Vehicle detector measurement frame segmentation

Details Vehicle detector measurement frame segmentation Vehicle detector measurement frame segmentation

G - Physics

08

G

G08G 1/042 (2006.01)

Patent

CA 2069231

VEHICLE DETECTOR MEASUREMENT APPARATUS AND METHOD USING FRAME SEGMENTATION ABSTRACT OF THE DISCLOSURE A vehicle detector includes one or more inductive sensors connected to an oscillator circuit. A timing circuit defines a plurality of sequential measurement frame segments. The oscillator circuit is coupled to an inductive sensor during each of the measurement frame segments. The time duration of each of the plurality of measurement frame segments is measured. After the completion of each frame segment for a particular inductive sensor, a total measurement frame time duration for that sensor is calculated based upon durations of a predetermined number of measurement frame segments for that sensor. The total measurement frame time duration and a reference time duration are compared and a difference is determined. If the difference between the total measurement frame time duration and the reference time duration exceeds a threshold value, an output signal indicative of the presence of a vehicle in the vicinity of the inductive sensor is generated.

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