EP0456325A1 - Einrichtung zur Erfassung von Daten durchfahrender Fahrzeuge auf einer Strasse - Google Patents

Einrichtung zur Erfassung von Daten durchfahrender Fahrzeuge auf einer Strasse Download PDF

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Publication number
EP0456325A1
EP0456325A1 EP91201078A EP91201078A EP0456325A1 EP 0456325 A1 EP0456325 A1 EP 0456325A1 EP 91201078 A EP91201078 A EP 91201078A EP 91201078 A EP91201078 A EP 91201078A EP 0456325 A1 EP0456325 A1 EP 0456325A1
Authority
EP
European Patent Office
Prior art keywords
cable
tube
piezoelectric
groove
diameter
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Withdrawn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
EP91201078A
Other languages
English (en)
French (fr)
Inventor
Pierre Gregoire
Gilles Bailleul
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.)
Thermocoax SAS
Koninklijke Philips NV
Original Assignee
Thermocoax SAS
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Thermocoax SAS, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Thermocoax SAS
Publication of EP0456325A1 publication Critical patent/EP0456325A1/de
Withdrawn legal-status Critical Current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
    • G08G1/065—Traffic control systems for road vehicles by counting the vehicles in a section of the road or in a parking area, i.e. comparing incoming count with outgoing count
    • 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
    • G08G1/02—Detecting movement of traffic to be counted or controlled using treadles built into the road
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/16—Rigid-tube cables

