Vehicle detector system with automatic loop checking

Details Vehicle detector system with automatic loop checking Vehicle detector system with automatic loop checking

2006-09-19

2006-09-19

Goins, Davetta W. (Department: 2632)

Communications: electrical

Vehicle detectors

C340S935000, C340S941000, C324S654000, C324S243000

Reexamination Certificate

active

07109887

ABSTRACT:
A method and apparatus for automatically testing the integrity of an inductive loop in a vehicle detector system. A check loop is placed adjacent each inductive loop in a multi-channel vehicle detector system. Each check loop is periodically activated by the vehicle detector to simulate a vehicle load on the associated inductive loop. Samples representing loop inductance at different activation periods are compared with a standard. When the result exceeds the standard, the inductive loop is subjected to additional sample testing with decreasing time intervals between sampling. After a number of additional samples exceed the standard, the inductive loop is deemed failed.

REFERENCES:
patent: 4201908 (1980-05-01), Johnson et al.
patent: 5621661 (1997-04-01), Farrow
patent: 5777893 (1998-07-01), Farrow et al.

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