WO2000020712A1 - Systeme d'acces a distance sans cle a canaux multiples - Google Patents

Systeme d'acces a distance sans cle a canaux multiples Download PDF

Info

Publication number
WO2000020712A1
WO2000020712A1 PCT/US1999/021650 US9921650W WO0020712A1 WO 2000020712 A1 WO2000020712 A1 WO 2000020712A1 US 9921650 W US9921650 W US 9921650W WO 0020712 A1 WO0020712 A1 WO 0020712A1
Authority
WO
WIPO (PCT)
Prior art keywords
frequencies
signal
frequency
noise
mhz
Prior art date
Application number
PCT/US1999/021650
Other languages
English (en)
Inventor
Qingfeng Tang
Ronald Ogra King
Original Assignee
Lear Automotive Dearborn, Inc.
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 Lear Automotive Dearborn, Inc. filed Critical Lear Automotive Dearborn, Inc.
Publication of WO2000020712A1 publication Critical patent/WO2000020712A1/fr

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
    • 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
    • B60R25/2072—Means to switch the anti-theft system on or off with means for preventing jamming or interference of a remote switch control signal
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/12—Frequency diversity
    • 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
    • G07C2009/00793—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 by Hertzian waves
    • 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
    • G07C2209/00—Indexing scheme relating to groups G07C9/00 - G07C9/38
    • G07C2209/60—Indexing scheme relating to groups G07C9/00174 - G07C9/00944
    • G07C2209/61—Signal comprising different frequencies, e.g. frequency hopping

