EP1538058A1 - Method and system of compensating variations in the voltage in the sending coil of a rail contact - Google Patents

Method and system of compensating variations in the voltage in the sending coil of a rail contact Download PDF

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Publication number
EP1538058A1
EP1538058A1 EP03360134A EP03360134A EP1538058A1 EP 1538058 A1 EP1538058 A1 EP 1538058A1 EP 03360134 A EP03360134 A EP 03360134A EP 03360134 A EP03360134 A EP 03360134A EP 1538058 A1 EP1538058 A1 EP 1538058A1
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EP
European Patent Office
Prior art keywords
temperature
rail contact
transmitting coil
supply voltage
calibration curve
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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.)
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Application number
EP03360134A
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German (de)
French (fr)
Inventor
Bernd Klose
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Alcatel CIT SA
Alcatel Lucent SAS
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Alcatel CIT SA
Alcatel SA
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Publication date
Application filed by Alcatel CIT SA, Alcatel SA filed Critical Alcatel CIT SA
Priority to EP03360134A priority Critical patent/EP1538058A1/en
Publication of EP1538058A1 publication Critical patent/EP1538058A1/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L1/00—Devices along the route controlled by interaction with the vehicle or train
    • B61L1/20—Safety arrangements for preventing or indicating malfunction of the device, e.g. by leakage current, by lightning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L1/00—Devices along the route controlled by interaction with the vehicle or train
    • B61L1/16—Devices for counting axles; Devices for counting vehicles
    • B61L1/167—Circuit details

Definitions

  • the invention relates to a method for balancing Transmission power fluctuations of a transmitting coil of a rail contact and a rail contact system for performing the method.
  • the procedure is particularly suitable for use in axle counting points (axle counter) of Treadles.
  • Each axle counter contains metering points with two rail contacts and one or more evaluation units.
  • Each axle counter monitors a track section assigned to it. detected the axle counter is a passing rail vehicle, the track section switched busy. Detects in the direction of travel of the rail vehicle nearest axle counter the passing rail vehicle, the Track section released again.
  • Electronic rail contacts often consist of two at one Mounted on the rail, spatially consecutive transmission coils, which are fed with audio frequency alternating currents and two on the each opposite rail side arranged with the Transmit coils inductively coupled receiver coils.
  • One send and one each Receiver coil together form a pulse generator.
  • the in the Receive coil induced voltages will be near the Rail contact arranged evaluation unit supplied and evaluated there.
  • the falling off and the phase rotation of the receiving voltages is due to the Coupling between the transmitting and receiving coils when passing a Vehicle wheel.
  • the induced voltages in the receiver coils are in implemented digital signals from which finally direction-dependent Counts are derived.
  • EP 02360127.1 is a Wheel sensor device, i. a rail contact on track systems, with means disclosed for protection against electromagnetic interference.
  • EP 401136 A describes a resonant circuit whose temperature dependent output signal by a controlled variation of the resistivity of the material of the Oszillalorspule is compensated. Such a resistance variation requires considerable equipment Expenditure. It is therefore error-prone and in particular for safety related applications, e.g. in train operation, not suitable.
  • the object of the invention is a method for balancing Transmission power fluctuations of a transmitting coil of a rail contact and to provide a rail contact system for carrying out the method, avoid the disadvantages of the prior art, in particular the one ensure temperature-independent behavior of the rail contact.
  • This object is achieved with regard to the method for compensating transmission power fluctuations of a transmitting coil of a rail contact according to the invention by a method for compensating temperature-dependent fluctuations in the transmission power of a voltage supply circuit acted upon by a supply voltage supply coil of a rail contact, with the method step controlling the supply voltage of a resonant circuit of the transmitting coil such that the resonant circuit of the transmitting coil is traversed by a temperature-independent current.
  • the inventive method is based on the finding that the electric current flowing through the rail contact, ie its transmitting coil, should be independent of the temperature-dependent ohmic resistance of the transmitting coil to ensure a constant transmission power. This causes a constant, ie temperature-independent, receiving voltage in the receiving coil of the rail contact. As a result, a temperature-independent rail contact characteristic is achieved.
  • the amplification factor is particularly preferred from a calibration curve containing the Determines gain factor as a function of the temperature, specified.
  • a calibration curve containing the Determines gain factor as a function of the temperature specified.
  • the rail contact system according to the invention for carrying out the method according to the invention has at least one transmitting coil, at least one receiving coil and at least one Voltage supply circuit on.
  • control agents provided for setting one of Voltage supply circuit provided supply voltage at least one resonant circuit of the transmitting coil, wherein the control means are set to adjust the supply voltage such that the Oscillation circuit of the transmitting coil of a temperature-independent current is flowed through.
  • the rail contact system according to the invention implements the Advantages of the method according to the invention in a simple and cost-effective Wise.
  • control means comprise a temperature measuring sensor, arranged to measure a temperature of the rail contact, preferably the transmitter coil, and an amplifier, designed to amplify the Supply voltage with a gain factor depending on the measured temperature.
  • a temperature measuring sensor arranged to measure a temperature of the rail contact, preferably the transmitter coil, and an amplifier, designed to amplify the Supply voltage with a gain factor depending on the measured temperature.
  • This embodiment of the invention Rail contact system is characterized by the availability of proven standard components and can be considered an autonomous system be used.
  • control agents have one Calibration curve memory
  • the calibration curve memory having a calibration curve Includes amplification factors as a function of temperature and means, arranged to read out gain factors as a function of the measured temperature from the calibration curve memory and passing the amplification factors read out to the amplifier.
  • this embodiment of the rail contact system according to the invention in particular for an implementation in the form of a microcomputer of in the rail contact system is integrated and in its memory Software code sections are loaded, which control the Control supply voltage according to the inventive method.
  • the rail contact system according to the invention is preferably used as an axle counter used. This significantly increases safety in rail transport.
  • a rail contact system according to the invention is shown in highly schematic form in a block diagram.
  • the rail contacts 9 of the axle counters are powered by the electronics module (power supply circuit 4) of the metering point with energy.
  • Each rail contact 9 has a transmitting coil 1 and a receiving coil 2, which lie relative to the track rails 3 opposite.
  • the transmitting coil 1 of the rail contacts 9 and the generator 8 and the capacitor 5 are connected as a series resonant circuit (resonant circuit) with each other.
  • the generator 8 provides a rectangular AC voltage having the transmitter frequency. The quality of this resonant circuit is determined by the ohmic resistance, eg the copper resistance, of the transmitting coil 1.
  • This resistance is temperature-dependent, whereby the transmission power of the transmitting coil 1, is influenced.
  • the generator 8 for supplying the rail contact ie the transmitting coil 1
  • the generator 8 for supplying the rail contact ie the transmitting coil 1
  • the generator 8 for supplying the rail contact ie the transmitting coil 1
  • the transmitting coil must supply a constant current or an alternating current with a constant time-dependent amplitude characteristic.
  • the temperature-dependent changes in resistance of the transmitting coil 1 remain without effect on their transmission power.
  • the transmitting coil thereby flows a constant current, or an alternating current with a constant time-dependent amplitude curve, which causes a constant transmission power and thus a constant receiving voltage to the receiving coil 2.
  • a temperature drift of the rail contact is thereby excluded.
  • the rail contact system In order to provide such a constant current control means 10 for adjusting the supply voltage of the series resonant circuit, so the transmitting coil 1, are provided in the rail contact system according to the invention.
  • the control means are set up to adjust the supply voltage such that the resonant circuit with the transmitting coil 1 is traversed by a temperature-independent current.
  • the supply voltage is varied accordingly.
  • the rail contact system has a temperature sensor 6 on the transmitting coil 1.
  • the control means further comprise an amplifier 7, which amplifies the supply voltage supplied by the generator with a gain factor in dependence on a temperature measured by the temperature measuring sensor 6. Amplification is also understood to mean attenuation, which is then a gain with a negative amplification factor.
  • the control means 10 also have a calibration curve memory 11.
  • a calibration curve representing amplification factors as a function of the measured temperature is stored.
  • a constant voltage at the output of the rail contact ie the receiving coil, ensured.
  • the temperature of the rail contact is measured and passed to control means, ie a circuit between power supply and rail contact.
  • control means ie a circuit between power supply and rail contact.
  • the supply voltage of the transmitting coil is varied as a function of the temperature of the rail contact, preferably of the transmitting coil.
  • the control means comprise an amplifier and have a calibration curve stored.
  • control means control the voltage at which the rail contact, ie its transmitting coil, is supplied depending on the measured temperature and the calibration curve.
  • the calibration curve can be determined during experiments.
  • the calibration curve includes the temperature dependence of the resistance of the transmitting coil.
  • the invention is not limited to the above Embodiment. Rather, a number of variants is conceivable, which even with fundamentally different type of execution of the characteristics of Invention.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Train Traffic Observation, Control, And Security (AREA)

