US3689788A - Rollability prediction system - Google Patents

Rollability prediction system Download PDF

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Publication number
US3689788A
US3689788A US83365A US3689788DA US3689788A US 3689788 A US3689788 A US 3689788A US 83365 A US83365 A US 83365A US 3689788D A US3689788D A US 3689788DA US 3689788 A US3689788 A US 3689788A
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United States
Prior art keywords
rollability
car
retarder
velocity
track
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Expired - Lifetime
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US83365A
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English (en)
Inventor
Peter J Wong
Dale W Ross
Kenneth W Gardiner
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Southern Pacific Transportation Co
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Southern Pacific Transportation Co
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L17/00—Switching systems for classification yards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61B—RAILWAY SYSTEMS; EQUIPMENT THEREFOR NOT OTHERWISE PROVIDED FOR
    • B61B1/00—General arrangement of stations, platforms, or sidings; Railway networks; Rail vehicle marshalling systems
    • B61B1/005—Rail vehicle marshalling systems; Rail freight terminals

Definitions

  • This invention relates to railway classification yards and more particularly to an improved automatic control system therefor.
  • An object of this invention is the provision of a system for increasing the accuracy of the prediction of the cars rollability on a bowl track.
  • Another-object of this invention is the provision of a novel car retarder control system.
  • Yet another object of this invention is the provision of a novel and useful car control system.
  • FIG. 1 is a schematic drawing of an embodiment of this invention.
  • FIG. 2 is a block schematic drawing of a rollability predicting circuit which may be employed in this invention.
  • FIG. 3 is a block schematic diagram of a bowl rollability predicting circuit.
  • FIG. 4 is a block schematic diagram of an arrangement for controlling the last retarder before the bowl track in accordance with this invention.
  • FIG. 1 there is shown schematically a track section 10in a railway classification yard and along the upper track section there is a master retarder 12, followed by a group retarder 14, followed by .a tangent point'retarder 16, which is positioned just before the bowl track 18.
  • velocity is measured at more than one point along the upper track. This occurs for example by determining the velocity with velocity detectors.
  • a velocity'detector 20 measures the velocity of a car as it comes out of the master retarder 12.
  • a second velocity detector 22 measures the velocity of the car as it enters the group retarder 14. From the difference in velocities measured between these two detectors, one can compute, using the formula (1) a rollability for the car which is designated as R1. This computation is provided by an R1 computer, 24. 1 I
  • the velocity of the car as it leaves the group retarder v is measured by a velocity detector 26.
  • the velocity of the car a distance downstream from the exit from the group retarder is again measured by a fourth velocity detector 28.
  • Thedifference in velocities between the detectors 26 and 28 are entered into an R2 computer, 30, which provides a second rollability quantity designated as R2.
  • the rollability is again measured by using a velocity detector 32 to measure the velocity of the'car as it passes a given point on the track.
  • the velocity of the car just before it enters the tangent point retarder 16 is measured by a velocity detector 34.
  • the difference between these two velocities is entered into an R3 computer to produce a quantity R3.
  • the three (or more if desired) rollabilitymeasurements R1, R2 and R3 are entered into an R Bowl Computer 36.
  • This V Computer produces at its output the velocity required for the car when it leaves the tangent point retarder.
  • a suitable speed detector 42 such as a radar detector, measures control 44. Another input to the retarder control is the.
  • the retarder control compares these velocities and controls the retarder to slow down the car until equality is established at which point-the car may be released with the proper velocity.
  • Equation (1) the term R can be expressed in terms of two velocity measurements and the other quantities as:
  • FIG. Z shows a schematic diagram illustrative of an R1, or R2 or R3 computer. It is an analog computer derived from the equation (2).
  • the outputs of the first two velocity detectors 20, 22 for example are applied to a summer 50, and to a subtractor 52 respectively providing V, V and V V outputs. These are applied to a multiplier 54. Its output, which is V ⁇ V, is applied across a potentiometer 56, the slider of which is set to provide as output,
  • FIG. 3 is a schematic drawing of how equation (3) may be implemented so that the term R can be automatically derived from the quantities.
  • the constants a, through a are respectively derived (in a mariner to be shown later herein) by using the respective potentiometers 64, 66, 68, and 70, which are connected across potential sources respectively 72, 74, 76 and 78.
  • a is multiplied with R by a multiplier circuit 80.
  • a is multiplied with R, by a multiplier circuit 82.
  • a multiplier circuit 84 multiplies a and R
  • the outputs of the three multiplier circuits together with a, are applied to a summing circuit 86.
  • FIG.- 4 shows an analog computer for calculating quantity V, which is the output velocity desiredfrom the tangent point retarder.
  • the product R g is determined by a multiplier having as one input the constant 3, derived from a potentiometer 92 across a v potential source 94. The other input is derived from a potentiometer 96 across which is applied the previously calculated quantity R The setting of the potentiometer provides an output bowl .290
  • the output of the multiplier is applied to a subtractor 98, having as its other input the constant term 0 g.
  • This is derived from a potentiometer 100 connected across a derived by establishing an analog quantity V by means of a potentiometer 108 connected across a potential source 110.
  • the output of the potentiometer is connected to a squaring circuit 112. This provides the quantity V
  • the output of the summing circuit 106 is connected to a square root circuit 114 whose output is the term V,. 'As previously pointed out in connection with FIG. 1, V, is compared with the actual velocity measured for the car as it is passing through the tangent point retarder which is instructed by any quantity to retard the car until V, and the actual measured velocity are the same.
  • circuits shown herein being comprised of mu]- tiplier and subtraction circuits, summers, squaring circuits and square root circuits, are all Well known operational amplifier circuits which are commercially purchasable.
  • Velocity, detectors also known as speed detectors are well known in the art as is the radar speed measuring system.
  • I In a railway classification yard of the type having a hump over which a track extends down to a bowl track section, and there is a master retarder at the hump track section, a tangent point retarder at the commencement of the bowl track section, and at least one group retarder positioned along the track section between the master retarder and the tangent point retarder, the improvement comprising:
  • R is car bowl rollability
  • R R R are the rollability measurement made at each of said several sections of track, a, a a a,, are empirically predetermined rollability coefficients for each track sections along which a rollability measurement is made,
  • said means for determining a required velocity from the derived bowl rollability towards said car comprises a computer means for solving the equation means for measuring the car rollability between the master retarder and the group retarder, the second-and third means for respectively measuring the car rollability along spaced distances between said group retarder and said tangent point retarder.
  • a method of establishing a proper coupling velocity for a car entering said bowl track comprising:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Circuits Of Receivers In General (AREA)
  • Selective Calling Equipment (AREA)
US83365A 1970-10-23 1970-10-23 Rollability prediction system Expired - Lifetime US3689788A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US8336570A 1970-10-23 1970-10-23

