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Device for transmitting information between a fixed location and a railway vehicle

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Publication number
US3588372A
US3588372A US3588372DA US3588372A US 3588372 A US3588372 A US 3588372A US 3588372D A US3588372D A US 3588372DA US 3588372 A US3588372 A US 3588372A
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Prior art keywords
loop
railway
crossed
rails
periodically
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Christian Jauquet
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ACEC
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ACEC
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B61RAILWAYS
    • B61LGUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L3/00Devices along the route for controlling devices on the vehicle or vehicle train, e.g. to release brake, to operate a warning signal
    • B61L3/16Continuous control along the route
    • B61L3/22Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation
    • B61L3/225Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation using separate conductors along the route

Abstract

THIS DISCLOSURE RELATES TO A PERIODICALLY CROSSED CABLE LOOP WHICH IS POSITIONED BETWEEN TWO RAILS OF A RAILWAY FOR PERMITTING THE EXCHANGE OF INFORMATION BETWEEN A CENTRAL LOCATION AND A RAILWAY VEHICLE. THE DISCLOSURE IS CHARACTERIZED BY THE FACT THAT ONLY ONE SIDE OF THE PERIODICALLY CROSSED CABLE LOOP PLACED IN THE AXIS OF THE RAILWAY IS COUPLED TO AN ANTENNA POSITIONED ON THE RAILWAY VEHICLE IN ORDER TO REDUCE INTERFERENCE. THE ANTENNA IS HORIZONTAL AND DISPOSED PERPENDICULARLY TO SAID ONE SIDE OF THE PERIODICALLY CROSSED CABLE LOOP AND SYMMETRICALLY WITH RESPECT THERETO.

Description

United States Patent Inventor Christian Jauquet Charleroi, Belgium Appl. No. 800,580

Filed Feb. 19, 1969 Patented June 28, 1971 Assignee Ateliers De Constructions Electriques De Charleroi (ACEC) Societe Anonyme Charleroi, Belgium Priority Feb. 21, 1968 Belgium P1154831 DEVICE FOR TRANSMITTING INFORMATION BETWEEN A FIXED LOCATION AND A RAILWAY VEIIICLE I Claim, 2 Drawing Figs.

Primary Examiner Kathleen H. Clafly Assistant Examiner-Williarn A. Helvestine AttorneyRaymond A Robic ABSTRACT: This disclosure relates to a periodically crossed cable loop which is positioned between two rails of a railway for permitting the exchange of infomnation between a central location and a railway vehicle. The disclosure is characterized by the fact that only one side of the periodically crossed cable loop placed in the axis of the railway is coupled to an antenna positioned on the railway vehicle in order to reduce interference. The antenna is horizontal and disposed perpendicularly to said one side of the periodically crossed cable loop and US. Cl. 179/82 Int. Cl H0411 5/00 Field of Search 1. 179/82 symmetrically with respect thereto.

1O 1 1 a 10 i W i ts I DEVICE FOR TRANSMITTING INFORMATION BETWEEN A FIXED LOCATION AND A RAILWAY VEHICLE This invention relates to a device for transmitting information between a fixed location and a railway vehicle.

Various devices are known permitting the exchange of information between a central location and a railway vehicle and the transmission of instructions to the vehicle in the case of automatic or semiautomatic operation thereof. These devices use, as a linking element, a cable forming a periodically crossed loop positioned between the two rails of the railway and one or more antennas positioned on the locomotive and coupled to the loop. Such a loop is usually fed by signals originating from a central location and comprises two conductors generally fixed on the upper portion of the base of the rails. The conductors are crossed at regular intervals in such a way as to form marking points where the phase of the signals is inverted, and the counting of these points permits to measure, aboard the locomotive, the distance travelled by the vehicle. The drawback of such a loop is that if two vehicles are located simultaneously on the same railway section between two crossings of the conductors, their axles form with the rails a closed circuit in which the loop induces currents which circulate. As this circuit is strongly coupled with the loop, the induced currents interfere with the flux of the loop in such a way that the transmission of information does not work anymore. To overcome this drawback, it has been suggested to reduce the coupling of the interfering circuit with the loop by moving the two conductors of the loop towards the center of the railway. In such a way, the interference is reduced but not completely and the transmission is appreciably impaired because of the narrowness of the loop.

The present invention overcomes all the above drawbacksv It concerns a loop ensuring a very good transmission of information and which is not sensible to disturbing circuits of the type disclosed above. It is characterized by the fact that only one of the sides of the loop, placed on the axis of the railway, is coupled to the antenna or to the ferrite antennas used on the locomotive, the antennas being horizontal and disposed perpendicularly to said side of the periodically crossed cable loop and symmetrically with respect thereto.

