WO1994002702A1 - Systeme de securite - Google Patents

Systeme de securite Download PDF

Info

Publication number
WO1994002702A1
WO1994002702A1 PCT/GB1993/001532 GB9301532W WO9402702A1 WO 1994002702 A1 WO1994002702 A1 WO 1994002702A1 GB 9301532 W GB9301532 W GB 9301532W WO 9402702 A1 WO9402702 A1 WO 9402702A1
Authority
WO
WIPO (PCT)
Prior art keywords
code
security system
function
lock
storage means
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.)
Ceased
Application number
PCT/GB1993/001532
Other languages
English (en)
Inventor
Tony Moon
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.)
A B AUTOMOTIVE ELECTRONICS Ltd
AB Automotive Electronics Ltd
Original Assignee
A B AUTOMOTIVE ELECTRONICS Ltd
AB Automotive Electronics Ltd
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 A B AUTOMOTIVE ELECTRONICS Ltd, AB Automotive Electronics Ltd filed Critical A B AUTOMOTIVE ELECTRONICS Ltd
Publication of WO1994002702A1 publication Critical patent/WO1994002702A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/20—Individual registration on entry or exit involving the use of a pass
    • G07C9/21—Individual registration on entry or exit involving the use of a pass having a variable access code
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/01—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens
    • B60R25/04—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on the propulsion system, e.g. engine or drive motor
    • B60R25/045—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on the propulsion system, e.g. engine or drive motor by limiting or cutting the electrical supply to the propulsion unit
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/20—Individual registration on entry or exit involving the use of a pass
    • G07C9/27—Individual registration on entry or exit involving the use of a pass with central registration

