US2206435A - Remote control system - Google Patents

Remote control system Download PDF

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Publication number
US2206435A
US2206435A US219978A US21997838A US2206435A US 2206435 A US2206435 A US 2206435A US 219978 A US219978 A US 219978A US 21997838 A US21997838 A US 21997838A US 2206435 A US2206435 A US 2206435A
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United States
Prior art keywords
relay
line
station
code
control
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 - Lifetime
Application number
US219978A
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English (en)
Inventor
Clarence S Snavely
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.)
Hitachi Rail STS USA Inc
Original Assignee
Union Switch and Signal Inc
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 Union Switch and Signal Inc filed Critical Union Switch and Signal Inc
Priority to US219978A priority Critical patent/US2206435A/en
Priority to GB16000/39A priority patent/GB529990A/en
Priority to FR857065D priority patent/FR857065A/fr
Application granted granted Critical
Publication of US2206435A publication Critical patent/US2206435A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
    • H04Q9/14—Calling by using pulses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
    • B61L27/20—Trackside control of safe travel of vehicle or train, e.g. braking curve calculation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L7/00—Remote control of local operating means for points, signals, or track-mounted scotch-blocks
    • B61L7/06—Remote control of local operating means for points, signals, or track-mounted scotch-blocks using electrical transmission
    • B61L7/08—Circuitry
    • B61L7/088—Common line wire control using series of coded pulses