The invention will now be disclosed with reference to the accompanying drawings illustrating, by way of example, a preferred embodiment of the invention.

In the Drawings:

FIG. 1 illustrates a known'loop; and

FIG. 2 illustrates a loop in accordance with the invention.

FIG. ll of the drawings illustrates a periodically crossed cable loop, fed by signals originating from a central location, not shown, positioned between two rails 1 and 2 of a railway and comprising two conductors 3 and 4 constituting a cable generally secured to the upper portion of the base of the rails. The conductors 3 and 4 are crossed at regular intervals at points 5 in such a way as to form marking points where the phase of the signals is inverted, and the counting of these points permits to measure, aboard the locomotive, the distance travelled by the locomotive. If two railway vehicles are located simultaneously on the same section of the railway between two crossings of the loop, their axles 6 and 7 form with the rails l and 2 a closed circuit in which the loop induces currents which circulate as indicated. by the arrows. Because the circuit is strongly coupled to the loop, the induced currents interfere with the flux of the loop in such a way that the transmission of information does not work anymore.

The following description and FIG. 2 of the drawings relate to a particular embodiment of the invention. FIG. 2 illustrates a periodically crossed transmission loop consisting of two conductors 8 and 9 disposed between two rails 11 and 2 of a railway. These conductors are alternately crossed at points 10 for measuring the distance travelled by the train as disclosed above. One of the sides of the loop is secured to the base of the rail l and consequently strongly coupled magnetically to the rail 1. The other side of the loop is placed in the center of the railway at equal distances from each of the two rails. The

closed circuit formed by the two rails I and 2 and the two axles 6 and 7, which happen to be located simultaneously on the same section of the railway between two successive crossings 10 of the loop, is induced by the conductor 9 which produces in the two rails l and 2 currents which are equal and in opposition, and consequently have no action in the axis of the railway because they are at equal distances from the conductor 9. By placing on the locomotive a ferrite antenna 11 disposed horizontally, perpendicularly to conductor 8 and symmetrically with respect thereof, it is easy to see that such antenna will be influenced by the central conductor alone and that the closed circuit formed by the presence of the two axles 6 and 7 will not have any disturbing effect thereon.

The periodically crossed transmission loop may obviously be designed with marking points other than crossings without departing from the scope of the present invention.

1 claim:

ll. Transmission device between a fixed location and a railway vehicle including a cable forming a loop disposed between two rails of a railway and at least one antenna positioned on said vehicle and coupled to the loop, said loop having crossings at predetermined distances, characterized by the fact that one side of this periodically crossed cable loop is placed in the axis of the railway and coupled to said antenna located on the vehicle while the other side is secured to the base of one of the two rails, said antenna being horizontal and disposed perpendicularly to the side of the periodically crossed cable loop which is placed in the axis of the railway and symmetrically with respect to said side.

US3588372A 1968-02-21 1969-02-19 Device for transmitting information between a fixed location and a railway vehicle Expired - Lifetime US3588372A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BE54831 1968-02-21

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US3588372A true US3588372A (en) 1971-06-28

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3742150A (en) * 1971-04-28 1973-06-26 Mobility Sys Inc Inductively coupled data communication apparatus
US4012662A (en) * 1975-03-07 1977-03-15 Coal Industry (Patents) Limited Communication system between a transmitter, receiver station and a mobile station utilizing unidirectional amplifiers between parallel radiated transmission lines
US4041324A (en) * 1975-01-31 1977-08-09 Hitachi, Ltd. Magnetic shield system for electric cars
US5428363A (en) * 1992-09-28 1995-06-27 Texas Instruments Incorporated Antenna system for use in an automatic vehicular identification system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2347202C3 (en) * 1973-09-19 1981-09-24 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
DE19627343A1 (en) 1996-07-01 1998-01-08 Siemens Ag Means for self-locating of a track-guided vehicle

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3742150A (en) * 1971-04-28 1973-06-26 Mobility Sys Inc Inductively coupled data communication apparatus
US4041324A (en) * 1975-01-31 1977-08-09 Hitachi, Ltd. Magnetic shield system for electric cars
US4012662A (en) * 1975-03-07 1977-03-15 Coal Industry (Patents) Limited Communication system between a transmitter, receiver station and a mobile station utilizing unidirectional amplifiers between parallel radiated transmission lines
US5428363A (en) * 1992-09-28 1995-06-27 Texas Instruments Incorporated Antenna system for use in an automatic vehicular identification system

Also Published As

Publication number Publication date Type
DE1908400A1 (en) 1969-10-02 application
DE1908400B2 (en) 1973-10-25 application

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