KR20100091085A - A method of collecting traffic information by the segment unit of roads and the vehicle terminal thereof - Google Patents

Abstract

PURPOSE: A traffic information collection method, a vehicle terminal thereof, and a traffic information system thereof are provided to multiply transmit traffic information by generating the traffic information of a road according to a segment unit. CONSTITUTION: A traffic information system comprises a center device, a base station, and a vehicle terminal. The base station is connected to the center device and a network. The vehicle terminal wirelessly communicates with the base station. The vehicle terminal stores segment travel information. The vehicle terminal transmits the segment travel information through the base station to the center device. The center device generates the communications information of a segment unit. The center device multiply transmits the communications information through the base station to the vehicle terminal.

Description

A method of collecting traffic information by vehicle segment and its vehicle terminal information by segment unit {A method of collecting traffic information by the segment unit of roads and the vehicle terminal}

The present invention relates to a vehicle driving information collection method of a vehicle terminal mounted on a vehicle in a traffic information system including a center apparatus, a base station, and a vehicle terminal.

In particular, the present invention collects the driving information of the vehicle by segment by dividing the link section of the map information into segments, and collects the driving information of the vehicle terminal for generating multi-transmission by generating traffic information of the road by the segment unit. And a vehicle terminal and a traffic information system.

In general, a traffic information system is an urban area traffic information system that collects, processes, and distributes traffic information from street segments in a city. As the driver's demand for traffic information increases, the provision of traffic information is important in terms of traffic demand management as well as efficient management and operation of transportation means and transportation systems such as efficient operation of traffic facilities and distribution of traffic demand.

The traffic information service induces the driver to drive safely by providing the driver with traffic information or traffic knowledge in advance. That is, the traffic information service provides the driver with information such as road congestion, construction, accident and control so that the detour road can be selected according to traffic conditions. Through this, the traffic information service can minimize the direct and indirect loss cost by improving traffic communication according to the effect of dispersing traffic volume, reducing travel time by selecting the optimal route, and preventing accidents based on prior knowledge of risk situations such as accidents.

However, currently provided traffic information is collected through detectors, CCTVs, etc. installed in some restricted areas, and is provided after some time through analysis and input procedures, and thus cannot meet the traffic information needs of all citizens. There was an inadequate use in managing accidents such as traffic safety management, disasters and disasters.

In order to solve the above problems, a traffic information system for providing traffic information on a road in real time has been proposed. The traffic information system is composed of a vehicle terminal, a base station, and a center apparatus. The vehicle terminal and the base station are wirelessly connected so that the vehicle terminal mounted on the vehicle can communicate with the base station even when the vehicle terminal moves at a high speed.

On the other hand, the conventional traffic information has only the traffic information for the link section between the node of the map information. Or, if the link section is too long, the link is further subdivided to construct map information. Therefore, the length of the link section is not too long, and traffic information is generated in the link section.

However, when the link section is further subdivided in the map information as described above, the map information becomes much larger. When the amount of map information increases, all traffic information or map information is difficult to transmit with limited wireless bandwidth between the vehicle terminal and the base station.

Therefore, the map information used for the traffic information should be considerably reduced in size compared to the map information (map) used in the map information system (GIS). In order to reduce the size, only the information about the nodes such as intersections and the link between them should be stored in the map information, and the information between the links should be reduced as much as possible.

As described above, detailed road information of the link section is not stored in the map information, and thus traffic information also generates only one piece of communication information. However, when the link section is long or long, the link section may be further divided to provide communication information.

In conclusion, there is a need for a method that can collect and provide more detailed communication information while using a small amount of map information.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems described above, and to provide a vehicle driving information collection method of a vehicle terminal mounted on a vehicle in a traffic information system including a center apparatus, a base station, and a vehicle terminal.

In addition, an object of the present invention is to segment the link section of the map information into segments to collect the driving information of the vehicle for each segment unit, and collect the traffic information of the road by segment unit unit vehicle driving information of the vehicle terminal for multi-transmission To provide a collection method, a vehicle terminal and a traffic information system.

In order to achieve the above object, the present invention relates to a traffic information system, comprising a center apparatus, a base station connected to the center apparatus and a network, and a vehicle terminal for wireless communication with the base station. Obtaining and storing segment driving information including the segment length and the passing time in the link section at intervals of time or length of the segment, and transmitting the stored segment driving information to the center apparatus through the base station, and the center apparatus from the vehicle terminal. The segment information is generated using the collected segment driving information, and the generated traffic information is multi-transmitted through the base station to the vehicle terminal.

