JP2009270886A - On-vehicle navigation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle navigation device capable of displaying information of an attention guide point on a guide route, intelligibly to a user. <P>SOLUTION: This on-vehicle navigation device having a function for searching for a guide route including an attention point to a destination, and guiding a vehicle along the guide route, has a display means, a storage means for storing map data, one's own vehicle position detection means for detecting a present position of the own vehicle, and a control means for generating simplified map data acquired by extracting and compressing map data of the periphery of each attention point on the guide route from the storage means. When receiving an instruction for displaying a simplified map of the periphery of an attention point, the control means halves a screen of the display means into an upper screen and a lower screen, displays a discrimination number for discriminating an attention point and a simplified map image of the periphery of the attention point on the upper screen, and displays a map image of the periphery of the present position of the own vehicle on the lower screen. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an in-vehicle navigation device that guides a vehicle to a destination according to a guidance route, and more particularly to an in-vehicle navigation device that can easily grasp a guidance point (attention point) to be noted on a guidance route.

  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, and the map image is scrolled according to the movement of the vehicle, or the map image is fixed on the screen and the vehicle position mark is moved to show where the vehicle is currently located. You can see at a glance whether you are driving.

  In-vehicle navigation devices are usually equipped with a function (route guidance function) that guides the user so that the user can easily travel on the road without making a mistake. According to this route guidance function, the CPU calculates the optimal route from the departure point (typically the current position of the vehicle) to the destination using map data, such as a horizontal search method or a Dijkstra method. The route searched is stored as a guide route, and the route can be distinguished from other roads on the map image while traveling (for example, the color is changed or the line width is increased). Display), and the user can grasp which road should be traveled.

  When searching for a route, the user sets a destination in advance, and sets a waypoint on the way to the destination as necessary. If necessary, various conditions (whether toll road priority or general road priority) are also set. In the navigation device, a plurality of routes to the destination are searched based on these set data, and the searched routes are displayed in different colors, for example, according to one route selected by the user. Give guidance.

  In such a navigation device, various guidance route guidance methods have been studied and put into practical use so that the traveling direction of the host vehicle can be easily confirmed and the vehicle can travel safely. For example, when the vehicle approaches a predetermined distance to the intersection where the course should be changed on the guidance route, a guide map of the intersection on the map image (an enlarged view of the intersection, an arrow indicating the traveling direction at the intersection, to the intersection) To display the distance, intersection name, etc.). In addition, a bird's-eye view is displayed so that the map can be seen far away, and more map information is provided than in the case of two-dimensional display, making it easier to check the direction of travel.

As a technique related to this, in Patent Document 1, a map around the vehicle position is displayed at a normal scale, a map ahead of the vehicle position is reduced in the vertical direction, and information about the vehicle position is displayed. A navigation device for displaying details is described.
JP 2002-98538 A

  As described above, it is possible to assist safe driving by displaying the vicinity of the host vehicle in detail or displaying a guide map of an intersection (referred to as a guide point) whose course on the guidance route should be changed. is there.

  However, since a guide map of such a guide point is displayed when approaching a predetermined distance to that guide point, the route around the guide point is determined when approaching the guide point. It will be understood for the first time. Therefore, in the case of roads where guide points intersect in a complicated manner, even if a guide map is displayed, it is difficult to grasp the road conditions in a short time, and it is not possible to travel with a margin, which may hinder safe driving. There is a risk of it coming. In addition, it is not easy to know how many guide points are before the arrival at the destination, and a sense of security cannot be obtained, which hinders comfortable driving.

  The present invention has been made in view of the problems of the prior art, and an object of the present invention is to provide an in-vehicle navigation device capable of easily displaying information on guidance points to be noted on a guidance route to a user. To do.

  In order to solve the above-described problems of the prior art, according to the basic form of the present invention, a vehicle-mounted device having a function of searching for a guidance route including a caution point to a destination and guiding a vehicle along the guidance route. A navigation device comprising: display means; storage means for storing map data; own vehicle position detecting means for detecting a current position of the own vehicle; and map data around each attention point on the guidance route. Control means for generating simple map data extracted from the storage means and compressed, and when the control means is instructed to display a simple map around the attention point, the control means The screen is divided into an upper screen and a lower screen, an identification number for identifying the attention point and a simplified map image around the attention point are displayed on the upper screen, and the vehicle's own vehicle is displayed on the lower screen. Vehicle navigation apparatus, characterized in that for displaying a map image around standing position is provided.