Definitions

  • This invention generally relates to remote keyless entry systems and, more particularly, to remote keyless entry systems utilizing multiple frequencies for transmitting signals.
  • remote keyless entry systems are available as options on many vehicles. With the increased popularity of remote keyless entry systems, a variety of problems and design challenges have arisen.
  • One such problem is to design a system that operates at a low enough power so that components can be used for the system that keep the costs of the system low.
  • the low power systems typically have a relatively limited frequency range. With the increasing popularity of such systems, the frequency range available for low power systems has become crowded which can lead to difficulty in having effective communication between a remote transmitting device and the controller operating the keyless entry system.
  • This invention provides a system and method that overcomes the shortcomings and drawbacks associated with prior systems while solving the problems discussed above.
  • this invention is a system for controlling a security device, such as a remote keyless entry system, that transmits a signal over a plurality of frequencies.
  • a remote signal transmitter transmits a signal containing information that will be processed by a signal processor portion of a receiver.
  • the information within the transmitted signal causes a desired operation of the security system.
  • the transmitter transmits the signal information at a plurality of frequencies.
  • the receiver includes a detector portion that detects an amount of noise at each of a plurality of frequencies.
  • a selector portion selects the frequency with the least amount of noise. The selected frequency is the frequency of the transmitted signal used by the receiver.
  • a wireless system for controlling operation of a security device having a remote signal transmitter arranged to transmit a signal containing control information at a plurality of frequencies, and a receiver comprising a detector portion arranged to detect an amount of noise at each of the plurality of frequencies, a selector portion responsive to the detector portion for selecting the frequency experiencing the least amount of noise, and a signal processor arranged to process the signal received by the receiver at the selected frequency.
  • the processor is further arranged to cause operation of the security device based on the processed signal.
  • a method for wirelessly controlling a security system that includes selecting a plurality of frequencies, detecting an amount of noise at each of the selected frequencies, and determining which of the frequencies has a smallest amount of noise.
  • a receiving frequency is defined as the frequency with the smallest amount of noise.
  • a signal is transmitted at each of the selected frequencies, and received at the receiving frequency.
  • FIGURE 1 is a diagrammatic illustration of a system designed according to this invention.
  • FIGURE 2 is a schematic illustration of a signal transmission designed according to this invention.
  • FIGURE 3 is a schematic illustration of a system designed according to this invention.
  • FIG. 1 illustrates a security system 20.
  • the security system 20 is a remote keyless entry system.
  • a remote signal transmitter 22 preferably is supported on a key fob 24 in a conventional manner.
  • the key fob preferably is similar to well-known key fobs utilized with one or more conventional keys 26, such as used to operate the ignition of a vehicle.
  • the illustrated key fob 24 includes two switches 28 and 30.
  • the switch 28 preferably is usedio signal a desire to unlock the keyless entry system while the switch 30 preferably is utilized to generate a signal indicating a desire to lock the keyless entry system.
  • the signal from the remote transmitter 22 is communicated to a receiver 34 of the remote keyless entry system on the vehicle 36.
  • the communication between the remote transmitter 22 and the remote keyless entry system receiver 34 is wireless and preferably utilizes radio frequency communication signals.
  • Figure 2 schematically illustrates a signal 40 generated by the remote signal transmitter 22.
  • the signal 40 includes information indicating the desire of the user of the system. For example, if switch 28 were activated, that indicates a desire to unlock the keyless entry system on the vehicle 36. Accordingly, the signal 40 includes information that would be interpreted by the keyless entry system to effect the desired operation of the system locks.
  • the same information is transmitted by the transmitter 22 at a plurality of frequencies.
  • the signal 40 includes five different frequencies 42, 44, 46, 48 and 50, respectively. Each of these frequencies includes the same information indicating the desired operation of the system. Each of the frequencies, however, are distinct from the others. While five frequencies are illustrated in Figure 2, it is within the scope of this invention to utilize two frequencies or any number greater than two.
  • An alternative embodiment includes transmitting the signal information at each frequency separately in a rapid successive pattern. This example still only requires a single switch 28, 30 activation and provides automatic transmission at multiple frequencies. For example, three separate transmissions may occur within a one second time period.
  • the preferred range of the frequencies for the signal 40 extends from approximately 260 MHZ to about 470 MHZ. This range is suitable for low power radio frequency communication.
  • a first frequency preferably is within a lower portion of the range from about 260 MHZ to about 330 MHZ.
  • a second frequency preferably is selected from within a central portion of the range from about 330 MHZ to about 400 MHZ.
  • a third frequency is selected from within an upper portion of the range from about 400 MHZ to about 470 MHZ.
  • the remote signal transmitter 22 preferably includes a sequence control unit 60 that is responsible for determining what signal will be generated and transmitted.
  • the sequence control unit 60 preferably includes the ability to encrypt the information within the signal that is transmitted for security purposes.
  • the sequence control unit 60 preferably also controls whether the plurality of frequencies are used simultaneously or in a successive pattern within a selected time period.
  • a data generator 62 generates the information within the signal that is interpreted by the system 34 to effect the desired operation.
  • a multiple frequency generator 64 provides the plurality of frequencies at which the information from the data generator 62 will be transmitted.
  • the information of the signal is transmitted over the plurality of frequencies by a conventional antenna 66.
  • the plurality of frequencies from the multiple frequency generator 64 preferably are preselected and set or programmed into the transmitter 22 so that only a selected number of frequencies are utilized.
  • the transmitter can be implemented by using a frequency programmable oscillator, a frequency synthesizer, or an integrated saw with a varactor diode.
  • the specific components utilized may vary depending on the needs of a particular situation.
  • the remote keyless entry system receiver 34 includes an antenna 70 that captures the signal transmitted by the remote transmitter 22.
  • a selector portion 72 awaits the signal from the transmitter 22 at a selected frequency. The selected frequency is determined utilizing a detector portion 74 that monitors or detects the amount of noise at each of a plurality of frequencies .
  • the detector 74 is programmed to operate so that it only monitors a preselected plurality of frequencies. These frequencies preferably are preselected to correspond directly to the frequencies that are utilized by the remote signal transmitter 22.
  • the selector portion 72 selects the frequency at which there is the least amount of noise. This ensures accurate and unhindered communication between the remote transmitter 22 and the receiver 34.
  • a multiple band receiver portion 76 is in communication with the selector 72 so that the signal captured by the antenna 70 is communicated to the receiver portion 76.
  • the information from the received signal preferably is amplified using a conventional amplifier 78 and then communicated to a system controller 80, which is responsible for locking or unlocking the system according to the information within the transmitted signal.
  • the multiple band receiver can be implemented using a frequency adjustable superregenerating receiver or other available frequency controllable receivers.
  • the specific components chosen may vary depending on the needs of a particular situation.
  • the method of operating a system designed according to this invention includes several basic steps.
  • a plurality of distinct frequencies preferably are preselected for use in communicating the remotely generated signal to the system controller.
  • the system controller then monitors each of the preselected frequencies to determine the amount of noise at each frequency.
  • the frequency having the least amount of noise is selected as the receiving frequency.
  • the frequency having the least amount of noise is utilized to ensure unhindered and accurate communication. Once the signal is received it is then processed to effect the desired operation of the system.
  • a system and method designed according to this invention provides significant advantages compared to other systems.
  • a system designed according to this invention is immune from narrow band noise that would otherwise compromise communication and the performance of the system. Additionally, the system performance is enhanced because there is an improvement in the range of communication so that the transmitter may be further from the receiver than in conventional systems even when low power components are utilized. Moreover, the advantages of this invention can be realized even when using relatively low cost components, which provides significant economic advantages.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Selective Calling Equipment (AREA)
  • Lock And Its Accessories (AREA)