Publications (1)

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US3689788A true US3689788A (en) 1972-09-05

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US83365A Expired - Lifetime US3689788A (en) 1970-10-23 1970-10-23 Rollability prediction system

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US (1) US3689788A (OSRAM)
JP (1) JPS5543939B1 (OSRAM)
AT (1) AT319328B (OSRAM)
AU (1) AU463767B2 (OSRAM)
CA (1) CA937314A (OSRAM)
CH (1) CH534603A (OSRAM)
DE (1) DE2150833C2 (OSRAM)
FR (1) FR2110937A5 (OSRAM)
GB (1) GB1335480A (OSRAM)
IT (1) IT942079B (OSRAM)
NO (1) NO136034C (OSRAM)
SE (1) SE376738B (OSRAM)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2137642C1 (ru) * 1998-03-20 1999-09-20 Валеев Георгий Галиуллович Способ изменения скорости вагонов
US20040102878A1 (en) * 2002-11-22 2004-05-27 New York Air Brake Corporation Method and apparatus of monitoring a railroad hump yard
US20080097659A1 (en) * 2006-10-20 2008-04-24 Hawthorne Michael J Method of marshalling cars into a train
US20080154449A1 (en) * 2006-12-20 2008-06-26 John Edward Borntraeger System, Method, and Computer-Readable Media For Monitoring Motion of Railcars In A Railroad Yard
CN111923954A (zh) * 2020-09-22 2020-11-13 北京全路通信信号研究设计院集团有限公司 车组放头量确定方法、装置、系统、计算机可读存储介质

