JP2008116262A - On-vehicle navigation apparatus and display method of roundabout - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an "on-vehicle navigation apparatus and display method of roundabout" where two annular passages share a part, and that can retrieve and display even a connected special roundabout. <P>SOLUTION: The "on-vehicle navigation apparatus and display method of roundabout" includes a storing means for storing map data including identification information attached to each annular passage so that each annular passage constituting the roundabout can be individually identified, a displaying means for displaying guide information, and a controlling means for reading a specific annular passage corresponding to a specific identification code from the storing means, or reading all annular passages constituting the roundabout including the specific annular passage, and making the displaying means display the specific annular passage or all annular passages. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle-mounted navigation device and a roundabout display method, and more specifically, a vehicle-mounted navigation device and a roundabout that provide display guidance for a roundabout in which two or more circular roads share a part and are connected. It is related to the display method of about.

  In the conventional typical vehicle-mounted navigation device, the position of the vehicle on the map data and the guidance route for the vehicle to reach the destination are displayed.

  In general, in order to perform these, in-vehicle navigation devices define intersections, junctions, and branch points of roads including inflection points such as curves of a predetermined angle or more as nodes, and roads connecting the nodes as links. And a collection of links is stored as map data.

  However, among the various branch points, although not seen in Japan, a relatively large number of roundabouts (circular roads) in Europe and the United States could not be searched. In view of this, it has become possible to easily retrieve a roundabout by assigning an attribute representing the roundabout to the nodes and links constituting the roundabout (see Patent Document 1).

  Based on the road map including such a roundabout, the vehicle-mounted navigation device performs route guidance as follows.

That is, when the starting point and the destination are input, the control device searches the map data and displays one guide route selected by a specific algorithm. Here, when the guidance route includes a node and a link having a roundabout attribute, the control device identifies a set of nodes and links having the roundabout attribute as a roundabout. Next, the control device reads the roundabout and its surrounding road data and other necessary data from the storage device, and causes the display device to display a road map of a necessary range including the roundabout. Next, the own vehicle position detection device detects the own vehicle position, and based on this, the control device displays the own vehicle on the road map and guides the own vehicle to the destination.
JP 2004-117268 A

  By the way, in China and the like, there is a so-called twin roundabout in which two circular roads share a node or a part of a link and are connected. In this case, even if the roundabout attribute is given to the nodes and links constituting the twin roundabout, it is not easy to search and display the twin roundabout.

  That is, in a normal roundabout, when all nodes and links that make up the roundabout are sequentially traced from the node that entered the roundabout and returned to the first node, the controller determines that it has made a roundabout roundabout. And display. However, when this is applied to the twin roundabout, it is impossible to return to the ingress node by sequentially tracing all the links constituting the twin roundabout, resulting in an infinite loop. For this reason, the twin roundabout cannot be displayed.

  The present invention was created in view of the above-described problems in the prior art, and a vehicle-mounted navigation system that can search and display even a special roundabout in which two circular roads share a part and are connected. An apparatus and a roundabout display method are provided.

  In order to solve the above-described problems of the prior art, in the basic form of the present invention, there is provided an in-vehicle navigation device that provides a roundabout display guidance in which two circular roads share a part and are connected. Storage means for storing map data including identification information given to each circular road so that each circular road constituting the roundabout can be individually identified, display means for displaying guidance information, and the storage means And a control means connected to the display means, wherein the control means reads out the specific circular path corresponding to the specific identification information from the storage means, or includes a roundabout including the specific circular path The vehicle-mounted navigation device is characterized in that all the circular roads constituting the vehicle are read out and the specific circular road or all the circular roads are displayed on the display means. There is provided.

  According to the vehicle-mounted navigation device according to the present invention as described above, in a roundabout in which two circular roads share a part, for example, a part of a node or a link, and are connected, each annular constituting the roundabout Storage means for storing map data including identification information given to each circular road so that the roads can be individually identified is provided.

  Thereby, each circular path which comprises a roundabout can be read out individually from the memory | storage means of map data based on identification information. Each read circular path includes a part of the shared nodes and links, and all the nodes and links constituting the circular path are sequentially traced from the entry node to the circular path. As you go, you can go around the loop and return to the first node. Therefore, since the control means can determine that each circular road is equivalent to the roundabout, it is possible to search and display a specific circular road or all the circular roads constituting the roundabout.

