JP2005315715A - Navigation system and crossing enlarged view display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a navigation system for providing a crossing enlarged view in accordance with prior thinking of a driver even when the driver reroutes in displaying the crossing enlarged view in the neighborhood of a guide crossing, and to provide a crossing enlarged view display method. <P>SOLUTION: The navigation system does not change route display itself of the crossing enlarged view even when the driver reroutes on an off-road or the like by re-drawing only a new rerouted introduction route without eliminating the route of the crossing enlarged view displayed initially when the driver reroutes in displaying the crossing enlarged view in the neighborhood of a guide crossing. The navigation system provides the crossing enlarged view in accordance with the prior thinking of the driver grasping to see the crossing enlarged view before advancing to the guide crossing after rerouting to reduce trouble of the driver. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a navigation device and an enlarged intersection map display method, and more particularly, an enlarged intersection when the current position of a vehicle deviates from a guidance route near a guidance intersection or when a detour route is automatically searched near a guidance intersection. The present invention relates to a method for redisplaying a figure.

  In general, in-vehicle navigation devices detect the current position of a vehicle using a self-contained navigation sensor, a GPS (Global Positioning System) receiver, or the like, and read map data in the vicinity from the recording medium and display it on a screen. Then, the vehicle position mark indicating the vehicle position is superimposed and displayed at a predetermined location on the screen, so that it can be seen at a glance where the vehicle is currently traveling.

  A recent navigation apparatus can receive VICS road traffic information (hereinafter abbreviated as VICS information) sent from a road traffic information center (VICS center), and display a road condition that changes every moment on a navigation screen. There are many things that are. A navigation device equipped with a VICS function can provide road traffic information such as traffic jam information and regulation information to a user in real time.

  Also, most recent navigation devices are equipped with a route guidance function. This route guidance function automatically searches for the route with the lowest cost from the current location to the destination using map data, and uses the searched route as a guidance route to change the color of other roads on the map screen. draw. In addition, when the vehicle approaches a guidance intersection on the guidance route within a certain distance, an enlarged view of the intersection is displayed and the intersection is guided to guide the driver to the destination. Some navigation apparatuses equipped with such a route guidance function have a function of automatically re-searching a detour route that avoids traffic jams according to the received VICS information.

  By setting a guidance route using this route guidance function and traveling according to the guidance, it is possible to reliably reach the destination without knowing the road. However, even if you try to drive according to the guidance on the enlarged intersection map displayed near the guidance intersection, at a complicated guidance intersection, etc., you will not bend along the guidance and your vehicle will deviate from the guidance route. ”).

  As an example of a complex intersection, there is a roundabout (also known as a roundabout or a traffic circle) that is often found mainly in the West. As shown in FIG. 6, this landbout is configured by radially connecting a plurality of roads to be an approach road or an escape road to a closed ring road. In such a landbout, even if the guidance route RT is displayed in the enlarged view of the intersection, it is not easy to grasp the escape route and may pass through the escape route. In particular, as the number of roads radiating from the ring road increases, it becomes more difficult to grasp the escape route.

  When the vehicle is off-route, the route with the lowest cost connecting the current location immediately after the off-route to the destination is automatically re-searched (this is called “reroute”), and the newly set guidance route is displayed on the map screen. With other roads, the color is drawn thickly. When a reroute is performed in the vicinity of the guidance intersection, the enlarged intersection map up to that point, which has become useless, is once erased from the screen, and the enlarged intersection map generated according to the guidance route newly set by the reroute is displayed again.

  However, the enlarged view of the intersection is drawn so that the vehicle direction mark is always at the bottom of the screen and the traveling direction is up. Therefore, with respect to the intersection enlarged view (the state as shown in FIG. 6A in which the approach path is drawn downward) displayed immediately before entering the landabout, the intersection after the reroute is as shown in FIG. 6B. The direction of the enlarged map changes, and the appearance of the approach and exit paths in the enlarged map of the intersection changes completely before and after the reroute. Also, in the enlarged view of the intersection after the reroute, since the guidance route display is erased from the original approach route, it is not possible to know which approach route was.

