WO2011046402A2 - Integrated road information management system using two-way communications - Google Patents

Integrated road information management system using two-way communications Download PDF

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Publication number
WO2011046402A2
WO2011046402A2 PCT/KR2010/007105 KR2010007105W WO2011046402A2 WO 2011046402 A2 WO2011046402 A2 WO 2011046402A2 KR 2010007105 W KR2010007105 W KR 2010007105W WO 2011046402 A2 WO2011046402 A2 WO 2011046402A2
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WO
WIPO (PCT)
Prior art keywords
vehicle
road information
road
management system
information
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Application number
PCT/KR2010/007105
Other languages
French (fr)
Other versions
WO2011046402A3 (en
Inventor
Dongho Cho
Jin Kyu Kim
Youngmin Kim
Hyun Woo Chun
Mi Hyun Park
Sang Jo Yoo
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Korea Advanced Institute Of Science And Technology
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Application filed by Korea Advanced Institute Of Science And Technology filed Critical Korea Advanced Institute Of Science And Technology
Publication of WO2011046402A2 publication Critical patent/WO2011046402A2/en
Publication of WO2011046402A3 publication Critical patent/WO2011046402A3/en

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
    • G08G1/096775—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is a central station
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096708—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control
    • G08G1/096716—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control where the received information does not generate an automatic action on the vehicle control
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
    • G06Q50/40—Business processes related to the transportation industry
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096733—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place
    • G08G1/096758—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place where no selection takes place on the transmitted or the received information
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
    • G08G1/096783—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is a roadside individual element

Definitions

  • the present invention relates to an integrated road information management system having a function of collecting and exchanging road and vehicle information by using an infrastructure of a road and vehicle management system based on two-way communications.
  • the collection of road information is an important factor in establishing a road information management system (e.g. an intelligent traffic information system), and such road information has been independently collected and managed by a road operator and a vehicle operator.
  • a road information management system e.g. an intelligent traffic information system
  • the road operator uses an image detector to confirm a road congestion degree, and uses a loop detector, a geomagnetic sensor or a personally direct detecting method to classify kinds of passing vehicles.
  • the vehicle operator usually uses a global positioning system (GPS) to find a position of a vehicle, and uses road location recognition methods by using a radio frequency identification (RFID).
  • GPS global positioning system
  • RFID radio frequency identification
  • GPS may not work in a tunnel or an underground road and may offer rather erratic information.
  • the conventional road location recognition methods based on RFID has difficulty in finding location of a vehicle travelling on a road at a high speed due to the limitation of RFID communications method.
  • the road information management system proposed by the prior art has a disadvantage in that overlapping investments in facilities may be made because the number of information collection systems increases in proportion to the number of information necessary to operate vehicles and roads.
  • an integrated road information management system using two-way communications comprising: a vehicle master, mounted on a vehicle, for generating vehicle information including an abnormal state of the vehicle; a transceiving unit, mounted on the vehicle, for transmitting the vehicle information generated from the vehicle master; and a plurality of road information sensors, embedded in a road, for sensing road information including a humidity and a temperature of the road, each of the road information sensors having an identifier, wherein the plurality of road information sensors transmit to the transceiving unit the sensed road information.
  • Fig. 1 is a configuration diagram of an integrated road information management system using two-way communications in accordance with an embodiment of the present invention
  • Fig. 2 shows a block diagram of a road information sensor of Fig. 1;
  • Figs. 3a and 3b illustrate a transmission of partitioned road information in accordance with an embodiment of the present invention.
  • Fig. 4 illustrates a transverse position recognition of a vehicle in accordance with an embodiment of the present invention.
  • Fig. 1 is a configuration diagram of an integrated road information management system using two-way communications in accordance with an embodiment of the present invention.
  • the integrated road information management system includes a plurality of road information sensors 110, a vehicle transceiver 210, a vehicle master 220, and an upper server 300.