  According to another basic aspect of the present invention, there is provided a roundabout display method in an in-vehicle navigation device that performs display guidance for a roundabout in which two circular roads share a part and are connected to each other. Each ring road that constitutes the about is assigned with identification information so that each ring road can be individually identified and stored, and the specific ring road corresponding to the specific identification information is read, or the specific ring road There is provided a roundabout display method characterized in that all the circular roads constituting the roundabout including the circular road are read and the read specific circular road or all the circular roads are displayed.

  According to the roundabout display method according to the present invention as described above, in a roundabout in which two circular roads share a part of, for example, a part of a node or a link and are connected, each of which constitutes the roundabout. Identification information is assigned and stored in each circular path so that each circular path can be individually identified.

  Thereby, each circular path which comprises a roundabout can be read separately based on identification information. Each read circular path includes a part of the shared nodes and links, and all the nodes and links constituting the circular path are sequentially traced from the entry node to the circular path. As you go, you can go around the loop and return to the first node. Therefore, since each of the circular roads can be determined as a roundabout, it is possible to search for and display a specific circular road or all of the circular roads constituting the roundabout.

  As described above, according to the in-vehicle navigation device of the present invention, in a roundabout in which two annular roads share a part and are connected, each annular road constituting the roundabout can be individually identified. Thus, there is provided a map data storage means for storing the identification information given to each circular road.

  As a result, the control means can read each circular path based on the identification information, and can further determine that each circular path is equivalent to a normal roundabout. It is possible to search and display the circular roads or all the circular roads using the display means.

  Further, according to the roundabout display method of the present invention, in the roundabout in which two circular roads share a part and are connected, the respective circular roads constituting the roundabout can be individually identified. Each circular path is assigned an identification code and stored.

  As a result, each circular path can be read based on the identification information, and each circular path can be determined to be equivalent to a normal roundabout. Can be searched and displayed.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(Description of configuration of in-vehicle navigation system)
The in-vehicle navigation device according to an embodiment of the present invention can perform normal route guidance, and in particular, a twin roundabout in which two circular roads share a node or a part of a link and are connected. Is useful for confirming the position of the vehicle and for guiding the route.

  Below, the twin roundabout which can be displayed by the vehicle-mounted navigation device of the present invention will be described with reference to FIG. 2 and FIG. FIGS. 2A, 2B and 3 are diagrams schematically showing such a twin roundabout.

(First twin roundabout)
The first twin roundabout has a configuration as shown in FIG. In other words, in the first twin roundabout, a part of the link is shared and the first annular path and the second annular path are connected. Hereinafter, the shared link is referred to as a shared link. Each annular path has a circular shape or a shape similar to a circular shape.

  Each of the first and second annular paths is composed of one or more links and nodes at both ends of the links.

  Regarding links, the links constituting the first circular path include a link to which the attribute of roundabout 1 is assigned and a link (shared link) to which the attribute of roundabout link 3 is assigned. The link to be configured includes a link to which the attribute of roundabout 2 is assigned and a link to which the attribute of roundabout link 3 is assigned. The links to which the attributes of roundabouts 1 and 2 are assigned consist of 1 or more, and the links to which the attribute of roundabout link 3 is assigned also consist of 1 or more.

  Regarding the nodes, the nodes constituting the first circular path are the shared nodes at both ends of the shared link, and one or more branch paths (not shown) that branch from the first circular path and the first circular path ( Link) and a connection node. In addition, the nodes constituting the second circular path include the shared nodes at both ends of the shared link and one or more branch paths (links) that branch from the second circular path and the second circular path (not shown). ) And a connection node.

(Second twin roundabout)
The second twin roundabout has a configuration as shown in FIG. That is, in the second twin roundabout, the first annular path and the second annular path are connected by sharing a shared link.

  Except for the fact that each annular path has a rectangular shape, it is similar to the first twin roundabout shown in FIG. 2 (a), and the detailed description follows that of the first twin roundabout. .

(Third twin roundabout)
The third twin roundabout has a configuration as shown in FIG. That is, in the third twin roundabout, the first circular path and the second circular path are connected to share a node. A node shared by the first ring road and the second ring road is referred to as a shared node. Both of the annular paths have a rectangular shape.

  Each of the first and second circular paths is composed of one or more links and nodes at both ends of the links.

  Regarding the link, the link constituting the first circular path includes a link having the roundabout 1 attribute, and the link constituting the second circular path includes a link having the roundabout 2 attribute. . The links to which the attributes of roundabouts 1 and 2 are assigned include one or more links.

  Regarding the node, the nodes constituting the first circular path are a connection between the shared node and one or more branch paths (links) that branch from the first circular path (not shown). The node that includes the node and constitutes the second circular path is a shared node, and although not shown, one or more branch paths (links) that branch from the second circular path and the second circular path Connection nodes.