Definitions

  • the invention relates to a device for detecting data relating to the passage of vehicles on a roadway, comprising a piezoelectric cable and means for making this cable rigid and transmitting to it the stresses produced by the passage of vehicles.
  • the invention finds its application in the detection of passage of vehicles, the counting, the measurement of speeds, the measurement of the weights of vehicles and their classification and this in all regions having various climatic conditions and in particular severe (very hot, temperate climate or very cold).
  • Patent FR 2 482 340 describes a device for detecting passage on a road, its laying method and its application to speed detection.
  • This device is partly made up of a piezoelectric effect cable.
  • This cable is a shielded coaxial cable whose core and sheath are separated by a piezoelectric ceramic.
  • This device further comprises a rigid section having either the shape of a U or the shape of a rectangular quadrilateral whose upper face is curved. This profile is filled internally in a plastic form obtained hard by polymerization. The aim is to make the device rigid.
  • this device is coated on the three faces not in contact with the vehicles, with a U-shaped envelope made of flexible or hard plastic, for example a resin loaded with elastomer, to absorb vibrations. This arrangement is carried out in the factory.
  • the method of laying the device in the pavement comprises forming a groove in the roadway, of dimensions slightly larger than those of the device. Then the bottom and sides of the groove are coated with a flexible plastic material absorbing vibrations and finally the device is placed in the coated groove so as to fix it, while making it protrude slightly from the upper surface of the roadway.
  • the coating of the groove is not essential when the device already includes a plastic envelope made in the factory.
  • two devices can be made so as to form two parallel rigid branches spaced by a predetermined fixed distance, and installed in two grooves in the roadway.
  • a disadvantage of the aforementioned device known from the prior art is that its manufacture uses plastics, which are organic materials and are particularly sensitive to temperature variations.
  • an object of the invention is the detection of the speed of vehicles, but also, in addition to counting, the detection of the weights of moving vehicles and their classification.
  • the detection and analysis of this data is particularly important for the forecasting of new roads, new bridges, or pavements of all kinds, as well as for the forecasts concerning their maintenance.
  • the measurements are not reliable as regards the detection of the weight of the vehicles, since these measurements depend on the climatic conditions. Depending on the case, these measures may be non-repetitive, or even impossible in regions where the climatic conditions are severe.
  • An object of the present invention is to provide a device for detecting data relating to the passage of vehicles on a roadway, such as the detection of passage and the measurement of speed, as is done by the device known from the state of the technique, but also particularly data relating to the weight of moving vehicles to allow their classification.
  • the solution to this problem is to overcome the need to use organic materials, first in the manufacture of the detection device, and then in its method of installation in the pavement.
  • this problem is solved by means of a device as described in the preamble of claim 1, characterized in that the means consist of a cylindrical metallic tube of diameter greater than that of the piezoelectric cable, tube in the axis of which is arranged the piezoelectric cable, the space between the cable and the internal walls of the tube being filled with a compacted metal oxide powder.
  • Another advantage is that the compacted metal oxide powder transmits the required information very well to the piezoelectric cable, and is extremely less sensitive to climatic conditions than plastic.
  • the device according to the invention has an improved longevity because it is mechanically practically insensitive to climatic conditions, and much less sensitive to mechanical degradation.
  • Another object of the invention is to propose a simple and inexpensive installation method which is insensitive to climatic conditions.
  • this method is characterized in that a groove is made in the upper covering of a road, this groove having a depth substantially equivalent to the outside diameter of the tube, and a transverse dimension slightly greater than this diameter, and in that the device is fixed in the groove by mechanical means.
  • this method is characterized in that the mechanical means consist of corners pressing on the upper part of the tube disposed in the groove, these corners being slid further between the tube and the vertical walls of the groove and fixed to the pavement by screws.
  • the advantage of this process is that it is very easy to implement.
  • the groove does not need to have very strict dimensions.
  • the means used are within the reach of a person skilled in the art of mechanics and not of a specialist in plastics.
  • Considerable time is saved during installation: whereas it took 6 to 8 hours of laying work including the formation of a trench and the gluing of the known device, it now takes at most 3 hours to make the trench and fix the device by the corners.
  • the device can be easily recovered if necessary. For example, if the sensor has any breakdown, or is accidentally damaged, it is easily exchangeable. It can also be simply retrieved and moved if you no longer wish to take measurements at a first location on the road, but take them at a second location. The first bleeding can then be filled or covered with a metal bar.
  • the tube 6 an inexpensive, malleable metal, not degradable by oxidizing agents, such as aluminum, and, to make the filling material 5, a powder of magnesium oxide, or any other metal oxide which is easy to compress and transmitting the constraints well.
  • a coaxial shielded cable 2 will be chosen as the piezoelectric cable, comprising a metallic core insulated from a metallic sheath by a ceramic material with piezoelectric effect.
  • a piezoelectric cable which is particularly suitable for achieving the aims of the invention is the VIBRACOAX piezoelectric cable, Reference 30 P 1 C from the company THERMOCOAX (Suresnes - France).
  • the coaxial piezoelectric cable 2 is connected by a coaxial connector 12 to a coaxial transmission cable 11.
  • a reference cable RG 58 will be used in conjunction with the piezoelectric cable VIBRACOAX cited. Cu, from THERMOCOAX.
  • Each end of the tube 6 is preferably closed in a leaktight manner by plugs 10a, 10b, one of which for example 10b allows the transmission cable to pass through 11.
  • a small thickness of filling material 5 separates the other end from the piezoelectric cable 2, not connected, of the second plug, for example 10a.
  • the plugs will also preferably be made of aluminum.
  • the detection device obtained is rigid, waterproof and the stresses are very well transmitted to the piezoelectric cable. It is also highly mechanical and allows electrical signals to be recorded from the cable, the characteristics of which are almost completely independent of climatic conditions, hot, cold, temperate or humid.
  • the manufacturing process of the data detector device is in total manufacturing synergy with the piezoelectric cable itself. This cable, if it is a vibracoax, is described and its manufacturing process given in patent FR 2 109 176 of October 1970.
  • the method of manufacturing the detection device comprises the manufacture of a metal tube 6 said blank, of a malleable material, aluminum therefore having for this purpose very good properties, of diameter greater than the diameter of the finished device; the establishment of the cable 5, with its connector 12 and its connection cable 11; filling with the material 5 to 70% of its theoretical density, for example the magnesia oxide MgO; then reducing the diameter of the tube 6 by any technique known to those skilled in the art to produce this effect, such as hammering or rolling, until the device is obtained whose tube 6 has a reduced diameter and is perfectly rigid; finally the establishment of sealing plugs 10a, 10b.
  • a certain number of corners are thus put in place to hold the detection device, in a purely mechanical manner, in the groove 10.
  • the number of corners depends on the length L of the device (see FIG. 1b).
  • the length of the device can be provided as required from 0.2 m to 4 m inclusive. In fact the length is not limited. These dimensions are given purely by way of example as being most probably useful in the near future.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Traffic Control Systems (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)
EP91201078A 1990-05-11 1991-05-06 Einrichtung zur Erfassung von Daten durchfahrender Fahrzeuge auf einer Strasse Withdrawn EP0456325A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9005918 1990-05-11
FR9005918A FR2662006A1 (fr) 1990-05-11 1990-05-11 Dispositif de detection de donnees relatives au passage de vehicules sur une chaussee.

