EP0384874A2 - Einrichtung zur Erfassung der Durchfahrt von Fahrzeugen auf einer Strasse mit einem piezoelektrischen Film - Google Patents

Einrichtung zur Erfassung der Durchfahrt von Fahrzeugen auf einer Strasse mit einem piezoelektrischen Film Download PDF

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Publication number
EP0384874A2
EP0384874A2 EP90470003A EP90470003A EP0384874A2 EP 0384874 A2 EP0384874 A2 EP 0384874A2 EP 90470003 A EP90470003 A EP 90470003A EP 90470003 A EP90470003 A EP 90470003A EP 0384874 A2 EP0384874 A2 EP 0384874A2
Authority
EP
European Patent Office
Prior art keywords
roadway
conductive
piezoelectric film
profile
plastic material
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.)
Granted
Application number
EP90470003A
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English (en)
French (fr)
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EP0384874B1 (de
EP0384874A3 (en
Inventor
Claude Maeder
Marc Nicolle
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.)
Electronique Controle Mesure
Original Assignee
Electronique Controle Mesure
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 Electronique Controle Mesure filed Critical Electronique Controle Mesure
Publication of EP0384874A2 publication Critical patent/EP0384874A2/de
Publication of EP0384874A3 publication Critical patent/EP0384874A3/fr
Application granted granted Critical
Publication of EP0384874B1 publication Critical patent/EP0384874B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G08G1/02—Detecting movement of traffic to be counted or controlled using treadles built into the road
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F11/00—Road engineering aspects of Embedding pads or other sensitive devices in paving or other road surfaces, e.g. traffic detectors, vehicle-operated pressure-sensitive actuators, devices for monitoring atmospheric or road conditions

