US3699521A - Decoding system having plural frequency channels - Google Patents

Decoding system having plural frequency channels Download PDF

Info

Publication number
US3699521A
US3699521A US61209A US3699521DA US3699521A US 3699521 A US3699521 A US 3699521A US 61209 A US61209 A US 61209A US 3699521D A US3699521D A US 3699521DA US 3699521 A US3699521 A US 3699521A
Authority
US
United States
Prior art keywords
relay
switching circuits
input signals
relays
contacts
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
US61209A
Other languages
English (en)
Inventor
J Donald Hughson
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.)
SPX Technologies Inc
Original Assignee
General Signal Corp
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 General Signal Corp filed Critical General Signal Corp
Application granted granted Critical
Publication of US3699521A publication Critical patent/US3699521A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2200/00—Type of vehicles
    • B60L2200/26—Rail vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

Definitions

  • NOJ 61,209 A vehicle control decoding system having a plurality of filters tuned to detect code rates for selectively actuating output relays.
  • the decoding [52] 1.1.8. C1. ..340/171 A, 340/171 R system includes first checking means controlled by the F112;; ..A04q1/45 outputs of the filters for delivering an output in 1 "340/171 A cordance with only the most restrictive code rate out- [56] R f Ct d put of the filters and a second checking means e erences governed by the output of the first checking means UNITED STATES PATENTS and contacts of the relays for manifesting that only 2 MI 551 12/1938 PH 340/171 A one of the relays is energized at a time.
  • non-safety type relays having characteristics such that a failure would not result in an unsafe condition.
  • a decoding system having a plurality of filters tuned to detect code ratesfor selectively activating output'relays.
  • the system comprises a first checking means controlled by outputs of the filters for delivering an output in accordance with only the most restrictive code rate output of the filters in case filters for a plurality of code rates should deliver outputs contemporaneously and a second checking means governed by the input of the first checking means and contacts of the relays for manifesting that only one of the relays is energized at a time.
  • each LC combination shown in the drawing' is different from the other for purposes of discriminating one code rate from the other.
  • An amplifier A is serially connected to the output of the filter and increases the output of the filter LC for driving its as sociated relay.
  • the relays L, M and H are output relays for manifesting which of the respective low, medium and high code rate signals have been received and discriminated. This manifestation is represented by the energization of associated contacts 13, 14 or 15, each coupled to a speed control apparatus (not shown), which in turn governs the operation of the vehicle. This is essentially what occurs when safety relays are used to govern the operation of the input contacts to the speed control apparatus. In the present system, however, the relays'L, M and H controlling the inputs to the speed control 13, 14 and 15 respectively are not safety relays and a failure of any one of the relays would result in an unsafe condition.
  • a first checking circuit has been incorporated into the system in order to assure that only the most restrictive code rate output of the filters LC associated with its respective relay L, M or H may be delivered to an output.
  • the output is used to drive all rate relay AR.
  • the LC combination associated with the relay M passes the signal and produces at-itsoutput, energy for activating the associated relay M through driver A.
  • a lead from the input of the driver A is connected to a front contact 17 of the relay M.
  • the energization of relay M as a result of the medium rate code signal passed by the associated LC combination and the signal present at the front contact of contact 17 is coupled through the lead to a back contact 16 of the relay L.
  • the signal is then coupled through the driver A as sociated with all rate relay AR, which when energized by the signal, picks up contacts 19 and 20.
  • relay AR becomes deenergized because there is no low rate signal present at the output of the LC combination .associated with the relay L.
  • relay H becomes energized during the same time when the relay M is energized, there is no effect on the all rate relay AR because the open back contact 17 of relay M is irresponsive to the condition of relay H.
  • This first checking circuit including the contacts 16, 17 and 18 of relays L, M and H provide one phase of the security necessary for rendering the system failsafe.
  • a second checking circuit includes the contacts 21 associated with relay L, 22 and 23 for relay M, 24 and 25 for relay H and 19 and 20 as previously described for relay AR.
  • Relay H might be in the energized position for a number of reasons, for example, a frozen or welded contact or possibly a malfunction in" the associated driver A which in turn could provide energy for holding the relay AR.
  • the second checking circuit therefore, has for one of its purposes to detect when one or more of the relays L, M or H is energized at any one time. It can be seen that a path of energy for holding the check relay CR must be maintained at all times. This is required in order to maintain the contact 26 in a forward or closed position for maintaining the vehicle brake control (not shown) in a-standby condition. If the relay CR drops its contact 26, the brakes of the vehicle are automatically actuated.
  • the resistor-capacitor combination RC across relay CR provides a slow release characteristic to the relay CR for permitting switching time of the other relay contacts of the system.
