EP0402442A1 - Systeme de verrouillage et procede correspondant - Google Patents

Systeme de verrouillage et procede correspondant

Info

Publication number
EP0402442A1
EP0402442A1 EP19900900761 EP90900761A EP0402442A1 EP 0402442 A1 EP0402442 A1 EP 0402442A1 EP 19900900761 EP19900900761 EP 19900900761 EP 90900761 A EP90900761 A EP 90900761A EP 0402442 A1 EP0402442 A1 EP 0402442A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
measured values
housing
stored
rotation
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Withdrawn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
EP19900900761
Other languages
German (de)
English (en)
Inventor
Hans Kolb
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.)
F & G Megamos Sicherheitselektronik GmbH
Original Assignee
F & G Megamos Sicherheitselektronik GmbH
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 F & G Megamos Sicherheitselektronik GmbH filed Critical F & G Megamos Sicherheitselektronik GmbH
Publication of EP0402442A1 publication Critical patent/EP0402442A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B49/00—Electric permutation locks; Circuits therefor ; Mechanical aspects of electronic locks; Mechanical keys therefor
    • E05B49/002—Keys with mechanical characteristics, e.g. notches, perforations, opaque marks

Definitions

  • the invention relates to a method for actuating a locking system, in particular a central locking system of a motor vehicle with a lock consisting of a housing with a cylinder which can preferably be rotated therein with a flat key, with generating measured values when the cylinder rotates, with storage of the during a first rotation Measured values generated by the cylinder, comparing these stored measured values with the measured values generated when the cylinder is rotated again and generating a control signal when the equality or approximate equality between the stored values and the measured values arising during the renewed rotation is determined.
  • the invention further relates to a device for performing this method with a lock with a housing and a cylinder rotatable therein, with a rotating with the cylinder and an electrical, magnetic or optical .
  • Measured value generating device with at least one sensor on the housing for detecting the measured value, with a memory and with a control device.
  • a control for the central locking of a motor vehicle is known (DE-OS 3 426 508).
  • the key and the cylinder of the cylinder lock of this central locking system have the usual mechanical tumblers.
  • the key contains magnetically, electrically or optically readable information.
  • the lock can be opened by turning the key further.
  • the information read is also stored in a memory as new target information.
  • This control is intended to make it difficult for an unauthorized person to actuate the central locking. Only if the key used by the unauthorized person has the correctly shaped beard for actuating the tumblers and the correct one If the key contains additional information, the key can be used.
  • This method uses a transmitter and a receiver.
  • the receiver contains a comparison circuit which emits a control signal if the received coding matches a stored code.
  • the receiver also contains a circuit that learns the coding emitted by the transmitter.
  • central locking systems were increasingly installed in the vehicles. These central locking systems - with servo assistance - lock all other existing locks when one of the locks on the vehicle is locked. All common central locking systems are activated by electrical signals. An electrical signal is derived from the mechanical lock, which gives the command for central locking to the mechanism provided.
  • the mechanical lock on vehicles is a very precise mechanical part.
  • the electrical signal required for the closing or opening process is generated by means of a mechanical microswitch. This is attached to the lock. When the cylinder is turned into its end position, it makes contact. This microscale - ⁇ ter must meet the highest precision requirements, since it must be attached to the cylinder of the lock, it is very strongly exposed to moisture and corrosion.
  • This microswitch represents the in modern locking systems Weak point of the entire system. If a thief manages to operate the microswitch directly past the lock with a thin, wire-like object, he can use this manipulation to open the vehicle without a key. This means that any type of mechanical switch for coupling the mechanical lock with the electronics of the central locking system is very poorly suited.
  • the invention is based on the object of coupling the lock and electronics without a mechanical connection in such a way that even an intelligent thief cannot outsmart the coupling and is not able to generate the control signal from the outside by any mechanical manipulation.
  • the solution to this problem results according to the invention in a method of the type mentioned at the outset by detecting and storing measured values generated on the housing at two separate locations during the first rotation, which are generated when the rotation is repeated. Measured values are also detected and compared with the stored ones, and the control signal is generated in the case of equality or approximation.