  • the plurality of road information sensors 110 are embedded in the center of a road 100 (e.g. a lane), and the road information sensors 110 are spaced apart from each other at predetermined intervals in accordance with a constant rule.
  • a road operator may set the rule and may regulate the burying order of the road information sensors 110 and assign unique identifiers (IDs) to the road information sensors 110.
  • IDs unique identifiers
  • each of the road information sensors 110 includes a sensor unit 130, a first transceiving unit 140, a storage unit 150, a second transceiving unit 160, and a control unit 170.
  • the sensor unit 130 can sense road information such as humidity and temperature of the surface of the road.
  • the sensor unit 130 can sense road information such as the existence/non-existence of a power cable within the road 100, the intensity of a magnetic field generated from the power cable, and the pattern of the magnetic field.
  • the first transceiving unit 140 can transmit the road information sensed by the sensor unit 140 and the unique ID of the road information sensor 110 to the vehicle 200, and can receive vehicle information from the transceiving unit 210 of the vehicle 200.
  • the first transceiving unit 140 can communicate with adjacent road information sensors in a cable or wireless communication method.
  • the storage unit 150 can store the sensed road information, the unique ID of the road information sensor 110, the vehicle information of the vehicle 200, which is received from the first transceiving unit 140, the information to be transmitted from the upper server 300, and the information received from the upper server 300, etc.
  • the second transceiving unit 160 communicates with the upper server 300 via the Internet.
  • the second transceiving unit 160 can transmit the sensed road information stored in the storage unit 150 and the vehicle information received from the vehicle 200 to the upper server 300, and can receive the road information which is managed in the upper server 300.
  • the control unit 170 can control the sensor unit 130, the first transceiving unit 140, the storage unit 150, and the second transceiving unit 160, and can determine the division of the road information, based on the communications with adjacent road information sensors.
  • the vehicle 200 will be described below with reference to Fig. 1.
  • the transceiving unit 210 is mounted on the vehicle 200 and can communicate with the road information sensors 110 by using a short range wireless communications.
  • the transceiving unit 210 can perform a two-way communications with the first transceiving unit 140 of the road information sensor 110. Therefore, the vehicle 200 can share the vehicle information with the road information sensors 110 and can also share the vehicle information with the upper server 300 due to further communication between the second transceving unit 160 and the upper server 300.
  • the vehicle master 220 is mounted on the vehicle 200.
  • the vehicle master 220 generates the vehicle information and determines the position of the vehicle 200 within the road 100.
  • the vehicle information includes a vehicle ID of the vehicle 200, a speed of the vehicle 200, and an abnormal state of the vehicle 200, etc.
  • the vehicle information further includes a power feeding/collecting efficiency of the vehicle 200, etc.
  • the unique ID of the vehicle 200 may be designated as a vehicle number; however, the invention is not limited thereto.
  • the position of the vehicle 200 within the road 100 may be divided into a longitudinal position and a transverse position.
  • the longitudinal position of the vehicle 200 may be confirmed by comparing the intensities of communication signals of the road information received through the transceiving unit 210. More specifically, the longitudinal position of the vehicle 200 on the road 100 may be determined through the unique ID of the road information sensor 110 having the road information with the greatest signal intensity among the received road information.
  • the transverse position of the vehicle 200 may be determined by comparing communication signal intensities received through a plurality of antennas installed on the vehicle 200, and a detailed description thereof will be made with reference to Fig. 4.
  • the vehicle master 220 determines the received road information and controls the vehicle 200 in accordance with the state of the road 100. For example, since the vehicle master 220 continuously receives information which can be acquired only at a limited place, such as a road sign or an electronic display board, it can display traffic conditions of an adjacent road on a navigation, or prepare a brake function on an icy road or during a rainy season, or operate a circuit breaker for the power feeding facility in order to prevent the damage of a power collection device when a power feeding facility is abnormal.
  • a limited place such as a road sign or an electronic display board
  • the upper server 300 is installed in a control center which manages the road.
