EP0077249B1 - Zeitmessungsverfahren, zentralisiertes Verwaltungssystem mit diesem Verfahren und seine Anwendung zum Aufspüren von undichten Stellen in einem Flüssigkeitstransportnetzwerk - Google Patents

Zeitmessungsverfahren, zentralisiertes Verwaltungssystem mit diesem Verfahren und seine Anwendung zum Aufspüren von undichten Stellen in einem Flüssigkeitstransportnetzwerk Download PDF

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Publication number
EP0077249B1
EP0077249B1 EP19820401798 EP82401798A EP0077249B1 EP 0077249 B1 EP0077249 B1 EP 0077249B1 EP 19820401798 EP19820401798 EP 19820401798 EP 82401798 A EP82401798 A EP 82401798A EP 0077249 B1 EP0077249 B1 EP 0077249B1
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European Patent Office
Prior art keywords
counter
stations
chronometry
time
station
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EP19820401798
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English (en)
French (fr)
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EP0077249A1 (de
Inventor
François Deslignieres
Philippe Nachan
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EUROPEENNE DE TELETRANSMISSION C E T T Cie
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EUROPEENNE DE TELETRANSMISSION C E T T Cie
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G7/00—Synchronisation

Definitions

  • the invention relates to operating assistance systems having a centralized management station and more particularly relates to a method and a system for developing and transmitting information making it possible to establish the relative timing of events. occurred in different stations managed by the centralized management station.
  • control and / or command stations are dispersed for controlling an entire network.
  • Each of these stations is connected by an information transmission channel to a central station intended for centralized management of the network; the stations have no links with each other but can cover adjacent areas and transmit information linked to the same event or to events related to each other to the management center.
  • the problem which then arises in the management center is to date the events which have occurred in the different stations in relation to each other and in relation to a common time reference. This problem occurs in most industrial installations, for example in fluid transport installations, as well as in surveillance installations.
  • Another solution consists in establishing the chronometry in one place, the central station having the time reference, with repatriation of all the information in this place as soon as it is received. This can only be achieved by providing a network of transmission lines connecting each of the stations to the central management station, this additional network having only this function. This solution is expensive.
  • the subject of the invention is a method for preparing and transmitting information for the establishment of a relative timing which does not have the drawbacks mentioned above, and which in particular can be implemented in computer systems. operating aid already existing without introducing additional transmission lines.
  • the invention also relates to a device intended for the implementation of this method.
  • the invention can advantageously be applied to the detection and rapid localization of leaks in a fluid transport network.
  • time references are transmitted from the management center to the stations, and the latter date the information captured by transmitting with this information hourly data derived from these time references.
  • each station is capable of decoding, in addition to its own address used for the transmission of orders which are only intended for it, a general address used for the simultaneous transmission of a single general order to all stations.
  • this general order function is used to transmit to all remote stations a time base synchronization order. local, this order constituting the time reference common to all the stations for a time interval determined by the interval between two successive synchronization orders.
  • this compensation linked to the geographical location of the different stations in relation to the management center is preset and stored in memory at each station.
  • the information concerning the events detected in an area covered by a station is transmitted by the normal link between station and management center, but it is transmitted with hourly data supplied by the local time base; thus they can be stored a certain time before their transmission in order not to interrupt a priority procedure in progress.
  • These local time bases are synchronized, as indicated above. This synchronization is carried out by a periodic general order which depends on the desired precision, but this periodicity is not a characteristic of the system and the general order can be delayed with respect to its normal maturity when the management center is being treatment of another procedure.
