JP5135109B2 - Car navigation system - Google Patents

Description

  The present invention relates to an in-vehicle navigation device that performs a route guidance by specifying a desired starting point and a destination and searching for an optimum route between them, and in particular, a right or left turn point such as an intersection while traveling on a guidance route. When the vehicle deviates from the route guided in step 1, the point and the scale of the map displayed at that time are stored, and the map scale displayed on the display means when approaching that point in the next run is stored. The present invention relates to a vehicle-mounted navigation device that is changed to a more detailed map than the previous display.

  2. Description of the Related Art Conventionally, an in-vehicle navigation device that provides an automobile driver with an optimal route from a departure place to a destination has been provided. A conventional navigation device is a map data storage device such as a CD-ROM or an IC card in which map data is recorded, a display device, a gyro, a GPS (Global Positioning System), a vehicle speed sensor, and other current positions and directions of vehicles. It has a vehicle movement detection device to detect, reads out map data including the current position of the vehicle from the map data storage device, and draws a map image around the vehicle position on the display device based on the map data. In addition, the vehicle position mark (location) is displayed superimposed on the map image on the display screen, 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. This allows you to see at a glance where the vehicle is currently driving.

  The navigation device includes a road network database for route search. This road network database includes roads (routes) of map data, node data with nodes such as knots and inflection points as nodes, link data with routes connecting each node as links, and cost information for all links. Link cost data having (distance and required time) is accumulated. The navigation device refers to this database and sequentially searches for a link from the starting node to the destination node, and traces the node having the smallest cost information of the link and the link as a guide route, thereby shortening the shortest. Search and guide the route. As a route search method using such a database, a method called label determination method or Dijkstra method is used.

  Position information measured using a GPS receiver contains errors, so if the current position is off the guide route, the route matching process that corrects the current position on the guide route or the nearest road on the map A map matching process is performed to correct the image. In addition, guidance points such as intersections are set in the guide route data, and voice guidance data (for example, a voice message such as “This is a 300m intersection, please turn left”) is added as guidance at the guidance points. In this case, a voice message is reproduced and output via a speaker to guide the user.

  By the way, in-vehicle navigation devices have a high moving speed and are accompanied by a driving operation. Therefore, there are cases in which the guidance point on the guidance route does not correctly act according to the guidance while traveling on the guidance route. For example, a right turn may be made at a node in front of a node (guidance point) on which a right turn guidance is performed, or the guidance point may be overlooked and passed. If a driver misses a guidance point and passes, the driver's psychology is conscious of returning to the guided route and makes a right turn at the intersection node ahead of the guidance point that has passed. Driving operation to return to the guidance route.

  In such a state, the vehicle deviates (deviates) from the guidance route, and it becomes necessary to newly search for and guide the optimum route to the destination. For this reason, in a general vehicle-mounted navigation device, when it is detected that the vehicle has deviated from the guide route, the current position of the vehicle (the current vehicle position on the road that is not the guide route) is used as a starting point, It has a function to re-search for the optimum route to the destination. This re-search process is referred to as a reroute process.

  For example, the following Patent Document 1 (Japanese Patent Laid-Open No. 9-152351) discloses a vehicle navigation apparatus having an auto reroute mode in which a route is automatically re-searched when a deviation from the route is detected. This navigation device determines the auto-reroute mode when a route deviation is detected, and executes re-search processing when ON, performs display processing of the re-search route, and continues route guidance. When it is OFF, a re-search process is executed, and then it is determined whether the current position is on the re-search route (latest route).

  In many cases, it is an intersection of a complicated road structure or an intersection where it is difficult to change lanes to a dedicated lane for turning right or left. It is possible to make the same mistake over and over again at such an intersection, remembering the point where the off-route occurred in the past, and alerting the next time the vehicle approaches that point, make the same mistake. It is preferable not to repeat.

