GB2316713A - Vehicle security system - Google Patents

Vehicle security system Download PDF

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Publication number
GB2316713A
GB2316713A GB9721304A GB9721304A GB2316713A GB 2316713 A GB2316713 A GB 2316713A GB 9721304 A GB9721304 A GB 9721304A GB 9721304 A GB9721304 A GB 9721304A GB 2316713 A GB2316713 A GB 2316713A
Authority
GB
United Kingdom
Prior art keywords
key
signal
ignition lock
transmitter
vehicle
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
GB9721304A
Other versions
GB9721304D0 (en
GB2316713B (en
Inventor
Kevin Trevor Talbot
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
Priority claimed from GB9403005A external-priority patent/GB9403005D0/en
Priority claimed from GB9407072A external-priority patent/GB9407072D0/en
Application filed by MG Rover Group Ltd filed Critical MG Rover Group Ltd
Priority to GB9721304A priority Critical patent/GB2316713B/en
Publication of GB9721304D0 publication Critical patent/GB9721304D0/en
Publication of GB2316713A publication Critical patent/GB2316713A/en
Application granted granted Critical
Publication of GB2316713B publication Critical patent/GB2316713B/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
    • B60R25/01—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
    • 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
    • G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
    • G07C2009/00206—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks the keyless data carrier being hand operated
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
    • G07C2009/00261—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks the keyless data carrier having more than one function
    • G07C2009/00269—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks the keyless data carrier having more than one function opening and locking of all locks at the same time
    • 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
    • G07C2009/00388—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 code verification carried out according to the challenge/response method
    • 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
    • G07C2009/00412—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 the transmitted data signal being encrypted
    • 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
    • G07C2009/00507—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 keyless data carrier having more than one function
    • G07C2009/00531—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 keyless data carrier having more than one function immobilizer
    • 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
    • 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
    • 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
    • G07C9/00857—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys where the code of the data carrier can be programmed

Abstract

A vehicle security system comprises an ignition lock 38 and a key 21 for operating the lock; the key 21 having a first and second actuation 28, 32 means for causing a transmitter 24 to transmit a coded unlock signal; the ignition lock 38 having control means 10 arranged to determine whether the key 21 is in the ignition lock 38 when the signal is sent. If the key 21 is not in the ignition lock 38 the cause of the signal transmission will have been the first actuation means 28, preferably a push button, and the system unlocks at least one door as well as re-mobilising the engine. If the key 21 is in the ignition lock 38 the cause of the signal transmission will have been the second actuation means 32, preferably a coil or reed switch (figure 2), and the system re-mobilises the engine only leaving the state of the door locks in an unchanged condition. The control means 10 determines whether the key is in the ignition lock 38 and thus whether the signal transmission is a result of the first or second actuation means 28, 32 by timing the delay between sending of and receipt of the signal.

