JP2010266389A - On-vehicle navigation system and route guidance display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle navigation system and route guidance display method, having a function of displaying a route guidance, capable of facilitating grasp of the outline of a route required by a user, even when a guidepath up to a destination is long and there are a large number of guide points. <P>SOLUTION: The on-vehicle navigation system includes display means; own-vehicle position detection means of detecting own-vehicle position; map data storage means of storing map information including information of roads and guide points; control means of searching for a guidepath from own-vehicle position to a destination; and storage means of storing a selection criterion for selecting a road or a guide point on the guidepath. The control means prepares simple guide data in which the number of roads and guide points on the guidepath have been reduced, based on the guidepath, map information and selection criterion and a simplified guidepath guidance according to simple guidance data, is displayed on a screen of the display means. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an in-vehicle navigation device and a route guidance display method having a route guidance display function for displaying the entire guidance route so that it can be easily grasped.

  Conventional typical vehicle-mounted navigation devices include a control device such as a CPU that controls all processes related to navigation, a storage device such as a DVD (Digital Versatile Disk) -ROM or an IC memory card that stores map data in advance, It has a display device, a GPS (Global Positioning System) receiver, a detection device for detecting the current position and current direction of the vehicle, such as a gyroscope and a vehicle speed sensor. Then, the control device reads out map data including the current position of the vehicle from the storage device, displays a map image around the vehicle position on the display device screen based on the map data, and indicates the current position of the host vehicle. The vehicle position mark to be displayed is superimposed on the map image, the map image is scrolled according to the movement of the vehicle, the map image is fixed on the screen and the vehicle position mark is moved, and where the vehicle is currently located. You can see at a glance whether you are driving.

  The in-vehicle navigation device is usually equipped with a function (route guidance function) for guiding the user so that the user can easily travel on the road without making a mistake. According to this route guidance function, a simulation such as a horizontal search method or a Dijkstra method is performed by the control device using the map data to find an optimal route from the departure point (typically the current position of the vehicle) to the destination. The search is performed by calculation, the searched route is stored as a guidance route, and the guidance route can be distinguished from other roads on the map image while traveling (for example, by changing the color or changing the line width). When the vehicle approaches a predetermined distance to the intersection where the course should be changed on the guide route, the guide map of the intersection (enlarged view of the intersection, progression at the intersection) By displaying an arrow indicating the direction, the distance to the intersection, the name of the intersection, etc., the user can know which road to travel and in which direction to proceed at the intersection. It has become.

  As a technique for making such a guidance route easy to understand, Patent Document 1 describes a technique for displaying not only a formal name of a road but also a common name of a road name familiar to a user.

JP 2008-298500 A

  As described above, when route guidance is performed while the vehicle is traveling based on information on the searched guidance route, an enlarged view is displayed for each guidance point such as an intersection, or a familiar name is displayed. Various techniques have been studied and implemented to display the information in an easy-to-understand manner for the user.

  On the other hand, the information on the entire guidance route (the whole process) can be confirmed by a route information guide map or a process guide map. In the route information guide map and the route guide map, guide points such as roads and facilities used from the current position of the host vehicle to the destination are displayed on the screen. For example, in the route information guide map, road names on the route from the vehicle position to the destination, intersection names for making a right turn or a left turn, and the like are displayed in order. In such a route information guide map, since the number of guide points that can be displayed on one screen is limited, guide points and the like at points ahead of the displayed point are displayed by scrolling the screen. In this way, by scrolling the screen and sequentially displaying the route information guidance, all the guidance points to the destination can be confirmed.

  However, when the distance to the destination is long and there are many guidance points on the route, it is troublesome and has to be scrolled many times to obtain information on all the guidance points. It is not easy to grasp the entire route.

  Further, there may be a case where the user does not need information on all guide points. For example, there may be a case where it is desired to know in detail the intersections that require attention in traveling, the vehicle position, and the vicinity of the destination.

  The present invention has been made in view of the problems of the prior art, and even when the guidance route to the destination is long distance and there are many guide points, an outline of the route required by the user is easy. It is an object of the present invention to provide an in-vehicle navigation device and a route guidance display method having a function of displaying route guidance that can be easily grasped.

  In order to solve the above-described problems of the prior art, according to the basic form of the present invention, map information including information on a display means, a vehicle position detection means for detecting the vehicle position, and road and guidance points is stored. Map data storage means, control means for searching for a guidance route from the vehicle position to the destination, and storage means for storing selection criteria for selecting roads or guidance points on the guidance route, The control means generates simplified guidance data in which roads and guidance points on the guidance route are reduced based on the guidance route, the map information, and the selection criteria, and simplified guidance route guidance according to the simplified guidance data. Is displayed on the screen of the display means.

  In the in-vehicle navigation device according to this aspect, the control means may select a road of a predetermined road type out of road types based on the selection criterion for selecting from a road on the guide route, The control means may be configured to select a road of a predetermined hierarchical level among road network hierarchical levels divided into a plurality of hierarchical levels based on the selection criterion for selecting a road from the road on the guidance route, The control means is a road on the guidance route based on the selection criteria for selecting a road and a guide point existing within a predetermined range from the vehicle position and a road and a guide point existing within a predetermined range from the destination. The control means may select a road existing at every predetermined distance on the guide route from the vehicle position. The road on the guide route may be selected based on a selection criterion, and the control unit selects a guide point on the guide route based on the selection criterion for selecting a guide point of a predetermined scale. You may do it.

