EP0013521B1 - Dispositif d'émission pour circuits de voie codés - Google Patents

Dispositif d'émission pour circuits de voie codés Download PDF

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Publication number
EP0013521B1
EP0013521B1 EP79401028A EP79401028A EP0013521B1 EP 0013521 B1 EP0013521 B1 EP 0013521B1 EP 79401028 A EP79401028 A EP 79401028A EP 79401028 A EP79401028 A EP 79401028A EP 0013521 B1 EP0013521 B1 EP 0013521B1
Authority
EP
European Patent Office
Prior art keywords
frequency
information
track
modulation
transmitted
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.)
Expired
Application number
EP79401028A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0013521A1 (fr
Inventor
Claude Bilet
Michel Guillard
Dominique Hedoin
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.)
Compagnie de Signaux et dEntreprises Electriques SA
Original Assignee
Compagnie de Signaux et dEntreprises Electriques SA
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 Compagnie de Signaux et dEntreprises Electriques SA filed Critical Compagnie de Signaux et dEntreprises Electriques SA
Priority to AT79401028T priority Critical patent/ATE7007T1/de
Publication of EP0013521A1 publication Critical patent/EP0013521A1/fr
Application granted granted Critical
Publication of EP0013521B1 publication Critical patent/EP0013521B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L3/00—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal
    • B61L3/16—Continuous control along the route
    • B61L3/22—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation
    • B61L3/24—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation employing different frequencies or coded pulse groups, e.g. in combination with track circuits
    • B61L3/246—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation employing different frequencies or coded pulse groups, e.g. in combination with track circuits using coded current
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
    • B61L23/08—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in one direction only
    • B61L23/14—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in one direction only automatically operated
    • B61L23/16—Track circuits specially adapted for section blocking
    • B61L23/168—Track circuits specially adapted for section blocking using coded current