  • the upper server 300 receives the road information and the vehicle information from the road information sensor 110 via the Internet, and manages the road based on the received information.
  • the upper server 300 can receive the vehicle information through the second transceiving unit 160 of the road information sensor 110.
  • the transceiving unit 210 of the vehicle 200 has a long range communication device (e.g., a wireless Internet) as well as a short range communication device, the upper server 300 can directly receive the vehicle information from the transceiving unit 210 of the vehicle 200.
  • a long range communication device e.g., a wireless Internet
  • the upper server 300 can manage the road and transmit the managed information to the road information sensors 110 and/or the transceiving unit 210 of the vehicle 200.
  • the control center located in the remote place can manage the road.
  • the upper server 300 can confirm the number of the vehicle IDs and check traffic conditions thereon.
  • the upper server 300 can confirm a traffic violation through ID tracking and determine a freezing on the surface of a road, water puddles thereon, and abnormality of power cables by determining the road information such as the temperature, humidity and magnetic field sensed by the road information sensors 110.
  • an abnormality such as the freezing of the road and water puddles exists, snow/ice removal operations may be carried out. Traffic conditions may be collectively processed by the upper server 300.
  • Figs. 3a and 3b illustrate a transmission of partitioned road information in accordance with an embodiment of the present invention.
  • the transmission/reception position may be limited by reducing a communication range.
  • the transmission/reception position may be controlled by adjusting the intervals between the road information sensors 110.
  • a single road information sensor may transmit the road information.
  • the speed of the vehicle is d [m/sec] and a communication distance is e [m]
  • a plurality of road information sensors 110A, 110B, 110C, ... , 110X, 110Y and 110Z sensing road information are grouped into sensor nodes 120 as illustrated in Fig. 3a.
  • Each of the sensor nodes 120 transmits the road information.
  • road information having a small variation within a predetermined distance is partitioned through a cable/wireless communications between the road information sensors constituting the groups (i.e. sensor nodes) and transmitted to the vehicle.
  • the vehicle receives the partitioned information and integrates it as a single data.
  • the transceiving unit 210 of the vehicle transmits to the road information sensor 110 the notification that it has not received the road information as a whole from the road information sensor 110. Since the road information sensor 110 is communicated with the adjacent road information sensors, the data partition is appointed.
  • the transceiving unit 210 of the vehicle When the transceiving unit 210 of the vehicle does not recognize the partitioned data even though the data is partitioned once and transmitted, the data is partitioned two times. When the transceiving unit 210 does not recognize the partitioned data even though the data is partitioned two times and transmitted, three-time data partition is appointed. According to such a method, the number of the road information sensors increases until the transceiving unit 210 of the vehicle receives the whole road information from the road information sensors 110. In this manner, the appointment can be made between the road information sensors so that the information partitioned by the number of the road information sensors 110 can be transmitted to the vehicle 200.
  • a portion indicated by S200 represents data provided from three road information sensors 110A, 110B and 110C implemented as one of the sensor nodes 120 in Fig. 3a.
  • three road information sensors are grouped as one of the sensor nodes 120, the invention is not limited thereto.
  • the portion S200 will be described below in more detail.
  • the road information sensors 110A, 110B and 110C include their own unique IDs and portions of road information to be transmitted.
  • the road information included in one road information sensor contains information on a size obtained by dividing the road information to be transmitted by the number of the road information sensors constituting one of the sensor nodes 120.
  • a portion indicated by S210 is data recognized by the vehicle 200.
  • the portion S210 can sequentially gather the road information received from the three road information sensors 110A, 110B and 110C and determine the gathered road information as the single road information. Also, the portion S210 can exactly determine a position where the vehicle 200 is located within the road 100 through the unique IDs of the received data.
  • the plurality of road sensors duplicately transmit the same road information to the vehicle, and the vehicle acquires the road information by gathering only the road information received from the road sensor having the highest communication signal and blocking the other information.
