GB2289719A - Vehicle security system - Google Patents

Vehicle security system Download PDF

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Publication number
GB2289719A
GB2289719A GB9510256A GB9510256A GB2289719A GB 2289719 A GB2289719 A GB 2289719A GB 9510256 A GB9510256 A GB 9510256A GB 9510256 A GB9510256 A GB 9510256A GB 2289719 A GB2289719 A GB 2289719A
Authority
GB
United Kingdom
Prior art keywords
transmitter
signal
security system
vehicle security
power source
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.)
Granted
Application number
GB9510256A
Other versions
GB9510256D0 (en
GB2289719B (en
Inventor
Jeremy John Greenwood
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.)
MG Rover Group Ltd
Original Assignee
MG Rover Group 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 MG Rover Group Ltd filed Critical MG Rover Group Ltd
Publication of GB9510256D0 publication Critical patent/GB9510256D0/en
Publication of GB2289719A publication Critical patent/GB2289719A/en
Application granted granted Critical
Publication of GB2289719B publication Critical patent/GB2289719B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • 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
    • B60R25/20—Means to switch the anti-theft system on or off
    • B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
    • 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
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional 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
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • G07C2009/00365—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks in combination with a wake-up circuit
    • 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
    • G07C2009/00579—Power supply for the keyless data carrier
    • G07C2009/00603—Power supply for the keyless data carrier by power transmission from lock
    • G07C2009/00611—Power supply for the keyless data carrier by power transmission from lock by using inductive transmission
    • 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
    • G07C2009/00777—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 induction
    • 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
    • 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
    • G07C2009/00793—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 Hertzian waves

Landscapes

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

Abstract

The security system comprises a portable transmitter unit 30 having a transmitter circuit (36, Fig. 2) a power source (40), and a receiver coil 34 or photocell (52, Fig. 3) for receiving signals from a transmitter coil 22 or an infra-red radiation source (50, Fig. 3) mounted on the vehicle near the ignition lock 26. The transmitter circuit includes an electronic switch (44, Fig. 2) operated upon receipt of a coded signal from the coil 22 or radiation source to connect the power source (40) to a radio frequency transmitter (42) thereby to send a re-mobilize signal to a security control unit 10 on the vehicle. The power source is also connected to the receiver coil 34 or photocell so that, when a continuous low power signal is transmitted by the transmitter coil, power from that signal can be used to recharge the power source. The transmitter (42, Fig. 2) may be operated by a button-actuated switch (44) for vehicle door locking and unlocking. The unit 10 immobilizes the engine fuel injection system 15. The transmitter unit (230, Fig. 4) may include a microprocessor-controlled transmitter (242), the microprocessor (236) and transmitter having separate batteries (240, 241) powered from a receiver coil (234). <IMAGE>