Definitions

  • the invention relates to a security system which may be applied generally to any security installation in which a lock or a sensor is operated electrically or connected electrically to other equipment, and in particular, but without prejudice to the generality of the invention, may be applied to a security system installed in a motor vehicle.
  • motor vehicle encompasses any form of vehicle driven by a motor, and includes watercraft and aircraft.
  • motor will be understood to include any form of power unit for propulsion of a vehicle and in particular includes internal combustion engines and electric motors.
  • Known security systems which are suitable for motor vehicles generally comprise audible and/or visible alarms which, when armed, are triggered by unauthorised attempts to enter or start the vehicle.
  • Similar security systems are known for buildings where access to interior parts is restricted by electrically operated locks, often provided with a magnetic card as the key, or where access through doors or windows is protected by sensors for detecting attempts at unauthorised entry.
  • Variously sophisticated systems have been devised in order to try and ensure that the security system is not circumvented by disconnecting or bypassing the sensors.
  • Such systems include continuity detectors and inductive loops. All of these have weaknesses and disadvantages, however, so that some attempts at unauthorised entry are still able to succeed.
  • the present invention seeks to provide a simple and economical means by which it is possible to prevent a remote sensor, such as a key-operated switch or a window or door sensor from being disconnected or bypassed, with the intention that even professional thieves may be deterred from trying to circumvent the security system.
  • a remote sensor such as a key-operated switch or a window or door sensor
  • a security system in which a lock or sensor is provided with code storage means electrically connected to remote function-enabling means which act to enable the operation of a function only upon receipt of a correct code " from the said code storage means, the system including means for generating a random or pseudo-random code upon the occurrence of a given event and for transmitting it to the said code storage means for storage therein, and the said remote function enabling means including means for storing the current code transmitted to the said code storage means, and means for interrogating the code storage means to verify the code stored therein before enabling the said function.
  • the said given event may be arming of the alarm system.
  • the code storage means is associated with a lock the said given event may be closure or locking of the lock.
  • vehicle lock which will be used hereinafter will be understood herein to refer to any locking mechanism with which a vehicle may be provided and specifically to include door and boot locks, steering lock, ignition lock or a special purpose lock provided for the function enabling unit, where the function may be motor-operation interdiction. In this case "enabling" the function will mean lifting the interdiction.
  • the interdiction of motor operation may be introduced automatically, for example, whenever the motor is stopped, or may require specific action on the part of the user. Automatic setting is preferred, however, because of the greater degree of security offered .
  • the stored code is changed periodically. More preferably, the code is changed each time the engine is turned off. Alternatively, the code may be changed each time the lock is used.
  • the code signal may be generated for storage in any convenient way.
  • the code may be generated on board the vehicle, in which case it may be derived from a data source such as the electronic engine management system.
  • the last eight digits of the number of engine ignition pulses during the last use of the engine may be used as a random number for the code.
  • other variable reference sources within the electronic management system may be used to generate the coded signals.
  • the function enabling means may be motor operation interdiction means, which may be located on or in the motor itself, preferably within a tamper-resistant housing.
  • the interdiction means may be a special purpose im obilizer or, if the motor is an internal combustion engine, may form part of the vehicle's engine management system.
  • the lock storage means comprises a shift register into which the control means clocks the coded signal upon actuation of the security system. The shift register outputs the coded signal to the control means when the lock is operated, by the legitimate key.
  • the shift register is operatively connected to the control unit via three lines, a first line of which is a power line which also carries a clock signal to the shift register, a second line of which forms a bi-directional data transmission line, and the third line of which is a ground line.
  • the coded signal may be provided to the control unit upon operation of a microswitch indicating to the control unit that operation of the lock has taken place. This causes the control unit to send a clock signal to the shift register and hence enable transmission of the stored coded signal from the lock storage means to the control unit.
  • Figure l is a schematic block diagram of a security system according to the invention.
  • Figure 2 is schematic view on an enlarged scale of the lock and code storage part of the system shown in Figure 1;
  • Figure 3 is a block schematic diagram of the code storage unit of the engine-operation interdiction unit embodiment of Figures 1 and 2;
  • Figure 4 is a schematic diagram illustrating a further embodiment of the invention, for building door locks and alarm systems.
  • the security system in the first embodiment illustrated in Figures 1 to 3, the security system, generally indicated 11, comprises an engine-operation function-enabling unit 10, which may be a central controller forming part of the engine management system, which is connected to an electronic code storage unit 12, hereinafter referred to as an encoder, positioned adjacent a lock barrel 16.
  • the lock could, for example, be that on the driver's door which when operated by a key causes the lock barrel 16 to turn and move a lock actuator lever 18 to open or lock the vehicle door.
  • the lock also carries a cam 20 which engages the actuating button of a micro-switch 14 which in turn is connected to the electronic encoder 12.
  • the central controller 10 may be located at any secure position on the engine, in such a way that its connections to the engine are effectively incorruptible, and is connected to the encoder 12 by a power/clock line 24, a bi-directional data line 26 and a ground line 28. These lines form part of the vehicle wiring harness which extends between the electronic units 10 and 12 inter alia for the purposes of energising a central locking system.
