ES2443081A2 - Automatic identification of vehicles using rfid with inductive loop detector (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Automatic identification of vehicles through rfid with inductive loop detector. It is a system of automatic identification of vehicles (avi) by radiofrequency identification technology with inductive loop detector (ild). Based on the existing infrastructure on the roads for traffic drawings that mainly use inductive loops, a modification of the detector equipment integrates, in addition to the existing functions of density measurement, occupation and classification of vehicles, the function of automatic identification of vehicles, that allows its use in applications of control, supervision, security, payment, etc. Figure 1 shows a block diagram of the invention, consisting of a coil constituted by one or several loops (1), two interconnecting wires (2), a switch circuit (3) that connects the inductive loop reader ( 4) or the rfid reader (5). The blocks (3), (4) and (5) constitute the integrated detector (6). (Machine-translation by Google Translate, not legally binding)

Description

Automatic vehicle identification via RFID with inductive loop detector

OBJECT OF THE INVENTION

The object of the invention is the Automatic Vehicle Identification (AVI) by means of Radio Frequency Identification (RFID) technology with Inductive Loop Detector (lLD). The technology of the Inductive Loop Detectors (ILD) is fully extended and in use at this time, and would be used to incorporate Automatic Vehicle Identification (AVI) using Radio Frequency Identification (RFID) technology (well known).

SECTOR OF THE TECHNIQUE

The invention belongs to the industrial sector of vehicle traffic control and supervision systems, also affecting that of vehicle manufacturers.

BACKGROUND OF THE INVENTION

Automatic Vehicle Identification (AVI) based on Radio Frequency Identification (RFID) is the fastest and safest way of remote identification to control and monitor vehicle traffic, parking, security, etc. It is based on the installation in each vehicle of an RFID tag (tag) that fully identifies it.

RFID systems consist of the following elements: Transponder (transponder) or RFID tag {tagL reader and antennas. RFID tags are the elements that carry information, are attached somewhere in the vehicle and provide a unique identification code. They can be active (fully powered by semi-active battery (also known as semi-passive and partially powered by battery) and passive (fed from the reader's Radio Frequency (RF) signal). The reader has the function of reading (or writing) the information the tag Antennas allow the communication of RF signals that exchange reader and tag.

Some inventions related to the Automatic Identification of Vehicles based on RFID are discussed below, making clear the differences with the system object of the present invention.

The invention patent ES-2166332-Bl, which is owned by Josep Novellas Ferrer with filing date 29-5-2000 and entitled "Procedure and device for automatic vehicle identification", refers to a procedure and device for the automatic vehicle identification by locating a passive electronic circuit with radiofrequency. It allows the identification of the vehicle through technical data of the vehicle and its owner, and may also contain any additional information.

In the system of the present invention RFID tags are used according to standards of Electronic Product Code EPCglobal, International Organization for Standardization 15018000 (-1 to -7) in collaboration with the International Electrotechnical Committee (lEC), and European Telecommunication Standardization Institute (ETSI).

The invention patent ES-2356544-Bl, which is owned by the University of Castilla La Mancha, with filing date 30-9-2009 and entitled "System of regulation and road control", is a system of regulation and RFID-based road control, which allows the integration and optimization of regulated parking systems for vehicles and traffic through restricted access areas and urban and interurban tolls. It uses a radio frequency reader, adapted to read and receive the information contained in the active RFID tags manually by an agent or in a fixed way.

In the system of the present invention, the RFID reader works in conjunction with the Inductive Loop Detector, taking advantage of the existing road infrastructure for traffic outcrops that primarily use inductive loops.

Inductive Loop Detectors, since their appearance in the 1960s, are the most commonly used sensors in vehicle traffic management systems. The main elements of an Inductive Loop Detector are: a coil of one or more turns (usually 3 to 5) embedded in the track pavement, insulated wires connecting the coil to the control booth, and electronic equipment o Protected detector inside the house.

The operation consists in that the electronic equipment generates an oscillation at a frequency between 25 kHz and 150 kHz controlled by the coil inductance. When a vehicle passes or stops on the coil, Foucault currents are induced that decrease its inductance and modify the oscillation.

Detectors can be classified into analog and digital. Analog detectors are based on measuring a voltage proportional to the phase variation of the oscillation signal. The digital detectors directly measure the frequency or period variation of the oscillation signal using timers with clock frequencies of tens of MHz. They provide measurement and recording of vehicle count, speed and length. In recent years Measurement detectors and inductive fingerprint recording have been developed, which provide speed information with a single coil, as well as classification and recognition of vehicles from the inductive waveform.

DESCRIPTION OF THE INVENTION

The invention is described below: Automatic identification of vehicles by RFID with Inductive Loop Detector.

