EP0081765A2 - Theft protection device for motor vehicles - Google Patents

Theft protection device for motor vehicles Download PDF

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Publication number
EP0081765A2
EP0081765A2 EP82111179A EP82111179A EP0081765A2 EP 0081765 A2 EP0081765 A2 EP 0081765A2 EP 82111179 A EP82111179 A EP 82111179A EP 82111179 A EP82111179 A EP 82111179A EP 0081765 A2 EP0081765 A2 EP 0081765A2
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EP
European Patent Office
Prior art keywords
signal
transmitter
receiver
code signal
code
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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.)
Granted
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EP82111179A
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German (de)
French (fr)
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EP0081765B1 (en
EP0081765B2 (en
EP0081765A3 (en
Inventor
Arnost Proske
Walter Weishaupt
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Priority claimed from DE19813149259 external-priority patent/DE3149259A1/en
Priority claimed from DE19823240945 external-priority patent/DE3240945A1/en
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0081765A2 publication Critical patent/EP0081765A2/en
Publication of EP0081765A3 publication Critical patent/EP0081765A3/en
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    • GPHYSICS
    • G07CHECKING-DEVICES
    • G07CTIME 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
    • G07C9/00Individual registration on entry or exit
    • G07C9/00174Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00182Electronically 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
    • GPHYSICS
    • G07CHECKING-DEVICES
    • G07CTIME 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
    • G07C9/00Individual registration on entry or exit
    • G07C9/00174Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00753Electronically 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
    • G07C2009/00769Electronically 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
    • G07C2009/00785Electronically 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 an anti-theft device for motor vehicles, with a first transmitter for wireless and contactless transmission of a code signal to a receiver arranged in or on the vehicle, which allows the motor vehicle to be used when the code signal matches a stored code signal, such as it is known from DE-OS 24 37 314.
  • the transmission can take place in an electromagnetic, acoustic or optical way.
  • a third way also known from DE-OS 29 26 304, is to reduce the spread of the transmitter. Since this reduction, owing to the physical properties of the transmitter, can never lead to an only punctiform transmission beam or there is always a certain spread, it is also possible to listen to the code signal here. On the other hand, even with a point-like transmission beam, the targeting of the receiver would be almost impossible and the use of the safety device would therefore be made considerably more difficult.
  • the invention has for its object to ensure effective protection of the security device from unauthorized persons in a simple manner.
  • the invention solves this problem by a second transmitter for a similar second signal, the orientation of which is chosen differently from that of the transmitter for the code signal so that when the code signal transmitter is aligned with the receiver, the second signal does not reach the receiver or is only weakened considerably.
  • the receiver only receives the code signal if it is aligned accordingly. in the area surrounding the motor vehicle, on the other hand, code and second signals are superimposed. If this signal resulting from the superimposition of the two signals is directed at the receiver by an unauthorized person, this signal is different from the code signal and the use of the motor vehicle is therefore not possible.
  • the second signal can be designed in various ways. It can be an interference signal. If, for example, the transmitted code consists of the sequence of identical transmission pulses with a variable sequence corresponding to the code with two defined intervals, the interference signal consists, for example, of a sequence of at least equally long pulses with the same interval. This distance is equal to the smaller of the two distances of the pulse train of the code signal.
  • the second signal can be another code signal which, when the transmitter for the (first) code signal is aligned with the associated (first) receiver, meets a second receiver in or on the motor vehicle.
  • the two code signals are superimposed outside the motor vehicle. The two signals can no longer be separated from one another, so that the unauthorized sensor of this superimposition of the two code signals cannot use the motor vehicle either.
  • the mode of operation of the second signal can be considerably improved by arranging the second transmitter in or on the motor vehicle.
  • the second transmitter Due to the rigid arrangement of the second transmitter, it is readily possible to have the latter transmit a second signal which does not reach the receiver, but otherwise reaches all locations outside the receiver. It is thus possible to cover the entire space outside the receiver with the second signal without gaps.
  • the second transmitter can be arranged at different locations in or on the motor vehicle.
  • the location of the receiver itself represents a particularly advantageous location. In this way, the condition of transmitting the second signal to all locations outside the receiver can be met in a particularly elegant manner.
  • the operating mode of the second transmitter can also be selected differently.
  • One of these options is to operate the second transmitter continuously. Against. it is much cheaper in terms of energy technology to activate the second transmitter with the first transmitter.
  • the second transmitter only works approximately when the first transmitter transmits its code signal. This offers the additional advantage that either the superimposition of code and second signal or only the second signal alone can be received at locations outside the receiver for a short time.
  • the second signal is difficult to analyze. This analysis can be further complicated by the fact that the second signal is modified each time it is transmitted compared to the last time.
  • the second transmitter can be activated in various ways by the first transmitter. It is thus possible for the first transmitter to send an activation signal before the actual code signal, after receiving which the second transmitter sends the second signal for a predetermined time within which the code signal occurs. An improved adaptation of the second to the code signal can be achieved in that the second transmitter is itself activated by the code signal emitted by the first transmitter. The second transmitter starts to work when the code signal arrives and ends when the code signal is also finished.
  • An anti-theft device for motor vehicles consists of a receiver 2 arranged in the motor vehicle 1, which is followed by a code comparator 3. This is connected to a memory 4 for a stored code signal and controls, for example, relay 6 for unlocking or locking the doors or flaps of the motor vehicle, not shown, with the aid of a schematically illustrated switch 5.
  • the user of the motor vehicle can transmit a code signal in the form of a radio, ultrasound or infrared signal with the aid of a mobile transmission device 7.
  • a transmitter 8 is used, which emits a sequence of similar pulses when a switch 9 is actuated.
  • the impulses are sent out at two different intervals according to the embossed code.
  • Such a pulse sequence is shown schematically and labeled I.
  • the transmitting device 7 also has a transmitter 10 with which a similar interference signal II is simultaneously emitted when the key switch 9 is actuated.
  • This interference signal consists of a sequence of pulses of the same length and strength as in the code signal I, the distance between which is chosen to be the smaller of the two distances for the pulses of the code signal I.
  • the code signal emitted by the transmitter 8 is superimposed with a second signal outside the motor vehicle in the device as shown schematically in FIG. 2.
  • the second signal is a second code signal to which a second receiver 2 'is assigned in addition to the receiver 2 for the first code signal from the transmitter 8 and a second code memory 4'.
  • the alignment of the two transmitters 8 and 10 is chosen so that their emitted code signals can be directed individually to the two receivers 2 and 2 'without interference. Outside the motor vehicle, however, the two code signals are superimposed or separated. It is therefore not possible to distinguish between the two code signals outside the motor vehicle, or the two signals cannot be recorded at the same place at the same time. The use of the motor vehicle is therefore also not possible for an unauthorized person.
  • this superimposition of the two code signals is shown schematically.
  • the two transmitters 8 and 10 emit code signals, for example, as shown in the diagram opposite and designated I and I '.
  • the superimposition of the code signals outside the motor vehicle is designated III.
  • the invention shows a surprisingly simple way, the intercepted signal to render it worthless by distinguishing it from the code signal or signals received in the motor vehicle.
  • a transmitter 10 ' is located approximately at the location of the receiver 2, with which a similar interference signal is emitted simultaneously with the code signal.
  • This interference signal consists of a sequence of pulses of the same length and strength as in the code signal, the distance between which is chosen to be the smaller of the two distances for the pulses of the code signal.
  • the transmitter 10 ' is activated by the code signal of the transmitter 8 that occurs.
  • a signal generator 11 is connected to the receiver 2, which is activated by the code signal occurring and operates the transmitter 10 'until the end of the code signal.
  • the position of the transmitter 10 'relative to the receiver 2 and its transmission range is selected so that the interference signal emitted by the transmitter 10' cannot get into the receiver 2, but otherwise at any point outside of the receiver 2.

