JP2007333651A - Route guidance system and navigation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a route guidance system and a navigation system that can provide guidance information even when network communication congests in a disaster or the like. <P>SOLUTION: The route guidance system includes the on-board navigation system 001 and a portable terminal 002. The navigation system 001 has a destination input means 003 for inputting a destination, a position detection means 008 for detecting a vehicle position, a map data storage means 007 storing map data, a route search means 004 for searching for a route from the position to the destination, and a transmission means 006 for transmitting route information and map data on the route found to the portable terminal 002. The portable terminal 002 has a reception means 010 for receiving the route information and map data, and a guidance means 011 for displaying a map of the map data with the route by the route information drawn on a display device. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a route guidance system and a navigation system that provide a route to a destination, and more particularly to a route guidance system and a navigation system that provide the route by a portable terminal.

  If a major disaster occurs, it is recommended to move to the nearest shelter, but if you encounter a disaster on the go, you often do not know the location and location of nearby shelters. On the other hand, a guidance system has been proposed that provides a route to a evacuation center to a terminal carried by a user when a disaster occurs (see, for example, Patent Document 1). In the guidance system described in Patent Document 1, a terminal carried by a user and a server can be connected via a network, and when a disaster occurs, a route to the evacuation site is searched based on the user's registered location and the evacuation location. To the user's terminal. The user can move to the evacuation site while referring to the route displayed on the terminal.

In addition, an evacuation guidance system that accurately obtains the current position of the user and provides a route to the evacuation site has been proposed (see, for example, Patent Document 2). In the guidance system described in Patent Document 2, a position detection unit mounted on a terminal detects a position and transmits the position to a guidance host device connected via a network. The guidance host device detects an evacuation site near the current position, searches for a route to the evacuation site, and transmits it to the user terminal together with map information.
JP 2004-20240 A JP 2005-17027 A

  However, when a disaster occurs, access (call) is congested to a base station in the area where the disaster occurs, and the processing capacity of the exchange is exceeded or traffic restrictions are applied, and communication is often limited. Therefore, as described in Patent Document 1 or 2, it is actually difficult to receive guidance information to the evacuation site via a network at the time of a disaster.

  In view of the above problems, an object of the present invention is to provide a route guidance system and a navigation system that can provide guidance information even when communication congestion occurs in a network when a disaster occurs.

  In view of the above problems, the present invention is a route guidance system comprising an on-vehicle navigation system and a mobile terminal, the navigation system including a destination input means for inputting a destination and a position detection for detecting the position of the vehicle. Means, a map data storage means for storing map data, a route search means for searching for a route from the position to the destination, and a transmission means for transmitting the route information of the searched route and map data to the portable terminal. The portable terminal includes receiving means for receiving route information and map data, and guidance means for displaying a map of map data on which the route of the route information is written on a display device.

  According to the present invention, the map data and the route to the destination are transmitted to the mobile terminal without going through the network, so that the route guidance can provide guidance information even if communication congestion occurs in the network in the event of a disaster or the like A system can be provided.

  To provide a route guidance system and a navigation system capable of providing guidance information even when communication congestion occurs in a network when a disaster occurs.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In the route guidance system according to the present embodiment, the evacuation site near the current position, the map data, and the route to the evacuation site acquired by the vehicle navigation system are transmitted to the mobile terminal, and the mobile terminal displays the map and the route. Since the navigation system and the mobile terminal communicate with each other without going through the network, the user can acquire the evacuation route to the evacuation site while avoiding network congestion at the time of a disaster.

  Fig.1 (a) shows the system block diagram of the route guidance system in this Embodiment. The route guidance system includes an on-vehicle navigation system 001 and a portable terminal 002.

  FIG. 1B shows a hardware configuration diagram of the navigation system 001. The navigation system 001 includes a navigation ECU (Electronic Control Unit) 100 that controls the system, a GPS receiver 110 that receives radio waves from a GPS (Global Positioning System) satellite, a communication unit 110 that communicates with a mobile terminal 002, and a user. An input device 130 for inputting the operation, a storage device 140 for storing a map database 007, a shelter database 009, and the like, and a display device 150 for displaying a map and a route.

