EP1746008B1 - Circuit for monitoring the occupancy of points or of a track section - Google Patents

Circuit for monitoring the occupancy of points or of a track section Download PDF

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Publication number
EP1746008B1
EP1746008B1 EP06117115A EP06117115A EP1746008B1 EP 1746008 B1 EP1746008 B1 EP 1746008B1 EP 06117115 A EP06117115 A EP 06117115A EP 06117115 A EP06117115 A EP 06117115A EP 1746008 B1 EP1746008 B1 EP 1746008B1
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Prior art keywords
osc
controller
signal
synchronous rectifier
control signal
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EP06117115A
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German (de)
French (fr)
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EP1746008A3 (en
EP1746008A2 (en
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Marcus Else
Wolfgang Eue
Frank Gertler
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Siemens AG
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Siemens AG
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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
    • B61L1/18—Railway track circuits
    • B61L1/181—Details
    • B61L1/187—Use of alternating current

Definitions

  • the invention relates to a circuit arrangement for monitoring the occupancy state of a switch or a track area by means of a track circle, wherein during the driving of the track circuit by a rail vehicle, a resulting damping and resonance frequency change is detectable coupled with a synchronous rectifier for correlation in the track circuit coupled out of the track circuit Signals, which is connected via a low-pass filter with a controller for evaluating the correlation signal wherein the controller acts on a frequency generator whose output signal is coupled via an output stage in the track circuit.
  • This effective range is a 6 to 12 m long track section, which is formed by means of a capacitive connection between the rails and the inductances of the rails as a resonant circuit.
  • the controller detects damping and resonant frequency changes during a rail vehicle encounter, caused by axle shorting and damping by the iron masses of the car body.
  • AchskurzQuery when driven by a road vehicle, for example at a railroad crossing, can not be done, results in a distinctness of wheeled and rail vehicles.
  • the invention has for its object to provide a circuit arrangement of the generic type, the phase independence and increased safety of the track release allows.
  • the object is achieved in that the frequency generator generates a first control signal and a 90 ° offset from this second control signal, wherein the first control signal to a control input of the synchronous rectifier and the second control signal to a control input of a second synchronous rectifier, via a second low-pass filter is connected to the controller, is guided, and wherein signal inputs of the two synchronous rectifier are connected to the decoupled from the track circuit via a low-pass signal and the first and the second control signal via an exclusive-OR gate to the controller, said controller having means for checking the correct formation of the control signals.
  • the frequency generator generates a first control signal and a 90 ° offset from this second control signal, wherein the first control signal to a control input of the synchronous rectifier and the second control signal to a control input of a second synchronous rectifier, via a second low-pass filter is connected to the controller, is guided, and wherein signal inputs of the two synchronous rectifier are connected to the decoupled from the track circuit via a low-pass signal
  • the adjustable by the controller frequency generator is extended by two outputs for driving two synchronous rectifier, the two frequency signals generated by the frequency generator control signals are offset by 90 ° to each other.
  • the decoupled from the track circuit signal is filtered with a low-pass filter, before it reaches the signal inputs of the two synchronous rectifier.
  • the two synchronous rectifiers are each connected to the controller via low-pass filters.
  • the two correlation signals supplied to the controller are in principle identical, but offset by 90 ° to one another.
  • the controller uses the Pythagorean theorem to calculate the magnitude of the correlation voltage. However, an additional calculation of the phase angle is also possible.
  • the controller By connecting the controller with the exclusive OR gate, the resulting signal is evaluated at twice the track frequency. If this double track frequency is not detected, there is an error. If the controller can not detect a duty cycle of 50%, there is a phase error.
  • the two control signals may additionally be performed directly on the controller, wherein the controller checks the correct formation of the control signals.
  • the output signal of the exclusive-OR gate is additionally connected to the controller via low-pass filtering.
  • This low-pass filtering enables the controller to evaluate the voltage that is present, which must be exactly the mean between the voltage of a logic high and a logic low, so that a 50% duty cycle is proven.
  • the controller may be connected to a diagnostic module comprising means for determining age- and / or temperature-induced changes in the phase position of the first and / or second control signal.
  • an analog multiplier which is driven by an analog signal generated by the frequency generator.
  • An analog multiplier is more expensive than a synchronous rectifier, but has the consequence that the upstream low-pass filter can be made simpler.
  • the analog signal from the frequency rectifier to the analog multiplier is parameterized in such a way that it alternately multiplies + X and -X. In the simplest case, X is parameterized to 1.
  • a PLL (Phase Locked Loop) element for frequency stabilization can be provided instead of the frequency generator.
  • the sole figure shows a block diagram of a turnout circuit correlation detector.
  • a track circuit 1 which forms a resonant circuit of inductance-forming rail portions 2a and 2b and a capacitor 3.
  • this track circuit 1 is an AF signal coupled with a frequency of 20 to 30Hz.
  • a controller 4 which is connected via a frequency generator 5 and an output stage 6 for amplifying the frequency signal to the track circuit 1.
  • the frequency generator 5 which can be set by the controller 4 generates two digital output signals which are identical in magnitude but offset by 90 °.
  • the two output signals f Osz and f Osz + 90 ° are returned to the controller 4 for verification and also form the control signal for two synchronous rectifiers 7 and 7.1, which are connected via low-pass filters 9 and 9.1 to the controller 4.
  • the signal to be injected into the track circuit 1 is also fed to the controller 4 via a peak value rectifier 10.
  • the decoupled from the track circuit 1 signal is filtered with a low-pass filter 11 and forms the signal input of both the synchronous rectifier 7 and the synchronous rectifier 7.1.
  • the synchronous rectifiers 7 and 7.1 the two signals representing the input and the output of the track circuit 1 are virtually superimposed, so that correlation voltages U correlation and U correlation + 90 ° to be evaluated by the controller 4 are generated via the downstream low-pass filters 9 and 9.1.
  • the controller 4 carries out an absolute value calculation of the correlation voltage with the Pythagorean theorem.
  • control signals f Osz and f Osz + 90 ° formed by the frequency generator 5 for the synchronous rectifiers 7 and 7.1 they can be fed directly to the controller 4.
  • the two control signals f osz and f osc + 90 ° are linked by means of an exclusive / OR gate 12, wherein the resulting signal is 2f OszIst connected to the controller 4.
  • the control signals f Osz and f Osz + 90 ° have been generated correctly when the controller 4 can detect the double track frequency 2f OszISt .
  • the duty cycle must be 50%, so that a phase error is excluded can be.
  • a device for low-pass filtering 13 is branched off from the exclusive OR gate 12, whereby a voltage output signal U phase is generated, which the controller 4 can evaluate. If U phase is exactly the mean between the voltage of a logical high and a logical low, a duty cycle of 50% is proven.
  • the controller 4 generates from the correlation voltages U correlation and U correlation + 90 ° by phase-independent absolute value determination an output signal which activates a free or busy message 14 of the considered track section.
  • the controller 4 may be connected to a diagnostic module 15, which polls certain parameters and / or a diagnostic device 16, which evaluates controller states.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Tests Of Electric Status Of Batteries (AREA)
  • Near-Field Transmission Systems (AREA)
  • Alarm Systems (AREA)