  Next, the configuration of the in-vehicle navigation device according to one embodiment of the present invention will be described.

  FIG. 1 schematically shows the configuration of the vehicle-mounted navigation device.

  In the in-vehicle navigation device 20 shown in FIG. 1, reference numeral 1 denotes a DVD-ROM drive. The DVD-ROM 1a driven by the DVD-ROM drive 1 has scale levels (/ 1/12500, 1/25000, Map data divided into longitude and latitude widths of appropriate sizes in accordance with 1 / 50,000, etc.) is stored in advance. This map data is represented by a coordinate set of points (nodes) expressed in longitude and latitude.

  Map data includes road layers for map matching and route search, background layers for displaying various properties such as roads, parks, rivers, landmark buildings and facilities on map drawings, and administrative division names such as municipalities It consists of a character / symbol layer for displaying characters such as road names and building names, map symbols, and the like. Of the various layers constituting the map data, the character / symbol layer may include an intersection name, a normal roundabout name, a twin roundabout name, and the like.

  In the following, the data structure of the road layer particularly related to the present invention will be mainly described. FIG. 4 is a diagram showing the data structure of the road layer according to the embodiment of the present invention. FIG. 5 is a diagram showing the content of data corresponding to the link type so far, for comparison with the content of data corresponding to the link type in the data structure of the road layer of FIG.

  Various data included in the road layer includes road data, guidance data, drawing data, route calculation data, search data, and the like, as shown in FIG. Below these, further necessary data is organized and stored hierarchically. In various data included in the road layer, the road is represented by a set of nodes and links. The node is associated with a road branch point including an intersection, a junction, and a bending point such as a curve having a predetermined angle or more. The link is associated with a road portion connecting two nodes.

  Road data is composed of data such as link shape data, node information consisting of all the nodes that make up the road, link information consisting of all the links that make up the road, and connection information that shows the connection relationship between nodes and links. Has been.

  Of these, the node information is composed of data indicating the node ID, node coordinates, node type, and the like for each node. The node data constituting the twin roundabout is also stored.

  The link information includes, for each link, link ID, guidance target / non-target attribute, link width / lane information, road type, link type, link length indicating the link length, link start and end coordinates, etc. It consists of attribute information. Identification information that can individually identify the two circular paths constituting the twin roundabout shown in FIGS. 2 to 3 is assigned and stored in the hierarchy below the link type.

  In the case of this embodiment, for each twin roundabout, as shown in FIG. 4, identification information of the roundabout link 3 is given to the shared link shared by the first ring road and the second ring road, Of the links constituting the first ring road, identification information called roundabout link 1 is given to the links excluding the shared links, and rounding is performed on the links constituting the second ring road except the shared links. The identification information “about link 2” is given and stored. Up to now, there is no information for identifying the twin roundabout. As shown in FIG. 5, only the identification information common to these roundabouts is provided for the normal and twin roundabouts. It was not stored.

  Other map data includes data indicating the relationship between a node or link and a road name, and data indicating the relationship between a link including a node or roundabout link, an intersection name, and normal and twin roundabout names. ing.

  In the illustrated in-vehicle navigation device 20, reference numeral 2 denotes an operation unit for operating the navigation device body 10 described later. The operation unit has, for example, the form of a remote control transmitter. Although not specifically illustrated, the remote control transmitter has various operation buttons and joysticks for selecting various menus and various items on the screen of the display device (described later) and executing the selected menus. Is provided.

  Reference numeral 3 denotes a GPS receiver that receives a GPS signal sent from a GPS satellite and detects the longitude and latitude of the current position of the vehicle. Reference numeral 4 denotes a self-contained navigation sensor. The self-contained navigation sensor 4 is composed of an angle sensor such as a gyro for detecting the traveling direction of the own vehicle, and a distance sensor that generates a pulse at every predetermined traveling distance, and the position and traveling speed of the own vehicle. Used to detect The GPS receiver 3 and the self-contained navigation sensor 4 described above constitute a vehicle position detection device. In this own vehicle position detecting device, the own vehicle position is usually detected by the self-contained navigation sensor 4 and displayed on the display screen, and the own vehicle is displayed on the display screen from the road according to the position information obtained from the GPS receiver 3. The vehicle position is corrected so that it does not come off.

  Reference numeral 5 denotes a communication device such as an in-vehicle telephone for communicating with various service centers, and 6 denotes a VICS receiver that receives VICS (road traffic information communication system) information transmitted from a radio wave beacon or an optical beacon. .

