WO1993013968A1 - Dispositif pour immobiliser un vehicule - Google Patents

Dispositif pour immobiliser un vehicule Download PDF

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Publication number
WO1993013968A1
WO1993013968A1 PCT/GB1993/000015 GB9300015W WO9313968A1 WO 1993013968 A1 WO1993013968 A1 WO 1993013968A1 GB 9300015 W GB9300015 W GB 9300015W WO 9313968 A1 WO9313968 A1 WO 9313968A1
Authority
WO
WIPO (PCT)
Prior art keywords
engine
immobilizer
key
immobilizing
signal
Prior art date
Application number
PCT/GB1993/000015
Other languages
English (en)
Inventor
Geoffrey Francis Hart
Brian Tapp
Original Assignee
Geoffrey Francis Hart
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 Geoffrey Francis Hart filed Critical Geoffrey Francis Hart
Priority to GB9413764A priority Critical patent/GB2278158B/en
Publication of WO1993013968A1 publication Critical patent/WO1993013968A1/fr

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Classifications

    • 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
    • B60R25/20—Means to switch the anti-theft system on or off
    • B60R25/21—Means to switch the anti-theft system on or off using hidden switches
    • 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
    • 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
    • B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
    • B60R25/1003—Alarm systems characterised by arm or disarm features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder

Definitions

  • This invention relates to an immobilizer for a vehicle, for example a motor car, to make the vehicle more difficult to steal.
  • the immobilizer may comprise a timer so that the engine is allowed to start and run for a few seconds and is then immobilized unless the correct code is input or switch closed. This gives the thief the impression that the car is not in fact immobilized but merely a bad starter.
  • the immobilizer may disable the ignition, fuel supply or starter motor of the vehicle.
  • Vehicle immobilizers have been used having keys in which distinctive coded information is stored and means for reading the coded information in the keys, which will only allow the engine to be activated if the right key is used.
  • the coded information may be in the form of a distinctive electronic circuit, for example, which may present a far greater variety of combinations than conventional mechanical keys.
  • a thief cuts the wires connecting a central computer and a device for engaging the key, information in the key cannot be read properly and the vehicle cannot be operated.
  • Such systems may have the disadvantage that the key must be left engaged with the reading means or the engine will become immobilized. There is a danger that the engine may become immobilized by accident if the key becomes accidentally disengaged.
  • US 4777377 provides a vehicle immobilizer which acts by locking the brakes of the vehicle and which is engaged or disengaged by the insertion of a magnetic card carrying coded information.
  • the card may be removed from the reader while the engine is running but normally stays in position and there is still a danger that it may become disengaged and engaged (for example, by a child playing with the device) leading to the engine being immobilized by accident.
  • the first aspect of the invention provides an immobilizing system for a vehicle as set forth in Claim 1 or Claim 6, preferred and/or optional features of the immobilizer being set forth in Claims 2 to 7.
  • the first aspect of the invention is particularly suitable for use in any type of vehicle, for example a motor car, and in particular a spark ignition engined vehicle.
  • the engine is only operable if the correct key having coded information is used.
  • the system does not rely upon concealed switches or keypads operated from memory.
  • a keypad operated system has the disadvantage that the code must be given to anybody who is authorized to operate the engine and that the code may eventually be given to a large number of people. Where a secret coded key is used, anybody who is permitted to use it will not learn the code inside it.
  • the time period may be fixed by the processor or it may be variable. It may of the order of 1 second or 60 seconds, preferably it is greater than about 3 seconds and less than about 10 seconds or 30 seconds, most preferably it is 5 seconds.
  • the key may be in the form of a device having a distinctive electrical circuit, a device for transmitting a distinctive signal (comprising sonic, electromagnetic or magnetic impulses) when the key is engaged with the receiver, a magnetic strip or a bar code, for example.
  • a distinctive signal comprising sonic, electromagnetic or magnetic impulses
  • the key may be engaged with the receiver simply by placing it in a specific position with respect to the receiver.
  • the immobilizing device may inactivate any or all of the starter motor, a fuel pump or (in the case of a spark ignition en ⁇ ine) the ignition coil or the make and break and may operate by opening a circuit breaker in the power supply to such devices or by short circuiting such components.
  • the device may lock the brakes or steering.
  • the immobilizer may be of the type which is reset when the engine is stopped, so that the engine may only be started again if the coded key is used again.
  • the engine is allowed to operate if the coded key engages the receiver for a limited period of time, so that the key may be removed from the receiver after the limited period of time without immobilizing the engine.
  • This embodiment has the advantage that the key need not be engeaged all the time the vehicle is operating.
  • the key of the immobilizer can be removed after the vehicle is rendered operable and kept away from the immobilizer. This can prevent for example a vehicle being immobilized while in motion, for example by children playing with keys or switches. This can provide an improvement in the safety of the system.
  • a device may be incorporated to prevent the engine becoming immobilized immediately the engine stops so that the engine can be restarted again if it stalls without having to use the coded key.
  • a period of time of, say, 5, 10, 15 or 30 seconds may be left before the engine becomes immobilized .
  • the immobilizing signal may also be used to arm an alarm system, whereby any attempt to enter the vehicle or start it when the engine is immobilized will trigger an alarm.
  • the key may comprise an electrical jack for making electrical contact with a socket on the decoder means (or vice versa).
  • the key has coded information in the form of a distinctive electronic circuit.
  • the electronic circuit may comprise any combination of distinctive electronic elements, for example resistors, capacitors, transistors etc. There are thousands of combinations of these devices which will provide a greater degree of security than ordinary me ⁇ hani ⁇ al keys.
  • the processor has means for allowing the information stored in the key to be read.
  • an electrical contact may be used as described above, or means for receiving sonic, electric or other signals representative of the information stored in the key if the key is a transmitter type.
