Method and arrangement for determining the velocity of a vehicle

Details Method and arrangement for determining the velocity of a vehicle Method and arrangement for determining the velocity of a vehicle

1980-08-04

1983-01-11

Krawczewicz, Stanley T.

Electricity: measuring and testing

Electrical speed measuring

Including 'event' sensing means

340 38L, G01P 366

Patent

active

043684289

ABSTRACT:
A vehicle detection system including a pair of inductive loops arranged in the road surface for measuring the speed of passing vehicles. Each loop is the frequency determining element of an oscillator of first and second vehicle detectors. A first measuring value is derived by each detector for a first predetermined measuring time interval in which the measuring value exceeds a response threshold and a second measuring value is derived for a predetermined second measuring time interval shifted a predetermined period of time relative to the first measuring time interval, the second measuring value being below the response threshold. The instant at which each of the detectors is activated is determined by interpolation between the first and second measuring values.

REFERENCES:
patent: 3364465 (1968-01-01), Prucha
patent: 3373374 (1968-03-01), Marosi
patent: 3656059 (1972-04-01), Overstreet
patent: 4234923 (1980-11-01), Eshraghian et al.

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