Publications (1)

Publication Number Publication Date
EP0456325A1 true EP0456325A1 (de) 1991-11-13

Family

ID=9396532

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91201078A Withdrawn EP0456325A1 (de) 1990-05-11 1991-05-06 Einrichtung zur Erfassung von Daten durchfahrender Fahrzeuge auf einer Strasse

Country Status (5)

Country Link
US (1) US5206642A (de)
EP (1) EP0456325A1 (de)
JP (1) JPH04231824A (de)
CA (1) CA2042086A1 (de)
FR (1) FR2662006A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0675472A1 (de) * 1994-03-30 1995-10-04 Thermocoax Einrichtung zur Erfassung von Daten durch fahrender Fahrzeuge auf einer Strasse
CN110853370A (zh) * 2019-12-03 2020-02-28 湖南湘中博一环境监测有限公司 一种高精度高稳定的线圈式双路车辆检测器

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5486820A (en) * 1992-12-18 1996-01-23 The Whitaker Corporation Traffic sensor having piezoelectric sensors which distinguish lanes
US6208268B1 (en) * 1993-04-30 2001-03-27 The United States Of America As Represented By The Secretary Of The Navy Vehicle presence, speed and length detecting system and roadway installed detector therefor
US5477217A (en) * 1994-02-18 1995-12-19 International Road Dynamics Bidirectional road traffic sensor
US5835027A (en) * 1996-11-07 1998-11-10 Tyburski; Robert M. Residual charge effect traffic sensor
US6526834B1 (en) 2000-08-23 2003-03-04 Measurement Specialties, Incorporated Piezoelectric sensor
US20080061959A1 (en) * 2002-06-11 2008-03-13 Intelligent Technologies International, Inc. Structural monitoring
US8994546B2 (en) 2002-06-11 2015-03-31 Intelligent Technologies International, Inc. Remote monitoring of material storage containers
US20050127677A1 (en) * 2003-12-03 2005-06-16 Luttrull Jeffrey K. Roadway generating electrical power by incorporating piezoelectric materials
SI1806710T1 (sl) * 2005-12-29 2010-06-30 Aldo Tonelli Senzor integriran v sloju cementnega materiala tlaka in varnostni sistem ki vključuje tak senzor
US20070241872A1 (en) * 2006-04-12 2007-10-18 Legen Technology Company Tire detecting device
US8476798B2 (en) * 2008-11-28 2013-07-02 Pratt & Whitney Canada Corp. Tandem electric machine arrangement
DE102012217797A1 (de) 2012-09-28 2014-04-03 Lufthansa Technik Ag Kommunikationssystem in einem Flugzeug
DE102015202780A1 (de) * 2015-02-17 2016-08-18 Robert Bosch Gmbh Sensorvorrichtung
DE102015202781A1 (de) * 2015-02-17 2016-08-18 Robert Bosch Gmbh Sensorvorrichtung
GB2546116A (en) * 2016-01-11 2017-07-12 Infomode Ltd Piezo strip activated vehicle lighting system
DE102016211102A1 (de) * 2016-06-22 2017-12-28 Robert Bosch Gmbh Konzept zum Erfassen von Verkehrsinformationen
FR3088759B1 (fr) * 2018-11-16 2020-10-23 Innovative Resources Dispositif de comptage dynamique de vehicules ameliore
EP3839447B1 (de) * 2019-12-16 2023-06-07 Kistler Holding AG Wim-kraftaufnehmer und gehäuseprofil für solch einen wim-kraftaufnehmer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2471066A1 (fr) * 1979-12-07 1981-06-12 France Etat Procede d'implantation d'un dispositif de detection selective de vehicules dans une chaussee
EP0145060A2 (de) * 1983-11-21 1985-06-19 Thermocoax Herstellungsverfahren für ein abgeschirmtes Kabel mit mineralischer Isolierung
EP0287250A2 (de) * 1987-04-02 1988-10-19 Franz Josef Gebert Verkehrsmessanlage
EP0384874A2 (de) * 1989-02-09 1990-08-29 Electronique Controle Mesure Einrichtung zur Erfassung der Durchfahrt von Fahrzeugen auf einer Strasse mit einem piezoelektrischen Film