Abstract

The arrangement has a controller (4) charging a frequency generator (5), whose output signal is coupled to a track circuit (1) by an output stage. The generator generates two control signals, where one of the signals is offset to the other signal around 90 degrees. The control signals are guided to control inputs of respective synchronous rectifiers (7, 7.1), where one rectifier is connected to the controller by a low-pass filter. Signal inputs of the rectifiers are connected with the signal generated by the track circuit.

Description

Die Erfindung betrifft eine Schaltungsanordnung zur Überwachung des Belegungszustandes einer Weiche oder eines Gleisbereiches mittels eines Gleiskreises, wobei während der Befahrung des Gleiskreises durch ein Schienenfahrzeug eine resultierende Dämpfungs- und Resonanzfrequenzänderung detektierbar ist, mit einem Synchrongleichrichter zur Korrelation in den Gleiskreis eingekoppelter mit aus dem Gleiskreis ausgekoppelten Signalen, der über einen Tiefpassfilter mit einem Controller zur Auswertung des Korrelationssignals verbunden ist wobei der Controller einen Frequenzgenerator beaufschlagt, dessen Ausgangssignal über eine Endstufe in den Gleiskreis einkoppelbar ist.The invention relates to a circuit arrangement for monitoring the occupancy state of a switch or a track area by means of a track circle, wherein during the driving of the track circuit by a rail vehicle, a resulting damping and resonance frequency change is detectable coupled with a synchronous rectifier for correlation in the track circuit coupled out of the track circuit Signals, which is connected via a low-pass filter with a controller for evaluating the correlation signal wherein the controller acts on a frequency generator whose output signal is coupled via an output stage in the track circuit.

