EP0219060A2 - Security device for an automotive vehicle - Google Patents

Security device for an automotive vehicle Download PDF

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Publication number
EP0219060A2
EP0219060A2 EP86113981A EP86113981A EP0219060A2 EP 0219060 A2 EP0219060 A2 EP 0219060A2 EP 86113981 A EP86113981 A EP 86113981A EP 86113981 A EP86113981 A EP 86113981A EP 0219060 A2 EP0219060 A2 EP 0219060A2
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EP
European Patent Office
Prior art keywords
code signal
code
signal
transmitter
comparison
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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
Application number
EP86113981A
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German (de)
French (fr)
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EP0219060A3 (en
EP0219060B1 (en
Inventor
Walter Weishaupt
Arnost Proske
Michael Tigges
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.)
Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP0219060A2 publication Critical patent/EP0219060A2/en
Publication of EP0219060A3 publication Critical patent/EP0219060A3/en
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    • 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
    • G07C9/00174—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
    • 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
    • G07C2209/06—Involving synchronization or resynchronization between transmitter and receiver; reordering of codes

Definitions

  • the invention relates to a security device for a motor vehicle, in particular for access control or as theft protection, with a portable transmitter for an arbitrarily emitted code signal which is changed when it is emitted compared to the previous code signal and with a receiver arranged on the motor vehicle for the actually emitted and the expected one Code signal emits a switching signal.
  • the code signal which is emitted and which is essentially the basis of the comparison is determined after a previously matched first emitted code signal with a stored code signal as a second code signal with the aid of a random generator. This generates a question code, which is transmitted to the key and which causes the key to issue an answer code that essentially determines the second code signal.
  • the comparison device now compares this response code with the response code expected on the basis of the question code and, if the two response codes match, emits a switching signal, for example for unlocking a door lock.
  • a disadvantage of the known security device is primarily the three times transmission of a code signal, namely the previously sent code signal, the question code and the answer codes, which leads to transmission errors due to the high susceptibility to faults, particularly in motor vehicles. As a result, the rightful user of the motor vehicle is prevented from using it.
  • the transmitter since the transmitter must be designed as a transponder. He must be able to receive the question code signal sent by the motor vehicle. The same applies to the receiver arranged on the motor vehicle, which must also be able to serve as a transmitter for the question code.
  • the invention is based on the object of creating a safety device of the type mentioned at the outset, which offers the greatest possible degree of safety with regard to its function with little design effort.
  • the invention solves this problem in that the emitted code signal is reproducibly variable in accordance with an individual law of education, that the comparison device compares this code signal with a number of code signals which follow the expected code signal based on the law of education that if the emitted does not match Code signal with one of the code signals from the number of code signals, the comparison device compares a further code signal which is arbitrarily emitted by the transmitter with the code signal which follows the code signal first transmitted on the basis of the Education Act.
  • the reproducible change in the code signal in the transmitter is fundamental to the invention.
  • a "catch area" with the first number of code signals is available in the receiver, which is relatively large.
  • the reason for this is that it is possible to change the code signal of the transmitter arbitrarily, for example with the aid of a pushbutton arranged there, even when the transmitter is not used to trigger the switching signal of the safety device.
  • the code signal of the transmitter directed at the receiver does not lead to a positive result when the received code signal is compared with the first number of code signals used for comparison Recipient.
  • a single code signal can be used for a second comparison, which results from the first received code signal based on the Education Act. Unauthorized users, unless they are in possession of the Education Act, cannot generate the code signal expected by the recipient. The second comparison also does not lead to the triggering of the switching signal.
  • An advantageous improvement of the invention consists in comparing the second code signal of the transmitter with a second number of code signals of the receiver for the second comparison. This number should be significantly smaller than the number of code signals for the first comparison.
  • the decisive factor here is the consideration that the "catch area", i.e. the number of code signals used for the second comparison can be kept relatively small for the authorized vehicle user, since he sends the second code signal relatively quickly after the first code signal has been ineffectively transmitted.
  • the receiver On the basis of the law of formation of the code signals which is identical in the transmitter and receiver, the receiver "knows" which code signal is to be transmitted by the transmitter as a second code signal on the basis of the code signal received first.
  • a warning or alarm signal can then be generated which indicates an obviously abusive attempt to operate the safety device.
  • a corresponding interlock can be used to make a new comparison between a transmitted code signal and a code signal from the determined number of code signals for a predetermined time prevented.
  • a renewed comparison between a transmitted code signal and the number of code signals can be carried out, if necessary after a specified blocking time has elapsed, on the basis of the code signal originally expected by the comparison device.
  • the authorized user of the motor vehicle can already actuate the security device when the code signal is first transmitted.
  • a schematically shown motor vehicle 1 has a receiver 2 for a code signal, which is supplied by a portable transmitter 3.
  • the code signal is transmitted, for example, on an infrared or radio frequency basis.
  • a comparator 4 is connected to the receiver 2, which in turn is connected to a code signal memory 5 or alternatively to a code signal computer.
  • the comparator 4 controls, for example, a locking device 6, not shown in detail, of a lock, also not shown, and additionally, if necessary, a generally acoustic warning display.
  • the code signals supplied by the transmitter 3 and contained in the memory 5 are subject to the same individual education law, for example with regard to the pulse / pause ratio. Each code signal is in a defined relationship with the preceding and the following one. This can be given, for example, by a consecutive number.
  • the code signal received at the receiver 2 is identical to the code signal which is contained in the memory 5 and which is expected for this transmission / reception process.
  • the comparator 4 determines the correspondence of the two code signals and outputs a corresponding switching signal to the unlocking device 6.
  • the code signal is changed using the specified education law.
  • the code signal of the transmitter 3 is changed by correspondingly actuating the switch 7 a number of times and that the code signals respectively sent do not reach the receiver 2. In this case, asynchrony occurs between transmitter 3 and receiver 2.
  • the comparator 4 also delivers a corresponding switching signal for the unlocking device 6 in this case, a number (1) of code signals is present in the memory 5 for each code signal actually expected, which code signals follow the expected code signal and which are determined by the Education Act.
  • the number of these code signals is predetermined and is, for example, 20.
  • the comparator 4 compares the received code signal with one of the stored ones 20 code signals and delivers a corresponding switching signal to the unlocking device 6.
  • the comparator 4 determines the mismatch between the code signal then transmitted by the transmitter 3 and received with the receiver 2 and the stored 20 code signals and delivers the switching signal to the unlocking device 6 not.
  • a second code signal sent out by the transmitter 3 within a relatively short period of time and modified in accordance with the law on education compared to the first code signal sent is compared in the comparator 4 with a code signal that is contained in the memory 5 in a number (11) of code signals.
  • This second number of code signals is significantly smaller than the first number (1) of code signals taken into account for the first comparison.
  • the code signals of the second number result on the basis of the first code signal of the transmitter 3 recorded with the receiver on the basis of the still valid education law.
  • This second number is, for example, equal to 3.
  • the test of the second code signal of the transmitter 3 with the code signals of the second number of the memory 5 is made possible with the aid of a timing element 8 which is connected to the connection between the memory 5 and the comparator 4.
  • the timing element 8 is activated by the comparator 4 when the first comparison is carried out.
  • code signal memory 5 it is also possible to use a code signal calculator which generates the first and second number of code signals taken into account for the comparison on the basis of the code code which was decisive last or the first code signal emitted.