  • a local time base with specific structure is provided in each station which includes a clock associated with a double counter, the first reset to zero by the general synchronization order, the second, of capacity greater than the maximum period between two resets to zero by two consecutive general orders, is automatically loaded by the content of the first when it reaches its maximum capacity.
  • the content of this second counter is first time information which is stored with the information to be transmitted concerning an event.
  • the method according to the invention consists in transmitting, in addition to the first hourly datum, a second datum intended to resolve the ambiguity.
  • the information received is stored with the corresponding received time data and with additional information produced in the management center itself setting the corresponding time unit (between two synchronization orders).
  • the method for preparing and transmitting chronometry information comprises an additional step after each synchronization which consists in preparing and transmitting to the management center additional reporting information to notify it that the synchronization has been successful. been carried out.
  • This information can be transmitted by change of signaling state.
  • the operating assistance system represented in this figure comprises a management center, PC, connected by bilateral transmission lines T ,, T 2 , T, ... to stations S 1 , S 2 , S 3 , ... dispersed, for the control and command of a network, for example a pipeline.
  • a management center PC
  • the management center PC and one of the stations S have been detailed in an exemplary embodiment.
  • Each remote station includes information sensors, c ,, c z , c 3 giving network state characteristics.
  • the information is transmitted to a processor p, (for active stations) which stores (and possibly processes) the information, and transmits it during an interrogation by the management center to a modulator-demodulator, m,.
  • the output of this modulator-demodulator provides the information to be transmitted on the transmission channel T, connected to the management center.
  • the PC management center includes a modulator-demodulator M which receives the information transmitted by the remote stations and transmits it after demodulation to a processor P i.
  • the processor P manages the transmission of the data received from the stations which it transmits to a random access memory, MV, or to the associated operating means, ME, while a second processor P 2 manages the means operating from data stored in memory MV and orders, entered by an operator; a printer 1, which is an example of an operating aid unit, has been shown in this figure as a peripheral of the processor P z .
  • Other processors can also be provided for additional processing, as well as other memories.
  • the active station S includes the processor p , but other stations may be only passive and not include a processor.
  • each station for the preparation and transmission of timing information, each station includes a timing circuit, CH, for the station S ,.
  • the function of this chronometry circuit is to date the information transmitted by the sensors c ,, c 2 , c 3
  • the dated information is then transmitted via the processor p ,, the modem m, and the normal transmission line T, to the central management station PC.
  • FIG. 2 represents the detailed diagram of an embodiment of this CH, chronometry circuit. It includes a clock 10, the output of which is connected to the counting input of the two counters 11 and 12.
  • the clock can be made of a quartz associated with a series of dividers to obtain the desired counting rate.
  • One of the counters, 11, is synchronized by resynchronization ticks transmitted by the central management station PC to all the stations simultaneously, by a general order. In practice, this synchronization consists in zeroing the counter 11. For this, the synchronization order involved in the input E RESET of the chronometry circuit is transmitted via a shaping circuit 13 to the reset input to zero, RESET, of counter 11.
  • This signal is also applied to the control input of a rendered count loop, 22, which performs a change of state of the output S CR for transmission to the central station in order to indicate that the reset has been completed.
  • the second counter 12 counts at the same time as the first but progresses to its maximum counting capacity which is greater than the maximum number of pulses at the frequency of the clock 10 between two successive resets of the counter 11.
  • an impulse is supplied to the output D of this counter and applied to - the read input L of the counter 11.
  • the parallel outputs of this counter 11 are connected to the parallel inputs of the counter d12, the latter is loaded by the content of the counter 11 at this time and then continues to count from this new initial value, always different from zero.