Abstract

1. Anti-theft security apparatus for motor vehicles, having a first transmitter for the wire-less and contact-less transmission of a code signal to a receiver situated in or on the vehicle which renders use of the motor vehicle possible in the case of conformity of the code signal with a stored code signal characterised by a second transmitter for a second signal of like nature, the orientation of which is differently selected from that of the transmitter (8) for the code signal (I) in such a way that, if the code signal transmitter (8) is orientated to the receiver (2), the second signal arrives only considerably attenuated or not at all at the receiver (2).

Description

Die Erfindung bezieht sich auf eine Diebstahl-Sicherungsvorrichtung für Kraftfahrzeuge, mit einem ersten Sender zur draht- und kontaktlosen übertragung eines Codesignals auf einen im bzw. am Fahrzeug angeordneten Empfänger, der bei Übereinstimmung des Codesignals mit einem gespeicherten Codesignal ein Benutzen des Kraftfahrzeugs ermöglicht, wie sie aus der DE-OS 24 37 314 bekannt ist. Die übertragung kann dabei auf elektromagnetischem, akustischem oder optischem Weg erfolgen.The invention relates to an anti-theft device for motor vehicles, with a first transmitter for wireless and contactless transmission of a code signal to a receiver arranged in or on the vehicle, which allows the motor vehicle to be used when the code signal matches a stored code signal, such as it is known from DE-OS 24 37 314. The transmission can take place in an electromagnetic, acoustic or optical way.