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

Abstract

A security device for a motor vehicle, with a portable transmitter for a radio transmitted ode signal and with a receiver in the motor vehicle, possesses essentially the following elements: The transmitter, whenever actuated, varies its code signal in a reproducible way. In the motor vehicle, this code signal is compared with an expected code signal and with a number of code signals following this. These code signals are determined according to the law of formation from the code signal critical for the preceding comparison. If the code signal received does not correspond to one of the code signals from this number of code signals, a second comparison is carried out. For this, a second code signal emitted by the transmitter and hanged according to the law of formation in relation to the first code signal transmitted and one or more code signals are compared with one another. The latter are likewise obtained according to the law of formation from the first code signal received. It is thus possible, even when there is a lack of synchronism between the transmitter and motor vehicle, to make it possible for the authorised user to us the motor vehicle.

Description

Die Erfindung bezieht sich auf eine Sicherheitseinrichtung für ein Kraftfahrzeug, insbesondere zur Zugangskontrolle oder als Dieb­stahlschutz, mit einem tragbaren Sender für ein willkürlich abzuge­bendes, bei der Abgabe gegenüber dem vorangegangenen Codesignal verändertes Codessignal und mit einem am Kraftfahrzeug angeordne­ten Empfänger für das tatsächlich ausgesandte und das erwartete Codesignal ein Schaltsignal abgibt.The invention relates to a security device for a motor vehicle, in particular for access control or as theft protection, with a portable transmitter for an arbitrarily emitted code signal which is changed when it is emitted compared to the previous code signal and with a receiver arranged on the motor vehicle for the actually emitted and the expected one Code signal emits a switching signal.

Bei einer aus der DE 33 13 098 C 1 bekannten derartigen Sicher­heitseinrichtung wird das ausgesandte und dem Vergleich im wesent­liche zugrundegelegte Codesignal nach vorhergehender Übereinstim­mung eines vorab ausgesandten ersten Codesignals mit einem gespeicherten Codesignal als zweites Codesignal mit Hilfe eines Zufallsgenerators bestimmt. Dieser erzeugt einen Fragecode, der an den Schlüssel übermittelt wird und diesen zur Abgabe eines das zweite Codesignal wesentlich bestimmenden Anwortcodes veranlaßt. Die Vergleichseinrichtung vergleicht nun diesen Antwortcode mit dem aufgrund des Fragecodes erwarteten Antwortcode und gibt bei Übereinstimmung der beiden Anwortcodes ein Schaltsignal, beispiels­weise zum Entriegeln eines Türschlosses ab.In a security device known from DE 33 13 098 C 1, the code signal which is emitted and which is essentially the basis of the comparison is determined after a previously matched first emitted code signal with a stored code signal as a second code signal with the aid of a random generator. This generates a question code, which is transmitted to the key and which causes the key to issue an answer code that essentially determines the second code signal. The comparison device now compares this response code with the response code expected on the basis of the question code and, if the two response codes match, emits a switching signal, for example for unlocking a door lock.