The system object of this invention covers the following objectives:

•

It is a priority objective of this invention to provide an Automatic Vehicle Identification System (AVI) by means of Radio Frequency Identification (RFID) technology with Inductive Loop Detectors (ILD).

•

It is also a priority objective of this invention to use any of the existing RFID technologies for the different Low Frequency (LF), High Frequency (HFL Ultra High Frequency (UHF) or microwave bands, together with active, semi-passive transponders (RFID tags) ( or semi-active L or liabilities, located on any part of the vehicle.

•

It is also a priority objective of this invention to work with Analog or Digital Inductive Loop Detectors, incorporating an RFID reader that works in conjunction with the Detector without disturbing its normal operation.

•

It is also a priority objective of this invention to integrate the RFID reader into the Inductive Loop Detector thus providing, in addition to the functions of measuring density, occupation and classification of vehicles, the automatic vehicle identification function, which allows its use in applications control, supervision, security, payment, etc.

The advantages over existing RFID systems for automatic vehicle identification lie in the ease of installation, since it uses an existing infrastructure, with the economic savings that it entails and guaranteeing the safe identification of all the vehicles that circulate on the road.

Fields of application:

Control and supervision of vehicle traffic.

Payment systems for use of highways, highways, etc.

Parking management, security, etc.

The combination of these two RFID + ILD technologies provides significant savings due to the double use that would be given to ILD infrastructures already installed on the roads, without modifying the current detection equipment and incorporating electronic tags (tags) in vehicles .

DESCRIPTION OF THE FIGURES

To complete the description that is being made and in order to help a clear understanding of the characteristics of the invention, a set of figures is attached as an integral part thereof, in which, with character Illustrative and not limiting, the following is represented:

Figure 1: shows a block diagram of the invention, consisting of a coil consisting of one or more turns (1), two interconnecting conductive wires (2), a switching circuit with two positions BF and RF (3) that connects the inductive loop reader (4) or the RFID reader (5). The blocks (3), (4) and (5) constitute the integrated Detector (6).

Figure 2: shows a conventional automatic vehicle identification system, consisting of an RFID tag (8) generally located on the windshield of a vehicle (7), and an RFID reader (9) that is responsible for reading data from distance.

Figure 3: shows the automatic vehicle identification system object of the invention, consisting of an RFID tag (8) located on the bottom of a vehicle (7), a coil (10) consisting of one or more turns and the wires of connection, and a booth (11) where the integrated Detector that combines the inductive loop reader with the RFID reader is located.

PREFERRED MODE OF EMBODIMENT

For the preferred embodiment there is an RFID tag (8) located on the bottom of a vehicle (7) that incorporates a unique identification code for

5 the same. There is also a coil (1) of one or more turns (usually 3 to 5) embedded in the pavement of the track, and insulated wires (2) connecting the coil to the control booth, where we locate the Detector integrated (6), consisting of a switch (3) of two positions BF and RF that allows selecting the coil connection to the inductive loop reader (4), or to the RFID reader (5).

The system works as follows: In the normal state the coil is connected to the inductive loop reader with the switch in the BF position, the integrated detector performs a continuous analysis of the oscillation signal and the RFID reader is at rest. In case of detecting the passage of a vehicle on the coil,

15 passes the switch to the RF position that connects the coil to the RFID reader, which completes a reading process to perform vehicle identification, after which the switch returns to the initial position BF and the RFID reader at rest.

In this way the passage of each vehicle on the coil is recorded with the

20 usual parameters for counting, speed, length, etc., and also includes the identification of the vehicle with the unique identification code stored in its RFID tag.

Claims (6)

one.

Automatic Vehicle Identification by RFID with Inductive Loop Detectors.

2.

Automatic vehicle identification, according to the preceding claim, characterized in that it uses any of the existing RFID technologies for the different Low Frequency (LF), High Frequency (HF), Ultra High Frequency (UHF) or microwave bands.

3.

Automatic Vehicle Identification, according to the preceding claims, characterized in that it uses active, semi-passive (or semi-active), or passive transponders (RFID tags), located on some part of the vehicle.

Four.

Automatic Vehicle Identification, according to the preceding claims, characterized in that it works with analog or digital Inductive Loop Detectors.

5.

Automatic Vehicle Identification, according to the preceding claims, characterized in that it incorporates an RFID reader that works in conjunction with the Inductive Loop Detector without disturbing its normal operation.

6.

Automatic Vehicle Identification, according to the preceding claims, characterized in that the RFID reader is integrated in the Inductive Loop Detector thus providing, in addition to the functions of measuring density, occupation and classification of vehicles, the automatic vehicle identification function, which allows its use in control, supervision, security, payment applications, etc.

Figure 1

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