Inductive loop vehicle detector

Details Inductive loop vehicle detector Inductive loop vehicle detector

1983-08-10

1987-05-26

Rowland, James L.

Communications: electrical

Vehicle detectors

Inductive

34082515, 34082505, 340115, 331 64, 331 65, G08G 101

Patent

active

046689516

ABSTRACT:
In a vehicle detection apparatus having a plurality of channels, each arranged for detecting vehicles according to their influence upon the frequency of a respective loop oscillator the oscillation frequency of which is dependent on the inductance of a respective vehicle-sensing inductive loop, a common computer performs a calculation for each channel in turn whereby changes in the frequency of the respective loop oscillator are monitored and analysed. In one embodiment, the computer calculates an appropriate operational number, the time taken for that particular number of loop cycles to occur is measured and stored as a period count and the period count is compared with an environmental reference number to determine whether or not a vehicle detected flag should be raised or lowered. Neither the operational number calculated by the computer nor the reference number is fixed but provision is made for updating both. In another embodiment, the computer calculates an appropriate period of time and the number of loop cycles occurring in that time is counted and that count stored for use in determining whether the vehicle detected flag should be raised or lowered. Again, provision is made for updating the calculated period of time and the reference number.

REFERENCES:
patent: 3868626 (1975-02-01), Masher
patent: 3943339 (1976-03-01), Koerner et al.
patent: 3989932 (1976-11-01), Koerner
patent: 4296401 (1981-10-01), Duley
patent: 4491841 (1985-01-01), Clark

Affiliated with

Also associated with

Rating

Inductive loop vehicle detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-706616