For example, in the following Patent Document 2 (Japanese Patent Application Laid-Open No. 2006-64563), a point where a route deviation has occurred in the past is stored, and when the route is next searched, the point is included in the route. A navigation device is disclosed in which when the vehicle approaches the point, the display screen of the display means is divided into screens, and an enlarged map of the intersection where the off-route has occurred is displayed together with a normal map image.
JP 09-152351 (paragraph [0028]) JP 2006-64563 A (paragraph [0049], FIG. 12)

  A general navigation apparatus includes a plurality of scale map data such as a wide area map, a middle area map, and a detailed map, and displays a map image of the most suitable scale. For example, in urban areas and suburbs, the number of roads installed in the unit area is different, and in the suburbs it is easy to see the route even if a wide area map or mid area map is displayed. However, it is difficult to see the route. In addition, when the distance between the starting point and the destination is long, the display of a wide area map may be suitable for observing the entire route. When traveling while displaying the guidance route and receiving route guidance, a map image of an appropriate scale is displayed depending on whether the current position is a suburb or an urban area.

  If there are multiple scale maps like this, if you change the scale of the map to be displayed, if you suddenly change from a wide area map to a detailed map (such as a city map), the displayed map will change greatly. There is a problem that the user of the navigation device is confused.

  In addition, when the technology of the invention disclosed in Patent Document 2 is applied when it is detected that the route is off, the display screen of the display means is divided into screens and an enlarged view of the corresponding point such as an intersection is displayed on one side. Since the screen division control is required, there arises a problem that the navigation device is complicated and expensive.

  The present application was made to solve the above problems, and when the route deviates during route guidance, the point and the scale of the map displayed at that time are stored, and the next run Therefore, it is an object of the present invention to provide an in-vehicle navigation device that can display a more detailed map when approaching the point and call attention so as not to deviate from the route.

In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is
A route search means for searching for a guide route from a designated departure place to a destination; a current position detection means for detecting a current position; a map storage means for storing a plurality of scale map data; and the map storage means. In the in-vehicle navigation device that displays a map image included in the stored map data and displays the current position of the vehicle on the map image to provide route guidance.
The in-vehicle navigation device includes: a matching processing unit that matches the current position detected by the current position detecting unit on the road of the map image; and whether the road matched by the matching processing unit is on a guide route. And when the departure from the guidance route is detected by the departure route determination unit, the scale of the map displayed on the display unit at that time is stored in association with the departure point. A point / map scale storage means and a map scale comparison means,
When the current position detected by the current position detecting means during route guidance falls within a predetermined distance range with respect to the route departure point stored in the point / map storage means, the map scale comparison means displays the current display means. The scale of the first map displayed is compared with the scale of the second map stored in the point / map scale storage means corresponding to the route departure point, and the scale of the first map is In a case where a map image more detailed than the scale of the second map is not displayed, the scale of the first map displayed on the display means is a scale capable of displaying a map image more detailed than the scale of the second map. It is characterized by changing to.

  The invention according to claim 2 of the present application is the in-vehicle navigation device according to claim 1, wherein the map data of the plurality of scales includes map data of at least three or more scales, and the map scale comparison means includes: The scale of the first map currently displayed on the display means is compared with the scale of the second map stored in the point / map scale storage means corresponding to the route departure point, and the first map If the scale of the first map is not to display a more detailed map image than the scale of the second map, the scale of the first map displayed on the display means is one step more detailed than the scale of the second map. The scale is changed so that the map image can be displayed.

  In addition, the invention according to claim 3 of the present application is the in-vehicle navigation device according to claim 1 or 2, wherein the map data stored in the map storage means includes the map data of a plurality of scales, Further, an enlarged view corresponding to the intersection node is stored, and during the route guidance, the current position detected by the current position detecting unit is a predetermined distance range with respect to the route departure point stored in the point / map scale storing unit. Then, the map scale comparison unit compares the scale of the first map currently displayed on the display unit and the scale of the second map stored in the point / map scale storage unit corresponding to the route departure point. If the scale of the second map is the one that displays the most detailed map image, the scale of the first map is not changed, and it corresponds to the intersection node that is the route departure point did And displaying an enlarged image using a large FIG.

In the invention according to claim 1, the in-vehicle navigation device guides the matching processing means for matching the current position detected by the current position detecting means on the road of the map image, and the road matched by the matching processing means. A route deviation judging means for judging whether or not the vehicle is on the route; and when the departure from the guidance route is detected by the route deviation judging means, the map displayed on the display means at that time together with the route deviation point A point / map scale storage means for storing the map in association with the scale, and a map scale comparison means;
If the current position detected by the current position detecting means during route guidance falls within a predetermined distance range with respect to the route departure point stored in the point / map scale storing means, the map scale comparing means displays the current display means. Is compared with the scale of the second map stored in the point / map scale storage means corresponding to the route departure point, and the scale of the first map is If the map image is not more detailed than the scale of the second map, the scale of the first map displayed on the display means can be displayed more detailed than the scale of the second map. Change to scale.