Abstract

A method for compensating temperature dependent fluctuations of transmission power, involves testing the supply voltage of an oscillatory circuit of the transmission coil (1) such that the oscillation circuit of the transmission coil (1) is flowed through by a temperature-dependent current. Independent claims are included for the following: (1) (A) A rail contact system. (2) (B) Application of the rail contact system.

Description

Die Erfindung betrifft ein Verfahren zum Ausgleich von Sendeleistungsschwankungen einer Sendespule eines Schienenkontakts und ein Schienenkontaktsystem zur Durchführung des Verfahrens. Das Verfahren eignet sich insbesondere zum Einsatz in Achszählpunkten (Achszähler) von Schienenkontakten. The invention relates to a method for balancing Transmission power fluctuations of a transmitting coil of a rail contact and a rail contact system for performing the method. The procedure is particularly suitable for use in axle counting points (axle counter) of Treadles.

Stand der TechnikState of the art

In der Eisenbahnsignaltechnik werden zur Überwachung von Gleisabschnitten unter anderem Achszähler eingesetzt. Jeder Achszähler beinhaltet Zählpunkte mit zwei Schienenkontakten und eine oder mehrere Auswerteeinheiten.In railway signaling are used to monitor track sections used among other axle counter. Each axle counter contains metering points with two rail contacts and one or more evaluation units.