  • the plurality of road information sensors partition the road information and transmit the partitioned data. Then, the vehicle receives the partitioned data and integrates them into the single road information. Therefore, even though the vehicle moves at a high speed, it can stably acquire the road information and can also rearrange the road information or acquire the longitudinal position of the vehicle on the road through the unique IDs of the road information sensors included in the road information.
  • Fig. 4 illustrates a transverse position recognition of a vehicle in accordance with an embodiment of the present invention.
  • At least two antennas 230 are mounted on the vehicle 200, and the vehicle master 220 of the vehicle 200 can recognize its left/right position (i.e., its transverse position) within the road 100 through the antennas 230.
  • the transverse position recognition of the vehicle 200 on the road 100 can detect the lane departure of the vehicle and provide the road information specialized for each lane, and can also be applied to automatic steering technologies.
  • antennas 230 Although two antennas 230 are illustrated in Fig. 4, the invention is not limited thereto. A plurality of antennas may be installed on the vehicle 200. Specifically, four or five antennas 230 may be installed on the vehicle 230.
  • the transverse position recognition efficiency of the vehicle 200 can be further improved when the antennas 230 are horizontally installed in a transverse direction of the vehicle 200 as illustrated in Fig. 4.
  • the plurality of antennas 230 installed in the transverse direction of the vehicle 200 receive the same communication signal from the road information sensors 110, and the vehicle master 220 recognizes the transverse position by comparing the intensities of the communication signals received from the plurality of antennas 230.
  • the intensities of the communication signals of the road information sensors 110 must be set in a manner that they can be detected even at an interval larger than an interval between the antennas 230 installed in the vehicle 200. If not, the information transmitted from the road information sensors 110 cannot be stably received.
  • the intensities of the communication signals of the road information sensors 110 are set in a manner that they can be detected at a distance larger than a total width of the vehicle 200, the communication signals may be recognized on other lanes. Hence, it is desirable that the intensities of the communication signals be set as low as possible. To this end, the number of the antennas 230 installed in the vehicle 200 may be increased.
  • the mismatch of management information can be resolved. Also, since the exact information is acquired through two-way communications in real time, a road can be efficiently managed.
  • a road operator installs a facility for collecting road information (e.g., a road information sensor) and a vehicle operator installs a facility for vehicle information (e.g., a vehicle master, a transceiving unit, etc.).
  • a facility for collecting road information e.g., a road information sensor
  • a vehicle operator installs a facility for vehicle information (e.g., a vehicle master, a transceiving unit, etc.).

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Abstract

An integrated road information management system using two-way communications includes a vehicle master, mounted on a vehicle, for generating vehicle information including an abnormal state of the vehicle, a transceiving unit, mounted on the vehicle, for transmitting the vehicle information generated from the vehicle master, and a plurality of road information sensors, embedded in a road, for sensing road information including a humidity and a temperature of the road, each of the road information sensors having an identifier. Further, the plurality of road information sensors transmit to the transceiving unit the sensed road information.

Description

INTEGRATED ROAD INFORMATION MANAGEMENT SYSTEM USING TWO-WAY COMMUNICATIONS
The present invention relates to an integrated road information management system having a function of collecting and exchanging road and vehicle information by using an infrastructure of a road and vehicle management system based on two-way communications.
The collection of road information is an important factor in establishing a road information management system (e.g. an intelligent traffic information system), and such road information has been independently collected and managed by a road operator and a vehicle operator. For example, the road operator uses an image detector to confirm a road congestion degree, and uses a loop detector, a geomagnetic sensor or a personally direct detecting method to classify kinds of passing vehicles. The vehicle operator usually uses a global positioning system (GPS) to find a position of a vehicle, and uses road location recognition methods by using a radio frequency identification (RFID).
As is well known, however, GPS may not work in a tunnel or an underground road and may offer rather erratic information. Further, the conventional road location recognition methods based on RFID has difficulty in finding location of a vehicle travelling on a road at a high speed due to the limitation of RFID communications method.