  In the in-vehicle navigation device according to this aspect, the control means displays the simplified map image in a simplified route display area associated with the attention point, and according to the instructed size of the simplified route display area, You may make it display the simple map image which made the compression degree small as the size was expanded.

  Further, in the in-vehicle navigation device according to this aspect, the control means extracts map data around the attention point extracted from the guidance route, and assigns the identification numbers to the map data in order from the destination. The control means may display the simplified route display area corresponding to the attention point to which the specified identification number among the identification numbers is assigned on the upper screen.

  Furthermore, in the vehicle-mounted navigation device according to this aspect, the control means may display an identification number of the caution point on the lower screen when the host vehicle is traveling around the caution point. The control means may display a link bar associated with all the attention points on the upper screen, and the number of the attention points between the position of the host vehicle and the destination is adjacent to the link bar. You may make it display.

  According to the in-vehicle navigation device of the present invention, when searching for a guidance route, the control unit extracts a caution point such as an intersection instructed to turn left or right on the guidance route, and information on the caution point (the caution point information). The position, the number of points of caution, and the location of the point of caution, and the simplified map data around the point of caution are generated. When there is an instruction to display a simple map around the attention point, the screen is divided into two parts, and the upper screen displays a compressed map (guidance route) around the attention point. A map image around the vehicle position is displayed.

  In the upper screen, the total number of attention points is displayed as an initial screen together with link bars associated with all the attention points. In addition, a simplified map around the specified attention point is displayed, and an outline of the guidance route is displayed. Thus, by displaying the total number of caution points, the driver can know in advance how many caution points exist up to the destination. In addition, it is possible to grasp where the attention point is on the guidance route, and it is possible to grasp the road condition of the attention point in advance.

  As a result, it is possible to prevent the driver from driving according to the road condition at the caution point immediately after approaching the caution point, thereby contributing to safe driving. In addition, by knowing in advance where the caution point exists to the destination, the driver can feel safer than when driving without knowing the presence of the caution point, and contribute to comfortable driving. Can do.

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

(Configuration of in-vehicle navigation system)
FIG. 1 is a block diagram showing a configuration of an in-vehicle navigation device 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 a road list, a node table, an intersection configuration node list, etc., (2) a background layer for displaying roads, buildings, parks, rivers, etc. on a map image, (3) It consists of a character / symbol layer or the like for displaying a letter indicating a administrative division name such as a municipality name, a road name, an intersection name, or a map symbol.

  The DVD-ROM 1a stores road data representing the shape of the road used for map matching. This road data is composed of a shape node and a link between shape nodes having different distances between nodes according to the shape of the road.

  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 device such as a liquid crystal panel. The navigation device main body 10 displays a map around the current position of the vehicle on the display device 7, guide routes from the departure point to the destination, vehicle marks, Other guidance information is displayed. The display device 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 a submenu displayed by touching an “attention point link bar”, which will be described later, and an input device for changing the display area for the “simple travel route display screen”. 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. In addition, as described later, attention points on the guidance route are extracted, simplified map image data in which a map image around the attention points is compressed is generated, and attention point information data associated with the attention points is generated. In response to an instruction to display a simple map around the attention point, the screen of the display device 7 is divided into two upper and lower screens to display a map around the designated attention point.

  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 compressed map data obtained by compressing a map around the attention point, information on the number of attention points, and the like.

  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 device 7.

  Simplified display of attention points on the guidance route in the vehicle-mounted navigation device 100 configured as described above will be described with reference to FIGS. FIG. 2 shows an initial screen of the caution point simplified display, and FIG. 3 shows a caution point simplified display screen on which the simplified travel route is displayed. FIG. 4 shows a caution point simplified display screen in which the simplified travel route is enlarged and displayed. In the following description, the “attention point” is a guide point such as an intersection that makes a right or left turn or a branch point of a Y-junction as a result of searching for a guidance route by specifying a destination. The points that the driver should pay attention to are shown.

  When the route search to the designated destination is performed, the control unit 12 of the in-vehicle navigation device 100 extracts the attention points on the guidance route from the guidance route storage unit 15 and information on the number and position of the attention points. To get. For each attention point, the map data around it is extracted from the DVD-ROM 1a, and compressed map data compressed to a predetermined degree of compression is generated. Then, for each attention point, “attention point information data” in which an identification number indicating the attention point is associated with the compressed map data around the attention point is created and stored in the storage unit 17.