Jeder Achszähler überwacht einen ihm zugewiesenen Gleisabschnitt. Detektiert der Achszähler ein vorbeifahrendes Schienenfahrzeug, wird der Gleisabschnitt belegt geschaltet. Detektiert der in Fahrtrichtung des Schienenfahrzeugs nächstgelegene Achszähler das vorbeifahrende Schienenfahrzeug, wird der Gleisabschnitt wieder frei geschaltet.Each axle counter monitors a track section assigned to it. detected the axle counter is a passing rail vehicle, the track section switched busy. Detects in the direction of travel of the rail vehicle nearest axle counter the passing rail vehicle, the Track section released again.

Beim Vorüberlaufen eines Fahrzeugrades werden nacheinander zwei benachbarte Schienenkontakte betätigt und werden dabei zwei sich zeitlich überlappende Impulse ausgelöst. Diese Impulse werden in der Auswerteeinheit hinsichtlich ihrer Amplitude bewertet und in Zählimpulse umgesetzt, wobei die durch die Fahrrichtung der vorüberlaufenden Fahrzeugachsen gegebene Folge der Impulse die jeweilige Zählrichtung der Impulse bestimmt.When passing over a vehicle wheel are successively two adjacent rail contacts are actuated and are two in time overlapping pulses triggered. These pulses are in the evaluation unit evaluated in terms of their amplitude and converted into counts, the given by the direction of travel of the passing vehicle axles episode the pulses determines the respective counting direction of the pulses.

Elektronische Schienenkontakte bestehen häufig aus zwei an einer Fahrschiene angebrachten, räumlich hintereinander liegenden Sendespulen, die mit tonfrequenten Wechselströmen gespeist werden und zwei auf der jeweils gegenüberliegenden Schienenseite angeordneten, mit den Sendespulen induktiv gekoppelten Empfangsspulen. Je eine Sende- und eine Empfangsspule bilden gemeinsam einen Impulsgeber. Die in den Empfangsspulen induzierten Spannungen werden einer in der Nähe des Schienenkontaktes angeordneten Auswerteeinheit zugeführt und dort bewertet. Als Indiz für das Vorüberlaufen eines Fahrzeugrades an einem Schienenkontakt wird das vorübergehende Abfallen und die Phasendrehung der in den Empfangsspulen induzierten Spannungen gewertet. Das Abfallen und die Phasendrehung der Empfangsspannungen ist bedingt durch die Kopplung zwischen den Sende- und Empfangsspulen beim Passieren eines Fahrzeugrades. Die in den Empfangsspulen induzierten Spannungen werden in digitale Signale umgesetzt, aus denen schließlich fahrrichtungsabhängige Zählimpulse abgeleitet werden.Electronic rail contacts often consist of two at one Mounted on the rail, spatially consecutive transmission coils, which are fed with audio frequency alternating currents and two on the each opposite rail side arranged with the Transmit coils inductively coupled receiver coils. One send and one each Receiver coil together form a pulse generator. The in the Receive coil induced voltages will be near the Rail contact arranged evaluation unit supplied and evaluated there. As an indication of the passing over of a vehicle wheel on a Rail contact becomes transient drop and phase rotation evaluated in the receiving coil induced voltages. The falling off and the phase rotation of the receiving voltages is due to the Coupling between the transmitting and receiving coils when passing a Vehicle wheel. The induced voltages in the receiver coils are in implemented digital signals from which finally direction-dependent Counts are derived.

In der europäische Patentanmeldung EP 02360127.1 ist eine Radsensoreinrichtung, d.h. ein Schienenkontakt bei Gleisanlagen, mit Mitteln zum Schutz vor elektromagnetischen Störungen offenbart.In the European patent application EP 02360127.1 is a Wheel sensor device, i. a rail contact on track systems, with means disclosed for protection against electromagnetic interference.

Voraussetzung für einen ordnungsgemäßen Betrieb der von den elektronischen Schienenkontakten gesteuerten Achszählanlagen ist es, dass die von den Empfangsspulen an die Auswerteeinheit weitergegebenen Empfangsspannungen in ihrer Amplitude nicht auch von Parametern abhängig sind, die mit der Beeinflussung durch die Fahrzeugräder nichts zu tun haben. Insbesondere können sich auch Temperaturschwankungen in der Sendespule negativ auf die Funktionsweise der Schienenkontakte auswirken. Dies kann insbesondere dann der Fall sein, wenn die Sendeleistung, bedingt durch einen von der Temperatur der Sendespule abhängigen die Sendespule durchfliessenden elektrischen Strom unkontrollierten Schwankungen unterliegt. Die Schienenkontakte gemäß Stand der Technik weisen keine Mittel zum Ausgleich temperaturabhängiger Schwankungen der Sendeleistung auf. Daraus können sich erhebliche Sicherheitsprobleme bei der Verwendung der Schienenkontakte im Bahnbetrieb durch Fehlbeurteilung des Empfangssignals der Empfangsspule ergeben.Prerequisite for proper operation of the electronic Rail contacts controlled axle counting systems is that of the Receiving coils passed to the evaluation Reception voltages in their amplitude not dependent on parameters are those who have nothing to do with the influence of the vehicle wheels. In particular, also temperature fluctuations in the transmitting coil negatively affect the operation of the rail contacts. This can In particular, be the case when the transmission power due to a depending on the temperature of the transmitting coil, the transmitting coil flowing electrical current is subject to uncontrolled fluctuations. The rail contacts according to the prior art have no means for Compensation of temperature-dependent fluctuations in the transmission power. This can result in significant security issues when using the Rail contacts in railway operation by misjudgment of the received signal the receiver coil result.

Die EP 401136 A beschreibt einen Schwingkreis, dessen temperaturabhängiges Ausgabesignal durch eine kontrollierte Variation des spezifischen Widerstandes des Materials der Oszillalorspule kompensiert wird. Eine derartige Widerstandsvariation bedarf eines erheblichen apparativen Aufwandes. Sie ist daher fehleranfällig und insbesondere für sicherheitsrelevante Anwendungen, z.B. im Bahnbetrieb, nicht geeignet.EP 401136 A describes a resonant circuit whose temperature dependent output signal by a controlled variation of the resistivity of the material of the Oszillalorspule is compensated. Such a resistance variation requires considerable equipment Expenditure. It is therefore error-prone and in particular for safety related applications, e.g. in train operation, not suitable.

Aufgabe der ErfindungObject of the invention

Aufgabe der Erfindung ist es, ein Verfahren zum Ausgleich von Sendeleistungsschwankungen einer Sendespule eines Schienenkontakts und ein Schienenkontaktsystem zur Durchführung des Verfahrens bereitzustellen, die die Nachteile des Standes der Technik vermeiden, insbesondere die ein temperaturunabhängiges Verhalten des Schienenkontakts gewährleisten.The object of the invention is a method for balancing Transmission power fluctuations of a transmitting coil of a rail contact and to provide a rail contact system for carrying out the method, avoid the disadvantages of the prior art, in particular the one ensure temperature-independent behavior of the rail contact.

Gegenstand der ErfindungSubject of the invention

Gelöst wird diese Aufgabe hinsichtlich des Verfahrens zum Ausgleich von Sendeleistungsschwankungen einer Sendespule eines Schienenkontakts erfindungsgemäß durch ein Verfahren zum Ausgleich temperaturabhängiger Schwankungen der Sendeleistung einer von einer Spannungversorgungsschaltung mit einer Versorgungsspannung beaufschlagten Sendespule eines Schienenkontakts, mit dem Verfahrensschritt Kontrollieren der Versorgungsspannung eines Schwingkreises der Sendespule derart, dass der Schwingkreis der Sendespule von einem temperaturunabhängigen Strom durchflossen wird. Das erfindungsgemäße Verfahren basiert auf der Erkenntnis, dass der elektrische Strom, der den Schienenkontakt, d.h. dessen Sendespule, durchfliesst, unabhängig von dem temperaturabhängigen Ohmschen Widerstand der Sendespule sein sollte um eine konstante Sendeleistung zu gewährleisten.
Dies bewirkt eine konstante, d.h. temperaturunabhängige, Empfangsspannung in der Empfangsspule des Schienenkontakts. Dadurch wird eine temperaturunabhängige Schienenkontaktcharakteristik erreicht. This object is achieved with regard to the method for compensating transmission power fluctuations of a transmitting coil of a rail contact according to the invention by a method for compensating temperature-dependent fluctuations in the transmission power of a voltage supply circuit acted upon by a supply voltage supply coil of a rail contact, with the method step controlling the supply voltage of a resonant circuit of the transmitting coil such that the resonant circuit of the transmitting coil is traversed by a temperature-independent current. The inventive method is based on the finding that the electric current flowing through the rail contact, ie its transmitting coil, should be independent of the temperature-dependent ohmic resistance of the transmitting coil to ensure a constant transmission power.
This causes a constant, ie temperature-independent, receiving voltage in the receiving coil of the rail contact. As a result, a temperature-independent rail contact characteristic is achieved.

Bevorzugt umfasst das Kontrollieren die Verfahrensschritte:

  • Messen einer Temperatur des Schienenkontakts, bevorzugt der Sendespule und
  • Verstärken der Versorgungsspannung mit einem Verstärkungsfaktor in Abhängigkeit von der gemessenen Temperatur.
Dadurch wird ein Verfahren bereit gestellt, das in einem autonomen System realisierbar ist, das an jedem im Gleisnetz vorhandenem Schienenkontakt installiert werden kann.Preferably, the checking comprises the method steps:
  • Measuring a temperature of the rail contact, preferably the transmitting coil and
  • Amplify the supply voltage with a gain factor as a function of the measured temperature.
This provides a method that is feasible in an autonomous system that can be installed on any rail contact present in the rail network.

Besonders bevorzugt wird der Verstärkungsfaktor von einer Eichkurve, die den Verstärkungsfaktor in Abhängigkeit von der Temperatur festlegt, vorgegeben. Durch Vorgabe des Verstärkungsfaktors in Form einer Eichkurve ist das erfindungsgemäße Verfahren leicht auf eine geänderte Schienenkontaktkonfiguration anpassbar. Einfaches korrigieren der Eichkurve ermöglicht eine Korrektur von auftretenden Fehlern, z.B. einem Drift des Widerstandes der Sendespule durch Alterungsprozesse.The amplification factor is particularly preferred from a calibration curve containing the Determines gain factor as a function of the temperature, specified. By specifying the gain in the form of a calibration curve is inventive method easily changed to a Rail contact configuration customizable. Easy to correct the calibration curve allows correction of occurring errors, e.g. a drift of the Resistance of the transmitting coil due to aging processes.

