GB1301920A - - Google Patents

Info

Publication number
GB1301920A
GB1301920A GB5775470A GB5775470A GB1301920A GB 1301920 A GB1301920 A GB 1301920A GB 5775470 A GB5775470 A GB 5775470A GB 5775470 A GB5775470 A GB 5775470A GB 1301920 A GB1301920 A GB 1301920A
Authority
GB
United Kingdom
Prior art keywords
signal
crossing
receiver
amplitude
quasi
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
GB5775470A
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 filed Critical
Publication of GB1301920A publication Critical patent/GB1301920A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L29/00—Safety means for rail/road crossing traffic
    • B61L29/24—Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning
    • B61L29/28—Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning electrically operated
    • B61L29/286—Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning electrically operated using conductor circuits controlled by the vehicle

Abstract

1301920 Level crossing control system GENERAL SIGNAL CORP 4 Dec 1970 [4 Dec 1969] 57754/70 Heading B7N In a level crossing control system an A.C. signal transmitter 20 is coupled to the track adjacent the crossing with a receiver 21 ressponsive to the rate of change of amplitude of the signal and the signal amplitude is arranged to vary as a quasi-logarithmic function of the distance of a vehicle axle 11 from the crossing so that the receiver produces a crossing signal at a fixed time before vehicle arrival by supplying an output when the rate of change of the signal amplitude is above a set value. The quasi-logarithmic relationship between the signal amplitude E and the distance S is obtained by arranging the track impedance Za, the input and output impedances Zin, Zs of the receiver and transmitter respectively and the frequency of the A.C. signal such that over the range of distances required the product of S and dE/dS is approximately constant. Slope detector 31 produces a signal when the slope exceeds a set value and operates the warning 51 via output generator 41.
GB5775470A 1969-12-04 1970-12-04 Expired GB1301920A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US88218369A 1969-12-04 1969-12-04

Publications (1)

Publication Number Publication Date
GB1301920A true GB1301920A (en) 1973-01-04

Family

ID=25380066

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5775470A Expired GB1301920A (en) 1969-12-04 1970-12-04

Country Status (4)

Country Link
US (1) US3610920A (en)
CA (1) CA934468A (en)
GB (1) GB1301920A (en)
ZA (1) ZA708196B (en)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777139A (en) * 1970-12-03 1973-12-04 R Peel Motion sensor system
US3929307A (en) * 1973-04-09 1975-12-30 Erico Rail Prod Co Railway signal system with speed determined movement detector
DE2623967C3 (en) * 1976-05-28 1979-09-20 Standard Elektrik Lorenz Ag, 7000 Stuttgart Phase-synchronously controlled track circuit receiver
US4172576A (en) * 1977-06-21 1979-10-30 General Signal Corporation Highway crossing system with motion detecting apparatus
US4283031A (en) * 1977-12-14 1981-08-11 Finch Colin M System controlling apparatus which compares signals from sensors monitoring passing objects with pre-determined parameter information to control the system
US4306694A (en) * 1980-06-24 1981-12-22 American Standard Inc. Dual signal frequency motion monitor and broken rail detector
US4324376A (en) * 1980-06-24 1982-04-13 American Standard Inc. Railroad highway crossing warning system
FR2490569A1 (en) * 1980-09-22 1982-03-26 Signaux Entr Electriques PERFECTION RAILWAY TRACK CIRCUIT
US5098044A (en) * 1989-12-22 1992-03-24 General Railway Signal Corporation Highway crossing control system for railroads utilizing a communications link between the train locomotive and the crossing protection equipment
US5092544A (en) * 1989-12-22 1992-03-03 General Railway Signal Corp. Highway crossing control system for railroads utilizing a communications link between the train locomotive and the crossing protection equipment
US5417388A (en) * 1993-07-15 1995-05-23 Stillwell; William R. Train detection circuit
US6876309B1 (en) 1994-11-21 2005-04-05 Espeed, Inc. Bond trading system
US8588729B2 (en) * 1994-11-21 2013-11-19 Bgc Partners, Inc. Method for retrieving data stored in a database
WO2002064414A2 (en) 2001-01-23 2002-08-22 Alstom Signaling, Inc. Method and apparatus for uniform time warning of railroad trains
US8590844B2 (en) 2009-07-17 2013-11-26 Siemens Rail Auotmation Corporation Track circuit communications
US8500071B2 (en) * 2009-10-27 2013-08-06 Invensys Rail Corporation Method and apparatus for bi-directional downstream adjacent crossing signaling
US8660215B2 (en) * 2010-03-16 2014-02-25 Siemens Rail Automation Corporation Decoding algorithm for frequency shift key communications
US8297558B2 (en) * 2010-03-17 2012-10-30 Safetran Systems Corporation Crossing predictor with authorized track speed input
US9150227B1 (en) * 2014-04-07 2015-10-06 Electro-Motive Diesel, Inc. Receive attenuation system for a locomotive consist

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3035167A (en) * 1958-12-03 1962-05-15 Westinghouse Air Brake Co Railway track circuit
GB1000793A (en) * 1961-07-14 1965-08-11 Westinghouse Brake & Signal Improvements relating to railway track circuits
US3246143A (en) * 1963-09-30 1966-04-12 Southern Pacific Company Railroad grade crossing protection system
US3450874A (en) * 1967-03-31 1969-06-17 Gen Electric Railway track circuit

Also Published As

Publication number Publication date
CA934468A (en) 1973-09-25
ZA708196B (en) 1971-09-29
US3610920A (en) 1971-10-05

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee