GB1398937A - Vehicle detector systems - Google Patents

Vehicle detector systems

Info

Publication number
GB1398937A
GB1398937A GB2131073A GB2131073A GB1398937A GB 1398937 A GB1398937 A GB 1398937A GB 2131073 A GB2131073 A GB 2131073A GB 2131073 A GB2131073 A GB 2131073A GB 1398937 A GB1398937 A GB 1398937A
Authority
GB
United Kingdom
Prior art keywords
counts
vehicle
loop
store
count
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
GB2131073A
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.)
GEC Elliott Traffic Automation Ltd
Original Assignee
GEC Elliott Traffic Automation Ltd
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 GEC Elliott Traffic Automation Ltd filed Critical GEC Elliott Traffic Automation Ltd
Priority to GB2131073A priority Critical patent/GB1398937A/en
Publication of GB1398937A publication Critical patent/GB1398937A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Traffic Control Systems (AREA)

Abstract

1398937 Vehicle detector GEC - ELLIOTT TRAFFIC AUTOMATION Ltd 6 May 1974 [4 May 1973] 21310/73 HeadingGlN [Also in Division G4] In a vehicle detector system utilizing the fall in inductance as the vehicle passes over a loop L, pulse generating means produces a number of pulses in a marked period dependent on loop inductance and means for determining that number at intervals and affording a representation of vehicle presence in dependence on a comparison of that number at different times. In the embodiment loop L is longer than a normal motor, and may extend over every lane is no discrimination between lanes is required. Oscillator 3 generates a sinusoidal signal of frequency dependent on loop inductance and a selector 5 counts the oscillation cycles to produce a marked period (say 100 oscillation periods) followed by an interval (say 50 oscillation periods). A counter 8 counts pulses from a clock 6 in the marked period and is reset before each count, the count being lower when a vehicle is present. Low counts are stored in store 1 and high counts in store 2, and a store 9 controls traffic signals. A logic chart for determining current count transfer is described, Fig. 2 (not shown). The system takes account of enviromental changes.
GB2131073A 1973-05-04 1973-05-04 Vehicle detector systems Expired GB1398937A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2131073A GB1398937A (en) 1973-05-04 1973-05-04 Vehicle detector systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2131073A GB1398937A (en) 1973-05-04 1973-05-04 Vehicle detector systems

Publications (1)

Publication Number Publication Date
GB1398937A true GB1398937A (en) 1975-06-25

Family

ID=10160719

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2131073A Expired GB1398937A (en) 1973-05-04 1973-05-04 Vehicle detector systems

Country Status (1)

Country Link
GB (1) GB1398937A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075563A (en) * 1976-05-13 1978-02-21 Gulf & Western Industries, Inc. Digital loop detector with improved detection control
EP0023600A1 (en) * 1979-07-20 1981-02-11 Siemens Aktiengesellschaft Method and circuit arrangement for detecting the entry and/or the departure of a vehicle, especially a road vehicle, into or from a specified surveillance area
FR2463412A1 (en) * 1979-08-09 1981-02-20 Philips Nv METHOD AND DEVICE FOR DETERMINING THE SPEED OF A VEHICLE
US4491841A (en) * 1981-04-03 1985-01-01 Sarasota Automation Limited Self-adjusting inductive object-presence detector
US5523753A (en) * 1994-09-12 1996-06-04 Minnesota Mining And Manufacturing Company Vehicle detector system with periodic source filtering
US5734338A (en) * 1991-07-12 1998-03-31 Minnesota Mining And Manufacturing Company Vehicle detector with automatic sensitivity adjustment
US5751225A (en) * 1994-09-12 1998-05-12 Minnesota Mining And Manufacturing Company Vehicle detector system with presence mode counting
GB2408372A (en) * 2003-11-20 2005-05-25 Golden River Traffic Ltd Apparatus and method for determining the presence of a vehicle on a highway

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075563A (en) * 1976-05-13 1978-02-21 Gulf & Western Industries, Inc. Digital loop detector with improved detection control
EP0023600A1 (en) * 1979-07-20 1981-02-11 Siemens Aktiengesellschaft Method and circuit arrangement for detecting the entry and/or the departure of a vehicle, especially a road vehicle, into or from a specified surveillance area
FR2463412A1 (en) * 1979-08-09 1981-02-20 Philips Nv METHOD AND DEVICE FOR DETERMINING THE SPEED OF A VEHICLE
US4491841A (en) * 1981-04-03 1985-01-01 Sarasota Automation Limited Self-adjusting inductive object-presence detector
US5734338A (en) * 1991-07-12 1998-03-31 Minnesota Mining And Manufacturing Company Vehicle detector with automatic sensitivity adjustment
US5523753A (en) * 1994-09-12 1996-06-04 Minnesota Mining And Manufacturing Company Vehicle detector system with periodic source filtering
US5751225A (en) * 1994-09-12 1998-05-12 Minnesota Mining And Manufacturing Company Vehicle detector system with presence mode counting
GB2408372A (en) * 2003-11-20 2005-05-25 Golden River Traffic Ltd Apparatus and method for determining the presence of a vehicle on a highway

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee