GB2361793A

GB2361793A - Vehicle theft alarm system

Info

Publication number: GB2361793A
Application number: GB0010492A
Authority: GB
Inventors: Dr John I Vukusic
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-04-28
Filing date: 2000-04-28
Publication date: 2001-10-31
Also published as: GB0010492D0

Abstract

The system comprises of two units: an alert emitter unit and an alert receiver unit Whenever an attempt is made to enter the vehicle, the alert emitter unit, incorporated with standard car alarm system, alerts the holder of the alert receiver unit that such an attempt is taking place. The alert emitter unit activates the alert receiver unit, by sending a radio frequency signal (for example at 446MHz band) to the alert receiver unit, even to places where the sound from the standard car alarm would not be heard, such as buildings, shopping centres, offices etc. at a distance of up to a few kilometres.

Description

2361793 Car alerter for superior vehicle securitv This invention relates

to a one way radio frequency link between the vehicle and its key (key holder) for the improved security. The car alerter is incorporated into a standard car alarm system and consists of two units, one unit being located in the vehicle incorporated with the standard car alarm system and the other unit being in possession by the vehicle key holder or integrated with the key itself The standard car alarm systems alert anybody within the distance that the car alarm sound is audible, it is inefective if the owner (or the key holder) is at the distance beyond the audible distance from the vehicle.

The car alerter consists of two units: The alert emitter unit and the alert receiver unit The alert emitter unit is located inside the vehicle and appropriately connected to the car alarm system or installed as an independent unit. It transmits a radio frequency signal when the car alarm is triggered (when the car alarm goes oft) or when an attempt is being made to enter the vehicle.

The alert receiver unit receives and detects the emitted signal and audibly (or by any other means) alerts the holder of the receiver unit that his or her vehicle alarm has been triggered or that an attempt has been made to enter the vehicle. The alert receiver unit could be a part of the vehicle key or detached from it as a separate unit.

In order to have many channels within the allocated frequency band, or bands, a narrow frequency spectrum is used to appropriately modulate the carrier ftequency of the alert emitter unit.

Using the car alerter incorporated with the car alarm, the vehicle owner (the key holder) is alerted if the attempt is being made to enter the vehicle, even if the owner (key holder or receiver unit holder) is at the distance beyond the reach of the sound produced by the vehicle standard alarm system. The receiver unit holder is alerted at the distance of up to a few kilometres or even when inside a building (offices, shopping centres, restaurants etc.). Besides being a greatly improved security system for the vehicle, it could reduce the duration of the alarm being active contributing to the already high noise pollution.

Each pair of alert emitter/alert receiver is programmed to a predetermined, coded, radio signals so that one alert emitter unit activates only one alert receiver unit. The alert emitter unit could be connected to the car battery and the alert receiver unit has a rechargeable battery fitted and the facility for the battery to be recharged. The ignition key or the car door key could act as the receiving antenna when part of the alert receiver unit. The car alerter contribution towards the reduction in car crime has a potential to be very beneficial.

A specific embodiment ofthe invention of alert receiver unit is described in accompanying drawing. Fig 1 shows the alert receiver unit incorporated with the car ignition key (car door key) where 1 the metal part of the above key system acts as the alert receiver unit's antenna and 2 is the electronic circuit of the alert receiver unit.

Q

Claims

I. A one way radio frequency link is claimed between the alert emitter unit situated in the vehicle and the vehicle key incorporating the alert receiver unit where the signals are sent from the alert emitter unit in the vehicle to the alert receiver unit incorporated with the vehicle key, or as a separate unit, when the alert emitter unit is activated.
2. A link as claimed in Claim 1 where the RF signal is enfitted to alert the vehicle key holder of a possible break into his or her vehicle.
3. A link claimed in Claim 1 and Claim 2 where the vehicle key serves as the antenna of the alert receiver unit
4. A link as claimed in any of the above Claims where an RF signal, when emitted by the alert emitter unit is of a narrow frequency spectrum and coded in such a way that only the corresponding alert receiver unit is activated.
5. A link claimed in the above Claims where the key holder is alerted of a possible unauthorized entry into his or her vehicle even when the key holder is at the distance from the vehicle beyond the audible distance of the vehicle standard car alarm system.