  Reference numeral 7 denotes a display device such as an LCD. The display device 7 is basically based on control from a navigation device body 10 described later, and provides guidance information related to navigation (current position of the vehicle (vehicle position mark). ) And the surrounding map, a guide route from the departure place to the destination, and other guidance information) are provided to the user (especially the driver) on the screen. Further, the display device 7 displays information on the calculation and display processing performed by the in-vehicle navigation device 20 on the screen.

  Reference numeral 8 denotes a speaker. The speaker 8 provides guidance information related to the navigation to the user by voice based on control from the navigation apparatus body 10 described later.

  In the navigation apparatus body 10, reference numeral 11 denotes a buffer memory that temporarily stores map data read from the DVD-ROM 1a via the DVD-ROM drive 1.

  Reference numeral 13 denotes a map drawing unit that performs drawing processing of a map image using the map data read out to the buffer memory 11, and reference numeral 14 denotes various menu screens (operation screens), vehicle position marks, cursors, and the like according to operation conditions. An operation screen / mark generating unit 15 for generating various marks of the reference numeral 15 denotes a guide route storage unit for storing data related to the guide route. The guidance route storage unit 15 stores data relating to all nodes (coordinates of points expressed in longitude and latitude) constituting the road from the departure point to the destination of the guidance route searched by the control unit 12. . In addition, when the guidance route includes normal and twin roundabouts, data relating to the connection relationship between the link and the normal and twin roundabouts is stored. Reference numeral 16 denotes a guidance route drawing unit, which reads out the guidance route data from the guidance route storage unit 15 and displays the guidance route in a display mode different from other roads (changing the color, increasing the line width, etc.). Has a drawing function.

  Reference numeral 19 denotes an image synthesis unit, which is basically a guide route drawn by the guide route drawing unit 16 on a map image drawn by the map drawing unit 13 based on control from the control unit 12 described later. The operation screen generated by the operation screen / mark generator 14 and various marks are superimposed on each other and displayed on the screen of the display device 7. Furthermore, the image composition unit 19 also has a function of displaying information related to computation and display processing performed by the in-vehicle navigation device 20 on the screen of the display device 7 as will be described later. Reference numeral 18 denotes an audio output unit, which outputs an audio signal (guidance information related to navigation) to the speaker 8 based on control from the control unit 12.

  The control unit 12 is constituted by a microcomputer or the like and incorporates a navigation program (a program for performing display output control necessary for route search processing and route guidance based thereon). According to this program, the current position of the host vehicle is detected based on the signal output from the GPS receiver 3, and the position and traveling speed (vehicle speed) of the host vehicle are calculated based on the signal output from the autonomous navigation sensor 4. Or the map data to be displayed is read from the DVD-ROM 1 a to the buffer memory 11 via the DVD-ROM drive 1, or based on the search conditions set using the map data read to the buffer memory 11. Various processes related to navigation such as searching for a guidance route from (the current position of the vehicle) to the destination are executed. Furthermore, the control unit 12 has a function of controlling calculation and display processing performed by the in-vehicle navigation device 20.

  In addition, the control unit 12 is provided with identification information of roundabout links 1 and 2 for the first and second circular paths constituting the twin roundabout, and identification information of roundabout link 3 for the shared link. Therefore, all the nodes and links that make up each circular path can be traced in order from the entry node to the circular path, and the circuit can go around the circular path and return to the first node. It is possible to determine that the circular road is roundabout or equivalent to the roundabout and display the circular road. Then, it is detected that the identification information has changed from the roundabout link 1 to the roundabout link 2 or vice versa, and it is determined that the vehicle has entered from the first ring road to the second ring road or vice versa. Thereby, the connection information of the roundabout link 1 and the roundabout link 2 is also obtained.

  In the in-vehicle navigation device 20 configured as described above, the DVD-ROM 1a corresponds to “storage means”, the display device 7 corresponds to “display means”, and the control unit 12 corresponds to “control means”. .

  In the above-mentioned in-vehicle navigation device, map data including identification information of roundabout links 1, 2, and 3 indicating links constituting each ring road of twin roundabouts is stored. Whether the current position of the vehicle is calculated based on the information, and whether there is a ring road with identification information such as roundabout links 1, 2, and 3 within a predetermined display range from the vehicle by referring to the map data Can be searched and identified. The same applies when the guidance route includes a twin roundabout.