  According to such a configuration, when the vehicle-mounted navigation device 1 deviates from the guide route while traveling on the guide route, for example, when it deviates from a route guided at a right or left turn point such as an intersection on the guide route, The point and the scale of the map displayed at that time are memorized, and the map scale displayed on the display means is changed to a more detailed map than the previous one when the point approaches the point in the next run. Therefore, it is possible to display a map image of a point where the off-route has occurred in the past in a more detailed map image than that at that time, and to prevent the off-route from occurring.

  According to a second aspect of the present invention, in the in-vehicle navigation device according to the first aspect, the plurality of scale map data includes map data of at least three scales, and the map scale comparison means The scale of the first map displayed on the display means is compared with the scale of the second map stored in the point / map scale storage means corresponding to the route departure point. If the scale does not display a map image that is more detailed than the scale of the second map, the scale of the first map displayed on the display means is one step more detailed than the scale of the second map. Change to a scale that can display the image.

  According to such a configuration, when approaching a point where a past out-of-route has occurred in the next run, the scale of the map displayed on the display means is changed to a one-step detailed map from the previous time and displayed. It is possible to display a map image of a point where the off-route has occurred in the past as a map image that is one step more detailed than that at that time, and to prevent the off-route from occurring. Further, since the scale of the map image to be displayed is changed in one step, the displayed map image does not change suddenly and greatly, and the user is not confused.

According to a third aspect of the present invention, in the in-vehicle navigation apparatus according to the first or second aspect, the map data stored in the map storage means includes, in addition to the plurality of scale map data, , Memorize the enlarged map corresponding to the intersection node,
If the current position detected by the current position detecting means during route guidance falls within a predetermined distance range with respect to the route departure point stored in the point / map scale storing means, the map scale comparing means displays the current display means. Is compared with the scale of the second map stored in the point / map scale storage means corresponding to the route departure point, and the scale of the second map is When displaying the most detailed map image, the scale of the first map is not changed, and an enlarged view corresponding to the intersection node which is the route departure point is displayed.

  According to such a configuration, when the map image stored in the point / map scale storage means is a scale that displays the most detailed map, it approaches the point that caused the past off-route in the next run. In this case, the scale of the map currently displayed on the display means is not changed, and an enlarged image is displayed using an enlarged view stored in the map storage means corresponding to a point that deviates from the route. Therefore, it is possible to prevent the occurrence of the off-path. Further, since an enlarged view, which is a one-step detailed image, is displayed with respect to the most detailed map image, the map image does not change suddenly and the user is not confused.

  Hereinafter, specific examples of the present invention will be described in detail with reference to examples and drawings. However, the embodiment shown below exemplifies a vehicle-mounted navigation device for embodying the technical idea of the present invention, and is not intended to specify the present invention as this vehicle-mounted navigation device. The present invention is equally applicable to the in-vehicle navigation device of other embodiments included in the claims.

FIG. 1 is a block diagram showing a configuration of an in-vehicle navigation device 1 according to an embodiment of the present invention. The vehicle-mounted navigation device 1 includes a control unit 10, a current position detection unit 11, a map storage unit 12, a route search unit 13, a communication unit 14, a route deviation determination unit 15, an input unit 16, a matching processing unit 17, a display unit 18, A point / map scale storage unit 19 and a display scale comparison unit 20 are provided. The point / map scale storage means 19 can use a RAM (not shown),
The control means 10 is composed of a microprocessor having a ROM storing a program and a RAM for temporary storage, and controls each part. The current position detection means 11 is a positioning means that includes a GPS receiver, receives signals transmitted from a plurality of GPS satellites, and calculates the current position by latitude and longitude. The in-vehicle navigation device 1 is mounted. The current position of the automobile is measured at predetermined time intervals. The current position detecting means 11 includes a self-contained navigation means for calculating the current position from outputs from a vehicle speed sensor, an acceleration sensor, a rudder angle sensor and the like provided in the vehicle. When the GPS satellite signal cannot be received, Even when a positioning error due to GPS is large due to the influence of the path, the current position can be detected.