  The navigation ECU 100 stores a CPU (Central Processing Unit) that executes a program, a ROM (Read Only Memory) that stores a program, a RAM (Random Access Memory) that temporarily stores data and a program, and holds even when the power is turned off. An NV-RAM (Non-Volatile RAM) that stores information to be stored, a communication unit that communicates with other ECUs, an input / output interface that inputs and outputs data, and the like are configured as a microcomputer. Each function of the navigation system described later is realized by the CPU executing the program.

  The portable terminal 002 is, for example, a cellular phone, a portable computer, an electronic notebook (personal digital assistant (PDA)), a PHS (Personal Handyphone System), a portable personal computer, iPOD (registered trademark), or the like. That is, it is only necessary to have a display device (preferably an audio output device) that can communicate with the navigation system 001 by boundary communication and displays a map on which a route is described. Moreover, the portable terminal 002 is not restricted to what a vehicle user owns.

  Similarly, the portable terminal 002 includes a CPU that executes a program, a ROM that stores programs, a ROM and flash memory that stores data and programs, an input / output device that inputs and outputs data, an NV (Non Volatile) -RAM, communication A device or the like is configured as a computer connected via a bus.

  The navigation system 001 includes a destination input unit 003, a route search unit 004, a route guidance unit 005, a communication control unit 006, a position acquisition unit 008, a map database 007 (hereinafter referred to as a map DB) storing map data, and a shelter location. It has a shelter database 009 (hereinafter referred to as a shelter DB) that stores the positions.

  The destination input unit 003 provides an interface with the user, and has a function of acquiring a user operation such as destination input and route search in a non-disaster. The destination input unit 003 has a hardware resource (for example, the input device 130) configured by a touch panel type operation panel that allows a user to display an operation unit and input an operation, a remote controller, and the like. The user's operation content is accepted according to the button that has been selected. In this embodiment, an evacuation site search request operation is received from the user, and an evacuation site search request is sent to the route search means 004.

  Note that an operation may be input by providing a microphone and recognizing a voice uttered by a user with a voice recognition circuit. When inputting a destination, the user can input a search request for a shelter by, for example, saying “Search for shelter”.

  The position detection means 008 detects the position of the own vehicle. The position detection means 008 detects the current position by a known radio navigation such as GPS. In brief, the position detection means 008 calculates the arrival time of the radio wave transmitted from the GPS satellite received by the GPS receiver 110, and calculates the arrival time and the distance from the light velocity c to the captured GPS satellite. Preferably, the distance between three or more GPS satellites and the host vehicle is calculated, and a point where a spherical surface having a radius of each GPS satellite intersects is detected as the position of the host vehicle.

  While the host vehicle is traveling, the position detection unit 008 uses the vehicle speed sensor and the gyro sensor to accumulate the travel distance and travel direction at the position measured by the radio wave from the GPS satellite, and autonomously navigates the current vehicle position. Estimate the position accurately. Note that the position of the host vehicle displayed on the map may be further corrected by a map matching method that associates the estimated position of the host vehicle with the map.

  The shelter information DB 009 stores addresses and coordinates as position information of the shelters. Since the local governments such as municipalities predetermine the evacuation shelter at the time of disaster, the location information of the evacuation shelter determined by the local government is stored in a hard disk device, NV-RAM or the like provided in the navigation system 001. Since there is a possibility that the hard disk device may be damaged during a disaster, it is preferable to store the location information of the refuge in a plurality of storage devices. In addition, the information on each evacuation center preferably stores not only the location information but also information on the number of people, size, toilets, and other facilities (hereinafter referred to as location information, size, facilities, etc.). Information is simply referred to as shelter information).

  The map DB 007 is configured by a recording medium such as a hard disk, a DVD (Digital Versatile Disk), or a flash memory. The map DB 007 stores map data such as road networks and intersections in association with latitude and longitude. The map data is configured as a table-like database by associating an actual road network with nodes (points where roads and roads intersect, for example, intersections) and links (roads connecting nodes and nodes).

  The route search means 004 searches the route from the position of the host vehicle detected by the position detection means 008 to the destination with reference to the map DB 007. In this embodiment, the destination is an evacuation center, but since there are multiple evacuation centers, the nearest evacuation center from the position of the host vehicle may be used as the destination. It may be displayed on the device and selected by the user.

  When the evacuation center as the destination is input from the destination input unit 003, the route search unit 004 searches for an evacuation route with a low passing cost to the evacuation site by, for example, the Dijkstra method. In the Dijkstra method, the passage cost of each road section is calculated for several route candidates, and after a suitable number of processing times or when a predetermined condition is satisfied, a route candidate having a low passage cost is searched for as an optimal route.