Bei Weichensteuerungen muss gewährleistet sein, dass ein nachfolgendes Fahrzeug die Weiche nicht umstellen kann, wenn sich noch ein vorausfahrendes Fahrzeug im Bereich der Weiche befindet. Unabhängig von der Zuglänge darf der Gleisabschnitt erst wieder freigemeldet werden, wenn die Metallmasse des letzten Wagens den Wirkbereich verlassen hat. Dieser Wirkbereich ist ein 6 bis 12 m langer Gleisabschnitt, der mittels einer kapazitiven Verbindung zwischen den Schienen und den Induktivitäten der Schienen als Schwingkreis ausgebildet ist.For point controls, it must be ensured that a following vehicle can not change over the points if there is still a vehicle ahead in the area of the points. Regardless of the train length, the track section may not be cleared until the metal mass of the last carriage has left the effective area. This effective range is a 6 to 12 m long track section, which is formed by means of a capacitive connection between the rails and the inductances of the rails as a resonant circuit.

Der Controller detektiert Dämpfungs- und Resonanzfrequenzänderungen während der Befahrung durch ein Schienenfahrzeug, die durch Achskurzschluss und Bedämpfung durch die Eisenmassen des Wagenkastens hervorgerufen werden. Da ein Achskurzschluss bei Befahrung durch ein Straßenfahrzeug, beispielsweise an einen Bahnübergang, nicht erfolgen kann, ergibt sich eine Unterscheidbarkeit von Rad- und Schienenfahrzeugen.The controller detects damping and resonant frequency changes during a rail vehicle encounter, caused by axle shorting and damping by the iron masses of the car body. As a Achskurzschluss when driven by a road vehicle, for example at a railroad crossing, can not be done, results in a distinctness of wheeled and rail vehicles.

Aus der DE 103 20 680 A1 ist eine Schaltungsanordnung bekannt, bei der eine Detektion der Dämpfungs- und Resonanzfrequenzänderung durch Korrelation der in den Gleiskreis ein- und ausgekoppelten Signale erfolgt. Die Differenzierung zwischen Gleiskreisbeeinflussung durch Achskurzschluss oder Eisenmasse erfolgt durch Bewertung der Höhe der Korrelationsspannung. Damit das eingekoppelte und das ausgekoppelte Signal vor dem Synchrongleichrichter wieder phasensynchron sind, müssen frequenzabhängige Laufzeiten des zur Aufbereitung des ausgekoppelten Signals eingesetzten Filters kompensiert werden. Dazu ist eine Phasenanpassung im Signalweg des ausgekoppelten Signals vorgesehen. Nachteilig bei dieser Phasenanpassung ist neben dem Auftreten von Alterungserscheinungen vor allem deren Temperaturabhängigkeit. Die Phasenverschiebung während einer Befahrung kann nicht expliziert bestimmt werden; sie geht vielmehr indirekt in das auszuwertende Korrelationssignal ein.From the DE 103 20 680 A1 a circuit arrangement is known in which a detection of the attenuation and resonance frequency change is effected by correlation of the signals injected into and out of the track circuit. The differentiation between track circuit interference by Achskurzschluss or iron mass is carried out by evaluating the height of the correlation voltage. Thus, the coupled and the decoupled signal before the synchronous rectifier are again in phase, frequency-dependent maturities of the filter used for processing the decoupled signal must be compensated. For this purpose, a phase adjustment in the signal path of the decoupled signal is provided. A disadvantage of this phase adaptation is in addition to the occurrence of aging phenomena especially their temperature dependence. The phase shift during a cruise can not be determined explicitly; it rather goes indirectly into the correlation signal to be evaluated.