Nachteilig an der bekannten Sicherheitseinrichtung ist in erster Linie das dreimalige Übertragen eines Codesignals, nämlich des vorab ausgesandten Codesignals, des Fragecodes und des Antwort­ codes, was insbesondere bei Kraftfahrzeugen aufgrund der hohen Störanfälligkeit zu Übertragungsfehlern führt. Dies hat für den rechtmäßigen Benutzer des Kraftfahrzeugs zur Folge, daß er an der Benutzung behindert ist. Hinzu kommt ein erheblicher Bauauf­wand, da der Sender als Transponder ausgebildet sein muß. Er muß in der Lage sein, das vom Kraftfahrzeug ausgesandte Fragecode-­Signal zu empfangen. Dasselbe gilt für den am Kraftfahrzeug angeordneten Empfänger, der ebenfalls in der Lage sein muß, als Sender für den Fragecode zu dienen.A disadvantage of the known security device is primarily the three times transmission of a code signal, namely the previously sent code signal, the question code and the answer codes, which leads to transmission errors due to the high susceptibility to faults, particularly in motor vehicles. As a result, the rightful user of the motor vehicle is prevented from using it. In addition, there is a considerable amount of construction work, since the transmitter must be designed as a transponder. He must be able to receive the question code signal sent by the motor vehicle. The same applies to the receiver arranged on the motor vehicle, which must also be able to serve as a transmitter for the question code.

Der Erfindung liegt die aufgabe zugrunde, eine Sicherheitseinrich­tung der eingangs genannten Art zu schaffen, die mit geringem konstruktiven Aufwand ein Höchstmaß an Sicherheit hinsichtlich der Funktion bietet.The invention is based on the object of creating a safety device of the type mentioned at the outset, which offers the greatest possible degree of safety with regard to its function with little design effort.

Die Erfindung löst diese Aufgabe dadurch, daß das ausgesandte Codesignal in reproduzierbarer Weise entsprechend einem individuel­len Bildungsgesetz veränderlich ist, daß die Vergleichseinrichtung dieses Codesignals mit einer Anzahl von Codesignalen vergleicht, die sich aufgrund des Bildungsgesetzes an das erwartete Codesignal anschließen, daß bei fehlender Übereinstimmung des ausgesandten Codesignals mit einem der Codesignale aus der Anzahl von Codesigna­len die Vergleichseinrichtung ein weiteres, willkürlich vom Sender abgegebenes Codesignal mit dem Codesignal vergleicht, das sich an das zuerst ausgesandte Codesignal aufgrund des Bildungsgesetzes anschließt.The invention solves this problem in that the emitted code signal is reproducibly variable in accordance with an individual law of education, that the comparison device compares this code signal with a number of code signals which follow the expected code signal based on the law of education that if the emitted does not match Code signal with one of the code signals from the number of code signals, the comparison device compares a further code signal which is arbitrarily emitted by the transmitter with the code signal which follows the code signal first transmitted on the basis of the Education Act.

Grundlegend für die Erfindung ist zum einen die reproduzierbare Änderung des Codesignals im Sender. Im Empfänger steht für den ersten Vergleich ein "Fangbereich" mit der ersten Anzahl von Codesignalen zur Verfügung, der relativ groß bemessen ist. Dies hat seine Ursache darin, daß es möglich ist, das Codesignal des Senders willkürlich, beispielsweise mit Hilfe einer dort angeordne­ten Drucktaste, auch dann zu ändern, wenn der Sender nicht zum Auslösen des Schaltsignals der Sicherheitseinrichtung benutzt wird.The reproducible change in the code signal in the transmitter is fundamental to the invention. For the first comparison, a "catch area" with the first number of code signals is available in the receiver, which is relatively large. The reason for this is that it is possible to change the code signal of the transmitter arbitrarily, for example with the aid of a pushbutton arranged there, even when the transmitter is not used to trigger the switching signal of the safety device.