  When such a circular path is specified, each circular path constituting the twin roundabout can be individually read out from the map data storage means. In each read-out circular road, when all links that include the shared link and follow the circular road are sequentially traced from the entry node to the circular road, the circular road goes around the circular road. To return to the first node. Thereby, since the control part 12 can judge that each circular path is equivalent to a roundabout, respectively, it is possible to search and display a specific circular path or all the circular paths constituting the twin roundabout. It is.

(Explanation of twin roundabout display method in in-vehicle navigation system)
Next, two different methods for displaying the twin roundabout in the in-vehicle navigation device according to the embodiment of the present invention will be described.

  Two different methods for displaying the twin roundabout are: a method of displaying a twin roundabout in which the vehicle is traveling when the destination is set and the guidance route includes the twin roundabout; This is a method of displaying a twin roundabout together with an ongoing vehicle when the vehicle travels through a twin roundabout without setting a destination.

(I) Twin roundabout display method according to the embodiment of the present invention First, a guidance route is shown on a map displayed on the screen of the display device 7, and the vehicle is moved according to the guidance route. A method of displaying the twin roundabout in which the vehicle is traveling together with the vehicle when the route includes the twin roundabout will be described below.

  There are the following three display methods. These will be described in order with reference to FIG. 1, FIG. 2 (a), FIG. 4, and FIGS.

  6 to 11 are plan views showing display screens in the display device provided in the in-vehicle navigation device. In these figures, the map around the vehicle including the entire twin roundabout is displayed on the left, the map around the vehicle including the vehicle position is displayed on the right, and the vehicle position is displayed over the map. Yes. In this embodiment, the display method is applied to the first twin roundabout shown in FIG. 2A among the twin roundabouts. The guidance route is drawn as a thick line on the displayed map.

(First display method)
In the first display method, as shown in FIG. 6 to FIG. 8, only when the vehicle is traveling on a ring road with an exit where the vehicle is scheduled to exit from the twin roundabout, The entire road is displayed in an enlarged manner, and when the vehicle is traveling on a circular road without an exit, the normal enlarged display is provided.

  When this display method is employed, there are the following three cases, so the display method will be described for each of the three cases. This aspect is shown in FIGS. On both displayed screens, the vehicle is displayed with a mark that circles the arrowhead. In the displayed left screen, the name of the twin roundabout is displayed in the circled portion displayed at the bottom of the screen. Although not shown in the figure, the names of the ring roads constituting the twin roundabout may be displayed on the displayed right screen. In addition, on the displayed right screen, identification information is displayed for the connection point based on the data of the connection point (connection node) between the branch road and the ring road connected to the ring road constituting the twin roundabout. May be. These points are the same in the following second and third display methods.

(A) First case In the first case, as shown in FIG. 6, the entrance and exit of the vehicle to the twin roundabout are both in the first ring road, and the vehicle is only the first ring road. Suppose you are going out of the exit.

  First, when a destination is set, the control unit of the in-vehicle navigation device selects a guidance route with reference to map data. In this case, it is assumed that the selected guide route includes identification information indicating a circular route that forms a twin roundabout. The circular path is specified by the identification information, and the twin roundabout constituted by them is specified.

  Next, when the own vehicle traveling along the guidance route approaches the twin roundabout within a predetermined distance, the guidance including the entire twin roundabout including the circular road specified by the identification information is not shown. The route is displayed on the left side of the screen. On the right side of the screen, a normal road enlarged map is displayed together with the vehicle position.

  When the vehicle further advances according to the guidance route and enters the first round road of the twin roundabout, as shown in FIG. 6, the guidance includes the same twin roundabout as before on the left side of the screen along with the location of the vehicle. Although the route is displayed, the right side of the screen is switched, and a map including the entire first ring road is displayed together with the vehicle position. In addition, the number displayed on the right screen is identification information given to the connection point between the branch road connected to the first ring road and the first ring road constituting the twin roundabout.

  Thereafter, the same map is displayed until the vehicle advances and reaches the exit of the first ring road. At this time, the own vehicle moves on the display screen from the first annular road to the exit according to the guidance route.

(B) Second Case In the second case, as shown in FIG. 7, the entrance and exit of the vehicle to the twin roundabout are both in the first annular path, and the vehicle is in the first and second cases. Suppose you are traveling on a circular road and exiting from the exit.

  Until the own vehicle enters the twin roundabout, it is the same as the first case, so the description is omitted.