Definitions

  • a iurther object is the provision of. line'ci-rcuits in which induced voltages from external. sources will be neutralized to a large e:- tentiand will not interfere with the proper operatic-n of the system.
  • One-feature of my invention is the provision of suitable repeater stations by means of which the code signals may be repeated. from'onecircuit to another as often as required, 7, g. Other objects and features of my invention will become apparent as the description proceeds.
  • the centralized traffice control system. embodying my invention includes apparatus at the control station, or dispatchers omce, for generating difierent series of code impulses arranged:iii-distinctive combinations, each such series constituting acode message. for selecting and controlling apparatus ata particular remote station, and thateach re-1 mote station is provided with apparatus which is generally similar to that at the control o'flice and. which when initiated will operate through a cycle to transmit a combination of code impulses for indicating at the ofilce the station oforigin andthe condition of devices at such station Myinvention is not restricted to the use" offcod'e generating and receiving apparatus of a specificform, but may be used with any'suit able system.
  • Fig. 1 is a diagrammatic View illustrating typical portions of. the line circuits of my invention, including the apparatus directly associated with the line cir-- cuits at the control office, at a repeater station,
  • Figs. 2 and 3 illustrate the local coding. apparatus at the control ofiice; and. at a field station, respectively,- this app'aratus being generally similar to the corresponding portions of the Lewis system.
  • Fig. 4. is a single line diagram whichillustrates one manner in which the line circuits of my in vention may be arranged to control apparatus situated along an extensive stretch. of railway track. of which only the two end portions are shown, It is to be understood that. in Fig. 4, the apparatusidentified by the reference 0 corresponds to the ofice equipment of Figs. 1 and 2, that identified by the references R I, R'2,
  • the apparatus of my invention is distinguished; by the employment of two normallyclosed line circuits in place of the single line-circuitof the Lewis application.
  • each line circuit has an auxiliary function, which comes into play when the other line circuit is in use, which is to lock out the transmitting apparatus at stations which have codes to transmit, so as to prevent interference with the station which is'transmitting a code.
  • my line signals are characterized by reversals of polarity as distinguished from closed and open intervals.
  • the codes are delivered'to the line circuit by the operation of pole-changer contacts, and are received by line relays R, each of which, it is to be understood, is of the two-position polarized type, so arranged that its contacts will remain in their last operated position when the relay is deenergized.
  • Each line circuit used for code transmission also includes at its battery end, a checking relay K of the neutral type, (a biased polar relay may also be used) each relay K becoming released to prevent further code transmission when the corresponding line circuit is opened, but remaining picked up during the operation of the associated pole changer during code transmission.
  • a checking relay K of the neutral type (a biased polar relay may also be used) each relay K becoming released to prevent further code transmission when the corresponding line circuit is opened, but remaining picked up during the operation of the associated pole changer during code transmission.
  • Relays having corresponding functions at the I office and stations are indicated by corresponding reference characters, the. oflice relays being distinguished by the prefix O, in each case.
  • the relay OM is the master relay of the ofiice coding unit, and is energized only for the duration of a control code and governs the transmission of such code, while relay OT is the transmitting relay' which by the operation of its pole-changing contacts b and d delivers the control codes to the control line circult.
  • the first section of the control line circuit may betraced from the left-hand or positive terminal of battery 9, at the office, back contact 11 of relay OM, left-hand contact a of the indication line relay IR, the upper winding of the control line relay OR, line wire XI, the windings of relay RI and contact a of relay KI at the repeater station, line wire X2, the lower winding of relay OR, contacts b of relays IR and OM, the winding of relay OK, to the right-hand terminal of battery 9;
  • the-second section of the control line circuit may be traced from battery II) atthe repeater station through the winding of relay KI and the pole-changer contacts a and b' of relay RI, line wires X3 and X4,
  • ovenbackcontacts b and 720i the station master relay M; line wires Y3 and Y4, front con tact a of relay K2 and back contact a'of'a slow acting repeater relay K2P in' multiple, the circuit being completed through the windings of the repeating line relay R2.
  • the polarity of battery I I is such that relay R2 "operates its contacts to the left as shown. h
  • the second section of the indication line circuit includes the battery I2, the winding of relay K2,
  • the indication line relay IR back contact i-of re lay OM and front contact 11 ofrelay OK at the oilice. held to the left, as shown, and therefore maintain normal polarity on the control line circuitj
  • the purpose of the line battery is to maintain relays R2 and IRene'rgize'd in their normal position when the equipment is at rest.
  • relay M at the transmitting station picks up and at its contacts I) and h disconnectsbattery I I and connects a local battery I2 over the pole-cha'nger contacts b and d of the associated transmitted relay T to that portionof the indication line which. extends toward, the ofi'ice, this portion including the winding of a checking relay K at the station.
  • the .coding unit therein illustrated is normally effective torespond selectively to indication codes delivered;by. the several field stations, and is rendered effective to deliver control' codes to the controlline a d- 9 si u a eo l e ste uch o 2 h
  • the contacts of relay IR' are normally R lay; OK, at its contact b, at the same time opens the relay OT, so that the line remains steadily ener gized by current of normal polarity.