Das erfindungsgemäße Schienenkontaktsystem zur Durchführung des erfindungsgemäßen Verfahrens weist mindestens eine Sendespule, mindestens eine Empfangsspule und mindestens eine Spannungversorgungsschaltung auf. Erfindungsgemäß sind Kontrollmittel vorgesehen, eingerichtet zum Einstellen einer von der Spannungversorgungsschaltung bereitgestellten Versorgungsspannung mindestens eines Schwingkreises der Sendespule, wobei die Kontrollmittel eingerichtet sind, die Versorgungsspannung derart einzustellen, dass der Schwingkreis der Sendespule von einem temperaturunabhängigen Strom durchflossen wird. Das erfindungsgemäße Schienenkontaktsystem realisiert die Vorteile des erfindungsgemäßen Verfahrens in einfacher und kostengünstiger Weise. The rail contact system according to the invention for carrying out the method according to the invention has at least one transmitting coil, at least one receiving coil and at least one Voltage supply circuit on. According to the invention are control agents provided for setting one of Voltage supply circuit provided supply voltage at least one resonant circuit of the transmitting coil, wherein the control means are set to adjust the supply voltage such that the Oscillation circuit of the transmitting coil of a temperature-independent current is flowed through. The rail contact system according to the invention implements the Advantages of the method according to the invention in a simple and cost-effective Wise.

Bevorzugt umfassen die Kontrollmittel einen Temperaturmesssensor, eingerichtet zur Messung einer Temperatur des Schienenkontakts, bevorzugt der Sendespule, und einen Verstärker, eingerichtet zur Verstärkung der Versorgungsspannung mit einem Verstärkungsfaktor in Abhängigkeit von der gemessenen Temperatur. Diese Ausführungsform des erfindungsgemäßen Schienenkontaktsystems zeichnet sich durch die Verwendbarkeit von bewährten Standardkomponenten aus und kann als autonomes System eingesetzt werden.Preferably, the control means comprise a temperature measuring sensor, arranged to measure a temperature of the rail contact, preferably the transmitter coil, and an amplifier, designed to amplify the Supply voltage with a gain factor depending on the measured temperature. This embodiment of the invention Rail contact system is characterized by the availability of proven standard components and can be considered an autonomous system be used.

Besonders bevorzugt verfügen die Kontrollmittel über einen Eichkurvenspeicher, wobei der Eichkurvenspeicher eine Eichkurve mit Verstärkungsfaktoren in Abhängigkeit von der Temperatur umfasst und Mittel, eingerichtet zum Auslesen von Verstärkungsfaktoren in Abhängigkeit von der gemessenen Temperatur aus dem Eichkurvenspeicher und zum Übergeben der ausgelesenen Verstärkungsfaktoren an den Verstärker. Neben der Realisierung der genannten Vorteile der Verwendung einer Eichkurve eignet sich diese Ausführungsform des erfindungsgemäßen Schienenkontaktsystems insbesondere für eine Implementierung in Form eines Mikrocomputers der in das Schienenkontaktsystem integriert ist und in dessen Speicher Softwarecodeabschnitte geladen sind, die die Kontrolle der Versorgungsspannung gemäß dem erfindungsgemäßen Verfahren steuern.Most preferably, the control agents have one Calibration curve memory, the calibration curve memory having a calibration curve Includes amplification factors as a function of temperature and means, arranged to read out gain factors as a function of the measured temperature from the calibration curve memory and passing the amplification factors read out to the amplifier. In addition to the Realization of the stated advantages of using a calibration curve is suitable this embodiment of the rail contact system according to the invention in particular for an implementation in the form of a microcomputer of in the rail contact system is integrated and in its memory Software code sections are loaded, which control the Control supply voltage according to the inventive method.

Bevorzugt wird das erfindungsgemäße Schienenkontaktsystem als Achszähler eingesetzt. Dies erhöht die Sicherheit im Schienenverkehr erheblich.The rail contact system according to the invention is preferably used as an axle counter used. This significantly increases safety in rail transport.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels der Erfindung, anhand der Figuren der Zeichnung, die erfindungswesentliche Einzelheiten zeigen, und aus den Ansprüchen. Die einzelnen Merkmale können je einzeln für sich oder zu mehreren in beliebiger Kombination bei einer Variante der Erfindung verwirklicht sein.Other features and advantages of the invention will become apparent from the following description of an embodiment of the invention, with reference to the figures of the drawing, the essential to the invention details show, and from the claims. The individual features can be individually for yourself or for several in any combination in a variant of Invention be realized.

Zeichnungdrawing

Ein Ausführungsbeispiel der erfindungsgemäßen Vorrichtung ist in der schematischen Zeichnung dargestellt und wird in der nachfolgenden Beschreibung erläutert.

Fig. 1
zeigt ein Blockschaltbild eines erfindungsgemäßen Schienenkontaktsystems.
An embodiment of the device according to the invention is shown in the schematic drawing and will be explained in the following description.
Fig. 1
shows a block diagram of a rail contact system according to the invention.