  • the parallel outputs of the counter 12 give a time reference at any time to a first entry of time data from a memory 14.
  • the chronometry circuit further comprises a flip-flop, 21, the input of which is connected to the output of the shaping circuit 13, a pulse supplied to this input passing the output of this flip-flop to state 1.
  • This flip-flop comprises a reset input connected to the output D of the counter 11.
  • the output, S ,, of this flip-flop is connected to a second time data input from memory 14.
  • the sensors c ,, c 2 ' c 3 associated with this station provide the signals they detect to shaping circuits, respectively 15, 16 and 17.
  • the outputs of these circuits are connected to the input a filter circuit 18, the output of which is connected to an input for taking account of memory 14, which when it receives a pulse stores the content of counter 12 present at the first time data input and an information bit corresponding to the state of the second time data entry.
  • These data are transmitted to the output of the chronometry circuit for storage, with the corresponding information in the station's processor, then transmission to the management center.
  • the chronometry circuit must not introduce an error greater than 10 ms on the hourly data transmitted. For this, a maximum duration of 10 6 ms or sixteen minutes and forty seconds must be provided between two synchronizations.
  • the counting frequency 100 Hz (period 10 ms)
  • a counting capacity of the counters equal to 2 ' 6 or 65536 or 655 360 ms
  • a general resynchronization every 600,000 ms, or every ten minutes the desired precision is obtained.
  • the timing circuit further comprises a multiplexer 20 which transfers the content of the memory in two bytes, the first transmitted on the order 0 0 and the second immediately after on order 0 ,.
  • the state of the ambiguity removal signal SA can be stored in a bit of the byte reserved for entering the event, this entry generally not occupying 8 bits.
  • the transmission of state change information from the sensors of a station is controlled by the management center.
  • the processor of a station P can store in its processing stack 21 bytes. If it is assumed that the information originating from a sensor occupies three bytes as indicated above, it is possible to acquire the data corresponding to 7 information originating from the sensors between two interrogations of the station by the central management station.
  • the information from the sensors is read every 20 ms for example and detected by change of state during two consecutive periods.
  • the minimum interval for detecting information from the same sensor is therefore 40 ms. Consequently, if events occur and are detected by several sensors from the same station in a slot of less than 40 ms, they are associated with the same time information. On the other hand, they are associated with the time information corresponding to their arrival if they are offset by more than 40ms.
  • the content Cp c of the modulo counter 10mn (normal value of the counting time in the stations) commands, at the end of each 10mn cycle, the issuance of the order general synchronization and the increase of one unit of the content of this capacity counter 144.
  • the transmission of this general order can be delayed as much as possible until that the counter 11 reaches its maximum capacity. Indeed, it is automatically reset to zero if it reaches this value.
  • the information arriving at the management center is stored there with on the one hand the hourly data transmitted with them, which set the time in an hourly unit of approximately 10 minutes, and on the other hand the value of the counter. the management center setting the corresponding time unit among the 144 units forming 24 hours.
  • the processor P 2 of this same management center can control the printing of the results, that is to say the appearances of the events with the corresponding times, classified in the order of appearance in the different stations, for example for facilitate the recognition of events linked to each other.
  • the invention applies to all telecontrol or telesurveillance installations having a centralized technical management station in them it is necessary to obtain chronometric information with an accuracy better than the cycle time of the installation.
  • Such a system in fact comprises control stations associated with a central operating station to which they are connected by a transmission medium consisting of a telephone channel.
  • a leak appears at a point in the network, a pressure drop occurs which progresses on each side in the pipeline, in the form of a negative pressure wave.
  • These waves arrive in stations with offsets with respect to the time of appearance of the leak as a function of the distance between the point of escape and the stations, and the speed of this wave, (of the order of 900 m / s).
  • This system is very advantageous since it does not require a very precise clock in each station and nevertheless gives good precision.

