EP2788964A1 - Automationssystem für eine bewegliche barriere - Google Patents

Automationssystem für eine bewegliche barriere

Info

Publication number
EP2788964A1
EP2788964A1 EP12813512.6A EP12813512A EP2788964A1 EP 2788964 A1 EP2788964 A1 EP 2788964A1 EP 12813512 A EP12813512 A EP 12813512A EP 2788964 A1 EP2788964 A1 EP 2788964A1
Authority
EP
European Patent Office
Prior art keywords
central unit
signals
peripheral devices
transceiver
peripheral device
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.)
Granted
Application number
EP12813512.6A
Other languages
English (en)
French (fr)
Other versions
EP2788964B1 (de
Inventor
Paolo Ferron
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.)
Nice SpA
Original Assignee
Nice SpA
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 Nice SpA filed Critical Nice SpA
Publication of EP2788964A1 publication Critical patent/EP2788964A1/de
Application granted granted Critical
Publication of EP2788964B1 publication Critical patent/EP2788964B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C2201/00—Transmission systems of control signals via wireless link
    • G08C2201/60—Security, fault tolerance
    • G08C2201/63—Redundant transmissions

Definitions

  • the invention relates to an automation system for a movable barrier such as gates, doors, traffic bars, and awnings.
  • a movable barrier such as gates, doors, traffic bars, and awnings.
  • a gate we will refer to a gate as an example.
  • WO2010089788 e.g. does not provide a remedy for multiple reflections, so that statistically the system can be at times unsafe because the channel is practically interrupted for a variable period of time.
  • the central unit cannot receive signals from the safety devices and stops any activity.
  • Experimental tests by the Applicant have shown indeed the hazard and/ or the inefficiency of a not very robust system to such disturbances. For instance, one can consider a safety photocell placed near a movable, metal gate. It may happen that the conformation of the gate, together with the objects that surround it, reflects the radio waves transmitted from the central unit along a direct or indirect path, and the sum signal on the receiving antenna can be cancelled out. The signal cancellation is unpredictable, depends on the position of the gate and of all objects, whether fixed or movable, that surround it.
  • control central unit with at least one wireless transceiver adapted to send and receive radio signals
  • peripheral devices each having at least one wireless transceiver adapted to send and receive radio signals, wherein the central unit and/ or a or each peripheral device is adapted to transmit at least two signals with diversity techniques (either to the peripheral devices or to the central unit, mutatis mutandis).
  • the adoptable signals are not limited to radio signals but may include any technique of wireless transmission, e.g. infrared rays, ultrasound, UV rays and lasers.
  • the diversity techniques consist of establishing two or more wireless links between the central unit and the peripheral nodes in such a way that, e.g. for the receiving nodes, it is possible to choose the link that keeps itself above a minimum threshold of quality.
  • the preferred variants we list:
  • a single transceiver can be used by means of which the system transmits/ receives at different frequencies, or
  • the inventive concept is applicable to the central and/ or the peripheral devices. If the peripheral devices transmit signals not receivable by the central unit, one can in any event e.g. to safety lock the system after a certain number of failed transmissions.
  • the system comprises a wireless protocol for the central unit and the peripheral devices according to which during movement of the barrier the central unit transmits, within and with an established period, synchronization signals for the peripheral devices, to which they respond in turn in an assigned time window.
  • the advantage is to create in the wireless network an order and priority of the communications.
  • the central unit is adapted to transmit at least two synchronization signals at the same instant or sequentially on relevant different frequencies.
  • the peripheral devices are adapted to receive the signals in distinct time windows, thus they have the possibility to correctly receive al least a signal after the interference, usually short and impulsive in nature, is disappeared.
  • the central unit is adapted to generate the at least two signals so that they contain an identification data of said frequency and/ or of the actual transmission packet.
  • the purpose is to inform the peripheral devices about the type of received packet, so that they do not lose the synchronism and/ or the position of the received data within the transmission frame or protocol.
  • a peripheral device comprises a timer set to delay the transmission in its own time window by a delay inversely proportional to the delay in receiving one of said at least two signals.
  • the advantage is to maintain constant or approximately constant the transmission instant of the response signal towards the central unit.
  • the timer is set to activate the transmission in a time window with a constant delay with respect to the beginning of said established period. This allows the temporal constancy of the response signals in the frame.
  • a peripheral device is configured to skip, within said established period, the receiving phase in the time windows subsequent to that in which it has received a valid sync signal.
  • the advantage is to save energy (the peripheral devices are usually battery powered) by removing a useless operative phase in the actual period of the frame.
  • a peripheral device is configured to transmit to the central unit an error signal on an emergency channel after a certain number of unsuccessful attempts to receive the synchronization signal in each time window.
  • the advantage is to alert the central unit of a probable malfunction, to which it can react by safely blocking the system.
  • the invention also contemplates a method of wireless communication of an automation system for a movable barrier, the system comprising a central unit with at least one wireless transceiver and one or more peripheral devices each having at least a wireless transceiver, characterized in that the transceiver of the central unit and / or of a or each peripheral device transmits signals with diversity techniques (either to the peripheral devices or to the central unit, mutatis mutandis) .