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987003851A1 (fr) * 1985-12-17 1987-07-02 Rostovsky Institut Inzhenerov Zheleznodorozhnogo T Procede et dispositif pour regler la vitesse de vehicules roulant sur rails
DE19507932C1 (de) * 1995-02-24 1996-07-25 Siemens Ag Verfahren zum Bilden eines Ersatzwertes für eine laufbestimmende Eigenschaft von Wagen auf einer Rangieranlage
DE19507931C1 (de) * 1995-02-24 1996-09-12 Siemens Ag Verfahren zum Aktualisieren von Ersatzwerten für eine laufbestimmende Eigenschaft von Wagen auf einer Rangieranlage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3014658A (en) * 1958-03-18 1961-12-26 Westinghouse Air Brake Co Classification yard computer
US3054893A (en) * 1959-04-06 1962-09-18 Gen Railway Signal Co Automatic car retarder control system
GB924205A (en) * 1960-03-11 1963-04-24 Siemens Ag An installation by which is obtained a measurement which represents the acceleration of a railway vehicle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3014658A (en) * 1958-03-18 1961-12-26 Westinghouse Air Brake Co Classification yard computer
US3054893A (en) * 1959-04-06 1962-09-18 Gen Railway Signal Co Automatic car retarder control system
GB924205A (en) * 1960-03-11 1963-04-24 Siemens Ag An installation by which is obtained a measurement which represents the acceleration of a railway vehicle

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2137642C1 (ru) * 1998-03-20 1999-09-20 Валеев Георгий Галиуллович Способ изменения скорости вагонов
US20040102878A1 (en) * 2002-11-22 2004-05-27 New York Air Brake Corporation Method and apparatus of monitoring a railroad hump yard
US20040138789A1 (en) * 2002-11-22 2004-07-15 Hawthorne Michael J. Method and apparatus of monitoring a railroad hump yard
US6789005B2 (en) * 2002-11-22 2004-09-07 New York Air Brake Corporation Method and apparatus of monitoring a railroad hump yard
US6856865B2 (en) 2002-11-22 2005-02-15 New York Air Brake Corporation Method and apparatus of monitoring a railroad hump yard
US20080097659A1 (en) * 2006-10-20 2008-04-24 Hawthorne Michael J Method of marshalling cars into a train
US7657349B2 (en) 2006-10-20 2010-02-02 New York Air Brake Corporation Method of marshalling cars into a train
US20080154449A1 (en) * 2006-12-20 2008-06-26 John Edward Borntraeger System, Method, and Computer-Readable Media For Monitoring Motion of Railcars In A Railroad Yard
CN111923954A (zh) * 2020-09-22 2020-11-13 北京全路通信信号研究设计院集团有限公司 车组放头量确定方法、装置、系统、计算机可读存储介质

Also Published As

Publication number Publication date
AT319328B (de) 1974-12-10
NO136034C (no) 1977-07-20
AU3162971A (en) 1973-02-01
FR2110937A5 (OSRAM) 1972-06-02
DE2150833A1 (de) 1972-04-27
DE2150833C2 (de) 1981-12-10
IT942079B (it) 1973-03-20
SE376738B (OSRAM) 1975-06-09
JPS5543939B1 (OSRAM) 1980-11-10
CH534603A (de) 1973-03-15
GB1335480A (en) 1973-10-31
AU463767B2 (en) 1975-08-07
NO136034B (OSRAM) 1977-04-04
CA937314A (en) 1973-11-20

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