EP0128457A2 - Coding method for an electronic key - Google Patents

Coding method for an electronic key Download PDF

Info

Publication number
EP0128457A2
EP0128457A2 EP84106142A EP84106142A EP0128457A2 EP 0128457 A2 EP0128457 A2 EP 0128457A2 EP 84106142 A EP84106142 A EP 84106142A EP 84106142 A EP84106142 A EP 84106142A EP 0128457 A2 EP0128457 A2 EP 0128457A2
Authority
EP
European Patent Office
Prior art keywords
receiver
code
transmitter
electronic key
numbers
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Withdrawn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
EP84106142A
Other languages
German (de)
French (fr)
Other versions
EP0128457A3 (en
Inventor
Friedrich Dr. Dannhäuser
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
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0128457A2 publication Critical patent/EP0128457A2/en
Publication of EP0128457A3 publication Critical patent/EP0128457A3/en
Withdrawn legal-status Critical Current

Links

Images

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
    • G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
    • 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
    • G07C9/20—Individual registration on entry or exit involving the use of a pass
    • G07C9/21—Individual registration on entry or exit involving the use of a pass having a variable access code
    • 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
    • G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
    • G07C2009/00238—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks the transmittted data signal containing a code which is changed
    • G07C2009/00253—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks the transmittted data signal containing a code which is changed dynamically, e.g. variable code - rolling code
    • 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
    • G07C2009/00785—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 light

Definitions

  • the invention relates to a method for code security in an electronic key, in particular for motor vehicles with a built-in central locking system, which consists of a transmitter which emits a coded infrared signal which is received by a receiver matched to the code, the code of Signals at the transmitter and receiver can be adjusted in that a number of code numbers 1 to n are stored in the transmitter and in the receiver and a new matching code number is automatically set in the transmitter and receiver after each transmission and reception process.
  • the transmitter and receiver are different Codes set because the code number in the transmitter is switched after each transmission, but the receiver, because it has not received a signal, has remained on the code number corresponding to the signal last received. So it happens that the motor vehicle can no longer be unlocked.
  • the code sent by the transmitter contains information for the receiver as to which code number is to be selected next from the stored stock.
  • An advantageous embodiment of the method according to the invention consists in the fact that the receiver accepts resynchronization only in the direction of higher code numbers. It is also advantageous if the receiver only accepts resynchronization in a narrow interval of code numbers.
  • the security risk is significantly restricted by the further development according to the invention, since the sequence formed from the two codes could lead to the lock being opened if unauthorized repetition occurs. Because the receiver only accepts resynchronization to higher numbers in its code list or only in a narrow interval of code numbers, a code sequence that has been listened to is immediately ineffective and can only be used after a long period of time unknown to the unauthorized user become effective.
  • a block diagram of an electronic key which consists of a transmitter 1 and a receiver 2.
  • the transmitter 1 controls, for example via the amplifier 3, a photodiode 4, which emits an infrared signal 5, which is picked up by a phototransistor 6.
  • the infrared signal 5 is coded and additionally contains information for the receiver 2 which code number is to be selected next from the stored stock.
  • the signal at the phototransistor 6 is fed via the amplifier 7 to the receiver 2, at the output 8 of which a signal 9 appears by which the central locking of the motor vehicle is controlled.
  • transmitter 1 and receiver 2 each consist of a CMOS microprocessor with subsequent amplifiers 3 and 7 and infrared transmitter diode 4 and infrared photo transistor 6.
  • a receiving diode can also be connected.
  • n 11 there are approx. 40 million possible combinations. These possible combinations are selected in a suitable manner and stored in the transmitter 1 and receiver 2, so that it is ensured during manufacture that a vehicle works with only one code set, that is to say that there is only one key for one vehicle.
  • the method according to the invention makes it possible in a simple manner to design an electronic key for motor vehicles that is secure against theft, a synchronization between the transmitter and receiver being set if asynchronousness between transmitter and receiver initially exists due to accidentally triggered transmission signals.
  • the transmitter can for example be of the order of a matchbox so that it can be carried easily.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Lock And Its Accessories (AREA)
  • Selective Calling Equipment (AREA)

