GB2327814A - Remote control alarm using power lead as antenna - Google Patents

Remote control alarm using power lead as antenna Download PDF

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Publication number
GB2327814A
GB2327814A GB9816009A GB9816009A GB2327814A GB 2327814 A GB2327814 A GB 2327814A GB 9816009 A GB9816009 A GB 9816009A GB 9816009 A GB9816009 A GB 9816009A GB 2327814 A GB2327814 A GB 2327814A
Authority
GB
United Kingdom
Prior art keywords
antenna
theft system
receiver unit
control device
power supply
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Withdrawn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
GB9816009A
Other versions
GB9816009D0 (en
Inventor
Reiner Grimm
Oliver Giessl
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of GB9816009D0 publication Critical patent/GB9816009D0/en
Publication of GB2327814A publication Critical patent/GB2327814A/en
Withdrawn legal-status Critical Current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
    • B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B60R16/0315—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for using multiplexing techniques

Abstract

A remote control anti-theft system, preferably for a car, comprises a remote signal device 3, a radio receiver unit 11 and evaluation unit 12 where a power supply line 2 is simultaneously used as the receiving antenna. A high pass filter can be included and can comprise a capacitor which may be a printed conductor structure.

Description

2327814 ANTI-THEFT SYSTEM The invention relates to an anti-theft system,
and in particular to a remotely operable anti-theft system for a motor vehicle.
A remotely operable anti-theft system requires an antenna in order to be able to receive signals of a remote control device. A user locks and unlocks the doors of a motor vehicle having a remotely operable antitheft system fitted in the interior of a motor vehicle with such a remote control device. Frequently a throw-out antenna, that is, a wire antenna, is used as a receiving antenna. This antenna must be connected to the control device of the anti-theft system by means of a special plug and be laid in a cable harness by hand.
An anti-theft device for a motor vehicle is known from German Patent Specification DE 195 37 609 Cl, in which the radio antenna of a car radio, that is present anyway, is used as a receiving antenna. Here as well it is necessary to lay a connecting cable between the antenna or the car radio and the anti-theft device and to connect it to the control device.
it is known, furthermore, that an antenna can be realized on a printedcircuit board that has a printed conductor structure. A comparatively large area is of course used up as a result and this is undesirable in view of the general demand for control devices which are as compact as possible.
The present invention seeks to provide a novel anti-theft system, and in particular a remotely operable anti-theft system for motor vehicles which has a compact control device that can be fitted in a motor vehicle with little outlay in terms of assembly.
According to the present invention, there is provided an anti-theft system which has a control device, having a receiver unit and an evaluating unit is for evaluation of a signal which is received by the receiver unit, and a power supply line which acts as the antenna of the receiver unit.
The invention also relates to a motor vehicle fitted with the anti-theft system of the invention.
Advantageous further developments are set out in the subclaims.
Dispensing with an explicit or separately designed antenna enables the control device to be constructed in a compact manner whilst simultaneously cutting down on a number of steps of operation to fit the anti-theft system to the motor vehicle. It is not necessary to connect a throw-out antenna to the control device nor is it necessary to install said antenna in the motor vehicle.
It is possible to use as an antenna not only a power supply line which is connected to the vehicle frame, but also a power supply line which is connected to an operating voltage.
In a preferred embodiment, a high-pass filter for connection of the power supply line is designed as a printed conductor structure. The high pass filter may advantageously be designed as a comb filter. it is therefore possible to dispense with a discrete component.
For a better understanding of the present invention, and to show how it may be brought into effect, reference will now be made, by way of example, to the accompanying drawings which show a control device of a remotely operable anti-theft system for motor vehicles.
A control device 1 is connected to the power supply of a motor vehicle by way of supply lines 2. one supply line is connected to the vehicle frame and the other supply line is connected to a positive operating voltage. The control device has a receiver is unit 11 which demodulates a received high-frequency signal and transposes it to the baseband.
An antenna input ill of the receiver unit 11 is connected, by way of a capacitor C, to the frame of the control device 1 which, in turn, is connected by way of a supply line 2 to the vehicle frame. The antenna input 111 can be connected to the frame by means of a soldered connection when soldering the control device. A plug for the purpose of connecting an antenna to the control device is not required. Instead of being connected to the frame, the antenna input could also be connected to the positive or negative potential of the power supply.
The capacitor C acts as a high-pass filter and blocks any d.c. component, which might be present, from the antenna input 111.
The receiver unit 11 is connected to the evaluating unit 12. The evaluating unit 12 is realized as a microprocessor.
A user outside the vehicle transmits signals to lock or unlock the vehicle doors by means of a remote control 3. Usual carrier frequencies of the signals are 868 MHz, 433.92 MHz and 315 MHz. The signals are intercepted by the supply lines 2 which are guided in a cable harness to the control device 1. The antenna input ill is supplied with the signal of the remote control by way of a connection with the frame. The capacitor C, which advantageously has a value of between 3 and 20 pf, establishes the connection between the antenna input ill and the frame of the control device 1. The capacitor is realized as a surface mounted device (SMD) and thus, as an inexpensive component which can easily be supplied, is particularly well suited for mass production.
In the receiver unit 11 the high-frequency signal (carrier), which is received, is amplified and subsequently demodulated. A signal, which can be evaluated by the evaluating unit 12 (microprocessor), is output at the output of the receiver unit 11. The signals are sequential digital signals which can also be easily reconstructed by the receiver unit given a low signal-to- noise ratio.
The useful signal thus obtained is transmitted to the evaluating unit 12. If the latter recognizes the signal pattern of the signals received, it initiates actuation of the locking/unlocking mechanism of the vehicle and, if applicable, activates an immobilizer or an alarm system or switches them off. In addition, the evaluating unit 12 can output an audible or visual check-back signal with respect to the locking state, in particular by triggering a horn or an indicator.
By means of the invention it is possible to economize by dispensing with an antenna cable that has an appropriate special plug for insertion at the receiver unit. The system according to the invention functions in a very reliable manner on account of the usually comparatively long supply lines between the control device and the power supply inside the vehicle.
is