Zum Schutz vor einer mißbräuchlichen Benutzung wurden bisher unterschiedliche Wege beschritten. Eine Überlegung beruht darauf, den Schutz durch eine Erhöhung der Codemöglichkeiten zu vergrößern. Dabei ist beispielsweise eine Vielzahl von Möglichkeiten vorgesehen, deren Ausprobieren eine erhebliche Zeit in Anspruch nimmt. Ein anderer Weg beruht auf der Tatsache, daß das ausgesandte Codesignal in nie zu vermeidender Weise streut und daher auch außerhalb des Kraftfahrzeugs abgehört werden könnte. Hierzu wurde vorgeschlagen (DE-OS 29 26 304), dem Codesignal ein gleichartiges Störsignal zu überlagern. Das außerhalb des Kraftfahrzeugs - unbefugterweise - empfangene Signal ist identisch mit dem Signal am Ort des Empfängers im Kraftfahrzeug und besteht aus der überlagerung von Code- und Störsignal. Es ist also identisch mit einem Signal, das von einem einzigen Sender ausgesandt wird und dessen Inhalt dem von Code- und Störsignal entspricht. Wird dieses Signal nun außerhalb des Kraftfahrzeugs aufgenommen und auf den Empfänger im Kraftfahrzeug gerichtet, so ist dieses Signal für den Empfänger identisch mit dem Signal, das von dem befugten Benutzer des Kraftfahrzeugs ausgesandt wird und ermöglicht für den Unbefugten ebenfalls das Benutzen des Kraftfahrzeugs.To protect against misuse, different approaches have so far been followed. One consideration is to increase protection by increasing the number of code options. A variety of options are provided, for example, and trying them out takes a considerable amount of time. Another way is based on the fact that the transmitted code signal scatters in an unavoidable manner and could therefore also be monitored outside the motor vehicle. For this purpose, it was proposed (DE-OS 29 26 304) to superimpose a similar interference signal on the code signal. The signal received outside the motor vehicle - unauthorized - is identical to the signal at the location of the receiver in the motor vehicle and consists of the superimposition of code and interference signal. It is therefore identical to a signal which is emitted by a single transmitter and whose content corresponds to that of the code and interference signal. Becomes If this signal is now received outside the motor vehicle and is directed at the receiver in the motor vehicle, this signal for the receiver is identical to the signal which is emitted by the authorized user of the motor vehicle and also enables the unauthorized person to use the motor vehicle.

Ein dritter, ebenfalls aus der DE-OS 29 26 304 bekannter Weg besteht darin, die Streubreite des Senders zu verringern. Da diese Verringerung, bedingt durch die physikalischen Eigenschaften des Senders, nie zu einem nur punktförmigen Sendestrahl führen kann bzw. stets eine gewisse Streubreite vorhanden ist, ist auch hier das Abhören des Codesignals möglich. Andererseits würde auch bei einem punktförmigen Sendestrahl die Anpeilung des Empfängers nahezu unmöglich und daher die Benutzung der Sicherungsvorrichtung erheblich erschwert werden.A third way, also known from DE-OS 29 26 304, is to reduce the spread of the transmitter. Since this reduction, owing to the physical properties of the transmitter, can never lead to an only punctiform transmission beam or there is always a certain spread, it is also possible to listen to the code signal here. On the other hand, even with a point-like transmission beam, the targeting of the receiver would be almost impossible and the use of the safety device would therefore be made considerably more difficult.

Der Erfindung liegt die Aufgabe zugrunde, auf einfache Weise einen wirksamen Schutz der Sicherungsvorrichtung vor Unbefugten zu gewährleisten.The invention has for its object to ensure effective protection of the security device from unauthorized persons in a simple manner.

Die Erfindung löst diese Aufgabe durch einen zweiten Sender für ein gleichartiges Zweitsignal, dessen Orientierung unterschiedlich von der des Senders für das Codesignal so gewählt ist, daß bei Ausrichtung des Codesignal-Senders auf den Empfänger das Zweitsignal nicht oder nur erheblich abgeschwächt auf den Empfänger gelangt.The invention solves this problem by a second transmitter for a similar second signal, the orientation of which is chosen differently from that of the transmitter for the code signal so that when the code signal transmitter is aligned with the receiver, the second signal does not reach the receiver or is only weakened considerably.

Der Empfänger erhält bei entsprechender Ausrichtung lediglich das Codesignal. in der Umgebung des Kraftfahrzeugs hingegen kommt es zur Überlagerung von Code- und Zweitsignal. Wird dieses, aus der überlagerung der beiden Signale entstehende Signal - durch einen Unbefugten - auf den Empfänger gerichtet, so ist dieses Signal vom Codesignal verschieden und die Benutzung des Kraftfahrzeugs daher nicht möglich.The receiver only receives the code signal if it is aligned accordingly. in the area surrounding the motor vehicle, on the other hand, code and second signals are superimposed. If this signal resulting from the superimposition of the two signals is directed at the receiver by an unauthorized person, this signal is different from the code signal and the use of the motor vehicle is therefore not possible.

