzeit berücksichtigt und der insgesamt verstrichenen Zeitdauer abgerechnet.This object is achieved in that no unlocking takes place, if not within a predetermined Time from the sending of the request signal counted, the response signal is received. With the help of Propagation speed c of electromagnetic waves can be based on the transmission of the request signal elapsed time until the response signal is received the run length of the signals and thus the actual Determine the distance of the key from the vehicle. Located the key within a permissible range close to the vehicle, so is the running time of the signals low between vehicle and key. When removing the The key from the vehicle also increases the runtime. At Exceeding a certain term, which a certain one maximum permitted removal of the key from the vehicle represents access to the vehicle by the Control device denied. The processing times that the electronic elements of the key for the Processing of the signals will be used in the evaluation the duration taken into account and the total elapsed Period billed.

Bei einem ersten Ausführungsbeispiel der Erfindung ist vorgesehen, daß mit Aussendung des Aufforderungssignals ein Zeitzähler gestartet wird und daß nach Erreichen der vorgebbaren Zeitdauer das Fahrzeug gesperrt bleibt. Alternativ dazu kann vorgesehen sein, daß mit Aussendung des Aufforderungssignals ein Zeitzähler gestartet wird, daß nach Empfang des Antwortsignals der Zeitzähler gestoppt wird, daß die vom Zeitzähler gemessene Zeitdauer mit der vorgegebenen Zeitdauer verglichen wird und daß das Fahrzeug gesperrt gehalten wird, falls die gemessene Zeitdauer größer als die vorgegebene Zeitdauer ist. Im ersten Fall wird der Zugriff auf das Fahrzeug gesperrt, sobald die vorgegebene Zeitdauer erreicht ist, ohne daß das Antwortsignal des Schlüssels eingetroffen ist. Im zweiten Fall wartet das Fahrzeug auf das Antwortsignal und prüft erst anschließend, ob die vorgegebene Zeitdauer überschritten wurde.In a first embodiment of the invention provided that with the transmission of the request signal Time counter is started and that after reaching the predefinable period of time the vehicle remains locked. Alternatively, it can be provided that when the Prompt signal a time counter is started that after Receiving the response signal of the time counter is stopped the time duration measured by the time counter with the specified one Time period is compared and that the vehicle is locked is held if the measured time is greater than that predetermined time period. In the first case, the access locked on the vehicle as soon as the specified period of time is reached without the response signal of the key has arrived. In the second case, the vehicle is waiting the response signal and only then checks whether the predetermined time was exceeded.

Da die im Schlüssel eingebauten elektronischen Elemente eine nicht vernachlässigbare Zeit zur Bearbeitung der Signale benötigen, ist bei einer Weiterbildung der Erfindung vorgesehen, daß zur Berücksichtigung der vom Schlüssel zur Verarbeitung des empfangenen Aufforderungssignals bis zum Senden der Antwort verbrauchten Verarbeitungszeit eine Korrekturzeitdauer von der gemessenen Zeitdauer abgezogen wird. Da die Zeit, welche der Schlüssel zur Bearbeitung der Signale benötigt, auch von der Art und der Länge der Signale abhängt, ist bei einer nächsten Weiterbildung vorgesehen, daß die Korrekturzeitdauer in Abhängigkeit von den übertragenen Signalen wählbar ist. Die Korrekturzeitdauer kann beispielsweise in einer Tabelle im Fahrzeug abgelegt sein. Die Tabelle enthält die voraussichtliche Verarbeitungsdauer des Schlüssels für alle vorgesehenen Arten von Signalen.Since the electronic elements built into the key are one non-negligible time to process the signals need is in a development of the invention provided that to take account of the key to Processing of the received request signal by Sending the response processing time used Correction time period deducted from the measured time period becomes. Because the time which is the key to editing the Signals required, including the type and length of the signals depends on the next training course, that the correction period depending on the transmitted signals is selectable. The correction period can, for example, be stored in a table in the vehicle his. The table contains the expected Key processing time for all provided Types of signals.

Indem die Verarbeitungszeit von der gemessenen Zeit abgezogen wird, erhält man die reine Laufzeit der Signale und kann daraus durch Halbieren und Multiplizieren mit der Ausbreitungsgeschwindigkeit c elektromagnetischer Wellen die Entfernung des Schlüssels zum Fahrzeug abschätzen. Ein Entriegeln des Fahrzeuges wird verhindert, sobald der Schlüssel weiter als Sichtweite vom Fahrzeug entfernt ist.By making the processing time from the measured time subtracted, you get the pure runtime of the signals and can be derived from it by halving and multiplying by Propagation velocity c of electromagnetic waves Estimate the distance of the key to the vehicle. On Unlocking the vehicle is prevented as soon as the Key is further than the line of sight from the vehicle.

