Communications: electrical – Vehicle detectors – Inductive
Patent
1991-12-20
1993-09-21
Crosland, Donnie L.
Communications: electrical
Vehicle detectors
Inductive
340933, 340934, 377 9, 235 99A, G08G 101, G06M 100
Patent
active
052472973
ABSTRACT:
An estimate of the number of vehicles crossing a loop inductor having one or more interconnected discrete loops of the type found in vehicle detector system installations. A measuring signal follows changes in loop inductance caused by the influence of vehicles crossing the loop inductor. A vehicle count threshold value is computed by observing changes in the measuring signal caused by the first car crossing the loop. Subsequent excursions of the measuring signal between relative minima and relative maxima are tested against the threshold and a vehicle count event is registered when the differences exceed the threshold. After a predetermined count period, the number of vehicle counts is estimated from the total count events by multiplying them by an interpolation factor determined empirically from the type of loop inductor. Apparatus for perfoming the method is combined with a conventional vehicle detector system in a switch selectable apparatus for specifying vehicle detector mode or vehicle count mode. The system furhter includes a user selectable circuit for matching the interpolation factor to the type of loop inductor used with the system.
REFERENCES:
patent: 3943339 (1976-03-01), Koerner et al.
patent: 4201908 (1980-05-01), Johnson et al.
patent: 4296401 (1981-10-01), Duley
patent: 4491841 (1985-01-01), Clark
patent: 5028921 (1991-07-01), Potter
Allen Robert S.
Seabury Thomas W.
Crosland Donnie L.
Detector Systems, Inc.
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