Abstract

In a coding method for an electronic key, a number of code numbers 1 to n are stored in the transmitter (1) and in the receiver (2) and a new corresponding code number is set automatically in the transmitter (1) and receiver (2) after every transmission and reception operation. The code emitted by the transmitter (1) contains information for the receiver (2) as to which code number is to be selected next from the stock. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur Code-Sicherung bei einem elektronischen Schlüssel, insbesondere für Kraftfahrzeuge mit eingebauter Zentralverriegelung, der aus einem Sender besteht, welcher ein codiertes Infrarot-Signal aussendet, das von einem auf den Code abgestimmten Empfänger aufgenommen wird, wobei der Code des Signals bei Sender und Empfänger verstellbar sind, indem im Sender und im Empfänger eine Anzahl von Code-Nummern 1 bis n gespeichert sind und nach jedem Sende-und Empfangsvorgang im Sender und Empfänger eine neue übereinstimmende Code-Nummer selbsttätig eingestellt wird.The invention relates to a method for code security in an electronic key, in particular for motor vehicles with a built-in central locking system, which consists of a transmitter which emits a coded infrared signal which is received by a receiver matched to the code, the code of Signals at the transmitter and receiver can be adjusted in that a number of code numbers 1 to n are stored in the transmitter and in the receiver and a new matching code number is automatically set in the transmitter and receiver after each transmission and reception process.

Ein derartiges Verfahren ist aus der europäischen Patentanmeldung 83 108 588.1 bekannt. Das bekannte Verfahren soll die Möglichkeit eines Diebstahles durch Kopieren des Codes bei der Benutzung elektronischer Schlüssel mit drahtloser Übertragung eines Codes (z.B. mit moduliertem Infrarotlicht) verhindern. Diese Gefahr wird weitgehend reduziert durch Verwendung einer Anzahl verschiedener Codes, die von Mal zu Mal geändert werden. Für eine einwandfreie Benutzung ist eine synchrond Auswahl erforderlich, d.h. Sender und Empfänger müssen jeweils auf den gleichen Code eingestellt sein.Such a method is known from European patent application 83 108 588.1. The known method is intended to prevent the possibility of theft by copying the code when using electronic keys with wireless transmission of a code (e.g. with modulated infrared light). This risk is largely reduced by using a number of different codes that are changed from time to time. A synchronous selection is required for correct use, i.e. The sender and receiver must each be set to the same code.

Wenn nun versehentlich ein oder mehrere Sendevorgänge außerhalb des Empfangsbereiches des Empfängers erfolgen, sind Sender und Empfänger auf verschiedene Codes eingestellt, da die Code-Nummer zwar im Sender nach jedem Sendevorgang weitergeschaltet wird, der Empfänger jedoch, weil er kein Signal empfangen hat, auf der dem zuletzt empfangenen Signal entsprechenden Code-Nummer stehengeblieben ist. Es tritt also der Fall ein, daß sich das Kraftfahrzeug nicht mehr aufschließen läßt.If one or more transmission processes take place accidentally outside the reception range of the receiver, the transmitter and receiver are different Codes set because the code number in the transmitter is switched after each transmission, but the receiver, because it has not received a signal, has remained on the code number corresponding to the signal last received. So it happens that the motor vehicle can no longer be unlocked.

In der älteren Patentanmeldung ist nun vorgeschlagen worden, die Synchronisation entweder durch ein Quittierungssignal vom Empfänger oder durch Datenaustausch über eine direkte elektrische Verbindung vorzunehmen. Die erste Lösung ist jedoch technisch aufwendig und die zweite nicht immer durchführbar oder erwünscht.In the older patent application it has now been proposed to carry out the synchronization either by an acknowledgment signal from the receiver or by data exchange via a direct electrical connection. However, the first solution is technically complex and the second is not always feasible or desirable.

Aufgabe der vorliegenden Erfindung ist es daher, das eingangs genannte Verfahren derart weiterzubilden, daß auch bei nichtvorhandener Synchronisation zwischen Sender und Empfänger wieder eine Synchronisation in einfacher Weise hergestellt werden kann.It is therefore an object of the present invention to further develop the method mentioned at the outset in such a way that synchronization can be established again in a simple manner even when there is no synchronization between transmitter and receiver.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der vom Sender ausgesandte Code eine Information für den Empfänger enthält, welche Code-Nummer als nächste aus dem gespeicherten Vorrat auszuwählen ist.This object is achieved according to the invention in that the code sent by the transmitter contains information for the receiver as to which code number is to be selected next from the stored stock.

Damit wird der Vorteil erzielt, daß auch in dem Fall, in dem Sender und Empfänger auf verschiedene Codes eingestellt sind und der erste Öffnungsversuch daher erfolglos bleiben wird, der Empfänger die Information zur Auswahl des folgenden Codes übernimmt, so daß beim folgenden Tastendruck des Senders das System synchron arbeitet und das Schloß geöffnet wird.This has the advantage that even in the case in which the transmitter and receiver are set to different codes and the first attempt to open it will therefore be unsuccessful, the receiver takes over the information for the selection of the following code, so that when the transmitter is pressed the next time System works synchronously and the lock is opened.

Eine vorteilhafte Ausgestaltung des erfindungsgemäßen Verfahrens besteht darin, daß der Empfänger eine Nachsynchronisierung nur in Richtung zu höheren Code-Nummern annimmt. Weiterhin ist es vorteilhaft, wenn der Empfänger eine Nachsynchronisierung nur in einem engen Intervall von Code-Nummern annimmt.An advantageous embodiment of the method according to the invention consists in the fact that the receiver accepts resynchronization only in the direction of higher code numbers. It is also advantageous if the receiver only accepts resynchronization in a narrow interval of code numbers.

Durch die erfindungsgemäße Weiterbildung wird das Sicherheitsrisiko wesentlich eingeschränkt, da die aus beiden Codes gebildete Folge bei unbefugter Wiederholung zum Öffnen des Schlosses führen könnte. Dadurch, daß der Empfänger eine Nachsynchronisierung nur zu höheren Nummern in seiner Code-Liste bzw. nur in einem engen Intervall von Code-Nummern akzeptiert, ist eine einmal abgehörte Code-Folge sofort wirkungslos und kann erst nach längerer, dem unbefugten Benutzer unbekannter Zeit einigemale wirkungsvoll werden.The security risk is significantly restricted by the further development according to the invention, since the sequence formed from the two codes could lead to the lock being opened if unauthorized repetition occurs. Because the receiver only accepts resynchronization to higher numbers in its code list or only in a narrow interval of code numbers, a code sequence that has been listened to is immediately ineffective and can only be used after a long period of time unknown to the unauthorized user become effective.

Weitere Vorteile des erfindungsgemäßen Verfahrens werden im Zusammenhang mit dem folgenden Ausführungsbeipiel erläutert. In der dazugehörenden Zeichnung ist ein Blockschaltbild eines elektronischen Schlüssels dargestellt, der aus einem Sender 1 und einem Empfänger 2 besteht. Der Sender 1 steuert beispielsweise über den Verstärker 3 eine Fotodiode 4 an, welche ein Infrarotsignal 5 aussendet, das von einem Fototransistor 6 aufgenommen wird. Das Infrarotsignal 5 ist codiert und enthält zusätzlich eine Information für den Empfänger 2, welche Code-Nummer als nächste aus dem gespeicherten Vorrat auszuwählen ist. Das Signal am Fototransistor 6 wird über den Verstärker 7 dem Empfänger 2 zugeleitet, an dessen Ausgang 8 ein Signal 9 erscheint, durch das die Zentralverriegelung des Kraftfahrzeuges gesteuert wird.Further advantages of the method according to the invention are explained in connection with the following exemplary embodiment. In the accompanying drawing, a block diagram of an electronic key is shown, which consists of a transmitter 1 and a receiver 2. The transmitter 1 controls, for example via the amplifier 3, a photodiode 4, which emits an infrared signal 5, which is picked up by a phototransistor 6. The infrared signal 5 is coded and additionally contains information for the receiver 2 which code number is to be selected next from the stored stock. The signal at the phototransistor 6 is fed via the amplifier 7 to the receiver 2, at the output 8 of which a signal 9 appears by which the central locking of the motor vehicle is controlled.

Beispielsweise bestehen Sender 1 und Empfänger 2 aus je einem CMOS-Mikroprozessor mit nachfolgenden Verstärkern 3 bzw. 7 und Infrarotsendediode 4 und Infrarotfototransistor 6. Anstelle des Fototransistors 6 kann auch eine Empfangsdiode geschaltet sein. Diese Anordnung bietet in einfacher Weise eine große Anzahl von Codiermöglichkeiten. Bei einem sogenannten "m-Bit-Telegramm" ergibt dies 2m- Kombination, mit m = 24 z.B. 16 Millionen. Nimmt man beispielsweise pro Fahrzeug n (z.B. 10 Codes), so vermindert sich die Zahl der Möglichkeiten zwar auf 1/n (1,6 Millionen), berücksichtigt man aber die Reihenfolge, so ergeben sich pro Fahrzeug wieder n ! Permutationen der Reihenfolge dieser n-Codes und somit 10 !, also 3,6 Millionen. Bei n = 11 ergeben sich ca. 40 Millionen Kombinationsmöglichkeiten. Diese Kombinationsmöglichkeiten werden in geeigneter Weise ausgewählt und im Sender 1 und Empfänger 2 gespeichert, so daß bei der Fabrikation sichergestellt ist, daß ein Fahrzeug mit nur einem Codesatz funktioniert, daß also nur ein Schlüssel für ein Fahrzeug existiert.For example, transmitter 1 and receiver 2 each consist of a CMOS microprocessor with subsequent amplifiers 3 and 7 and infrared transmitter diode 4 and infrared photo transistor 6. Instead of photo transistor 6, a receiving diode can also be connected. This arrangement offers a large number of coding possibilities in a simple manner. With a so-called "m-bit telegram", this results in a 2 m combination, with m = 24, for example 16 million. If, for example, you take n (for example 10 codes) per vehicle, the number of options decreases to 1 / n (1.6 million), but if you take the sequence into account, there are n again for each vehicle! Permutations of the order of these n-codes and thus 10 !, i.e. 3.6 million. With n = 11 there are approx. 40 million possible combinations. These possible combinations are selected in a suitable manner and stored in the transmitter 1 and receiver 2, so that it is ensured during manufacture that a vehicle works with only one code set, that is to say that there is only one key for one vehicle.

Das erfindungsgemäße Verfahren gestattet in einfacher Weise, einen elektronischen Schlüssel für Kraftfahrzeuge diebstahlsicher auszubilden, wobei eine Synchronisation zwischen Sender und Empfänger eingestellt wird, wenn durch versehentlich ausgelöste Sendesignale zunächst eine Asynchronität zwischen Sender und Empfänger vorhanden ist. Der Sender kann dabei beispielsweise in der Größenordnung einer Streichholzschachtel ausgebildet sein, so daß er bequem mitgeführt werden kann.The method according to the invention makes it possible in a simple manner to design an electronic key for motor vehicles that is secure against theft, a synchronization between the transmitter and receiver being set if asynchronousness between transmitter and receiver initially exists due to accidentally triggered transmission signals. The transmitter can for example be of the order of a matchbox so that it can be carried easily.