Description

VEIC SCTRITY SYSTEM The present invention relates co vehicle security systems, and in particular 0 those including 'passive remobilization' which ensures that the vehicle will not remain immobilized if the driver has entered the vehicle and wants to start it using the proper key.
Passive re-mobilization systems are known, for example from EP 0 521 547. WO 93/02897 discloses a security system in which a transmitter unit has an encoder and a transmitter which can be operated manually to transmit codes from the encoder. The transmitter unit also has electrical contacts through which the code from the encoder can be conducted to co-operating contacts near the vehicle ignition switch to remobilize the vehicle when the key is in the ignition lock.
The first actuation means may be a manual actuation means such as a push-button.
Preferably the second actuation means is actuated by a signal from the control means and the control means is arranged to determine whether the unlock signal was produced by the second actuation means by timing the delay between the sending of said signal and receipt of the unlock signal.
This arrangement is to allow for a situation where the driver has entered the vehicle and locked the doors for his own personal safety, and then starts the vehicle. in this situation the doors are not unlocked again by the system when the transmitter transmits the coded signal to enable the component of the vehicle. However the transmitter will still cause the doors to be unlocked (or locked) when it is used outside the vehicle.
preferred embodiments of the present invention 'nil:i now be described by way of example only witn r-t5rence to the accompanying drawings in which: Figure 1 is a diagrammatic view of a vehicle security system in accordance with a first embodiment of the invention.
Figure 2 is a diagrammatic view or a vehicle security system in accordance with a second embodiment of the invent ion, and Figure 3 is a diagrammatic view of a reed switch in the embodiment of Figure 2.
Referring to Figure 1, in the first embodiment of the invention, a security control unit 10 which is mounted on a vehicle 11 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 a radio frequency (RF) receiver 20 and is arranged to unlock the doors 18 and remobilize the engine 14 upon receipt of a coded RF unlock signal, and to lock the doors and immobilize the engine on receipt of a coded lock signal. An ignition key 21 for the vehicle has an RF transmitter unit 22 attached to it. The transmitter unit 22 comprises an RF transmitter circuit 24 arranged to send cowed RF unlock and lock signals, a power source 26 for the transmitter circuit, and an unlock button 28 for activating the transmitter manually to send the unlock signal by connecting the power supply 26 to the transmitter circuit 24. A lock button (not shown) is also provided to cause the transmitter to send the coded lock signal. The transmitter unit further comprises a transistor 30 and a coil 32 connected so that electromotive force induced in the coil can be used to cause the transistor to connect the power supply to the transmitter circuit 24.
A second coil 34 is connected to the control unit 10 and is housed in a cowl 36 of the vehicle, close to a vehicle ignition lock 38. The control unit 10 is connected to the normal electrical outputs from the ignition lock 38 so that it can sense when the ignition key is present in the ignition lock, and when it is n the auxiliary, ignition and crank positions.
Normally when the driver approaches the vehicle he will re-mobilize the engine 14 and unlock the doors 18 by pressing the unlock button 28. 'however if he has unlocked the doors using the key 21 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 contrcl unit 10 is therefore arranged to detect the situation wnen the engine is immobilized and the key 21 is turned to the auxiliary position in the ignition lock 38.
In this situation te control unit passes an AC current through the coil 34 which induces a current in the coil 32 in the transmitter unit 22. This causes the transistor 30 to connect the power supply 26 to the transmitter circuit 24 which transmits its coded unlock signal. This signal is picked up by the receiver 20 and compared by the control unit 10 to a code stored in memory. If the codes are the same the control u-nit re-mobilizes the engine 14 bi re-enabling the fusel injection system 15, and the driver can start the car in the usual way.
If for security reasons the vehicle user should enter the vehicle and lock the doors 18 mechanically (by depressing the usual locking button cn the door) it is important that the doors do not unlock when the coded unlock signal is transmitted to the control unit 10 as the ignition is switched on. The control unit 10 is therefe programmed to recognize when the coded unlock signal has been sent as a result of use of the key 21 in the ignItion lock 38, and to leave the state of the vehicle door locks unchanged whilst still re-mobilizing the engine. Because the control unit 10 causes the coil 34 to transmit its signal it can determine whether the unlock signal has been produced in response to a signal from the coil 34 simply by timing the delay between sending the signal from the coil 34 and receipt of te unlock signal. If the delay is less than a predetermined t the then the door locks can be left in the locked state. Alternatively the control unit could be ranged to unlock the doors only of the unlock signal was received and the key was not detected in the ignition lock.
When the ignition key 21 is removed from the ignition lock 38, and the ignition is thus disabled, the control unit 10 automatically immobilizes the engine; thereafter the vehicle doors 18 may be locked mechanically or by using the lock button on the transmitter unit 22.
The transmitter circuit 24 inciudes a memory in which a code is stored together with an encryption algorithm which encrypts the code before it is transmitted as a coded signal.
The control unit 10 has a corresponding memory in which the code and the algorithm are also stored. The coded signal is therefore deciphered using the algorithm before it is compared with the code in the memory of the control unit 10. When a transmitter unit needs to be matched to the vehicle, the control unit 10 is made to transmit the encryption algorithm, preceded by an identification code, to the transmitter unit 22 which recognizes the ientification code and stores the following algorithm in its memory. The transmitter unit 22 is then used to transmit a code stored in its memory, using the encryption algorithm, to the control unit 10 five times within five seconds. The control unit recognizes this as an instruction to store the code, after deciphering, in its memory, overwriting any code which is stored there already. In this way a uniquely coded transmitter and a control unit having one of a large number of possible encryption algorithms can be matched p for subsequent use.
It will be appreciated that instead of a whole encryption algorithm, one or more encryption parameters or a part or the whole of the code could be transmitted from the control unit to the transmitter.
Referring to Figure 2, the second embodiment of the invention is similar to the first, and corresponding features are indicated by the same reference numerals preceded by a 1.
In place of the coil 30,a magnetically operated switch means in the form of a reed switch 130 is provided which can activate the transmitter circuit 124 as described below. The reed switch 130 is shown in more detail in Fig. 3 and has two contacts 131, 131a which are made of a flexible magnetic material. The contacts 13i, 131a are supported such that whey normally lie parallel to one another but are spacea a small distance apart.
When the control unit 110 detects the situation when the engine 114 is immobilized and the key 121 is turned to the auxiliary position in the ignition lock 138, the control unit energizes the coil 134 by passing a DC current through it, chereby causing it to become magnetized. The magnetic field produced by the coil 134 s of constant direction and will magnetize the contacts 131, 131a of the reed switch 130, which will be attracted to one another, connecting the power supply ~~ to the transmitter circuit 124.
As a variation on the second embodiment described above with reference to Figures 2 and 3, the coil 134 could be connected to a simple DC power supply via a switch which is operated by turning the key 121 in the ignition lock 138. A positive temperature coefficient (PTC) device or a suitable timing device could also be used to turn off the power to the coil 134 after a predetermined time to ensure that it was only energized for long enough to re-mobilize the engine.