  In the Landabout, it is in a complicated driving environment such as driving while turning along a ring road and judging multiple roads connected to the radiation, and it is necessary to go from the approach road to the escape road while changing lanes. It is necessary to travel while paying more attention to other traveling vehicles than general roads. When driving in such a complicated driving environment, if the appearance of the approach path and the escape path that were grasped by looking at the enlarged intersection map immediately before entering the landabout changes completely due to reroute, the driver Had to read the new information again on the screen while traveling in the Landabout, causing the driver to be confused.

  That is, when entering the landbout, many drivers grasp the positional relationship of the direction of the escape route (upper left in FIG. 6A) viewed from the point of entry. Also, if you go off-route, the driver will return to the Landbout approach and take a re-approach to the same exit. However, when the reroute is performed, the enlarged intersection map is rewritten, the positional relationship between the approach path and the exit path is changed, and there is no indication of which approach path. For this reason, the driver's original thought and the guidance contents according to the enlarged enlarged view of the intersection after the reroute are separated from each other, resulting in confusion for the driver. In addition, depending on the position of the vehicle, the new guidance route provided by the reroute may be changed from the first route, and the landing route of the landbout itself may change, resulting in further driver confusion. ing.

In addition, in order to make it easy to understand and accurately guide the escape route in the landabout, the direction of the route to the escape route is indicated by an arrow at each branch point existing between the approach route and the escape route. The technique made into this is proposed (for example, refer patent document 1). However, even with the technique described in Patent Document 1, if the escape route is passed through the landbout, the reroute is performed and the direction of the enlarged intersection is changed. is there.
JP 2001-336944 A

  The above problem is not limited to the case where the escape route is passed in the landabout. For example, at an adjacent intersection where a plurality of guided intersections are continuous within a predetermined distance, an enlarged intersection view as shown in FIG. 7A including the plurality of guided intersections is displayed. Also in this case, when the vehicle is off-route from the first guidance route RT as shown by the dotted line, the direction of the enlarged intersection view is changed as shown in FIG. 7B due to the reroute, which causes confusion for the driver. .

  In addition, even if the map is not actually off-routed and map matching cannot be performed well and the map data is off-routed, the re-route is performed and the direction of the enlarged intersection changes. It may end up. Furthermore, not only when the reroute is performed because of an off-route, but a detour route that avoids traffic congestion is automatically re-searched in the vicinity of the guidance intersection according to the VICS information (hereinafter also referred to as “reroute”). In some cases, the enlarged map of the intersection was rewritten by the reroute, which sometimes caused confusion for the driver.

When the vehicle position approaches the guidance intersection, a route from the road other than the guidance route existing between the vehicle position and the guidance intersection to the guidance route ahead of the guidance intersection is searched and searched. A technique has been proposed in which a circle mark is displayed on a road and a cross mark is displayed on a road that has not been searched, so that it is possible to determine whether or not the road can be bypassed without scrolling the map ( For example, see Patent Document 2). However, this has nothing to do with how to display the enlarged intersection map when an off-route or re-route occurs.
JP 2001-141480 A

The present invention has been made to solve such problems, and even when an off-route occurs when an enlarged view of an intersection is displayed near a guidance intersection, the driver's original thoughts can be obtained. The purpose is to provide an enlarged view of the intersection along the road.
The present invention also provides an enlarged view of the intersection in accordance with the driver's original thought without changing the escape route even when an off-route occurs when an enlarged view of the intersection is displayed at a complicated guidance intersection such as a landabout. It is also aimed to be able to provide.

  In order to solve the above-described problem, in the present invention, when an off-route occurs when an enlarged view of an intersection is displayed near a guidance intersection, the route of the initially displayed enlarged view of the intersection is not erased, and after the off-route. Also, the route of the intersection enlarged view is displayed. When rerouting is performed in response to the occurrence of an off-route or a traffic jam, only the rerouted new guidance route is redrawn on the route in the original enlarged intersection map.

  In another aspect of the present invention, when the guidance intersection is a landabout, a guide route with the lowest cost connecting from the current location of the vehicle to the destination via the escape route before the reroute process is performed is searched by reroute. Alternatively, when the guidance intersection is a landabout, the reroute process is not performed even if an off route occurs.

  According to the present invention configured as described above, even if a reroute is performed due to the occurrence of an off route or a traffic jam, the route display itself in the enlarged view of the intersection does not change. It is possible to continue traveling according to the original thought that was grasped by looking at the enlarged intersection view before entering the vehicle, and the driver's confusion can be reduced.

