GB2141779A - Vehicle security system - Google Patents

Vehicle security system Download PDF

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Publication number
GB2141779A
GB2141779A GB8304808A GB8304808A GB2141779A GB 2141779 A GB2141779 A GB 2141779A GB 8304808 A GB8304808 A GB 8304808A GB 8304808 A GB8304808 A GB 8304808A GB 2141779 A GB2141779 A GB 2141779A
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GB
United Kingdom
Prior art keywords
vehicle
ignition
bonnet
switch
lock mechanism
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB8304808A
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GB8304808D0 (en
Inventor
Malcolm John Hay
Richard Charles Broadhurst
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Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB8304808A priority Critical patent/GB2141779A/en
Publication of GB8304808D0 publication Critical patent/GB8304808D0/en
Publication of GB2141779A publication Critical patent/GB2141779A/en
Withdrawn legal-status Critical Current

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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
    • B60R25/01—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens
    • B60R25/04—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on the propulsion system, e.g. engine or drive motor
    • B60R25/045—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on the propulsion system, e.g. engine or drive motor by limiting or cutting the electrical supply to the propulsion unit

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

Abstract

A tamper-proof encoded vehicle security system comprises an electromechanical lock mechanism 6 for securing the vehicle engine compartment lid and an additional switch 5 incorporated in the vehicle ignition circuit in order to inhibit normal ignition circuit operation. Normally the engine compartment lid is locked by lock mechanism 6 and the additional switch 5 is set to inhibit ignition circuit operation and this state can only be changed by a security device. The security device may comprise a keypad for inputting the required code via an input device 2 or more sophisticated devices such as a code reader which reads a code from a magnetic card. The system is tamper-proof since the control unit 1 which drives the electromechanical lock mechanism 6 and the additional switch 5 is itself located in the secured vehicle engine compartment. <IMAGE>