  The in-vehicle navigation device according to this aspect further includes information input means for inputting information instructed by a user, and the control means provides the simplified guidance route guidance according to an instruction via the information input means. The control means may switch the selection criteria according to an instruction via the information input means, and the control means may determine the number of roads and guidance points on the guidance route. When the number is larger than the predetermined number, the simplified guidance route guidance may be displayed.

  According to another aspect of the present invention, the display means, the map data storage means storing the map information including the information of the road and the guidance point, and the selection criteria for selecting the road or the guidance point on the guide route are provided. A route guidance display method performed in a vehicle-mounted navigation device comprising stored storage means, the step of searching for a route to a specified destination, the searched guidance route, the map information, and the selection Generating simplified guidance data in which roads and guidance points on the guidance route are reduced based on a reference; and displaying simplified guidance route guidance on a screen of the display unit according to the simple guidance data. A route guidance display method characterized by the above is provided.

  In the route guidance display method according to this aspect, the step of generating the simple guidance data includes selecting a road of a predetermined road type from among road types as a selection criterion, Extracting a road for generating simple guidance data from roads on the guidance route according to the selection criterion, wherein the step of generating the simple guidance data includes a road network divided into a plurality of hierarchical levels. Selecting a road of a predetermined hierarchy level among the hierarchy levels from the roads on the guidance route, and extracting a road for generating simple guidance data from the roads on the guidance route according to the selection criteria And the step of generating the simplified guidance data includes a predetermined range from the vehicle position. Selecting a road and a guide point existing in the road and a guide point existing within a predetermined range from the destination from the road and the guide point on the guide route, and the guidance according to the selection criteria Extracting a simple guide data generation road and guide points from the road and guide points on the route, wherein the step of generating the simple guide data includes a predetermined distance on the route from the vehicle position. Selecting a road that exists every time from the roads on the guidance route, and extracting a road for generating simple guidance data from the roads on the guidance route according to the selection criteria. In the step of generating the simple guidance data, a guide point of a predetermined scale may be placed on the guide route. A step of the selection criteria to select from the guide point, extracting a guide point for the simple guidance data generated from the guidance points on the guidance route in accordance with the selection criteria may include a.

  According to the in-vehicle navigation device and the route guidance display method of the present invention, in the guidance route guidance information display, instead of using all the roads and guidance points of the searched guidance route as route guidance data, a predetermined guidance is provided. Simplified guidance data is generated using the roads and guidance points extracted under the selection criteria for selecting roads or guidance points on the route as route guidance data. As a result, even if the guide route is a long distance and there are many guide route guidance roads and guide points, only roads and guide points that satisfy certain conditions are used as route guide data. Compared to the case where the guidance point is route guidance data, the number is reduced, and the entire guidance route can be easily grasped in a short time.

It is a block diagram which shows the structure of the vehicle-mounted navigation apparatus which concerns on one Embodiment of this invention. It is a figure which shows an example of the route data of a guidance route. It is a figure which shows an example which applied the simple guidance route guidance which limited the road or the guidance point to the route guidance map by using the road classification as a selection criterion. It is a figure which shows an example which applied the simple guidance route guidance which limited the road or the guidance point to the process guide map by using the road classification as a selection criterion. It is a figure which shows an example of a road network hierarchy classification. It is a figure which shows an example which applied the simple guidance route guidance which limited the road or the guidance point to the route guidance map using the road network hierarchy classification as a selection criterion. It is a figure which shows an example which applied the simple guidance route guidance which limited the road or the guidance point to the route guide figure by using the road network hierarchy classification as a selection criterion. It is a flowchart (the 1) which shows an example of a simple guidance route guidance display process. It is a figure explaining the selection criteria of the road or guidance point for simple guidance route guidance. It is a figure which shows an example which applied the simple guidance route guidance limited by the selection criteria of a road or a guidance point to a route information guidance map. It is a flowchart (the 2) which shows an example of a simple guidance route guidance display process. It is a flowchart (the 3) which shows an example of a simple guidance route guidance display process. It is a flowchart (the 4) which shows an example of a simple guidance route guidance display process.

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

(1) 1st Embodiment (Structure of a vehicle-mounted navigation apparatus)
FIG. 1 is a block diagram showing a configuration of an in-vehicle navigation device 100 according to an embodiment of the present invention.

  In the figure, 1 is a DVD-ROM drive, and 1a is a storage medium in which map data and other guidance data are stored. In the present embodiment, the DVD-ROM 1a is used as a storage medium for storing such data, but a hard disk or other storage medium may be used. The map stored here is divided into longitude and latitude widths of appropriate sizes according to each scale level such as 1/1500, 1/25000, 1 / 50,000, 1/10000, etc. Roads, buildings, facilities, and other various properties included in are stored as a coordinate set of points (nodes) expressed in longitude and latitude. Map data includes (1) a road layer composed of road link data, intersection data, node data, etc., (2) a background layer for displaying roads, buildings, parks, rivers, etc. on a map image, and (3) a municipality. It consists of a character / symbol layer for displaying administrative division names such as names, road names, intersection names, characters, map symbols, and the like.

  In the road layer, the road link data supplies attribute information of each road. For each link constituting the road, the type of road (national road, highway, prefectural road, other road), hierarchization of the road network It consists of data such as the level, the number of nodes constituting the link, the road number (road name), and the width of the link connecting each node. The intersection data is a set of nodes closest to the intersection among the nodes on the link coupled to the intersection. The node data is a list of all nodes constituting the road, and includes position information for each node, information for identifying whether the node is an intersection or not, and the like.