Claims (3)

1. Verfahren zur Code-Sicherung bei einem elektronischen Schlüssel, insbesondere für Kraftfahrzeuge, mit eingebauter Zentralverriegelung, der aus einem Sender besteht, welcher ein codiertes InfrarotSignal aussendet, das von einem auf den Code abgestimmten Empfänger aufgenommen wird, wobei der Code des Signals bei Sender und Empfänger verstellbar sind, in dem im Sender und im Empfänger eine Anzahl von Code-Nummern 1 bis n gespeichert sind und nach jedem Sende- und Empfangsvorgang im Sender und Empfänger eine neue übereinstimmende Code-Nummer selbsttätig eingestellt wird, dadurch gekennzeichnet, daß der vom Sender ausgesandte Code eine Information für den Empfänger enthält, welche Code-Nummer als nächste aus dem gespeicherten Vorrat auszuwählen ist.1. Method for securing a code for an electronic key, in particular for motor vehicles, with a built-in central locking system which consists of a transmitter which emits a coded infrared signal which is received by a receiver which is matched to the code, the code of the signal at the transmitter and receiver are adjustable, in which a number of code numbers 1 to n are stored in the transmitter and in the receiver and after each transmission and reception process in the transmitter and receiver a new matching code number is automatically set, characterized in that the Transmitter sent code contains information for the recipient, which code number is to be selected next from the stored stock. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Empfänger eine Nachsynchronisierung nur in Richtung zu höheren Code-Nummern annimmt.2. The method according to claim 1, characterized in that the receiver accepts a resynchronization only in the direction of higher code numbers. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Empfänger eine Nachsynchronisierung nur in einem engen Intervall von Code-Nummern annimmt.3. The method according to claim 1 or 2, characterized in that the receiver accepts a resynchronization only in a narrow interval of code numbers.
EP84106142A 1983-06-08 1984-05-29 Coding method for an electronic key Withdrawn EP0128457A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833320721 DE3320721A1 (en) 1983-06-08 1983-06-08 METHOD FOR SECURING THE CODE OF AN ELECTRONIC KEY
DE3320721 1983-06-08

Publications (2)

Publication Number Publication Date
EP0128457A2 true EP0128457A2 (en) 1984-12-19
EP0128457A3 EP0128457A3 (en) 1987-07-22

Family

ID=6200962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84106142A Withdrawn EP0128457A3 (en) 1983-06-08 1984-05-29 Coding method for an electronic key

Country Status (3)

Country Link
EP (1) EP0128457A3 (en)
JP (1) JPS6010081A (en)
DE (1) DE3320721A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219060A2 (en) * 1985-10-11 1987-04-22 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Security device for an automotive vehicle

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3520397A1 (en) * 1985-06-07 1986-12-11 Audi AG, 8070 Ingolstadt CODING METHOD
DE3624707A1 (en) * 1985-07-22 1987-01-22 Aisin Seiki LOCK CONTROL DEVICE FOR VEHICLES
DE3636822C2 (en) * 1986-10-29 1993-12-23 Ruf Kg Wilhelm Electronic remote control device, in particular for central locking systems of motor vehicles
FR2616252A1 (en) * 1987-06-04 1988-12-09 Lot Gerard Method and installation for monitoring movements in a protected area
US4854143A (en) * 1987-08-07 1989-08-08 Intelock Corporation Bolt assembly and method
DE3840857A1 (en) * 1988-12-03 1990-06-07 Hella Kg Hueck & Co Device for the remote control of security devices
US6166650A (en) * 1991-05-29 2000-12-26 Microchip Technology, Inc. Secure self learning system
DE4221142C2 (en) * 1992-06-27 1998-02-19 Kiekert Ag Central locking system for a motor vehicle
JP3319230B2 (en) * 1994-08-05 2002-08-26 株式会社デンソー Remote control device
EP0771498B1 (en) 1995-05-17 2007-05-09 The Chamberlain Group, Inc. Rolling code security system
US6690796B1 (en) 1995-05-17 2004-02-10 The Chamberlain Group, Inc. Rolling code security system
US6108326A (en) 1997-05-08 2000-08-22 Microchip Technology Incorporated Microchips and remote control devices comprising same
US8422667B2 (en) 2005-01-27 2013-04-16 The Chamberlain Group, Inc. Method and apparatus to facilitate transmission of an encrypted rolling code
US9148409B2 (en) 2005-06-30 2015-09-29 The Chamberlain Group, Inc. Method and apparatus to facilitate message transmission and reception using different transmission characteristics
JP7121025B2 (en) * 2017-09-26 2022-08-17 サトーホールディングス株式会社 printer
US10652743B2 (en) 2017-12-21 2020-05-12 The Chamberlain Group, Inc. Security system for a moveable barrier operator
US11074773B1 (en) 2018-06-27 2021-07-27 The Chamberlain Group, Inc. Network-based control of movable barrier operators for autonomous vehicles
US11423717B2 (en) 2018-08-01 2022-08-23 The Chamberlain Group Llc Movable barrier operator and transmitter pairing over a network
US10997810B2 (en) 2019-05-16 2021-05-04 The Chamberlain Group, Inc. In-vehicle transmitter training