Kommt es nun vor, daß der "Fangbereich" durch willkürliche Veränderung des Codesignals im Sender verlassen wird, so führt das dann auf den Empfänger gerichtete Codesignal des Senders nicht zu einem positiven Ergebnis beim Vergleich des empfangenen Codesignals mit der ersten Anzahl von zum Vergleich herangezogenen Codesignals des Empfängers. Um nun in diesem Fall für den autorisierten Benutzer des Kraftfahrzeugs dennoch die Möglichkeit zu eröffnen, das Schaltsignal auszulösen, kann nun für einen zweiten Vergleich ein einziges Codesignal herangezogen werden, das sich aus dem zuerst empfangenen ersten Codesignal aufgrund des Bildungsgesetzes ergibt. Der unbefugte Benutzer kann, sofern er nicht in Besitz des Bildungsgesetzes ist, nicht das dann vom Empfänger erwartete Codesignal erzeugen. Auch der zweite Vergleich führt dann nicht zum Auslösen des Schaltsignals.If it happens that the "capture range" is left by arbitrary change of the code signal in the transmitter, then the code signal of the transmitter directed at the receiver does not lead to a positive result when the received code signal is compared with the first number of code signals used for comparison Recipient. In order to enable the authorized user of the motor vehicle to trigger the switching signal in this case, a single code signal can be used for a second comparison, which results from the first received code signal based on the Education Act. Unauthorized users, unless they are in possession of the Education Act, cannot generate the code signal expected by the recipient. The second comparison also does not lead to the triggering of the switching signal.

Eine vorteilhafte Verbesserung der Erfindung besteht darin, für den zweiten Vergleich das zweite Codesignal des Senders mit einer zweiten Anzahl von Codesignalen des Empfängers zu vergleichen. Diese Anzahl soll wesentlich kleiner sein als die Anzahl von Code­signalen für den ersten Vergleich. Maßgeblich hierfür ist die Überlegung, daß der "Fangbereich", d.h. die Anzahl der für den zweiten Vergleich herangezogenen Codesignale für den autorisierten Fahrzeugbenutzer relativ klein gehalten werden kann, da er das zweite Codesignal nach wirkungslosem Aussenden des ersten Codesi­gnals relativ schnell aussendet. Aufgrund des im Sender und Empfänger identischen Bildungsgesetzes der Codesignale "weiß" der Empfänger, welches Codesignal aufgrund des zuerst empfangenen Codesignals vom Sender als zweites Codesignal ausgesandt wird.An advantageous improvement of the invention consists in comparing the second code signal of the transmitter with a second number of code signals of the receiver for the second comparison. This number should be significantly smaller than the number of code signals for the first comparison. The decisive factor here is the consideration that the "catch area", i.e. the number of code signals used for the second comparison can be kept relatively small for the authorized vehicle user, since he sends the second code signal relatively quickly after the first code signal has been ineffectively transmitted. On the basis of the law of formation of the code signals which is identical in the transmitter and receiver, the receiver "knows" which code signal is to be transmitted by the transmitter as a second code signal on the basis of the code signal received first.

Führt auch der zweite Vergleich nicht zum Auslösen des Schaltsi­gnals, so kann dann ein Warn- oder Alarmsignal erzeugt werden, das auf eine einen offensichtlich mißbräuchlichen Versuch hinweist, die Sicherheitseinrichtung zu betätigen. Gleichzeitig kann durch eine entsprechende Verriegelung ein erneuter Vergleich zwischen einem ausgesandten Codesignal und einem Codesignal aus der in der beschriebenen Weise bestimmten Anzahl von Codesignalen für eine vorgegebene Zeit unterbunden werden.If the second comparison also does not lead to the triggering of the switching signal, then a warning or alarm signal can then be generated which indicates an obviously abusive attempt to operate the safety device. At the same time, a corresponding interlock can be used to make a new comparison between a transmitted code signal and a code signal from the determined number of code signals for a predetermined time prevented.

Ein erneuter Vergleich zwischen einem ausgesandten Codesignal und der Anzahl von Codesignalen kann, ggf. nach Ablauf einer vorgesehenen Sperrzeit, auf der Basis des ursprünglich von der Vergleichseinrichtung erwarteten Codesignals erfolgen. Der autori­sierte Benutzer des Kraftfahrzeugs kann bereits beim erstmaligen Aussenden des Codesignals die Sicherheitseinrichtung betätigen.A renewed comparison between a transmitted code signal and the number of code signals can be carried out, if necessary after a specified blocking time has elapsed, on the basis of the code signal originally expected by the comparison device. The authorized user of the motor vehicle can already actuate the security device when the code signal is first transmitted.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung darge­stellt.In the drawing, an embodiment of the invention is shown.

