EP0770978B1 - Système de détection de masses métalliques - Google Patents
Système de détection de masses métalliques Download PDFInfo
- Publication number
- EP0770978B1 EP0770978B1 EP19960402242 EP96402242A EP0770978B1 EP 0770978 B1 EP0770978 B1 EP 0770978B1 EP 19960402242 EP19960402242 EP 19960402242 EP 96402242 A EP96402242 A EP 96402242A EP 0770978 B1 EP0770978 B1 EP 0770978B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- detection system
- detector
- detectors
- detection
- 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.)
- Expired - Lifetime
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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
- G08G1/015—Detecting movement of traffic to be counted or controlled with provision for distinguishing between two or more types of vehicles, e.g. between motor-cars and cycles
-
- 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 defined in the claims relates to a mass detection system of metal and in particular of vehicles. She is more particularly applicable to the detection and counting of vehicles on tracks as well as in car parking lots. A similar system is disclosed in document WO-A-9 528 693.
- the invention relates to a system whose installation does not require to stop traffic.
- the system of the invention is protected from bad weather and exterior damage.
- the sensor can be removed and replaced from the edge of the roadway, which facilitates greatly maintenance work.
- the detection system comprises a detector sensitive to the intensity and orientation of the magnetic field.
- a detector placed at a determined point in space for example in a carriageway road traffic, is subject to an ambient magnetic field.
- magnetic mass such as an automobile
- the magnetic field lines configuration is modified because the field magnetic tends to take a longer course magnetic permeability.
- an automobile may include magnetic masses. The direction of the magnetic field in the detector, and possibly its intensity is therefore modified and the magnetic detector detects this magnetic mass.
- Sensors sensitive to the direction of the magnetic field are made for example using an element based on magneto-resistive material a simplified representation of which is given in FIG. 1. It comprises mainly an MR plate in magneto-resistive material placed according to an xOy plan. Connection wires f1, f2 connected to two ends of the detector to measure the resistance of the wafer along the axis Ox. When the component of the magnetic field in the xOy plane and more precisely along the axis Oy varies, the resistivity of the magneto-resistive material varies and the resistance measurement of the MR insert gives an indication of the variation of the magnetic field.
- the invention therefore provides means to orient in a determined way and fix the plate in its environment.
- the plate is placed in the DEC box and is immobilized in this case.
- the housing has means called "polarizing" in the art, to give it a planned orientation to advance.
- FIG. 2a represents a system using a sensor sensitive to the orientation of the magnetic field such as that of Figure 1. It has a TUB tube in which the DEC detector can slide.
- the TUB tube has means which cooperate with the key of the DEC detector so that it always has the same orientation in the tube, whatever or its position along the axis of the tube.
- the key of the DEC detector can be linked to its shape, parallelepipedic for example.
- Figure 2b there is shown an example that the tube has a square inner section and the detector has a square shape.
- the detector once inserted with an orientation suitable in the tube, will keep this orientation when sliding into the tube to bring it to the desired detection point.
- the invention is applicable to the detection of the passage of vehicles on a road lane.
- a hole is drilled in the pavement (see Figure 3), transverse to the direction of the roadway and parallel to the running surface of vehicles, 15 cm for example from the surface.
- a TUB tube is inserted in this hole and one or more detectors DEC1, DEC2 are inserted into the TUB tube.
- Drilling the hole parallel to the road surface is not always possible when there is not, for example, a side gap either side of the road, or at motorway toll booths.
- We are planning then drill a diagonal hole in the pavement see Figure 4).
- the tube TUB is placed in this hole and a detector is inserted into the tube.
- the inclination of the hole and therefore of the tube is calculated so that the detectors based on their sensitivity can detect vehicles.
- the TUB tube can be placed in the pavement at a depth between 1 cm and 1 meter.
- a groove of the width of the tube TUB as shown in Figure 2c.
- the TUB tube is then placed easily in the bottom of the groove and is covered with a material of filling (bitumen or plastic material). We show that, placed at about 1 meter deep, such a detector is still effective.