  An operation unit 2 is provided with operation buttons and the like for operating the navigation apparatus body 10. In this embodiment, the operation unit 2 includes a remote control transmitter, and the user can also operate the navigation apparatus body 10 with the remote control transmitter at hand.

  Also, 3 receives GPS signals sent from a plurality of GPS satellites and generates and outputs GPS data such as longitude, latitude, PDOP (Position DOP) value and HDOP (Horizontal DOP) value of the current position of the vehicle. A GPS receiver is shown. 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 that detects a vehicle rotation angle, and a travel distance sensor that generates a pulse at every constant travel distance.

  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. These beacons are installed on the roadside and connected to police stations, road managers and integration centers to provide information on traffic jams in the vicinity.

  Reference numeral 7 denotes a display unit such as a liquid crystal panel. The navigation device body 10 displays a map around the current position of the vehicle on the display unit 7, a guidance route from the departure point to the destination, a vehicle mark, Other guidance information is displayed. The display unit 7 is provided with a touch panel on the screen, and is configured with various buttons paired with the display content of the display screen. The touch panel serves as an input device for selecting a menu or the like indicated by these various buttons. Reference numeral 8 denotes a speaker for providing guidance information to the user by voice.

  The navigation device body 10 is composed of the following. Reference numeral 11 denotes a buffer memory that temporarily stores map data read from the DVD-ROM 1 a via the DVD-ROM drive 1.

  Reference numeral 12 denotes a control unit constituted by a microcomputer. The control unit 12 has a built-in navigation program, and calculates the current position of the vehicle based on a signal output from the GPS receiver 3 or a signal output from the self-contained navigation sensor 4 according to the program. Or the map data to be displayed is read from the DVD-ROM 1a to the buffer memory 11 via the DVD-ROM drive 1 or from the departure place under the search conditions set using the map data read to the buffer memory 11. Various processes such as searching for a guidance route to the destination are executed. Further, as will be described later, roads and guide points according to a predetermined standard are extracted from roads and guide points on the searched guide route, and processing for simplifying guide route guidance is performed.

  13 is a map drawing unit for generating a map image using the map data read out to the buffer memory 11, and 14 is for generating various menu screens (operation screens) and various marks such as vehicle position marks and cursors according to the operation status. This is the operation screen / mark generator.

  Reference numeral 15 denotes a guide route storage unit that stores the guide route searched by the control unit 12, and 16 denotes a guide route drawing unit that draws the guide route. The guidance route storage unit 15 stores all the nodes of the guidance route searched by the control unit 12 from the departure point to the destination. When displaying the map, the guide route drawing unit 16 reads the guide route information from the guide route storage unit 15 and draws the guide route with a color and line width different from those of other roads.

  Reference numeral 17 denotes a storage unit composed of a hard disk or the like, which stores selection criteria for selecting roads and guide points for simplifying guidance route guidance to be described later. In addition, information for generating simplified guidance data for simplified guidance route guidance is temporarily stored.

  An audio output unit 18 supplies an audio signal to the speaker 8 based on a signal from the control unit 12. Reference numeral 19 denotes an image composition unit, which overlays the map image drawn by the map drawing unit 13 with various marks and operation screens generated by the operation screen / mark generation unit 14, the guide route drawn by the guide route drawing unit 22, and the like. Display on the display unit 7.

  In the in-vehicle navigation device 100 configured as described above, after the guidance route from the departure point to the destination is searched, simplified guidance data in which roads and guidance points on the guidance route are reduced based on information on the guidance route. And a simplified guidance route guide that makes it easy to grasp the entire guidance route is displayed. In the present embodiment, a case will be described in which guidance route guidance is displayed as a route guidance map or a travel guide map.

  The route guide map displays road names and guide points on the guidance route from the departure place to the destination in the order of proximity to the host vehicle. Since the number of guidance points and the like displayed on the screen is limited, a portion that is not displayed can be displayed by scrolling the screen. In this way, it is possible to grasp the entire process of the guide route by scrolling the screen. In addition, the itinerary map is a list of road names from the vehicle position to the destination in order of the guide route, and a point name that identifies a point on the guide route or a road name that exists ahead of the vehicle position. It is the figure which has arranged a plurality of display frames in order from near to the own vehicle position.

(Tiering of guidance route information)
In the first embodiment, in order to simplify the information displayed in the guidance route guidance, the route information of the guidance route is hierarchized to classify roads and the like, and the road to be guided is specified by specifying the hierarchization level. The number of etc. is reduced.

  A road type is used as an object of stratification. The road types are classified into “highway” and “general road”, and “general road” is further classified into “national road”, “prefectural road”, “city road”, and “other general roads”. These road types are defined in the road layer of the map data stored in the DVD-ROM (map data storage means) 1a.

  FIG. 2 shows an example of route data of the guide route. This route data is acquired from the guide route storage unit 15 in which the result of searching for the guide route is stored. The road information constituting the guide route includes distance, road name, road type, and hierarchy level.

  FIG. 2A shows an example in which all road types of roads are selected from the guide route, and all roads constituting the guide route are extracted. In this way, the hierarchy level when all road types are targeted is “normal”.