Der Erfindung liegt die Aufgabe zugrunde, eine Schaltungsanordnung der gattungsgemäßen Art anzugeben, die Phasenunabhängigkeit und erhöhte Sicherheit der Gleisfreimeldung ermöglicht.The invention has for its object to provide a circuit arrangement of the generic type, the phase independence and increased safety of the track release allows.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, dass der Frequenzgenerator ein erstes Steuersignal und ein gegenüber diesem um 90° versetztes zweites Steuersignal erzeugt, wobei das erste Steuersignal auf einen Steuereingang des Synchrongleichrichters und das zweite Steuersignal auf einen Steuereingang eines zweiten Synchrongleichrichters, der über einen zweiten Tiefpassfilter mit dem Controller verbunden ist, geführt ist, und wobei Signaleingänge der beiden Synchrongleichrichter mit dem aus dem Gleiskreis über einen Tiefpass ausgekoppelten Signal verbunden sind und das erste und das zweite Steuersignal über ein Exklusiv/Oder-Gatter auf den Controller geführt sind, wobei der Controller Mittel zur Überprüfung der korrekten Bildung der Steuersignale aufweist. Auf diese Weise ergibt sich eine phasenunabhängige Betragswertermittlung, so dass auf eine Phasenanpassung als Schaltungsteil verzichtet werden kann. Stattdessen wird der vom Controller einstellbare Frequenzgenerator um zwei Ausgänge zur Ansteuerung zweier Synchrongleichrichter erweitert, wobei die beiden vom Frequenzgenerator erzeugten Steuersignale frequenzmäßig um 90° zueinander versetzt sind. Das aus dem Gleiskreis ausgekoppelte Signal wird mit einem Tiefpass gefiltert, bevor es an die Signaleingänge der beiden Synchrongleichrichter gelangt. Die beiden Synchrongleichrichter sind jeweils über Tiefpassfilter mit dem Controller verbunden. Die beiden dem Controller zugeführten Korrelationssignale sind prinzipiell identisch, aber um 90° zueinander versetzt. Im Controller erfolgt mit dem Satz des Pythagoras eine Betragswertberechnung der Korrelationsspannung. Möglich ist aber auch eine zusätzliche Berechnung des Phasenwinkels. Durch die Beschaltung des Controllers mit dem Exklusiv/Oder-Gatter wird das dabei entstehende Signal mit der doppelten Gleiskreisfrequenz auswertet. Wird diese doppelte Gleiskreisfrequenz nicht festgestellt, liegt ein Fehler vor. Wenn der Controller dabei nicht ein Tastverhältnis von 50% feststellen kann, liegt ein Phasenfehler vor.According to the invention, the object is achieved in that the frequency generator generates a first control signal and a 90 ° offset from this second control signal, wherein the first control signal to a control input of the synchronous rectifier and the second control signal to a control input of a second synchronous rectifier, via a second low-pass filter is connected to the controller, is guided, and wherein signal inputs of the two synchronous rectifier are connected to the decoupled from the track circuit via a low-pass signal and the first and the second control signal via an exclusive-OR gate to the controller, said controller having means for checking the correct formation of the control signals. In this way results in a phase-independent absolute value determination, so that can be dispensed with a phase adjustment as a circuit part. Instead, the adjustable by the controller frequency generator is extended by two outputs for driving two synchronous rectifier, the two frequency signals generated by the frequency generator control signals are offset by 90 ° to each other. The decoupled from the track circuit signal is filtered with a low-pass filter, before it reaches the signal inputs of the two synchronous rectifier. The two synchronous rectifiers are each connected to the controller via low-pass filters. The two correlation signals supplied to the controller are in principle identical, but offset by 90 ° to one another. The controller uses the Pythagorean theorem to calculate the magnitude of the correlation voltage. However, an additional calculation of the phase angle is also possible. By connecting the controller with the exclusive OR gate, the resulting signal is evaluated at twice the track frequency. If this double track frequency is not detected, there is an error. If the controller can not detect a duty cycle of 50%, there is a phase error.

Gemäß Anspruch 2 können die beiden Steuersignale zusätzlich direkt auf den Controller geführt sein, wobei der Controller die korrekte Bildung der Steuersignale überprüft.According to claim 2, the two control signals may additionally be performed directly on the controller, wherein the controller checks the correct formation of the control signals.

Da Controller einfacherer Bauart das Tastverhältnis der Steuersignale nicht selbst überprüfen können, ist gemäß Anspruch 3 vorgesehen, dass das Ausgangssignal des Exklusiv/Oder-Gatters zusätzlich über eine Tiefpassfilterung mit dem Controller verbunden ist. Durch diese Tiefpassfilterung kann der Controller die anstehende Spannung auswerten, wobei diese genau das Mittel zwischen der Spannung eines logischen high und eines logischen low erreichen muss, damit ein Tastverhältnis von 50% nachgewiesen ist.Since controllers of simpler design can not check the duty cycle of the control signals themselves, is in accordance with claim 3, the output signal of the exclusive-OR gate is additionally connected to the controller via low-pass filtering. This low-pass filtering enables the controller to evaluate the voltage that is present, which must be exactly the mean between the voltage of a logic high and a logic low, so that a 50% duty cycle is proven.