Further, the road information management system proposed by the prior art has a disadvantage in that overlapping investments in facilities may be made because the number of information collection systems increases in proportion to the number of information necessary to operate vehicles and roads.
It is, therefore, a primary object of the present invention to provide an integrated road information management system which allows a road operator and a vehicle operator to share information by using two-way communications and integrally manages a road at a low cost in any region, regardless of a speed of a vehicle.
It is another object of the present invention to provide an integrated road information management system which prevents overlapping investments in facilities by integrally managing road information and vehicle information through two-way communications between a road information sensor and a vehicle, and acquires exact information in real time.
In accordance with the present invention, there is provided an integrated road information management system using two-way communications, comprising: a vehicle master, mounted on a vehicle, for generating vehicle information including an abnormal state of the vehicle; a transceiving unit, mounted on the vehicle, for transmitting the vehicle information generated from the vehicle master; and a plurality of road information sensors, embedded in a road, for sensing road information including a humidity and a temperature of the road, each of the road information sensors having an identifier, wherein the plurality of road information sensors transmit to the transceiving unit the sensed road information.
The above and other objects and features of the present invention will become apparent from the following description of embodiments given in conjunction with the accompanying drawings, in which:
Fig. 1 is a configuration diagram of an integrated road information management system using two-way communications in accordance with an embodiment of the present invention;
Fig. 2 shows a block diagram of a road information sensor of Fig. 1;
Figs. 3a and 3b illustrate a transmission of partitioned road information in accordance with an embodiment of the present invention; and
Fig. 4 illustrates a transverse position recognition of a vehicle in accordance with an embodiment of the present invention.
Fig. 1 is a configuration diagram of an integrated road information management system using two-way communications in accordance with an embodiment of the present invention.
Referring to Fig. 1, the integrated road information management system includes a plurality of road information sensors 110, a vehicle transceiver 210, a vehicle master 220, and an upper server 300.
For example, the plurality of road information sensors 110 are embedded in the center of a road 100 (e.g. a lane), and the road information sensors 110 are spaced apart from each other at predetermined intervals in accordance with a constant rule. In this case, a road operator may set the rule and may regulate the burying order of the road information sensors 110 and assign unique identifiers (IDs) to the road information sensors 110.
Referring to Fig. 2, each of the road information sensors 110 includes a sensor unit 130, a first transceiving unit 140, a storage unit 150, a second transceiving unit 160, and a control unit 170. The sensor unit 130 can sense road information such as humidity and temperature of the surface of the road. When the vehicle 200 is an online electric vehicle, the sensor unit 130 can sense road information such as the existence/non-existence of a power cable within the road 100, the intensity of a magnetic field generated from the power cable, and the pattern of the magnetic field. The first transceiving unit 140 can transmit the road information sensed by the sensor unit 140 and the unique ID of the road information sensor 110 to the vehicle 200, and can receive vehicle information from the transceiving unit 210 of the vehicle 200. Also, in order to partition the road information to be transmitted to the vehicle 200, the first transceiving unit 140 can communicate with adjacent road information sensors in a cable or wireless communication method. The storage unit 150 can store the sensed road information, the unique ID of the road information sensor 110, the vehicle information of the vehicle 200, which is received from the first transceiving unit 140, the information to be transmitted from the upper server 300, and the information received from the upper server 300, etc. The second transceiving unit 160 communicates with the upper server 300 via the Internet. For example, the second transceiving unit 160 can transmit the sensed road information stored in the storage unit 150 and the vehicle information received from the vehicle 200 to the upper server 300, and can receive the road information which is managed in the upper server 300. The control unit 170 can control the sensor unit 130, the first transceiving unit 140, the storage unit 150, and the second transceiving unit 160, and can determine the division of the road information, based on the communications with adjacent road information sensors.