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1595797A (en) * 1978-04-21 1981-08-19 Pushman Hugh John Security systems
EP0106273B1 (en) * 1982-10-11 1987-05-13 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Safety device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1595797A (en) * 1978-04-21 1981-08-19 Pushman Hugh John Security systems
EP0106273B1 (en) * 1982-10-11 1987-05-13 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Safety device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219060A2 (en) * 1985-10-11 1987-04-22 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Security device for an automotive vehicle
EP0219060A3 (en) * 1985-10-11 1988-08-24 Bayerische Motoren Werke Aktiengesellschaft Security device for an automotive vehicle

Also Published As

Publication number Publication date
JPS6010081A (en) 1985-01-19
DE3320721A1 (en) 1984-12-13
EP0128457A3 (en) 1987-07-22

Similar Documents

Publication Publication Date Title
EP0128457A2 (en) Coding method for an electronic key
DE3244049C2 (en) Central locking system for a motor vehicle
EP0523117B1 (en) Central locking installation for a motor vehicle
DE69530635T2 (en) Rolling code encryption process for a remote controlled keyless entry system
DE3905651C2 (en)
DE4204463C2 (en) Identification information transceiver
WO1995009746A1 (en) Locking system, in particular for motor vehicles
DE3639715C2 (en) Remote control for vehicle locks
EP0257376A1 (en) Electronic locking system comprising at least a lock, particularly for motor cars
EP0103791A2 (en) Coding method for an electronic key
DE3300732A1 (en) CENTRAL LOCKING SYSTEM FOR A MOTOR VEHICLE
EP0154019B1 (en) Coding method for an electronic key
EP0155378B1 (en) Coding method for an electronic key
EP1276945B1 (en) Securing method, interrogation unit and securing system for implementing the securing method
EP0103790A2 (en) Coding method for an electronic key
EP0219060B1 (en) Security device for an automotive vehicle
DE10112573C2 (en) Method for initializing an anti-theft system for a motor vehicle
EP0923054B1 (en) Method and device for checking the usage right for access control devices
DE4238858C1 (en) Centralised locking system for motor vehicle - uses synchronised clock pulse counters in both coder and decoder set to same initial count via random number generator
DE4416705C1 (en) Electronic security device and method for operating it
DE3324956A1 (en) Circuit arrangement for electronically locking and unlocking safety systems
DE4227887C1 (en) Vehicle remote central door locking system - uses code-timing generators with synchronised code pulse counters in transmitter and receiver for variable code-word recognition.
EP1254042B1 (en) Method for operating an anti-theft device for a motor vehicle, and anti-theft system
DE19546350C2 (en) Anti-theft engine control device for vehicles
DE10202802B4 (en) Data transfer system

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB IT SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT SE

17P Request for examination filed

Effective date: 19880222

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19900413

RIN1 Information on inventor provided before grant (corrected)

Inventor name: DANNHAEUSER, FRIEDRICH, DR.