  • the processor may be in electrical contact with the reading means.
  • the processor can then be placed in a remote position from the reading means and is preferably concealed inside the machinery of the vehicle where it is very difficult for a thief to gain access to it. The only accessible part of the system will then be the reading means. If the contact between this reading means and the computing means is broken, the computing means will be unable to read the code stored in the key.
  • a conventional mechanical key only acts to make or break a circuit. It can easily be overridden by cutting the wires between the lock and the engine or by applying a voltage to them.
  • a thief may still be able to circumvent the immobilizer if he understands how the engine has been immobilized. For instance, if a component such as the make-and-break is inactivated by creating a short-circuit across it, the thief could attempt to make the engine workable again by cutting the leads creating the short-circuit. If a component such as the ignition switch is inactivated by a circuit breaker in series with the component, a thief could make the component work by ' hot wiring' the coil, by applying a voltage across the terminals of the component directly.
  • the processor, immobilizing means and the component to be immobilized may be effectively integral or so constructed that if any part of the processor is interferred with, for instance by cutting or otherwise damaging it, the component of the engine will also be damaged so that the engine will not be operable. This may be achieved, for example, by enclosing the processor, immobilizing means and component in a block of resin. The block must be made so that heat generated by the circuitry will be adequately conducted away from the circuitry.
  • the processor, immobilizing means and the component may be contained together inside a casing which is strong and rigid.
  • the processor and component may be fixed to the casing (by resin filling) in such a way that if the casing is opened by force, the component will be damaged.
  • an immobilizing device in which a component of the engine is rendered inoperable by short-circuiting it using a switch or similar device (for example a silicon controlled rectifier) there is always the danger that a thief will cut the wires to the switch so that the short-circuit cannot be formed.
  • the terminals of the switch may be be connected to respective terminals of the component through thick connections, rather than just connected by thin wire.
  • the switch may be bolted directly across the terminals of the component or welded to the terminals of the component or connected to the terminals of the component by relatively thick bar material.
  • the connection material is thick and difficult to cut.
  • an immobilizer comprises a switch for short-circuiting the component (e. g. make and break, ignition)
  • the switch may be bolted, welded or otherwise connected to the terminal of the component receiving power from the battery and to the frame of the vehicle, so that the switch annot be easily disconnected.
  • the second aspect of the invention provides an immobilizing device for a spark ignition engine as set forth in Claim 7 or 13, preferred and/or optional features of the immobilizing device being set forth in Claims 8 to 12.
  • the first circuit comprises means for feeding current to a starter motor and means for feeding current to ancillary equipment of the engine which will be required when the engine is running, for example a fuel pump or, in the case of spark ignition engine, the ignition coil.
  • the first circuit may include an ignition piezo.
  • the second circuit provides current for the engine anciliaries and may contain an ignition piezo.
  • the second aspect of the invention provides an immobilizing device for a spark ignition engine, for example a petrol engine of the type in which the ignition switch has a "start" position in which current from the battery is passed directly to the ignition coil when the engine starter is running to boost the ignition coil current.
  • the ignition switch is switched to the "running” position in which the current to the starter motor is disconnected and current from the battery is passed to the ignition coil via a ballast resistor, so that the current passing through the ignition coil is lower.
  • the second aspect of the invention may allow the engine to be immobilized by preventing current reaching the ignition coil only when the ignition is in the "running" position. This may be done by including a circuit breaker in series with the ballast resistor or by earthing the ballast resistor so that only a very small current passes through the ignition coil.
  • the immobilizing device may be combined with the immobilizer of the first aspect of the invention.
  • simple manual switches in concealed places may be used, or a second manual key or any similar device.
  • the third aspect of the invention provides an immobilizer as set forth in Claim 11 or 23. Preferred and/or optional features of the third aspect of the invention are set forth in Claims 12 to 22.
  • the third aspect of the invention provides that the key must be removed from the controller in order to allow the vehicle to operate. Therefore the key must be taken away from a place where there is a danger that it will be accidentally used to immobilize the engine while still running.