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Claims (5)

1. Verfahren zur relativen Zeitmessung von Vorgängen, die von Stationen aufgespürt werden, welche von einem Zentralposten entfernt sind, mit dem sie durch Übertragungsleitungen verbunden sind, dadurch gekennzeichnet,
- daß im Zentralposten Zeitbezugssignale erzeugt und simultan an die Stationen übertragen werden, wobei der Zeitabstand zwischen zwei aufeinanderfolgenden solchen Signalen Zeiteinheiten definiert, deren Dauer sehr viel länger ist als die Frage-Antwort-Zykluszeit vom Zentralposten an alle stationen;
- daß in jeder Station ein erster Zähler durch das erhaltene Bezugssignal gestartet wird, daß gleichzeitig Zählimpulse mithilfe eines Taktgebers dem ersten und einem zweiten Zähler geliefert werden, daß der zweite Zähler mit dem Inhalt des ersten Zählers geladen wird, wenn der zweite Zähler seine maximale Kapazität erreicht hat, wobei diese maximale Kapazität größer ist als die maximale Anzahl von Zählimpulsen in einer Zeiteinheit, daß jedem aufgespürten Vorgang Zeitdaten zugeordnet werden, die aus dem Inhalt des zweiten Zählers beim Aufspüren des Vorgangs und einer Information zur Aufhebung der Zweideutigkeit bestehen, die unterschiedliche Zustände am Anfang und am Ende einer Zeiteinheit hat, und daß bei Fragen des Zentralpostens an die Stationen die zu den Vorgängen gehörenden Informationen mit den entsprechenden Zeitdaten übertragen werden;
- und daß im zentralposten die erhaltenen Informationen mit einer zusätzlichen Zeitangabe versehen werden, die einer Zeiteinheitsnummer entspricht.
2. Verfarhren nach Anspruch 1, dadurch gekennzeichnet, daß in jeder Station bei der Nullrücksetzung des ersten Zählers eine Startbestätigungsinformation erzeugt und an den Zentralposten übertragen wird.
3. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Start darin besteht, den ersten Zähler auf Null zu setzen.
4. Zentralisierte techische Verwaltungsvorrichtung zur Durchführung des Verfahrens nach einem beliebigen der vorstehenden Ansprüche, in der der Zentralposten und die entfernten Stationen über eine leitung verbunden sind, die einen Übertragungskanal bildet, wobei der Zentralposten mit den Stationen entweder über allgemeine Befehle, die von allen Stationen berücksichtigt werden, oder über besondere Befehle verkehrt, die nur von einem Teil dieser Stationen berücksichigt werden, wobei die Stationen Sonden für zu messende Vorgänge aufweisen, dadurch gekennzeichnet, daß sie
- im Zentralposten Mittel zur Erzeugung und Übertragung des Zeitbezugssignals, das die Zeiteinheiten festlegt, aufgrund eines allgemeinen Befehls, und einen Zähler dieser Zeiteinheiten,
- und in jeder Station einen Zeitmeßkreis (CH,) enthält, der einen Taktgeber (10) aufweist, der mit den Zähleingängen eines ersten und eines zweiten Zählers (11,12) verbunden ist, wobei ein Bezugssignaleingang an den Eingang einer Kippstufe (21) und einen Starteingang (RAZ) für den ersten Zähler angeschlossen ist, wobei der zweite Zähler einen Vielfachladeeingang, der an den Vielfachausgang des ersten Zählers angeschlossen ist, und einen Ausgang (D) aufweist, der einerseits an einen Leseeingang (L) des ersten Zählers zur Steuerung des Ladens des zweiten Zählers und andererseits an einen Steuereingang für den Zustandswechsel der Kippstufe (21) angeschlossen ist, wobei der Zeitmeßkreis außerdem einen Transferkreis (14, 20) mit einem Steuereingang besitzt, der an die Sonden gekoppelt ist, und mit Dateneingängen, die an die Ausgänge des zweiten Zählers und der kippstufe zur Übertragung der entsprechenden Zeitdaten an den Ausgang des Zeitmeßkreises gekoppelt sind, wenn ein vorgang aufgespürt wird, und wobei die Station außerdem Mittel zur Einspeicherung der aufgespürten Vorgänge und der entsprechenden Zeitdaten besitzt.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die so konstruiert ist, daß sie zur schnellen Aufspürung und Lokalisierung von Lecks in einem Fluidtransportnetz dienen kann, wobei die Stationen entlang des Netzes verteilt angeordnet sind-und die aufgespürten Vorgänge Wellen negativen Drucks sind, die von einem Leck herrühren und von den Sonden von Stationen vor unt hinter der Leckstelle aufgespürt werden, wobei die Lokalisierung und der Zeitpunkt des Auftretens eines Lecks ausgehend von Zeitdaten bestimmt werden, die den aufgespürten Vorgängen zugeordnet sind.
EP19820401798 1981-10-09 1982-10-01 Zeitmessungsverfahren, zentralisiertes Verwaltungssystem mit diesem Verfahren und seine Anwendung zum Aufspüren von undichten Stellen in einem Flüssigkeitstransportnetzwerk Expired EP0077249B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8119074A FR2514599B1 (fr) 1981-10-09 1981-10-09 Procede de chronometrie, systeme de gestion centralisee mettant en oeuvre ce procede, et son application a la detection de fuites dans un reseau de transport de fluides
FR8119074 1981-10-09

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EP0077249A1 EP0077249A1 (de) 1983-04-20
EP0077249B1 true EP0077249B1 (de) 1986-01-15

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JP3618169B2 (ja) * 1996-05-16 2005-02-09 カシオ計算機株式会社 電子機器および当該電子機器を用いたシステム
JP3959552B2 (ja) * 1996-06-03 2007-08-15 忠弘 大見 配管施工の締付の管理方法

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US3798650A (en) * 1972-10-02 1974-03-19 Bendix Corp Means for synchronizing clocks in a time ordered communications system

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FR2514599B1 (fr) 1987-11-13
FR2514599A1 (fr) 1983-04-15
EP0077249A1 (de) 1983-04-20
DE3268577D1 (en) 1986-02-27

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