GB2388870A

GB2388870A - Telephone activated vehicle immobiliser

Info

Publication number: GB2388870A
Application number: GB0211585A
Authority: GB
Inventors: Mark Harwood
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-05-21
Filing date: 2002-05-21
Publication date: 2003-11-26
Anticipated expiration: 2022-05-21
Also published as: GB2388870B; GB0211585D0

Abstract

A vehicle immobiliser circuit which cuts electrical power to either the vehicle's computer, coil, starter or fuel pump (or a combination of two or more of these parts) when the circuit is activated on receipt of a signal transmitted from a telephone to a receiver mounted in the vehicle. The receiver F is supplied with electrical power from the vehicle battery via a voltage stepdown transformer G, which reduces the voltage from the standard 12 volts DC to 6 volts DC which is suitable for the receiver. When a signal is received by the receiver F, power is supplied to a reed relay E causing its activation which, in turn, activates switches in the circuit to cut power supply to one or more key electrical components. The vehicle is rendered inoperable until a further call is transmitted from a telephone to the receiver, which restores the power supply to the disabled parts. Whilst cutting power to one or more key electrical components, the circuit may operate to supply power to an audible siren.

Description

TELEPHONE ACTIVATED VEHICLE IMMOBILISER

DESCRIPTION of OPERATION

I 2 Wires supply the unit with 1 2v DC from vehicle battery. (positive and negative) 2. 12v DC is then supplied to a small step down transformer (voltage reducer) 3. Outlet voltage now is 6v DC 500rna (approx) which is then supplied to switch D4 and Reed Relay (E). (D4switch supplying telephone receiver) 4. Trigger (I) is set manually towards switches C3 and D4 using thumb wheel (L). Unit is now ready for use.

5. When unit (F) receives call/signal from any outside line using the telephone number issued to that unit, voltage normally supplying ring tone speaker now supplies Reed relay (E) thus activating relay and allowing 6v DC to run through wire la to switches Al and B2 then to motor (H).

6. Tngger (I) is now sent to position P2, at the same time deactivating switch C3 (voltage supply to either vehicle computer, coil, starter, fuel pump or all four) while momentarily cutting supply to unit (F) which resets itself re-opening Reed relay (E) and stopping supply voltage to motor (H) via switches A I and B2.

7. Trigger (1) is now stopped at position 2 (P2) making switches Al and B2 reverse voltage to motor (H) ready to send trigger (1) back to position I on next call/signal re-supplying voltage to switch C3. 8. Switch C3 also has outlet for optional siren, activated simultaneously.

KEY Al REVERSE VOLTAGE SWITCH B2 REVERSE VOLTAGE SWITCH

C3 CIRCUIT BREAKER SWITCH

D4 MOMENTARY VOLTAGE BREAK AND

RESET SWITCH TO UNIT F

E REED RELAY

TELEPHONE RECEIVER UNIT

G STEPDOWN TRANSFORMER

_. H DC MOTOR

I TRIGGER

J WORM DRIVE

K STEPDOWN GEARS

L THUMB WHEEL FOR INITIAL SET-UP

1 a Cable lb, lc Speaker ring tone cable

Claims

Telephone Activated Vehicle Immobiliser 1. A telephone activated vehicle immobiliser having 12 volts DC power supply from the vehicle battery by means of two wires, one positive and one negative. Power supply is reduced to 6 volts DC by means of a transformer. The 6 volt DC outlet voltage supplies power to a switch and relay The switch powers a telephone receiver.At set up a trigger is manually set using a thumb wheel.The immobiliser is activated when the telephone receiver receives a call/signal from an outside source using it's dedicated telephone number. Voltage normally supplying the ring tone now supplies power to a reed relay which allows power to flow to the switches and motor.The motor once activated moves the trigger to deactivate a switch which contrails power supply to either the vehicles' computer,coil,starter,fuel pump or all four,which will effectively cause the vehicle to cut out and stop and render the vehicle innoperable untill the unit is reset.The next call/signal received by the telephone receiver has a reversing effect due to the position of the trigger which makes switches reverse voltage to the motor and send trigger back to its previous position and resupplying voltage to the switch that supplies the power to the vehicles computer, coii starter,fuel pump or all four which will now allow the vehicle to be restarted.
2. A telephone activated vehicle immobiliser as claimed in Claim 1, wherein the switch that cuts the

power supply to the vehicle simultaneousely supplies power for use on auxiliary devices.

f Amendments to the claims have been filed as follows CLAIMS

Telephone Activated Vehicle Immobiliser 1. A telephone activated vehicle immobiliser werein 12 volts DC power is supplied from the vehicles battery by means of two wires, one positive and one negative, the voltage is then reduced and regulated by voltage converter it is then fed to a telephone receiver via a power interupt switch and also a reed relay (normally open type) were the output terminal is connected to two reverse polarity switches which supply power, when activated, to a miniature DC motor coupled to a miniature gearing system which drives a wormdrive shah on which an activating lever is fitted,the immobiliser is activated when the telephone receiver receives a call/signal from an outside source using its dedicated telephone number, the activated telephone receiver sends voltage from the ring tone circuit to reed relay coil terminals thus activating reed relay and allowing voltage from converter to energise DC motor via reverse polarity switches and so driving actuating lever from a primary position to a secondary position deactivating a switch supplying voltage to the vehicles ignition system,fuel system or both via vehicles management system, at the same instantof moving from primary position to secondary position, the actuating lever momentarily cuts power to telephone receiver via power interrupt switch, causing receiver unit to reset and so deactivating reed relay stopping voltage to DC motor via reverse polarity switches which now stops actuating lever at secondary position,whereupon at the same time voltage to DC motor has been reversed, it cannot be affective because voltage to reverse polarity switches has now benn stopped via the deactivated reed relay, the vehicle now cuts out and stops,rendering it inoperable until the immobiliser receives next call/signal whereupon the whole procedure is repeated, sending the actuating lever back to the primary position resupplying voltage to the switch that supplies power to the vehicles ignition system, fuel system or both via management system which will now allow the vehicle to be restarted,the switch that cuts the power to the vehicle can simultaneously supply power for use in accompanying anti-theft devices such as activating tracker systems.