In Fig. 1 ist stark schematisiert in einem Blockschaltbild ein erfindungsgemäßes Schienenkontaktsystem dargestellt. Die Schienenkontakte 9 der Achszähler werden vom Elektronikeinsatz (Spannungsversorgungsschaltung 4) des Zählpunktes mit Energie versorgt. Jeder Schienenkontakt 9 weist eine Sendespule 1 und eine Empfangsspule 2 auf, die sich relativ zu den Bahnschienen 3 gegenüber liegen. Die Sendespule 1 der Schienenkontakte 9 sowie der Generator 8 und der Kondensator 5 sind als Serienschwingkreis (Schwingkreis) miteinander verschaltet. Der Generator 8 liefert eine rechteckförmige Wechselspannung, die die Senderfrequenz aufweist. Die Güte dieses Schwingkreises wird durch den Ohmschen Widerstand, z.B. den Kupferwiderstand, der Sendespule 1 bestimmt. Dieser Widerstand ist temperaturabhängig, wodurch die Sendeleistung der Sendespule 1, beeinflusst wird. Um diese Beeinflussung zu kompensieren muss der Generator 8 zur Speisung des Schienenkontakts, d.h. der Sendespule 1 einen konstanten Strom, bzw. einen Wechselstrom mit konstantem zeitabhängigen Amplitudenverlauf, liefern. Dadurch bleiben die temperaturabhängigen Widerstandsänderungen der Sendespule 1 ohne Auswirkung auf deren Sendeleistung. In der Sendespule fliesst dadurch ein konstanter Strom, bzw. ein Wechselstrom mit konstantem zeitabhängigen Amplitudenverlauf, der eine konstante Sendeleistung und damit eine konstante Empfangsspannung an der Empfangsspule 2 bewirkt. Ein Temperaturdrift des Schienenkontakts wird dadurch ausgeschlossen. Um einen derartigen konstanten Strom zu liefern sind bei dem erfindungsgemäßen Schienenkontaktsystem Kontrollmittel 10 zum Einstellen der Versorgungsspannung des Serienschwingkreises, also der Sendespule 1, vorgesehen. Die Kontrollmittel sind eingerichtet, die Versorgungsspannung derart einzustellen, dass der Schwingkreis mit der Sendespule 1 von einem temperaturunabhängigen Strom durchflossen wird. Die Versorgungsspannung wird entsprechend variiert. Dazu weist das Schienenkontaktsystem einen Temperatursensor 6 an der Sendespule 1 auf. Die Kontrollmittel umfassen ferner einen Verstärker 7, der die vom Generator gelieferte Versorgungsspannung mit einem Verstärkungsfaktor in Abhängigkeit von einer mit dem Temperaturmesssensor 6 gemessenen Temperatur verstärkt. Unter Verstärken wird ebenfalls ein Abschwächen verstanden, dabei handelt es sich dann um eine Verstärkung mit einem negativen Verstärkungsfaktor. Die Kontrollmittel 10 weisen ferner einen Eichkurvenspeicher 11 auf. In diesem Eichkurvenspeicher ist eine Eichkurve, die Verstärkungsfaktoren in Abhängigkeit von der gemessenen Temperatur wiedergibt, gespeichert. Es sind Mittel 12 zum Auslesen von Verstärkungsfaktoren in Abhängigkeit von der gemessenen Temperatur, symbolisiert durch den dargestellten Doppelpfeil, und zum Übergeben der ausgelesenen Verstärkungsfaktoren an den Verstärker 7, dargestellt durch einen Pfeil, vorhanden. Mit dem dargestellten Schienenkontaktsystem wird eine konstante Spannung am Ausgang des Schienenkontakts, d.h. dessen Empfangsspule, sichergestellt. Die Temperatur des Schienenkontakts wird gemessen und an Kontrollmittel, d.h. eine Schaltung zwischen Spannungversorgung und Schienenkontakt, übergeben. Um einen konstanten Strom zu erhalten, wird die Versorgungsspannung der Sendespule in Abhängigkeit von der Temperatur des Schienenkontakts, bevorzugt der Sendespule, variiert. Die Kontrollmittel umfassen einen Verstärker und haben eine Eichkurve gespeichert. Um einen konstanten Strom in der Sendespule zu erhalten, kontrollieren die Kontrollmittel die Spannung mit der der Schienenkontakt, d.h. dessen Sendespule, versorgt wird in Abhängigkeit von der gemessenen Temperatur und der Eichkurve. Die Eichkurve kann bei Experimenten ermittelt werden. Die Eichkurve beinhaltet die Temperaturabhängigkeit des Widerstandes der Sendespule.In Fig. 1 , a rail contact system according to the invention is shown in highly schematic form in a block diagram. The rail contacts 9 of the axle counters are powered by the electronics module (power supply circuit 4) of the metering point with energy. Each rail contact 9 has a transmitting coil 1 and a receiving coil 2, which lie relative to the track rails 3 opposite. The transmitting coil 1 of the rail contacts 9 and the generator 8 and the capacitor 5 are connected as a series resonant circuit (resonant circuit) with each other. The generator 8 provides a rectangular AC voltage having the transmitter frequency. The quality of this resonant circuit is determined by the ohmic resistance, eg the copper resistance, of the transmitting coil 1. This resistance is temperature-dependent, whereby the transmission power of the transmitting coil 1, is influenced. In order to compensate for this influence, the generator 8 for supplying the rail contact, ie the transmitting coil 1, must supply a constant current or an alternating current with a constant time-dependent amplitude characteristic. As a result, the temperature-dependent changes in resistance of the transmitting coil 1 remain without effect on their transmission power. In the transmitting coil thereby flows a constant current, or an alternating current with a constant time-dependent amplitude curve, which causes a constant transmission power and thus a constant receiving voltage to the receiving coil 2. A temperature drift of the rail contact is thereby excluded. In order to provide such a constant current control means 10 for adjusting the supply voltage of the series resonant circuit, so the transmitting coil 1, are provided in the rail contact system according to the invention. The control means are set up to adjust the supply voltage such that the resonant circuit with the transmitting coil 1 is traversed by a temperature-independent current. The supply voltage is varied accordingly. For this purpose, the rail contact system has a temperature sensor 6 on the transmitting coil 1. The control means further comprise an amplifier 7, which amplifies the supply voltage supplied by the generator with a gain factor in dependence on a temperature measured by the temperature measuring sensor 6. Amplification is also understood to mean attenuation, which is then a gain with a negative amplification factor. The control means 10 also have a calibration curve memory 11. In this calibration curve memory, a calibration curve representing amplification factors as a function of the measured temperature is stored. There are means 12 for reading out gain factors as a function of the measured temperature, symbolized by the illustrated double-headed arrow, and for transmitting the read-out amplification factors to the amplifier 7, represented by an arrow. With the illustrated rail contact system, a constant voltage at the output of the rail contact, ie the receiving coil, ensured. The temperature of the rail contact is measured and passed to control means, ie a circuit between power supply and rail contact. In order to obtain a constant current, the supply voltage of the transmitting coil is varied as a function of the temperature of the rail contact, preferably of the transmitting coil. The control means comprise an amplifier and have a calibration curve stored. In order to obtain a constant current in the transmitting coil, the control means control the voltage at which the rail contact, ie its transmitting coil, is supplied depending on the measured temperature and the calibration curve. The calibration curve can be determined during experiments. The calibration curve includes the temperature dependence of the resistance of the transmitting coil.