  • the drawing shows the vehicle in a stop position receiving no code rates from the wayside-Therefore, the relays L, M and H are deenergized and their associated contacts 21; 22, 23; and 24, 25 are all in the back contact positions. Energy is therefore supplied through the back contacts 21, 23, 25 and back contact 20 of relay AR to maintain relay CR energized. If a medium speed code signal is received through the rails R and coupled through the coils 11 and amplifier and filter 12 to the'inputs of the filters LC, then the filter LC and driver A associated with relay M would provide a signal for energizing the relay and coupling a signal through from contact 17 and back contact 16 to energize relay AR.
  • the contacts 22 and 23 associated with the relay M are switched to the front position and the contacts 19 and 20 for relay AR are likewise switched.
  • a path of energy is still maintained, however, for holding the relay CR energized. This path of energy is from energy plus back contact 21, front contact 23, back contact 24 and front contact 19 to the relay CR.
  • the relay M should be deenergized and relay L should pick up its contact 16.
  • the low rate signal coupled through front contact 16 of relay L will hold the relay AR energized because the most restrictive signal is present and is therefore transmitted for holding up the relay AR.
  • the second checking circuit opens the energy path to relay CR namely closed front contact 21 and open contact 22.
  • relays M and H were also simultaneously energized or H and L, in addition, if the relays H and L were simultaneously energized and a high rate were being received, the closed front contact 16 of relay L would prevent energy from the high rate filter LC from being transmitted through relay is energized and closes front contact 17 providing an energy path through back contact 16 for energizing relay AR and its associated contacts 19 and 20.
  • the contacts 22 and 23 of relay M shift to the front position providing an energy path for the relay CR through back contact 21, front contact 23, back contact 24 and front contact 19 to CR.
  • the path of energy to the relay CR is opened because the previously closed backcontact 24 shifts to the forward position and opens circuit to relay CR.
  • the relay L becomes energized simultaneously with the energization of relay M, the relay AR would drop out because of the opened back contact 16. This alone would be sufficient to drop the relay CR.
  • the back contact 21 opens also providing a second open circuit to the relay CR.
  • the system of the present invention therefore provides for checking of the received code rate such that only the most restrictive code rate signal received is capable of energizing the all rate relay AR and the energization of which is used in a second checking circuit which provides for a check that the only one of the code rate relays L, M or H is energized at any one time.
  • a vehicle control decoding system for selectively actuating output switching circuits in accordance with a plurality of coded input signals, comprising:
  • a first, second and third switching circuit responsive to said first, second and third input signal, respectively, for switching circuit signals in accordance with the status of said first, second and third input signals;
  • first checking means controlled by said first, second and third switching circuits for delivering an output in accordance with only a one of said first, second and third switching circuits that has been actuated and selected to correspond to one of said first, second and third input signals present that is related to the most restrictive vehicle operation;
  • second checking means controlled by said first, second and third switching circuits for delivering an output signal when at least two of said first, second and third switching circuits are actuated at the same time;
  • interlock means connecting said first and second checking means so that said second checking means is activated by an output 'signalfrom said first checking means indicating that at least one of said first, second and third switching circuits has been actuated.
  • said first, second and third switching circuits each include a relay actuated by said first, second and third input signals
  • said first checking means includes a pair of frontposition and back-position relay contacts from the relays, in each of said first, second and third switching circuits, the front-position contacts of each pair of relay contacts coupled to corresponding input signals and the back-position contacts coupled to relay contacts in switching circuits related to successively less restrictive input signals than the input signals connected to the respective front-position contacts to provide the selected output signal from said first checking means to activate said interlock means.
  • interlock means includes an interlock relay coupled to the relays of said first, second and third switching circuits for actuating said interlock relay when any one of the relays in said first, second and third switching circuits are actuated by a corresponding one of said first, second and third input signals.
  • said first, second and third switching circuits each include a relay actuated by said first, second and third input signalsv and contacts of each relay are interconnected so that only a single output signal is produced corresponding to the actuated one of said first, second and third switching circuits that is related to the most restrictive one of said first, second and third input signals present.
  • the vehicle control decoding system of claim 1 including a plurality of filters tuned to detect code rates for associated ranges of vehicle speed and said first, second and third input signals are produced by said filters.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
US61209A 1970-08-05 1970-08-05 Decoding system having plural frequency channels Expired - Lifetime US3699521A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US6120970A 1970-08-05 1970-08-05