  • Relay OLBP opens the circuits for those relays of the coding unit whichare energized, including relay OLI, and the latter relay; upon releasing, closes its back contact I) to condition the equipment for the transmission of another code.
  • Relay R is, of course, operated by the code in the'same manner as relay OR and the various local relays controlled by relay R operate in the same manner as the corresponding relays at the offlce on':each, step of the code, with certain exceptions which will now be pointed out.
  • the station apparatus is adapted to transmit codes as well as to receive them, the transmission of an indication code being initiated by picking up relay M over the circuit connected to terminal B at contact 0 of a starting relay ST, but this circuit is held open at contact b of relay LI or L2 when a control code is being received.
  • Relays Ll and L2 pick up in unison with the oflice relays OLI and 0L2, at the beginning of the code.
  • the indication line relay K was released by the opening of back contact 7 of the ofiice relay OM. It follows that when relay 1 picks up on the first step, a circuit is completed from terminal B over its front contact 0 and. back contact b of relay K to pick up relay E. Relay E is held energized for the duration of the control code, and opens its back contact 11 in the circuit for relay M.
  • relay M and OM Since the pick-up circuits for relays M and OM are controlled independently, it may happen that an indication code will be initiated by picking up thestation relay M at the same time that the office relay OM picks up, but if this occurs, relay M will be released on the first step by the operation of relay E and the transmission of a conflicting indication code by the station will be prevented, the station equipment being conditioned to receive the control code from the office by the operation of relay E.
  • Relays F, G and S are connected to different front contacts d of the stepping relays at the different stations in accordance with the code combination characteristics of the station. As shown in Fig. 3, these relays are connected to contacts d of relays 2, 3 and 4, respectively, so that this station as shown is responsive to the code No. 234
  • a delivery relay D is picked up in place of the
  • relay ST at its contact 0 closes the pick-upcircuit for relay M, which becomes energized and'disconnects the more remote stations from the indication line,
  • relay K completes a circuit from the line battery 1-2 through relay K for. temporarily maintaining relay R2 energized in its normal direction; Relays T and K now pick up;'and relay T reverses the polarity'of the indication linefor the first step repeater station, which in turn reverses the indication line relay IR at the ofllce.
  • Relay IR reverses the polarity of the control line, so that of the indication code, reversing relay R2 at the relays OR and RI reverse, and relay R! reverses the control-line relay R at the transmitting station.
  • relay OR picks up the correspondingoflice relays as in'the case of the control code already described.
  • relay- LBP at the transmitting'station picks up, a circuit is completed from terminal B over its front contact 1, front contact a of relay K to pick up relay KP, which relay 'is held energized for the duration'of the code over its own front contact a and back contact g of relay E, provided relay- Eremains deenergized.
  • relay ill will pick up if relays OM and M should happen to pick up at thesame time, in which case the ofiice will take:precedence over the static-n. Assuming, that this occur, it will be seenfrom Fig, 2 that relay OM does not.
  • Relay LBP' also opens the pickup cir cult for relay T-at its back contact use that relay '1' releases to terminate the first stepof theindi cation code shortly after relay KP picks up, re storing the polarity of the line circuits to normal and ELISO'PiCKlRg up relays'z and L2; Relay l releases, and closes the pick-up circuit for relay '1, but that relay is prevented from picking up because terminal Bis now connected to its lefthand terminal over a circuit including back contact b of relay F.
  • Relay Ll is now deenergized, and'when it releases, it closes a circuit at its back contact 2 to pick up relay F, permittlngrelay T to pick up to terminate the second step.
  • This action is similar to that already described in connection with the transmission or" a control code by the equipment of Fig. 2.
  • the action on the remaining steps is also similar, that is, relays G and S'plck up on the third and fourth steps,jinresponse to the release of relays L2 and L1 respectively, and control the holding circuits for relay T to prolong these steps of the "code, while on the remaining steps of the code relay ''1' is-*controlle'd only by its pick-41p circuit includin back contacts of the steppingrelays I, 3, and 1 so that these are short steps, in the code described.
  • Relay l picks up on the ninth step next inorder ai'ter relay 8, and energizes relay CB.
  • relays 2 to l, inclusive are operated'on steps nine to fifteen, respectively, relaylfi being operated, in place of relay 8 when the indication line becomes steadily energizedby' current of normal polarity at the fend-0t the code.
  • Relay it at its back contact deen'jer'gizes relay M, and also picks up a relayVP which at its irontcontact c connects terminal B to the l ft-hand terminal of relay '1 to'prevent further operation of that relay, and therefore relays M, L2, LP,LB, LBP, Ll release successively.
  • The-releas'e'ofrel'ay M places the indication line under the control of battery I I, re'storing'the line circuits to normal and releasing relay K.
  • Relay LBP releases the remaining local relays, as in the case "of the omce eduipment' already described.
  • relay K2 atthe repeater station at its front contact i controls.
  • a slow' acting repeater relay-KER When the indication line is opened by relay OM, at the beginning of a control code, releasing relay K2, relay K21 becomes deenergized and after a brief time interval releases to reestablish the continuity of the remote section of the indication line at itsback contact a. This results in maintaining the repeater station line relay R2 energized in its normal direction, so that when back contact 7' of relay OM closes at the end of the control code, relay IR at the office,
  • the purpose of the office relay OK'in thecontrol line is to prevent'coding in case the control line becomes open.