- the same tube can contain several detectors. If the roadway has several lanes of traffic, so it is possible to detect vehicles on the different lanes with one detector per lane. We may also have more detectors than there are ways to detect vehicles traveling on horseback on two lanes. For example, like shown schematically in Figure 5, there is on each channel a detector in the middle of the lane and a detector at the separation limit tract.
- This system is applicable in parking lots covered and / or underground automobiles. In this case, we can plan to fix the tube at the ceiling of the parking lot which avoids work in the parking lot floor.
- Figure 6a is applicable in particular to a toll where each vehicle is channeled in its lane. We therefore knows the passage area of the vehicle wheels and in this zone we have a detector at a step less than the width of a tire, all 15 cm for example to detect twin wheels of trucks.
- Figure 6b shows a profile of detection values provided by such a detection assembly which corresponds to the detection of a truck with twin wheels.
- the area “a” of the curve corresponding to the width of the truck.
- Zones “b0” and “b1” correspond to two wheel spans and the zone “c” corresponds to the space between the two twin wheels.
- Figures 6c and 6d correspond to the detection of a tourism and according to the same principle the zones d, e0, e1, f correspond respectively to the width of the vehicle, the wheels and the space between wheels.
- FIG. 6e represents a circuit for analyzing the signals d1, d2, d3, ... supplied by the various detectors D1, D2, D3, ... Dn.
- an analysis circuit provides the signals d1, d2, d3, d4, .. and that below this threshold, it provides the signals d1 , d2 , d3 , d4 .
- the system can therefore deduce the width of the vehicle by function of the number of signals above the threshold ds.
- the system will thus both know the width of the vehicle and detect twin wheels.
- the system observes the number of consecutive detectors which provide signals above the threshold ds' (for example, in the figure 6b: from 2.d'3 on the one hand, and from 7.d'8 on the other hand).
- a tube TUB1 can be arranged along the traffic lane of a traffic lane and contain at least two detectors distant from each other by a length less than the length normal vehicle.
- a detector may not detect metallic masses.
- two detectors DEC1, DEC2 are provided, spaced about 50 cm to 2 m, arranged along the axis of the parking lot. Under these conditions, the detection logic circuit will supply the information in the event of detection.
- Such a system will thus, by interrogating the detectors, identify the presence or absence of a vehicle in a park site parking.
- FIG. 8 thus represents a channel of a toll station and two detectors DEC1, DEC2.
- the two detectors DEC1, DEC2 are spaced apart by a distance preferably less than the length of a vehicle or, strictly speaking, slightly greater than the length of the vehicle.
- the sequence of signals may be as follows:
- the system is therefore able to detect a vehicle that is reversing after entering a particular area such as a toll area. For this, it records the last two sequences and each new sequence is compared to the oldest recorded sequence. If there is identity, the system deduces that the vehicle has backed up.
- the detector is expected to have three sensitive elements placed in perpendicular planes as is shown in Figures 9a and 9b.
- the sensitive elements are arranged in three planes perpendicular to each other.
- the two sensitive elements D1 and D3 are in the same plane (or in parallel planes) and are oriented to detect components of perpendicular magnetic field.
- the sensitive element D2 is located according to a plane perpendicular to that of elements D1 and D3.
- Such a sensor is placed as described above in a tube buried in the roadway. It makes it possible to detect with great certainty the presence of a vehicle without being dependent on irregularities in the metal masses of the vehicle.
- a rigid or semi-rigid cable which can be a cable containing wires for transmitting signals from detection of sensors.
- a multiplexer MUX controlled by a "MUX command” successively transmits the different detection signals, by amplification to a circuit of processing which provides detection information.
- the different detectors are not physically arranged in series.
- Figure 11 shows an arrangement whereby several detectors are connected by separate wires to the MUX multiplexing circuit.
- the detectors must be placed in series in a tube or distributed in different points of an installation, they are addressed by the same series of wires of the transmission bus type (4 wires may be sufficient for a set of detectors).