  The identification number indicating the caution point is assigned in order from the destination to the departure point so that the passing order of the caution point can be understood.

  When a user such as a driver gives an instruction to display a caution point simply by selecting “Caution Point Simplified Display” (not shown) from a menu on the screen of the display device 7, for example, FIG. The initial screen of “Caution point simplified display” is displayed. In this initial screen, the screen 20 of the display device 7 is vertically divided into an upper screen 21 and a lower screen 22.

  An attention point link bar 23 is displayed on the upper screen 21, and the number of attention points on the guidance route is displayed in the attention point number display area 24 adjacent to the attention point link bar 23. In FIG. 2A, “9” is displayed as the number of caution points, indicating that there are nine caution points from the vehicle position to the destination. In the attention point number display area 24, the total number of attention points is displayed when the own vehicle is located at the departure point, and the number is reduced by one each time the own vehicle passes the attention point. The The attention point link bar 23 is a symbol indicating that it is associated with “attention point information data” (such as the position of the attention point and its surrounding map data) regarding all the attention points on the guidance route.

  On the other hand, on the lower screen 22, the vehicle position mark CM is fixed and displayed at the lower center of the lower screen 22, and a map image that scrolls as the vehicle moves is displayed. In FIG. 2A, for simplification of explanation, the display of facilities and the like is omitted, and only the guide route 25, the attention point A, and other roads are displayed. In addition, an attention point identification number is displayed in the attention point number display area 26 at the lower right of the lower screen 22 so that it can be understood which attention point the host vehicle is driving.

  In addition, since the information regarding the caution point is displayed on the upper screen 21, it is also referred to as “attention point screen”, and the lower screen 22 displays a map image at a user-specified scale including the vehicle position. For this reason, it is also called a “map screen”.

  When the user touches the attention point link bar 23 shown in FIG. 2A, a submenu 27 as shown in FIG. 2B is displayed. The submenu 27 includes a simple travel route display (1), a simple travel route display (2), and a simple travel route display (3). The numbers (1) to (3) indicate the number of “simple travel route display screens” (simple route display areas). The “simple travel route display” corresponding to the number indicated in the selected submenu 27 is displayed. Screen "is displayed.

  FIG. 3A shows an attention point simplified display screen on which a simplified travel route is displayed when the simplified travel route display (3) is selected from the submenu 27 shown in FIG. 2B. As shown in FIG. 3A, the caution point screen 21 spreads in the vertical direction as compared with FIGS. 2A and 2B, and accordingly the map screen 22 becomes narrower in the vertical direction. .

  On the simplified travel route display screens 31a to 31c, the guidance route around the attention point is displayed in a vertically compressed manner. Further, the identification number of the attention point is displayed in the area on the right side of the simplified travel route display screens 31a to 31c. FIG. 3A shows an example in which a guidance route around the attention points with the identification numbers 7, 8, and 9 is displayed. The simplified travel route display screens 31 a to 31 c are displayed in a color different from that of the map screen 22.

  In addition, a scroll bar 32 is displayed on the right side of the caution point screen 21, and the caution point developed as a simplified travel route display screen indicates which part of the entire caution point. By tracing the scroll bar 32 with a finger or the like, it is possible to display a simplified travel route display screen of caution points according to the touched position.

  In the simplified travel route display screen shown in FIG. 3A, the guide route compressed in the vertical direction is displayed, and the identification numbers of the caution points are continuously displayed as “7”, “8”, “9”. If there is, the guidance route between the simplified travel route display screens is also continuously displayed. In this simplified travel route display screen, compressed map data created based on map data extracted so that the guidance route between successive attention points is not interrupted is used for the map around the attention points.

  FIG. 3B shows another example of the guide route displayed on the simplified travel route display screen. In FIG. 3B, a guidance route and a road near the attention point are displayed. In this simplified travel route display screen, a map around the attention point is created based on the map data in the range of 600m in the vertical direction, for example, centering on the attention point, with the traveling direction of the host vehicle being the vertical direction of the screen. Using compressed map data.

  Thus, by displaying the compressed guide route on the simplified travel route display screen, it is possible to grasp the outline of the guide route. Also, as shown in FIG. 3B, the guidance route near the attention point is displayed, so that it is possible to confirm in advance what kind of intersection the attention point is.