  • the controller will be switched by operation of the key from whichever state it is in to the opposite state. For example, if the controller is in a state in which the engine is immobilized when the key is presented (for example by inactivating a component of the engine), the controller will switch to allow the engine to operate. Conversely, if the controller is in a state in which the engine is permitted to operate and the key is presented to it, the controller will switch so that the engine is immobilized. This system of operation is very simple.
  • a light may be provided on the dashboard of the. vehicle to indicate which state the controller is in.
  • the key is presented to the controller in exactly the same way to change the state of the controller either way and the change signal given by the controller is preferably the same in each case.
  • the state of the controller is changed only when the key is both inserted and, maybe within a preset period of time, removed again.
  • the third aspect of the invention may be used with the immobilizer of the second aspect of the invention, or with the first aspect of the invention.
  • the form of key, receiver, immobilizing device and processor may be as suggested for the first aspect of the invention.
  • the fourth aspect of the invention provides an immobilizer for an engine as set forth in Claim 27 or 30.
  • Preferred and/or optional features of the invention are set forth in Claims 28 to 29.
  • the fourth aspect of the invention may be combined with the systems of the first or third aspect of the invention.
  • the fourth aspect of the invention is intended to defeat attempts, for example by thieves of motor cars, to release an immobilized engine by systematically inputting all the possible signals to the device.
  • the time delay between the correct signal being input and the signal being given to the immobilizing means is brief and not a problem to a person in possession of the correct key or code.
  • the aggregate delay due to all the time lapses is excessive.
  • FIG. 1 is a schematic illustration of the vehicle immobilizer which is used with the first aspect of the invention
  • Figure 2 is a schematic diagram of a first embodiment of the immobilizing device of the second aspect of the invention, included in the operating circuit of a spark ignition engine;
  • Figure 3 is a schematic diagram of a second embodiment of the immobilizing device of the second aspect of the invention, included in the operating circuit of a spark ignition engine;
  • Figure 4 is a schematic diagram of the operation of the first aspect of the invention-
  • Figure 5 shows a block diagram for a device according to the first aspect of the invention
  • Figure 6 shows a flow chart for the operation of the immobilizer of the third aspect of the invention
  • Figure 7 is a schematic illustration of an immobiliser according to a fourth aspect of the invention.
  • FIG. 1 is a schematic illustration of an immobilizer for example for a vehicle, in which a key 1 is shown in cross section and on an enlarged scale. Coded information is stored in an electronic element 2 inside the key 1, which is provided with contacts 3 on a jack portion of the key 1.
  • the key 1 engages decoder means in the form of a receiver having a socket 4 which is electrically connected to computing means in the form of a processor 7.
  • the processor 7 controls an immobilizing device 10.
  • the key 1 engages the socket 4 (also shown in cross section and on an enlarged scale) which has contacts 5 for engaging the contacts 3 on the key.
  • the socket 4 serves to put the electronic element 2 in the key into contact with the processor 7 through the contacts 3 and 5 and electrical lines 6.
  • the socket 4 may be mounted on or near the dashboard of the car where it is accessible to the driver.
  • the position of the socket 4 in the dashboard may be such that it is difficult to spot for anybody not familiar with the car - it may be in the same place on all cars of the same make or in different places from car to car.
  • Conventional motor operation circuitry is shown schematically at 8. This includes a conventional mechanical ignition key.
  • the immobilizing device 10 can prevent the circuity 8 from operating the engine 9 if an immobilizing signal is given by processor 7.
  • key 1 is inserted in socket 4.
  • Key-detecting means may be provided to give a signal to processor 7 whereby the key-reading process starts.
  • Processor 7 sends signals to or receives signals from the key 1 by electrical lines 6.
  • the coded information stored in electronic element 2 is analysed by the processor 7, for example to see if it has the right resonance characteristics, right resistance, right logic array etc.
  • Each individual car is set up with a different processor 7 to recognise a single individual key 1. If the right key 1 is in socket 4, the processor 7 gives a signal to the immobilizing device 10.
  • Figure 2 shows an embodiment of immobilizing means 10.
  • Figure 2 is a schematic diagram of the wiring of a spark ignition engine which is operated by a mechanical key 11 shown engaging ignition switch 12.
  • the ignition has a first or “off” position in which no current is delivered from the battery 13 to the engine.
  • a second or “start” position current from the battery 13 is delivered to a first circuit which comprises a relay 14 which makes contact across terminals 15 so that current is delivered to the motor 16 to start the engine.
  • a wire 17 allows current to be delivered at the same time to the primary coil 18 of the ignition so that the sparking system indicated schematically by circuit breaker 20, secondary coil 21 and sparking plug 22 may operate.
  • the ignition switch 12 has a third or "running" position in which no current is passed to the relay 14 or wire 17. Instead, current passes via a second circuit comprising a ballast resistor 19 to the primary coil 18 of the ignition so that a reduced current flows through the ignition when the engine is running normally.