  The passage cost mainly includes a link cost indicating a cost (corresponding to a distance) when passing a road and a node cost indicating a right / left turn cost at an intersection. Since the road at the time of disaster is moved on foot to the evacuation center, the passage cost of the wide road is reduced. In the case of walking, turning left and right does not significantly affect the arrival time, so the cost of turning right and left can be reduced. Therefore, it is possible to search for a route suitable for an evacuation route at the time of a disaster under the setting of a passing cost different from that when the vehicle travels.

  Further, it is preferable that the route search means 004 searches for a plurality of evacuation routes for the same destination. If a plurality of evacuation routes are searched, even if there is a difficult passage on one evacuation route, it is possible to move to another evacuation route along another evacuation route.

  In addition, in order to support those who move on foot in the event of a disaster, a return support station that provides water, toilets, information, etc. is designated in advance by the local government. In addition, support systems are also provided by gas stations and convenience stores. In order to use such a facility, it is preferable that the route search means 004 searches for an evacuation route via a return home support station or the like, and when the return home support station or the like is not near the evacuation route, the return home support is provided. It is preferable to extract the position information of the station and write the position on the map along with the evacuation route.

  In the map data, landmark features such as place names, buildings, intersections, and signs are recorded. The route search means 004 creates a list in which the features on the created evacuation route are arranged in order as landmarks for route guidance to the evacuation site. This list may be edited into text describing how to follow the path according to the order. The list includes distances between features (hereinafter, the map data and the list of features are referred to as guidance information).

  The route guidance unit 005 extracts map data including the evacuation route from the map DB 007 and associates the position of the vehicle, the evacuation route and the position of the evacuation site with the map data and displays them on the display device 150.

  The map data, the evacuation route, and the like can be displayed as they are by the display device 150 of the navigation system. However, since the navigation system uses both vector data and raster data as map data, the portable terminal 002 also has application software for displaying the map data of the vector data in order to display the map data. Is preferred.

  Since the mobile terminal 002 may not have dedicated application software for displaying map data, in the present embodiment, a format that can be displayed by the mobile terminal 002 (for example, JPEG, BMP, PDF (Portable Document Format). ) Etc.) can be converted into map data.

  The route guidance unit 005 may create an audio file that reads out text explaining how to follow the road according to the order of the feature list. The audio file is created, for example, as an MP3 (MPEG Audio Layer-3) format file.

  The communication control unit 006 controls the communication device 120 to transmit guidance information to the portable terminal 002. The communication device 120 provides a function of communicating with the portable terminal 002 by narrow area communication. The narrow-area communication of the present embodiment refers to communication that is performed almost in the line of sight without going through a network. For example, road-to-vehicle communication such as Bluetooth, DSRC (Dedicated Short-Range Communication), wireless LAN, infrared Communication, wired connection, etc.

  In the case of Bluetooth, the communication device 120 establishes communication with the portable terminal 002 in a predetermined procedure, and performs predetermined Bluetooth wireless communication such as D / A conversion, modulation, frequency conversion, amplification, etc. for the guidance information (digital data). Processing according to the protocol is performed, and the radio wave is output from the antenna and transmitted to the portable terminal 002. In addition, a radio wave from the portable terminal 002 is received by an antenna and subjected to processing according to a predetermined Bluetooth wireless communication protocol such as signal amplification, frequency conversion, demodulation, A / D conversion, and the like, and data is received.

  In Bluetooth, communication is performed according to a lower layer profile GAP (Generic Access Profile) for connecting / authenticating / encrypting a device and a protocol (profile) established for each type of device to communicate. For example, HSP (Headset Profile) enables communication between a headset (microphone and earphone) equipped with Bluetooth and the portable terminal 002. In HFP (Hands-Free Profile), a portable terminal 002 and a navigation system 001 are connected to enable a hands-free call using a vehicle microphone or speaker. Further, SPP (Serial Port Profile) makes it possible to create a virtual serial port in a Bluetooth device and transfer data from the navigation system 001 to the portable terminal 002 (or vice versa).

  When the information terminal 4 and the in-vehicle device are connected by wire like a wired hands-free device, the guidance information is communicated by a predetermined protocol, and when the information terminal 4 is connected by a wireless LAN, the guidance information is transferred by a predetermined protocol such as IP. To do.