  According to another feature of the present invention, when the guidance intersection is a landabout, not only the route display of the intersection enlarged view but also the original escape route does not change, so the driver can enlarge the intersection before entering the guidance intersection. It is possible to continue traveling toward the escape route originally grasped in accordance with the original thought grasped by looking at the figure, and the driver's confusion can be further reduced.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration example of the navigation device according to the present embodiment. In FIG. 1, reference numeral 100 denotes a navigation control device, which controls the entire navigation device. Reference numeral 11 denotes a recording medium such as a DVD-ROM, which stores various types of map data necessary for map display, route search, and the like. Here, the DVD-ROM 11 is used as a recording medium for storing the map data, but other recording media such as a CD-ROM and a hard disk may be used.

  Here, the details of the map data recorded on the DVD-ROM 11 will be described. The map data recorded on the DVD-ROM 11 is managed in a hierarchical manner in units called levels, from a high-level map for overlooking a wide area to a low-level map describing a narrow area in detail. Each level is divided in units of rectangular areas called sections partitioned by predetermined longitude and latitude. The map data of each section can be specified and read by specifying the section number.

  The map data for each section includes a drawing unit composed of various data necessary for map display, a road unit composed of data necessary for various processes such as map matching, route search, route guidance, and detailed data on intersections. And an intersection unit consisting of.

  The above-mentioned road unit corresponds to data relating to a node corresponding to a point where a plurality of roads intersect such as an intersection or a branch, and a road or a lane that connects a node on the road and another node adjacent thereto. Data about links. That is, in this road unit, a connection node table storing detailed data of all nodes, a node table indicating the storage position of the connection node table, and a link storing detailed data of links specified by two adjacent nodes A record and a link table indicating the storage position of the link record are included.

  FIG. 2 is a diagram showing detailed contents of various tables included in the road unit. Here, only data particularly related to the present embodiment is shown. Moreover, the example of the image of the node near a landbout and a link is shown collectively.

  As shown in FIG. 2, the node table stores node records # 0, # 1, # 2,... Corresponding to all nodes included in the partition of interest. Each node record is given a node number in ascending order from # 0 in the order of arrangement, and this node number indicates the storage position of the connection node table corresponding to each node.

  The connection node table stores connection link number records # 0, # 1, # 2,... For each existing node. This connection link number record indicates the link number of each link whose node is one end as many as the number of connected links.

  Further, the link table stores link records # 0, # 1, # 2,... Corresponding to all links included in the focused section. Each link record is given an ascending link number from # 0 in the arrangement order, and this link number indicates the storage position of the link record corresponding to each link.

  The link record stores information such as a link ID, a node number, and a traffic flag. The link ID indicates a code attached to each link mainly for displaying a searched route. The node number indicates a number that identifies two nodes located at both ends of the link, and is used when expressing the direction of the link. The traffic flag indicates various attributes related to the link in several bits. Setting the corresponding bit to ON sets the attribute of whether or not the link is part of a complex intersection area such as a landbout. can do.

  In the example of FIG. 2, the link 1 connected to the landabout does not have a complex intersection area attribute added by a traffic flag. On the other hand, the link 2 constituting a part of the landbout has a complex intersection area attribute added by a traffic flag. Here, the explanation is given taking a landbout as an example, but the present invention is not limited to this. For example, for any link that does not want to change the enlarged view of the intersection before and after the reroute, such as a nearby intersection where multiple intersections continue within a predetermined distance, five or more complicated intersections where five or more roads intersect in a complex manner It is possible to add complex intersection area attributes. When a complex intersection area attribute is added to an intersection other than the landabout, the landabout attribute is added to the landabout.

  Returning to FIG. 1, reference numeral 12 denotes a VICS receiver, which performs two-way communication with radio wave beacon transceivers mainly installed on a highway via radio waves and is mainly installed on main trunk roads. By performing two-way communication with a beacon transceiver via light, VICS road traffic information sent from the VICS center is received. The VICS receiver 12 receives VICS road traffic information sent from the VICS center via FM broadcast radio waves. The received VICS road traffic information is output to the navigation control device 100.