Das Zweitsignal kann in verschiedener Weise ausgebildet sein. Es kann ein Störsignal sein. Besteht der ausgesandte Code beispielsweise in der Aufeinanderfolge gleichartiger Sendeimpulse mit entsprechend dem Code variabler Folge mit zwei definierten Abständen, so besteht das Störsignal beispielsweise in einer Folge von mindestens gleichlangen Impulsen mit gleichem Abstand. Dieser Abstand ist gleich dem kleineren der beiden Abstände der Impulsfolge des Codesignals.The second signal can be designed in various ways. It can be an interference signal. If, for example, the transmitted code consists of the sequence of identical transmission pulses with a variable sequence corresponding to the code with two defined intervals, the interference signal consists, for example, of a sequence of at least equally long pulses with the same interval. This distance is equal to the smaller of the two distances of the pulse train of the code signal.

Alternativ zum Störsignal kann das Zweitsignal ein anderes Codesignal sein, das bei Ausrichten des Senders für das (erste) Codesignal auf den zugehörigen (ersten) Empfänger auf einen zweiten Empfänger im bzw. am Kraftfahrzeug trifft. Auch hier kommt es außerhalb des Kraftfahrzeugs zur Überlagerung der beiden Codesignale. Die beiden Signale können nicht mehr voneinander getrennt werden, so daß der unbefugte Aufnehmer dieser Überlagerung der beiden Codesignale das Kraftfahrzeug ebenfalls nicht benutzen kann.As an alternative to the interference signal, the second signal can be another code signal which, when the transmitter for the (first) code signal is aligned with the associated (first) receiver, meets a second receiver in or on the motor vehicle. Here, too, the two code signals are superimposed outside the motor vehicle. The two signals can no longer be separated from one another, so that the unauthorized sensor of this superimposition of the two code signals cannot use the motor vehicle either.

Die Wirkungsweise des Zweitsignals kann dadurch erheblich verbessert werden, daß der zweite Sender im oder am Kraftfahrzeug angeordnet ist.The mode of operation of the second signal can be considerably improved by arranging the second transmitter in or on the motor vehicle.

Durch die starre Anordnung des zweiten Senders ist es ohne weiteres möglich, diesen ein Zweitsignal aussenden zu lassen, das nicht auf den Empfänger, ansonsten aber an alle Stellen außerhalb des Empfängers gelangt. Es ist damit möglich, den gesamten Raum außerhalb des Empfängers lückenlos mit dem Zweitsignal zu belegen.Due to the rigid arrangement of the second transmitter, it is readily possible to have the latter transmit a second signal which does not reach the receiver, but otherwise reaches all locations outside the receiver. It is thus possible to cover the entire space outside the receiver with the second signal without gaps.

Der zweite Sender kann an verschiedenen Orten im oder am Kraftfahrzeug angeordnet sein. Eine besonders vorteilhafte Stelle stellt der Ort des Empfängers selbst dar. Auf diese Weise kann die Bedingung, das Zweitsignal an alle Stellen außerhalb des Empfängers auszusenden, auf besonders elegante Weise erfüllt werden.The second transmitter can be arranged at different locations in or on the motor vehicle. The location of the receiver itself represents a particularly advantageous location. In this way, the condition of transmitting the second signal to all locations outside the receiver can be met in a particularly elegant manner.

Die Betriebsart des zweiten Senders kann ebenfalls unterschiedlich gewählt sein. Eine dieser Möglichkeiten besteht darin, den zweiten Sender dauernd zu betreiben. Demgegen-. über ist es energietechnisch wesentlich günstiger, den zweiten Sender durch den ersten Sender zu aktivieren. Der zweite Sender arbeitet in etwa nur dann, wenn der erste Sender sein Codesignal aussendet. Dies bietet den zusätzlichen Vorteil, daß an Stellen außerhalb des Empfängers nur kurzzeitig entweder die überlagerung von Code- und Zweitsignal oder nur das Zweitsignal allein empfangen werden kann. Das Zweitsignal kann dabei nur schwer analysiert werden. Diese Analyse kann weiter dadurch erschwert werden, daß das Zweitsignal bei jedem Aussenden gegenüber dem letzten Mal modifiziert wird.The operating mode of the second transmitter can also be selected differently. One of these options is to operate the second transmitter continuously. Against. it is much cheaper in terms of energy technology to activate the second transmitter with the first transmitter. The second transmitter only works approximately when the first transmitter transmits its code signal. This offers the additional advantage that either the superimposition of code and second signal or only the second signal alone can be received at locations outside the receiver for a short time. The second signal is difficult to analyze. This analysis can be further complicated by the fact that the second signal is modified each time it is transmitted compared to the last time.