The vehicle 200 will be described below with reference to Fig. 1. The transceiving unit 210 is mounted on the vehicle 200 and can communicate with the road information sensors 110 by using a short range wireless communications. In particular, the transceiving unit 210 can perform a two-way communications with the first transceiving unit 140 of the road information sensor 110. Therefore, the vehicle 200 can share the vehicle information with the road information sensors 110 and can also share the vehicle information with the upper server 300 due to further communication between the second transceving unit 160 and the upper server 300.
The vehicle master 220 is mounted on the vehicle 200. The vehicle master 220 generates the vehicle information and determines the position of the vehicle 200 within the road 100.
The vehicle information includes a vehicle ID of the vehicle 200, a speed of the vehicle 200, and an abnormal state of the vehicle 200, etc. When the vehicle 200 is an online electric vehicle, the vehicle information further includes a power feeding/collecting efficiency of the vehicle 200, etc. The unique ID of the vehicle 200 may be designated as a vehicle number; however, the invention is not limited thereto.
The position of the vehicle 200 within the road 100 may be divided into a longitudinal position and a transverse position. The longitudinal position of the vehicle 200 may be confirmed by comparing the intensities of communication signals of the road information received through the transceiving unit 210. More specifically, the longitudinal position of the vehicle 200 on the road 100 may be determined through the unique ID of the road information sensor 110 having the road information with the greatest signal intensity among the received road information.
The transverse position of the vehicle 200 may be determined by comparing communication signal intensities received through a plurality of antennas installed on the vehicle 200, and a detailed description thereof will be made with reference to Fig. 4.
Also, the vehicle master 220 determines the received road information and controls the vehicle 200 in accordance with the state of the road 100. For example, since the vehicle master 220 continuously receives information which can be acquired only at a limited place, such as a road sign or an electronic display board, it can display traffic conditions of an adjacent road on a navigation, or prepare a brake function on an icy road or during a rainy season, or operate a circuit breaker for the power feeding facility in order to prevent the damage of a power collection device when a power feeding facility is abnormal.
The upper server 300 is installed in a control center which manages the road. The upper server 300 receives the road information and the vehicle information from the road information sensor 110 via the Internet, and manages the road based on the received information.
In this case, the upper server 300 can receive the vehicle information through the second transceiving unit 160 of the road information sensor 110. When the transceiving unit 210 of the vehicle 200 has a long range communication device (e.g., a wireless Internet) as well as a short range communication device, the upper server 300 can directly receive the vehicle information from the transceiving unit 210 of the vehicle 200.
The upper server 300 can manage the road and transmit the managed information to the road information sensors 110 and/or the transceiving unit 210 of the vehicle 200. Hence, the control center located in the remote place can manage the road. For example, the upper server 300 can confirm the number of the vehicle IDs and check traffic conditions thereon. The upper server 300 can confirm a traffic violation through ID tracking and determine a freezing on the surface of a road, water puddles thereon, and abnormality of power cables by determining the road information such as the temperature, humidity and magnetic field sensed by the road information sensors 110. When an abnormality such as the freezing of the road and water puddles exists, snow/ice removal operations may be carried out. Traffic conditions may be collectively processed by the upper server 300.
Figs. 3a and 3b illustrate a transmission of partitioned road information in accordance with an embodiment of the present invention.
To solve a problem that may occur due to characteristics of a wireless communications used for sharing information between the vehicle and the road information sensor, that is, a problem that it is difficult to find an exact transmission/reception position of a main agent performing a wireless communication, the transmission/reception position may be limited by reducing a communication range. For instance, the transmission/reception position may be controlled by adjusting the intervals between the road information sensors 110.
Also, in accordance with the embodiment of the present invention, when the road information of the road information sensors 110 is transmitted to the vehicle 200, a single road information sensor may transmit the road information. When the speed of the vehicle is high, the short range communications have difficulty in ensuring a sufficient communication time, and thus, an amount of transmittable data is reduced such that one data as a whole cannot be transmitted to the vehicle 200 through the the single road sensor. Therefore, one data may be partitioned and transmitted through several road information sensors. For example, when data to be transmitted is a [byte] and the transmission/reception rate of the road information sensor or the transceiver of the vehicle is b [byte/sec], a time taken to complete the transmission is c(=a/b) [sec]. The speed of the vehicle is d [m/sec] and a communication distance is e [m], an allowable communication time between the vehicle and a single road information sensor is f(=e/d) [sec]. Therefore, the number of the sensors necessary for the completion of the transmission is N, i.e., c/f.