Gemäß Anspruch 4 kann der Controller mit einem Diagnosemodul beschaltet sein, das Mittel zur Feststellung von alterungs- und/oder temperaturbedingten Änderungen der Phasenlage des ersten und/oder zweiten Steuersignals umfasst.According to claim 4, the controller may be connected to a diagnostic module comprising means for determining age- and / or temperature-induced changes in the phase position of the first and / or second control signal.

Anstelle mindestens eines der beiden Synchrongleichrichter kann gemäß Anspruch 5 ein Analogmultiplizierer vorgesehen sein, der von einem vom Frequenzgenerator erzeugten analogen Signal angesteuert wird. Ein Analogmultiplizierer ist zwar teuerer als ein Synchrongleichrichter, hat aber zur Folge, dass der vorgeschaltete Tiefpass einfacher ausgebildet sein kann. Das analoge Signal vom Frequenzgleichrichter an den Analogmultiplizierer wird dabei derart parametriert, dass es zur abwechselnden Multiplikation mit +X und -X kommt. Im einfachsten Fall ist X auf 1 parametriert.Instead of at least one of the two synchronous rectifier can be provided according to claim 5, an analog multiplier which is driven by an analog signal generated by the frequency generator. An analog multiplier is more expensive than a synchronous rectifier, but has the consequence that the upstream low-pass filter can be made simpler. The analog signal from the frequency rectifier to the analog multiplier is parameterized in such a way that it alternately multiplies + X and -X. In the simplest case, X is parameterized to 1.

Weiterhin kann gemäß Anspruch 6 anstelle des Frequenzgenerators ein PLL (Phase Locked Loop)-Element zur Frequenzstabilisierung vorgesehen sein.Furthermore, according to claim 6 instead of the frequency generator, a PLL (Phase Locked Loop) element for frequency stabilization can be provided.

Die Erfindung wird nachfolgend anhand einer figürlichen Darstellung näher erläutert.The invention will be explained in more detail with reference to a figurative representation.

Die einzige Figur zeigt ein Blockschaltbild eines Weichensperrkreis-Korrelationsdetektors.The sole figure shows a block diagram of a turnout circuit correlation detector.

Dargestellt ist ein Gleiskreis 1, der einen Schwingkreis aus Induktivitäten bildenden Schienenbereichen 2a und 2b und einem Kondensator 3 bildet. In diesen Gleiskreis 1 wird ein NF-Signal mit einer Frequenz von 20 bis 30Hz eingekoppelt. Dazu dient ein Controller 4, der über einen Frequenzgenerator 5 und eine Endstufe 6 zur Verstärkung des Frequenzsignals mit dem Gleiskreis 1 verbunden ist. Der vom Controller 4 einstellbare Frequenzgenerator 5 erzeugt zwei digitale Ausgangssignale, die betragsmäßig identisch, aber um 90° versetzt sind. Die beiden Ausgangssignale fOsz und fOsz + 90° sind zwecks Überprüfung auf den Controller 4 zurückgeführt und bilden außerdem das Steuersignal für zwei Synchrongleichrichter 7 und 7.1, die jeweils über Tiefpassfilter 9 und 9.1 mit dem Controller 4 verbunden sind. Das in den Gleiskreis 1 einzukoppelnde Signal ist über einen Spitzenwertgleichrichter 10 ebenfalls auf den Controller 4 geführt. Das aus dem Gleiskreis 1 ausgekoppelte Signal wird mit einem Tiefpass 11 gefiltert und bildet den Signaleingang sowohl des Synchrongleichrichters 7 als auch des Synchrongleichrichters 7.1. In den Synchrongleichrichtern 7 und 7.1 werden die beiden den Eingang und den Ausgang des Gleiskreises 1 repräsentierenden Signale quasi überlagert, so dass über die nachgeschalteten Tiefpassfilter 9 und 9.1 vom Controller 4 auszuwertende Korrelationsspannungen Ukorrelation und Ukorrelation + 90° erzeugt werden. Dazu führt der Controller 4 mit dem Satz des Pythagoras eine Betragswertberechnung der Korrelationsspannung aus.Shown is a track circuit 1, which forms a resonant circuit of inductance-forming rail portions 2a and 2b and a capacitor 3. In this track circuit 1 is an AF signal coupled with a frequency of 20 to 30Hz. Serves a controller 4, which is connected via a frequency generator 5 and an output stage 6 for amplifying the frequency signal to the track circuit 1. The frequency generator 5 which can be set by the controller 4 generates two digital output signals which are identical in magnitude but offset by 90 °. The two output signals f Osz and f Osz + 90 ° are returned to the controller 4 for verification and also form the control signal for two synchronous rectifiers 7 and 7.1, which are connected via low-pass filters 9 and 9.1 to the controller 4. The signal to be injected into the track circuit 1 is also fed to the controller 4 via a peak value rectifier 10. The decoupled from the track circuit 1 signal is filtered with a low-pass filter 11 and forms the signal input of both the synchronous rectifier 7 and the synchronous rectifier 7.1. In the synchronous rectifiers 7 and 7.1, the two signals representing the input and the output of the track circuit 1 are virtually superimposed, so that correlation voltages U correlation and U correlation + 90 ° to be evaluated by the controller 4 are generated via the downstream low-pass filters 9 and 9.1. For this purpose, the controller 4 carries out an absolute value calculation of the correlation voltage with the Pythagorean theorem.

