Vehicle simulation circuit for loop traffic signal control syste

Details Vehicle simulation circuit for loop traffic signal control syste Vehicle simulation circuit for loop traffic signal control syste

1990-05-29

1991-10-15

Crossland, Donnie L.

Communications: electrical

Vehicle detectors

Inductive

340933, 340515, G08G 101

Patent

active

050578316

ABSTRACT:
The present invention provides a simulator which when used aboard a vehicle normally undetectable by a traffic signal control system (e.g. A.C. energized buried sensing loop type which detects predetermined changes in the characteristics of an electromagnetic field due to the presence of a detectable vehicle therewithin), will substantially simulate the characteristics of a detectable vehicle within its field and thereby cause any activation of the system. Operationally, the simulator derives an electrical signal from the field (e.g. via a receiving antenna), converts the electrical signal into a modified transmittable signal of an amplitude which when impressed upon the field (e.g. via a transmitting antenna) simulates electromagnetic influence of a detectable vehicle therewithin which is sensed by the detector circuitry and activates an associated traffic signal controller to provide the necessary signals (e.g. a green arrow) to allow safe and unobstructed traffic flow at an intersection.

REFERENCES:
patent: 3859624 (1975-01-01), Kriofsky et al.
patent: 4321589 (1982-03-01), King
patent: 4529982 (1985-07-01), Karlstrom et al.
patent: 4566008 (1986-01-01), Powers et al.
patent: 4630044 (1986-12-01), Polzer
patent: 4912471 (1990-03-01), Tyburski et al.

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