  When the own vehicle enters the first round road of the twin roundabout according to the guidance route, as shown in FIG. 7 (a), the left side of the screen includes the same twin roundabout as the previous one along with the location of the own vehicle. Is displayed, but the right side of the screen is switched, and the map including the entire first circular road is displayed together with the vehicle position. Thereafter, the same map is displayed until the vehicle travels along the first ring road and enters the second ring road. At this time, the own vehicle moves from the first annular road to the entrance of the second annular road according to the guidance route on the display screen.

  Next, when the vehicle travels according to the guidance route and enters the second roundabout of the twin roundabout as shown in FIG. 7 (b), the same twin roundabout as before is displayed on the left side of the screen along with the position of the vehicle. The guidance route including the entire vehicle is displayed, but the right side of the screen is switched, and a map around the vehicle including the vehicle position is enlarged and displayed together with the vehicle position. At this time, the map around the vehicle changes from moment to moment as the vehicle progresses. This display method continues until just before the vehicle exits the second ring road and enters the first ring road.

  Next, when the vehicle further proceeds according to the guidance route and enters the first circular road as shown in FIG. 7C, the right side of the screen is switched, and the map including the entire first circular road together with the position of the vehicle. Is enlarged. This display method continues until the vehicle reaches the exit of the first ring road.

(C) Third Case In the third case, as shown in FIG. 8, the entrance of the own vehicle to the twin roundabout is in the first annular road, the exit is in the second annular road, and the own vehicle Is assumed to travel through the first and second circular paths and exit from the exit.

  Until the own vehicle enters the twin roundabout, it is the same as the first case, so the description is omitted.

  When the vehicle enters the first roundabout of the twin roundabout according to the guidance route, as shown in FIG. 8 (a), on the left side of the screen is a map that includes the same twin roundabout as before, along with the location of the vehicle. Although displayed, on the right side of the screen, a map around the vehicle including the vehicle position is enlarged and displayed together with the vehicle position. At this time, the map around the vehicle changes from moment to moment as the vehicle progresses. This display method continues until just before the vehicle exits the first ring road and enters the second ring road.

  Next, when the vehicle further proceeds according to the guidance route and enters the second annular road as shown in FIG. 8B, the same twin roundabout as before is displayed on the left side of the screen together with the position of the vehicle. The map including the map is displayed, but the right side of the screen is switched, and the map including the entire second ring road is displayed together with the vehicle position. This display method continues until the vehicle reaches the exit of the second ring road.

(Second display method)
In the second display method, each of the two circular roads constituting the twin roundabout is enlarged and displayed on the entire circular road in which the vehicle is traveling.

  When this display method is employed, there are the following two cases, so the display method will be described for each of the two cases. This aspect is shown in FIGS. 9 to 10, respectively.

(A) First case In the first case, as shown in FIGS. 9A to 9C, both the entrance and the exit of the vehicle to the first twin roundabout are in the first annular path. Suppose that the vehicle travels through the first and second annular roads and exits from the exit.

  The difference from the first case of the first display method is that in the first case of the first display method, the map around the own vehicle including the own vehicle is enlarged and displayed on the second ring road without exit. On the other hand, in this case, as shown in FIG. 9 (b), a map including the entire second annular road as well as the vehicle position is enlarged and displayed even on the second annular road without an exit. is there.

  That is, a map including the entire first ring road, as the host vehicle moves, as the host vehicle proceeds as the first ring road → second ring road → first ring road, A map including the entire two circular roads and a map including the entire first circular road are enlarged and displayed in order.

(B) Second Case In the second case, as shown in FIGS. 10 (a) to (b), the entrance of the vehicle to the first twin roundabout is in the first annular path, and the exit is Assume that the vehicle is in the second partial ring road, and the vehicle travels through the first and second ring roads and exits from the exit.

  The difference from the third case of the first display method is that, in the third case of the first display method, the map around the own vehicle including the own vehicle is enlarged and displayed on the first circular road with no exit. On the other hand, in this case, as shown in FIG. 10 (a), a map including the entire first annular road as well as the position of the vehicle is enlarged and displayed even on the first annular road without an exit. .

  That is, as the host vehicle moves as the first ring road → the second ring road and the host vehicle proceed, the map including the entire first ring road and the entire second ring road are continuously displayed. The map that contains it is enlarged in order.

(Third display method)
In the third display method, the entire twin roundabout is enlarged and displayed regardless of which of the circular roads is in progress.

  When this display method is employed, there is the following one case, and the display method will be described with respect to that case. This aspect is shown in FIG.

  In that case, the entrance of the vehicle to the twin roundabout is in the first ring road, the exit is in the second partial ring road, and the vehicle passes through the first and second partial ring roads and exits. Suppose you leave.