Definitions

  • the present invention relates to a transmission device for coded track circuits, allowing in particular the transmission of information to a vehicle traveling on a railway track divided into a succession of cantons each equipped with a track circuit, each carrier frequency excitation of the track circuits being frequency modulated by a number of modulation frequencies each representing information to be transmitted; a first generator from which the modulation frequency is produced corresponding to the information to be transmitted, a second generator from which a so-called control frequency is produced, a pilot whose carrier frequency is modulated by said modulation frequency, a demodulator and an analog gate to which the modulated carrier frequency from the pilot is simultaneously applied, and a comparator mixer for comparing the frequency from the demodulator to the control frequency, this comparator mixer controlling, if necessary, the opening of the analog gate so to allow the transmission of the modulated carrier frequency to the corresponding track circuit.
  • these signals are generally automatically controlled by safety devices, known as track circuits, which ensure safety by blocking, the track being divided into a succession of cantons each equipped with a circuit of track.
  • track circuits which ensure safety by blocking, the track being divided into a succession of cantons each equipped with a circuit of track.
  • the cantonment must take into account the length of the trains, the speed of the fastest trains and the particularities of the track, in order to guarantee the safety of spacing between the successive vehicles.
  • the track circuit consists of a transmitting member and a receiving member, connected to the rails constituting the track, so that the presence of a shunt axle located between the point d transmission and reception point of the channel causes the de-excitation of a relay associated with the receiver.
  • the signals transmitted in one of the track circuits cannot inadvertently excite the receiver of a neighboring track circuit, hence the need to limit the propagation of signals in each track circuit. This can be done for example by using different frequencies or polarities for two consecutive track circuits and by limiting the propagation by insulating joints or by circuits equivalent to short-circuits between the rails for the frequencies whose frequency is to be limited. spread.
  • Such a method of coding track circuits is described for example in French patent n ° 7,000,325 filed on January 7, 1970 in the name of the applicant company and published under n ° 2076219.
  • the modulation frequencies are very low so that the modulation index is sufficiently high and in a particular application, the excitation frequencies of the track circuits are of the order of a kilohertz, while the modulation frequencies are of the order of ten hertz.
  • a set of frequency comparators with two inputs is used to control the modulation frequencies, each input receiving respectively the modulation frequency developed from a first generator and a control frequency developed from a second independent generator. If the frequencies compared differ, no information is transmitted to the channel.
  • the main object of the present invention is therefore to remedy this drawback and, to do this, it relates to a transmission device of the aforementioned type which is essentially characterized in that the control frequency has a constant frequency offset with the modulation frequency, regardless of the information to be transmitted, the comparator mixer being common to the different frequency pairs and essentially consisting of a selective filter sensitive to said frequency offset.
  • the modulation frequency and the control frequency are developed from the corresponding generators, by means of programmable dividers whose division factor is a function of the information to be transmitted.
  • the programmable divider associated with the first generator is followed by a divider whose fixed division factor is equal to a power of two, while a multiplier whose multiplication factor is equal to the same power of two is interposed between the demodulator and the comparator mixer.
  • the transmission device according to the invention is produced in the form of two distinct modules, one is assigned to the coding and to the control of the information to be transmitted, while the other is assigned to the transmission itself.
  • the transmission module being capable of being used independently of the coding and control module when it is not necessary to transmit information to vehicles traveling on the track.
  • FIG. 1 one can see a portion of railway track V formed by two rows of rails r 1 and r 2 .
  • This railway track is equipped with successive track circuits CV 1 , CV 2 , etc., excited by two different frequencies F i and F 2 , for example 1,700 Hz and 2,300 Hz, which repeat alternately throughout along the way.
  • Successive track circuits are isolated from each other by conventional insulating joints such as J, or by circuits equivalent to short circuits for the frequencies considered.
  • each track circuit comprises at one end a transmitter E of frequency F 1 or F 2 and at the other end a suitable receiver RF 1 or RF 2 .
  • the device according to the present invention essentially aims to allow the transmission of information to vehicles such as L, generally a locomotive, traveling on track V in the direction indicated by the arrow F.
  • each of the excitation frequencies of the track circuits is frequency modulated by a number of very low fixed modulation frequencies, each representing one of the pieces of information to be transmitted to the vehicle. If, for example, there are seven different pieces of information to transmit, these modulation frequencies may advantageously be between 12 Hz and 20 Hz.
  • the modulation index is then relatively high. If we take for example a frequency excursion of ⁇ 10 Hz, we will have a modulation index between 0.5 and 0.8.