Description

VEHICLE SECURITY SYSTEM This invention relates to a vehicle security system.
Our co-pending patent application No. 9403005.3 discloses a vehicle security system comprising a coil close to an ignition switch of the engine, an electronic control unit for energising the coil and a transponder comprising a coil, a switch, a power source and a transmitter whereby, in use, the coil of the transponder picks up a conventional alternating magnetic signal emitted by the coil close the ignition switch, and provides sufficient power to turn on the transponder switch which causes the transmitter to transmit an enabling or disabling signal to the electronic control unit, the electronic control unit being programmed to enable and disable at least part of the security system on receiving the correct signal.
It is a problem with this system that the power source will eventually run out, rendering the transmitter device inoperable.
Accordingly the present invention provides a vehicle security system comprising a portable transmitter unit having first transmitter means and a power source therefore, control means capable of enabling or disabling at least one component of the vehicle in response to signals from the first transmitter means, wherein the system further comprises second transmitter means housed in the vehicle near the ignition switch and receiver means in the transmitter unit connected to the power supply so that power transmitted by the second transmitter means can be used to recharge the power source the receiver means also being connected to switch means so that a signal from the second transmitter means can be used to operate the switch means to activate the first transmitter means.
Preferably the transmitter unit is arranged to distinguish between a re-mobilizing signal and a recharge signal sent by the second transmitter means and to transmit a signal only upon receipt of the re-mobilizing signal.
Preferably the recharge signal and the re-mobilizing signal can be distinguished by their lengths, or by the coding of at least one of them.
Preferably the second transmitter means is arranged to transmit a low power recharge signal for recharging the power source. Also the switch means may be arranged to operate only upon receipt of a more powerful signal than is required to recharge the power source.
The power supply to the second transmitter can conveniently be controlled by the control means, which may for example provide a continuous low power signal for recharging the power source, and a higher powered signal to operate the transmitter means.
The low power signal may be continuous and continue for the whole of the time that the vehicle ignition is on, or that the ignition key is in the ignition. Alternatively the second transmitter means may be controlled to produce a continuous coded signal which is used both to operate the first transmitter means and to recharge the power source.
The second transmitter means may comprise a transmitter coil or a transmitter of electro-magnetic radiation such as an infra-red transmitter.
The transmitter unit may be attached to a vehicle ignition key, and may even comprise the head of the vehicle ignition key.
Preferred embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings in which: Figure 1 is a diagrammatic view of a vehicle security system in accordance with first and second embodiments of the invention, Figure 2 is a schematic circuit diagram of the transmitter unit in the system of Figure 1, and Figure 3 is a diagrammatic view of a vehicle security system in accordance with a third embodiment of the invention.
Referring to Fig. 1, according to a first embodiment of the invention, a security control unit 10 which is mounted on a vehicle has various outputs 12 enabling it to immobilize the engine 14 of the vehicle, by disabling the fuel injection system 15, and operate locks 16 on the vehicle doors 18. The control unit 10 is connected to an R.F. receiver 20 and is arranged to unlock the doors 18 and re-mobilize the engine 14 upon receipt of a coded R.F. signal. A coil 22 is connected to the control unit 10 and is housed in a cowl 24 of the vehicle, close to a vehicle ignition lock 26. The control unit 10 is connected to the normal electrical outputs from the ignition lock 26 so that it can sense when the ignition key 28 is in the auxiliary, ignition and crank positions.
The ignition key 28 for the vehicle has an R.F. transmitter unit 30 attached to it. The transmitter unit 30 has a circuit 32, shown in detail in Figure 2, with a receiver coil 34 connected to it.
Referring to Figure 2 the circuit 32 comprises an R.F.
transmitter circuit 36 connected to the receiver coil 34 via a rectifier bridge circuit 38. A rechargeable power source 40 is connected to the rectifier circuit 38 in parallel with the transmitter circuit 36 so that it can be recharged from the receiver coil. A diode 42 on the positive side of the power source 40 prevents the power source from losing power back through the transmitter circuit. The transmitter circuit 36 is connected directly to the positive side of the power source 40 so that it can be powered by it.
The transmitter circuit 36 includes a transmitter 42, a manual switch 44 operated by a button (not shown) on the transmitter unit, and an electronic switch 46 controlled by the transmitter circuit. Each of the switches 44, 46 can be used to connect the power source 40 to the transmitter 42 thereby causing it to transmit a signal to the receiver 20 on the control unit 10.
Normally when the driver approaches the vehicle he will remobilize the engine 14 and unlock the doors 18 by pressing the button on the transmitter unit 30 which operates the manual switch 44, connecting the power source 40 to the transmitter 42 thereby sending a coded signal to the receiver 20 on the control unit. When he puts the key in the ignition lock 26 and turns it to the auxiliary position the control unit 10 starts to send a continuous low power recharge signal to the coil 22.
This signal is transmitted to the receiver coil 34, rectified by the rectifier circuit 38, and recharges the power source 40. The transmitter circuit is arranged not to be activated by the low power signal. The recharge signal continues until the vehicle ignition is turned off.
However if the driver has unlocked the doors using the key 28 in the door locks 16 the engine may still be immobilized when he enters the vehicle. This is particularly likely to happen if the security control unit 10 is programmed to immobilize the engine automatically when the driver leaves the vehicle.
The control unit 10 is arranged to detect the situation when the engine is immobilized and the key 28 is turned to the auxiliary position in the ignition lock 26. In this situation the control unit sends a coded re-mobilizing signal to the coil 22. The re-mobilizing signal is more powerful than the recharge signal. It is transmitted to the receiver coil 34 and detected by the transmitter circuit 36 which responds by operating the electronic switch 46 to connect the power supply 40 to the transmitter 42 thereby causing it to transmit a coded signal to the receiver 20 on the control unit 10.
According to a second embodiment of the invention, the system comprises the same components as those shown in Figures 1 and 2. However the control unit 10 is arranged to send out a single coded signal continuously for the entire time that the ignition key is in the ignition lock. This signal causes the transmitter circuit 36 to activate the transmitter 42, and is also used to recharge the battery 40. This arrangement is slightly simpler than the first embodiment since only one signal is sent by the transmitter coil 22. It also has the advantage that the control unit 10 could be programmed to check repeatedly or continuously for the return signal which would be sent from the transmitter 42 while the engine is running, and to take some action if the signal is not received such as activating an alarm. Alternatively the transmitter circuit 36 could be arranged to distinguish between signals from the transmitter coil 22 which are intended to cause the transmitter unit 30 to transmit and those which are only intended to recharge the battery 40. This can be done by using a short signal of a predetermined length for the re-mobilizing signal produced by the control unit 10 and a continuous signal for the recharging signal. This would allow the distinction to be made even though the re-mobilizing signal and recharge signal are of the same strength or are coded in the same way, or both. In a further alternative the re-mobilize and recharge signals could be coded in different ways so that they can be distinguished by the transmitter unit.
Referring to Figure 3, in the third embodiment of the invention, components corresponding to those in Figure 1 are indicated by the same reference numerals preceded by a 1. The only difference between the third embodiment and the second is that in the third embodiment the second transmitter means comprises a source of infra-red radiation 150 and the receiver means on the transmitter unit 130 comprises a photocell 152.
This arrangement can be easier to package in the vehicle because it will be less affected by metal components in the vehicle near the ignition, which might interfere with the signals from the transmitter coil in the first and second embodiments.
Referring to Figure 4, in the fourth embodiment of the invention, the transmitter circuit of the hand held transmitter unit 230 comprises a microprocessor 236 and a radio frequency transmitter 242, each of which has its own battery 240, 241. The batteries 240, 241 are in parallel and each is connected to the induction coil 234 via a diode 238, 239 so that it can be recharged. A light emitting diode 254 is powered by the same battery 241 as the transmitter 242. The transmitter 242 and LED 254 are connected via the microprocessor to ground so that the microprocessor can control them without the relatively high current which they use affecting the operation of the microprocessor. The advantage of having separate batteries is that the variations in voltage across the battery 241 caused by the transmitter 242 do not affect the operation of the microprocessor, as they can if the two are powered by the same battery.
The batteries 240, 241 are arranged so that the one 241 powering the transmitter 242 will go flat before the one 240 powering the microprocessor. This is possible because the microprocessor 236 and the transmitter 242 are operated by the same switch mechanism and only ever powered together, and ensures that the operation of the microprocessor will generally not be affected by its battery going flat because the battery 240 powering the transmitter 242 going flat can be used as an indication that both batteries should be replaced.