Description

SPECIFICATION Vehicle security system Conventional security circuits for vehicle ignition systems suffer from the drawbackthat it is possible for a thief to nullify the effect of the security circuit.
This may be achieved either by short-circuiting some part of the security circuit/ignition system from within the vehicle passenger compartment or as a resu It of the thief gaining access to the security circuit or ignition system or both via the vehicle engine compartment.
The present invention has the object of providing a security system which is tamper-proof because it is not possible to override the security system from within the vehicle passenger compartment and it prevents access to the vehicle engine compartment.
This makes the vehicle ignition system tamper-proof since it is interlocked with the security system.
Hereafter the word "bonnet" refers to the vehicle engine compartment lid. According to this invention there is provided a tamper-proof encoded vehicle security system comprising a conventional ignition switch and a code input device located in the vehicle passenger compartment plus an electromechanical bonnet lock mechanism, a switch to disable the ignition circuit and an electronic control unit located in the vehicle engine compartment. The code input device may comprise a conventional keypad but more sophisticated input devices include a coded magnetic card and card reader. The electromechanical bonnet lock mechanism is in addition to the conventional vehicle bonnet lock.
The invention will now be described in more detail with reference to the accompanying drawings in which: Figure 1 is a block diagram of the security system with particular reference to the location of the various system elements.
Figure 2 is a block diagram of the electronic control unit.
Figure 3 illustrates a typical connection for the interface between the security system and the vehicle ignition circuit.
Figure 4 is a section through a typical electromechanical bonnet lock mechanism.
With reference to Figure 1 an electronic control unit 1 located in the vehicle engine compartment receives signals from a code input device 2 located in the vehicle passenger compartment. The control unit 1 is powered by the vehicle battery 4 and is enabled by the conventional vehicle ignition switch 3. The control unit 1 generates outputs to drive a switch 5 to disable the ignition circuit and an electromechanical bonnet lock mechanism 6 which is in addition to the conventional bonnet lock 25. A bonnet microswitch 7 indicates to the control unit 1 the actual position of the bonnet.
With reference to Figure 2 the electronic control unit consists of a sequence detection unit 11 which receives inputs from a code setting device 10 and the vehicle ignition switch 3 plus an optional "save" button 16 and an optional "lock" button 17. Signals from the code input device 2 are routed as required by the code setting device 10 into the sequence detection unit 11 which generates an output upon receipt of the correct input signal sequence when enabled by the ignition switch 3. This output is used by the drive units 12 and 13to control the electromechanical bonnet lock mechanism. Afurther input from the bonnet microswitch 7 prevents the bonnet lock mechanism from entering the "locked" state whilst the bonnet is open in order to avoid damage to the mechanism during vehicle maintenance.The output from the sequence detection unit 11 also controls a switch 5 to disable the ignition circuit. This switch can comprise a relay, a triac, SCR or any suitable semiconductor switch.
The optional "lock" and "save" buttons may be used, if required, to override the effect of the security system.
Figure 3 illustrates a typical electrical circuit for a vehicle ignition system apart from the additional switch 5 which is opened and closed by signals from the electronic control unit. The low voltage side of the conventional ignition system comprises the vehicle battery 4 connected to the ignition switch 3 and then via the coil low voltage winding 21 to the contact breaker points 24. The condenser 23 is connected, as shown, between one side of the contact breaker points and the vehicle ground. The high voltage side of the ignition system comprises the coil high voltage winding 22 connected (often via a distributor) to the spark plug 20.
With reference to Figure 3 the additional switch 5 is connected between the vehicle ignition switch 3 and the coil low voltage winding 21. With the additional switch 5 in the open position the electical circuit from the vehicle battery 4 to the condenser 23 cannot be completed thereby inhibiting normal ignition circuit operation.
Although the conventional firing system for an internal combustion engine has been shown with mechanical contacts 24, the invention can clearly be applied to other ignition systems, including electronic systems.
Figure 4 illustrates a typical electromechanical bonnet lock mechanism comprising a central locking bolt 35 located within two opposing solenoids, 36 & BR< 40. The locking bolt 35 is moved between the end-stops 42, 45 of the solenoids by electrical signals applied to the solenoids 36,40. The locking bolt 35 is held at the extremes of its travel by a spring-loaded ball 39 located in one of the two grooves in the bolt 35.
In Figure 4 the lock mechanism is shown in the unlocked position. To lock the bonnet the locking bolt 35 is moved to the other extreme of its travel and thus the end of the bolt 35 passes through the bracket 43 which is attached to the bonnet. Additional support for the bolt 35 may be provided by a plate 44 secured within the engine compartment.
1. A vehicle security system capable of disabling the vehicle ignition circuit by an additional switch connected in the circuit, and securing the vehicle engine compartment by an electromechanical lock