  • the measured values are magnetic, electrical or optical quantities. To simplify the description, the invention is explained below using the example of a magnetic measured value.
  • a magnetic field is generated by one or more permanent magnets, which, due to the geometry of the cylinder and the various metallic materials used therein, can have a very complicated structure. If one measures the magnetic flux density with two corresponding sensors at two different locations on the housing, functions of the magnetic flux densities, which are correlated to one another, result when the key is rotated as a function of the angle of rotation. When the key is rotated properly is always the instantaneous value of the magnetic flux density measured at one point combined with another value of this flux density at the other point The flux densities occurring in both positions have a very specific size in each rotational position of the cylinder.
  • the control signal is only generated if the quantities of the flux densities detected at these points when the cylinder is rotated again match the stored ones.
  • the shape of the metallic key also affects the size of the flux densities measured at these points.
  • the rotating cylinder and the stationary housing of the lock are expediently designed geometrically and the measuring points are arranged in such a way that the magnetic flux density increases when the cylinder rotates at one measuring point and decreases at the other measuring point.
  • the two measured values are expediently detected, stored and compared in accordance with the rotational position of the cylinder in the housing or in terms of their time.
  • the two measured values can only be stored and / or compared with one another at a few points in their chronological course. This makes it possible to compromise between the accuracy with which the new measured values are compared with the stored ones and the capacity of the used memories.
  • a very high accuracy with low capacity of the memory results in a further embodiment, which is • characterized in that the temporal course of the two measured values is normalized during the first rotation, a correlation function is formed and stored and in one If the rotation is repeated again, the time course of the two measured values is normalized, a correlation function is formed and the two correlation functions are compared with one another. For each lock, the flux density values measured at the two points are in a specific relationship to one another. This presents itself as a correlation function. Only this is stored and also used for comparison when it is rotated again. All measured values are expediently digitized and stored in digitized form.
  • the device used to carry out the method according to the invention differs from the prior art in that two sensors are arranged at two points apart in the housing of the lock.
  • the sensors should lie on an arc in accordance with the rotation of the cylinder.
  • Guide plates which conduct the magnetic flux differently, are expediently located between the two sensors and the cylinder.
  • the guide plates can have different magnetic resistance and / or can be shaped differently. This can achieve the goal already explained, that the magnetic flux at a maximum at one sensor at the other sensor reaches a minimum.
  • at least one permanent magnet should be arranged on the cylinder.
  • at least one magnetic coil can also be arranged.
  • a magnetic coil can also be arranged on the cylinder and a coil coupled to the housing as a detector.
  • one plate pack of a rotary condenser can also be arranged on the cylinder and the other on the housing.
  • the control signal is not triggered by any mechanical manipulation.
  • the invention provides in a further embodiment that two sensors are arranged in the housing at two points apart. Unless turns in this embodiment -a "thief the cylinder by force in ⁇ ff- • voltage direction, breaking the breaking point. This ent falls, the magnetic coupling. The control signal is not triggered.
  • the electronics learn the correlation between measured values at the two sensor locations as a function of the rotation during the first closing operation. angle of the key. This is done in such a way that a correlation function is derived from the measurement signals determined when opening or closing the first time and this is stored permanently.
  • the electronics then immediately know which pairs of values of the measured quantity, for example the magnetic flux density, must occur.
  • the two functions of the measured variable are determined, a correlation function is formed from this and compared with the known target curve, which is accessible in the electronics memory. Only when there is agreement does the electronics of the central locking system be released and opened via a coded signal with corresponding feedback.
  • the downstream electronics In order to enable a locking or opening process at any time, the downstream electronics must be constantly ready, the two measured value functions when the key is turned read in, compare and then forward the corresponding signal sequence to the central locking electronics. This would lead to very high power consumption. Therefore, the aim is to decouple a circuit part whose task is to detect an opening process as early as possible, that is to say when the key in the lock begins to be turned, and then to immediately activate the downstream electronics for recording and comparing the recorded measured values - four.
  • This circuit part would have to be implemented in very high-resistance circuit technology. Its power consumption would be very low.
  • Such circuits are known. They are used, for example, in alarm systems in motor vehicles. There are also examples of remote-controlled television sets. In the "ready for operation" condition, they require very little electricity.
  • the method according to the invention is self-adjusting.
  • the locking system When the locking system is actuated for the first time, its measured value functions are read in and stored in accordance with the existing circumstances. All tolerances of each castle including "its components are so Stiem from SY * already considered and need not be separated yaws korri ⁇ .
  • an abundance of other measured variables can be used to monitor a closing or opening process according to the principle given above.
  • the prerequisite is that the measured variable in the rotating cylinder or in the fixed stationary cylinder housing is detected, a clear electrical signal can be derived.
  • effects can be used which can be manipulated in such a way that a measured value which is clearly variable via the angle of rotation of the key is obtained and which can be converted into an electrical signal in such a way that a characteristic property of this electrical signal, for example its amplitude, frequency or phase depends on the angle of rotation.
  • a sensor for this purpose, it is also possible to separately attach a sensor to the lock so that a measurement function with the properties described above can be obtained.
  • Examples of this are the arrangement of two plunger coils, the detection of their inductance, the plunger coils should be divided into two, the arrangement of a butterfly capacitor and the detection of its capacitance.
  • Sensor is understood here to mean both the part producing the measured variable and the part of a circuit or arrangement which receives the measured value. Under no circumstances, however, should the sensor arrangement be designed in a self-contained housing or partial housing, which as a whole can be separated from the lock. After removing the lock, this sensor would then be freely accessible. accessible and would provide the correct measurement signals if rotated accordingly.
  • the sensors should also be designed in such a way that they deliver measurement signals which also depend on the mechanical tolerances of the individual lock specimen. This further complicates the simulation of the measured value curve required for opening.
  • the invention was explained using the example of the lock of a motor vehicle.
  • the following exemplary embodiment also relates to a motor vehicle lock.
  • the invention can be applied far more generally. It can be used wherever a rotation is to trigger an electrical control signal and the contact previously usually used is to be arranged in such a way that it cannot be reached with the key or with any other mechanical element and can thus be manipulated and closed.
  • Fig. 'L is a simplified schematic representation of a Erfin dung designed according Zylinder ⁇ chlosses
  • Fig. 2 shows the course of the flux density at the two sensors when turning the cylinder
  • FIG. 3 is a -schematician "representation of a particular excluded * staltung the cylinder.
  • Fig. 1 shows a cylinder lock having a cylinder housing 12, which is arranged in this rotatable cylinder 14 with a Wegsteck ⁇ th key 16, two attached to the end face of the cylinder 14 the permanent magnet 18 and two in the cylinder housing 12 sensors' 20 relative to the rotational axis of the cylinder 14, the two permanent magnets 18 are offset from one another by 180 °.
  • the flux densities B that occur when the cylinder 14 is turned at the two sensors 20 or measuring points 1 and 2 are shown in FIG. 2 as a function of the angle of rotation.
  • the flux densities B and B are also offset from one another by approximately 180 °. At a rotation angle of zero the flux density B ⁇ reaches.
  • the two flux densities B .. and B are stored in a digitized form at a certain angle of rotation or over a range of angles of rotation. Likewise, a number which is derived from a mathematical relationship between the two flux densities can also be stored.
  • the electronics determine whether the then occurring flux densities B 1 and B_ match the stored value or the stored values.
  • control signal is triggered.
  • a predetermined breaking point 22 is provided in the cylinder 14. This lies at the inner end or at a distance from the handle of the key 16.
  • FIG. 3 also shows various tumblers 24.
  • the predetermined breaking point breaks.
  • the -of the * innenlie- .genden end cylinder 14 mounted permanent magnets 18 advertising * - - does not move to.
  • the flux density at the sensors 20 thus remains constant.
  • the control signal is not triggered.
  • the screwdriver is inserted, the magnetic conductivity of the cylinder is also changed. This means that the magnitudes of the magnetic fluxes generated when turning no longer match the stored magnitudes. This also means that the control signal is not triggered.