- the MUX circuit transmits successively the addresses of the various detectors. For each address transmitted, a detector recognizes its address and transmits back a signal indicating its state of detection.
- the central processing circuit CC therefore successively knows the states of the different detectors and can carry out the detection processing operations described above.
- a digital link between the detectors and the circuit central CC processing requires a circuit in each detector CE electronic capable of recognizing his address sent to him by the CC central circuit and allowing it to connect to the bus to transmit its state.
- FIG. 12b represents an exemplary embodiment of such a detector. It has an INT interface circuit connected to the bus BUS transmission and allowing the connection of a local processing circuit CCL on the bus to receive information from the bus and to transmit in exchange, on this bus, the identity of the detector and the state of the detector.
- the DEC detector is connected to the local processing circuit by an amplifier.
- Figures 13a and 13b show an alternative embodiment according to the invention allowing to set up detectors in a tube.
- a flexible REG bar is provided, the width L1 of which is slightly less than the horizontal interior width L2 of the TUB tube.
- the strip can thus be slid into the bottom of the tube while being guided laterally.
- One or more DEC1 detectors are attached to the strip. DEC2. This fixing can be done by any suitable means.
- the detectors are fixed to the strip by means of adhesive tapes.
- the detectors are represented in the form of housings.
- the detectors could be fixed without housing on the strip.
- a circuit board printed matter carrying the sensitive element of the detector and its circuits connection could be glued directly to the strip.
- Figure 13b highlights that the slider can be flexible enough to allow handling and insertion into the tube. However, unrolled and flat in the tube, it has rigidity sufficient to be pushed into the tube. The length of the strip is calculated to allow the positioning of detectors in areas appropriate pavement.
- the detectors DEC1 and DEC2 are fixed on the REG strip at positions which will correspond to their position in the roadway.
- the strip carrying the detectors is then slid into the tube by an OR sight glass provided in the pavement and detectors are in the positions provided in the floor.
- FIG. 14 represents an alternative embodiment according to which two tubes TUB1 and TUB2 are provided which are mutually parallel and transverse with respect to the longitudinal direction of the roadway.
- Each tube contains at least one detector per traffic lane.
- the distance D between the two tubes is such that each detector can detect the passage of a vehicle at clearly differentiated moments.
- the electronic system operating these detectors will then be equipped with a clock.
- the times of detection of a vehicle by the two detectors of the taxiway of the vehicle will be registered.
- a calculation circuit by reporting the distance D of the two tubes and the difference in detection times, will get the vehicle speed.
- the distance D between two tubes can be 1 meter for example.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Traffic Control Systems (AREA)
Description
- au moins un détecteur magnétique sensible à la direction du champ magnétique ;
- au moins un tube placé à proximité des masses métalliques à détecter dans lequel peut coulisser au moins un détecteur magnétique ;
- la figure 1, un exemple de détecteur magnétique utilisé dans le cadre de l'invention ;
- les figures 2a à 2c, un exemple de système selon l'invention ;
- les figures 3, 4 et 5, des exemples de dispositions de l'invention transversalement à une chaussée de circulation ;
- les figures 6a à 6e, un système de détection à détecteurs multiples ;
- la figure 7, un système de détection applicable à une installation de parcs automobiles ;
- la figure 8, un système de détection applicable à une installation de péage pour détecter toute circulation en marche arrière d'un véhicule ;
- les figures 9a et 9b, un détecteur tridimensionnel de champ magnétique ;
- les figures 10 et 11, un système de multiplexage analogique des détecteurs ;
- les figures 12a, 12b, un système de multiplexage numérique des détecteurs ;
- les figures 13a, 13b, une variante du système de mise en place des détecteurs selon l'invention ;
- la figure 14, un arrangement de détecteurs pour la mesure de vitesse de véhicules.