Die Erfindung beschränkt sich nicht auf das vorstehend angegebene Ausführungsbeispiel. Vielmehr ist eine Anzahl von Varianten denkbar, welche auch bei grundsätzlich anders gearteter Ausführung von den Merkmalen der Erfindung Gebrauch machen.The invention is not limited to the above Embodiment. Rather, a number of variants is conceivable, which even with fundamentally different type of execution of the characteristics of Invention.

Claims (7)

Verfahren zum Ausgleich temperaturabhängiger Schwankungen der Sendeleistung einer von einer Spannungversorgungsschaltung (4) mit einer Versorgungsspannung beaufschlagten Sendespule (1) eines Schienenkontakts (9),
mit dem Verfahrensschritt: Kontrollieren der Versorgungsspannung eines Schwingkreises der Sendespule (1) derart, dass der Schwingkreis der Sendespule (1) von einem temperaturunabhängigen Strom durchflossen wird. Method for compensating for temperature-dependent fluctuations in the transmission power of a transmission coil (1) of a rail contact (9) acted upon by a voltage supply circuit (4) with a supply voltage,
with the process step: Check the supply voltage of a resonant circuit of the transmitting coil (1) such that the resonant circuit of the transmitting coil (1) is traversed by a temperature-independent current. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Kontrollieren die Verfahrensschritte: Messen einer Temperatur des Schienenkontakts, bevorzugt der Sendespule und Verstärken der Versorgungsspannung mit einem Verstärkungsfaktor, Abhängigkeit von der gemessenen Temperatur umfasst.A method according to claim 1, characterized in that the controlling the process steps: Measuring a temperature of the rail contact, preferably the transmitting coil and Amplifying the supply voltage with a gain factor, depending on the measured temperature includes. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass der Verstärkungsfaktor von einer Eichkurve, die den Verstärkungsfaktor in Abhängigkeit von der Temperatur festlegt, vorgegeben wird.Method according to Claim 2, characterized in that the amplification factor is specified by a calibration curve which defines the amplification factor as a function of the temperature. Schienenkontaktsystem zur Durchführung des Verfahrens nach mindestens einem der Ansprüche 1 bis 3, mit einer Sendespule (1), einer Empfangsspule (2) und einer Spannungversorgungsschaltung (4),
dadurch gekennzeichnet, dass
Kontrollmittel (10) zum Einstellen einer von der Spannungversorgungsschaltung (4) bereitgestellten Versorgungsspannung eines Schwingkreises der Sendespule (1) vorgesehen sind, wobei die Kontrollmittel (10) eingerichtet sind, die Versorgungsspannung derart einzustellen, dass der Schwingkreis der Sendespule (1) von einem temperaturunabhängigen Strom durchflossen wird.Rail contact system for carrying out the method according to at least one of Claims 1 to 3, having a transmitting coil (1), a receiving coil (2) and a voltage supply circuit (4),
characterized in that
Control means (10) are provided for setting a supply voltage of a resonant circuit of the transmitting coil (1) provided by the voltage supply circuit (4), wherein the control means (10) are adapted to adjust the supply voltage such that the resonant circuit of the transmitting coil (1) is independent of a temperature Current is flowing through. Schienenkontaktsystem nach Anspruch 4, dadurch gekennzeichnet, dass die Kontrollmittel (10) einen Temperaturmesssensor (6), eingerichtet zur Messung einer Temperatur des Schienenkontakts (9), bevorzugt der Sendespule (1) und einen Verstärker (7), eingerichtet zur Verstärkung der Versorgungsspannung mit einem Verstärkungsfaktor, in Abhängigkeit von der gemessenen Temperatur umfasst.Rail contact system according to claim 4, characterized in that the control means (10) a temperature measuring sensor (6) arranged to measure a temperature of the rail contact (9), preferably the transmitting coil (1) and an amplifier (7) arranged to amplify the supply voltage with a gain factor, depending on the measured temperature includes. Schienenkontaktsystems nach Anspruch 5, dadurch gekennzeichnet, dass die Kontrollmittel (10) einen Eichkurvenspeicher (11), wobei der Eichkurvenspeicher (11) eine Eichkurve mit Verstärkungsfaktoren in Abhängigkeit von der Temperatur umfasst und Mittel (12), eingerichtet zum Auslesen von Verstärkungsfaktoren in Abhängigkeit von der gemessenen Temperatur aus dem Eichkurvenspeicher (11) und zum Übergeben der ausgelesenen Verstärkungsfaktoren an den Verstärker (7) aufweisen.Rail contact system according to claim 5, characterized in that the control means (10) a calibration curve memory (11), wherein the calibration curve memory (11) comprises a calibration curve with gain factors as a function of the temperature, and Means (12) arranged to read out gain factors as a function of the measured temperature from the calibration curve memory (11) and to pass the read-out amplification factors to the amplifier (7) exhibit. Verwendung des Schienenkontaktsystems nach mindestens einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass das Schienenkontaktsystem als Achszähler eingesetzt wird.Use of the rail contact system according to at least one of claims 4 to 6, characterized in that the rail contact system is used as an axle counter.
EP03360134A 2003-12-01 2003-12-01 Method and system of compensating variations in the voltage in the sending coil of a rail contact Withdrawn EP1538058A1 (en)

