EP0282932A2 - Circuit de voie modulé en fréquence - Google Patents

Circuit de voie modulé en fréquence Download PDF

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Publication number
EP0282932A2
EP0282932A2 EP19880103941 EP88103941A EP0282932A2 EP 0282932 A2 EP0282932 A2 EP 0282932A2 EP 19880103941 EP19880103941 EP 19880103941 EP 88103941 A EP88103941 A EP 88103941A EP 0282932 A2 EP0282932 A2 EP 0282932A2
Authority
EP
European Patent Office
Prior art keywords
frequency
track
track circuit
bandpass filter
modulated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19880103941
Other languages
German (de)
English (en)
Other versions
EP0282932A3 (en
EP0282932B1 (fr
Inventor
Helmut Uebel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent Deutschland AG
Original Assignee
Alcatel SEL AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel SEL AG filed Critical Alcatel SEL AG
Publication of EP0282932A2 publication Critical patent/EP0282932A2/fr
Publication of EP0282932A3 publication Critical patent/EP0282932A3/de
Application granted granted Critical
Publication of EP0282932B1 publication Critical patent/EP0282932B1/fr
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Classifications

    • 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
    • B61L1/188—Use of coded current

Definitions

  • the invention relates to a track circuit according to the preamble of claim 1.
  • Electronically controlled drives of rail vehicles especially chopper or phase control, generate an extensive harmonic spectrum in the drive current.
  • the drive reverse current flowing through the rails can disrupt track circuits; in the worst case, it is even conceivable that a track section is incorrectly released.
  • the operational safety of track circuits can be increased by using coded track circuits.
  • the track currents of AC-powered track circuits can be modulated, for example, in amplitude, phase or frequency. With the aid of the modulation, coding can be transferred from the track circuit transmitter to the track circuit receiver.
  • the Track circuit receiver checks the coding in addition to the track voltage level and only reports the corresponding track section if it is correct. Normally, the electronic drives of the traction vehicles cannot replicate this coding, so that an incorrect track vacancy detection is excluded.
  • a circuit arrangement for operating a frequency-modulated, coded track circuit is known, for example, from the journal Signal und Draht 74 (1982), 7/8, pages 151 to 160.
  • a certain bit pattern is generated in the track circuit transmitter, which is supplied as a frequency-modulated signal to the rail section to be monitored.
  • the transmitter emits an upper or lower cut-off frequency when a bit with the logic state 1 or 0 is present.
  • the track circuit receiver demodulates the track voltage and compares the bit pattern with a stored target bit pattern. If the target bit pattern corresponding to the transmitted bit pattern corresponds, a track vacancy signal is issued. If the level of the received signal is too low or the bit patterns do not match, the track section remains reported as occupied.
  • a disadvantage of the known circuit arrangement is that the realization of the track circuit receiver is complex because of the required, signal-technically reliable checking of the bit pattern.
  • a bandpass filter must be used in the receiver, the bandwidth of which is greater than the frequency swing of the track voltage and which, in order to avoid disturbing amplitude modulation at the output of the filter, has an approximately linear frequency response within its bandwidth.
  • the relatively large filter bandwidth means that the track circuit is susceptible to faults. Even if the malfunctions due to the code check no longer cause false free messages, they can reduce the availability of the track circuit.
  • the invention has for its object to provide a frequency-modulated track circuit that works interference-free and is constructed much simpler than the aforementioned known track circuit.
  • the circuit arrangement according to the invention is characterized in that simple known and proven devices such as e.g. the tube track relay (see e.g. DE-PS 10 98 982, in particular Fig. 1) can be used, which only need to be supplemented by the bandpass filter on the input side.
  • a frequency generator that can be modulated in frequency and is controlled by a code generator is used as the track current circuit transmitter. Tracking the center frequency of the bandpass filter allows the use of an extremely narrow-band bandpass filter, as a result of which the entire arrangement can hardly be disturbed.