In another aspect, the present invention provides a traffic information system, wherein the vehicle terminal comprises: a map information storage unit for storing map information including node and link information; A GPS receiver for receiving GPS reception information including a location and a speed of the vehicle; A node matching determination unit determining whether the vehicle departs or arrives at the node; When the vehicle leaves the first node, the segment driving information including the segment length and the passing time is obtained and stored at intervals of time or length in segments, and when the vehicle arrives at the second node, the segment from the previous segment to the second node. A driving information collection unit for obtaining and storing driving information; A driving information transmitter which transmits the stored segment driving information to the base station when the base station is connected to the base station; A communication information receiving unit for receiving the communication information in units of segments from the center apparatus through a base station; It characterized in that it comprises a communication information display unit for displaying the communication information on the display in units of segments.

The present invention also relates to a vehicle driving information collection method of a vehicle terminal mounted on a vehicle in a traffic information system including a center apparatus, a base station and a vehicle terminal, wherein the vehicle terminal includes map information including node and link information. Storing GPS data and receiving GPS received information including a location and a speed of the vehicle from the GPS, the method comprising: (a) determining whether the vehicle leaves the first node of the map information; (b) obtaining and storing segment driving information including a segment length and a passing time at intervals of time or length in units of segments when the vehicle starts from the first node; (c) determining whether the vehicle arrives at the second node of the map information; (d) when the vehicle arrives at the second node, obtaining and storing segment driving information from the immediately preceding segment to the second node; (e) accessing the base station, and transmitting the stored segment driving information to the base station.

In addition, in the method of collecting vehicle driving information of a vehicle terminal, in the step (a), if the position of the vehicle enters after entering the first node, it is determined that the vehicle starts the first node, and ( In step c), if the position of the vehicle enters the second node after entering the second node, it is determined that the vehicle arrives at the second node, or in step (a), the position of the vehicle is determined to be the previous node. When entering the first node after entering, it is determined that the vehicle departs from the first node. In step (c), when the location of the vehicle enters the second node after entering the first node, the vehicle enters the second node. It is characterized by judging to arrive.

In addition, the present invention is a method for collecting vehicle driving information of a vehicle terminal, wherein the horizontal axis difference between the vehicle position and the node position is larger than the value of the first snap of the node, or the longitudinal axis difference between the vehicle position and the node position is the second node of the node. If it is greater than the value of the snap, it is determined that the node is advancing, and the horizontal axis difference between the vehicle position and the node position is smaller than the value of the first snap of the node, and the longitudinal axis difference between the vehicle position and the node position is greater than the value of the second snap of the node. If it is small, it is determined to enter the node.

According to the present invention, in the vehicle driving information collection method of the vehicle terminal, when the value of the second snap is not determined, both the horizontal axis difference and the vertical axis difference are compared with the value of the first snap.

In addition, in the vehicle driving information collection method of the vehicle terminal, in the step (b), the average speed of the segment section, the standard deviation of the GPS speed, the coordinates of the location of the creation point of the segment driving information are further included in the segment driving information. It is characterized by storing.

In addition, the present invention in the vehicle driving information collection method of the vehicle terminal, the average speed of the segment section is calculated as the speed divided by the running time by the GPS reception information accumulated distance by the GPS reception information, or at the point of the segment section Characterized in that the average vehicle speed by the GPS receiving information.

In addition, the present invention is characterized in that in the vehicle driving information collection method of the vehicle terminal, when the average speed of the segment section is obtained by averaging the vehicle speed at the point, the point speed is corrected according to [Equation 4].

[Equation 4]

In addition, the present invention relates to a vehicle terminal mounted on a vehicle in a traffic information system including a center apparatus, a base station, and a vehicle terminal, including a control device for collecting vehicle driving information and displaying traffic information of a road, The control device includes a map information storage unit for storing map information including node and link information; A GPS receiver for receiving GPS reception information including a location and a speed of the vehicle; A node matching determination unit determining whether the vehicle departs or arrives at the node; When the vehicle leaves the first node, the segment driving information including the segment length and the passing time is obtained and stored at intervals of time or length in segments, and when the vehicle arrives at the second node, the segment from the previous segment to the second node. A driving information collection unit for obtaining and storing driving information; When the access to the base station, characterized in that it comprises a driving information transmission unit for transmitting the stored segment driving information to the base station.

In another aspect, the present invention provides a vehicle terminal of a traffic information system, the control device comprising: a traffic information receiving unit for receiving the communication information in units of segments from the center apparatus through a base station; The apparatus may further include a communication information display unit configured to display the communication information on a display in units of segments.

Further, in the vehicle terminal of the traffic information system, the node matching determination unit determines that the vehicle leaves the first node when the vehicle enters the first node and enters the first node, and the position of the vehicle is determined to be the first. When entering the second node after entering the second node, it is determined that the vehicle arrives at the second node, or when the location of the vehicle enters the first node after entering the previous node, it is determined that the vehicle leaves the first node. If the location of the vehicle enters the first node after entering the first node, it is determined that the vehicle arrives at the second node.