  The communication means 14 is an interface for communicating with various servers, and can acquire road traffic jam information and the like. The input means 16 includes a key, operation buttons, and a touch panel unit, and can set route search conditions such as a departure point, a destination, and a time condition by operating the menu screen and operating the keys and operation buttons.

  The map storage means 12 has road node data (node data) and road link data (link data), with map nodes having nodes such as intersections and branch points of roads as nodes and links connecting the nodes. ) Is stored. The road node data includes road node numbers, position coordinates, the number of connection links, intersection names, and the like. The road link data includes the number of road nodes as starting and ending points, road type, link length (link cost), required time, number of lanes, road width, and the like. Further, data such as bridges, tunnels, railroad crossings, and toll gates are added to the road link data as link attributes. The road type is information including a distinction between an expressway and a toll road and a distinction such as a national road or a prefectural road.

  The map data further stores background data including water system data such as coastlines, lakes, and river shapes, administrative boundary data, facility data including the location, shape, and name of the facility.

  In addition to the road data and background data, the map storage means 12 may include map image data stored in a vector format in order to display the map image in an easily viewable manner.

  When the departure place or destination is designated by the user, the route search means 13 refers to the road data stored in the map storage means 12, searches for the optimum route from the departure place to the destination, and guide route data. Is to create. The search for the optimum route is performed by various methods such as Dijkstra's method for linking and nodes from the road node corresponding to the current position or the starting point designated by the user to the road node corresponding to the destination designated by the user. Search, accumulate link length (link cost) and required time, etc., provide the route with the shortest total link length or total required time as a guide route, and provide road nodes and links belonging to the route as guide route data Is.

  The matching processing means 17 refers to the map data (road data) when the current position cannot be specified on the road (on the road data) based on the current position information of the vehicle measured by the current position detection means 11. Map matching is performed to match the position on the road closest to the current position.

  When displaying the current position on the map, when performing route guidance, and when the user designates a predetermined position and scale, the road data, background data, and map image data within a predetermined range are stored in the map. Read out from the means 12 and controlled by the control means 10, an icon indicating the current position (current position mark: own vehicle position mark), an image showing the trajectory and guidance route of the traveling road, and various guidance explanations, etc. The images are superimposed and combined to be developed in a VRAM (not shown) and displayed on the display means 18.

  As shown in FIG. 2, the map data is composed of several levels of data with different scales, from a wide area scale A covering a wide area to a city scale B covering a relatively narrow area with a lot of roads such as urban areas. The map data of an appropriate scale is selected according to the scale set by the person or the traveling area of the vehicle, and a map image is displayed on the display means 18.

  In FIG. 2, each map scale is, for example, a map scale displaying 1/500 of the city scale B and displaying the most detailed map image, and the city scale A to the wide area scale A are 1/1000, respectively. It can be set to 1/2000, 1/5000, 1/10000, 1/20000. Further, for an intersection node, enlarged map data may be stored corresponding to the node, and an enlarged map image may be displayed at an intersection having a complicated and difficult to understand structure.

  When receiving route guidance based on the route search result, map data of a predetermined scale including the current position of the navigation device 1 is extracted from the map storage means 12, and a current position mark indicating the current position on the map image or The guide route images are superimposed and displayed on the display means 18. Further, when the current position reaches a point requiring guidance such as an intersection or a branching point during route guidance, the control means 10 outputs a guidance such as a right turn, a left turn, or a straight ahead from a speaker (not shown).

  In this embodiment, the navigation device 1 includes a point / map scale storage unit 19 and displays a point and a point at that time when the route deviates from a route guided at a right or left turn point such as an intersection while traveling on the guide route. The scale of the map that had been stored is memorized. For this reason, the out-of-route determination means 15 monitors whether or not the current position subjected to the matching processing by the matching processing means 17 is on the guide route, and detects this when it is off the route. As a result, the information (latitude, longitude, intersection name and node name) of the point that has deviated from the guidance route and the scale of the map displayed at that time are stored in the point / map scale storage means 19. In the present specification, the scale of the map stored in the map / point storage means 19 is referred to as the scale of the second map.