  • the drawing shows the block diagram of a circuit arrangement for track vacancy detection of a double-rail insulated track section 4 using a conventional tubular track relay 8.
  • the track current circuit transmitter 2 has a modulation input ME and a track voltage output GA.
  • a code generator 1 is connected to its modulation input ME as a modulator, while its track voltage output GA is connected to a feed point 3 of a track section 4.
  • the tubular track relay 8 has a mains voltage input NE and a track voltage input GE as well as an output GF for track vacancy detection and an output GB for track occupancy reporting.
  • the signals of the outputs can e.g. be displayed in a signal box.
  • the mains voltage input NE of the tubular track relay 8 receives its voltage from the track voltage output GA of the track current circuit transmitter 2 via a connection 9. For this purpose, this voltage must have a level sufficient for the operation of the tubular track relay.
  • the track voltage at an exit point 5 of the track section 4 passes via a low-pass filter 6 to the signal input SE of a comb filter 7 and from its signal output SA to the track voltage input GE of the tubular track relay 8.
  • the comb filter 7 additionally has a reference voltage input RE, which is connected to the track voltage output GA of the track circuit transmitter 2 connected is.
  • the proven tubular track relay used in systems of the Deutsche Bundesbahn can be used as the tubular track relay 8. This emits a track vacancy signal at its output GF when the voltage at its track voltage input is a predetermined one Threshold value is exceeded and its phase does not deviate by more than 15 ° from the voltage at the mains input. If the voltage at the track voltage input is below the threshold, a track occupancy message is issued at the GB output. If the two voltages at the NE and GE inputs have a phase difference of more than 15 °, interference voltages reach the GE input or the tube track relay 8 has an internal defect, either the simultaneous output of a free and a busy message takes place or none of them Outputs activated. The latter two states are to be interpreted as a fault.
  • a circuit as described, for example, in the magazine Electronics, November 22, 1973, pages 118 to 119, or any other clocked filter can be used as the comb filter 7.
  • Such a circuit requires an external reference frequency which corresponds to the desired center frequency f0 of the filter.
  • Comb filters have a comb-shaped frequency response, where there are maxima at integer multiples of the center frequency f0, so their frequency response continues periodically. Depending on the design of the comb filter, the reference frequency must first be multiplied.
  • the use of the transmitter output voltage or a voltage that is altered in height, with its frequency and in phase voltage, to operate the tube track relay and as a reference for the adjustable comb filter enables the receiver to be designed to be very narrowband, because by modulating the transmitter center frequency and the reference frequency of the transmitter together Comb filter eliminates the need to receive a frequency band that is wider than the frequency swing.
  • a very narrow-band receiver as can be achieved by connecting a comb filter, is practically no longer disruptive.
  • the filter settling time which is known to be long for narrow-band filters, prevents a response to higher-frequency interference. Otherwise, it is hardly noticeable, since the comb filter is not clocked, but only changed in frequency in accordance with the modulation signal. Only when the filter input voltage changes in amplitude, as occurs when the track section is occupied or cleared, can the large settling time appear with a delay. However, with a permitted 1 delay of 0.5 s when the track section is occupied or cleared, it is still possible to set the bandwidth of the comb filter to 1 Hz.
  • Interferences that could also be caused by integer multiples of the filter center frequency are caused by the low-pass or band-pass filter 6 connected upstream of the comb filter, which has an upper limit frequency of 1.5 times the comb filter center frequency and all higher multiples of the comb filter Center frequency blocked, switched off.
  • An additional gain in interference immunity can be achieved in that the track circuit frequency is not generated independently of the drive circuit, but is in a fixed, non-integer ratio to the drive current frequency. This prevents accidental correspondence between the track circuit frequency and the harmonics of the drive current frequency.