  FIG. 4 shows a screen when the display area is changed with respect to the simplified travel route display screen of FIGS. 3 (a) and 3 (b). FIG. 4 shows the result of designating the simplified travel route display screen 31b to increase the screen size. The simplified travel route display screen 31b extends in the vertical direction and displays a map image including the guidance route 42 around the attention point B with a reduced degree of compression. Even when the guide route is displayed on the simplified travel route display screen 31b as shown in FIG. 3A, the road map and the guide route near the attention point B are displayed by enlarging the display area. . In this way, the screen is enlarged or reduced by an operation such as tracing the simplified travel route display screen in the vertical direction. For example, the attention point screen 21 can be expanded to ½ of the height of the entire screen. Along with this, the height of the map screen 22 is reduced to ½ of the entire screen. Further, when the size of the simplified travel route display screen is changed, a map image having a degree of compression corresponding to the size is displayed. That is, as the size is increased, a simplified map image around the attention point with reduced compression is displayed.

  In FIG. 4, the simplified travel route display screen 31 b is enlarged so that the simplified travel route display screen 31 c is hidden, and the identification number of the attention point is displayed on the right side of the simplified travel route display screen. Yes.

  As described above, according to the in-vehicle navigation device of the present embodiment, when searching for a guidance route, the control unit extracts a caution point such as an intersection instructed to turn left or right on the guidance route, and the caution. Information about the point (the position of the caution point, whether the caution point is at the destination, the simplified map data around the caution point, etc.) is generated. When there is an instruction to display a simple map around the attention point, the screen is divided into two parts, and the upper screen displays a compressed map (guidance route) around the attention point. A map image around the vehicle position is displayed.

  In the upper screen, the total number of attention points is displayed as an initial screen together with link bars associated with all the attention points. In addition, a simplified map around the specified attention point is displayed, and an outline of the guidance route is displayed. Thus, by displaying the total number of caution points, the driver can know in advance how many caution points exist up to the destination. In addition, it is possible to grasp where the attention point is on the guidance route, and it is possible to grasp the road condition of the attention point in advance.

  As a result, it is possible to prevent the driver from driving according to the road condition at the caution point immediately after approaching the caution point, thereby contributing to safe driving. In addition, by knowing in advance where the caution point exists to the destination, the driver can feel safer than when driving without knowing the presence of the caution point, and contribute to comfortable driving. Can do.

  Next, the caution point simplified display process performed in the in-vehicle navigation device 100 according to the present embodiment will be described with reference to the flowcharts of FIGS.

  FIG. 5 is a flowchart illustrating an example of processing for generating attention point information data. FIG. 6 is a flowchart showing an example of the processing for displaying the identification number of the attention point in the attention point simplified display. FIG. 7 is a flowchart illustrating an example of a process for displaying a simplified travel route in the caution point simplified display.

  First, in step S11 in FIG. 5, a guidance route is searched. In the search for the guidance route, a guidance route search from the current position of the host vehicle to the “destination” instructed by the user by setting the route search condition is performed. The controller 12 reads the map data from the DVD-ROM 1a to the buffer memory 11 via the DVD-ROM drive 1 as in the prior art, and automatically uses the search conditions set using the map data read to the buffer memory 11. A guide route from the current position of the car to the destination is searched. The searched route is stored in the guide route storage unit 15. The “destination” is input by an address, a telephone number, a facility name, or the like. Moreover, you may make it input by touching the destination on the map displayed on the display screen.

  In the next step S12, attention points are extracted. From the guidance route storage unit 15 in which the guidance route searched in step S11 is stored, a point to be noted on the guidance route (a point where a right or left turn is made at an intersection or a Y-shaped branch point) is extracted.

  In the next step S13, the attention points extracted in step S12 are numbered. This number is given to indicate the number of attention points from the destination on the guidance route.

  In the next step S14, the map data around each attention point extracted in step S12 is extracted from the DVD-ROM 1a. The map data to be extracted has a range in which the longitudinal direction is 300 m before and after the traveling direction of the host vehicle with the attention point as the center. Moreover, it is good also as a range which the surrounding map of a certain attention point and the surrounding map of the next attention point continue.