However, in order to solve an accompanying problem that an amount of transmittable data is limited because a high-speed vehicle has difficulty in ensuring a sufficient communication time, a plurality of road information sensors 110A, 110B, 110C, … , 110X, 110Y and 110Z sensing road information are grouped into sensor nodes 120 as illustrated in Fig. 3a. Each of the sensor nodes 120 transmits the road information.
Referring to Fig. 3b, road information having a small variation within a predetermined distance is partitioned through a cable/wireless communications between the road information sensors constituting the groups (i.e. sensor nodes) and transmitted to the vehicle. The vehicle receives the partitioned information and integrates it as a single data. In order to determine the number of the road information sensors constituting the single sensor node, the transceiving unit 210 of the vehicle transmits to the road information sensor 110 the notification that it has not received the road information as a whole from the road information sensor 110. Since the road information sensor 110 is communicated with the adjacent road information sensors, the data partition is appointed. When the transceiving unit 210 of the vehicle does not recognize the partitioned data even though the data is partitioned once and transmitted, the data is partitioned two times. When the transceiving unit 210 does not recognize the partitioned data even though the data is partitioned two times and transmitted, three-time data partition is appointed. According to such a method, the number of the road information sensors increases until the transceiving unit 210 of the vehicle receives the whole road information from the road information sensors 110. In this manner, the appointment can be made between the road information sensors so that the information partitioned by the number of the road information sensors 110 can be transmitted to the vehicle 200.
Specifically, a portion indicated by S200 represents data provided from three road information sensors 110A, 110B and 110C implemented as one of the sensor nodes 120 in Fig. 3a. In this embodiment, although three road information sensors are grouped as one of the sensor nodes 120, the invention is not limited thereto.
The portion S200 will be described below in more detail. The road information sensors 110A, 110B and 110C include their own unique IDs and portions of road information to be transmitted. In this case, the road information included in one road information sensor contains information on a size obtained by dividing the road information to be transmitted by the number of the road information sensors constituting one of the sensor nodes 120.
A portion indicated by S210 is data recognized by the vehicle 200. The portion S210 can sequentially gather the road information received from the three road information sensors 110A, 110B and 110C and determine the gathered road information as the single road information. Also, the portion S210 can exactly determine a position where the vehicle 200 is located within the road 100 through the unique IDs of the received data.
According to the conventional method, the plurality of road sensors duplicately transmit the same road information to the vehicle, and the vehicle acquires the road information by gathering only the road information received from the road sensor having the highest communication signal and blocking the other information. However, in accordance with the embodiment of the present invention, the plurality of road information sensors partition the road information and transmit the partitioned data. Then, the vehicle receives the partitioned data and integrates them into the single road information. Therefore, even though the vehicle moves at a high speed, it can stably acquire the road information and can also rearrange the road information or acquire the longitudinal position of the vehicle on the road through the unique IDs of the road information sensors included in the road information.
Fig. 4 illustrates a transverse position recognition of a vehicle in accordance with an embodiment of the present invention.
Referring to Fig. 4, at least two antennas 230 are mounted on the vehicle 200, and the vehicle master 220 of the vehicle 200 can recognize its left/right position (i.e., its transverse position) within the road 100 through the antennas 230.
The transverse position recognition of the vehicle 200 on the road 100 can detect the lane departure of the vehicle and provide the road information specialized for each lane, and can also be applied to automatic steering technologies.
Although two antennas 230 are illustrated in Fig. 4, the invention is not limited thereto. A plurality of antennas may be installed on the vehicle 200. Specifically, four or five antennas 230 may be installed on the vehicle 230.