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Vehicle security system Conventional security circuits for vehicle ignition systems suffer from the drawbackthat it is possible for a thief to nullify the effect of the security circuit. This may be achieved either by short-circuiting some part of the security circuit/ignition system from within the vehicle passenger compartment or as a resu It of the thief gaining access to the security circuit or ignition system or both via the vehicle engine compartment. The present invention has the object of providing a security system which is tamper-proof because it is not possible to override the security system from within the vehicle passenger compartment and it prevents access to the vehicle engine compartment. This makes the vehicle ignition system tamper-proof since it is interlocked with the security system. Hereafter the word "bonnet" refers to the vehicle engine compartment lid. According to this invention there is provided a tamper-proof encoded vehicle security system comprising a conventional ignition switch and a code input device located in the vehicle passenger compartment plus an electromechanical bonnet lock mechanism, a switch to disable the ignition circuit and an electronic control unit located in the vehicle engine compartment. The code input device may comprise a conventional keypad but more sophisticated input devices include a coded magnetic card and card reader. The electromechanical bonnet lock mechanism is in addition to the conventional vehicle bonnet lock. The invention will now be described in more detail with reference to the accompanying drawings in which: Figure 1 is a block diagram of the security system with particular reference to the location of the various system elements. Figure 2 is a block diagram of the electronic control unit. Figure 3 illustrates a typical connection for the interface between the security system and the vehicle ignition circuit. Figure 4 is a section through a typical electromechanical bonnet lock mechanism. With reference to Figure 1 an electronic control unit 1 located in the vehicle engine compartment receives signals from a code input device 2 located in the vehicle passenger compartment. The control unit 1 is powered by the vehicle battery 4 and is enabled by the conventional vehicle ignition switch 3. The control unit 1 generates outputs to drive a switch 5 to disable the ignition circuit and an electromechanical bonnet lock mechanism 6 which is in addition to the conventional bonnet lock 25. A bonnet microswitch 7 indicates to the control unit 1 the actual position of the bonnet. With reference to Figure 2 the electronic control unit consists of a sequence detection unit 11 which receives inputs from a code setting device 10 and the vehicle ignition switch 3 plus an optional "save" button 16 and an optional "lock" button 17. Signals from the code input device 2 are routed as required by the code setting device 10 into the sequence detection unit 11 which generates an output upon receipt of the correct input signal sequence when enabled by the ignition switch 3. This output is used by the drive units 12 and 13to control the electromechanical bonnet lock mechanism. Afurther input from the bonnet microswitch 7 prevents the bonnet lock mechanism from entering the "locked" state whilst the bonnet is open in order to avoid damage to the mechanism during vehicle maintenance.The output from the sequence detection unit 11 also controls a switch 5 to disable the ignition circuit. This switch can comprise a relay, a triac, SCR or any suitable semiconductor switch. The optional "lock" and "save" buttons may be used, if required, to override the effect of the security system. Figure 3 illustrates a typical electrical circuit for a vehicle ignition system apart from the additional switch 5 which is opened and closed by signals from the electronic control unit. The low voltage side of the conventional ignition system comprises the vehicle battery 4 connected to the ignition switch 3 and then via the coil low voltage winding 21 to the contact breaker points 24. The condenser 23 is connected, as shown, between one side of the contact breaker points and the vehicle ground. The high voltage side of the ignition system comprises the coil high voltage winding 22 connected (often via a distributor) to the spark plug 20. With reference to Figure 3 the additional switch 5 is connected between the vehicle ignition switch 3 and the coil low voltage winding 21. With the additional switch 5 in the open position the electical circuit from the vehicle battery 4 to the condenser 23 cannot be completed thereby inhibiting normal ignition circuit operation. Although the conventional firing system for an internal combustion engine has been shown with mechanical contacts 24, the invention can clearly be applied to other ignition systems, including electronic systems. Figure 4 illustrates a typical electromechanical bonnet lock mechanism comprising a central locking bolt 35 located within two opposing solenoids, 36 & BR< 40. The locking bolt 35 is moved between the end-stops 42, 45 of the solenoids by electrical signals applied to the solenoids 36,40. The locking bolt 35 is held at the extremes of its travel by a spring-loaded ball 39 located in one of the two grooves in the bolt 35. In Figure 4 the lock mechanism is shown in the unlocked position. To lock the bonnet the locking bolt 35 is moved to the other extreme of its travel and thus the end of the bolt 35 passes through the bracket 43 which is attached to the bonnet. Additional support for the bolt 35 may be provided by a plate 44 secured within the engine compartment. CLAIMS
1. A vehicle security system capable of disabling the vehicle ignition circuit by an additional switch connected in the circuit, and securing the vehicle engine compartment by an electromechanical lock mechanism wherein the means for controlling the additional switch and lock mechanism is located in the vehicle engine compartment.
2. A system as claimed in claim 1 comprising a magnetic card reader which forms part of the security device, the ignition circuit being enabled and the engine compartment unlocked only when a magnetic card with a predetermined code is inserted into the card reader.
3. A system as claimed in claim 1 comprising a comparator and means for inputting a code into the said comparator, the ignition circuit being enabled and the engine compartment unlocked when the comparator senses the identity of the input code with a predetermined code.
4. A system as claimed in claim 3 wherein the inputting means comprises a keyboard or touch sensitive keypad.
GB8304808A 1983-02-22 1983-02-22 Vehicle security system Withdrawn GB2141779A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8304808A GB2141779A (en) 1983-02-22 1983-02-22 Vehicle security system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8304808A GB2141779A (en) 1983-02-22 1983-02-22 Vehicle security system