  In the next step S15, the map data around each attention point is compressed in the vertical direction. The degree of compression is, for example, a scale (300 m scale) in which a vertical distance of 600 m is associated with a vertical length of 2 cm of an area where the simplified map is displayed (simple traveling route display screen 31). Further, in consideration of the case where the area is widened, for example, map data compressed in stages to a scale (150 m scale) corresponding to a vertical length of 4 cm is generated. If the degree of compression is high, only the guidance route may be generated as data.

  In the next step S <b> 16, “attention point information data” in which the attention point number and the compressed map data are associated with each attention point is created and stored in the storage unit 17.

  By the above attention point information data generation processing, information on each attention point (simple map data obtained by compressing the number of attention points and map data around the attention points) is generated in association with the attention points on the guidance route.

  Next, the attention point number display process will be described with reference to FIG. It is assumed that a guidance route is searched, attention points exist, and attention point information data is generated and stored in the storage unit 17 by the processing of FIG. In addition, it is assumed that an instruction to display a caution point is displayed.

  First, in step S21, an initial screen (see FIG. 2) of the attention point simplified display is displayed.

  In the next step S22, it is determined whether or not the host vehicle is traveling around the attention point. The process waits until the vehicle travels around the attention point. When the vehicle travels around the attention point, the process proceeds to step S23. The position of the host vehicle detects the latitude and longitude based on the signal of the GPS receiver 3, and determines whether the host vehicle is traveling around the caution point based on whether it is included in the caution point information data. .

  In the next step S23, the identification number of the attention point is displayed on the map screen 22. In step S22, based on the map around the attention point including the position of the host vehicle, the identification number of the attention point is extracted from the attention point information data and displayed in the attention point number display area 26 of the map screen 22.

  In the next step S24, it is determined whether or not the host vehicle has passed around the attention point. If it is determined that the caution point has been passed, the process proceeds to step S25, and if the vehicle is traveling in the range around the caution point, the process waits.

  In the next step S25, the caution point number displayed in the caution point number display area 26 of the map screen 22 is deleted.

  In the next step S26, the number of attention points displayed in the attention point number display area 24 of the attention point screen 21 is reduced by one and displayed.

  In the next step S27, it is determined whether or not the host vehicle has reached the destination. If the destination has been reached, the attention point display process ends. If the destination has not been reached, the process returns to step S22 to continue the process.

  With the above caution point number display process, information on the location of caution points on the guidance route and the lane around which caution points the vehicle must travel and pass some caution points to the destination. The driver can easily acquire information such as whether or not the vehicle must be operated.

  Next, the attention point simplified travel route display process will be described with reference to FIG. Note that it is assumed that a guidance route is searched by setting a destination, and information regarding attention points on the guidance route is created and stored in the storage unit. In addition, it is assumed that the user has given an instruction to display the attention point in a simplified manner.

  First, in step S31, an initial screen of simplified attention point display is displayed. Since this is the same as step S21, description thereof is omitted.

  In the next step S32, it is determined whether or not there is an instruction to display a simple travel route. It waits until there is an instruction to display the simplified travel route, and when there is an instruction, the process proceeds to step S33. For example, when the user touches the caution point link bar 23, the submenu 27 is displayed when the user touches the caution point link bar 23, and it is selected from the submenu 27 whether to display some caution points. The

  In the next step S33, the simplified travel route is displayed according to the number instructed in step S32. The simplified travel route display is displayed below the attention point link bar 23 as shown in FIG. 3 (a) or 3 (b). One simple travel route is displayed, for example, 2 cm long, and up to three simple travel routes are displayed.

  In the simplified travel route display, the guidance route before and after the attention point is compressed and displayed. For example, when three simplified travel routes are displayed, the guidance routes before and after each caution point are compressed and displayed, and the guidance is continuously compressed across the three simplified travel route areas. The route is displayed.

  The simplified travel route display screen 31 is a part of the upper screen 21, and the size of the upper screen 21 is changed by displaying the simplified travel route display screen 31. Along with this, the size of the lower screen 22 displaying the map image indicating the traveling position of the host vehicle is also changed.

  In the next step S34, it is determined whether or not there is an instruction to change the size of the simplified travel route display screen 31. When the simplified travel route display screen 31 is displayed, it is displayed in a predetermined size (for example, 2 cm long), but the area is expanded by tracing the area in the vertical direction with, for example, a finger, Narrow the expanded area by tracing to close.

