EP0301812A3 - Improved vehicle detector method and system - Google Patents

Improved vehicle detector method and system Download PDF

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Publication number
EP0301812A3
EP0301812A3 EP88306887A EP88306887A EP0301812A3 EP 0301812 A3 EP0301812 A3 EP 0301812A3 EP 88306887 A EP88306887 A EP 88306887A EP 88306887 A EP88306887 A EP 88306887A EP 0301812 A3 EP0301812 A3 EP 0301812A3
Authority
EP
European Patent Office
Prior art keywords
vehicle detector
improved vehicle
detector method
loop
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.)
Withdrawn
Application number
EP88306887A
Other languages
German (de)
French (fr)
Other versions
EP0301812A2 (en
Inventor
Thomas Ray Potter
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.)
Detector Systems Inc
Original Assignee
Detector Systems 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 Detector Systems Inc filed Critical Detector Systems Inc
Publication of EP0301812A2 publication Critical patent/EP0301812A2/en
Publication of EP0301812A3 publication Critical patent/EP0301812A3/en
Withdrawn legal-status Critical Current

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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

Abstract

In an inductive loop vehicle detector, a sample count which depends on the loop inductance is compared with a reference count in producing a detection signal. In order to take account of loop drift, the reference count is replaced with the sample count when the difference therebetween indicates drift for a predetermined period of time.
EP88306887A 1987-07-27 1988-07-26 Improved vehicle detector method and system Withdrawn EP0301812A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7793387A 1987-07-27 1987-07-27
US77933 1987-07-27

Publications (2)

Publication Number Publication Date
EP0301812A2 EP0301812A2 (en) 1989-02-01
EP0301812A3 true EP0301812A3 (en) 1989-07-12

Family

ID=22140876

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88306887A Withdrawn EP0301812A3 (en) 1987-07-27 1988-07-26 Improved vehicle detector method and system

Country Status (2)

Country Link
EP (1) EP0301812A3 (en)
JP (1) JP2668402B2 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3868626A (en) * 1973-07-09 1975-02-25 Gulf & Western Industries Digital loop detector system
US3943339A (en) * 1974-04-29 1976-03-09 Canoga Controls Corporation Inductive loop detector system
GB2131994A (en) * 1982-12-02 1984-06-27 Sarasota Automation Inductive loop sensors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3868626A (en) * 1973-07-09 1975-02-25 Gulf & Western Industries Digital loop detector system
US3943339A (en) * 1974-04-29 1976-03-09 Canoga Controls Corporation Inductive loop detector system
GB2131994A (en) * 1982-12-02 1984-06-27 Sarasota Automation Inductive loop sensors

Also Published As

Publication number Publication date
EP0301812A2 (en) 1989-02-01
JPH01120699A (en) 1989-05-12
JP2668402B2 (en) 1997-10-27

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