Landscapes

  • Lock And Its Accessories (AREA)

Abstract

Les voitures haut de gamme sont dotées d'un système de verrouillage central. Lorsque ce système est actionné, un contact mécanique produit un signal électrique qui est envoyé aux autres serrures. Or ce contact peut être manipulé, ce qui permet à des intrus d'actionner le système central de verrouillage. La présente invention consiste à doter le cylindre (14) de la serrure à pompe de deux aimants permanents (18) et à pourvoir le boîtier du cylindre (12) de deux détecteurs (20). Lorsque le cylindre tourne, les aimants permanents génèrent un champ magnétique rotatif qui est détecté puis analysé par les détecteurs. Si la situation est jugée normale, un signal de commande est généré. La serrure selon la présente invention ne peut pas être manipulée mécaniquement avec un fil de fer ou autre objet semblable, ni influencée à l'aide d'un champ magnétique.
EP19900900761 1988-12-22 1989-12-22 Systeme de verrouillage et procede correspondant Withdrawn EP0402442A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3843129 1988-12-22
DE3843129 1988-12-22
DE3901054 1989-01-16
DE3901054 1989-01-16

Publications (1)

Publication Number Publication Date
EP0402442A1 true EP0402442A1 (fr) 1990-12-19

Family

ID=25875439

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900900761 Withdrawn EP0402442A1 (fr) 1988-12-22 1989-12-22 Systeme de verrouillage et procede correspondant

Country Status (2)

Country Link
EP (1) EP0402442A1 (fr)
WO (1) WO1990007045A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2752005B1 (fr) * 1996-07-30 2004-11-26 Kiekert Ag Fermeture de portiere de vehicule automobile avec systeme de serrure et systeme de fermeture
GB2316436B (en) * 1996-08-24 2001-03-07 Kiekert Ag Motor vehicle door lock
DE29618688U1 (de) * 1996-10-26 1997-01-02 Kiekert AG, 42579 Heiligenhaus Einrichtung zum Abfragen von Schaltstellungen an einem Kraftfahrzeugtürverschluß
DE19646810C2 (de) * 1996-11-13 1999-02-04 Kiekert Ag Kraftfahrzeugtürverschluß mit Schloßsystem, Schließsystem und auf eine Auswerteelektronik arbeitender Einrichtung Abfrage der Funktionsstellungen des Schließzylinders, die mit Hallsensor-Chips arbeitet
US6067824A (en) * 1998-10-29 2000-05-30 Optek Technology, Inc. Automobile ignition security system using a differential magnetic comparator
DE19947483B4 (de) * 1999-10-01 2004-04-15 Brose Schließsysteme GmbH & Co.KG Kraftfahrzeug-Türschloss

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2112844B (en) * 1981-12-14 1985-04-17 John Hurley Moorhouse Coded solid state entry device
DE3333094A1 (de) * 1983-09-14 1985-03-28 Ymos-Metallwerke Wolf & Becker Gmbh & Co, 6053 Obertshausen Verfahren und vorrichtung zum oeffnen und schliessen von schloessern, insbesondere von kraftfahrzeugschloessern
DE3426508A1 (de) * 1984-07-18 1986-01-23 Sachs Systemtechnik Gmbh, 8720 Schweinfurt Schaltschlossanlage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9007045A1 *

Also Published As

Publication number Publication date
WO1990007045A1 (fr) 1990-06-28

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