  Reference numeral 13 denotes an operation unit such as a remote control, a touch panel, or an operation switch. The user sets various types of information (for example, a route guidance destination or waypoint) to the navigation control device 100, or performs various operations (for example, Menu selection operation, enlargement / reduction operation, manual map scrolling, numerical input, etc.).

  Reference numeral 14 denotes a self-contained navigation sensor for measuring the current position of the vehicle, a distance sensor (vehicle speed sensor) 14a for detecting a moving distance of the vehicle by outputting one pulse for each predetermined traveling distance, and a rotation angle of the vehicle. And an angular velocity sensor (relative azimuth sensor) 14b such as a vibration gyro for detecting (moving azimuth). The self-contained navigation sensor 14 detects the relative position and direction of the vehicle by the distance sensor 14a and the angular velocity sensor 14b, and outputs the information to the navigation control device 100.

  Reference numeral 15 denotes a GPS receiver for measuring the current position of the vehicle. The GPS antenna 16 receives radio waves transmitted from a plurality of GPS satellites, and performs a three-dimensional positioning process or a two-dimensional positioning process to obtain the absolute position of the vehicle. The position and direction are calculated (the vehicle direction is calculated based on the current vehicle position and the current vehicle position one sampling time ΔT before). Then, the calculated information on the absolute position and direction of the vehicle is output to the navigation control device 100 together with the positioning time.

  Reference numeral 17 denotes an image display device that displays an image generated by the control of the navigation control device 100. On the screen of the image display device 17, a predetermined range of map information including the vehicle position is displayed together with the vehicle position mark and the like. Further, when a guidance route is set, the guidance route is displayed on this map, and when the position of the vehicle approaches the guidance intersection, an enlarged view of the intersection is displayed.

  Next, in the internal configuration of the navigation control apparatus 100, reference numeral 21 denotes a map buffer, which temporarily stores map data read from the DVD-ROM 11. A ROM read control unit 22 controls reading of map data from the DVD-ROM 11. The ROM reading control unit 22 inputs vehicle current position information after the map matching process from a map matching control unit 27 described later. Then, an instruction to read out a predetermined range of map data including the current vehicle position is output. Thereby, the map data necessary for the map display is read from the DVD-ROM 11 and stored in the map buffer 21.

  Reference numeral 23 denotes a VICS information buffer for sequentially storing VICS road traffic information output from the VICS receiver 12. An external signal input unit 24 inputs an operation signal corresponding to the operation state from the operation unit 13. Reference numeral 25 denotes a vehicle position / orientation calculation unit, which calculates an absolute vehicle position (estimated vehicle position) and vehicle direction based on data on the relative position and direction of the vehicle output from the autonomous navigation sensor 14. To do. A data storage unit 26 sequentially stores the absolute position and direction data of the vehicle output from the GPS receiver 15.

  The map matching control unit 27 described above includes the map data read into the map buffer 21, the estimated vehicle position and vehicle direction data based on the autonomous navigation sensor 14 calculated by the vehicle position / orientation calculation unit 25, and data Using the vehicle position data and the vehicle orientation data from the GPS receiver 15 stored in the storage unit 26, map matching processing by a projection method or the like is performed for each vehicle travel distance, and the travel position of the vehicle is determined as map data. Correct the position on the road.

  Reference numeral 28 denotes a guidance route control unit, which uses the map data stored in the map buffer 21 to search for the guidance route with the lowest cost connecting the current location to the destination. A guidance route memory 29 stores guidance route data (a set of nodes from the current location to the destination) set by the guidance route control unit 28. When there is a landbout on this guidance route, the node data stored in the guidance route memory 29 includes the node # 20 at the connection point between the link 1 corresponding to the approach route to the landbout shown in FIG. The information of the node # 21 at the connection point between the link 8 corresponding to the escape route from the landabout and the landabout is included.

  The guidance route control unit 28 is an off-route in which the current position of the vehicle deviates from the guidance route based on the vehicle position information output from the map matching control unit 27 and the guidance route data stored in the guidance route memory 29. It is determined whether or not (including a case where map matching is not successful and the route is deviated from the guidance route) has occurred. When the occurrence of an off-route is detected, this is notified to an intersection guide unit 33 described later, and the lowest-cost guide route connecting the current location after the off-route to the destination is re-searched and set. Perform reroute processing. As described above, the guidance route control unit 28 constitutes the off-route determination unit according to claims 1 and 4 and the re-route unit according to claims 2 and 5.