Publications (2)

Publication Number Publication Date
GB8304808D0 GB8304808D0 (en) 1983-03-23
GB2141779A true GB2141779A (en) 1985-01-03

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Family Applications (1)

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GB8304808A Withdrawn GB2141779A (en) 1983-02-22 1983-02-22 Vehicle security system

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GB (1) GB2141779A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988006110A1 (en) * 1987-02-20 1988-08-25 Failproof Anti-Theft Systems Pty. Ltd. Anti-theft vehicle system
US5128649A (en) * 1991-07-08 1992-07-07 Chao-Yean Chang Motor vehicle alarm
GB2262074A (en) * 1991-11-26 1993-06-09 Frederick William Latimer Motor vehicle security systems
EP0614791A1 (en) * 1993-03-09 1994-09-14 Thomson-Csf Antitheft device for motor vehicle
FR2702434A1 (en) * 1993-03-09 1994-09-16 Thomson Csf Antitheft device for motor car
FR2702435A1 (en) * 1993-03-09 1994-09-16 Thomson Csf Theft deterrent device for motor cars
DE4326089C2 (en) * 1993-08-05 2003-11-20 Siemens Ag Anti-theft device for a motor vehicle
GB2461760A (en) * 2008-07-16 2010-01-20 Jungheinrich Ag Floor conveyor and separate working means for operating the floor conveyor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB231645A (en) * 1924-03-05 1925-04-09 John Edward Waller Improvements in or connected with means for preventing the unauthorised use of motor vehicles
GB740168A (en) * 1953-03-24 1955-11-09 Britonic Products Ltd Improvements in and relating to means for securing a motor vehicle against theft
GB1251081A (en) * 1968-03-19 1971-10-27
US3634880A (en) * 1970-05-20 1972-01-11 Popular Science Publishing Co Automobile antitheft apparatus
GB2023897A (en) * 1977-09-22 1980-01-03 Licentia Gmbh Security systems

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB231645A (en) * 1924-03-05 1925-04-09 John Edward Waller Improvements in or connected with means for preventing the unauthorised use of motor vehicles
GB740168A (en) * 1953-03-24 1955-11-09 Britonic Products Ltd Improvements in and relating to means for securing a motor vehicle against theft
GB1251081A (en) * 1968-03-19 1971-10-27
US3634880A (en) * 1970-05-20 1972-01-11 Popular Science Publishing Co Automobile antitheft apparatus
GB2023897A (en) * 1977-09-22 1980-01-03 Licentia Gmbh Security systems

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988006110A1 (en) * 1987-02-20 1988-08-25 Failproof Anti-Theft Systems Pty. Ltd. Anti-theft vehicle system
US5128649A (en) * 1991-07-08 1992-07-07 Chao-Yean Chang Motor vehicle alarm
GB2262074A (en) * 1991-11-26 1993-06-09 Frederick William Latimer Motor vehicle security systems
GB2262074B (en) * 1991-11-26 1995-08-16 Frederick William Latimer Motor vehicle security systems
EP0614791A1 (en) * 1993-03-09 1994-09-14 Thomson-Csf Antitheft device for motor vehicle
FR2702434A1 (en) * 1993-03-09 1994-09-16 Thomson Csf Antitheft device for motor car
FR2702435A1 (en) * 1993-03-09 1994-09-16 Thomson Csf Theft deterrent device for motor cars
DE4326089C2 (en) * 1993-08-05 2003-11-20 Siemens Ag Anti-theft device for a motor vehicle
GB2461760A (en) * 2008-07-16 2010-01-20 Jungheinrich Ag Floor conveyor and separate working means for operating the floor conveyor
GB2474802A (en) * 2008-07-16 2011-04-27 Jungheinrich Ag Floor conveyor and separate working means for operating the floor conveyor
GB2461760B (en) * 2008-07-16 2011-09-28 Jungheinrich Ag Floor conveyor and separate working means for operating the floor conveyor
GB2474802B (en) * 2008-07-16 2011-11-23 Jungheinrich Ag Floor conveyor and separate working means for operating the floor conveyor

Also Published As

Publication number Publication date
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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)