Ein schematisch gezeigtes Kraftfahrzeug 1 verfügt über einen Empfänger 2 für ein Codesignal, das von einem tragbaren Sender 3 geliefert wird. Die Übertragung des Codesignals erfolgt beispiels­weise auf Infrarot- bzw. Hochfrequenz-Basis. Mit dem Empfänger 2 verbunden ist ein Vergleicher 4, der seinerseits an einem Code­signal-Speicher 5 oder alternativ an einem Codesignal-Rechner angeschlossen ist. Der Vergleicher 4 steuert im Rahmen einer Sicherheitseinrichtung beispielsweise eine nicht im einzelnen ge­zeigte Eintriegelungsvorrichtung 6 eines ebenfalls nicht gezeigten Schlosses und ergänzend ggf. eine in der Regel akustische Warnan­zeige.A schematically shown motor vehicle 1 has a receiver 2 for a code signal, which is supplied by a portable transmitter 3. The code signal is transmitted, for example, on an infrared or radio frequency basis. A comparator 4 is connected to the receiver 2, which in turn is connected to a code signal memory 5 or alternatively to a code signal computer. In the context of a safety device, the comparator 4 controls, for example, a locking device 6, not shown in detail, of a lock, also not shown, and additionally, if necessary, a generally acoustic warning display.

Die vom Sender 3 gelieferten und im Speicher 5 enthaltenen Code­signale unterliegen demselben z.B. hinsichtlich des Impuls-/Pausen-­Verhältnisses individuellen Bildungsgesetz. Jedes Codesignal steht mit dem vorangegangen und dem darauffolgenden in einem definierten Bezug. Dieser kann beispielsweise durch eine fortlaufende Nummer gegeben sein. Sofern Sender 3 und Empfänger 2 synchronisiert sind, ist das am Empfänger 2 empfangene Codesignal identisch mit dem Codesignal, das im Speicher 5 enthalten ist und das für diesen Sende-/Empfangsvorgang erwartet wird. Der Vergleicher 4 stellt die Übereinstimmung der beiden Codesignal fest und gibt ein entsprechendes Schaltsignal an die Entriegelungsvorrichtung 6 ab.The code signals supplied by the transmitter 3 and contained in the memory 5 are subject to the same individual education law, for example with regard to the pulse / pause ratio. Each code signal is in a defined relationship with the preceding and the following one. This can be given, for example, by a consecutive number. Provided that transmitter 3 and receiver 2 are synchronized are, the code signal received at the receiver 2 is identical to the code signal which is contained in the memory 5 and which is expected for this transmission / reception process. The comparator 4 determines the correspondence of the two code signals and outputs a corresponding switching signal to the unlocking device 6.

Das Codesignal des Senders 3, das in bekannter Weise mit Hilfe eines Schalters 7 willkürlich auslösbar ist, kann mit jedem Betäti­gen des Schalters 7 verändert werden. Die Veränderung des Codesignals geschieht mit Hilfe des vorgegebenen Bildungsgesetz­es.The code signal of the transmitter 3, which can be triggered arbitrarily in a known manner with the aid of a switch 7, can be changed each time the switch 7 is actuated. The code signal is changed using the specified education law.

Es kann nun vorkommen, daß das Codesignal des Senders 3 durch entsprechendes mehrmaliges Betätigen des Schalters 7 verändert wird und die jeweils ausgesandten Codesignale nicht auf den Empfänger 2 gelangen. In diesem Fall tritt eine Asynchronität zwischen Sender 3 und Empfänger 2 auf. Um in einen derartigen Fall sicherzustellen, daß der Vergleicher 4 auch in diesem Fall ein entsprechendes Schaltsignal für die Entriegelungsvorrichtung 6 liefert, ist innerhalb des Speichers 5 zu jedem eigentlich erwarte­ten Codesignal eine Anzahl (1) von Codesignalen vorhanden, die sich an das erwartete Codesignal anschließen und die aufgrund des Bildungsgesetzes bestimmt sind. Die Anzahl dieser Codesignale ist vorgegeben und beträgt beispielsweise 20. Wird das Codesignal des Senders 3 durch bis zu 20maliges Betätigen des Schalters 7 verän­dert und eines dieser Codesignale auf den Empfänger 2 gerichtet, so stellt der Vergleicher 4 die Übereinstimmung des empfangenen Codesignals mit einem der gespeicherten 20 Codesignale fest und liefert ein entsprechendes Schaltsignal an die Entriegelungsvorrich­tung 6.It can now happen that the code signal of the transmitter 3 is changed by correspondingly actuating the switch 7 a number of times and that the code signals respectively sent do not reach the receiver 2. In this case, asynchrony occurs between transmitter 3 and receiver 2. In order to ensure in such a case that the comparator 4 also delivers a corresponding switching signal for the unlocking device 6 in this case, a number (1) of code signals is present in the memory 5 for each code signal actually expected, which code signals follow the expected code signal and which are determined by the Education Act. The number of these code signals is predetermined and is, for example, 20. If the code signal of the transmitter 3 is changed by actuating the switch 7 up to 20 times and one of these code signals is directed at the receiver 2, the comparator 4 compares the received code signal with one of the stored ones 20 code signals and delivers a corresponding switching signal to the unlocking device 6.

