Simulating the presence of a large motor vehicle in an inductive

Details Simulating the presence of a large motor vehicle in an inductive Simulating the presence of a large motor vehicle in an inductive

1997-09-26

2000-06-06

Wu, Daniel J.

Communications: electrical

Traffic control indicator

Portable

340918, 340941, 342 44, G08G 100

Patent

active

060724080

ABSTRACT:
In a first embodiment, a voltage controlled oscillator (VCO) is driven by a generator that provides a cyclic voltage having a sawtooth waveform. The VCO cyclicly provides a signal at a frequency that varies over a range that includes a frequency of a transmitted signal that causes a vehicular traffic signal light control system, of a type that has an inductive loop buried in a roadway, to provide a desired illumination of traffic signal lights of the system. The VCO is connected to a power amplifier that has its output connected to an antenna. In a second embodiment, a signal processor provides a train of pulses at a frequency of radiation from the inductive loop. The number of the pulses of the pulse train that are provided during a timing interval is stored by a counter. A digital to analog converter is connected to the output of the counter. After the timing interval, a signal is transmitted substantially at the frequency of radiation in response to the output of a VCO that is connected to the converter.

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