Nachdem durch eine am Fahrzeug befindliche Sensoreinrichtung festgestellt wurde, daß sich eine Person dem Fahrzeug nähert oder daß einer der Türgriffe des Fahrzeugs betätigt wird, sendet die Steuereinrichtung das Aufforderungssignal aus. Um das Kraftfahrzeug mittels des erfindungsgemäßen Verfahrens entriegeln zu können, sind Mittel zur Messung der zwischen dem Aussenden des Aufforderungssignals und dem Empfang des Antwortsignals verstrichenen Zeitdauer Mittel zum Vergleich der verstrichenen Zeitdauer mit einer vorgegebenen Zeitdauer und Mittel zum Verhindern der Entriegelung, wenn die verstrichene Zeitdauer größer als die vorgegebene Zeitdauer ist, vorgesehen. Wenn das Antwortsignal innerhalb der vorgegebenen Zeitdauer am Fahrzeug eintrifft, wird das Fahrzeug über eine steuerbare Zentralverriegelung geöffnet. Neben den Türschlössern lassen sich auch andere Elemente des Fahrzeugs, beispielsweise die Motorzündung, auf die erfindungsgemäße Weise freigeben.After by a sensor device located on the vehicle it was found that a person is approaching the vehicle or that one of the door handles of the vehicle is operated, the control device sends out the request signal. Around the motor vehicle by means of the method according to the invention Unlocking are means of measuring the between the transmission of the request signal and the reception of the Response signal elapsed time means for comparison the elapsed time with a predetermined time and means for preventing unlocking when the elapsed time longer than the predetermined time is provided. If the response signal is within the arrives at the vehicle for a predetermined period of time Vehicle opened via a controllable central locking system. In addition to the door locks, other elements of the Vehicle, such as the engine ignition, on the release manner according to the invention.

Zur Messung der verstrichenen Zeitdauer kann beispielsweise ein mit einer Zählvorrichtung versehener Mikrocontroller in der Steuereinrichtung vorgesehen sein. Dabei ist es vorteilhaft, wenn die gemessene Zeitdauer durch den Zählerstand einer binär arbeitenden, mit einer konstanten Frequenz getakteten Zählvorrichtung repräsentiert ist. Durch die zeitliche Auflösung des verwendeten Zeitzählers ist die kleinstmögliche Entfernung vorgegeben, die mit dieser Methode erfaßt werden kann. Bei einem handelsüblichen Mikrocontroller beträgt die zeitliche Auflösung beispielsweise 50 ns. Mit der Lichtgeschwindigkeit ergeben sich daraus Entfernungsschritte von etwa 15 m. Durch Verwendung genauerer Zähler kann auch die räumliche Auflösung entsprechend erhöht werden.For example, to measure the elapsed time a microcontroller provided with a counting device in the control device. It is advantageous if the measured time period by the Meter reading of a binary working, with a constant Frequency clocked counting device is represented. By the temporal resolution of the time counter used is the given the smallest possible distance with this Method can be recorded. With a commercially available Microcontroller is the temporal resolution for example 50 ns. Obtained with the speed of light distance steps of about 15 m. By Using more accurate counters can also improve spatial Resolution can be increased accordingly.

Die Erfindung läßt zahlreiche Ausführungsformen zu. Eine davon ist in der Zeichnung anhand mehrerer Figuren dargestellt und nachfolgend beschrieben. Es zeigt:

Fig. 1
das Blockschaltbild einer erfindungsgemäßen Einrichtung und
Fig. 2
ein Ablaufdiagramm der bei einer erfindungsgemäßen Einrichtung auftretenden Signale.
The invention permits numerous embodiments. One of them is shown in the drawing using several figures and described below. It shows:
Fig. 1
the block diagram of a device according to the invention and
Fig. 2
a flowchart of the signals occurring in a device according to the invention.

Gleiche Teile sind in den Figuren mit gleichen Bezugszeichen versehen.Identical parts are given the same reference symbols in the figures Mistake.