  • the immobilizing device 10 comprises a conductor joining the second circuit to earth.
  • the conductor comprises a switch device 23 operable by a processor 7.
  • switch device 23 earths the resistor 19 so that a minimal current flows through ballast resistor 19 and primary coil 18 when the ignition switch 12 is in the "running" position.
  • the sparking plug 22 will therefore not operate properly and the engine dies.
  • Device 23 should also comprise a resistor, to prevent the current from the battery becoming too large. The resistance of the resistor is chosen such that the majority of the current flows through switch 23, rather than through the ballast resistor 19.
  • the processor 7 can alter the state of switch 23 to allow the engine to be operated, the connection between key 11 and earth being broken so that current flows through ballast resistor 19 and the primary coil 18 when the ignition switch 12 is in the "running" position. Sparks are therefore generated by the sparking plug 22 and the engine operates normally.
  • Figure 3 is a schematic diagram of a second embodiment of the immobilising device. An engine operating circuit substantially as in Figure 2 is shown, in which similar figure numbering indicates similar components.
  • switch means 24 in series with the ballast resistor 19.
  • the switch means 24 is controllable by signals from processor 7.
  • switch 24 When the engine is immobilized, switch 24 is used to break the connection between ballast resistor 19 and the primary coil 18. Again, the first circuit comprising relay 14 and conductor 17 is not affected by switch means 24 and it is possible to start the engine and commence sparking in the normal manner with the ignition switch 12 in the "start" position.
  • the ignition switch 12 is put into its "running” position, no current passes through ballast resistor, switch means 24 or primary coil 18 and no sparks are produced by the sparking plug 22. Therefore, the engine dies.
  • ballast resistor 19 When the microprocessor is used to remobilize the engine, a signal is given to switch means 24 to make contact between ballast resistor 19 and primary coil 18. In this case, when the ignition switch 12 is returned to its "running" position, current flows via ballast resistor 19 and primary coil 18 in the normal manner so that sparks are generated by sparking plug 22 and so that the engine operates normally.
  • FIG. 4 is a schematic illustration of the operation of the immobilizer of the invention.
  • a controller 26 comprises the receiver 4, processor 7 and immobilising means 10 as shown in figure 1.
  • a signal is given to a timer 27 incorporated in the processor 7, which gives a signal 28 to immobilizing device 10 a set or randomly variable time period after the signal from engine 9 is received.
  • signal 28 could be given by the timer 27 and interrupted a preset or randomly variable time period after the signal is given by engine 9. This time period may be from 1 to 60 seconds, preferably 10 to 30 seconds, most preferably 15 seconds, though it could be longer or shorter.
  • the immobilizing device 10 may be any suitable form of immobilizing device for engine 9, for example it could interrupt the operation of the fuel pump, spark ignition system or starter. In a preferred embodiment, the immobilizing device is as set out in Figures 2 or 3.
  • Signal 28 could also be used to trigger an alarm system.
  • the processor In order to prevent the immobilizing device 10 immobilizing the engine 9, the processor outputs an override signal 29 if a key having the correct coded information stored therein is engaged with receiver 4.
  • the override signal 29 prevents the immobilizing device 10 inactivating the engine 9.
  • Figure 5 shows a block diagram of the immobilizer of the invention.
  • FIG. 5 shows the components of the immobilizer, the main battery B of the vehicle, the ignition switch SW and contacts Tl and T2 for providing power from the main battery B to a component of the engine. No other components are shown.
  • the immobilizer comprises a receiver 4 for engaging a key 1 having coded information stored therein and a processor 7 indicated by components within the dotted line. When switch SW is closed, processor 7 receives power from the main battery B.
  • the processor 7 comprises a comparator
  • Comparator 30 comprising a memory such as a _____ for storing a code particular to the vehicle. Comparator 30 is put into electrical contact with a distinctive electrical circuit contained in key 1 when key 1 is engaged with receiver 4, whereby the comparator 30 can output a signal on line
  • switch SI which allows power to be supplied to the component of the engine through connection T2.
  • a feedback via a resistor 34 or diode is provided to keep the relay 33 closed when switch SI is closed. Therefore, once key 1 has been recognised, switch 1 will remain closed until switch SW is opened again, so that the vehicle remains mobilized even if key 1 is removed from receiver 4.
  • a circuit 35 is provided to indicate via LED 36 whether the engine is immobilised or not or a failure of components 32 or 33.
  • a timer 37 is provided which commences timing as soon as switch SW is closed. As long as S2 is closed, power is supplied to the component via T2 whether or not the correct key 1 has been inserted.
  • Relay 39 is not energized at this stage and switch S2 is closed. After a time period of preferably 15 seconds, timer 37 gives a signal on 38, relay 39 is energised and switch S2 is opened. If key 1 has not been presented to receiver 4, neither SI or S2 will then be closed, and power will no longer be given to the component of the vehicle engine and the engine will be immobilized.