  The communication means 010 of the portable terminal 002 also has a similar profile and receives guidance information from the navigation system 001.

  The guidance means 011 of the portable terminal 002 displays the received guidance information on the display device of the portable terminal 002, and outputs from the speaker if there is an audio file. The guide unit 011 is realized by the CPU executing the application software.

  Since the portable terminal 002 includes application software for displaying image data such as photographs and illustration data, the CPU executes the application software to display a map from map data whose format has been converted into image data. be able to. Since the portable terminal 002 has browser software, if image data of map data is designated as the description content of HTML (HyperText Markup Language), guidance information can be displayed by the browser software. In this case, the HTML data is generated by the route guidance unit 005 of the navigation system 001. When the guidance information is converted into a PDF file, the map is displayed by the PDF viewer application software.

  When the guidance information is converted into HTML or PDF, the feature list can be displayed by the same application software as the map data.

  The user can move along the evacuation route to the evacuation site by the guidance information displayed / output in this way.

  Based on the above configuration, a processing procedure until the portable terminal 002 receives the guidance information will be described based on the flowchart of FIG.

  When a disaster occurs and it becomes difficult for the vehicle to travel, an evacuation route search request is input by the user operating the operation panel of the navigation system 001 (S1). Accordingly, it is assumed that the destination input unit 003 has been operated to set a refuge near the current position as the destination.

  Next, the position detecting means 008 detects the position of the host vehicle or has already detected the position (S2), and therefore extracts the evacuation area information near the current position from the evacuation area DB 009 (S3). You may extract the refuge information near the home position.

  Since the extracted shelter information is displayed on the display device of the navigation system 001, the user selects a shelter to move based on the position, size, etc. of the shelter.

  When the evacuation site is selected by the user, the route search means 004 searches for an evacuation route (S4). The route search means 004 extracts map data including the evacuation route from the map DB 007, and associates the evacuation route, the current position, the evacuation center, the position of the return home support center, and the like with the map data. In addition, a list in which the features on the evacuation route are arranged in order is created. If necessary, the route guidance unit 005 converts the guidance information into a format that can be displayed on the portable terminal 002.

  Next, the communication control means 006 connects to the portable terminal 002 (S5). The mobile terminal 002 may be connected in any way, but in this embodiment, communication is performed using Bluetooth.

  FIG. 3 is a flowchart showing an example of a communication procedure of Bluetooth communication. The communication control unit 006 transmits a device search signal to the mobile terminal 002, and the mobile terminal 002 receives the device search signal and performs Bluetooth authentication to establish a wireless connection with the mobile terminal 002. Thereafter, the information communication mode to go into. Note that the communication control unit 006 and the communication unit 010 are already paired with a pass key (authentication key or PIN).

  When the guidance information is generated, the communication control unit 006 starts transmitting a device search signal (S101).

  Since the mobile terminal 002 that has received the device search signal transmits a response signal, the communication control unit 006 determines whether or not the response signal is received (S102). The response signal is a signal that transmits a signal in response to the transmitted device search signal.

  Upon receiving the response signal, the communication control unit 006 performs Bluetooth authentication processing (S1103). Specifically, the connection with the portable terminal 002 is established based on whether or not the pass keys match using the above pass key.

  If the authentication is successful, a connection capable of transmitting guidance information is established between the navigation system 001 and the portable terminal 002 (S104).

  Returning to FIG. 2A, the communication control unit 006 determines whether or not the connection has been established (S6). If the connection is established (Yes in S6), the communication control unit 006 transmits the guidance information to the portable terminal 002. Start (S7). If the connection could not be made (No in S5), the connection to the portable terminal 002 is attempted again. The communication control unit 006 disconnects the connection when the guidance information has been transmitted (S8).

  FIG. 2B is a flowchart showing a flow of processing in which the portable terminal 002 receives guidance information and guides an evacuation route.

  As described with reference to FIG. 3, when the mobile terminal 002 receives a device search signal from the communication control unit 006, it returns a response signal, and then establishes a connection when the passkeys transmitted with each other match (S11).

  When the connection is established (Yes in S11), guidance information is received from the navigation system 001 (S12). When the reception of the guidance information is completed, the route guidance is started based on the guidance information received by the guidance unit 011 (S13).