Fig. 1 zeigt das Blockschaltbild einer erfindungsgemäßen Einrichtung. Bei Betätigen eines Türgriffs wird von einem dort angebrachten Sensor 1 ein Signal an die Steuereinrichtung 2 übermittelt. Die Steuereinrichtung 2 sendet über einen Sender 3 ein Signal 3a aus. Der in der Nähe befindliche Schlüssel 4 antwortet mit dem Antwortsignal 4a. Nach Identifikation des Antwortsignals und Überprüfung der Entfernung nach dem erfindungsgemäßen Verfahren wird die Zentralverriegelung betätigt.Fig. 1 shows the block diagram of an inventive Facility. When a door handle is actuated by a sensor 1 attached there sends a signal to the Control device 2 transmitted. The control device 2 sends a signal 3a via a transmitter 3. The Indian Nearby key 4 answers with the answer signal 4a. After identification of the response signal and verification the removal according to the inventive method Central locking actuated.

Fig. 2 zeigt die zeitliche Folge der bei einem mit einer erfindungsgemäßen Einrichtung durchgeführten Entriegelungsvorgang auftretenden Signale. Die verstrichene Zeit ist in horizontaler Richtung nach rechts steigend aufgetragen. Das Diagramm ist von oben nach unten in der Reihenfolge der Bezugszeichen zu lesen. Die Rechteckverläufe im Diagramm kennzeichnen die Zeitdauer, welche bei der Aussendung eines Signales samt seiner Laufzeit zwischen Sender und Empfänger verstreicht.Fig. 2 shows the temporal sequence of one with one performed device according to the invention Unlocking signals occurring. The elapsed Time is increasing to the right in the horizontal direction applied. The diagram is from top to bottom in the Read order of reference numerals. The rectangular gradients in the diagram indicate the length of time that the Transmission of a signal including its duration between Sender and receiver pass.

Bei 21 registriert eine am Fahrzeug angebrachte Sensoranordnung, daß einer der Türgriffe des Fahrzeuges betätigt wird. Daraufhin sendet ein im Fahrzeug eingebautes Steuergerät bei 22 ein Signal aus, welches einen in der Nähe befindlichen elektronischen Schlüssel zum Aussenden einer Antwort auffordert. Der Schlüssel antwortet bei 23 nach Empfang der Aufforderung mit einem Antwortsignal. Nach der Identifikation des Schlüssels wird vom Steuergerät zur Messung der wahren räumlichen Entfernung zwischen Schlüssel und Fahrzeug bei 24 erneut ein Aufforderungssignal ausgesendet.At 21 registered one attached to the vehicle Sensor arrangement that one of the door handles of the vehicle is operated. Thereupon sends a built-in Control unit at 22 a signal that is close electronic key to send a Asks for an answer. The key answers at 23 after Receive the request with a response signal. After The key is used to identify the key Measure the true spatial distance between keys and vehicle at 24 again a prompt signal sent out.

Unmittelbar danach wird ein Zeitzähler gestartet. Die Kurve 25 kennzeichnet die vorgegebene Zeitdauer, während der das Steuergerät auf eine Antwort des Schlüssels wartet, bevor ein Entriegeln des Fahrzeuges verweigert wird. Die Links-Rechts-Pfeile kennzeichnen die wahre Laufzeit der Signale zwischen Schlüssel und Fahrzeug. Mit 26 wird die Verarbeitungszeit gekennzeichnet. Dies ist diejenige konstante Zeitdauer, die die elektronischen Komponenten des Schlüssels zur Verarbeitung des Aufforderungssignals bis zum Zeitpunkt des Aussendens des Antwortsignals benötigen.A timer is started immediately afterwards. The curve 25 denotes the predetermined period of time during which the Control unit waits for a key response before unlocking of the vehicle is refused. The Left-right arrows indicate the true term of the Signals between the key and the vehicle. At 26, the Processing time marked. This is the one constant amount of time that the electronic components of the Key for processing the request signal up to Need time of sending the response signal.

Im Fall A wird das bei 24 ausgesendete Aufforderungssignal an den Schlüssel übertragen (26a), anschließend verarbeitet (26) und schließlich ein Antwortsignal vom Schlüssel ausgesendet und zum Fahrzeug übertragen (26b). Solange diese Abläufe, wie in Fall A gezeigt, weniger Zeit beanspruchen, als mit 25 vorgegeben ist, befindet sich der Schlüssel innerhalb des vorgegebenen Radius um das Fahrzeug und das Fahrzeug wird entriegelt. Bei Fall B ist der Schlüssel zu weit vom Fahrzeug entfernt. Durch die damit deutlich längere Übertragungsdauer (26a') des Aufforderungssignals zum Schlüssel verschieben sich alle folgenden Abläufe und das Antwortsignal kann nicht innerhalb des durch 25 vorgegebenen Zeitraums empfangen werden. Das Steuergerät verweigert in diesem Fall den Zugriff auf das Fahrzeug, weil der Schlüssel unzulässig weit vom Fahrzeug entfernt ist.In case A, the prompt signal sent out at 24 transferred to the key (26a), then processed (26) and finally a response signal from the key transmitted and transmitted to the vehicle (26b). As long as this Processes, as shown in case A, take less time, the key is located at 25 within the given radius around the vehicle and the The vehicle is unlocked. In case B the key is closed far from the vehicle. Because of the much longer Transmission duration (26a ') of the request signal to Keys shift all subsequent processes and that Response signal cannot be within the range given by 25 Period. The control unit denied in this case access to the vehicle because of the key is impermissibly far from the vehicle.