Definitions

  • the present invention relates to a passage detection device, its installation method and its applications to the detection of passage of vehicles, to the classification of vehicles, to dynamic weighing, to speed measurement; this device consists in part of one or more strips of piezoelectric film.
  • the present invention aims to propose the realization of the piezoelectric film detection device, simple to place on or in the roadway, or removable from a metal part sealed in the roadway. It relates to a device for detecting passage on a roadway of the type comprising a ribbon of piezoelectric film, characterized in that it consists of a slightly curved flat profile in which the piezoelectric film is located; said profile being made of flexible plastic material or rubber.
  • the profile may also have the shape of a rectangular or trapezoidal tube, the upper face of which would be slightly curved.
  • the profile may also have the form of a flexible mat in which would be placed several strips of piezoelectric film, associated or not with other sensors such as induction loops.
  • the present invention also relates to devices and methods of fixing in and on the roadway; the devices described above can either be glued to the surface of the road, or glued in an opening slightly larger than the profile, or mechanically mounted in a dovetail system provided for this purpose, or glued in a bleeding.
  • Other laying methods can consist of nailing sorts of jumpers or with nails, the profile comprising the piezo film ribbon (s) electric.
  • the present invention also aims to achieve a general purpose sensor mat characterized in that it comprises two piezoelectric tapes placed parallel to each other, at a perfectly known distance and an induction loop ; the assembly thus produced makes it possible to identify the axles belonging to a given vehicle as well as to weigh the axles by processing the signals from each of the two piezoelectric tapes.
  • the senor is constituted by a ribbon (2) of piezoelectric film preferably made of flexible polymer material, placed between a ribbon (1) of very rigid material in the axis of movement of the vehicles "L” but forming a spring in the axis perpendicular to the movement of the vehicle "l” and a ductile conductor (3) of sufficient thickness not to break during the passage of the vehicles.
  • the conductor (3) will be held on the piezoelectric film (2) by a layer of conductive adhesive (4) previously deposited either on the piezoelectric film or on the conductor (3).
  • the assembly thus formed is then embedded by molding, extrusion or other process in a material (5) of the elastomer, polyurethane resin or rubber type having a hardness greater than 50 ShA.
  • the size of the parts used to make the sensor allows to produce finished assemblies (7) several meters in length, a few millimeters thick and 40 to 80 mm wide.
  • the layer of steel used as a support for the piezoelectric film ribbon is intended to considerably improve the quality of the signal supplied by the sensor by limiting the dynamic effect of the vehicle in the direction of its movement by eliminating the deformation of the sensor in the longitudinal direction "L” to take into account only the force "P".
  • the deformation along "l” will also be limited by the steel sheet (1).
  • the deformation according to "P” is also limited by using for the coating (5) a flexible plastic material sufficiently hard to avoid the sinking of the metal and the punching of the resin. We will look for a natural or synthetic rubber or any other elastic material having a hardness greater than 50 ShoreA.
  • the widths of the strips will be decreasing (2), being wider than (3,) and (1) wider that (2), and vice versa.
  • the entire sensor is connected to the electronics by a cable with 2 shielded conductors (11), one of the conductors is connected by mechanical means or by welding to the steel blade (1), the other to the strip conductive (3).
  • FIG. 1b shows a variant of the device according to the invention in which the strips of metal (1), of piezoelectric polymer (2) and the conductor (3) are held together by a layer (6) of adhesive material or heat shrink. The assembly is then molded in the material (5) to obtain a strip (7) of several meters in length, a few millimeters in height, and a few centimeters in width. The signal is transmitted to the electronic system (12) by a 2-conductor cable (11).
  • the conductive strip forming a spring consists of a stack of a strip (18) made of non-conductive material, for example plastic reinforced or not reinforced with glass fiber or carbon covered with a thin layer of copper (15) or aluminum.
  • FIG. 2 b and c are other variants of the device where the metal reinforcements (1) and (3) are pressed onto the film (2) by the coating material (6) and molded in the resin and connected to the two conductor cable (11); a probe (16) measures the temperature of the profile core (7), its signal is transmitted by a cable with two shielded conductors (17) to the electronic system in order to be able to correct the response of the system as a function of temperature.
  • FIG. 3 is a variant in which the conductive metal strip (1) is slightly bent on the two largest sides for the dual purpose of increasing its rigidity and of avoiding mechanically injuring the coating (5) and the film ( 2).
  • FIG. 4 is a variant in which the mounting of decreasing width is reversed with respect to FIG. 1.
  • Figure 5 is a variant in which the conductive metal strip spring (1) is bent over its two long lengths, the conductive tape (3) consists of a steel tape also spring and provided with two longitudinal folds to avoid cut the piezoelectric film (2) and to participate in the stiffening of the profile (7).
  • Figures 6 a and b show alternative molding of the system.
  • the sensor is constructed identically to that described above, but it is molded in the form of a rectangular or square parallelepiped (13) of approximately 30 x 30 m m and several meters in length.
  • the surface (14) in contact with the tires can be flat or provided with a slight boss parallel to the greatest length. This version is intended to be inserted into the roadway as described below.
  • FIG. 7 a a single sensor presented in a profile (7) or (13) is placed perpendicular to the traffic and connected to the detector (12) by the cable (11); such an arrangement makes it possible to count the axles, weigh the axles, discriminate the axles in several weight categories.
  • FIG. 7b two sensors presented in profiles (7) or (13) are placed parallel to each other perpendicular to the traffic, and connected by their cable (11) to the detectors (12). With such an installation, the speed of the vehicles can be measured; discriminate, count the axles and weigh them.
  • the two sensors (7) or (13) are associated with an induction loop (21) and make it possible to determine all of the parameters of vehicle circulation by vehicle, speed, weight, distance between axles, vehicle class.
  • Figures 8a and b given by way of non-limiting example, show two means of laying the profile (7) on the floor.
  • the profile (7) is glued by any known adhesive means (9) to the surface (8) of the road (20).
  • the profile (7) is covered by an adhesive sheet (10), whether or not recessed, which adheres both to the surface (8) of the roadway (20) and to the upper surface of the profile (7). by immobilizing it.
  • Figures 9a, b, c, and d are non-limiting examples showing means for fitting different forms of sensors for inclusion in the roadway.
  • the profile (13) has a boss of a few millimeters on the upper surface (14) and is bonded by a product (19) in a groove (21) formed in the roadway (20).
  • the profile (13) has an upper surface (14) in the shape of a nail and is glued in the groove (21) and on the surface (8) by a suitable adhesive (19).
  • the profile (13) is in the form of a trapezoid with a curved face (14); it is mounted in a support (22) sealed in the roadway (20) by lugs (25) or other systems, and held by two bars (23) forming a dovetail and blocking the profile by screwing (24) of the two bars on the part (22).
  • the signal from the sensor 7, conducted by the cable with two shielded conductors (11) has its impedance adapted by the circuit (26), the signal is then filtered (27 ) to eliminate any parasites or bounces of frequency greater than 100 Hz, then it is integrated by the circuit (28) to determine the area of the area surrounded by the signal, the value obtained is then compared by comparators (29 ) at thresholds set by potentiometers (31). The output of each comparator enters a monostable type circuit (30) generating a calibrated slot.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Traffic Control Systems (AREA)
EP19900470003 1989-02-09 1990-02-06 Einrichtung zur Erfassung der Durchfahrt von Fahrzeugen auf einer Strasse mit einem piezoelektrischen Film Expired - Lifetime EP0384874B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8901855 1989-02-09
FR8901855A FR2642775B1 (fr) 1989-02-09 1989-02-09 Dispositif de detection de passage de vehicules sur une chaussee a film piezo-electrique

Publications (3)

Publication Number Publication Date
EP0384874A2 true EP0384874A2 (de) 1990-08-29
EP0384874A3 EP0384874A3 (en) 1990-10-03
EP0384874B1 EP0384874B1 (de) 1994-06-01

Family

ID=9378736

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900470003 Expired - Lifetime EP0384874B1 (de) 1989-02-09 1990-02-06 Einrichtung zur Erfassung der Durchfahrt von Fahrzeugen auf einer Strasse mit einem piezoelektrischen Film

