Communications: electrical – Vehicle detectors
Patent
1997-01-10
1998-05-05
Hofsass, Jeffery
Communications: electrical
Vehicle detectors
340935, 340941, 200 86A, 324253, 364436, G08G 101
Patent
active
057481083
ABSTRACT:
A detector for detecting a characteristic and a speed of a vehicle includes a first magnetic field sensor for generating a first analog signal indicative of changes in magnetic field strength adjacent the first sensor in response to the vehicle passing. A differentiating circuit differentiates the first analog signal and produces a first output that changes binary state in response to detecting a predetermined change in the differentiated first analog signal. A counter accumulates values at a predetermined rate and a microprocessor stores values of the counter corresponding to each change in the binary state of the first output of the differentiating circuit. The microprocessor converts the stored counter values into a first time series profile corresponding to changes in the first output of the differentiating circuit and accumulates and stores a count of a characteristic of the passing vehicle based on the first time series profile. A second time series profile is produced from counter values accumulated in response to the differentiating circuit producing a second output. The second output of the differentiating circuit changes binary state in response to detecting a second analog signal output from a second magnetic field sensor spaced apart from the first magnetic field sensor. The microprocessor detects spaced equivalent positions between the first time series profile and the second time series profile and calculates a speed of the vehicle from the elapsed time between the equivalent positions. The microprocessor accumulates and stores a count of the calculated speed.
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Geary Jeffrey A.
Sampey Harry R.
Schimpf James H.
Hofsass Jeffery
Nu-Metrics, Inc.
Tong Nina
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