Claims (8)

Verfahren zum Entriegeln eines Objekts, insbesondere eines Kraftfahrzeugs, mittels eines elektronischen Schlüssels, wobei von einem Sender (3) ein Aufforderungssignal (3a) ausgesendet wird und nach Empfang dieses Signals durch den Schlüssel (4) von diesem ein Antwortsignal (4a) ausgesendet wird, dadurch gekennzeichnet, daß keine Entriegelung stattfindet, falls nicht innerhalb einer vorgebbaren Zeitdauer (25), vom Aussenden des Aufforderungssignals (3a) an gezählt, das Antwortsignal (4a) empfangen wird.Method for unlocking an object, in particular of a motor vehicle, by means of an electronic Key, being from a transmitter (3) Request signal (3a) is sent and after receipt this signal by the key (4) of this one Response signal (4a) is sent, characterized in that that no unlocking takes place, if not inside a predeterminable time period (25), from sending the Request signal (3a) counted on, the response signal (4a) Will be received. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß mit Aussendung des Aufforderungssignals (3a) ein Zeitzähler gestartet wird und daß nach Erreichen der vorgebbaren Zeitdauer (25) das Objekt gesperrt bleibt.A method according to claim 1, characterized in that a time counter when the request signal (3a) is sent is started and that after reaching the predetermined Time period (25) the object remains locked. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß mit Aussendung des Aufforderungssignals (3a) ein Zeitzähler gestartet wird, daß nach Empfang des Antwortsignals (4a) der Zeitzähler gestoppt wird, daß die vom Zeitzähler gemessene Zeitdauer mit der vorgegebenen Zeitdauer (25) verglichen wird und daß das Objekt gesperrt gehalten wird, falls die gemessene Zeitdauer größer als die vorgegebene Zeitdauer (25) ist.A method according to claim 1, characterized in that a time counter when the request signal (3a) is sent is started that after receiving the response signal (4a) Time counter is stopped, that the measured by the time counter Duration compared with the predetermined period (25) and that the object is kept locked if the The measured time is greater than the specified time (25) is. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß zur Berücksichtigung der vom Schlüssel (4) zur Verarbeitung des empfangenen Aufforderungssignals (3a) bis zum Senden der Antwort (4a) verbrauchten Verarbeitungszeit eine Korrekturzeitdauer (26) von der gemessenen Zeitdauer abgezogen wird.A method according to claim 3, characterized in that to take into account the processing of the key (4) of the received request signal (3a) until the Answer (4a) processing time consumed Correction time period (26) from the measured time period is subtracted. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß die Korrekturzeitdauer (26) in Abhängigkeit von den übertragenen Signalen (3a) wählbar ist.A method according to claim 3, characterized in that the correction period (26) depending on the transmitted signals (3a) can be selected. Einrichtung zum Entriegeln eines Objekts mittels eines mit einem Sender und einem Empfänger versehenen elektronischen Schlüssels (4), der nach Empfang eines Aufforderungssignals (3a) ein Antwortsignal (4a) aussendet, bestehend aus einer Steuereinrichtung (2), welche mit einer Sensoranordnung (1) zur Überwachung der Umgebung und/oder der Türgriffe des Objekts in Verbindung steht, einem Sender (3) zur Aussendung eines Aufforderungssignals (3a) bei Ansprechen der Sensoranordnung (1) über Antennen, sowie aus steuerbaren Schließeinrichtungen (5) zum automatischen Ver- und Entriegeln des Objekts,
dadurch gekennzeichnet,
daß Mittel zur Messung der zwischen dem Aussenden des Aufforderungssignals (3a) und dem Empfang des Antwortsignals (4a) verstrichenen Zeitdauer, Mittel zum Vergleich der verstrichenen Zeitdauer mit einer vorgegebenen Zeitdauer und Mittel zum Verhindern der Entriegelung, wenn die verstrichene Zeitdauer größer als die vorgegebene Zeitdauer ist, vorgesehen sind. Device for unlocking an object by means of an electronic key (4) provided with a transmitter and a receiver, which, after receiving a request signal (3a), sends out a response signal (4a), consisting of a control device (2) which is connected to a sensor arrangement (1) for monitoring the surroundings and / or the door handles of the object, a transmitter (3) for transmitting a request signal (3a) when the sensor arrangement (1) responds via antennas, as well as from controllable locking devices (5) for automatically locking and unlocking the object,
characterized,
that means for measuring the time elapsed between the transmission of the request signal (3a) and the reception of the response signal (4a), means for comparing the elapsed time with a predetermined time and means for preventing the unlocking if the elapsed time is greater than the predetermined time is provided. Einrichtung nach Anspruch 6, dadurch gekennzeichnet, daß ein in der Steuereinrichtung (2) angeordneter Mikrocontroller zur Messung der verstrichenen Zeitdauer mit einer Zählvorrichtung versehen ist.Device according to claim 6, characterized in that one arranged in the control device (2) Microcontroller to measure the elapsed time with a counting device is provided. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die gemessene Zeitdauer durch den Zählerstand einer binär arbeitenden, mit einer konstanten Frequenz getakteten Zählvorrichtung repräsentiert ist.Device according to one of the preceding claims, characterized in that the measured period of time by the counter reading of a binary working, with a represented constant frequency clocked counting device is.
EP99122806A 1998-11-24 1999-11-17 Method for unlocking an object, especially a motor vehicle Withdrawn EP1004726A2 (en)