Wird das Codesignal des Senders 3 durch mehr als 20maliges Betätigen des Schalters 7 verändert, so stellt der Vergleicher 4 die fehlende Übereinstimmung des dann vom Sender 3 ausgesandten und mit dem Empfänger 2 empfangenen Codesignal und den gespeicher­ten 20 Codesignalen fest und liefert das Schaltsignal an die Ent­riegelungsvorrichtung 6 nicht.If the code signal of the transmitter 3 is changed by actuating the switch 7 more than 20 times, the comparator 4 determines the mismatch between the code signal then transmitted by the transmitter 3 and received with the receiver 2 and the stored 20 code signals and delivers the switching signal to the unlocking device 6 not.

Um in diesem Fall dem autorisierten Fahrzeugbenutzer die Möglich­keit zu geben, das Fahrzeug dennoch zu benutzen, wird ein innerhalb einer relativ kurzen Zeitspanne vom Sender 3 ausgesand­tes zweites und entsprechend dem Bildungsgesetz gegenüber dem ersten ausgesandten Codesignal verändertes Codesignal im Verglei­cher 4 mit einem Codesignal verglichen, das im Speicher 5 in einer Anzahl (11) von Codesignalen enthalten ist. Diese zweite Anzahl von Codesignalen ist wesentlich kleiner als die erste, für den ersten Vergleich berücksichtigte Anzahl (1) von Codesignalen. Die Codesignale der zweiten Anzahl ergeben sich auf der Basis des mit dem Empfänger aufgenommenen ersten Codesignals des Senders 3 aufgrund des weiterhin gültigen Bildungsgesetzes. Diese zweite Anzahl ist beispielsweise gleich 3. Die Prüfung des zweiten Codesi­gnals des Senders 3 mit den Codesignalen der zweiten Anzahl des Speichers 5 wird mit Hilfe eines Zeitglieds 8 ermöglicht, das in die Verbindung zwischen dem Speicher 5 und dem Vergleicher 4 eingeschal­tet ist. Das Zeitglied 8 wird vom Vergleicher 4 bei Durchführung des ersten Vergleichs aktiviert.In order to give the authorized vehicle user the possibility to use the vehicle in this case, a second code signal sent out by the transmitter 3 within a relatively short period of time and modified in accordance with the law on education compared to the first code signal sent is compared in the comparator 4 with a code signal that is contained in the memory 5 in a number (11) of code signals. This second number of code signals is significantly smaller than the first number (1) of code signals taken into account for the first comparison. The code signals of the second number result on the basis of the first code signal of the transmitter 3 recorded with the receiver on the basis of the still valid education law. This second number is, for example, equal to 3. The test of the second code signal of the transmitter 3 with the code signals of the second number of the memory 5 is made possible with the aid of a timing element 8 which is connected to the connection between the memory 5 and the comparator 4. The timing element 8 is activated by the comparator 4 when the first comparison is carried out.

Durch die Verwendung einer zweiten Anzahl von Codesignalen für einen zweiten Vergleich zwischen dieser Anzahl und dem zweiten vom Sender 3 ausgesandten Codesignal wird es möglich, den Fahrzeug­benutzer auch nach ergebnislosem Aussenden eines ersten Codesignals in die Lage zu versetzen, das Kraftfahrzeug zu benutzen. Er hat hierzu lediglich innerhalb der vorgegebenen und durch das Zeitglied 8 bestimmten Zeit ein zweites Codesignal auszusenden. Die für den Vergleich bereitgestellten Codesignale ergeben sich aus dem ersten empfangenen Codesignal aufgrund des Bildungsgesetzes. Die kleine Anzahl der Codesignale für den zweiten Vergleich ergibt sich aus der Überlegung, daß das zweite ausgesandte Codesignal in der Regel identisch ist mit dem Codesignal, das auf das erste empfange­ne Codesignal aufgrund des Bildungsgesetzes unmittelbar folgt. Die Hinzunahmen zweier weiterer folgender Codesignale dient lediglich dazu, dem Fahrzeugbenutzer maximal zwei "Zuviel-"Betätigungen des Schalters 7 zu ermöglichen.By using a second number of code signals for a second comparison between this number and the second code signal emitted by the transmitter 3, it is possible to enable the vehicle user to use the motor vehicle even after an unsuccessful transmission of a first code signal. For this purpose, it only has to send out a second code signal within the predetermined time determined by the timer 8. The code signals provided for the comparison result from the first code signal received on the basis of the Education Act. The small number of code signals for the second comparison results from the consideration that the second code signal transmitted is usually identical to the code signal which immediately follows the first received code signal due to the Education Act. The addition of two further code signals below only serves to allow the vehicle user a maximum of two "too many" operations of the switch 7.