  The guidance route control unit 28 also determines whether or not a traffic jam has occurred based on the VICS road traffic information stored in the VICS information buffer 23, and if so, to avoid the traffic jam. A reroute process for automatically searching and setting the detour route is also performed. When the reroute process for searching for such a detour route is performed, this is notified to the intersection guide unit 33 described later. Thus, the guidance route control unit 28 also constitutes a traffic jam detection unit and a reroute unit.

  A map drawing unit 30 generates map image data necessary for displaying a map on the image display device 17 based on the map data stored in the map buffer 21. Reference numeral 31 denotes a VRAM (video RAM), which temporarily stores map image data generated by the map drawing unit 30. Reference numeral 32 denotes a read control unit that controls reading of map image data from the VRAM 31. That is, the map image data generated by the map drawing unit 30 is temporarily stored in the VRAM 31, and the map image data for one screen is read by the read control unit 32.

  Reference numeral 33 denotes an intersection guide unit that performs intersection guidance based on the vehicle position information from the map matching control unit 27, the guidance route data from the guidance route memory 29, and the map data from the map buffer 21. For example, when the host vehicle approaches within a predetermined distance from a guidance intersection in front of the guidance route, the intersection enlarged view of the guidance intersection being approached based on the intersection enlarged view data of the intersection unit stored in the map buffer 21 Generate and output the image. This enlarged image of the intersection is an image of the vehicle position mark representing the vehicle position and the arrow mark representing the guidance route on the route representing the enlarged shape of the intersection represented by the intersection enlarged map data. It is.

  Reference numeral 34 denotes a VICS information generation unit which outputs the VICS road traffic information to the image composition unit 38 in order to display the VICS road traffic information stored in the VICS information buffer 23 on the image display device 17. An operation screen generator 35 generates and outputs an operation screen necessary for performing various operations using the operation unit 13. Reference numeral 36 denotes various mark generation units that generate and output a vehicle position mark displayed at the vehicle position after the map matching processing, various landmarks that display a gas station, a convenience store, and the like.

  A guidance route drawing unit 37 generates drawing data for the guidance route using the result of the route search process stored in the guidance route memory 29. That is, from the guidance route data stored in the guidance route memory 27, what is included in the map area drawn in the VRAM 31 at that time is selectively read out, and in a predetermined color different from other roads on the map image. Draws a boldly emphasized guide route.

  The above-described image composition unit 38 adds the intersection guide unit 33, the VICS information generation unit 34, the operation screen generation unit 35, the various mark generation unit 36, and the guidance route drawing unit 37 to the map image data read by the read control unit 32. Each of the image data output from each of the image data is overlapped to compose an image and output to the image display device 17. As a result, the synthesized image is displayed on the screen of the image display device 17.

  The above-described intersection guide unit 33 generates an off-route or a detour route from the guidance route control unit 28 when displaying an enlarged view of the intersection at the guidance intersection to which the complex intersection area attribute is added by the traffic flag of FIG. When the execution of the reroute is notified, the route of the enlarged intersection map that has been displayed so far is not deleted, and the new guidance route searched by the reroute is redrawn on the route of the enlarged intersection map. . Thus, the intersection guide part 33 constitutes an enlarged intersection drawing means of claims 1, 3, and 5.

  FIG. 3 is a diagram showing a change in the display of the enlarged intersection view when the reroute is performed after passing the escape route of the guidance route in the landabout. Among these, FIG. 3A shows a display immediately before entering the landabout, and FIG. 3B shows a display after reroute. Even if an off-route occurs and a re-route is performed while displaying an enlarged view of a roundabout intersection as shown in FIG. 3 (a), the intersection enlargement that has been displayed until then is displayed as shown in FIG. 3 (b). While maintaining the route in the figure, a new guidance route and a vehicle position mark searched by reroute are drawn on the route in the enlarged intersection view.

  As a result, the direction of the enlarged intersection map does not change at all before and after the reroute, and the appearance of the approach road and the escape road before the reroute does not change at all. Therefore, the driver can continue to travel according to the original thinking that he / she has grasped by looking at the enlarged view of the intersection before entering the landabout even after the reroute.