Applications Claiming Priority (2)

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DE19854128 1998-11-24
DE19854128A DE19854128A1 (en) 1998-11-24 1998-11-24 Method for unlocking an object, in particular a motor vehicle

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EP1004726A2 true EP1004726A2 (en) 2000-05-31

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1271420A2 (en) * 2001-06-29 2003-01-02 Alps Electric Co., Ltd. Passive entry with anti-theft function
DE10143017A1 (en) * 2001-09-01 2003-03-20 Juergen Flath Method for protecting motor vehicles from theft has transmitters and receivers in vehicle and personal unit which resounds in fixed time and distance
WO2004051581A1 (en) * 2002-11-29 2004-06-17 Philips Intellectual Property & Standards Gmbh Electronic communication system and method of detecting a relay attack thereon
WO2006134773A1 (en) * 2005-06-15 2006-12-21 Toyota Jidosha Kabushiki Kaisha Remote operation apparatus and service center
EP3478542A4 (en) * 2016-07-01 2019-06-26 Texas Instruments Incorporated Relay-attack resistant communications

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE519748C2 (en) 2000-10-23 2003-04-08 Volvo Technology Corp Procedure for checking access rights to an object and the computer program product for performing procedures
KR100458967B1 (en) * 2002-04-16 2004-12-03 이중재 Digital radio locking device capable of saving power used in the same and setting up time, and method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4003280C5 (en) * 1990-02-03 2007-06-28 Bayerische Motoren Werke Ag Safety device for motor vehicles
DE4409167C1 (en) * 1994-03-17 1995-06-29 Siemens Ag Remote-controlled centralised locking system for automobile
DE4440855C2 (en) * 1994-11-15 2000-04-06 Simons & Vos Identifikationssy Control system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1271420A2 (en) * 2001-06-29 2003-01-02 Alps Electric Co., Ltd. Passive entry with anti-theft function
EP1271420A3 (en) * 2001-06-29 2004-04-07 Alps Electric Co., Ltd. Passive entry with anti-theft function
US6850148B2 (en) 2001-06-29 2005-02-01 Alps Electric Co., Ltd. Passive entry with anti-theft function
DE10143017A1 (en) * 2001-09-01 2003-03-20 Juergen Flath Method for protecting motor vehicles from theft has transmitters and receivers in vehicle and personal unit which resounds in fixed time and distance
WO2004051581A1 (en) * 2002-11-29 2004-06-17 Philips Intellectual Property & Standards Gmbh Electronic communication system and method of detecting a relay attack thereon
WO2006134773A1 (en) * 2005-06-15 2006-12-21 Toyota Jidosha Kabushiki Kaisha Remote operation apparatus and service center
EP3478542A4 (en) * 2016-07-01 2019-06-26 Texas Instruments Incorporated Relay-attack resistant communications
US10897477B2 (en) 2016-07-01 2021-01-19 Texas Instruments Incorporated Relay-attack resistant communications
US11743283B2 (en) 2016-07-01 2023-08-29 Texas Instruments Incorporated Relay-attack resistant communications

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DE19854128A1 (en) 2000-05-31

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