  FIG. 2B shows the route data of “highway” extracted from the route data of FIG. Thus, the hierarchy level when the road type is “highway” is set to “simple”. As the “simple” level, “highway” and “national road” may be targeted, or the “simple” level may be defined in a plurality of stages.

  In the normal route guide map, the route data of FIG. 2A having the hierarchy level “normal” is used to display the guide route guide from the departure point to the destination. On the other hand, when the hierarchy level is designated as “simple”, only the “highway” is extracted from the roads on the guide route, and the destination is more than in the case of all the road types in FIG. The number of route information is reduced.

  FIG. 3 is a diagram showing an example of the route guidance screen 31. The route guidance screen 31 includes a route guidance display area 33 for displaying a guidance route and an auxiliary information display area 34 for displaying auxiliary information regarding roads and guidance points. Further, the hierarchy information of the displayed route is displayed at the hierarchy level 32.

  FIG. 3A shows a route guidance screen when the hierarchy level is “normal”, and FIG. 3B shows a route guidance screen when the hierarchy level is “simple”. The route guidance screen displays the roads and guidance points on the guidance route from the departure point S to the destination G in order from the nearest vehicle. In the route guidance screens of FIGS. 3A and 3B, six roads or guidance points are displayed at one time. By operating the scroll bar 36, guidance points at other points are displayed. be able to.

  In FIG. 3A, six roads or guide points after the LS4 line in the guidance route are displayed in the route guidance display area 33. Further, the auxiliary information display area 34 displays the number of roads to be traveled and the estimated arrival time at the guidance point.

  The guidance route guidance in FIG. 3A shows that the vehicle reaches the interchange entrance A at 12:25 after traveling 0.5 km on LS4 and 0.5 km on NR5. The auxiliary symbol 35a indicates that the entrance A is an interchange entrance, and the auxiliary symbol 35b indicates that the A20 exit is a junction.

  The road names (LS4, NR5, EW1 high speed, and EW2 high speed) displayed in the route guidance display area 33 in FIG. 3A are based on the normal route data in FIG.

  In FIG. 3B, only the roads with the road type “highway” among the guidance routes are displayed as route information. The road names (EW1 high speed to EW6 high speed) displayed in the route guidance display area 33 in FIG. 3B are based on the simplified route data in FIG.

  By displaying the guidance route information based on the simplified route data in this way, the number of information displayed in the route guidance display area 33 is reduced, and the number of times the screen of the route guidance display area 33 is scrolled is reduced. It is possible to easily check the entire route.

  FIGS. 4A and 4B show examples of a process guide map screen and a map screen based on route data.

  As shown in FIGS. 4A and 4B, a map around the vehicle position is displayed on one screen (map display screen 41a) of the screen divided into two, and the other screen (stroke guide diagram screen 41b) is displayed. The process guide diagram is displayed. The hierarchy information of the route displayed on the process guide map screen 41 b is displayed at the hierarchy level 42.

  The point name display frames 43a to 43c are arranged so as to cross the road display representing the route, and the road name and the guidance point name are entered in the point name display frames 43a to 43c in order from the own vehicle position and displayed. ing. In addition, information such as the distance between points, estimated arrival time, and facilities in the SA in the case of an expressway are displayed in the point name display frame or adjacent to the point name display frame.

  On the process guide map screen 41b in FIG. 4A, a process guide map having a hierarchy level “normal” corresponding to the route guide map in FIG. 3A is displayed. “NR5”, “EW1 high speed entrance”, and “Exit A” are displayed in the point name display frames 43a to 43c of the process guide map, respectively. In addition, the point name display frames 43a to 43c indicate that 0.5 km to the NR5 line is 0.5 km from the NR5 line to the EW1 high-speed entrance, and 4.0 km from the EW1 high-speed entrance to the exit A. Yes.

  On the process guide map screen 41b in FIG. 4B, a process guide map having a level “simple” corresponding to the route map in FIG. 3B is displayed. "EW1 high speed entrance", "EW2 high speed JCT", and "EW3 high speed" are displayed in the point name display frames 43a to 43c of the process guide diagram, respectively. In this way, in the simplified route guide diagram at the hierarchical level, the information on the expressway is displayed in the point name display frame. Each point name display frame 43a to 43c indicates that the distance from the EW1 high speed entrance is 10.2km, the EW1 high speed entrance to the EW2 high speed JCT is 4.0km, and the EW2 high speed JCT to the EW3 high speed is 5.0km. It is displayed.

  In addition, in the process guide figure of Fig.4 (a) and (b), although the three point name display frames are shown, it is not restricted to this. For example, the number of point name display frames may be increased according to the size of the screen.

  In this way, by displaying the process guide map based on the simplified route data, the number of roads and the like guided on the guide route is reduced, and the process guide to be performed when confirming the entire guide route is confirmed. Since the number of times the figure screen is scrolled is reduced, the entire route can be easily confirmed.

  The selection criteria for simplification of the guide route information are not limited to the hierarchization based on the road type. For example, as another example of simplification by hierarchization, it is possible to use a hierarchy level of a road network used for calculating a guidance route.

  FIG. 5 is a diagram showing an example of hierarchization of a road network. The road network is hierarchized from a lower level 0 to an upper level 3, and a road to be searched is set in each level. For example, the highest level hierarchization level 3 includes a highway and a national road having a number of digits of 1 to 2 digits, and the hierarchization level 2 includes a national road other than the national road of the hierarchy level 3. Further, the hierarchized level 1 includes local roads, and the level 0 includes other general roads. Other ordinary roads include fine roads such as narrow streets.