  When the reroute is performed due to an off-route occurring in the landabout, or when the detour route is rerouted based on the VICS road traffic information in the landabout, the guide route control unit 28 is configured to perform the reroute from the current location of the vehicle. It is preferable to search for a guide route with the lowest cost connecting the escape route to the destination. Since the node information of the escape route is stored in the guide route memory 29, the route information may be set as a waypoint and the reroute process may be performed.

  In this way, even if the road conditions from the current location to the destination at the time of the reroute are different (even if it is different from the situation when the guide route was initially set at the departure point), the original escape The road never changes. As a result, the driver can continue to drive toward the escape route that was originally grasped, following the original thought that was grasped by looking at the enlarged view of the intersection before entering the Landabout, even after reroute. The driver's confusion can be further reduced.

  FIG. 4 is a diagram showing a change in the display of the enlarged intersection view when an off-route occurs in a nearby intersection and a re-route is performed. Of these, FIG. 4 (a) shows the display immediately before entering the adjacent intersection, and FIG. 4 (b) shows the display after reroute. Even when an off-route occurs and a reroute is performed while an enlarged view of an intersection at an adjacent intersection is displayed as shown in FIG. 4 (a), it has been displayed until then as shown in FIG. 4 (b). While maintaining the route of the enlarged intersection map, the new guidance route and the vehicle position mark searched by the reroute are drawn on the route of the enlarged intersection map.

  In this case as well, the direction of the enlarged intersection map does not change at all before and after the reroute, so the driver will continue to follow the original thought that he / she knew by looking at the enlarged intersection map before entering the adjacent intersection. You can continue to do so, and you wo n’t be confused.

  FIG. 5 is a flowchart showing the display operation of the enlarged intersection view by the navigation device of the present embodiment. In FIG. 5, the guide route control unit 28 determines whether or not an off route has occurred (step S1). If no off-route has occurred, it is determined whether or not a traffic jam has been detected based on the VICS road traffic information stored in the VICS information buffer 23 (step S2). If neither off-route nor traffic jam is detected, the process is terminated. On the other hand, when an off route or a traffic jam is detected, the reroute processing described below is performed.

  When an off route or a traffic jam is detected, the guidance route control unit 28 at that time generates the current vehicle position information generated by the map matching control unit 27 and the traffic flag included in the map data stored in the map buffer 21. Based on the above, it is determined whether or not the current position is within an intersection with a complex intersection area attribute (step S3). When the off-route or the point where the traffic jam is detected is not within the complex intersection area, the guidance route control unit 28 performs a re-route process (step S4).

  In the reroute process in step S4, the guide route with the lowest cost connecting the current location to the destination at the time when the off route or the traffic jam is detected is searched and set. When reroute is performed in response to detection of a traffic jam, a detour route that avoids the traffic jam section can be searched by applying a higher weight than usual to the link of the traffic jam section. Then, the new guidance route set by the reroute is drawn on the map.

  Next, the guidance route control unit 28 determines whether or not the point where the off route or the traffic jam is detected is within the guidance intersection or within a predetermined distance from the guidance intersection (step S5). If it is not within the guidance intersection or the like, the enlarged view of the intersection is not originally displayed, so the processing is terminated. On the other hand, when the point where the off route or the traffic jam is detected is in the guidance intersection or the like, the guidance route control unit 28 notifies the intersection guidance unit 33 of the fact. The intersection guide unit 33 once erases the currently displayed enlarged intersection from the screen (step S6), and then redisplays the new enlarged intersection according to the new guidance route set by the reroute (step S7).

  If it is determined in step S3 that the point where the off-route or traffic jam is detected is within the complex intersection area, the guidance route control unit 28 determines whether or not the intersection is a landabout based on the traffic flag in the map data. Is further determined (step S8). If it is a landabout, the original escape route is set as a transit point (step S9), and reroute processing is performed (step S10). If it is not a landabout, a reroute process is performed without setting a waypoint (step S10).

  In the reroute processing in step S10, when the off-route or the point where the traffic jam is detected is not the landabout, the guide route with the lowest cost connecting the current location to the destination is searched and set. When the off-route or the point where the traffic jam is detected is a landabout, a guide route with the lowest cost connecting from the current location to the destination via the original escape route is searched and set.