  In the third display method, when a guidance route including a twin roundabout is selected, a twin roundabout and a ring road constituting the twin roundabout are identified with reference to map data, whereby the own vehicle is determined from the twin roundabout. When approaching range, display a map containing the entire twin roundabout. Then, according to the movement of the vehicle position, the vehicle mark is moved on the map.

  As described above, according to the roundabout display method according to the embodiment of the present invention, in a roundabout in which two circular roads share a node or a part of a link and are connected to each other, each of the roundabouts is configured. Identification information is assigned to each circular road so that the circular roads can be individually identified and stored as road data.

  Thereby, each circular path can be individually read based on the identification information. Then, in each read-out circular road, if the nodes and links that include the shared node or the shared link are traced in order from the entry node to the circular road, the circular road You can go around the road and return to the first node. Accordingly, since each circular path can be determined to be equivalent to the roundabout, it is possible to search for and display a specific circular path or all the circular paths constituting the roundabout.

(Ii) Twin Roundabout Display Method According to Another Embodiment of the Present Invention Next, a twin roundabout display method according to another embodiment of the present invention will be described.

  This twin roundabout display method differs from the twin roundabout display method in the following points. That is, in this twin roundabout display method, the twin roundabout is displayed corresponding to the position of the vehicle without setting the destination, and the vehicle in the guide route selected by setting the destination is displayed. This is different from the above-described twin roundabout display method in which the twin roundabout is displayed corresponding to the vehicle position.

  Accordingly, the twin roundabout display method is different from the twin roundabout display method in which the exit is determined in advance, in that the exit from the twin roundabout is not determined in advance. From this point, the above-described second and third display methods for displaying the entire ring road regardless of the presence or absence of the exit can be used as the twin roundabout display method according to another embodiment of the present invention. It is. In this case, the guidance route is not displayed.

  In addition, in this twin roundabout display method, first, it is necessary to identify a twin roundabout in which the own vehicle is or will be advanced among arbitrary twin roundabouts based on the own vehicle position. This is different from the twin roundabout display method described above in which the twin roundabout in which the host vehicle is or will advance by setting the destination is specified in advance.

  In this twin roundabout display method, in order to identify the twin roundabout in which the vehicle will travel or will proceed based on the vehicle position based on the vehicle position, links and nodes around the vehicle position Search for. As a result, when a link with an identification mark of roundabout link 1, 2, 3 is detected, the circular path including the link, the twin roundabout including the circular path, and another circular path constituting the twin roundabout Can be specified. In this case, if a plurality of twin roundabouts are detected toward the destination of the vehicle on the map, the moving direction of the vehicle is detected by a self-contained navigation sensor or the like, and the twin roundabouts are specified.

  As described above, according to another embodiment of the present invention, in a twin roundabout in which two circular roads share a part of a link and are connected, each circular road can be individually identified. The identification information of the roundabout links 1 and 2 is given to the links constituting each ring road, the identification information of the roundabout link 3 is given to the shared links, and stored as road data.

  Thereby, each circular path can be individually read based on the identification information. Then, in each read-out circular road, when the nodes and links that include the shared link are sequentially traced from the entry node to the circular road, the circular road is made a round. To return to the first node. Accordingly, since each circular path can be determined to be equivalent to the roundabout, it is possible to search for and display a specific circular path or all the circular paths constituting the roundabout.

  Although the present invention has been described in detail with the embodiments, the scope of the present invention is not limited to the examples specifically shown in the above embodiments, and the above embodiments within the scope of the present invention are not deviated. Variations in form are within the scope of this invention.

  For example, the display method of the present invention can be similarly applied to the second twin roundabout shown in FIG. 2B and the third twin roundabout shown in FIG.

  FIG. 4 shows an example of the data structure, but the present invention is not limited to this. In addition, when a destination is set and a twin roundabout is included in the guidance route, a twin roundabout in which the vehicle is traveling is displayed together with the vehicle, or the vehicle is In the method of displaying the twin roundabout together with the current vehicle when the twin roundabout is proceeding, any data structure storing identification information that can identify the twin roundabout is included in the scope of the present invention. .