In addition, in the vehicle terminal of the traffic information system, the node matching determination unit may be configured such that the horizontal axis difference between the vehicle position and the node position is greater than the value of the first snap of the node, or the vertical axis difference between the vehicle position and the node position is different. If it is greater than the value of the second snap of the node, it is determined that the node is advancing, and the horizontal axis difference between the vehicle position and the node position is smaller than the value of the first snap of the node, and the longitudinal axis difference between the vehicle position and the node position is the second node of the node. If it is smaller than the value of the snap, it is determined that the node enters.

Further, in the vehicle terminal of the traffic information system, the node matching determination unit compares both the horizontal axis difference and the vertical axis difference with the value of the first snap when the value of the second snap is not determined. do.

As described above, according to the vehicle driving information collection method for each segment of the vehicle terminal according to the present invention, the effect that can provide more accurate traffic information by segmenting and providing the road traffic information within the link section.

In addition, according to the vehicle driving information collection method of the vehicle terminal, and the vehicle terminal and the traffic information system, by accurately determining whether the vehicle leaves or arrives at the node of the map information, the segment unit is measured at a predetermined distance interval after entering the node, Even if they do not have the map information, the effect of measuring the more accurate segment and obtaining the communication information by the segment unit is obtained.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings.

In addition, in describing this invention, the same code | symbol is attached | subjected and the repeated description is abbreviate | omitted.

First, the overall configuration of a traffic information system according to the present invention will be described with reference to FIG.

As shown in FIG. 1, the traffic information system is largely composed of a center apparatus 100, a base station 200, and a vehicle terminal 300.

The center apparatus 100 receives and collects driving information such as the position and speed of the vehicle and situation information through real time communication between the vehicle terminal 300 or the base station 200, analyzes the collected driving information of each vehicle, Create communication information. The center apparatus 100 transmits the generated communication information to the base station 200 or the vehicle terminal 300. In addition to the estimated passing time of the road, the communication information includes sudden situation information and weather information.

The base station 200 is installed at intersections, roadsides, CCTV holdings and related facilities, and is a device for transmitting and receiving data with the vehicle terminal 300 and the center apparatus 100. The base station 200 provides a wireless communication network 20 for connecting the vehicle 10 to the Internet. The base station 200 collects the driving information accumulated from the vehicle terminal 300 to be connected, and transmits the collected driving information to the center apparatus 100. On the other hand, the base station 200 is equipped with a field device, such as CCTV and transmits the information (for example, CCTV image, etc.) collected from the field device to the center device 100 together.

The base station 200 is connected to the center apparatus 100 and the Internet 50. The communication network between them may use a high-capacity high-speed communication using an optical communication-based Internet protocol. In addition, in the wired section between the center apparatus 100 and the base station 200, alternatives other than optical communication may be used according to the design policy of the customer.

The vehicle terminal (On Board Equipment) 300 is installed in the vehicle 10 to perform wireless LAN communication. The vehicle terminal 300 may transmit and receive necessary information by connecting to the Internet through a wireless LAN.

Meanwhile, the vehicle terminal 300 periodically obtains position and speed information from the GPS 60, accumulates driving information according to the moving path of the vehicle 10, and accumulates driving information when the connection is made to the base station 200. Transmits to the base station 200. In addition, the vehicle terminal 300 receives information such as communication information and nearby CCTV screens transmitted from the connected base station 200.

The vehicle terminal 300 communicates with the base station or the base station 200 by using a wireless communication technology based on IEEE 802.11a / e. In particular, since the vehicle 10 mounted with the vehicle terminal 300 travels at a high speed, wireless communication between the vehicle terminal 300 and the base station 200 is performed in a mobile environment. Therefore, the vehicle terminal 300 needs to quickly connect with the base station 200 to transmit and receive necessary information.

In other words, in the traffic information system, the vehicle terminal 300 installed in the vehicle 10 collects driving information of the vehicle and transmits the driving information to the center apparatus 100 through the base station 200 through the wireless LAN system. When the center apparatus 100 collects the driving information of each vehicle 10 to generate communication information and transmits the information to each base station 200, the vehicle terminal 300 receives the entire traffic information through the base station 200. Through this, traffic information is collected and distributed in real time from each vehicle 10.

Next, the vehicle terminal 300 according to an embodiment of the present invention will be described in more detail with reference to FIG. 2.

As shown in FIG. 2, the vehicle terminal 300 includes a wireless interface 310, a built-in GPS 320, a controller 330, a memory 340, an integrated connector 360, a switch 370, and a power source 380. It is configured to include. In addition, the speaker 351 may further include a display 352.

The radio interface 310 is for communicating with the base station 200 and is based on the IEEE 802.11a / e standard. The integrated connector 360 is an integrated port for connecting with other terminal devices, and supports IEEE802.3 10 / 100Base-T / TX, USB1.1 or higher, RS-232 communication, and the like. There must be at least two external input ports (GPI) for the input of 5V control signals.