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FR2923913A1 (en) * 2007-11-21 2009-05-22 Lohr Ind Electrical discontinuity detecting assembly for terrestrial vehicle, has processing module receiving oscillation frequency of resonant circuit and converting frequency variation into default signal in case of electrical discontinuity
CN106218669A (en) * 2016-08-04 2016-12-14 深圳市英威腾交通技术有限公司 A kind of train high-voltage isolation grounding switch circuit
CN113264084A (en) * 2021-05-27 2021-08-17 海宁德科隆电子有限公司 Track axle counting sensor
WO2023247171A1 (en) * 2022-06-21 2023-12-28 Siemens Mobility GmbH Sensor, and railway track system comprising a sensor

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DE2929291B1 (en) * 1979-07-19 1980-12-04 Siemens Ag Circuit arrangement for generating axle counting pulses for axle counting systems
DE3302883A1 (en) * 1983-01-28 1984-08-02 Siemens AG, 1000 Berlin und 8000 München Circuit arrangement for generating axle counting pulses for axle counting systems

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Publication number Priority date Publication date Assignee Title
GB1130194A (en) * 1965-10-12 1968-10-09 Cie Generale D Electronique In Device for detecting the presence in, or the passage through, a given place of metallic objects, more particularly vehicles
DE2929291B1 (en) * 1979-07-19 1980-12-04 Siemens Ag Circuit arrangement for generating axle counting pulses for axle counting systems
DE3302883A1 (en) * 1983-01-28 1984-08-02 Siemens AG, 1000 Berlin und 8000 München Circuit arrangement for generating axle counting pulses for axle counting systems

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2923913A1 (en) * 2007-11-21 2009-05-22 Lohr Ind Electrical discontinuity detecting assembly for terrestrial vehicle, has processing module receiving oscillation frequency of resonant circuit and converting frequency variation into default signal in case of electrical discontinuity
WO2009098373A2 (en) * 2007-11-21 2009-08-13 Lohr Industrie Assembly for detecting electric discontinuity between an electric contact and an electrically conducting member mounted in the detection circuit
WO2009098373A3 (en) * 2007-11-21 2009-10-15 Lohr Industrie Assembly for detecting electric discontinuity between an electric contact and an electrically conducting member
CN101910852A (en) * 2007-11-21 2010-12-08 罗尔工业公司 Detection is at electrical contact and be installed in the assembly that the electricity between the conducting element in the testing circuit interrupts
US8405404B2 (en) 2007-11-21 2013-03-26 Lohr Industrie Assembly for detecting electric discontinuity between an electric contact and an electrically conducting member mounted in the detection circuit
RU2482505C2 (en) * 2007-11-21 2013-05-20 Лор Индустри Device for determination of electric discontinuity between electric contact and electric conductor installed within determination circuit
CN106218669A (en) * 2016-08-04 2016-12-14 深圳市英威腾交通技术有限公司 A kind of train high-voltage isolation grounding switch circuit
CN106218669B (en) * 2016-08-04 2018-01-02 深圳市英威腾交通技术有限公司 A kind of train high-voltage isolation grounding switch circuit
CN113264084A (en) * 2021-05-27 2021-08-17 海宁德科隆电子有限公司 Track axle counting sensor
WO2023247171A1 (en) * 2022-06-21 2023-12-28 Siemens Mobility GmbH Sensor, and railway track system comprising a sensor

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