  • the system shown in Figure 5 may comprise a further timer (not shown) for providing power to relay 33 directly from the main battery B for a brief period of time, for example 3 to 30 seconds or 5 to 10 seconds after switch SW is closed, whereby switch SI will remain closed for this period of time after SW is open.
  • a further timer for providing power to relay 33 directly from the main battery B for a brief period of time, for example 3 to 30 seconds or 5 to 10 seconds after switch SW is closed, whereby switch SI will remain closed for this period of time after SW is open.
  • the timer 37 may be set up so that it resets as soon as the engine dies. In that case, any attempt to start the engine by an unauthorized person follows the same cycle of start followed by failure after a period of time. However, timer 37 may include an additional timer to prevent the timer 37 resetting for a short period of time after the engine dies. If the timer does not reset, switch S2 remains open. This period of time may be set or random and it may be 1 to 5 seconds, preferably about 2 or 3 seconds. In this case, the first attempt by an unauthorized person to start the engine will lead to the engine starting and stopping a period of time later, but any attempt to restart the engine after it has died and before the period of the additional timer is up will lead to the engine not even starting. This is because the timer has not reset and switch S2 remains open as long as the additional timer is counting.
  • the immobilizer acts by preventing current from being supplied to a component by opening switches SI and S2. Equally, switches SI and S2 could be closed by the immobilizer to short circuit the component and deactivate it in this way.
  • FIG 6 shows a flowchart for the operation of the immobilizer according to the third aspect of the invention.
  • the system is activated when the power for the vehicle is switched on using the ignition key. If no coded key 1 (as shown in Figure 1) has been inserted, the immobilizer either takes no action or a signal may be given to trigger an alarm system.
  • the immobilizer may take no action or, again, trigger an alarm system.
  • the key 1 must be removed from the receiver in order to give a signal to the microprocessor.
  • the microprocessor may commence a timer and if the key is not removed after a fixed period of time, the microprocessor takes no action or triggers a warning light to instruct the operator to remove the key 1.
  • a signal is given to the microprocessor.
  • the signal given to the microprocessor will switch the state of the immobilizing device from whichever state it is in to the other state. Thus if the motor is currently immobilized by the immobilizing means, inserting the key 1 will trigger the microprocessor to activate the vehicle.
  • the processor 7, signal wires 29 and 28, immobilizing means 10 and the component of the engine 6 on which immobilizing device 10 acts may be enclosed in a casing or block of resin in such a manner that it is not possible to break into the casing or block of resin to find the terminals of processor 7 or immobilizing device 10 (for example, to start the component of the engine by hot wiring across its terminals) without destroying or damaging the component of the engine.
  • the immobilizing device 10 may either operate by breaking the power supply to the component of the engine or by creating a short circuit across the terminals.
  • the component cannot be reactivated by interfering with the terminals of the immobilizing device, as they are not accessible without risking breaking the component.
  • the only leads going into the block or casing will be the leads carrying power for the component, which may not be broken without preventing the component working, and leads carrying coded information from receiver 4. If these are broken, the correct coded information will not be read by processor 7 and the immobilizing device will not be permitted to activate the component.
  • the immobilizing device operates by creating a short circuit across the terminals of the component of the engine, it may comprise a rigid casing with the processor and a switch operated by the processor inside the casing, the terminals of the immobilizing device being fixed to the terminals of the component by thick, relatively solid connections which are difficult to cut.
  • the switch may be incorporated in a rigid casing with the processor 7 and connected to the respective terminal of the component and to the frame of the vehicle (representing earth) by thick, solid connections.
  • FIG. 7 shows an immobilizer according to the fourth aspect of the invention.
  • the immobilizer is of the kind in which an engine 42 is immobilized by the immobilizer for example by the inactivation of an essential component such as a fuel pump etc.
  • processor 41 receives the correct coded signal input by the operator, processor 41 gives a signal on 43 and the immobilizer releases the engine .
  • the coded signal is input by the use of a coded key 40 which is analysed by the processor 41.
  • the activate signal 43 is not given immediately the correct coded signal is input to processor 41.
  • the activate signal is given.
  • the activate signal is given along an electrical conductor 43.
  • the electrical conductor 43 is connected to earth via a capacitor 44.
  • no signal is given to the immobilizing device in engine 42 until capacitor 44 has charged up. Therefore, a time delay is introduced between the correct coded signal being input to processor 41 and engine 42 being released, the time delay corresponding to the charging time of the capacitor.