Claims (19)

CLAIMS:
1. A vehicle security system comprising a portable transmitter unit having first transmitter means and a power source therefore, control means capable of enabling or disabling at least one component of the vehicle in response to signals from the first transmitter means, wherein the system further comprises second transmitter means housed in the vehicle near the ignition switch and receiver means in the transmitter unit connected to the power supply so that power transmitted by the second transmitter means can be used to recharge the power source the receiver means also being connected to switch means so that a signal from the second transmitter means can be used to operate the switch means to activate the first transmitter means.
2. A vehicle security system according to claim 1 wherein the transmitter unit is arranged to distinguish between a re-mobilizing signal and a recharge signal sent by the second transmitter means and to transmit a signal only upon receipt of the re-mobilizing signal.
3. A vehicle security system according to claim 2 wherein the recharge signal and the re-mobilizing signal can be distinguished by their lengths.
4. A vehicle security system according to claim 2 wherein the recharge signal and the re-mobilizing signal can be distinguished by the coding of at least one of them.
5. A vehicle security system according to any foregoing claim wherein the second transmitter means is arranged to transmit a low power recharge signal for recharging the power source.
6. A vehicle security system according to claim 5 wherein the second transmitter means is arranged to transmit a higher powered re-mobilizing signal to operate the first transmitter means.
7. A vehicle security system according to any foregoing claim wherein the switch means is arranged to operate only upon receipt of a more powerful signal than is required to recharge the power source.
8. A vehicle security system according to any one of claims 2 to 5 wherein the recharge signal is substantially continuous.
9. A vehicle security system according to any one of claims 2 to 5 or 8 wherein the second transmitter means is arranged to transmit the recharge signal for substantially the whole of the time that the vehicle ignition is on.
10. A vehicle security system according to claim 1 wherein the second transmitter means is arranged to transmit a single signal to activate the first transmitter means and recharge the power source.
11. A vehicle security system according to claim 10 wherein said single signal is coded.
12. A vehicle security system according to any foregoing claim wherein the second transmitter means comprises a transmitter coil.
13. A vehicle security system according to any foregoing claim wherein the receiver means comprises a receiver coil.
14. A vehicle security system according to any one of claims 1 to 13 wherein the second transmitter means comprises a source of electro-magnetic radiation.
15. A vehicle security system according to claim 14 wherein the receiver means comprises a photocell.
16. A vehicle security system according to any foregoing claim wherein the transmitter unit further comprises control means for controlling the transmitter means and a further power source for the control means.
17. A vehicle security system according to claim 16 wherein the power source for the control means is capable of powering the control means for a longer period that the power source for the transmitter means is capable of powering the transmitter means.
18. A vehicle security system according to any foregoing claim wherein the power supply to the second transmitter means is controlled by the control means.
19. A vehicle security system substantially as hereinbefore described with reference to Figures 1 and 2, Figure 3 or Figure 4 of the accompanying drawings.
GB9510256A 1994-05-26 1995-05-22 Vehicle security system Expired - Fee Related GB2289719B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9410569A GB9410569D0 (en) 1994-05-26 1994-05-26 Vehicle security system

