EP0570755A1 - Boucle à induction disposée dans le revètement routier ou similaire - Google Patents

Boucle à induction disposée dans le revètement routier ou similaire Download PDF

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Publication number
EP0570755A1
EP0570755A1 EP93107192A EP93107192A EP0570755A1 EP 0570755 A1 EP0570755 A1 EP 0570755A1 EP 93107192 A EP93107192 A EP 93107192A EP 93107192 A EP93107192 A EP 93107192A EP 0570755 A1 EP0570755 A1 EP 0570755A1
Authority
EP
European Patent Office
Prior art keywords
loop
induction loop
induction
inductance
detector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP93107192A
Other languages
German (de)
English (en)
Inventor
Lutz Dipl.-Ing. Breitkreuz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airbus Defence and Space GmbH
Original Assignee
Deutsche Aerospace AG
Daimler Benz Aerospace AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deutsche Aerospace AG, Daimler Benz Aerospace AG filed Critical Deutsche Aerospace AG
Publication of EP0570755A1 publication Critical patent/EP0570755A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors

Definitions

  • the invention relates to an induction loop according to the preamble of claim 1.
  • induction loops arranged in lanes are generally known.
  • the operation of such induction loops can be seen from Siemens data sheet 1/91.
  • an inductive loop in the road is traversed by alternating current (approx. 40 ... 100 kHz), which an oscillator generates on the module.
  • the loop inductance L together with the feed line determine the frequency.
  • This loop current results in an alternating magnetic field in the area of perception of the loop, which generates eddy currents in the metal parts of a vehicle located there, which in turn influence the alternating field, so that the loop inductance decreases. This results in an increase in the loop frequency.
  • the change in the loop inductance defined as "loop detuning" dL / L, is used for vehicle detection and is measured by the detector. The sensitivity of the detector is pre-selected in 3 or 2 steps. To record only motor vehicles, the correct response threshold is set automatically by "observing" the passing vehicles (learning effect).
  • a detector module contains two evaluation circuits for one inductive loop each, which are fed by separate loop generators. To avoid mutual interference, different frequencies (channels) are used. They can be selected using rotary switches. The adjustment takes place automatically.
  • the detector works with a specially developed, application-specific circuit (ASIC), which enables a very fast frequency measurement, and a microprocessor, the program of which determines the detector function.
  • ASIC application-specific circuit
  • the detector issues messages about the occupancy of the loop, with double loops also about the direction of travel, vehicle speed and vehicle type, as well as error messages.
  • states or values can also be queried via a serial interface.
  • the length of the supply lines between the induction loop and the detector is limited to approximately 150 m, in the case of a signal which is constantly deteriorating with supply lines becoming longer and longer.
  • a loop detector is also limited to this distance, as described on page 3 of a brochure by Weiss-Electronic GmbH, D-5500 Trier.
  • the invention is therefore based on the object of improving an induction loop of the type mentioned at the outset in such a way that larger distances of, for example, 750 m to 1250 m can be chosen between the induction loop and the detector.
  • the object is achieved in that the capacitor of the resonant circuit in the immediate vicinity the induction loop is arranged, and that for feeding the electrical energy into the resonant circuit, the inductance is arranged spatially distant from the induction loop and is electrically conductively connected to the terminals thereof via long leads.
  • An advantage of the invention lies in particular in the use of a plurality of induction loops one behind the other in the direction of the lane in the saving of a large number of switch cabinets and their energy supply.
  • An advantage can also be seen in a qualitative signal improvement even with longer supply lines than before between the detector and the induction loop.
  • L s shows a three-turn induction loop L s , the inductance of which is approximately 120 ⁇ H.
  • the terminals of this loop are arranged in a sleeve 1 and connected via a two-wire line 2 of a maximum length of 150 m (z. B. Telecommunications cable with about 800 uH / m) to a detector 3, which contains a transmitter and receiver part.
  • the transmitter contains the capacitor C s belonging to the resonant circuit and an inductive transformer, denoted by L u , which is controlled via transistors 4 and 5 with a transmission pattern.
  • the receiver has a reception winding 6, which belongs to L ü , and an evaluation device 7 arranged downstream of this coil.
  • the resonant circuit is excited with a few pulses and then continues to oscillate automatically in its resonance frequency.
  • the reason for the length limitation of the lead 2 lies in its inductance, which acts like a series connection to the induction loop L s .
  • the resonant circuit is thus formed by the inductance of the induction loop L s , by the inductance of the transformer L ü and the capacitor C s , so that the influence of a change in the inductance of the loop L s , that is to say the loop detuning, decreases with the length of the lead 2.
  • the quality of the resonant circuit consisting of C s and L s is also impaired by the transmission losses of the transformer L ü , in particular because the constant reloading of the energy between C s and L s must take place via the transformer.
  • the inventive arrangement shown in Fig. 2 differs from that of FIG. 1 in that the capacitor C s of the resonant circuit is arranged in the immediate vicinity of the induction loop L s , and that for feeding the electrical energy into the induction loop L s, the inductance of Transmitter L ü is used, that is, the resonant circuit of induction loop L s and capacitor C s arranged spatially distant and with their terminals via a long lead 2 of z. B. 750 m to 1250 m is electrically connected.
  • the immediately adjacent arrangement of the induction loop L s and capacitor C s is aimed at an ideal resonant circuit in which the electrical energy is transmitted via the lead 2 to the capacitor C s .
  • the resonant circuit vibrates with high quality. It does not constantly, as after Figure 1, electrical power on the supply line 2 and transmitter L u between the inductive loop L s and are transmitted to the capacitor C s; rather, the supply line 2 mainly acts as a measuring line.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Traffic Control Systems (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
EP93107192A 1992-05-21 1993-05-04 Boucle à induction disposée dans le revètement routier ou similaire Withdrawn EP0570755A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924216820 DE4216820A1 (de) 1992-05-21 1992-05-21 In einer Fahrbahn oder dergleichen angeordnete Induktionsschleife
DE4216820 1992-05-21

Publications (1)

Publication Number Publication Date
EP0570755A1 true EP0570755A1 (fr) 1993-11-24

Family

ID=6459419

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93107192A Withdrawn EP0570755A1 (fr) 1992-05-21 1993-05-04 Boucle à induction disposée dans le revètement routier ou similaire

Country Status (2)

Country Link
EP (1) EP0570755A1 (fr)
DE (1) DE4216820A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3576525A (en) * 1967-07-17 1971-04-27 Singer General Precision Inductive loop vehicle presence detector
GB1513275A (en) * 1974-10-09 1978-06-07 Ericsson Telefon Ab L M Detecting metal-containing objects
FR2469722A1 (fr) * 1979-11-12 1981-05-22 Saxby Dispositif detecteur de masses metalliques comportant des moyens de securite
FR2494655A1 (fr) * 1980-11-27 1982-05-28 Robert Jean Procede et dispositifs electroniques pour detecter les passages d'un mobile metallique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3576525A (en) * 1967-07-17 1971-04-27 Singer General Precision Inductive loop vehicle presence detector
GB1513275A (en) * 1974-10-09 1978-06-07 Ericsson Telefon Ab L M Detecting metal-containing objects
FR2469722A1 (fr) * 1979-11-12 1981-05-22 Saxby Dispositif detecteur de masses metalliques comportant des moyens de securite
FR2494655A1 (fr) * 1980-11-27 1982-05-28 Robert Jean Procede et dispositifs electroniques pour detecter les passages d'un mobile metallique

Also Published As

Publication number Publication date
DE4216820A1 (de) 1993-11-25

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