System for determining vehicle speed and presence

Details System for determining vehicle speed and presence System for determining vehicle speed and presence

1992-11-06

1995-10-03

Teska, Kevin J.

Boots, shoes, and leggings

364438, 324238, 340936, 340941, G06F 1516, G08G 102

Patent

active

054557682

ABSTRACT:
A system for monitoring ferromagnetic materials in proximity to a sensing region, which is particularly applicable to traffic monitoring and controlling. A magnetic probe generates a signal in response to magnetic flux changes caused by a vehicle moving through a sensing area. A processor analyzes the signal to determine the duration of the signal and correlates that duration to a vehicle velocity. A checking system periodically sends a checking signal to the magnetic probe and monitors the return signal to verify that the probe is operative and also analyzes the return signal to determine whether a stationary vehicles is in the sensing area.

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Xue et al., "S Low Cost Stator Flux Oriented Voltage Source Variable Speed Drive", IEEE 1990, pp. 410-415.

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