Family Cites Families (6)

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GB691659A (en) * 1950-10-03 1953-05-20 Philips Electrical Ind Ltd Improvements in or relating to wire-shaped objects comprising a core and a sheath with magnetic powder in between
BE510832A (de) * 1951-07-30 1952-05-15
GB1215388A (en) * 1968-10-18 1970-12-09 Pyrotenax Ltd Improvements in electric cables
SU568064A1 (ru) * 1975-08-07 1977-08-05 Государственный Дорожный Проектно-Изыскательский И Научно-Исследовательский Институт Устройство дл подсчета количества автомобилей
FR2482340A1 (fr) * 1980-05-08 1981-11-13 Electronique Controle Mesure S Dispositif de detection de passage sur une chaussee, son procede de pose et son application a la detection de vitesse
US4943805A (en) * 1986-11-13 1990-07-24 Dennison James L Conduit-enclosed induction loop for a vehicle detector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2471066A1 (fr) * 1979-12-07 1981-06-12 France Etat Procede d'implantation d'un dispositif de detection selective de vehicules dans une chaussee
EP0145060A2 (de) * 1983-11-21 1985-06-19 Thermocoax Herstellungsverfahren für ein abgeschirmtes Kabel mit mineralischer Isolierung
EP0287250A2 (de) * 1987-04-02 1988-10-19 Franz Josef Gebert Verkehrsmessanlage
EP0384874A2 (de) * 1989-02-09 1990-08-29 Electronique Controle Mesure Einrichtung zur Erfassung der Durchfahrt von Fahrzeugen auf einer Strasse mit einem piezoelektrischen Film

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ELECTRONIQUE INDUSTRIELLE, no. 30, 15 mars 1982, pages 73-75; P. COVILLE: "Câbles piézo-électriques: de nombreuses possibilités en mesure" *
INSTRUMENTS AND CONTROL SYSTEMS, vol. 56, no. 7, juillet 1983, pages 43-44; H.L. TRIETLEY: "Need a T/C or RTD in a hurry?" *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0675472A1 (de) * 1994-03-30 1995-10-04 Thermocoax Einrichtung zur Erfassung von Daten durch fahrender Fahrzeuge auf einer Strasse
US5668540A (en) * 1994-03-30 1997-09-16 U.S. Philips Corporation Detection device for data relating to the passage of vehicles on a road
CN110853370A (zh) * 2019-12-03 2020-02-28 湖南湘中博一环境监测有限公司 一种高精度高稳定的线圈式双路车辆检测器

Also Published As

Publication number Publication date
US5206642A (en) 1993-04-27
JPH04231824A (ja) 1992-08-20
FR2662006A1 (fr) 1991-11-15
CA2042086A1 (en) 1991-11-12

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