Built-in GPS 320 is a device that receives a signal from the GPS. The vehicle terminal 300 obtains data such as a driving position or a traveling speed of the vehicle through the built-in GPS 320.

The control device 330 is a main processor for controlling the entire vehicle terminal device. The memory 340 stores necessary data. In particular, the memory 340 stores data that the vehicle collects while driving. In addition, the firmware is stored in the memory 340, and the control device 330 can read and execute the firmware from the memory 340.

The display 352 has a configuration that can effectively express traffic information and facilitate the transmission of the information. Preferably, the screen resolution is 640x480 pixels or more, and should be able to reduce and display an image larger than the screen.

For example, as shown in FIG. 3, the display 352 may display a real-time traffic information graphic of the entire road network using the traffic information received from the vehicle terminal 300.

Preferably, the display 352 may guide the city highway and the main trunk axis information by using the communication information received from the vehicle terminal 300, and may display a real-time traffic information graphic of a specific road line.

Preferably, the display 352 may have different display criteria according to the speed. For example, as shown below, the display default value for each speed is differently set as shown in [Table 1], and the display standard default value for each color is differently set as shown in [Table 2].

TABLE 1

Hierarchy classification Speed limit Traffic delays Slow traffic

Urban highways: 80km / h 50km / h or more 50-30km / h or less than 30km / h

Expressway: 100 to 110 km / h 70 km / h or more 70 to 30 km / h or less than 30 km / h

City roads: 60 km / h 20 km / h or more 10 to 20 km / h less than 10 km / h

TABLE 2

Status Classification Red Green Blue

Communication: Abstract 180 220 80

Slow line: Yellow 250 220 25

Identity: Red 250 70 70

No data: gray 190 190 190

The switch 370 includes a reset, start button, and the like.

Next, the components of the map information used in accordance with the present invention will be described with reference to FIG.

As shown in FIG. 4, the map information is composed of nodes, links, and vertices. Node means the intersection where roads intersect. In FIG. 4, circles referring to N1, N2, ..., N6 are referred to. Nodes are marked and identified by their longitude and latitude.

A link is a road, or line, that connects a node. In FIG. 4, the lines referring to L12, L13, ..., L56 and the like are referred to. The link is directional. For example, a link connecting nodes N1 and N2 may include L12, which is a connection road from N1 to N2, and L21, which is a connection road from N2 to N1. If the link is a road that runs in only one direction, the link may be one. It can be seen that there are only roads that can operate only from N3 to N5 between the nodes N3 and N5, and the roads are different from each other according to the driving direction between the nodes N5 and N6. Links are marked and identified by the start and destination nodes of the segment.

The intermediate position in the link section is called a vertex. For example, the link L12 has vertices V121 and V122, and the link L12 has vertices V131 and V132. By retaining the vertex information in the diffuse reflection area of the downtown section, where the link is difficult to assume a straight section, more accurate map information can be obtained. Vertices are managed as a list of attributes of the link.

In general, the map information (map) used in the GIS (map information system) is quite large, the vertex information occupies a considerable number. In order for the map information to be displayed in more detail, it is necessary to break the link into pieces and have the position coordinates of each section.

However, the map information used for traffic information is for displaying traffic information such as congestion of road sections, and not for detailed road guidance. Therefore, it is not necessary to have all the vertex information to indicate the location of the road in detail. Accordingly, in the traffic information system according to the present invention, the map information DB is reduced and managed in a low capacity for automatic updating of the node-link information DB while driving. In this process, we minimized the vertex information, which is the biggest cause of the DB capacity burden, and assumes that link information can be created on many roads without the vertex information.

Next, the vehicle driving information collection method of the vehicle terminal 300 according to an embodiment of the present invention will be described in more detail with reference to FIGS. 5 and 6.

As shown in FIG. 5, the vehicle driving information collection method of the vehicle terminal 300 includes: (a) determining whether the vehicle starts the first node of the map information (S310); (b) when the vehicle starts from the first node, obtaining and storing segment driving information including a segment length and a passing time at intervals of time or length in units of segments (S320); (c) determining whether the vehicle arrives at the second node of the map information (S330); (d) when the vehicle arrives at the second node, obtaining and storing segment driving information from the immediately preceding segment to the second node (S340); (e) When accessing the base station, it is divided into the step of transmitting the stored segment driving information to the base station (S350).

The driving information refers to main items created by using GPS information in the vehicle terminal 300, for example, section speed and passing time. In Fig. 4, if the vehicle travels through nodes N0, N1, N3, N5, N4, N7, driving information on links L01, L13, L35, L54, and L47 will be created. The driving information of the link basically includes the section length and the passing time. Knowing the section length and passing time, the section speed can be obtained.

The vehicle terminal 300 creates segment information in the middle of a link as driving information. Segment information enables the provision of information by segment rather than link unit when providing information such as urban highways and highways having a relatively long link length.