  Next, the guidance route control unit 28 determines whether or not the point where the off route or the traffic jam is detected is within the guidance intersection or within a predetermined distance from the guidance intersection (step S11). If it is not within the guidance intersection or the like, the enlarged view of the intersection is not originally displayed, so the processing is terminated. On the other hand, when the point where the off route or the traffic jam is detected is in the guidance intersection or the like, the guidance route control unit 28 notifies the intersection guidance unit 33 of the fact. Even when the reroute is performed in step S10, the intersection guide unit 33 does not delete the route of the enlarged intersection map being displayed from the screen, but only the new guide route set by the reroute is displayed on the route of the enlarged intersection map. Is displayed again (step S12).

  As described above in detail, according to the present embodiment, when rerouting is performed when an enlarged intersection map is displayed in the vicinity of the guidance intersection, the route of the initially displayed enlarged intersection map is not deleted, and a new rerouted route is displayed. Since only the guide route is redrawn, the route display itself in the enlarged intersection view does not change even if the reroute is performed. As a result, even after reroute, it is possible to provide an enlarged view of the intersection in line with the driver's original thought that was grasped by looking at the enlarged view of the intersection before entering the guidance intersection, thereby reducing driver confusion. be able to.

  Further, in this embodiment, when the guidance intersection is a landabout, the route with the lowest cost that connects the current route of the vehicle to the destination via the escape route before the reroute process is performed is searched by reroute. Therefore, after the reroute, not only the route display of the enlarged intersection view but also the original escape route can be kept unchanged. Thereby, a driver | operator's confusion can be further reduced.

  In the above-described embodiment, when an off-route occurs in the landbout, an example is described in which reroute is performed by setting the original escape route as a transit point. However, re-route is performed when an off-route occurs in the landbout. You may make it not. Even in this way, it is possible to never change the escape route before and after the off route, and it is possible to provide an enlarged view of the intersection along the driver's original thought.

  As described above, whether or not the guidance intersection when the occurrence of the off-route is detected is a landabout can be determined by checking whether or not the landabout attribute is added to the traffic flag shown in FIG. This determination is performed by, for example, the guidance route control unit 28 that monitors the occurrence of an off-route, and notifies the intersection guidance unit 33 whether the off-route has occurred and the guidance intersection at which the off-route has occurred is a roundabout. In this case, the guidance route control unit 28 constitutes a roundabout determination unit.

  In addition, each of the above-described embodiments is merely an example of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed in a limited manner. In other words, the present invention can be implemented in various forms without departing from the spirit or main features thereof.

  INDUSTRIAL APPLICABILITY The present invention is useful for a navigation device that performs intersection guidance by displaying an enlarged view of an intersection when a vehicle approaches a guidance intersection on a guidance route within a certain distance.

It is a block diagram which shows the structural example of the navigation apparatus by this embodiment. It is a figure which shows the detailed content of the various tables contained in the road unit of map data. It is a figure which shows the change of the display of the intersection enlarged view by this embodiment when it reroutes by carrying out off-route within a landabout. It is a figure which shows the change of the display of the intersection enlarged view by this embodiment when it reroutes by carrying out off-route within the adjacent intersection. It is a flowchart which shows the display operation | movement of the intersection enlarged view by the navigation apparatus of this embodiment. It is a figure which shows the change of the display of the intersection enlarged view by a prior art example when it reroutes by carrying out off-route within a landabout. It is a figure which shows the change of a display of the intersection enlarged view by a prior art example when it reroutes by carrying out off-route within the adjacent intersection.

Explanation of symbols

11 DVD-ROM
12 VICS receiver 17 Image display device 21 Map buffer 23 VICS information buffer 27 Map matching control unit 28 Guide route control unit 29 Guide route memory 33 Intersection guide unit

Claims (10)