Die Aktivierung des zweiten Senders durch den ersten Senders kann in verschiedener Weise erfolgen. So ist es möglich, daß der erste Sender vor dem eigentlichen Codesignal ein Aktivierungssignal aussendet, nach dessen Empfang der zweite Sender das Zweitsignal für eine vorgegebene Zeit, innerhalb der das Codesignal auftritt, aussendet. Eine verbesserte Anpassung des Zweit- an das Codesignal läßt sich dadurch erreichen, daß der zweite Sender durch das vom ersten Sender ausgesandte Codesignal selbst aktiviert ist. Der zweite Sender beginnt bei Eintreffen des Codesignals zu arbeiten und beendet seine Arbeit, wenn das Codesignal ebenfalls beendet ist.The second transmitter can be activated in various ways by the first transmitter. It is thus possible for the first transmitter to send an activation signal before the actual code signal, after receiving which the second transmitter sends the second signal for a predetermined time within which the code signal occurs. An improved adaptation of the second to the code signal can be achieved in that the second transmitter is itself activated by the code signal emitted by the first transmitter. The second transmitter starts to work when the code signal arrives and ends when the code signal is also finished.

Die Erfindung ist anhand der Zeichnung näher erläutert. Dabei zeigen

  • Fig. 1 eine abhörsichere Diebstahl-Sicherungsvorrich-- tung für Kraftfahrzeuge und
  • Fig. 2 eine Alternative zur Vorrichtung von Fig. 1 ebenfalls in schematischer Form
  • Fig. 3 eine weitere Alternative zur Vorrichtung von Fig. 1.
The invention is explained in more detail with reference to the drawing. Show
  • Fig. 1 is a tap-proof theft protection device for motor vehicles and
  • Fig. 2 shows an alternative to the device of Fig. 1 also in schematic form
  • 3 shows a further alternative to the device from FIG. 1.

Eine Diebstahl-Sicherungsvorrichtung für Kraftfahrzeuge besteht aus einem im Kraftfahrzeug 1 angeordneten Empfänger 2, dem ein Codevergleicher 3 nachgeschaltet ist. Dieser ist mit einem Speicher 4 für ein gespeichertes Codesignal verbunden und steuert mit Hilfe eines schematisch dargestellten Schalters 5 beispielsweise Relais 6 zur Ent- bzw. Verriegelung der nicht dargestellten Türen bzw. Klappen des Kraftfahrzeugs.An anti-theft device for motor vehicles consists of a receiver 2 arranged in the motor vehicle 1, which is followed by a code comparator 3. This is connected to a memory 4 for a stored code signal and controls, for example, relay 6 for unlocking or locking the doors or flaps of the motor vehicle, not shown, with the aid of a schematically illustrated switch 5.

Der Benutzer des Kraftfahrzeugs kann mit Hilfe einer mobilen Sendeeinrichtung 7 ein Codesignal in Form eines Funk-, Ultraschall- bzw. Infrarotsignals aussenden. Hierzu dient ein Sender 8, der bei Betätigen eines Schalters 9 eine Folge gleichartiger Impulse aussendet. Die Impulse werden entsprechend dem aufgeprägten Code mit zwei verschiedenen zeitlichen Abständen ausgesandt. Eine derartige Impulsfolge ist schematisch dargestellt und mit I bezeichnet.The user of the motor vehicle can transmit a code signal in the form of a radio, ultrasound or infrared signal with the aid of a mobile transmission device 7. For this purpose, a transmitter 8 is used, which emits a sequence of similar pulses when a switch 9 is actuated. The impulses are sent out at two different intervals according to the embossed code. Such a pulse sequence is shown schematically and labeled I.

Die Sendeeinrichtung 7 besitzt ferner einen Sender 10, mit dem bei Betätigen des Tastschalters 9 gleichzeitig ein gleichartiges Störsignal II ausgesandt wird. Dieses Störsignal besteht aus einer Folge von Impulsen gleicher Länge und Stärke wie beim Codesignal I, deren Abstand gleich dem kleineren der beiden Abstände für die Impulse des Codesignals I gewählt ist.The transmitting device 7 also has a transmitter 10 with which a similar interference signal II is simultaneously emitted when the key switch 9 is actuated. This interference signal consists of a sequence of pulses of the same length and strength as in the code signal I, the distance between which is chosen to be the smaller of the two distances for the pulses of the code signal I.