Claims (3)

  1. i. A vehicle security system comprising an ignition lock and a key for operating the lock, a transmitter for transmitting a coded unlock signal, first actuation means for causing the transmitter to transmit the coded unlock signal, second actuation means for causing the transmitter to transmit the coded unlock signal if the key is used in the ignition lock, and control means arranged to determine whether the unlock signal has been produced as a result of use of the key In the ignition lock and to unlock at least one door f the vehicle upon receipt of an unlock signal from the transmitter if said unlock signal is produced by the first actuation means, but not if said unlock signal is produced by the second actuation means.
  2. 2. A system according to claim 1 wherein the second actuation means is actuated by a signal from the control means and the control means is arranged to determine whether the unlock signal was produced by the second actuation means by timing the delay between the sending of said signal and receipt of the unlock signal.
  3. 3. A vehicle security system substantially as described herein with reference to Figure 1 or Figures 2 and 3 of the accompanying drawings.
GB9721304A 1994-02-17 1995-02-16 Vehicle security system Expired - Fee Related GB2316713B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9721304A GB2316713B (en) 1994-02-17 1995-02-16 Vehicle security system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9403005A GB9403005D0 (en) 1994-02-17 1994-02-17 Vehicle immobilizer
GB9407072A GB9407072D0 (en) 1994-04-09 1994-04-09 Vehicle security system
GB9615243A GB2301397B (en) 1994-02-17 1995-02-16 Vehicle security system
GB9721304A GB2316713B (en) 1994-02-17 1995-02-16 Vehicle security system

Publications (3)

Publication Number Publication Date
GB9721304D0 GB9721304D0 (en) 1997-12-10
GB2316713A true GB2316713A (en) 1998-03-04
GB2316713B GB2316713B (en) 1998-07-15

Family

ID=27267053

Family Applications (2)

Application Number Title Priority Date Filing Date
GB9721304A Expired - Fee Related GB2316713B (en) 1994-02-17 1995-02-16 Vehicle security system
GB9615243A Expired - Fee Related GB2301397B (en) 1994-02-17 1995-02-16 Vehicle security system

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB9615243A Expired - Fee Related GB2301397B (en) 1994-02-17 1995-02-16 Vehicle security system

Country Status (1)

Country Link
GB (2) GB2316713B (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2209050A (en) * 1987-08-25 1989-04-26 Honda Motor Co Ltd Anti-theft system for a vehicle
WO1993002897A1 (en) * 1991-07-30 1993-02-18 General Motors-Holden's Automotive Limited Vehicle security system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8320706D0 (en) * 1983-08-01 1983-09-01 Waitrose Ltd Locking devices
DE3406746A1 (en) * 1984-02-24 1985-08-29 Vdo Adolf Schindling Ag, 6000 Frankfurt CONTROL DEVICE
DE3529882A1 (en) * 1985-08-21 1987-02-26 Vdo Schindling SYSTEM FOR LOCKING AND / OR UNLOCKING A SECURITY DEVICE
JPH0747910B2 (en) * 1986-10-24 1995-05-24 日産自動車株式会社 Remote control device
ATE153414T1 (en) * 1991-07-31 1997-06-15 Control Logic Pty Ltd MOTOR VEHICLE FIXING DEVICE WITH PRIORITY CONTROL
DE9314433U1 (en) * 1993-09-23 1994-01-05 Siemens Ag System for contactless data or energy transmission

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2209050A (en) * 1987-08-25 1989-04-26 Honda Motor Co Ltd Anti-theft system for a vehicle
WO1993002897A1 (en) * 1991-07-30 1993-02-18 General Motors-Holden's Automotive Limited Vehicle security system

Also Published As

Publication number Publication date
GB2301397A (en) 1996-12-04
GB9615243D0 (en) 1996-09-04
GB2301397B (en) 1998-07-15
GB9721304D0 (en) 1997-12-10
GB2316713B (en) 1998-07-15

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Legal Events

Date Code Title Description
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: 20050216

Effective date: 20050214