First, it is determined whether the vehicle departs from the first node of the map information (S310), and when the vehicle departs, the segment length and the travel time are collected and stored at intervals of the segment (S320).

For example, as shown in FIG. 6, while the vehicle starts from the first node (or start node) N1 and heads toward the second node (or end node) N2, the information is divided into segments S1, S2, and the like. Collect it.

The criterion for dividing the link into segments is based on a segment time unit (Δt) or a segment distance unit (ΔL).

For example, when the vehicle terminal 300 travels the distance ΔL after starting the first node, the vehicle terminal 300 views the starting point V0 to the point V1 that traveled the ΔL as the first segment S1, such as the segment road and travel time of the segment. Obtain and store segment driving information. Further, when driving DELTA L, which is a segment distance unit again, from the driving point V1, the segment driving information for the next second segment S2 is obtained and stored. In this way, the segment travel information is created by dividing the link for each segment distance unit ΔL. In FIG. 6, the segments obtained by the segment distance unit ΔL as described above are S1, S2, and S3.

In the embodiment of FIG. 6, the segment unit is a distance unit ΔL, but may also be a unit of time. That is, after starting the first node, the segment driving information may be obtained and stored by dividing the segment into segments every predetermined time Δt.

Next, it is determined whether the vehicle arrives at the second node of the map information (S330), and when it arrives, the segment driving information from the previous segment to the second node is obtained and stored (S340).

If the vehicle arrives at the second node (or end node) N2 before filling the segment unit while driving, the segment up to the second node is defined as the last segment, and the segment driving information is obtained and stored. In FIG. 6, the point V3 is the last position of the previous segment and the vehicle arrives at the second node N2 to collect and store driving information for the last segment S4.

Segments S1, S2, S3 in FIG. 6 are divided by the segment distance unit ΔL and thus have the same distance. However, since the last segment S4 is the distance from the previous segment S3 to the point beyond the node N2, the segment length of the segment S4 is ΔL ', which may be different from the segment distance unit ΔL.

Next, a method of determining whether a vehicle leaves or arrives at a node of map information according to an embodiment of the present invention will be described in more detail with reference to FIG. 7.

Map information (map), such as a general navigation system (or map information system), has detailed location coordinates (location coordinates of vertices) within all map locations, that is, nodes and nodes (or link sections). Therefore, even within the link, the position coordinates of the vertices can correct (match) the difference from the GPS coordinates. However, in the map information according to the present invention, since the vertex is largely omitted, it is difficult to match the position of the map information and the GPS coordinates in the link section.

Therefore, according to the present invention, node matching for determining whether a vehicle has departed or arrived at a node of map information is very important. This is because a significant error may occur if it is misjudged.

As shown in FIG. 7A, node matching in a general navigation system compares the position coordinate of node N1 on the map information with the position coordinate M1 of the vehicle, and if the distance difference is within a certain distance (or radius of B1), the vehicle is a node on the map. It is determined to be located at N1. At this time, B1 is called snap. The snap also takes into account the positional error of the vehicle by GPS. That is, even if the vehicle location is not determined by the GPS error, if the vehicle is within a certain snap range, it is determined that the vehicle is in the node.

The point of exiting the node is the point outside the snap boundary, and the point of entry into the node is the point of entry into the snap range.

In general, the radius of the snap is often determined at a constant distance. However, as shown in FIG. 7B, when the difference in the road width between the transverse road and the longitudinal road is severe, a problem occurs when the snap is set to B1 or B2. That is, if the snap is set to B1, the vehicle M1 will determine that the node on the map has not entered even though the intersection has already entered the intersection (node). In addition, if the snap is set to B2, the vehicle M2 will be determined to have entered the node on the map even though it has not already entered the intersection (node).

Therefore, the snap according to the present invention is determined by comparing the distance between the horizontal axis or the vertical axis by defining two snaps. That is, as shown in Fig. 7C, the snap region B3 is composed of a first snap comparing the difference in the horizontal axis and a second snap comparing the difference in the longitudinal axis. By the configuration of the snap as described above, the snap region becomes a rectangular shape as shown in Fig. 7C.

On the other hand, it is preferable that the reference point for determining whether the vehicle departs or arrives to the node is based on the point of exiting the node (or intersection).

For example, in FIG. 6, points V0 and V4 are meant. That is, if the position of the vehicle enters after entering the first node, it is determined that the vehicle departs from the first node, and if the vehicle enters the second node after entering the second node, the vehicle enters the second node. Judging by the arrival.

At this time, the determination using snap is as follows.

If the horizontal axis difference between the vehicle position and the node position is greater than the value of the first snap of the node or the longitudinal axis difference between the vehicle position and the node position is greater than the value of the second snap of the node, it is determined that the node advances. Further, if the horizontal axis difference between the vehicle position and the node position is smaller than the value of the first snap of the node and the longitudinal axis difference between the vehicle position and the node position is smaller than the value of the second snap of the node, it is determined that the node is entered.