Country Status (3)

Country Link
EP (1) EP0384874B1 (de)
DE (1) DE69009226D1 (de)
FR (1) FR2642775B1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456325A1 (de) * 1990-05-11 1991-11-13 Thermocoax Einrichtung zur Erfassung von Daten durchfahrender Fahrzeuge auf einer Strasse
WO1994012730A1 (en) * 1992-12-02 1994-06-09 Awa Limited A surface mounted sensor
FR2745308A1 (fr) * 1996-02-28 1997-08-29 Vezon Paul Dispositif lumineux de signalisation routiere
FR2764421A1 (fr) * 1997-06-09 1998-12-11 Electronique Controle Mesure Dispositif de detection de passage de roues ou d'essieux sur une chaussee a usage unique ou multiple et ses procedes de pose et depose
EP1072874B1 (de) * 1999-07-17 2006-10-11 Contraco SA Verfahren und Vorrichtung zur Bestimmung des Fahrzeuggewichtes bei fahrendem Fahrzeug
CN102855763A (zh) * 2012-09-06 2013-01-02 北京交通发展研究中心 无线地磁车辆检测器外壳及检测器
WO2015166074A1 (fr) * 2014-05-02 2015-11-05 Compagnie Generale Des Etablissements Michelin Système d'évaluation de l'état d'un pneumatique
EP3460777A1 (de) * 2017-09-20 2019-03-27 Vestel Elektronik Sanayi ve Ticaret A.S. Warnsystem, verfahren zur steuerung und steuergerät

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016211102A1 (de) * 2016-06-22 2017-12-28 Robert Bosch Gmbh Konzept zum Erfassen von Verkehrsinformationen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1144406A (en) * 1966-02-18 1969-03-05 Franz Valentin Gebert Vehicle speed timing apparatus
FR2468694A1 (fr) * 1979-10-31 1981-05-08 Automatisme Cie Gle Installation de detection de passage d'objets pesants comportant un capteur piezo-electrique insere dans une chaussee et procede de realisation d'une telle installation
FR2471066A1 (fr) * 1979-12-07 1981-06-12 France Etat Procede d'implantation d'un dispositif de detection selective de vehicules dans une chaussee
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
FR2487555A1 (fr) * 1980-07-28 1982-01-29 Automatisme Cie Gle Detecteur de passage d'objets pesants sur une chaussee
FR2567550A1 (fr) * 1984-07-13 1986-01-17 Electronique Controle Mesure Preparation et pose de capteurs piezo-electriques coaxiaux dans une chaussee

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456325A1 (de) * 1990-05-11 1991-11-13 Thermocoax Einrichtung zur Erfassung von Daten durchfahrender Fahrzeuge auf einer Strasse
US5206642A (en) * 1990-05-11 1993-04-27 U.S. Philips Corporation Device for detecting data relating to the passage of vehicles on a road
WO1994012730A1 (en) * 1992-12-02 1994-06-09 Awa Limited A surface mounted sensor
FR2745308A1 (fr) * 1996-02-28 1997-08-29 Vezon Paul Dispositif lumineux de signalisation routiere
FR2764421A1 (fr) * 1997-06-09 1998-12-11 Electronique Controle Mesure Dispositif de detection de passage de roues ou d'essieux sur une chaussee a usage unique ou multiple et ses procedes de pose et depose
EP1072874B1 (de) * 1999-07-17 2006-10-11 Contraco SA Verfahren und Vorrichtung zur Bestimmung des Fahrzeuggewichtes bei fahrendem Fahrzeug
CN102855763A (zh) * 2012-09-06 2013-01-02 北京交通发展研究中心 无线地磁车辆检测器外壳及检测器
WO2015166074A1 (fr) * 2014-05-02 2015-11-05 Compagnie Generale Des Etablissements Michelin Système d'évaluation de l'état d'un pneumatique
FR3020680A1 (fr) * 2014-05-02 2015-11-06 Michelin & Cie Systeme d'evaluation de l'etat d'un pneumatique
CN106255606A (zh) * 2014-05-02 2016-12-21 米其林企业总公司 用于评估轮胎状况的系统
US10222299B2 (en) 2014-05-02 2019-03-05 Compagnie Generale Des Etablissements Michelin System for evaluating the condition of a tire
CN106255606B (zh) * 2014-05-02 2019-09-03 米其林企业总公司 用于评估轮胎状况的系统
EP3460777A1 (de) * 2017-09-20 2019-03-27 Vestel Elektronik Sanayi ve Ticaret A.S. Warnsystem, verfahren zur steuerung und steuergerät

Also Published As

Publication number Publication date
EP0384874B1 (de) 1994-06-01
EP0384874A3 (en) 1990-10-03
FR2642775A1 (fr) 1990-08-10
FR2642775B1 (fr) 1991-10-18
DE69009226D1 (de) 1994-07-07

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