Während am Ort des Empfängers 2 bei entsprechender Ausrichtung der Sendeeinrichtung 7 lediglich das Codesignal I auftrifft und bei übereinstimmung mit dem im Codespeicher 4 enthaltenen gespeicherten Codesignal zur Ent- bzw. Verriegelung des Kraftfahrzeugs durch die Vergleichseinrichtung 3 führt, kann außerhalb des Kraftfahrzeugs lediglich die überlagerung der beiden Signale I und II empfangen werden. Diese Überlagerung ist identisch mit dem Störsignal II und besteht aus einer Folge von Impulsen gleichen Abstands. Für den Unbefugten ist daher das Codesignal I nicht erkennbar. Richtet er das von ihm empfangene Signal auf den Empfänger 2, so ist dieses Signal nicht identisch mit dem gespeicherten Codesignal und kann daher nicht zur Entriegelung des Kraftfahrzeugs führen.While only the code signal I arrives at the location of the receiver 2 with a corresponding orientation of the transmission device 7 and, in accordance with the stored code signal contained in the code memory 4, leads to the unlocking or locking of the motor vehicle by the comparison device 3, only the superimposition of the motor vehicle outside of the motor vehicle can take place both signals I and II are received. This superposition is identical to the interference signal II and consists of a sequence of impulses the same Distance. The code signal I is therefore not recognizable to the unauthorized person. If he directs the signal he has received at the receiver 2, this signal is not identical to the stored code signal and therefore cannot lead to the motor vehicle being unlocked.

Entsprechend Fig. 1 wird bei der Vorrichtung, wie sie in Fig. 2 schematisch dargestellt ist, außerhalb des Kraftfahrzeugs das vom Sender 8 ausgesandte Codesignal mit einem Zweitsignal überlagert. Das Zweitsignal ist dabei ein zweites Codesignal, dem ein zweiter Empfänger 2' neben dem Empfänger 2 für das erste, vom Sender 8 stammende Codesignal und ein zweiter Codespeicher 4' zugeordnet ist. Die Ausrichtung der beiden Sender 8 und 10 ist dabei so gewählt, daß ihre ausgesandten Codesignale ohne störende überlagerung individuell auf die beiden Empfänger 2 und 2' gerichtet werden können. Außerhalb des Kraftfahrzeugs kommt es jedoch zu einer überlagerung bzw. einer Trennung der beiden Codesignale. Außerhalb des Kraftfahrzeugs kann daher nicht zwischen den beiden Codesignalen unterschieden werden, bzw. können beide Signale nicht gleichzeitig an einem Ort aufgenommen werden. Eine Benutzung des Kraftfahrzeugs ist für einen Unbefugten daher ebenfalls nicht möglich.According to FIG. 1, the code signal emitted by the transmitter 8 is superimposed with a second signal outside the motor vehicle in the device as shown schematically in FIG. 2. The second signal is a second code signal to which a second receiver 2 'is assigned in addition to the receiver 2 for the first code signal from the transmitter 8 and a second code memory 4'. The alignment of the two transmitters 8 and 10 is chosen so that their emitted code signals can be directed individually to the two receivers 2 and 2 'without interference. Outside the motor vehicle, however, the two code signals are superimposed or separated. It is therefore not possible to distinguish between the two code signals outside the motor vehicle, or the two signals cannot be recorded at the same place at the same time. The use of the motor vehicle is therefore also not possible for an unauthorized person.

Wie in Fig. 1 ist diese überlagerung der beiden Codesignale schematisch dargestellt. Die beiden Sender 8 und 10 senden beispielsweise Codesignale aus, wie sie im nebenstehenden Diagramm dargestellt und mit I und I' bezeichnet sind. Die überlagerung der Codesignale außerhalb des Kraftfahrzeugs ist mit III bezeichnet. Auch hier ist ohne weiteres zu erkennen, daß die beiden Codesignale nicht auseinander gehalten werden können.As in FIG. 1, this superimposition of the two code signals is shown schematically. The two transmitters 8 and 10 emit code signals, for example, as shown in the diagram opposite and designated I and I '. The superimposition of the code signals outside the motor vehicle is designated III. Here, too, it can easily be seen that the two code signals cannot be kept apart.

Ausgehend von der überlegung, daß es grundsätzlich nicht möglich ist, ein Abhören des draht- bzw. kontaktlos ausgesandten Codesignals zu verhindern, zeigt die Erfindung einen überraschend einfachen Weg auf, das abgehörte Signal wertlos zu machen, indem es sich von dem bzw. den im Kraftfahrzeug empfangenen Codesignalen unterscheidet.Starting from the consideration that it is fundamentally not possible to prevent the wired or contactlessly transmitted code signal from being intercepted, the invention shows a surprisingly simple way, the intercepted signal to render it worthless by distinguishing it from the code signal or signals received in the motor vehicle.

Beim Ausführungsbeispiel von Fig. 3 sitzt etwa am Ort des Empfängers 2 ein Sender 10', mit dem gleichzeitig mit dem Codesignal ein gleichartiges Störsignal ausgesandt wird. Dieses Störsignal besteht aus einer Folge von Impulsen gleicher Länge und Stärke wie beim Codesignal, deren Abstand gleich dem kleineren der beiden Abstände für die Impulse des Codesignals gewählt ist.In the embodiment of FIG. 3, a transmitter 10 'is located approximately at the location of the receiver 2, with which a similar interference signal is emitted simultaneously with the code signal. This interference signal consists of a sequence of pulses of the same length and strength as in the code signal, the distance between which is chosen to be the smaller of the two distances for the pulses of the code signal.