In another embodiment, the reference point may be based on a point at which the vehicle enters. That is, if the location of the vehicle enters the first node after entering the previous node, it is determined that the vehicle leaves the first node. In step (c), the second node is determined after the location of the vehicle enters the first node. Upon entering, it is determined that the vehicle arrives at the second node.

The method of collecting segment driving information of FIG. 6 is as follows. Segment information is created for each elapsed time of? T or a distance elapsed of? L using the point of entry of the node as a reference point (or a segment-based information creation reference point). That is, the information creation in the link unit and the information creation in the segment unit are both made based on the point away from the node.

On the other hand, when the value of the second snap is not determined, both the horizontal axis difference and the vertical axis difference are compared with the value of the first snap. In this case, therefore, the snap region is in the form of a square.

Next, a method of obtaining vehicle driving information of a vehicle terminal according to an embodiment of the present invention will be described in more detail.

There are two methods for calculating the link traveling speed: (1) the method based on the link length of the map information, and (2) the method based on the GPS coordinates. The former is expressed by Equation 1, and the latter is expressed by Equation 2.

[Equation 1]

[Equation 2]

The link length of the map information means the length of the road given by the map information, and the length of the road by GPS coordinates means the accumulated distance measured by the actual vehicle. Here, preferably, the GPS reference passing time is all based on a time point leaving the node.

There are two methods for calculating the running speed for each segment unit: (1) the method based on the average speed and (2) the method based on the point speed. The former is expressed by the equation [Equation 3], and the latter is expressed by the equation [Equation 4].

&Quot; (3) "

&Quot; (4) "

That is, the average speed of the segment section is calculated as the speed obtained by dividing the cumulative distance by the GPS reception information by the travel time by the GPS reception information, or the average speed of the vehicle by the GPS reception information at the point of the segment section. .

If the average vehicle speed at the point is obtained to obtain the average section speed of the segment, correction should be made. Use the following calibration method. However, only GPS output speed below 0.8m / s is corrected.

By the segment information collection method as described above, the segment section information in the link processes the information based on distance, time and speed, thereby relieving the transmission burden generated by collecting the coordinate information directly, and collecting the raw data collected in the form of coordinates. The effect of avoiding the burden of processing by the center apparatus and generating data capable of providing information for each segment within individual links is obtained.

Next, the configuration of the driving information collected by the vehicle terminal according to an embodiment of the present invention will be described with reference to FIG. 8.

 As shown in Fig. 8A, the driving information list is composed of respective driving information records, and the driving information record is composed of BOR, entity ID, link / node information, and a plurality of segment driving information.

Begin Of Record (BOR) indicates whether the current driving information record is the last, the number of segment information, and whether the link matching (matching the start node and the end node of the link) is completed.

The entity ID is the link ID if the link matching is completed, otherwise the node ID is entered. Link ID is entered when the node arrives from the start node and arrives at the end node.

As shown in FIG. 8B, the link / node information is information about a link or a node input to the entity ID. That is, information about the time of departure from the node, the total pass time (total pass time for the completed link, the total pass time to the last segment if not completed), and the average speed are input.

The segment driving information is as shown in FIG. 8C. That is, information on the segment section length, section travel time, section average speed, GPS speed standard deviation, and location of the segment preparation point is input.

Next, a method of obtaining segmental communication information and its configuration according to an embodiment of the present invention will be described with reference to FIG. 9. Segmented communication information is communication information provided in units of segments. That is, information about the time to pass in units of segments.

The center apparatus 100 collects all driving information collected by the vehicle terminal 300 through the base station 200. The center apparatus 100 obtains traffic information of the road using the collected driving information.

For example, driving information for the same link may be received from various vehicle terminals 300. Statistical methods such as averaging these driving information can be used to obtain the estimated passage time on the link. In particular, since the driving information collected by the vehicle terminal 300 is obtained in segments, the estimated passage time may also be obtained in segments.

The estimated transit time obtained by the above method is composed of the communication information for each segment and is multi-transmitted to the vehicle terminal 300 again. When the center apparatus 100 distributes the obtained segmental communication information to the base station 200, the base station 200 multi-transmits the received segmental communication information in the communication area.

As shown in FIG. 9, the segmental communication information includes a Begin of Record (BOR), a link ID, and a list of estimated passage times of each segment.

The Begin Of record (BOR) field is the beginning of the record and contains the record attributes, and the End Of record (EOR) field marks the end of the record. The BOR indicates whether the record persists and the number of pairs of estimated pass times.

A segment consists of a pair of distance and time. The distance is the length of the segment in meters (m), and the time in seconds is the time it passes through the segment. The segment list contains as many segments as the number of segments in the link.

Next, a configuration of a control device of a vehicle terminal for collecting vehicle driving information and displaying road traffic information according to an embodiment of the present invention will be described with reference to FIG. 10.