  • the transient charging currents produced by the repeated reversal of the line battery 9 by the polechanger contacts of relay OT may be sufficient to operate line relay OR, even though the line is open at its distant end. Since relay OR. is ofthe the local coding'circuits at its contact a and thereby prevent further transmission until the line is restored. I
  • the line relays are held in their operated positions substantially continuously by the current delivered to the line by the transmitter, and are therefore less subject to interference than when the coding is'effected by merely opening and closing the line, and the line relays are arranged with balanced windings so as to be immune to a large degree'to induced currents due to foreign sources.
  • the so-called bias distortion of the code signals is avoided. This term refers to a lack of symmetry in the waveform of the received code signals which may exist when the signals are produced by opening and closing along cable line circuit, or in case appreciable leakage of line current exists due to weatherconditions.
  • a code transmitter at the ofiice effective when initiatedto transmit a multiple impulse control code over said control line
  • a code transmitter at each station effective when initiated to transmit a multiple impulse indication code over said indication line
  • a repeating relay at the oifice having its winding included in said indication line and its contacts in said control line for repeating over the control line each indication code transmitted over the indication line
  • code responsive means at the office and at each station responsive to codes transmitted over the control line
  • lock-out means associated with each code-responsive means for preventing the operation of the associated code transmitter as long as a code' is being transmitted over the control line by another transmitter.
  • a transmitting station and a receiving station a normally energized line circuit including a source of current, and a pole-changer at the transmitting station; a neutral relay in said line circuit between said source and said pole-changer, a two-position polar line relay at the receiving station controlled in accordance with the polarity of the current supplied to said line circuit, means at the transmitting station effective only when said neutral relay is picked up by current delivered to said line circuit from said source for operating said pole-changer to reverse the polarity of the current supplied by said source at time-spaced in' tervals of variable length to operate said line relay in accordance with differentcodes, and code receiving means controlled by said line relay and selectively responsive to the relative lengths of said intervals in said codes.
  • a transmitting station and a receiving station a normally energized line circuit including a source of current and a pole-changer at the transmitting station; a neutral relay in said line circuit between said source and said pole-changer, a two-position polarline relay at the receiving station controlled in' accordance with the polarity of the current supplied to said line circuit, means at the transmitting station eifective only when said neutral relay is picked up by current delivered to said line circuit from said source for operating said pole-changer to reverse the polarity of the current supplied by said source at time-spaced intervals of variable length to operate said line relay in accordance with different 'codea'codc 'receiving'means controlled by.
  • said line relay and selectively responsive to the relative lengths of said intervals in said codes, and means at said receiving station for opening said line circuit to at times prevent the operation of said polechanger.
  • a normally energized control line having'aflrst portion including a source of current, a' first neutral relay and a pole-changer at the control station, and also including a two-position polar line relay at the repeater station, said line having a second portion-including a source of current, a second neutralirelay and a pole-changer controlled'by the line relay at said repeater sta-' tion andalso including'a two position polar line relay at the remote station; means effective only when the first neutralrelay is'picked up for operating the pole-changer at the control station to periodically reverse the polarity of the current supplied to said first section to operate said line relays in accordance with different codes, and means'controlled by the second neutral relay for opening the first section of the line circuit to prevent the operation of the pole-changer atthe control station in the event the second section of-the line circuit is opened.
  • a control sta tion and a remote station a line circuit including a source of current and a polarized'llne' relay at the control station, a second polarized line relay at the remote station controlled in accordance with the relative polarity of.
  • a master relay at the con trol station a first code transmitter at the con trol station controlled, from a remote point and effective only when said roaster relay'is 'd'eenergized to deliver codes of time spaced impulses of alternately opposite polarity; andof variable length to said line circuit, a second code transmitter at-the control station efiective only when saidmaster relay is energized to deliver different codes -ofytime spaced'impulses of alternately opposite polarity and of variable length to said line circuit, code responsive means at each station selectively; responsive to the relative lengths of the impulses of the codes received by said linerelays, and starting means at the control station for energizing said master relay 'effectivegonly when saidfirst code transmitter is not in operation.
  • a remote control systerrna control 'sta tion and a remote station; a normally closed line circuit including a source of current and a polarized linerelayat'the control station, a'sec- 0nd polarized line relay at the remote station controlled in accordance with the relative-po larity of energization'of said line circuit, amaster relay at the control station, a first code transmitter at the control station controlled from a remote point and effective only when said master relay is deenergized to deliver codes of time spaced impulses of alternately opposite pc larity-and' of variable length to said line circuit, a second code transmitter at the control station eifective only'when'said master relay is'energlzed to deliver different codes of time spaced impulses of alternately opposite polarity and of variable length to said line circuit, code responsive means at each station selectively responsive to the rela'-' tive lengths of the impulses of the codes received by said line relays, starting means 'at the