  • the central controller 10 When the vehicle engine is turned off the central controller 10 operates to immobilise the vehicle engine in any convenient way, for example by introducing an interruption into the ignition system control current path.
  • This may be an existing part of the engine management system or may be provided specially for a purpose.
  • this immobilising device will be part of the existing electronic engine management system since the micro-processor with which such a system is provided lends itself to secure disablement. In this way, the immobiliser forms an integral part of the engine such that the connections between it and the engine cannot be corrupted or bypassed by a would-be thief.
  • the security system 1 is enabled, thereby immobilising the engine, when the engine is turned off. In other embodiments (not shown) however, the system is enabled when the vehicle is locked. In either case, upon activation the central controller 10 clocks a coded signal into the lock encoder 12. In this embodiment the central controller 10 uses a random number for the coded signal which is taken from the last eight digits of the number of engine ignition pulses during the last operation of the engine, It is to be stressed. however, that the random number may be generated or otherwise determined in any other convenient way, such as from a pseudo-random number generator, it being merely a number drawn from any other source, such as one which is monitored by the vehicle management system. For vehicles without a central microprocessor management system a pseudo-random or random number generator micro chip may be operatively connected to the central controller 10.
  • Communication between the central controller 10 and the encoder module 12 is achieved using three wires where power/clock line 24 is set high in its normal state so that it powers the lock encoder.
  • the coded signal is fed to the encoder unit 12 along a bi- directional data line 26 which idles in a high state.
  • electronic encoder unit 12 includes a shift register 33 which is normally in receive mode, the register being clocked by a signal transmitted along power/clock line 24. When the engine is turned off the encoder 12 is loaded with the random number signal and controller 10 goes into an idle state.
  • the legal key is inserted in the key hole of lock 16 and turned to unlock the vehicle door, at the same operating micro-switch 14, which causes a short signal to be transmitted from electronic encoder 12 to central controller 10 to activate the microprocessor from its quiescent or idle state. This then clocks the number back from the lock encoder 12 and expects to find the same number as it generated when the engine was turned off. If the correct signal is returned the engine is enabled to run.
  • Micro-switch 14 is shown in an open position and is operatively connected to an inverter 30.
  • a signal is input to short monostable 31.
  • This is connected to a monostable device 32 having a relatively longer time period.
  • short monostable 31 is connected to OR gate 35 which is connected to line driver 36 which feeds an output/input port 27 of encoder 12.
  • Port 27 is connected to central controller 10 via the bi-directional data line 26.
  • the controller 10, thus raised to its active state causes a clock sequence to be carried on power line 24.
  • This line is connected to input port 25 of encoder 12 and is in turn connected to the clock input port 33c of shift register 33.
  • the shift register 33 having previously been loaded with the encoded signal is now caused to clock out the encoded signal at output port 33b.
  • the outputs from long monostable 32 and shift register 33 are input to AND gate 34 the output from which passes sequentially to OR gate 35, line drive 36 and bi ⁇ directional data port 27.
  • shift register 33 clocks the stored signal to central controller 10 which then effectively compares the received code with its own stored code. If the two codes are the same the interdiction device or immobiliser is deactivated and the engine can be started. Because it has to carry a code signal before the engine can be operated, the vehicle wiring harness is protected from corruption by cutting, joining or grounding the wires.
  • a cover plate 22 of steel or other mechanically strong material is provided, which is located between micro switch 14 and the outer door panel of the vehicle.
  • a secure housing of reinforced material or armoured steel may likewise be provided.
  • the process for changing a lock legitimately may then involve procedures such as those outlined above, requiring the use of a diagnostic tester and/or a time- consuming conspicuous activity or procedure which would be sufficiently long as to deter a criminal from attempting it. Likewise a long time delay and/or a password system may be employed. In any of these systems a central controller with a non-volatile memory is required.
  • FIG. 4 is a schematic view of a building security system with an electric door lock.
  • a door 37 has a lock 38 with a solenoid-operated bolt (not shown) .
  • Operation of a key (or entering a security code) in the lock causes a signal to be sent along line 39 to a remote function- enabling unit 41.
  • This signal is not merely a binary or open/closed signal representing the key position, but includes a code stored in a shift register associated securely with the lock.
  • the unit 41 Upon recognition of the code the unit 41 sends a lock-release signal along line 40 to energise the solenoid to release the lock bolt.
  • the key may act to initiate transmission of the code or may simply send a demand signal to the remote unit 41 with this being programmed to interrogate the code storage means (which may simply be a shift register) , to establish that this has retained its integrity, before transmitting a lock-release signal.
  • a fresh code may be generated and stored each time the last one has been interrogated, or on some other event such as the next occasion the lock is closed or locked.
  • the system also includes window and door sensors 42, connected by associated lines 43 to the function-enabling unit 41 and from this to an otherwise conventional burglar alarm unit 44 having an acoustic warning device 45.
  • the alarm unit 44 periodically requests the function-enabling unit to verify the integrity of the wiring and the sensors by interrogating for the stored code. If this does not return from the interrogation the alarm is triggered.
  • the verify period may be of any convenient length, typically between a fraction of a second and several seconds.
  • the normal function of the sensors to trigger the alarm in the event of the occurrence of an event to which they are sensitive is, of course, not affected.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lock And Its Accessories (AREA)