Claims (7)

1. An anti-theft system which has a control device, having a receiver unit and an evaluating unit for evaluation of a signal which is received by the receiver unit, and a power supply line which acts as the antenna of the receiver unit.
2. An anti-theft system according to claim 1, wherein the antenna input of the receiver unit and the power supply line are both electrically connected to the housing of the control device.
3. The anti-theft system according to claim 1 or 2, wherein the power supply line is connected to the receiver unit by way of a high-pass filter.
4. An anti-theft system according to claim 3, wherein the high-pass filter is a capacitor.
5. An anti-theft system according to claim 4, wherein the capacitor is formed by means of a printed conductor structure on a printed conductor carrier.
6. An anti-theft system substantially as herein described, with reference to the accompanying drawings.
7. A motor vehicle fitted with an anti-theft system as claimed in any preceding claim.
GB9816009A 1997-07-23 1998-07-22 Remote control alarm using power lead as antenna Withdrawn GB2327814A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1997131736 DE19731736C1 (en) 1997-07-23 1997-07-23 Remote controlled theft protection system for motor vehicle

Publications (2)

Publication Number Publication Date
GB9816009D0 GB9816009D0 (en) 1998-09-23
GB2327814A true GB2327814A (en) 1999-02-03

Family

ID=7836694

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9816009A Withdrawn GB2327814A (en) 1997-07-23 1998-07-22 Remote control alarm using power lead as antenna

Country Status (3)

Country Link
DE (1) DE19731736C1 (en)
FR (1) FR2766440A1 (en)
GB (1) GB2327814A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2389997A (en) * 2002-05-23 2003-12-24 Visteon Global Tech Inc Wireless radio transmission system for vehicle using earth connection as antenna
EP1650879A2 (en) * 2004-10-21 2006-04-26 Seoby Electronics Co., Ltd. Battery modem using short range wireless technology
ITAT20090002A1 (en) * 2009-03-02 2010-09-03 Paser Srl KEEP-ON AIR ELECTRONIC UNIT FOR AUDIO INFORMATION ACQUISITION

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004057515B4 (en) * 2004-11-29 2017-10-12 Tridonic Gmbh & Co Kg Lamp operating device with interface unit for wireless receipt of external control signals
EP2309826A1 (en) * 2009-09-26 2011-04-13 WTS Kereskedelmi és Szolgáltató Kft. Illumination device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB340389A (en) * 1929-12-02 1931-01-01 Gramophone Co Ltd Improvements in or relating to wireless receivers
GB346780A (en) * 1930-01-14 1931-04-14 Lawrence Francis Savage Improvements in and relating to mains-operated wireless receiving apparatus and the like
GB656853A (en) * 1947-05-01 1951-09-05 Philco Corp Antenna systems for radio receivers
GB675096A (en) * 1949-02-14 1952-07-02 Masteradio Ltd Improvements in or relating to wireless aerials
GB2222348A (en) * 1988-08-22 1990-02-28 American Telephone & Telegraph Cordless telephone antenna
WO1995024658A1 (en) * 1994-03-10 1995-09-14 Farnsworth David F Method and apparatus for detecting local precursor seismic activity

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19537609C1 (en) * 1995-10-09 1997-03-13 Siemens Ag Anti-theft device for a motor vehicle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB340389A (en) * 1929-12-02 1931-01-01 Gramophone Co Ltd Improvements in or relating to wireless receivers
GB346780A (en) * 1930-01-14 1931-04-14 Lawrence Francis Savage Improvements in and relating to mains-operated wireless receiving apparatus and the like
GB656853A (en) * 1947-05-01 1951-09-05 Philco Corp Antenna systems for radio receivers
GB675096A (en) * 1949-02-14 1952-07-02 Masteradio Ltd Improvements in or relating to wireless aerials
GB2222348A (en) * 1988-08-22 1990-02-28 American Telephone & Telegraph Cordless telephone antenna
WO1995024658A1 (en) * 1994-03-10 1995-09-14 Farnsworth David F Method and apparatus for detecting local precursor seismic activity

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2389997A (en) * 2002-05-23 2003-12-24 Visteon Global Tech Inc Wireless radio transmission system for vehicle using earth connection as antenna
GB2389997B (en) * 2002-05-23 2004-06-23 Visteon Global Tech Inc Radio data wireless transmission system for an automotive vehicle
US7161471B2 (en) 2002-05-23 2007-01-09 Visteon Global Technologies, Inc. System for an automotive vehicle
EP1650879A2 (en) * 2004-10-21 2006-04-26 Seoby Electronics Co., Ltd. Battery modem using short range wireless technology
EP1650879A3 (en) * 2004-10-21 2011-04-27 Seoby Electronics Co., Ltd. Battery modem using short range wireless technology
ITAT20090002A1 (en) * 2009-03-02 2010-09-03 Paser Srl KEEP-ON AIR ELECTRONIC UNIT FOR AUDIO INFORMATION ACQUISITION

Also Published As

Publication number Publication date
DE19731736C1 (en) 1998-07-23
GB9816009D0 (en) 1998-09-23
FR2766440A1 (en) 1999-01-29

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Legal Events

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