Vehicle detector with environmental adaptation

Details Vehicle detector with environmental adaptation Vehicle detector with environmental adaptation

1993-07-29

1996-04-16

Peng, John K.

Communications: electrical

Vehicle detectors

Speed and overspeed

340933, 340941, 364438, 324236, G08G 101

Patent

active

055086985

ABSTRACT:
A reference value used in a vehicle detector is checked and adjusted. The vehicle detector determines the speed of a vehicle which it has detected and then makes a sample measurement after the vehicle has left the detection area of its inductive sensor. The timing of the measurement is based on the speed of the vehicle. The sample measurement is compared to the reference value, and adjustment of the reference value is made accordingly. In order to identify the cause of changes in the sensor drive oscillator signal frequency, the frequency of the oscillator signal is measured while connected to a dummy sensor not affected by vehicles. The reference value also is adjusted to reflect slow changes (drift) in sensor drive oscillator frequency. To identify changes in sensor drive oscillator frequency caused by mechanical difficulties which require maintenance activity to correct, a rate of frequency change of the sensor drive oscillator signal is determined over the plurality of measurement scanning segments.

REFERENCES:
patent: 3609679 (1971-09-01), Updegraff et al.
patent: 3685013 (1972-08-01), Brickner
patent: 3943339 (1976-03-01), Koerner et al.
patent: 3989932 (1976-11-01), Koerner
patent: 4368428 (1983-01-01), Dijkman
patent: 4369427 (1983-01-01), Drebinger et al.
patent: 4379280 (1983-04-01), Eshraghian et al.
patent: 4449115 (1984-05-01), Koerner
patent: 4459561 (1984-07-01), Clark et al.
patent: 4472706 (1984-09-01), Hodge et al.
patent: 4491841 (1985-01-01), Clark
patent: 4668951 (1987-05-01), Duley et al.
patent: 4862162 (1989-08-01), Duley
patent: 4873494 (1989-10-01), Jefferis
patent: 4949054 (1990-08-01), Briefer
patent: 5278555 (1994-01-01), Hookman

Affiliated with

Also associated with

Rating

Vehicle detector with environmental adaptation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Vehicle detector with environmental adaptation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vehicle detector with environmental adaptation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-328294