  In the road network data, one or more links, which are the minimum units expressing the road shape, are represented by a continuous link string and stored in the road layer of the map data.

  For example, in the normal level route information guidance, the roads of all the hierarchies from the hierarchy level 0 to the hierarchy level 3 and all the main points are targeted for guidance, and the simple guidance guides the roads of the hierarchy level 2 and the hierarchy level 3 Target only, or target only for roads in level 3. In the following description, the simple level is provided in two stages, the simple 1 guidance object is a hierarchy level 2 and hierarchy level 3 road, and the simple 2 guidance object is a hierarchy level 3 road.

  FIG. 6 shows an example of a route guidance screen when the hierarchization level of the road network is used as a selection criterion for simplification of guidance route guidance. FIG. 6A shows a case where the hierarchy level is “normal”, and the level 0 to level 3 and the guidance points of the road network hierarchy are targeted for guidance. In this case, the route guidance screen for the road data in FIG. 2 is the same as the route guidance screen in FIG.

  FIG. 6B shows a case where the hierarchical level is set to simple 1, and the level 2 and level 3 of the road network hierarchy are targeted for guidance. In this case, only the national road and the expressway are displayed in the route guidance display area 33 of the route guidance screen 31, and the scroll operation by the scroll bar 36 for confirming the entire guidance route can be performed in a short time.

  FIG. 6C shows a case where the hierarchy level is set to simple 2, and only level 3 of the road network hierarchy is targeted for guidance. In this case, only the expressway is displayed in the route guidance display area 33 of the route guidance screen 31, and the entire guidance route can be confirmed in a shorter time.

  FIGS. 7A to 7C are a route guide map screen and a map screen based on route data, and the route guide map corresponds to the route guide maps of FIGS. 6A to 6C. . FIG. 7A is the same as FIG.

  FIG. 7B corresponds to the route guide map of FIG. 6B and is a display at a hierarchical level simplified to simple one. “NR1” is displayed in the point name display frame 43a of the travel guide map, “NR2” is displayed in the point name display frame 43b, and “NR5” is displayed in the point name display frame 43c.

  In addition, the point name display frames 43a to 43c indicate that 0.5 km to the NR1 line, 1.0 km from the NR1 line to the NR2 line, and 2.0 km from the NR2 line to the NR5 line. .

  FIG. 7C corresponds to the route guide map of FIG. 6C, and is a display at a hierarchical level simplified to simple 2. FIG. “EW1 high speed” is displayed in the point name display frame 43a, “EW2 high speed” is displayed in the point name display frame 43b, and “EW3 high speed” is displayed in the point name display frame 43c.

  The point name display frames 43a to 43c indicate that 10.2 km from the EW1 high speed, 4.0 km from the EW1 high speed to the EW2 high speed, and 5.0 km from the EW2 high speed to the EW3 high speed.

  As described above, there are two types of route information hierarchies for simplifying the display of guidance route guidance, when the road type is used as a selection criterion and when the road network hierarchy level is used as a selection criterion. . It may be possible to specify which of these two types of selection criteria is used and to switch the selection criteria. For example, in a menu screen (not shown) for selecting guidance route guidance display, a selection button for selecting a criterion for hierarchizing route information is prepared, and simple guidance for displaying simple guidance route guidance according to the selected criterion. Try to create data.

  Even if the route information hierarchization standard is not designated, when the simplified guidance route guidance display is selected, the simplified guidance route guidance display according to the predetermined criterion is performed. Do. On the guidance route guidance display screen, a selection button for selecting a criterion for hierarchizing route information is prepared so that any criterion can be displayed.

  Further, when the display of the guidance route guidance is selected, even if the display of the simple guidance route guidance is not selected, the simple guidance route guidance may be automatically displayed. For example, when the number of roads and guidance points on the searched guidance route exceeds a preset number, the simple bath hall route guidance is automatically displayed. It is also possible to switch between the display of simple guidance route guidance and the display of normal guidance route guidance. When you get an overview of the guidance route by displaying the simple guidance route guidance, if you want to see more detailed route guidance, switch to the normal guidance route guidance display based on the displayed point (road) and confirm Can do.

  Next, the simple guidance route guidance display process which the control part 12 of the vehicle-mounted navigation apparatus 100 performs is demonstrated with reference to the flowchart of FIG. FIG. 8 is a flowchart illustrating an example of a simplified guidance route guidance display process using hierarchical data of guidance route information.

  First, in step S11 of FIG. 8, a guidance route is searched. A recommended route from the current position of the host vehicle to the designated destination is searched, and the search result is stored in the guidance route storage unit 15.

  In the next step S12, the vehicle position is detected. The own vehicle position is calculated as an absolute coordinate based on a signal (GPS information) from the GPS receiver 3. In addition, based on the detection result input from the self-contained navigation sensor 4, the vehicle position as a relative position, which is a change from the vehicle position immediately before, is calculated. When displaying the process guide map, a road map around the vehicle position is displayed on the map screen. On the road map, the vehicle position mark and the guidance route are synthesized and displayed.

  In the next step S 13, route data is extracted from the guidance route storage unit 15 and temporarily stored in the storage unit 17. The guide route storage unit 15 stores route data of the guide route as a result of the search in step S11.

  In the next step S14, a route information layer reference is acquired. As a standard for hierarchizing route information, hierarchization by rank of road type and hierarchization by hierarchy level of a road network are defined. Which hierarchy is used as a reference is determined by a user instruction via the operation unit 22.