Abstract

On décrit un système de sécurité dans lequel une serrure (16) ou un capteur est doté de moyens de stockage de codes (12), reliés électriquement à un dispositif de validation de fonctions (10) autorisant l'utilisation d'une fonction seulement après réception du code approprié transmis par les moyens de stockage de codes. Le système comporte des moyens pour générer un code aléatoire ou pseudo-aléatoire dès qu'un évènement donné se produit et pour le transmettre aux moyens de stockage de codes. Le dispositif de validation de fonctions, situé à distance, comprend des moyens pour stocker le code transmis aux moyens de stockage de codes, et des moyens permettant d'interroger les moyens de stockage de codes afin de vérifier le code qui s'y trouve stocké, avant de valider la fonction concernée.
PCT/GB1993/001532 1992-07-23 1993-07-21 Systeme de securite Ceased WO1994002702A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB929215683A GB9215683D0 (en) 1992-07-23 1992-07-23 A motor vehicle security system
GB9215683.5 1992-07-23

Publications (1)

Publication Number Publication Date
WO1994002702A1 true WO1994002702A1 (fr) 1994-02-03

Family

ID=10719193

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/001532 Ceased WO1994002702A1 (fr) 1992-07-23 1993-07-21 Systeme de securite

Country Status (2)

Country Link
GB (2) GB9215683D0 (fr)
WO (1) WO1994002702A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9311572D0 (en) * 1993-06-04 1993-07-21 Carlson Alan R A 13 amp plug with pin and remote switching
KR0162932B1 (ko) * 1993-12-27 1998-12-15 쯔지 요시후미 차량 도난 방지 장치
GB2315585B (en) * 1993-12-27 1998-04-01 Nissan Motor Anti-theft car protection system
US5708307A (en) * 1994-11-02 1998-01-13 Nissan Motor Co., Ltd. Anti-theft car protection system
DE19805969C1 (de) * 1998-02-13 1999-08-19 Siemens Ag Diebstahlschutzsystem für ein Kraftfahrzeug und Verfahren zum Initialisieren des Diebstahlschutzsystems
US20020130554A1 (en) * 2000-08-02 2002-09-19 Banas Patrick Alexander Method and apparatus for vehicle security system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3006128A1 (de) * 1980-02-19 1981-08-20 Sachs Systemtechnik Gmbh, 8720 Schweinfurt Schliesseinrichtung
EP0065182A2 (fr) * 1981-05-12 1982-11-24 Alain Marie-Louis Mole Système d'identification électronique
EP0212046A2 (fr) * 1985-08-21 1987-03-04 VDO Adolf Schindling AG Système destiné à verrouiller et/ou déverrouiller un dispositif de sécurité
US4653605A (en) * 1984-11-21 1987-03-31 Zuck-Or, Ltd. Theft prevention apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2228602A (en) * 1989-02-27 1990-08-29 Shorrock Ltd A secure data communication system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3006128A1 (de) * 1980-02-19 1981-08-20 Sachs Systemtechnik Gmbh, 8720 Schweinfurt Schliesseinrichtung
EP0065182A2 (fr) * 1981-05-12 1982-11-24 Alain Marie-Louis Mole Système d'identification électronique
US4653605A (en) * 1984-11-21 1987-03-31 Zuck-Or, Ltd. Theft prevention apparatus
EP0212046A2 (fr) * 1985-08-21 1987-03-04 VDO Adolf Schindling AG Système destiné à verrouiller et/ou déverrouiller un dispositif de sécurité

Also Published As

Publication number Publication date
GB2269253A (en) 1994-02-02
GB9315096D0 (en) 1993-09-01
GB9215683D0 (en) 1992-09-09
GB2269253B (en) 1995-12-13

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