  FIG. 4A is a diagram showing an example of a map on which evacuation routes are written. In FIG. 4A, the position where the vehicle 10 is located is the current position, and the evacuation center 20 is the destination. A dotted line L1 indicates the evacuation route searched by the route search means 004, and a dotted line L2 indicates the evacuation route via the return home support center 30. The user may move along a desired route or may make a selection before receiving the guidance information. In addition, the landmarks are marked with numbers in order of passing.

  FIG. 4B is a diagram illustrating an example of a list of features on the evacuation route L1. First, since the total distance of the evacuation route L1 is displayed as xx [km], the user can know how far to walk to the evacuation site 20.

  In addition, the same number as the map number is assigned to each feature. By viewing the list of features, the user can know that “convenience store”, “supermarket”, etc. are routed in order from the current position.

  For example, the guide unit 011 switches and displays the map in FIG. 4A and the feature list in FIG. 4B by a user operation. Therefore, when moving while looking at the map of FIG. 4A and the evacuation route L1, it is determined whether or not the evacuation route L1 is moving depending on whether the feature of FIG. 4B appears on the evacuation route L1. it can.

  In addition, the section distance is written for each feature. For example, the section distance A of “Convenience Store” is the distance from the position of the vehicle 10 to “Convenience Store”, and the section distance B of “Super XX” is the distance from “Convenience Store” to “Super XX”. is there. By referring to the section distance, the user can know how far to walk to the next feature, and if the user has left the evacuation route L1, the user can move to the next place even if the section distance is exceeded. Since it does not reach the object, it can be noticed early that it has deviated from the evacuation route L1.

  Since it is often difficult to display the entire area of the map of FIG. 4A on the display device of the portable terminal 002, the guiding unit 011 displays only an appropriate area on the display device of the portable terminal 002. In FIG. 4A, a region A displayed at a time on the display device of the portable terminal 002 is surrounded by a dotted line. The guide unit 011 displays a map of the area A at a scale suitable for movement by walking. In addition, when the user moves out of the area A as the user moves, the user can scroll the display range. Further, the guide unit 011 may automatically and slowly scroll the display range by setting the walking speed (for example, 60 m to 80 m) by the user. When scrolling automatically, scrolling can be stopped by a user operation.

  As described above, according to the mobile route guidance system of this embodiment, even if a disaster occurs and the communication network is congested, the user can evacuate because the evacuation route can be transmitted to the mobile terminal 002 without going through the communication network. The evacuation route to the place can be grasped quickly and reliably. Since the searched evacuation route is an appropriate route for moving during a disaster, the user can move safely during a disaster.

It is a system configuration figure of a route guidance system. It is a flowchart figure which shows the process sequence until a portable terminal receives guidance information, and a flowchart figure which shows the flow of the process which a portable terminal receives guidance information and guides an evacuation route. It is. It is a flowchart figure which shows an example of the communication procedure of Bluetooth communication. It is a figure which shows an example of the map with which the evacuation route was described, and an example of the list of features.

Explanation of symbols

001 Navigation system 002 Mobile terminal 003 Destination input means 004 Route search means 005 Route guidance means 006 Communication control means 007 Map DB
008 Position detection means 009 Shelter DB
010 Communication means 011 Guiding means

Claims (4)

A route guidance system composed of an on-vehicle navigation system and a mobile terminal,
The navigation system includes:
Destination input means for inputting a destination; position detection means for detecting the position of the vehicle;
Map data storage means for storing map data; route search means for searching for a route from the position to the destination;
Transmission means for transmitting the route information of the searched route and the map data to the mobile terminal,
The portable terminal is
Receiving means for receiving the route information and the map data;
A route guidance system, comprising: a guide unit configured to display a map of the map data in which a route of the route information is described on a display device. The navigation system has a shelter data storage unit that stores location information of a shelter,
If there is an input to the evacuation center as the destination by the destination input means,
The route search means extracts the shelter within a predetermined distance from the position detected by the position detection means from the shelter data storage means, and searches for a route from the position to the shelter.
The route guidance system according to claim 1.   The route guidance system according to claim 1, wherein the navigation system and the mobile terminal communicate with each other by boundary communication. Destination input means for inputting a destination; position detection means for detecting the position of the vehicle;
Map data storage means for storing map data; route search means for searching for a route from the position to the destination;
The navigation system which has the transmission means which transmits the path | route information and the said map data of the said searched path | route directly to a portable terminal.

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