  Note that even when there is no user instruction, when there is an instruction for simple guidance route guidance display, a predetermined route information hierarchization criterion (for example, road type) may be used.

  In addition, even if there is no instruction for simple guidance route guidance display, if the number of roads and guidance points used on the guidance route exceeds a predetermined number, simple guidance route guidance information may be displayed. Good.

  In the next step S15, specific route data corresponding to the route information hierarchization standard is extracted from the route data and stored in the storage unit 17 as route information data.

  In the next step S16, a route guide map after the vehicle position is displayed based on the route information data.

  As described above, according to the in-vehicle navigation device and the route guidance display method of the present embodiment, in the display of the guidance route guidance information, instead of using all the roads and guidance points of the searched guidance route as route guidance data. In addition, simple guidance data is generated using the roads and guidance points extracted under the selection criteria for selecting roads or guidance points on a predetermined guide route as route guidance data. As a result, even if the guide route is a long distance and there are many guide route guidance roads and guide points, only roads and guide points that satisfy certain conditions are used as route guide data. Compared to the case where the guidance point is route guidance data, the number is reduced, and the entire guidance route can be easily grasped in a short time.

(2) Second Embodiment In the second embodiment, the number of roads or guide points displayed in the simplified guidance route guidance is reduced according to a standard different from the simplification of guidance route data using hierarchization of road data. Except for this point, the second embodiment is the same as the first embodiment.

  9A to 9C are diagrams for explaining selection criteria for simplifying route information. FIGS. 9A to 9C show an example in which a guidance route from the vehicle position CM to the destination G has been searched.

  9A to 9C show an example in which the guidance route GR to the destination G is searched and the guidance route GR from the vehicle position CM to the destination G is displayed. A road (R1 to R8) on the guidance route GR from the destination to the destination G is displayed. In addition, intersections (IS1 to IS8) that are guide points on the guidance route GR are displayed.

  FIG. 9A shows an example in which the selection criteria for simplifying route information are limited to roads existing around the vehicle position and around the destination. It is conceivable that the user confirms in advance a point to be noted in traveling by route guidance. In that case, if the guide route GR is a long distance, the number of points of caution increases and it becomes difficult to grasp all of the points of caution. By limiting to the range close to the vehicle position and the range close to the destination, the displayed road names and the number of guide points can be reduced, and the attention point can be easily grasped.

  The designated range PCA around the host vehicle position and the designated range GOA around the destination can be set as appropriate, so that the designated range PCA around the host vehicle position and the designated range GOA around the destination are different. May be.

  FIG. 9B is an example in which the selection criteria for simplifying the route information is limited to roads that exist at every predetermined distance on the guidance route GR from the vehicle position CM. A road at a predetermined distance, for example, every 10 km (P1 to P11) from the vehicle position CM is displayed as guidance information.

  This predetermined distance is determined in advance. Further, the predetermined distance may be determined according to the total distance number of the guide route GR. For example, when the total distance number of the guidance route GR is 500 km or more, the predetermined distance may be 50 km, or when the total distance number is 100 km or less, the predetermined distance may be 10 km.

  FIG. 9C is an example in which the selection criteria for simplifying the route information is limited to intersections where the scale of the intersections (IS1 to IS8) existing on the guidance route GR is a predetermined scale. As the size of the intersection, for example, an intersection having four or more roads connected to the intersection, a case where the width of the road connected to the intersection is wider than a predetermined width, or an intersection with a large amount of traffic.

  Note that FIG. 9 used in the description of the selection criteria for simplifying the route information is an example of the guide route GR, and the number of roads and guide points on the guide route GR increases as the distance to the destination increases. . In that case, the number of scrolls of the display screen can be reduced as compared with the normal route guidance display by limiting the road names and the like to be displayed in the route guidance based on the selection criteria.

  FIGS. 10A to 10C show examples of route guidance screens on which roads or guidance points selected by the route information simplification selection criteria of FIGS. 9A to 9C are displayed. The route guide map can also be simply displayed in the same manner as the route guidance screen by using the road or the guidance point selected according to the selection criteria for simplifying the route information.

  FIG. 10A is a diagram showing an example of a route guidance screen when the selection criteria for simplifying route information in FIG. 9A is used. As shown in FIG. 10 (a), in the route guidance display area 33, road names and intersection names (R1, IS1, R2, IS2, R3) in the designated range PCA around the vehicle position and designated range GOA around the destination are displayed. The road name (R7) is displayed.

  By such a limitation, the scroll amount on the route guidance screen is almost constant until the designated range PCA around the vehicle position and the designated range GOA around the destination overlap, and the information on the guidance route GR is grasped with a small scroll amount. It becomes possible to do.

  FIG. 10B is a diagram showing an example of a route guidance screen when the selection criteria for simplifying the route information of FIG. 9B is used. As shown in FIG. 10 (b), road names (R2, R3, R3, R5, R6, R6) of points (P1 to P6) at predetermined distances from the vehicle position CM are displayed in the route guidance display area 33. Has been. Since the roads at the points P5 and P6 are both R6, R6 is displayed continuously in FIG. 10B, but only one is displayed when the road names are the same. May be.

  FIG. 10C is a diagram showing an example of a route guidance screen when using the route information simplification selection criteria of FIG. 9C. As shown in FIG. 10C, a predetermined scale (IS5, IS6 and IS7 in FIG. 10C) is displayed in the route guidance display area 33 among the intersections ahead of the vehicle position CM.