As shown in FIG. 10, the control device 330 of the vehicle terminal includes a map information storage unit 331, a GPS receiver 332, a node matching determination unit 333, a driving information collection unit 334, and a driving information transmission unit. 335. In addition, the communication information receiving unit 336 and the communication information display unit 337 may be further included.

The map information storage unit 331 stores map information including node and link information.

The GPS receiver 332 receives GPS reception information including the position and speed of the vehicle.

The node matching determination unit 333 determines whether the vehicle leaves or arrives at the node.

In particular, the node matching determination unit 333 determines that the vehicle departs from the first node when the position of the vehicle enters the first node, and determines the second node after the position of the vehicle enters the second node. The vehicle determines that the vehicle arrives at the second node, or when the location of the vehicle enters the first node after entering the previous node, the vehicle determines that the vehicle leaves the first node, and the position of the vehicle enters the first node. After entering the second node, it is determined that the vehicle arrives at the second node.

Further, the node matching determination unit 333 may determine that the difference in the horizontal axis between the vehicle position and the node position is greater than the value of the first snap of the node, or the difference in the longitudinal axis between the vehicle position and the node position is greater than the value of the second snap of the node. Determine that the node is advancing, and enter the node if the horizontal axis difference between the vehicle position and the node position is less than the value of the first snap of the node and the longitudinal axis difference between the vehicle position and the node position is less than the value of the second snap of the node. I judge it.

When the value of the second snap is not determined, the node matching determination unit 333 compares both the horizontal axis difference and the vertical axis difference with the value of the first snap.

When the vehicle leaves the first node, the driving information collection unit 334 obtains and stores segment driving information including the segment length and the passing time at intervals of time or length in segments, and immediately after the vehicle arrives at the second node. The segment driving information from the segment to the second node is obtained and stored.

When the driving information transmitter 335 accesses the base station 200, the driving information transmitter 335 transmits the stored segment driving information to the base station.

The communication information receiving unit 336 receives the communication information in units of segments from the center apparatus 100 through the base station 200.

The communication information display unit 337 displays the communication information on the display 352 in units of segments. An example of displaying a link section between nodes by segment unit is as shown in FIG. 3.

For the insufficient description of the configuration of the control device of the vehicle terminal, refer to the description of the vehicle driving information collection method of the vehicle terminal described above.

As mentioned above, although the invention made by this inventor was demonstrated concretely according to the said Example, this invention is not limited to the said Example, Of course, a various change is possible in the range which does not deviate from the summary.

The present invention can be applied to the development of a vehicle terminal installed in the vehicle to collect driving information of the vehicle. In particular, it can be applied to the development of a vehicle terminal that collects the driving information in detail by dividing the link interval between the nodes in segments.

1 is a diagram showing the overall configuration of a traffic information system for implementing the present invention.

2 is a block diagram of a configuration of a vehicle terminal according to an embodiment of the present invention.

3 is a diagram illustrating the traffic information of the road displayed on the display of the vehicle terminal according to an embodiment of the present invention.

4 is a diagram illustrating the components of the map information used in accordance with the present invention.

5 is a flowchart illustrating a vehicle driving information collection method of a vehicle terminal according to an embodiment of the present invention.

6 is a diagram illustrating an example of collecting driving information by dividing a link section by a segment according to an embodiment of the present invention.

7 is a diagram illustrating a method of determining whether a vehicle leaves or arrives at a node of map information according to an embodiment of the present invention.

8 is a diagram illustrating a configuration of driving information collected by a vehicle terminal according to an embodiment of the present invention.

9 is a diagram illustrating a configuration of segmental communication information according to an embodiment of the present invention.

10 is a block diagram illustrating a configuration of a control device of a vehicle terminal for collecting vehicle driving information and displaying road traffic information according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: vehicle 20: wireless communication network (communication area of the base station)

50: Internet 60: GPS

120: authentication server 200: base station

300: vehicle terminal 310: wireless interface

311: antenna 320: built-in GPS

330 control unit 340 memory

351: speaker 352: display

360: Integrated connector 370: Switch

380: power

Claims (14)