  • the carrier frequencies of 1,700 Hz and 2,300 Hz no longer appear in the track circuits. Indeed, with a frequency excursion equal to ⁇ 10 Hz, we will have for example in a determined track circuit, either 1 690 Hz or 1 710 Hz, and this at the rate of the modulation frequency used at this time , while in the two adjacent track circuits, there will be either 2 290 Hz or 2 310 Hz, always at the rate of the modulation frequency.
  • the means allowing, on board the locomotive L, to pick up and detect the modulated frequencies generated in the successive track circuits, in order to extract the information from them, essentially consist of a sensor C placed in the vicinity of track V, preferably at equal distance from the two rows of rails r 1 and r 2 , followed by a receiver R similar to those fitted to the track circuits.
  • This transmission device E is shown in a synoptic manner in FIG. 2 and firstly comprises a pilot generator 1 from which the modulation frequency of the carrier is produced at 1,700 Hz or 2,300 Hz.
  • This generator by quartz example, is designed to generate a fixed and stable frequency which is then divided into a programmable divider 2 whose division factor is a function of the information to be transmitted.
  • the single command by all or nothing, is applied to one of the inputs A to N of a coding matrix 3, these inputs A to N representing the different information likely to be transmitted by the system and which can be easily from 20 to 30 as required.
  • the matrix 3 then supplies the programmable divider 2, depending on the input terminal A, B or N which is activated, with a logic signal determining the division factor which will be applied to the signal from the pilot generator 1.
  • the programmable divider 2 is followed by an amplifier 4 serving as a separator stage and a divider 5 whose fixed division factor is equal to 2 ".
  • This additional divider 5 is made necessary by the fact that the modulation frequencies used in the device according to the invention are very low, of the order of ten Hertz, as we have seen above.
  • the frequency from divider 5 constitutes the modulation frequency representing the information to be transmitted, and it is applied to a pilot 6 in order to modulate the carrier at 1,700 Hz or 2,300 Hz produced by this pilot.
  • This modulated signal is applied simultaneously to a demodulator 7 and to an analog gate 8 whose role will appear more clearly later.
  • the demodulator 7 detects the modulation frequency of the signal leaving the pilot 6 and this frequency is then multiplied in a multiplier 9 whose multiplication factor is equal to 2 ", so that the frequency of the signal appearing at the output of this multiplier is normally equal to that of the output signal from the programmable divider 2.
  • the transmission device E further comprises a control generator 10 from which a so-called control frequency is produced.
  • This generator 10 which can also be quartz like the generator 1, is designed to generate a fixed and stable frequency which is then applied to another programmable divider 11 associated with a second coding matrix 12 analogous to the matrix 3.
  • this coding matrix 12 As a function of the input terminal A, B or N which is activated by the single command, this coding matrix 12 generates a logic signal which determines the division factor of the programmable divider 11.
  • this division factor is such that the frequency of the signal from the divider 11 has a constant frequency offset, for example 1000 Hz, with the frequency of the signal from the divider 2.
  • the signal from the divider 11 should normally have the same frequency offset with the signal from the multiplier 9.
  • This is controlled in a comparator mixer 13 to which the two signals are simultaneously applied.
  • this comparator mixer could simply be constituted by a selective filter sensitive to said frequency offset, ie 1000 Hz for example.
  • the analog gate 8 is followed by a power amplifier 14 and an adjustable dummy line 15 playing the role of adapter.
  • the output terminal S of the device can thus be connected to the rails of the track by a cable of any length, depending on the installation conditions which are obviously very variable depending on the lines.
  • the information provided by the coding device according to the invention can also be used independently of the track-machine link, when it is desired, for example, to reinforce the selectivity of the track circuit receivers. Most of the time, however, such information is useless when there is no track-machine link.
  • the transmission device E is produced in the form of two separate modules MC and ME.
  • the module MC is assigned more specifically to the coding and the control of information, and includes all the elements necessary for these functions, while the module ME is assigned to the transmission itself.
  • the transmission module ME thus consists of the divider 5, the pilot 6, the analog gate 8, the power amplifier 14 and the dummy line 15.
  • This module is also capable of operating independently of the module MC. In fact, it suffices for this to directly connect the input terminal a of the divider 5 to a particular output terminal p of the pilot 6 and to connect directly the normal output y of this same pilot to the input terminal 8 of the analog gate 8. These two connections are illustrated by dotted lines in FIG. 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Air Bags (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Dc Digital Transmission (AREA)
  • Error Detection And Correction (AREA)
  • Alarm Systems (AREA)
EP79401028A 1978-12-22 1979-12-17 Dispositif d'émission pour circuits de voie codés Expired EP0013521B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79401028T ATE7007T1 (de) 1978-12-22 1979-12-17 Sendervorrichtung fuer kodierte gleisstromkreise.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7836270 1978-12-22
FR7836270A FR2449575A1 (fr) 1978-12-22 1978-12-22 Procede de codage de securite pour circuits de voie