et dans le cas de la figure 6d, on aura :
- Le tube utilisé est un tube de section parallélépipédique (rectangulaire ou carrée) tel qu'on en trouve dans le commerce. Il n'a pas besoin d'être conçu spécialement pour ce système ;
- La pose du tube dans la chaussée ne nécessite pas de précautions particulières autres que celles de le mettre à plat dans la chaussée sans moyens et indications d'orientation du tube et l'installateur n'a pas de précaution particulière à prendre lorsqu'il pose le tube dans la chaussée ; La forme carrée ou rectangulaire du tube est donc particulièrement intéressante. De plus, le tube peut être placé dans une saignée rectangulaire de la largeur du tube (voir figure 2c) pratiquée à la tronçonneuse dans la chaussée ;
- Le détecteur n'a pas besoin de moyens de guidage particulier. Il suffit qu'il soit dans un boítier ayant des dimensions légèrement inférieures à la section intérieure du tube ou être sur une réglette de guidage ;
- La section rectangulaire ou carrée du tube présente l'avantage d'être mois sujette à déformation que toute autre forme
Claims (15)
- Système de détection de masses métalliques, comportant :au moins un détecteur magnétique sensible à la direction du champ magnétique ;au moins un tube placé à proximité des masses métalliques à détecter dans lequel peut coulisser au moins un détecteur magnétique ;
- Système de détection selon la revendication 1, caractérisé en ce que le détecteur a une forme polygonale et que le tube a une section similaire.
- Système de détection selon la revendication 2, caractérisé en ce que le tube a une section de forme rectangulaire ou carrée.
- Système de détection selon la revendication 1, caractérisé en ce que le tube est situé dans le sol sur lequel se déplace des véhicules en travers de la chaussée de circulation routière ou bien est fixé au plafond d'un parc de stationnement automobiles couvert et/ou souterrain.
- Système de détection selon la revendication 4, caractérisé en ce que la position du tube dans le sol est en biais ou est parallèle à la surface du sol.
- Système de détection selon la revendication 1, caractérisé en ce que les moyens complémentaires comportent une réglette (REG) sur laquelle sont fixés un ou plusieurs détecteurs (DEC1, DEC2), la réglette étant glissée dans le tube (TUB), sa largeur (L1) étant légèrement inférieure à la dimension intérieure horizontale (L2) de la section du tube et sa longueur étant suffisante pour placer les détecteurs dans des positions déterminées dans le tube.
- Système de détection selon la revendication 4, caractérisé en ce qu'il comporte plusieurs détecteurs placés dans le tube.
- Système de détection selon la revendication 7, caractérisé en ce que la distance entre deux capteurs voisins est inférieure ou sensiblement égale à la largeur normale d'un pneu de véhicule, de façon à détecter des roues jumelées de véhicules.
- Système de détection selon la revendication 8, caractérisé en ce que les détecteurs sont placés dans le tube par une extrémité d'entrée du tube et peuvent être déplacés vers l'extrémité opposée du tube, en ce que le boítier de chaque détecteur permet le passage des fils de détection de l'extrémité d'entrée du tube vers les détecteurs placés vers l'extrémité opposée et en ce que les détecteurs sont reliés par un câble permettant de maintenir constante la distance entre les différents détecteurs.
- Système de détection selon l'une des revendications 1 ou 4, caractérisé en ce que le tube est orienté parallèlement à la direction de déplacement du véhicule et en ce qu'il comporte au moins deux détecteurs placés dans le tube et espacés d'une distance inférieure ou légèrement supérieure à la longueur normale d'un véhicule et supérieure à 50 cm.
- Système de détection selon l'une quelconque des revendications précédentes, caractérisé en ce que chaque détecteur comporte un élément sensible magnéto-résistif dont la résistivité varie selon la valeur et l'orientation du champ magnétique dans l'élément sensible.
- Système de détection selon la revendication 5, caractérisé en ce que le tube est situé dans le sol a une profondeur comprise entre 1 cm et 100 cm.
- Système de détection selon la revendication 8, caractérisé en ce qu'il prévoit un premier seuil de détection (ds) pour la détection d'un véhicule, et un deuxième seuil de détection pour la détection des roues du véhicule.