A navigation device that displays an enlarged view of an intersection when a vehicle approaches a guidance intersection on a guidance route and performs intersection guidance,
Off-route determination means for determining whether or not an off-route has occurred where the vehicle deviates from the guidance route;
When the off-route determination means detects the occurrence of the off-route while the enlarged view of the intersection is displayed, the route of the enlarged view of the intersection displayed before the occurrence of the off-route is turned off. A navigation apparatus, comprising: an enlarged intersection drawing drawing means for displaying even after a route is generated. Re-route means for performing re-route processing for re-searching and setting a guide route with the lowest cost connecting from the current location after the off-route to the destination when the occurrence of the off-route is detected by the off-route determination means; Prepared,
If the reroute processing is performed by the reroute means when the intersection enlarged view is displayed, the intersection enlarged view drawing means displays the intersection enlarged view displayed before the reroute processing is performed. A navigation device characterized by redrawing the guidance route searched by the reroute means on a route. A navigation device that displays an enlarged view of an intersection and guides the intersection when a vehicle approaches a guidance intersection on a guidance route,
A traffic jam detection means for detecting traffic jam based on road traffic information received when the guide route is set;
A reroute means for performing a reroute process for automatically searching and setting a detour route with the lowest cost connecting the current location to the destination when the traffic jam is detected by the traffic jam detection means;
When the reroute processing is performed by the reroute means when the intersection enlarged view is displayed, the reroute means is on the route of the intersection enlarged view displayed before the reroute processing is performed. An intersection enlarged view drawing means for redrawing the searched guidance route. When the guidance intersection is a landabout and the vehicle is in the landabout, the reroute means has the most cost to connect from the current location of the vehicle to the destination via the escape route before the reroute processing is performed. The navigation device according to claim 2, wherein the navigation device searches for a small guide route. A navigation device that displays an enlarged view of an intersection and guides the intersection when a vehicle approaches a guidance intersection on a guidance route,
Off-route determination means for determining whether or not an off-route has occurred where the vehicle deviates from the guidance route;
A landbout determination unit for determining whether or not the guidance intersection where the off-route has occurred is a landbout when the off-route determination unit detects the occurrence of the off-route;
When it is determined that the guidance intersection is not a landabout by the landabout determining means, a reroute process for re-searching and setting a guide route with the lowest cost connecting from the current location after the off-route to the destination is performed, and the above-mentioned landabout determination is performed. When it is determined by the means that the guidance intersection is a landabout, a reroute means that does not perform the reroute processing;
When the reroute processing is performed by the reroute means, the intersection enlargement for redrawing the guidance route searched by the reroute means on the route of the intersection enlarged view displayed before the reroute processing is performed. A navigation apparatus comprising a drawing means. A first step of determining whether or not an off-route in which the vehicle deviates from the guidance route has occurred when the enlarged intersection view is displayed;
A second step of performing a reroute process for re-searching and setting a guide route with the lowest cost connecting from the current location after the off route to the destination when the occurrence of the off route is detected;
And a third step of redrawing the guidance route searched by the reroute processing on the route of the intersection enlarged view displayed before the reroute processing is performed. Method. When the guidance intersection is a landabout and the vehicle is in the landabout, the second step connects from the current location of the vehicle to the destination via the escape route before the reroute processing is performed. The intersection enlarged view display method according to claim 6, wherein a guide route with the lowest cost is searched. A first step of performing a reroute process for automatically searching and setting a detour route for avoiding traffic congestion in response to reception of road traffic information when a guide route is set;
A second step of determining whether or not the reroute processing is performed when the intersection enlarged view is displayed;
When the execution of the reroute process is detected, a third step of redrawing the guidance route searched by the reroute process on the route of the enlarged intersection view displayed before the reroute process is performed. A method for displaying an enlarged view of an intersection characterized by comprising: When the guidance intersection is a landabout and the vehicle is in the landabout, the first step is to connect from the current location of the vehicle to a destination via an escape route before the reroute process is performed. The intersection enlarged view display method according to claim 8, wherein a guide route with the lowest cost is searched. A first step of determining whether or not an off route has occurred in which the vehicle deviates from the guidance route;
A second step of determining whether or not the guidance intersection where the off-route has occurred is a landabout when the occurrence of the off-route is detected;
When it is determined that the guidance intersection is not a landabout, a third step of performing a reroute process for re-searching and setting a guide route with the smallest cost connecting the current location after the off-route to the destination;
When the reroute process is performed, a fourth step of redrawing the guidance route searched by the reroute process on the route of the enlarged intersection view displayed before the reroute process is performed; An intersection enlarged view display method characterized by comprising:

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