  • the central unit and the devices communicate in wireless mode by means of a protocol by which, during the movement of the barrier, the central unit transmits within and with an established period a synchronization signal for the peripheral devices, to which they respond in turn in an assigned time window.
  • the method can also contemplate as a phase each programmed action of the central unit and/ or of a peripheral device as described herein.
  • Fig 1 shows a generic scheme of an automation system
  • Fig 2 shows a timing diagram of the protocol of the system.
  • a plant 10 for automatically moving a gate 12 by means of a motor 14 is composed of a central unit 20, which controls the motor 14 and can be integrated in it, and various peripheral devices 30 (e.g. two photocells, a flashing light, a sensitive edge, a remote control).
  • the communication between the central unit 20 and the peripheral devices 30, and vice versa, takes place without cable connections but through wireless means.
  • Each component/ device that composes the plant 10 is part of a wireless network and is identified as a node of the network.
  • the central unit 20 acts as a "master node” and the peripheral devices as "slave nodes".
  • the central unit 20 and each device 30 are provided respectively with a radio transceiver 24, 34 and antennas 22, 32 to communicate with each other.
  • Fig 2 illustrates schematically the communication protocol while the gate is in motion (indicated by the arrow F).
  • the protocol is described with two time axes LI and L2: LI for the transmitted and received signals by the central unit 20 and L2 for those transmitted and received by the peripheral devices 30.
  • the protocol has a period Tr, which is divided internally into two intervals Tc and TD.
  • Tc the central unit 20 sends to the peripheral devices synchronizing signals while in the interval TD the peripheral devices respond sequentially, or according to the instructions contained in the received command, to the central unit 20.
  • the frequencies used are relatively close to each other in order to fall within the same frequency band granted for the application (e.g. the band 868.6-869.700 MHz). Moreover, this is advantageous because it allows the use of a single antenna and a single transceiver without having to provide special matching circuits.
  • the double transmission of the command ensures that at least one of the two signals will arrive to the antennas 32 of the peripheral devices 30, without undergoing attenuation by reflections and/ or multiple paths.
  • the slave nodes 30 tune in by tuning on the first frequency fi in a time window 84 simultaneous and synchronized with the packet 80 (sync signal) to receive it. If on the first frequency fi the signal or packet is not received or is too disturbed to compromise decoding thereof, the slave nodes 30 tune on the second frequency £2 in a time window 86 simultaneous and synchronized with the packet 82, which is equal to the previous packet 80. In the absence of noise on the first frequency fi, consumption in the slave nodes 30 is minimum because the listening time on the second frequency £2 does not extend.
  • each slave node 30, or only the polled nodes transmits within the interval TD its own answer to the central or master node 20 during an assigned time window, indicated e.g. with 88 or 90.
  • the response signal of the nodes 30 is received by the central unit 20 in the time windows 81.
  • the precise duration and position of the windows 84, 86, 88, 90 within the interval Tc or TD is adjusted in the slave nodes 30 by timers.
  • a slave node 30 adjusts a timer by setting in it a delay dependent on which window 84, 86 the sync signal 80 or 82 is received in from the central or master node 20.
  • the packets 80, 82 may comprise: an identification data of the central unit, and/ or a network identifier, and/ or an identifier of the recipient, a type of command, etc., a data that identifies the relative frequency of transmission fi or £2 and/ or the particular type of packet 80, 82.
  • the purpose is to prevent a node 30 intercepting and misunderstanding a packet 80, 82 during e.g. an initial scan of network installation.
  • the central unit 20 normally receives with period ⁇ the answers of slave nodes 30.
  • the central unit 20 transmits the second packet 82 only if it detects a problem in the previous communication (e.g. during the previous period ⁇ ) e.g. because it has not received an answer from a polled slave node.
  • the system is open to many variations.
  • two antennas connected to a RF switch in the central unit to send in sequence or simultaneously one same frequency to two different antennas, preferably arranged orthogonally to each other.
  • the carrier frequency will travel different propagation paths in space and will reach the antenna of the node at least once not attenuated.
  • Another option is the time diversity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
EP12813512.6A 2011-12-05 2012-12-03 Automationssystem für eine bewegliche barriere Not-in-force EP2788964B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000166A ITTV20110166A1 (it) 2011-12-05 2011-12-05 Sistema di automazione per una barriera mobile
PCT/IB2012/056923 WO2013084136A1 (en) 2011-12-05 2012-12-03 Automation system for a movable barrier

Publications (2)

Publication Number Publication Date
EP2788964A1 true EP2788964A1 (de) 2014-10-15
EP2788964B1 EP2788964B1 (de) 2018-08-29

Family

ID=45541029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12813512.6A Not-in-force EP2788964B1 (de) 2011-12-05 2012-12-03 Automationssystem für eine bewegliche barriere

Country Status (3)

Country Link
EP (1) EP2788964B1 (de)
IT (1) ITTV20110166A1 (de)
WO (1) WO2013084136A1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7519400B2 (en) * 2005-05-27 2009-04-14 Dei Headquarters, Inc. Multi-modulation remote control communication system
JP4325698B2 (ja) * 2007-04-19 2009-09-02 株式会社デンソー 車両用遠隔制御システム、携帯機、および車載装置
IT1395493B1 (it) 2009-02-05 2012-09-28 Rib Srl Sistema di comunicazione senza fili per gestire dispositivi di comando, di protezione e di segnalazione

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2013084136A1 *

Also Published As

Publication number Publication date
WO2013084136A1 (en) 2013-06-13
EP2788964B1 (de) 2018-08-29
ITTV20110166A1 (it) 2013-06-06

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