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Circuits Of Receivers In General (AREA)
  • Amplitude Modulation (AREA)
  • Details Of Television Scanning (AREA)
  • Transmitters (AREA)
  • Amplifiers (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Superheterodyne Receivers (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
EP88103941A 1987-03-18 1988-03-12 Circuit de voie modulé en fréquence Expired - Lifetime EP0282932B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873708788 DE3708788A1 (de) 1987-03-18 1987-03-18 Frequenzmodulierter gleisstromkreis
DE3708788 1987-03-18

Publications (3)

Publication Number Publication Date
EP0282932A2 true EP0282932A2 (fr) 1988-09-21
EP0282932A3 EP0282932A3 (en) 1989-12-06
EP0282932B1 EP0282932B1 (fr) 1996-07-10

Family

ID=6323367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88103941A Expired - Lifetime EP0282932B1 (fr) 1987-03-18 1988-03-12 Circuit de voie modulé en fréquence

Country Status (6)

Country Link
EP (1) EP0282932B1 (fr)
AT (1) ATE140194T1 (fr)
DE (2) DE3708788A1 (fr)
ES (1) ES2091745T3 (fr)
TR (1) TR24261A (fr)
YU (1) YU53188A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010100055A1 (fr) * 2009-03-02 2010-09-10 Siemens Aktiengesellschaft Dispositifs permettant de détecter si un tronçon de voie est libre ou occupé et procédés pour faire fonctionner de tels dispositifs

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19816581A1 (de) * 1998-04-08 1999-10-21 Siemens Ag Zugbeeinflussungseinrichtung
DE102007030598A1 (de) * 2007-06-28 2009-01-15 Siemens Ag Verfahren und Vorrichtung zur Auswertung eines INDUSI-Signals

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2140381A1 (de) * 1970-08-13 1972-02-17 Gen Signal Corp Empfanger fur einen Frequenz modulier ten Uberlagerungs Gleisstromkreis
FR2121265A5 (fr) * 1971-01-05 1972-08-18 Int Standard Electric Corp
US4417229A (en) * 1980-10-15 1983-11-22 Safetran Systems Corporation Means for use on a railroad to distinguish between traction current and signal current
DE3325249A1 (de) * 1983-07-13 1985-01-31 Standard Elektrik Lorenz Ag, 7000 Stuttgart Gleisstromkreisempfaenger
DE3403946A1 (de) * 1984-02-04 1985-08-08 Standard Elektrik Lorenz Ag, 7000 Stuttgart Gleisfreimeldeeinrichtung mit gleisstromcodierung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2140381A1 (de) * 1970-08-13 1972-02-17 Gen Signal Corp Empfanger fur einen Frequenz modulier ten Uberlagerungs Gleisstromkreis
FR2121265A5 (fr) * 1971-01-05 1972-08-18 Int Standard Electric Corp
US4417229A (en) * 1980-10-15 1983-11-22 Safetran Systems Corporation Means for use on a railroad to distinguish between traction current and signal current
DE3325249A1 (de) * 1983-07-13 1985-01-31 Standard Elektrik Lorenz Ag, 7000 Stuttgart Gleisstromkreisempfaenger
DE3403946A1 (de) * 1984-02-04 1985-08-08 Standard Elektrik Lorenz Ag, 7000 Stuttgart Gleisfreimeldeeinrichtung mit gleisstromcodierung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010100055A1 (fr) * 2009-03-02 2010-09-10 Siemens Aktiengesellschaft Dispositifs permettant de détecter si un tronçon de voie est libre ou occupé et procédés pour faire fonctionner de tels dispositifs
CN102341290A (zh) * 2009-03-02 2012-02-01 西门子公司 用于探测轨道段的占用或空闲状态的装置以及用于运行这样的装置的方法
US8613410B2 (en) 2009-03-02 2013-12-24 Siemens Aktiengesellschaft Devices for detecting the occupied state or the free state of a track section and method for operating such devices
CN102341290B (zh) * 2009-03-02 2015-04-29 西门子公司 用于探测轨道段的占用或空闲状态的装置以及用于运行这样的装置的方法

Also Published As

Publication number Publication date
EP0282932A3 (en) 1989-12-06
DE3708788A1 (de) 1988-09-29
ATE140194T1 (de) 1996-07-15
ES2091745T3 (es) 1996-11-16
TR24261A (tr) 1991-07-29
EP0282932B1 (fr) 1996-07-10
DE3855407D1 (de) 1996-08-14
YU53188A (en) 1990-12-31

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