  Whether the position on the matched road has deviated from the guide route is determined by comparing the link and node data of the guide route with the matched road link and node. If they match, it can be determined that the matched position is on the guide route, and if they do not match, it can be determined that the matched position is not on the guide route, that is, has deviated from the guide route.

  FIG. 3 is a diagram illustrating an example of the configuration of information stored in the point / map scale storage unit 19. As shown in FIG. 3, when a route deviation is detected by the route deviation determination means 15, the guidance route ID at that time, the use date and time, the information of the point where the route deviation is detected, the ID (intersection number) of the intersection node, The point information of the latitude and longitude of the point and the scale of the map displayed on the display means at that time are stored.

  The information on the off-route point and the map scale stored in the point / map scale storage means 19 is used as follows when the vehicle is traveling next while receiving route guidance. That is, when there is a point that has caused a departure in the past in front of the traveling guide route, the display scale comparison unit 20 displays the display unit 18 when the vehicle approaches the point (reaches a predetermined distance range). The scale of the currently displayed map is detected, and the map scale stored in the point / map scale storage means 19 is compared with the point where the off-route occurs. In the present specification, the scale of the map currently displayed on the display unit 18 is referred to as the scale of the first map with respect to the scale of the second map stored in the map / point storage unit 19.

  As a result, if the scale of the currently displayed map (first map scale) is a map with a larger scale than the map scale (second map scale) at the time of the off-path, the display scale is displayed. The comparison means 20 changes the scale so that it can display a map that is one step more detailed than the scale of the map when the off-route occurs, and the control means 10 reads the corresponding map data from the map storage means 12 and displays the map image. Displayed on the display means 18.

  In addition, in a node such as an intersection, an enlarged view or 3D image data (hereinafter simply referred to as an enlarged view) is prepared separately from a map image as enlarged image data for making it easy to visually recognize the shape of the intersection. (See FIG. 2). Therefore, when the map scale (second map scale) at the time of the off-route is the map image of the most detailed scale, the scale of the map currently displayed on the display means 18 is changed. Instead, the map storage unit 12 displays the enlarged map stored in correspondence with the intersection node.

  For example, as shown in FIG. 3, the scale of the map stored in the point / map scale storage means 19 is the middle scale B, and the map currently displayed on the display means 18 is the middle scale A or In the case of a map having a larger scale than the middle scale B, such as the wide scale B or the wide scale A, the map scale comparison means 20 is a map scale that is one step more detailed than the middle scale B, that is, the city. The scale of the map is changed to the scale A, and the control means 10 reads the map data of the corresponding scale from the map storage means 12 and displays the map image on the display means 18.

  That is, when the vehicle-mounted navigation device 1 according to the embodiment of the present invention deviates from the guide route while traveling on the guide route, for example, when it deviates from the route guided at the right or left turn point such as an intersection on the guide route. In addition, memorize the point and the scale of the map that was displayed at that time, and when you approach that point in the next run, change the map scale displayed on the display means to a more detailed map than the previous one Thus, the map image of the point where the off-route has occurred in the past can be displayed as a map image that is one step more detailed than that at that time, and the occurrence of off-route can be prevented.

  Next, the operation procedure of the control means 10 in the vehicle-mounted navigation device 1 according to the embodiment of the present invention will be described using the flowcharts of FIGS. 4 and 5. FIG. 4 is a flowchart showing a procedure for accumulating the point where the off-path is detected and information at that time. FIG. 5 is a flowchart showing a map display processing procedure when there is an out-of-route point during traveling on the guide route based on the accumulated out-of-route point and information at that time.

  In the vehicle-mounted navigation device 1, while traveling on the guide route, the control means 10 operates according to the procedure shown in the flowchart of FIG. 4, and accumulates the point where the off-route is detected and information at that time. When the route search condition is set in the process of step S101, the route search means 13 searches for the optimum route from the departure point to the destination in step S102 according to the route search case, and edits the guide route data in step S103. The control means 10 starts route guidance in step S104 according to the guidance route data.

  When the route guidance is started, the current position detection unit 11 detects the current position of the vehicle at a predetermined time interval in the process of step S105, and the matching processing unit 17 detects the current position detected by the current position detection unit 11. And the matching process is performed in the process of step S106 based on the acquired current position information. In step S107, the control means 10 determines whether or not the current position has reached the destination, that is, whether or not the route guidance has ended. If the destination has not been reached, the process proceeds to step S108. If the destination has been reached, the process ends.