Publications (2)

Publication Number Publication Date
EP0013521A1 EP0013521A1 (fr) 1980-07-23
EP0013521B1 true EP0013521B1 (fr) 1984-04-11

Family

ID=9216501

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79401028A Expired EP0013521B1 (fr) 1978-12-22 1979-12-17 Dispositif d'émission pour circuits de voie codés

Country Status (10)

Country Link
US (1) US4349170A (enrdf_load_stackoverflow)
EP (1) EP0013521B1 (enrdf_load_stackoverflow)
JP (1) JPS5590153A (enrdf_load_stackoverflow)
AT (1) ATE7007T1 (enrdf_load_stackoverflow)
AU (1) AU533947B2 (enrdf_load_stackoverflow)
BR (1) BR7908505A (enrdf_load_stackoverflow)
DE (1) DE2966897D1 (enrdf_load_stackoverflow)
ES (1) ES487572A1 (enrdf_load_stackoverflow)
FR (1) FR2449575A1 (enrdf_load_stackoverflow)
ZA (1) ZA796773B (enrdf_load_stackoverflow)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3040080C1 (de) * 1980-10-24 1987-11-12 Standard Elektrik Lorenz Ag, 7000 Stuttgart Einrichtung zur signaltechnisch sicheren Datenuebertragung zwischen einer Trasse und auf dieser gefuehrten Fahrzeugen
GB8320509D0 (en) * 1983-07-29 1983-09-01 Westinghouse Brake & Signal Proving safe operation
IN161526B (enrdf_load_stackoverflow) * 1983-07-29 1987-12-19 Westinghouse Brake & Signal
GB8413324D0 (en) * 1984-05-24 1984-06-27 Westinghouse Brake & Signal Vehicle protection system
IT1225716B (it) * 1988-10-26 1990-11-22 Esacontrol Spa Dispositivo per la protezione dei rele' di binario dai disturbi elettrici
FR2639306B1 (fr) * 1988-11-18 1990-12-21 Alsthom Gec Systeme de transmission d'information d'initialisation, entre des installations fixes et des trains
RU2291806C1 (ru) * 2005-09-05 2007-01-20 Государственное образовательное учреждение высшего профессионального образования "Самарская государственная академия путей сообщения" (СамГАПС) Способ подключения приборов к рельсовой цепи

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB883279A (en) * 1958-08-06 1961-11-29 Ass Elect Ind Improvements relating to a.c. electric supply arrangements
US3268727A (en) * 1964-03-25 1966-08-23 Gibbs & Hill Inc Computer control for transit system
US3551889A (en) * 1967-05-11 1970-12-29 Westinghouse Electric Corp Remote signaling of control signals
US3748466A (en) * 1971-06-14 1973-07-24 Gen Signal Corp Vehicle control system
US3794833A (en) * 1972-05-25 1974-02-26 Westinghouse Air Brake Co Train speed control system
US3970271A (en) * 1975-03-27 1976-07-20 General Signal Corporation Dual frequency track circuit
US4002314A (en) * 1975-07-07 1977-01-11 Westinghouse Electric Corporation Train vehicle speed control signal providing apparatus
JPS52101512A (en) * 1976-02-20 1977-08-25 Hitachi Ltd Device for controlling operation of vehicle
DE2640756C2 (de) * 1976-09-10 1982-11-04 Standard Elektrik Lorenz Ag, 7000 Stuttgart Einrichtung zur gesicherten Datenübertragung bei spurgebundenen Fahrzeugen

Also Published As

Publication number Publication date
ZA796773B (en) 1980-12-31
FR2449575B1 (enrdf_load_stackoverflow) 1983-01-28
JPS6329457B2 (enrdf_load_stackoverflow) 1988-06-14
ES487572A1 (es) 1980-06-16
US4349170A (en) 1982-09-14
EP0013521A1 (fr) 1980-07-23
ATE7007T1 (de) 1984-04-15
JPS5590153A (en) 1980-07-08
DE2966897D1 (en) 1984-05-17
AU533947B2 (en) 1983-12-22
FR2449575A1 (fr) 1980-09-19
BR7908505A (pt) 1980-07-22
AU5407179A (en) 1980-06-26

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