  You may enable it to designate which selection criterion is used as the selection criterion for simplifying route information as described above. For example, in a menu screen (not shown) for selecting a route guidance screen, a button for specifying a selection criterion for simple guidance route guidance is prepared, and simple route guidance for simple guidance route guidance according to the designated criterion. Create data.

  Even when the selection criterion is not specified, when the simple guidance route guidance display is selected, the simple guidance route guidance display is performed according to a predetermined selection criterion. Then, a button for designating a selection criterion is prepared on the display screen of the simple guidance route guidance so that any standard can be displayed.

  Next, the simple guidance route guidance display process will be described with reference to FIGS.

  FIG. 11 is a flowchart showing an example of a simplified guidance route guidance display process when the selection criterion for route information simplification is a road at a predetermined distance around the vehicle position and the destination. It is assumed that a criterion for selecting roads and guide points that are within a predetermined range from the vehicle position and within a predetermined range from the destination is selected as the selection criterion.

  First, in step S21 in FIG. 11, a guidance route is searched. A recommended route from the current position of the host vehicle to the designated destination is searched, and the search result is stored in the guidance route storage unit 15.

  In the next step S22, the vehicle position is detected. The own vehicle position is calculated as an absolute coordinate based on a signal from the GPS receiver 3. In addition, based on the detection result input from the self-contained navigation sensor 4, the vehicle position as a relative position, which is a change from the vehicle position immediately before, is calculated.

  In the next step S 23, route data is extracted from the guidance route storage unit 15 and temporarily stored in the storage unit 17. The guide route storage unit 15 stores route data of the guide route as a result of the search in step S21.

  In the next step S24, a road within a predetermined range on the route from the vehicle position (current location surrounding simple guide route) is extracted from the guide route temporarily stored in the storage unit 17.

  In the next step S 25, a road within a predetermined range on the route from the destination (a simple route around the destination) is extracted from the guidance route temporarily stored in the storage unit 17.

  In the next step S26, the current location surrounding simple guide route and the destination surrounding simple guide route are stored in the storage unit 17 as route information data.

  In the next step S27, a route guide map after the vehicle position is displayed based on the route information data.

  By the above simple guidance route guidance display processing, only roads or guidance points within a predetermined range on the guidance route around the vehicle position and the destination are displayed as route guidance.

  FIG. 12 is a flowchart showing an example of a simplified guidance display process in the case where the selection criteria for route information simplification are limited to roads at a predetermined distance from the vehicle position. In addition, the reference | standard made into the road which exists for every predetermined distance from the own vehicle position shall be selected as a selection reference | standard.

  Steps S31 to S33 in FIG. 12 are the same as steps S21 to S23 in FIG.

  In the next step S 34, points (simple guidance points) at predetermined distances on the route from the vehicle position are extracted from the guidance route temporarily stored in the storage unit 17.

  In the next step S35, the simple guide point is stored in the storage unit 17 as route information data.

  In the next step S36, a route guide map after the vehicle position is displayed based on the route information data.

  By the simple guidance route guidance display processing described above, only the roads on the guidance route for each predetermined distance from the vehicle position are displayed as route guidance. Note that the predetermined distance may be changed as appropriate.

  FIG. 13 is a flowchart showing an example of simple guidance display processing when the selection criteria for simplifying route information is limited to intersections (guide points) of a predetermined scale. It is assumed that a criterion limited to an intersection of a predetermined scale is selected as the selection criterion.

  Steps S41 to S43 in FIG. 13 are the same as steps S21 to S23 in FIG.

  In the next step S44, an intersection (simple guide point) of a predetermined scale is extracted from the intersections on the route.

  In the next step S45, specific route data corresponding to the hierarchization standard is extracted from the route data from the guide route temporarily stored in the storage unit 17 and stored in the storage unit 17 as route information data.

  In the next step S46, a route information guide map after the vehicle position is displayed based on the route information data.

  By the simple guidance route guidance display processing described above, only intersections of a predetermined scale such as intersections with a large number of connections on the guidance route are displayed as route guidance. In the present process, an intersection has been described as an example of a guide point. However, the present invention is not limited to an intersection, and a point with a large amount of traffic may be designated.

  As described above, according to the in-vehicle navigation device and the route guidance display method of the second embodiment, the guidance route guidance information is displayed as in the in-vehicle navigation device and the route guidance display method of the first embodiment. In the above, instead of using all the roads and guidance points of the searched guidance route as route guidance data, the roads and guidance points extracted under the selection criteria for selecting a road or guidance point on a predetermined guidance route Simple guidance data is generated using route guidance data. As a result, even if the guide route is a long distance and there are many guide route guidance roads and guide points, only roads and guide points that satisfy certain conditions are used as route guide data. Compared to the case where the guidance point is route guidance data, the number is reduced, and the entire guidance route can be easily grasped in a short time.

  The selection criteria are limited to roads around the vehicle position and the destination, limited to roads at a predetermined distance, or limited to intersections (guide points) of a predetermined scale. Thereby, it becomes possible for the user to acquire information on guide points that are necessary on the guidance route. For example, if the guide point to be displayed is designated as a large-scale intersection, it is possible to know how much of the entire guidance route exists and to check the attention point before traveling.