Publications (1)

Publication Number Publication Date
US3699521A true US3699521A (en) 1972-10-17

Family

ID=22034336

Family Applications (1)

Application Number Title Priority Date Filing Date
US61209A Expired - Lifetime US3699521A (en) 1970-08-05 1970-08-05 Decoding system having plural frequency channels

Country Status (8)

Country Link
US (1) US3699521A (enrdf_load_stackoverflow)
JP (1) JPS5332124B1 (enrdf_load_stackoverflow)
BR (1) BR7105050D0 (enrdf_load_stackoverflow)
CA (1) CA941056A (enrdf_load_stackoverflow)
DE (1) DE2139294A1 (enrdf_load_stackoverflow)
FR (1) FR2104031A5 (enrdf_load_stackoverflow)
GB (1) GB1334259A (enrdf_load_stackoverflow)
NL (1) NL7110829A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913874A (en) * 1974-03-08 1975-10-21 Westinghouse Electric Corp Vehicle control system including residue breakdown voltage across the vehicle rails

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5762516U (enrdf_load_stackoverflow) * 1980-09-30 1982-04-14

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2141551A (en) * 1936-08-01 1938-12-27 Gen Railway Signal Co Centralized traffic controlling system for railroads
US2784393A (en) * 1954-02-26 1957-03-05 Bendix Aviat Corp Frequency multiplex telemetering system
US3302113A (en) * 1962-10-25 1967-01-31 Gen Electric Co Ltd Remote monitoring and control system with all control and monitoring tones generatedat control station
US3396370A (en) * 1964-09-11 1968-08-06 Femco Inc Coded tone supervisory system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2141551A (en) * 1936-08-01 1938-12-27 Gen Railway Signal Co Centralized traffic controlling system for railroads
US2784393A (en) * 1954-02-26 1957-03-05 Bendix Aviat Corp Frequency multiplex telemetering system
US3302113A (en) * 1962-10-25 1967-01-31 Gen Electric Co Ltd Remote monitoring and control system with all control and monitoring tones generatedat control station
US3396370A (en) * 1964-09-11 1968-08-06 Femco Inc Coded tone supervisory system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913874A (en) * 1974-03-08 1975-10-21 Westinghouse Electric Corp Vehicle control system including residue breakdown voltage across the vehicle rails

Also Published As

Publication number Publication date
GB1334259A (en) 1973-10-17
DE2139294A1 (de) 1972-02-10
BR7105050D0 (pt) 1973-06-14
CA941056A (en) 1974-01-29
FR2104031A5 (enrdf_load_stackoverflow) 1972-04-14
NL7110829A (enrdf_load_stackoverflow) 1972-02-08
JPS5332124B1 (enrdf_load_stackoverflow) 1978-09-06

Similar Documents

Publication Publication Date Title
US5459663A (en) Cab signal apparatus and method
US3699521A (en) Decoding system having plural frequency channels
US3307031A (en) Automatic switching system
US3725699A (en) Train detection system for railroad grade crossing
US3626373A (en) Rate code decoding system having high- and low-pass filters
US5041745A (en) Failsafe bandpass filter/decoder
US4314237A (en) Fail-safe acknowledging circuit
US3887152A (en) Automatic vehicle protection system
JP3301517B2 (ja) 地上装置
US2098041A (en) Continuous inductive coded cab signaling system
DE2902238A1 (de) Einrichtung zur zugschlussueberwachung
US3752426A (en) Train detector
US3500388A (en) Fail-safe logic speed command decoder
US2049399A (en) Signaling system for railroads
US2826685A (en) Coded track circuit railway signaling system
US3272979A (en) Decoding apparatus for continuous inductive transmission system
US2590924A (en) Subdivided coded railway track circuit
US2125243A (en) Automatic block signaling system for railroads
US2405860A (en) Railway traffic controlling apparatus
US1712981A (en) Railway-train-control system
US2313468A (en) Railway signaling system
EP1644235A1 (de) Änderung des betriebsmodus an einem schienenfahrzeug
SU818936A1 (ru) Устройство автоматической локомо-ТиВНОй СигНАлизАции
US1824185A (en) Railway traffic controlling system
SU1350073A1 (ru) Устройство дл передачи кодовых сигналов по рельсовой линии