Publications (3)

Publication Number Publication Date
GB9510256D0 GB9510256D0 (en) 1995-07-19
GB2289719A true GB2289719A (en) 1995-11-29
GB2289719B GB2289719B (en) 1998-02-18

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GB9410569A Pending GB9410569D0 (en) 1994-05-26 1994-05-26 Vehicle security system
GB9510256A Expired - Fee Related GB2289719B (en) 1994-05-26 1995-05-22 Vehicle security system

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB9410569A Pending GB9410569D0 (en) 1994-05-26 1994-05-26 Vehicle security system

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2306572A (en) * 1995-10-26 1997-05-07 Daimler Benz Ag Electronic ignition lock prevents unintended activation of immobilizer with key in lock; also allows second key to unlock boot, etc., with first key in lock
GB2306573A (en) * 1995-10-26 1997-05-07 Daimler Benz Ag Key/vehicle communication device prevents accidental activation of central locking or immobilizer with key in steering lock
EP0778183A1 (en) * 1995-12-06 1997-06-11 MAGNETI MARELLI S.p.A. A device for supplying a remote-control unit
GB2309488A (en) * 1996-01-27 1997-07-30 Motorola Inc Vehicle security arrangement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887312A (en) * 1987-09-14 1989-12-12 Siemens Aktiengesellschaft Method and apparatus for transmission of optical data between two electrically separated transmitting receiving units
WO1993002897A1 (en) * 1991-07-30 1993-02-18 General Motors-Holden's Automotive Limited Vehicle security system
EP0640517A1 (en) * 1993-08-30 1995-03-01 Kabushiki Kaisha Tokai Rika Denki Seisakusho Vehicular antitheft apparatus using an identification transmitted from a key to allow engine starting

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887312A (en) * 1987-09-14 1989-12-12 Siemens Aktiengesellschaft Method and apparatus for transmission of optical data between two electrically separated transmitting receiving units
WO1993002897A1 (en) * 1991-07-30 1993-02-18 General Motors-Holden's Automotive Limited Vehicle security system
EP0640517A1 (en) * 1993-08-30 1995-03-01 Kabushiki Kaisha Tokai Rika Denki Seisakusho Vehicular antitheft apparatus using an identification transmitted from a key to allow engine starting

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2306572A (en) * 1995-10-26 1997-05-07 Daimler Benz Ag Electronic ignition lock prevents unintended activation of immobilizer with key in lock; also allows second key to unlock boot, etc., with first key in lock
GB2306573A (en) * 1995-10-26 1997-05-07 Daimler Benz Ag Key/vehicle communication device prevents accidental activation of central locking or immobilizer with key in steering lock
GB2306573B (en) * 1995-10-26 1997-09-17 Daimler Benz Ag A Key/vehicle communication device
GB2306572B (en) * 1995-10-26 1997-09-24 Daimler Benz Ag Ignition key-vehicle communication device
US5808372A (en) * 1995-10-26 1998-09-15 Mercedes-Benz Ag Ignition key-vehicle communication device which is protected against incorrect operation
US5869908A (en) * 1995-10-26 1999-02-09 Mercedes-Benz Ag Key/vehicle communication device for the activation of an immobilizer and of a remotely controllable function
EP0778183A1 (en) * 1995-12-06 1997-06-11 MAGNETI MARELLI S.p.A. A device for supplying a remote-control unit
GB2309488A (en) * 1996-01-27 1997-07-30 Motorola Inc Vehicle security arrangement

Also Published As

Publication number Publication date
GB9510256D0 (en) 1995-07-19
GB9410569D0 (en) 1994-07-13
GB2289719B (en) 1998-02-18

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732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20010522