Method and device for determining the speed of vehicles via deri

Details Method and device for determining the speed of vehicles via deri Method and device for determining the speed of vehicles via deri

1995-08-03

1997-04-15

O'Shea, Sandra L.

Electricity: measuring and testing

Electrical speed measuring

Including 'event' sensing means

340941, G01F 366, G08G 101

Patent

active

056213140

ABSTRACT:
The invention relates to a method and a device for determining the speed s/.delta.t) of vehicles, in which with the aid of at least two sensors (1, 2, 27, 28) spaced apart from one another (distance s), the time .delta.t=t.sub.1 -t.sub.2 required to drive over both sensors (1, 2, 27, 28) is ascertained. The object of the invention is to disclose a speed measuring method that is simple to accomplish, with which accurate measurement values are ascertainable, and in which external factors of the pavement can largely be ignored. This is attained essentially by using induction loops, instead of the usual piezoresistive pressure sensors, as the measurement sensors (1, 2, 27, 28). Then, however--unlike known induction loop arrays--what is measured when a vehicle drives over (damps) the loops (1, 2, 27, 28) is not the frequency displacement of a resonant circuit comprising a loop resistor and capacitor, but rather the course over time of the respective loop impedance for a predetermined frequency (tripping curve) (22, 23); and the corresponding time reference value t.sub.1, t.sub.2 is then ascertained from that course.

REFERENCES:
patent: 3493954 (1970-02-01), Bartlett et al.
patent: 3685013 (1972-08-01), Brickner
patent: 4368428 (1983-01-01), Bijkman
patent: 5408179 (1995-04-01), Sampey et al.
European Search Report dated 24 Nov. 1995.
Regelungstechnik vol. 1978, No. 9, pp. 291-299.
Patent Abstracts of Japan, P-5, JP 55-13 863, Apr. 4, 1980, vol. 4/No. 43.

Affiliated with

Also associated with

Rating

Method and device for determining the speed of vehicles via deri does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and device for determining the speed of vehicles via deri, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for determining the speed of vehicles via deri will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-363554