Abstract

L'invention concerne un système d'accès à distance sans clé comprenant un émetteur (22) distant qui émet un signal (40) d'information sur une pluralité de fréquences (42-50). Un récepteur (34) comprend une partie (74) détecteur qui détecte le niveau de bruit pour chacune des fréquences utilisées par l'émetteur. Une partie (72) sélecteur sélectionne la fréquence présentant le niveau de bruit le plus bas. Une partie (76) récepteur reçoit signal émis à distance à la fréquence sélectionnée. Le signal reçu est traité de manière à produire le fonctionnement désiré du système. Le signal peut être émis simultanément à chacune des fréquences.
PCT/US1999/021650 1998-10-05 1999-09-21 Systeme d'acces a distance sans cle a canaux multiples WO2000020712A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16662798A 1998-10-05 1998-10-05
US09/166,627 1998-10-05

Publications (1)

Publication Number Publication Date
WO2000020712A1 true WO2000020712A1 (fr) 2000-04-13

Family

ID=22604073

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/021650 WO2000020712A1 (fr) 1998-10-05 1999-09-21 Systeme d'acces a distance sans cle a canaux multiples

Country Status (1)

Country Link
WO (1) WO2000020712A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000074268A1 (fr) * 1999-05-26 2000-12-07 Siemens Aktiengesellschaft Procede et dispositif pour effectuer des transmissions de donnees en simplex
FR2859053A1 (fr) * 2003-08-21 2005-02-25 Chamberlain Group Inc Appareil seulement emetteur sans fil, emetteur de commande a distance d'un actionneur de barriere mobile et procede de selection d'une frequence d'emission pour un tel appareil
US7519400B2 (en) 2005-05-27 2009-04-14 Dei Headquarters, Inc. Multi-modulation remote control communication system
WO2010057902A1 (fr) * 2008-11-21 2010-05-27 Valeo Securite Habitacle Système de communication pour véhicule automobile
WO2011101729A1 (fr) * 2010-02-19 2011-08-25 Toyota Jidosha Kabushiki Kaisha Récepteur, système de communication sans fil, et procédé de réception
CN102400605A (zh) * 2011-11-16 2012-04-04 深圳市警报电子科技有限公司 分频分功率分码发送的感应式汽车进入方法
CN105261173A (zh) * 2015-10-10 2016-01-20 奇瑞汽车股份有限公司 一种基于fsk调制的跳频汽车遥控方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57204653A (en) * 1981-06-10 1982-12-15 Toshiba Corp Transmitting and receiving device
GB2161344A (en) * 1984-07-06 1986-01-08 Philips Electronic Associated Transmission of digital data
GB2311155A (en) * 1996-03-14 1997-09-17 Siemens Ag Anti-theft system for a motor vehicle
GB2332548A (en) * 1997-12-20 1999-06-23 Rover Group Security system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57204653A (en) * 1981-06-10 1982-12-15 Toshiba Corp Transmitting and receiving device
GB2161344A (en) * 1984-07-06 1986-01-08 Philips Electronic Associated Transmission of digital data
GB2311155A (en) * 1996-03-14 1997-09-17 Siemens Ag Anti-theft system for a motor vehicle
GB2332548A (en) * 1997-12-20 1999-06-23 Rover Group Security system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 058 (E - 163) 10 March 1983 (1983-03-10) *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000074268A1 (fr) * 1999-05-26 2000-12-07 Siemens Aktiengesellschaft Procede et dispositif pour effectuer des transmissions de donnees en simplex
FR2859053A1 (fr) * 2003-08-21 2005-02-25 Chamberlain Group Inc Appareil seulement emetteur sans fil, emetteur de commande a distance d'un actionneur de barriere mobile et procede de selection d'une frequence d'emission pour un tel appareil
US7519400B2 (en) 2005-05-27 2009-04-14 Dei Headquarters, Inc. Multi-modulation remote control communication system
WO2010057902A1 (fr) * 2008-11-21 2010-05-27 Valeo Securite Habitacle Système de communication pour véhicule automobile
FR2938991A1 (fr) * 2008-11-21 2010-05-28 Valeo Securite Habitacle Systeme de communication pour vehicule automobile.
CN102232273A (zh) * 2008-11-21 2011-11-02 法雷奥安全座舱公司 用于汽车的通信系统
WO2011101729A1 (fr) * 2010-02-19 2011-08-25 Toyota Jidosha Kabushiki Kaisha Récepteur, système de communication sans fil, et procédé de réception
CN102763140A (zh) * 2010-02-19 2012-10-31 丰田自动车株式会社 接收机、无线通信系统及接收方法
US8588715B2 (en) 2010-02-19 2013-11-19 Toyota Jidosha Kabushiki Kaisha Receiver, wireless communication system, and receiving method
CN102400605A (zh) * 2011-11-16 2012-04-04 深圳市警报电子科技有限公司 分频分功率分码发送的感应式汽车进入方法
CN102400605B (zh) * 2011-11-16 2017-11-10 深圳市警豹电子科技有限公司 分频分功率分码发送的感应式汽车进入方法
CN105261173A (zh) * 2015-10-10 2016-01-20 奇瑞汽车股份有限公司 一种基于fsk调制的跳频汽车遥控方法

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