Ein nicht befugter Farhzeugbenutzer ist nicht in der Lage, das Kraftfahrzeug zu benutzen. Zum einen findet sich ein von ihm ausgesandtes erstes Codesignal nicht in der Anzahl 1 für einen ersten Vergleich, da grundsätzlich Asynchronität zwischen dem Sender eines nicht autorisierten Fahrzeugbenutzers und dem ge­speicherten Codesignal besteht und da ggf. der Aufbau der Codesi­gnale und ferner das Bildungsgesetz für die Bestimmung der Codesignale für jedes Kraftfahrzeug unterschiedlich ist. Selbst wenn das von einem nicht autorisierten Dritten ausgesandte Codesi­gnal im Speicher 5 enthalten wäre, und die Basis für den Vergleich eines zweiten Codesignals damit bestimmt wäre, so würde der Vergleich des zweiten Codesignals mit dem dafür im Speicher 5 vorgesehenen Codesignal nicht zum "Erfolg" führen, da das zweite Codesignal nur mit einem bzw. wenigen, durch das Bildungsgesetz definierten Codesignalen verglichen wird.An unauthorized vehicle user is unable to use the motor vehicle. On the one hand, a first code signal sent by him cannot be found in the number 1 for a first comparison, since there is basically asynchrony between the transmitter of an unauthorized vehicle user and the stored code signal, and because the structure of the code signals and also the education law for the determination may exist the code signals are different for each motor vehicle. Even if the code signal sent by an unauthorized third party were contained in the memory 5 and the basis for the comparison of a second code signal was thus determined, the comparison of the second code signal with the code signal provided for this purpose in the memory 5 would not lead to "success" , since the second code signal is only compared with one or a few code signals defined by the Education Act.

Anstelle des Codesignal-Speichers 5 kann auch ein Codesignal-Rech-­ner dienen, der die erste und zweite Anzahl von für den Vergleich berücksichtigten Codesignalen auf der Basis des zuletzt maßgebli­chen bzw. des ersten ausgesandten Codesignals erstellt.Instead of the code signal memory 5, it is also possible to use a code signal calculator which generates the first and second number of code signals taken into account for the comparison on the basis of the code code which was decisive last or the first code signal emitted.

Claims (5)

1. Sicherheitseinrichtung für ein Kraftfahrzeug, insbesondere zur Zugangskontrolle oder als Diebstahlschutz, mit einem tragbaren Sender für ein willkürlich abzugebendes, bei der Abgabe gegenüber dem vorangegangenen Codesignal verändertes Codesignal und mit einem am Kraftfahrzeug angeordneten Empfänger für dieses Codesignal, dem eine Vergleichseinrich­tung für das tatsächlich ausgesandte und das erwartete Codesignal zugeordnet ist und die bei Übereinstimmung der beiden Codesignale ein Schaltsignal abgibt, dadurch gekenn­zeichnet, daß das ausgesandte Codesignal in reproduzierbarer Weise entsprechend einem individuellen Bildungsgesetz veränder­lich ist, daß die Vergleichseinrichtung (4) dieses Codesignal mit einer Anzahl (1) von Codesignalen vergleicht, die sich aufgrund des Bildungsgesetzes an das erwartete Codesignal anschließen, und daß bei fehlender Übereinstimmung des ausgesandten Codesignals mit einem der Codesignale aus der Anzahl von Codesignalen die Vergleichseinrichtung (4) ein weiteres, willkürlich vom Sender (3) abgegebenes Codesignal mit dem Codesignal vergleicht, das sich an das zuerst ausge­sandte Codesignal aufgrund des Bildungsgesetzes anschließt.1.Security device for a motor vehicle, in particular for access control or as theft protection, with a portable transmitter for an arbitrarily emitted code signal that is changed when it is released compared to the previous code signal and with a receiver arranged on the motor vehicle for this code signal, which a comparison device for the one actually emitted and the expected code signal is assigned and which emits a switching signal if the two code signals match, characterized in that the code signal emitted is reproducibly variable in accordance with an individual law of education that the comparison device (4) this code signal with a number (1) of code signals compares that follow the expected code signal based on the Education Act and that if the code signal sent does not match one of the code signals from the number of code signals, the comparison device (4) compares another code signal, which is emitted arbitrarily by the transmitter (3), with the code signal which follows the code signal first transmitted on the basis of the Education Act. 2. Sicherheitseinrichtung nach Anspruch 1, dadurch gekennzeich­net, daß die Vergleichseinrichtung das weitere, willkürlich vom Sender abgegebene Codesignal mit einer zweiten, gegen­ über der ersten Anzahl wesentlich kleineren zweiten Anzahl (11) von Codesignalen vergleicht, die sich an das zuerst ausgesandte Codesignal aufgrund des Bildungsgesetzes an­schließen.2. Security device according to claim 1, characterized in that the comparison device, the further, arbitrarily given by the transmitter code signal with a second, against compares the first number of substantially smaller second numbers (11) of code signals which follow the code signal transmitted first on the basis of the Education Act. 3. Sicherheitseinrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß eine Warneinrichtung (9) bei fehlender Übereinstimmung der Codesignale beim ersten und zweiten Vergleich ein Warn- oder Alarmsignal abgibt.3. Safety device according to one of claims 1 or 2, characterized in that a warning device (9) emits a warning or alarm signal if the code signals do not match in the first and second comparison. 4. Sicherheitseinrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß ein Zeitglied (8) die Vergleichs­einrichtung (4) nach Empfang des ersten Codesignals des Senders (3) nur eine kurze Zeitdauer nach diesem Empfang aktiviert und für eine daran anschließende längere Zeitdauer sperrt.4. Safety device according to one of claims 1 to 3, characterized in that a timer (8), the comparison device (4) after receiving the first code signal of the transmitter (3) activated only a short period after this reception and for a subsequent longer period locks. 5. Sicherheitseinrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Vergleichseinrichtung (4) bei fehlender Übereinstimmung der Codesignale beim ersten und zweiten Vergleich das ursprünglich erwartete Codesignal als Ausgangspunkt beibehält.5. Security device according to one of claims 1 to 4, characterized in that the comparison device (4) maintains the originally expected code signal as a starting point if the code signals do not match in the first and second comparison.
EP19860113981 1985-10-11 1986-10-09 Security device for an automotive vehicle Expired - Lifetime EP0219060B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853536378 DE3536378A1 (en) 1985-10-11 1985-10-11 SAFETY DEVICE FOR A MOTOR VEHICLE
DE3536378 1985-10-11