Der Sender 10' wird durch das auftretende Codesignal des Senders 8 aktiviert. Hierzu ist an den Empfänger 2 ein Signalerzeuger 11 angeschlossen, der durch das auftretende Codesignal aktiviert ist und den Sender 10' bis zum Ende des Codesignals betreibt. Die Lage des Senders 10' relativ zum Empfänger 2 und dessen Sendebereich ist so gewählt, daß das vom Sender 10' ausgesandte Störsignal nicht in den Empfänger 2, ansonsten aber an beliebigen Stellen außerhalb des Empfängers 2 gelangen kann.The transmitter 10 'is activated by the code signal of the transmitter 8 that occurs. For this purpose, a signal generator 11 is connected to the receiver 2, which is activated by the code signal occurring and operates the transmitter 10 'until the end of the code signal. The position of the transmitter 10 'relative to the receiver 2 and its transmission range is selected so that the interference signal emitted by the transmitter 10' cannot get into the receiver 2, but otherwise at any point outside of the receiver 2.

Damit kann an allen Stellen außerhalb des Empfängers 2 entweder nur kurzzeitig das Störsignal des Senders 10' allein oder innerhalb des Sendekegels des Senders 8 dieses überlagert mit dem Codesignal empfangen werden. Auf keinen Fall und unabhängig vom Ort, an dem die Sendeeinrichtung 7 das Codesignal aussendet, kann außerhalb des Empfängers 2 dieses Codesignal allein empfangen werden. Es ist daher für einen Unbefugten nicht möglich, das Codesignal allein aufzunehmen und durch dessen Aussenden unbefugt das Kraftfahrzeug zu benutzen.,This means that at all points outside of the receiver 2 the interference signal from the transmitter 10 'can either be received only briefly or can be received within the transmitter cone of the transmitter 8 superimposed on it with the code signal. In no case and regardless of the location at which the transmitting device 7 transmits the code signal, this code signal alone can be received outside the receiver 2. It is therefore not possible for an unauthorized person to record the code signal alone and to use the motor vehicle without authorization by sending it out.

An Stelle des Aussendens des Zweitsignals nur während der Dauer des Codesignals ist beispielsweise auch ein Dauerbetrieb oder ein häufiger kurzzeitiger Betrieb des Senders 10' unabhängig vom Aussenden des Codesignals möglich. Dies bietet den Vorteil, daß das Codesignal auch in den Fällen, in denen es nicht auf den Empfänger 2 gelangt und im beschriebenen Fall den Sender 10' aktiviert, mit dem Störsignal überlagert ist. Die Überlagerung des Codesignals mit dem Störsignal ist damit unabhängig von der Ziel- bzw. Treffgenauigkeit des berechtigten Fahrzeugbenutzers.Instead of transmitting the second signal only during the duration of the code signal, continuous operation or frequent short-term operation of the transmitter 10 'is also possible, for example, regardless of the transmission of the code signal. This has the advantage that the code signal even in the cases where it does not reach the receiver 2 and in be Written case activated the transmitter 10 ', with the interference signal is superimposed. The superimposition of the code signal with the interference signal is therefore independent of the target or hit accuracy of the authorized vehicle user.

Claims (7)