Abstract

On décrit un dispositif pour immobiliser un véhicule qui ne permet pas au voleur de se rendre compte facilement que le véhicule a été immobilisé. Le dispositif d'immobilisation ne peut être actionné que par une personne possédant une clé à code électronique et il comporte un processeur (7) et un moyen (10) pour immobiliser le moteur (9) en réponse à un signal d'immobilisation émis par le processeur (7) au bout d'un temps fixé après que le moteur a démarré. La clé (1) contenant une information codée enregistrée peut s'engager dans un récepteur (4) qui est connecté électriquement avec le processeur (7), ce dernier émettant un signal de désactivation du moyen d'immobilisation du moteur (4) lorsque l'information enregistrée dans la clé (1) correspond à l'information enregistrée dans le processeur (7).
PCT/GB1993/000015 1992-01-07 1993-01-07 Dispositif pour immobiliser un vehicule WO1993013968A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9413764A GB2278158B (en) 1992-01-07 1993-01-07 Vehicle immobilizer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9200229A GB9200229D0 (en) 1992-01-07 1992-01-07 Vehicle immobilizer
GB9200229.4 1992-01-07

Publications (1)

Publication Number Publication Date
WO1993013968A1 true WO1993013968A1 (fr) 1993-07-22

Family

ID=10708203

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/000015 WO1993013968A1 (fr) 1992-01-07 1993-01-07 Dispositif pour immobiliser un vehicule

Country Status (3)

Country Link
AU (1) AU3261793A (fr)
GB (2) GB9200229D0 (fr)
WO (1) WO1993013968A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994026565A1 (fr) * 1993-05-11 1994-11-24 Carton, Angela Systeme de securite
EP0785114A2 (fr) * 1996-01-16 1997-07-23 Ford Motor Company Procédé et dispositif de protection amélioré pour véhicule
WO1999015378A1 (fr) * 1997-09-25 1999-04-01 Johnson Controls Technology Company Systeme antivol servant a mettre un moteur de vehicule hors service
EP0719682B1 (fr) * 1994-12-28 2000-02-23 Mazda Motor Corporation Dispositif antivol pour véhicule automobile
EP0967130A3 (fr) * 1994-09-26 2000-03-22 Denso Corporation Dispositif anti-vol pour voitures
WO2009021599A1 (fr) * 2007-08-10 2009-02-19 Bayerische Motoren Werke Aktiengesellschaft Frein électromécanique de stationnement pour véhicule automobile
US8838325B2 (en) 2011-09-12 2014-09-16 Ford Global Technologies Vehicle shut-down functionality for peps-equipped vehicles

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EP0377128A1 (fr) * 1988-12-30 1990-07-11 Griesemer, Albert Dispositif d'allumage pour véhicules

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US4749873A (en) * 1985-07-25 1988-06-07 Toyota Jidosha Kabushiki Kaisha Anti-theft device for an automobile
US4777377A (en) * 1985-09-06 1988-10-11 Jeter Herman C Vehicle anti-theft system
EP0377128A1 (fr) * 1988-12-30 1990-07-11 Griesemer, Albert Dispositif d'allumage pour véhicules

Cited By (11)

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WO1994026565A1 (fr) * 1993-05-11 1994-11-24 Carton, Angela Systeme de securite
EP0967130A3 (fr) * 1994-09-26 2000-03-22 Denso Corporation Dispositif anti-vol pour voitures
EP0719682B1 (fr) * 1994-12-28 2000-02-23 Mazda Motor Corporation Dispositif antivol pour véhicule automobile
EP0785114A2 (fr) * 1996-01-16 1997-07-23 Ford Motor Company Procédé et dispositif de protection amélioré pour véhicule
EP0785114A3 (fr) * 1996-01-16 1998-01-28 Ford Motor Company Procédé et dispositif de protection amélioré pour véhicule
WO1999015378A1 (fr) * 1997-09-25 1999-04-01 Johnson Controls Technology Company Systeme antivol servant a mettre un moteur de vehicule hors service
US5977654A (en) * 1997-09-25 1999-11-02 Johnson Controls Technology Company Anti-theft System for disabling a vehicle engine that includes a multi-contact switch for disconnecting the battery and loading the vehicle electrical system
WO2009021599A1 (fr) * 2007-08-10 2009-02-19 Bayerische Motoren Werke Aktiengesellschaft Frein électromécanique de stationnement pour véhicule automobile
US8359136B2 (en) 2007-08-10 2013-01-22 Bayerische Motoren Werke Aktiengesellschaft Electromechanical parking brake for a motor vehicle
US8838325B2 (en) 2011-09-12 2014-09-16 Ford Global Technologies Vehicle shut-down functionality for peps-equipped vehicles
US9002569B2 (en) 2011-09-12 2015-04-07 Ford Global Technologies Vehicle shut-down functionality for PEPS-equipped vehicles

Also Published As

Publication number Publication date
GB2278158B (en) 1996-03-27
GB9200229D0 (en) 1992-02-26
GB9413764D0 (en) 1994-09-28
GB2278158A (en) 1994-11-23
AU3261793A (en) 1993-08-03

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