A center device, a base station connected to the network by the center device, a vehicle terminal for wireless communication with the base station, The vehicle terminal obtains and stores segment driving information including a section length and a passing time at a time interval or a segment interval in a link section of map information, and transmits the stored segment driving information to a center device through the base station. The center apparatus generates traffic information in units of segments by using segment driving information collected from the vehicle terminal, and multi-transmits the generated traffic information to the vehicle terminal through a base station. The method of claim 1, The vehicle terminal, A map information storage unit for storing map information including node and link information; A GPS receiver for receiving GPS reception information including a location and a speed of the vehicle; A node matching determination unit determining whether the vehicle departs or arrives at the node; When the vehicle leaves the first node, the segment driving information including the segment length and the passing time is obtained and stored at intervals of time or length in segments, and when the vehicle arrives at the second node, the segment from the previous segment to the second node. A driving information collection unit for obtaining and storing driving information; A driving information transmitter which transmits the stored segment driving information to the base station when the base station is connected to the base station; A communication information receiving unit for receiving communication information in units of segments from the center apparatus through a base station; Traffic information display unit for displaying the traffic information on the display in units of segments. In a traffic information system including a center apparatus, a base station, and a vehicle terminal, a vehicle driving information collection method of a vehicle terminal mounted on a vehicle, The vehicle terminal stores map information including node and link information, and receives GPS reception information including the position and speed of the vehicle from the GPS. The method, (a) determining whether the vehicle leaves the first node of the map information; (b) obtaining and storing segment driving information including a segment length and a passing time at intervals of time or length in units of segments when the vehicle starts from the first node; (c) determining whether the vehicle arrives at the second node of the map information; (d) when the vehicle arrives at the second node, obtaining and storing segment driving information from the immediately preceding segment to the second node; and (e) transmitting the stored segment driving information to the base station when the base station is connected to the base station. The method of claim 3, wherein In step (a), if the position of the vehicle enters after entering the first node, it is determined that the vehicle leaves the first node, and in step (c), after the position of the vehicle enters the second node After entering the second node, the vehicle determines that the second node arrives, or, In step (a), if the location of the vehicle enters the first node after entering the previous node, it is determined that the vehicle leaves the first node. In step (c), the location of the vehicle enters the first node. And after entering the second node, determine that the vehicle arrives at the second node. The method of claim 4, wherein If the horizontal axis difference between the vehicle position and the node position is greater than the value of the first snap of the node or the longitudinal axis difference between the vehicle position and the node position is greater than the value of the second snap of the node, it is determined that the node is advancing, And when the horizontal axis difference between the vehicle position and the node position is smaller than the value of the first snap of the node, and the vertical axis difference between the vehicle position and the node position is smaller than the value of the second snap of the node. Vehicle driving information collection method of the vehicle terminal. The method of claim 5, And when the value of the second snap is not determined, both the horizontal axis difference and the vertical axis difference are compared with the value of the first snap. The method of claim 3, wherein In the step (b), the vehicle driving information collection method of the vehicle segment, characterized in that the segment section information, the average speed, GPS speed standard deviation, the location of the creation point of the segment driving information is further included in the segment driving information. The method of claim 7, wherein The average speed of the segment section is calculated as the speed obtained by dividing the accumulated distance by GPS reception information by the travel time by GPS reception information, or calculated by averaging the vehicle speed by GPS reception information at a point of the segment section. Vehicle driving information collection method of a vehicle terminal. The method of claim 8, When the average speed of the segment section is obtained by averaging the vehicle speed at the point, the vehicle driving information collection method of the vehicle terminal, characterized in that for correcting the point speed according to [Equation 5]. [Equation 5]

In a traffic information system including a center apparatus, a base station, and a vehicle terminal, a vehicle terminal mounted on a vehicle, A control device for collecting vehicle driving information and displaying road traffic information, The control device, A map information storage unit for storing map information including node and link information; A GPS receiver for receiving GPS reception information including a location and a speed of the vehicle; A node matching determination unit determining whether the vehicle departs or arrives at the node; When the vehicle leaves the first node, the segment driving information including the segment length and the passing time is obtained and stored at intervals of time or length in segments, and when the vehicle arrives at the second node, the segment from the previous segment to the second node. A driving information collection unit for obtaining and storing driving information; And a driving information transmission unit for transmitting the stored segment driving information to the base station when the base station is connected to the base station. The control device, A communication information receiving unit for receiving communication information in units of segments from the center apparatus through a base station; The vehicle terminal of the traffic information system, characterized in that further comprising a traffic information display unit for displaying the traffic information on the display in units of segments. The method of claim 10, wherein the node matching determination unit, If the position of the vehicle enters the first node and then advances, it is determined that the vehicle leaves the first node, and if the position of the vehicle enters the second node and then enters the second node, Judged, If the position of the vehicle enters the first node after entering the previous node, it is determined that the vehicle departs from the first node, and if the position of the vehicle enters the second node after entering the first node, the vehicle arrives at the second node. Vehicle terminal of the traffic information system, characterized in that judged to. The method of claim 12, wherein the node matching determination unit, If the horizontal axis difference between the vehicle position and the node position is greater than the value of the first snap of the node or the longitudinal axis difference between the vehicle position and the node position is greater than the value of the second snap of the node, it is determined that the node is advancing, And when the horizontal axis difference between the vehicle position and the node position is smaller than the value of the first snap of the node, and the vertical axis difference between the vehicle position and the node position is smaller than the value of the second snap of the node. Vehicle terminal of traffic information system. The method of claim 13, wherein the node matching determination unit, And when the value of the second snap is not determined, both the horizontal axis difference and the vertical axis difference are compared with the value of the first snap.

Images