1. Diebstahl-Sicherungsvorrichtung für Kraftfahrzeuge, mit einem ersten Sender zur draht- und kontaktlosen übertragung eines Codesignals auf einen im bzw. am Fahrzeug angeordneten Empfänger, der bei Übereinstimmung des Codesignals mit einem gespeicherten Codesignal ein Benutzen des Kraftfahrzeugs ermöglicht, gekennzeichnet durch einen zweiten Sender für ein gleichartiges Zweitsignal, dessen Orientierung unterschiedlich von der des Senders (8) für das Codesignal (I) so gewählt ist, daß bei Ausrichtung des Codesignal-Senders (8) auf den Empfänger (2) das Zweitsignal nicht oder nur erheblich abgeschwächt auf den Empfänger (2) gelangt.1. Anti-theft device for motor vehicles, with a first transmitter for wireless and contactless transmission of a code signal to a receiver arranged in or on the vehicle, which allows the motor vehicle to be used if the code signal matches a stored code signal, characterized by a second transmitter for a similar second signal, the orientation of which is different from that of the transmitter (8) for the code signal (I) so that when the code signal transmitter (8) is aligned with the receiver (2) the second signal is not weakened or is only significantly weakened Receiver (2) arrives. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Zweitsignal ein Störsignal (II) ist.2. Device according to claim 1, characterized in that the second signal is an interference signal (II). 3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Zweitsignal ein anderes gleichartiges Codesignal (I') ist, das bei Ausrichtung des ersten Senders (8) für das (erste) Codesignal (I) auf den zugehörigen (ersten) Empfänger (2) auf einen zweiten Empfänger (2') im bzw. am Kraftfahrzeug (1) trifft.3. Apparatus according to claim 1, characterized in that the second signal is another similar code signal (I ') which, when the first transmitter (8) is aligned for the (first) code signal (I) on the associated (first) receiver (2nd ) meets a second receiver (2 ') in or on the motor vehicle (1). 4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der zweite Sender (10') im oder am Kraftfahrzeug (1) angeordnet ist.4. Device according to one of claims 1 to 3, characterized in that the second transmitter (10 ') is arranged in or on the motor vehicle (1). 5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der zweite Sender (10') etwa am Ort des Empfängers (2) sitzt.5. The device according to claim 4, characterized in that the second transmitter (10 ') sits approximately at the location of the receiver (2). 6. Vorrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß der zweite Sender (10') durch den ersten Sender (8) aktiviert ist.6. Apparatus according to claim 4 or 5, characterized in that the second transmitter (10 ') is activated by the first transmitter (8). 7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß der zweite Sender (10) durch das vom ersten Sender (8) ausgesandte Codesignal aktiviert ist.7. The device according to claim 6, characterized in that the second transmitter (10) is activated by the code signal emitted by the first transmitter (8).
EP19820111179 1981-12-11 1982-12-02 Theft protection device for motor vehicles Expired - Lifetime EP0081765B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19813149259 DE3149259A1 (en) 1981-12-11 1981-12-11 Anti-theft device for motor vehicles
DE3149259 1981-12-11
DE19823240945 DE3240945A1 (en) 1982-11-05 1982-11-05 ANTI-THEFT SECURITY DEVICE FOR MOTOR VEHICLES
DE3240945 1982-11-05

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EP0081765A2 true EP0081765A2 (en) 1983-06-22
EP0081765A3 EP0081765A3 (en) 1984-02-08
EP0081765B1 EP0081765B1 (en) 1986-04-02
EP0081765B2 EP0081765B2 (en) 1991-07-03

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EP19820111179 Expired - Lifetime EP0081765B2 (en) 1981-12-11 1982-12-02 Theft protection device for motor vehicles

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DE9312460U1 (en) * 1993-08-19 1994-12-15 Siemens Ag Electronic arrangement for monitoring a condition of one or more objects, e.g. one thing and / or person
DE4340260A1 (en) * 1993-10-01 1995-04-06 Marquardt Gmbh Locking system, in particular for motor vehicles
US5841363A (en) * 1993-10-01 1998-11-24 Marquardt Gmbh Locking system especially for automobiles

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SE448803B (en) * 1986-05-22 1987-03-16 Ljungmans Ind Ab WAY TO PREVENT UNAUTHORIZED ACCESS OF INFORMATION
US4845505A (en) * 1987-02-13 1989-07-04 Toyota Jidosha Kabushiki Kaisha Automobile antenna system for diversity reception

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DE2909134A1 (en) * 1978-03-17 1979-09-20 Neiman Gmbh & Co Kg DEVICE FOR CONTROLLING A MOTOR VEHICLE LOCKING DEVICE
DE2911828A1 (en) * 1979-03-26 1980-10-16 Vdo Schindling Radio controlled door lock for vehicle - has key transmitting PCM signals to receiver in lock containing demodulator and code comparator
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DE2437314A1 (en) * 1974-08-02 1976-02-12 Thomas Schubert Electronic anti-theft switch for car - with coded light signal key and photosensitive cell on window of car
DE2909134A1 (en) * 1978-03-17 1979-09-20 Neiman Gmbh & Co Kg DEVICE FOR CONTROLLING A MOTOR VEHICLE LOCKING DEVICE
DE2911828A1 (en) * 1979-03-26 1980-10-16 Vdo Schindling Radio controlled door lock for vehicle - has key transmitting PCM signals to receiver in lock containing demodulator and code comparator
DE2926304A1 (en) * 1979-06-29 1981-01-29 Daimler Benz Ag Security lock and theft alarm for motor vehicle - has electronic transmitter and receiver linked by non-electrical circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9312460U1 (en) * 1993-08-19 1994-12-15 Siemens Ag Electronic arrangement for monitoring a condition of one or more objects, e.g. one thing and / or person
DE4340260A1 (en) * 1993-10-01 1995-04-06 Marquardt Gmbh Locking system, in particular for motor vehicles
US5841363A (en) * 1993-10-01 1998-11-24 Marquardt Gmbh Locking system especially for automobiles

Also Published As

Publication number Publication date
EP0081765B1 (en) 1986-04-02
EP0081765B2 (en) 1991-07-03
EP0081765A3 (en) 1984-02-08

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