Um die vom Frequenzgenerator 5 gebildeten Steuersignale fOsz und fOsz + 90° für die Synchrongleichrichter 7 und 7.1 zu überprüfen, können diese direkt auf den Controller 4 geführt werden. Vorzugsweise werden jedoch die beiden Steuersignale fOsz und fOsz + 90° mittels eines Exklusiv/Oder-Gatters 12 verknüpft, wobei das dabei entstehende Signal 2fOszIst auf den Controller 4 geschaltet ist. Die Steuersignale fOsz und fOsz + 90° wurden korrekt erzeugt, wenn der Controller 4 die doppelte Gleiskreisfrequenz 2fOszISt feststellen kann. Dabei muss das Tastverhältnis 50% betragen, damit ein Phasenfehler ausgeschlossen werden kann. Da Controller einfacherer Bauart dieses Tastverhältnis nicht selbst überprüfen können, ist von dem Exklusiv/Oder-Gatter 12 in diesem Fall eine Einrichtung zur Tiefpassfilterung 13 abgezweigt, wodurch ein Spannungs-Ausgangsssignal UPhase erzeugt wird, dass der Controller 4 auswerten kann. Beträgt UPhase genau das Mittel zwischen der Spannung eines logischen high und eines logischen low, ist ein Tastverhältnis von 50% nachgewiesen.In order to check the control signals f Osz and f Osz + 90 ° formed by the frequency generator 5 for the synchronous rectifiers 7 and 7.1, they can be fed directly to the controller 4. Preferably, however, the two control signals f osz and f osc + 90 ° are linked by means of an exclusive / OR gate 12, wherein the resulting signal is 2f OszIst connected to the controller 4. The control signals f Osz and f Osz + 90 ° have been generated correctly when the controller 4 can detect the double track frequency 2f OszISt . The duty cycle must be 50%, so that a phase error is excluded can be. Since controllers of simpler design can not check this duty cycle by itself, in this case a device for low-pass filtering 13 is branched off from the exclusive OR gate 12, whereby a voltage output signal U phase is generated, which the controller 4 can evaluate. If U phase is exactly the mean between the voltage of a logical high and a logical low, a duty cycle of 50% is proven.

Letztlich erzeugt der Controller 4 aus den Korrelationsspannungen Ukorrelation und Ukorrelation + 90° durch phasenunabhängige Betragswertermittlung ein Ausgangssignal, das eine Frei- oder Besetztmeldung 14 des betrachteten Gleisabschnittes ansteuert. Außerdem kann der Controller 4 mit einem Diagnosemodul 15, welches bestimmte Parameter abfragt und/oder einer Diagnoseeinrichtung 16, welche Controllerzustände auswertet, verbunden sein.Finally, the controller 4 generates from the correlation voltages U correlation and U correlation + 90 ° by phase-independent absolute value determination an output signal which activates a free or busy message 14 of the considered track section. In addition, the controller 4 may be connected to a diagnostic module 15, which polls certain parameters and / or a diagnostic device 16, which evaluates controller states.

