Vehicle detector with at least one inductive loop as a sensor, a

Details Vehicle detector with at least one inductive loop as a sensor, a Vehicle detector with at least one inductive loop as a sensor, a

1999-09-15

2000-08-08

Wu, Daniel J.

Communications: electrical

Vehicle detectors

Inductive

340938, 340934, 340935, 340936, G08G 101

Patent

active

061008206

ABSTRACT:
A vehicle detectors with at least one inductive loop is used as a sensor. An oscillator circuit comprises a fixed-frequency oscillator, which is directly connected to one of the inductive loops' two terminals, for purposes of exciting said loop. In addition, a phase/amplitude controller is arranged between the fixed-frequency oscillator and the other terminal, which forms a summation point of the inductive loop to deliver a compensation signal that is derived from the transmit signal in an amplitude-controlled and phase-controlled manner. The inductive loop, the fixed-frequency oscillator and the phase/amplitude controller form a bridge circuit in which (with reference to the resulting voltage at the summation point) the transmit signal and the compensation signal add up to zero in the resting state of the inductive loop. A detection signal for the presence of a vehicle in the detection range of the induction loop is derived from a voltage at this summation point which deviates therefrom.

REFERENCES:
patent: 3373374 (1968-03-01), Marosi
patent: 3685013 (1972-08-01), Brickner
patent: 4639689 (1987-01-01), Bartlett
patent: 4873494 (1989-10-01), Jefferis
patent: 5936551 (1999-08-01), Allen et al.

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