It is a block diagram which shows the structure of the vehicle-mounted navigation apparatus which is embodiment of this invention. (A), (b) is a figure (the 1) shown about the twin roundabout which can be displayed by the vehicle-mounted navigation apparatus of this invention. It is FIG. (2) shown about the twin roundabout which can be displayed by the vehicle-mounted navigation apparatus of this invention. It is a figure shown about the data structure of the road layer in the vehicle-mounted navigation apparatus which is embodiment of this invention. It is a figure which shows the content of the data corresponding to the conventional link classification in order to compare with the content of the data corresponding to the link classification in the data structure of the road layer of FIG. It is a top view which shows the display screen about the 1st case of the 1st display method in the display apparatus with which the vehicle-mounted navigation apparatus which is embodiment of this invention was equipped. (A), (b), (c) is a top view which shows the display screen about the 2nd case of the 1st display method in the vehicle-mounted navigation apparatus which is embodiment of this invention. (A), (b) is a top view which shows the display screen about the 3rd case of the 1st display method in the vehicle-mounted navigation apparatus which is embodiment of this invention. (A), (b), (c) is a top view which shows the display screen about the 1st case of the 2nd display method in the vehicle-mounted navigation apparatus which is embodiment of this invention. (A), (b) is a top view which shows the display screen about the 2nd case of the 2nd display method in the vehicle-mounted navigation apparatus which is embodiment of this invention. It is a top view which shows the display screen about one case of the 3rd display method in the vehicle-mounted navigation apparatus which is embodiment of this invention.

Explanation of symbols

1 DVD drive 1a DVD-ROM
2 Operation unit 3 GPS receiver 4 Autonomous navigation sensor 5 Communication device 6 VICS receiver 7 Display device (display means)
8 Speaker 10 Car navigation device body 11 Buffer memory 12 Control unit (control means)
13 Map Drawing Unit 14 Operation Screen / Mark Generation Unit 15 Guidance Route Storage Unit 16 Guidance Route Drawing Unit 18 Audio Output Unit 19 Image Composition Unit 20 On-vehicle Navigation Device

Claims (10)

A vehicle-mounted navigation device that provides a roundabout display guidance in which two circular roads share a part and are connected,
Storage means for storing map data including identification information assigned to each circular path so that each circular path constituting the roundabout can be individually identified;
Display means for displaying guidance information;
The specific circular road corresponding to the specific identification code is read from the storage means, or all the circular roads constituting the roundabout including the specific circular road are read, and the specific circular road or all A vehicle-mounted navigation device comprising: control means for displaying the circular road on the display means. Having position detecting means for detecting the current position of the vehicle;
The control means is configured to detect the own vehicle based on the position information of the own vehicle detected by the position detecting means when the own vehicle enters the roundabout and travels on a ring road constituting the roundabout. The in-vehicle navigation device according to claim 1, wherein the annular road in which the vehicle exists is detected, and the identification information corresponding to the circular road is searched and specified. Having position detecting means for detecting the current position of the vehicle;
When the control means selects a guidance route including the roundabout based on the input destination, when the own vehicle enters the roundabout and travels on a circular road constituting the roundabout, The ring road where the vehicle is present is detected based on the position information of the vehicle detected by the position detecting means, and the identification information corresponding to the ring road is searched and specified. The in-vehicle navigation device according to claim 1. A roundabout display method in an in-vehicle navigation device that performs display guidance of a roundabout, in which two circular roads share a part and are connected,
Each circular path constituting the roundabout can be individually identified and given identification information to each circular path, and stored.
Read the specific circular road corresponding to the specific identification information, or read all the circular roads constituting the roundabout including the specific circular road,
The roundabout display method of displaying the read specific ring road or all the ring roads.   When the own vehicle enters the roundabout on the guidance route and travels through the circular road constituting the roundabout, the own vehicle exists and there is at least an exit of the own vehicle from the roundabout The roundabout display method according to claim 4, wherein a ring road is displayed.   6. The road map around the own vehicle is displayed in an enlarged manner when the own vehicle is present on a ring road other than the ring road where the exit of the own car from the roundabout is located. How to display the described roundabout.   6. The roundabout display method according to claim 4, wherein the ring road on which the host vehicle is present is sequentially displayed according to the progress of the host vehicle.   Any one of the circular road where the own vehicle exists or a road map around the own vehicle, and the roundabout constituted by the circular road and the surrounding map are divided and displayed on one screen. The roundabout display method according to any one of claims 4 to 7.   The roundabout display method according to any one of claims 4 to 8, wherein when displaying the circular road, information for identifying the circular road is displayed at the same time.   It has a plurality of branch roads connected to the ring road, and information for identifying the connection point is given to the connection point of the branch road and the ring road, and when displaying the ring road, 10. The roundabout display method according to claim 4, wherein information for identifying the connection point is displayed at the same time.

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