Claims (6)

  1. Circuit arrangement for monitoring the occupancy state of a switch or of a track section by means of a track circuit (1), wherein, when a rail vehicle is travelling on the track circuit (1) a resultant attenuation and resonant-frequency change can be detected, having a synchronous rectifier (7) for correlation of signals which are injected into the track circuit (1) with signals which are emitted from the track circuit (1), which synchronous rectifier (7) is connected via a low-pass filter (9) to a controller (4) for evaluation of the correlation signal, wherein the controller (4) acts on a frequency generator (5) whose output signal can be injected into the track circuit (1) via an output stage (6),
    characterized
    in that the frequency generator (5) produces a first control signal (fosc) and a second control signal (fosc+90°) which is offset through 90° in respect to the first, with the first control signal (fosc) being passed to a control input of the synchronous rectifier (7) and with the second control signal (fosc+90°) being passed to a control input of a second synchronous rectifier (7.1) which is connected to the controller (4) via a second low-pass filter (9.1), and with signal inputs of the synchronous rectifier (7, 7.1) being connected to the signal which is emitted from the track circuit (1) via a low-pass filter (11), and
    in that the first and the second control signal (fosc and fosc+90°) are passed via an exclusive OR gate (12) to the controller (4), with the controller (4) having means for checking the correct formation of the control signals (fosc and fosc+90°)
  2. Circuit arrangement according to Claim 1,
    characterized
    in that the first and the second control signal (fosc and fosc+90°) are additionally passed directly to the controller (4), with the controller (4) having means for checking the correct formation of the control signals (fosc and fosc+90°).
  3. Circuit arrangement according to one of the preceding claims,
    characterized
    in that the exclusive OR gate (12) is connected to the controller (4) via a low-pass filter (13).
  4. Circuit arrangement according to one of the preceding claims,
    characterized
    in that the controller (4) is connected to a diagnosis module (15) which has means for detection of aging-dependent and/or temperature-dependent changes in the phase angle of the first and/or second control signal (fosc and/or fosc+90°).
  5. Circuit arrangement according to one of the preceding claims
    characterized
    in that an analogue multiplier is provided instead of at least one synchronous rectifier (7, 7.1) and is driven by an analogue signal produced by the frequency generator (5).
  6. Circuit arrangement according to one of the preceding claims,
    characterized
    in that a PLL (phase locked loop) element is provided for frequency stabilization, instead of the frequency generator (5).
EP06117115A 2005-07-20 2006-07-13 Circuit for monitoring the occupancy of points or of a track section Not-in-force EP1746008B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005034640A DE102005034640B4 (en) 2005-07-20 2005-07-20 Circuit arrangement for monitoring the occupancy state of a switch or a track area

Publications (3)

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EP1746008A2 EP1746008A2 (en) 2007-01-24
EP1746008A3 EP1746008A3 (en) 2007-09-19
EP1746008B1 true EP1746008B1 (en) 2009-06-03

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Application Number Title Priority Date Filing Date
EP06117115A Not-in-force EP1746008B1 (en) 2005-07-20 2006-07-13 Circuit for monitoring the occupancy of points or of a track section

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EP (1) EP1746008B1 (en)
AT (1) ATE432859T1 (en)
DE (2) DE102005034640B4 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101830239B (en) * 2010-03-02 2012-04-18 王国荣 Intelligent shunt circuit for section track and route type piecewise unlocking method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2623967C3 (en) * 1976-05-28 1979-09-20 Standard Elektrik Lorenz Ag, 7000 Stuttgart Phase-synchronously controlled track circuit receiver
DE3333298C2 (en) * 1983-09-15 1985-11-28 Standard Elektrik Lorenz Ag, 7000 Stuttgart Track circuit receiver with phase adjustment
DE4025194A1 (en) * 1990-08-09 1992-02-13 Standard Elektrik Lorenz Ag TRACK CIRCUIT WITH CROSS CORRELATION
US7254467B2 (en) * 2003-02-13 2007-08-07 General Electric Company Digital train system for automatically detecting trains approaching a crossing
DE10320680A1 (en) * 2003-04-30 2004-12-02 Siemens Ag Circuit arrangement for monitoring the occupancy status of a switch or a track area

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Publication number Publication date
ATE432859T1 (en) 2009-06-15
DE102005034640A1 (en) 2007-02-15
DE102005034640B4 (en) 2007-05-03
DE502006003863D1 (en) 2009-07-16
EP1746008A3 (en) 2007-09-19
EP1746008A2 (en) 2007-01-24

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