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EP0219060A2 true EP0219060A2 (en) 1987-04-22
EP0219060A3 EP0219060A3 (en) 1988-08-24
EP0219060B1 EP0219060B1 (en) 1992-06-03

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EP0265728A2 (en) * 1986-10-29 1988-05-04 Wilhelm Ruf KG Electronic remote control device for the central locking systems of motor vehicles
GB2219676A (en) * 1988-06-10 1989-12-13 Omni Services Limited A locking control system for preventing unauthorized entry into a secure area
EP0257376B1 (en) * 1986-08-12 1991-11-06 Siemens Aktiengesellschaft Electronic locking system comprising at least a lock, particularly for motor cars
FR2685525A1 (en) * 1991-10-18 1993-06-25 Trw Sipea Spa REMOTE CONTROL FOR MANUFACTURING, PARTICULARLY FOR A MOTOR VEHICLE.
WO1996007994A1 (en) * 1994-09-09 1996-03-14 Banksys Method and arrangement for providing selective access to a security system
WO1997030424A1 (en) * 1996-02-15 1997-08-21 Misko, Patrick Method for server-authorised service access from portable electronic microcircuit devices such as smart cards
US6617961B1 (en) 1999-11-15 2003-09-09 Strattec Security Corporation Security system for a vehicle and method of operating same

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DE9419635U1 (en) * 1994-12-09 1995-03-02 Engel, Gerhard, Dipl.-Ing., 41564 Kaarst Safety device, in particular for motor vehicles
US5774858A (en) * 1995-10-23 1998-06-30 Taubkin; Vladimir L. Speech analysis method of protecting a vehicle from unauthorized accessing and controlling

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0257376B1 (en) * 1986-08-12 1991-11-06 Siemens Aktiengesellschaft Electronic locking system comprising at least a lock, particularly for motor cars
EP0265728A2 (en) * 1986-10-29 1988-05-04 Wilhelm Ruf KG Electronic remote control device for the central locking systems of motor vehicles
EP0265728A3 (en) * 1986-10-29 1989-02-01 Wilhelm Ruf KG Electronic remote control device for the central locking systems of motor vehicles
GB2219676A (en) * 1988-06-10 1989-12-13 Omni Services Limited A locking control system for preventing unauthorized entry into a secure area
FR2685525A1 (en) * 1991-10-18 1993-06-25 Trw Sipea Spa REMOTE CONTROL FOR MANUFACTURING, PARTICULARLY FOR A MOTOR VEHICLE.
WO1996007994A1 (en) * 1994-09-09 1996-03-14 Banksys Method and arrangement for providing selective access to a security system
BE1008699A3 (en) * 1994-09-09 1996-07-02 Banksys Method and arrangement for selective give access to a security system.
WO1997030424A1 (en) * 1996-02-15 1997-08-21 Misko, Patrick Method for server-authorised service access from portable electronic microcircuit devices such as smart cards
FR2745135A1 (en) * 1996-02-15 1997-08-22 Cedric Colnot METHOD FOR AUTHORIZING ACCESS BY A SERVER TO A SERVICE FROM PORTABLE MEMORY CARD TYPE ELECTRONIC MICROCIRCUIT DEVICES
US6393567B1 (en) 1996-02-15 2002-05-21 Elva Sa Method of enabling a server to authorize access to a service from portable devices having electronic microcircuits, e.g. devices of the smart card type
US6617961B1 (en) 1999-11-15 2003-09-09 Strattec Security Corporation Security system for a vehicle and method of operating same

Also Published As

Publication number Publication date
DE3685541D1 (en) 1992-07-09
EP0219060A3 (en) 1988-08-24
DE3536378A1 (en) 1987-04-16
EP0219060B1 (en) 1992-06-03

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