  If it is determined that there is an instruction to change the display size of the simplified travel route display screen 31, in the next step S35, the display size is changed according to the instruction, and the map image around the attention point is compressed according to the display size. Display at different degrees. When the display size of the simplified travel route display screen 31 is expanded, the compressed map image around the displayed attention point is displayed so that the degree of compression is reduced. Further, when the display size is increased, the vicinity of the attention point may be displayed. In this case, the guidance route may not be continuously displayed between the adjacent simplified travel route display screens 31.

  In the next step S36, it is determined whether or not there is an instruction to cancel the simplified travel route display. If there is an instruction to that effect, the process proceeds to step S37, and if there is no instruction, the process proceeds to step S34. Continue this process.

  When there is no instruction to change the display size in step S34, the process proceeds to step S38, and it is determined whether or not there is an instruction to change the simple travel route display. In order to change the simplified travel route display, for example, the scroll bar 32 displayed corresponding to the simplified travel route display screen on the upper screen 21 is touched to designate the display range of the caution point. When the display range is designated, the process proceeds to step S33 to display the designated area.

  On the other hand, when the display range change is not designated, the process proceeds to step S36 and the present process is continued.

  The outline of the guidance route can be known in advance by designating a caution point that is further away from the current position of the host vehicle by the above caution point simplified travel route display process. In addition, it is possible to easily grasp in advance the state of the road around the attention point on the guidance route scheduled to pass. Thereby, it is possible to prepare for the travel of the attention point in advance and contribute to safe travel.

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 initial screen of the attention point simplified display in the vehicle-mounted navigation apparatus which concerns on FIG. It is a figure which shows an example of the attention point simplification display screen on which the simple driving | running route was displayed. It is a figure which shows an example of the attention point simplification display screen by which the enlarged display of the simple travel route was performed. It is a flowchart which shows an example of the attention point information data generation process in the vehicle-mounted navigation apparatus which concerns on FIG. It is a flowchart which shows an example of the caution point number display process in the vehicle-mounted navigation apparatus which concerns on FIG. It is a flowchart which shows an example of the attention point simple travel route display process in the vehicle-mounted navigation apparatus which concerns on FIG.

Explanation of symbols

100: In-vehicle navigation device,
1a ... DVD-ROM (storage means),
3 GPS receiver (own vehicle position detection means),
4. Self-contained navigation sensor (own vehicle position detection means),
7: Display section (display means),
10 ... navigation device body,
11: Buffer memory (storage means),
12 ... Control part (control means),
15 ... Guidance route storage unit (storage means),
17 ... Storage part (storage means),
20 ... screen,
21 ... Upper screen,
22 ... Bottom screen,
23… Attention point link bar,
25, 42 ... guidance route,
31a, 31b, 31c... Simple travel route display screen.

Claims (7)

A vehicle-mounted navigation device having a function of searching for a guidance route including a caution point to a destination and guiding the vehicle along the guidance route,
Display means;
Storage means for storing map data;
Own vehicle position detecting means for detecting the current position of the own vehicle;
Control means for generating simplified map data obtained by extracting and compressing map data around each attention point on the guidance route from the storage means;
Have
When instructed to display a simplified map around the attention point, the control means divides the screen of the display means into an upper screen and a lower screen, and identifies the attention point on the upper screen. A vehicle-mounted navigation device, wherein an identification number and a simplified map image around the attention point are displayed, and a map image around the current position of the host vehicle is displayed on the lower screen.   The control means displays the simplified map image in a simplified route display area associated with the attention point, and the degree of compression is reduced as the size is increased according to the instructed size of the simplified route display area. The in-vehicle navigation device according to claim 1, wherein a simplified map image is displayed.   The said control means extracts the map data around the said attention point extracted from the said guidance route, The said identification number is given to the said map data in order from the said destination, The said identification number is given. Car navigation system.   4. The vehicle-mounted device according to claim 3, wherein the control means displays the simplified route display area corresponding to the attention point assigned with the specified identification number among the identification numbers on the upper screen. Navigation device.   The in-vehicle navigation device according to claim 2, wherein the control means displays an identification number of the attention point on the lower screen when the host vehicle is traveling around the attention point.   The control means displays link bars associated with all the attention points on the upper screen, and sets the number of the attention points between the position of the host vehicle and the destination adjacent to the link bar. The in-vehicle navigation device according to claim 2, which is displayed.   The in-vehicle navigation device according to claim 1, wherein the attention point is an intersection where a left turn or a right turn is instructed on the guidance route, or a Y-shaped branch point.

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