  • an ofiice and a station a normally closed line circuit including at the oflice a single current source and a first two-position polar line relay, a second two-position polar line relay at said station controlled in accordance with the relative polarity of the current supplied to said line circuit, a first and a second pole-changer at the office each effective when operated to reverse the polarity of the line current from said source at time spaced intervals to produce a code, code receivers at the ofiice and station each selectively responsive in accordance with the relative time spacing of successive operations of the associated line relay, means at the ofice for operating the first pole-changer repeatedly at selected time intervals of difierent lengths to deliver a code to the line circuit to which the station code receiver is responsive, and means at the station for operating the second pole-changer repeatedly at selected time intervals of different lengths to deliver a code to the line circuit to which the office code receiver is responsive.
  • a control line including a plurality of normally closed circuit portions, each including a two-position polar line relay at one end and a pole-changer and a source of current at the other end, a neutral relay in each portion between the pole-changer and source of current, code transmitting means at a control station for controlling the pole-changer for the first portion to deliver a code of time spaced reversals of current to said line, means controlled by the line relay for each except the last portion for controlling the pole-changer for the next succeeding portion to repeat said code, code responsive means controlled by the line relay for the last portion, and means including said neutral relays effective to stop the operation of the transmitting means in the event any one of said circuit portions becomes opened.
  • a remote control system two stations connected by a normally closed line circuit including a source of current at one station, a polechanger at one station efiective when actuated to reverse the polarity of the current delivered to said line circuit, a series of stepping relays, means controlled by said pole-changer for operating said stepping relays one at a time in order, one for each actuation of said pole-changer, means responsive to each successive operation of a stepping relay for actuating said pole-changer to thereby deliver a series of relatively short impulses of alternately opposite polarity to said line circuit, means at said one station controlled in accordance with a code for delaying the operation of the pole-changer when selected stepping relays are operated to prolong selected impulses of said series, and code responsive means at the other station selectively responsive to the relative lengths of the impulses of said series irrespective of their polarity.
  • a remote control system two stations connected by a normally closed line circuit including a source of current at one station, a pole changer at one station effective when actuated to reverse the polarity of the current delivered to said line circuit, a series of stepping relays,
  • a series of stepping relays at each station means for operating the relays of each series sequentially when impulses of alternately opposite polarity are transmitted over said first line circuit, a code transmitting relay at one station for transmitting impulses of alternately opposite polarity over said first line circuit, a code transmitter at the other station for transmitting impulses of alter nately opposite polarity over said second line circuit, means at said one station for retransmitting over said first line circuit the impulses re ceived over said second line circuit means at each station controlled by the stepping relays at that station for at times operating the associated code transmitter and for governing the relative lengths of the impulses transmitted over the corresponding line circuit to the other station in accordance with a code, code responsive means controlled by each series of stepping relays selectively responsive to the relative lengths of the impulses of the code delivered by the other station, independent means for initiating the operation of said code transmitters, and means at one station for discontinuing
  • a remote control system an office and a plurality of stations, line wires connecting the ofiice and stations to provide a control line channel and an indication line channel, a code transmitter at the oflice effective when initiated to transmit a multiple impulse control code to the stations over the control line channel, a code transmitter at each station effective when initiated to transmit a multiple impulse indication code to the ofiice over the indication line channel, a repeating relay controlled over the indication line channel having contacts in the control line channel for repeating over the control line channel each indication code transmitted over the indication line channel, coderesponsive means at

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Selective Calling Equipment (AREA)
US219978A 1938-07-19 1938-07-19 Remote control system Expired - Lifetime US2206435A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US219978A US2206435A (en) 1938-07-19 1938-07-19 Remote control system
GB16000/39A GB529990A (en) 1938-07-19 1939-05-31 Improvements relating to remote control systems
FR857065D FR857065A (fr) 1938-07-19 1939-06-28 Perfectionnements aux systèmes de commande à distance

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Application Number Priority Date Filing Date Title
US219978A US2206435A (en) 1938-07-19 1938-07-19 Remote control system

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US2206435A true US2206435A (en) 1940-07-02

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US219978A Expired - Lifetime US2206435A (en) 1938-07-19 1938-07-19 Remote control system

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FR (1) FR857065A (fr)
GB (1) GB529990A (fr)

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FR857065A (fr) 1940-08-24
GB529990A (en) 1940-12-03

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