100: In-vehicle navigation device,
1a ... DVD-ROM (map data storage means),
2 ... operation part (information input means),
3 ... GPS receiver,
4 ... Self-contained navigation sensor,
7: Display section (display means),
10 ... navigation device body,
11: Buffer memory (map data storage means),
12 ... Control part (control means),
15 ... guide route storage unit,
16 ... guide route drawing unit,
17 ... Storage part (storage means),
31 ... Route guidance screen,
41b ... It is a process guide figure screen.

Claims (20)

Display means;
Own vehicle position detecting means for detecting the own vehicle position;
Map data storage means storing map information including road and guide point information;
Control means for searching for a guidance route from the vehicle position to the destination;
Storage means storing selection criteria for selecting roads or guidance points on the guidance route;
Have
The control means generates simplified guidance data in which roads and guidance points on the guidance route are reduced based on the guidance route, the map information, and the selection criteria, and simplified guidance route guidance according to the simplified guidance data. Is displayed on the screen of the display means.   The in-vehicle navigation device according to claim 1, wherein the control unit selects a road of a predetermined road type among road types based on the selection criteria for selecting a road on the guidance route.   The control means selects a road of a predetermined hierarchy level among road network hierarchy levels divided into a plurality of hierarchy levels based on the selection criteria for selecting a road from the road on the guide route. The in-vehicle navigation device according to Item 1.   The control means is a road on the guidance route based on the selection criteria for selecting a road and a guide point existing within a predetermined range from the vehicle position and a road and a guide point existing within a predetermined range from the destination. The vehicle-mounted navigation device according to claim 1, wherein a navigation point is selected.   The said control means selects the road on the said guidance route based on the said selection criteria which selects the road which exists for every predetermined distance on the guidance route from the own vehicle position, The said control means selects the road on the said guidance route based on the said selection criteria. Car navigation system.   The in-vehicle navigation device according to claim 1, wherein the control unit selects a guide point on the guidance route based on the selection criterion for selecting a guide point of a predetermined scale. Furthermore, an information input means for inputting information instructed by the user is provided,
The in-vehicle navigation device according to claim 1, wherein the control means displays the simplified guidance route guidance according to an instruction via the information input means.   The in-vehicle navigation device according to claim 7, wherein the control unit switches the selection criterion according to an instruction via the information input unit.   The in-vehicle navigation device according to claim 7, wherein the control means displays the simplified guidance route guidance when the number of roads and guidance points on the guidance route is greater than a predetermined number.   The guidance route guidance is displayed as a route guide map that displays roads and guide points from the vehicle position to the destination or a route guide map that displays the roads and guide points arranged linearly in the order of travel of the vehicle. The in-vehicle navigation device according to claim 1. A vehicle-mounted navigation device comprising: display means; map data storage means storing map information including road and guide point information; and storage means storing selection criteria for selecting roads or guide points on the guide route The route guidance display method performed in
Searching for a route to a specified destination;
Generating simple guidance data in which roads and guidance points on the guidance route are reduced based on the searched guidance route, the map information, and the selection criteria;
Displaying simplified guidance route guidance on the screen of the display means according to the simplified guidance data;
A route guidance display method characterized by comprising: The step of generating the simple guidance data includes selecting a road of a predetermined road type from among road types as a selection criterion,
Extracting a road for simple guidance data generation from roads on the guidance route according to the selection criteria;
The route guidance display method according to claim 11, further comprising: The step of generating the simple guidance data includes selecting a road of a predetermined hierarchical level from roads on the guide route among road network hierarchical levels divided into a plurality of hierarchical levels.
Extracting a road for simple guidance data generation from roads on the guidance route according to the selection criteria;
The route guidance display method according to claim 11, further comprising: The step of generating the simple guidance data includes roads and guide points existing within a predetermined range from the vehicle position and roads and guide points existing within a predetermined range from the destination. A step based on selection criteria of selecting from,
Extracting roads and guidance points for simple guidance data generation from roads and guidance points on the guidance route according to the selection criteria;
The route guidance display method according to claim 11, further comprising: The step of generating the simple guidance data includes selecting a road that exists at a predetermined distance on the route from the position of the vehicle from the road on the guidance route as a selection criterion;
Extracting a road for simple guidance data generation from roads on the guidance route according to the selection criteria;
The route guidance display method according to claim 11, further comprising: The step of generating the simple guidance data includes selecting a guide point of a predetermined scale from the guide points on the guidance route as a selection criterion;
Extracting guide points for generating simple guide data from guide points on the guide route according to the selection criteria;
The route guidance display method according to claim 11, further comprising: Before the step of displaying the route guidance information,
Receiving a simplified instruction route guidance display instruction via an information input means for inputting information instructed by a user;
When there is an instruction to display the simplified guidance route guidance, the simplified guidance data is used as guidance route guidance display data; and
The route guidance display method according to claim 11, further comprising: Furthermore, via the information input means, obtaining a selection criterion for generating the simple guidance data;
Generating the simplified guidance data according to the instructed selection criteria;
18. The route guidance display method according to claim 17, further comprising: And calculating the number of roads and guidance points on the guidance route;
When the calculated number is greater than a predetermined number, the simplified guidance data is used as display data for the guidance route guidance;
18. The route guidance display method according to claim 17, further comprising:   The guidance route guidance is displayed as a route guide map that displays roads and guide points from the vehicle position to the destination or a route guide map that displays the roads and guide points arranged linearly in the order of travel of the vehicle. The route guidance display method according to claim 11, wherein:

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