- Système de détection selon la revendication 1, caractérisé en ce qu'il comporte des moyens pour détecter les deux dernières séquences de signaux de détection et pour fournir un signal (d'indication de recul du véhicule) lorsqu'une troisième séquence de signaux détectée est identique à la première séquence de signaux.
- Système de détection selon la revendication 4, caractérisé en ce qu'il comporte au moins deux tubes (TUB1, TUB2) parallèles entre eux et transversaux par rapport à la direction longitudinale de la chaussée, chaque tube pouvant contenir au moins un détecteur par voie de circulation et la distance (D) entre les deux tubes étant telle qu'elle permette à un système électronique d'exploitation des détecteurs d'identifier les instants de détection d'un véhicule par un détecteur de chaque tube et de calculer la vitesse du véhicule.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9512717 | 1995-10-27 | ||
FR9512717A FR2740592B1 (fr) | 1995-10-27 | 1995-10-27 | Systeme de detection de masses metalliques |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0770978A1 EP0770978A1 (fr) | 1997-05-02 |
EP0770978B1 true EP0770978B1 (fr) | 2002-02-06 |
Family
ID=9483999
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19960402242 Expired - Lifetime EP0770978B1 (fr) | 1995-10-27 | 1996-10-22 | Système de détection de masses métalliques |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0770978B1 (fr) |
DE (1) | DE69619053D1 (fr) |
FR (1) | FR2740592B1 (fr) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9903783D0 (en) * | 1999-02-18 | 1999-04-14 | Univ Edinburgh | Vehicle detector and classifier |
FR2790834B1 (fr) * | 1999-03-12 | 2004-06-25 | Philippe Gendrier | Systeme d'imagerie magnetique par reseau matriciel de magnetometres |
DE10048362C2 (de) * | 2000-09-29 | 2003-05-15 | Reinhard Zachmann | Verfahren und Anordnung zur Erfassung von Verkehrsdaten mittels Detektion und Klassifikation sich bewegender oder stehender Fahrzeuge |
ES2180410B1 (es) * | 2001-02-22 | 2004-09-16 | Juan Jose Salamanca De La Barrera | Detector de bombas lapa. |
US20050035880A1 (en) * | 2001-09-27 | 2005-02-17 | Roland | Inductive loop detector |
EP1628275A1 (fr) * | 2004-08-20 | 2006-02-22 | JADE Beheer B.V. | Détecteur pour boucles à induction |
FR2896070B1 (fr) | 2006-01-11 | 2008-02-15 | Commissariat Energie Atomique | Systeme magnetique de controle de trafic |
FR3035256B1 (fr) * | 2015-04-16 | 2018-05-25 | Innovative Technologies | Dispositif de comptage de vehicules des usagers dans un parc de stationnement |
CN106355898B (zh) * | 2016-11-04 | 2020-10-09 | 南京理工大学 | 基于地磁传感的测速方法及装置 |
EP3567351A1 (fr) * | 2018-05-08 | 2019-11-13 | Kistler Holding AG | Capteur wim doté des capteurs de champ magnétique |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3733099A1 (de) * | 1987-09-30 | 1989-04-13 | Forster Klaus | Verfahren zur freiplatz-anzeige in parkeinrichtungen |
DE4234548C1 (de) * | 1992-10-14 | 1993-09-30 | Ant Nachrichtentech | Anordnung zum Erfassen von Verkehrsgrößen |
JP3375968B2 (ja) * | 1994-04-19 | 2003-02-10 | ハネウエル・インコーポレーテッド | 磁力計車両検出器 |
-
1995
- 1995-10-27 FR FR9512717A patent/FR2740592B1/fr not_active Expired - Fee Related
-
1996
- 1996-10-22 EP EP19960402242 patent/EP0770978B1/fr not_active Expired - Lifetime
- 1996-10-22 DE DE69619053T patent/DE69619053D1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0770978A1 (fr) | 1997-05-02 |
FR2740592B1 (fr) | 1997-11-21 |
DE69619053D1 (de) | 2002-03-21 |
FR2740592A1 (fr) | 1997-04-30 |
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