Although the invention is not limited to this embodiment, the transverse position recognition efficiency of the vehicle 200 can be further improved when the antennas 230 are horizontally installed in a transverse direction of the vehicle 200 as illustrated in Fig. 4.
The plurality of antennas 230 installed in the transverse direction of the vehicle 200 receive the same communication signal from the road information sensors 110, and the vehicle master 220 recognizes the transverse position by comparing the intensities of the communication signals received from the plurality of antennas 230. At this time, the intensities of the communication signals of the road information sensors 110 must be set in a manner that they can be detected even at an interval larger than an interval between the antennas 230 installed in the vehicle 200. If not, the information transmitted from the road information sensors 110 cannot be stably received.
Furthermore, if the intensities of the communication signals of the road information sensors 110 are set in a manner that they can be detected at a distance larger than a total width of the vehicle 200, the communication signals may be recognized on other lanes. Hence, it is desirable that the intensities of the communication signals be set as low as possible. To this end, the number of the antennas 230 installed in the vehicle 200 may be increased.
In accordance with the embodiment of the present invention, since a road operator and a vehicle operator share information, the mismatch of management information can be resolved. Also, since the exact information is acquired through two-way communications in real time, a road can be efficiently managed.
Furthermore, a road operator installs a facility for collecting road information (e.g., a road information sensor) and a vehicle operator installs a facility for vehicle information (e.g., a vehicle master, a transceiving unit, etc.). Hence, the overlapping investments in facilities can be avoided.
While the invention has been shown and described with respect to some of the preferred embodiments only, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined in the following claims.

Claims (10)

  1. An integrated road information management system using two-way communications, comprising:
    a vehicle master, mounted on a vehicle, for generating vehicle information including a vehicle ID and a speed of the vehicle;
    a transceiving unit, mounted on the vehicle, for transmitting the vehicle information generated from the vehicle master; and
    a plurality of road information sensors, embedded in a road, for sensing road information including a humidity and a temperature of the road, each of the road information sensors having an unique ID,
    wherein the plurality of road information sensors transmit to the transceiving unit the sensed road information.
  2. The integrated road information management system of claim 1, wherein the plurality of road information sensors integrate the vehicle information received from the transceiving unit and the sensed road information, and transmit to an upper server the integrated information.
  3. The integrated road information management system of claim 1, wherein the road information sensor communicates with adjacent road information sensors in a cable or wireless communications method.
  4. The integrated road information management system of claim 1, wherein, when the vehicle travels at a high speed, the road information sensor partitions the road information with an adjacent road information sensor, and each of the road information sensors transmits the partitioned road information to the transceiving unit of the vehicle.
  5. The integrated road information management system of claim 1, wherein the vehicle information further includes an abnormal state of the vehicle.
  6. The integrated road information management system of claim 1, wherein, when the vehicle is an online electric vehicle, the vehicle information further includes a power feeding/collecting efficiency of the vehicle.
  7. The integrated road information management system of claim 1, wherein, when the vehicle is an online electric vehicle, the road information includes an arrangement of a power cable embedded in the road, a pattern of a magnetic field induced from the power cable, and an intensity of the magnetic field.
  8. The integrated road information management system of claim 1, wherein the vehicle master controls the vehicle based on a road condition acquired by the road information received from the transceiving unit.
  9. The integrated road information management system of claim 1, wherein the vehicle includes at least two antennas, and the vehicle master determines a transverse position thereof within a lane of the road by comparing communication intensities transmitted to the antennas.
  10. The integrated road information management system of claim 9, wherein the antennas are horizontally installed in a transverse direction within the vehicle.
PCT/KR2010/007105 2009-10-16 2010-10-15 Integrated road information management system using two-way communications WO2011046402A2 (en)

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KR10-2009-0098842 2009-10-16
KR1020090098842A KR101081426B1 (en) 2009-10-16 2009-10-16 Uses a both direction communication information integrated management system

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