  In the process of step S108, the off-route determination unit 15 determines whether or not the matched position is on the guide route, that is, whether or not the out-of-route has occurred. If it is determined in this determination process that the matched position is on the guide route, the process returns to step S105 and the current position detection process is repeated. If it is determined that the matched position is out of the guide route, the process proceeds to step S109, and the point where the out-of-route is detected and information on the map scale displayed on the display means 18 at that point are displayed. Store in the map scale storage means 19.

  When the point and the map scale are stored in the process of step S109, the process proceeds to the process of step S110 to determine whether or not there is a reroute process. When the auto reroute is set or the reroute process is instructed, the process returns to step S102, and the route search means 13 re-searches the route to the destination. If there is no reroute processing, the route guidance is ended, and the navigation device 1 ends the processing. If the reroute process is not performed, the process may be terminated by warning that the route is off.

  The navigation device 1 is assumed to travel according to route guidance. In that case, when approaching a point that has caused a path deviation in the past in the procedure of the flowchart of FIG. 5, the scale of the map displayed on the display means 18 is changed.

  When the route guidance is started, the current position detection unit 11 detects the current position of the vehicle at a predetermined time interval in the process of step S201, and the matching processing unit 17 detects the current position detected by the current position detection unit 11. Based on the acquired current position information, matching processing is performed in step S202. In step S203, the control means 10 determines whether or not the current position has reached the destination, that is, whether or not the route guidance has ended. If the destination has not been reached, the process proceeds to step S204. If the destination has been reached, the process ends.

  In step S204, the off-route detection means 15 determines whether or not the matched position is on the guide route, that is, whether or not off-route has occurred. If it is determined in this determination process that the matched position is not on the guide route (departs from the guide route), the process proceeds to step S212, an error is displayed, and the process ends. This process can be replaced with a process using a reroute function.

  If it is determined that the matched position does not deviate from the guidance route, the process proceeds to step S205, and the point / map scale storage unit 19 is referred to, and the route is previously past a predetermined distance range in the guidance route. It is determined whether or not there is a deviated point (deviation point). If there is no departure point, the process returns to step S201.

  If there is a past departure point in front of the guide route, the display scale comparison means 20 detects the scale of the map currently displayed on the display means 18 in the process of step S206, and the point / The scale of the map stored in the map scale storage means 19 is compared.

  As a result, if the scale of the currently displayed map is a more detailed scale than that of the map when the off-route occurred, the process proceeds to step S210, the map scale is not changed, and the process of step S213 is performed. Proceed to

  If the scale of the currently displayed map is larger than the scale of the map at the time when the off-route occurred, the process proceeds to the process of step S208, and the scale (the first scale stored in the point / map storage means 19) 2), it is determined whether or not there is a one-step detailed map. When there is no one-step detailed scale map data, that is, when the map scale stored in the point / map scale storage means 19 displays the most detailed map, the process proceeds to step S211 and enlarged. A figure is displayed and it progresses to the process of step S213.

  If it is determined in step S208 that there is a one-step detailed scale map, the process proceeds to step S209, and the control means 10 displays the scale currently displayed on the display means 18 (the scale of the first map). ), The map data corresponding to the scale (one scale detailed with respect to the scale of the second map) is read and displayed, and the process proceeds to step S213.

  In step S213, the control means 10 determines whether or not the current position has reached the destination, that is, whether or not the route guidance has ended. If the destination has not been reached, the process proceeds to step S208. If the destination has been reached, the process ends.

  In addition, there is a point (deviation point) that has deviated in the past in front of a predetermined distance range in the guide route, and the scale of the map displayed on the display means 18 is changed or an enlarged view of the departure point (intersection) is displayed. At this time, when the current position passes through the departure point, the scale can be changed, or the map can be returned to the scale before displaying the enlarged view.

  As described above in detail, according to the present invention, when deviating from a route guided at a right or left turn point such as an intersection during traveling on a guide route, the scale of the map displayed at that point and at that point Is stored and the map scale displayed on the display means is changed to a more detailed map scale than the previous one when the vehicle approaches the point in the next run. It is possible to change the scale of the map at the selected point to a map scale that is one step more detailed than that at that time, and to prevent the occurrence of off-route.

It is a block diagram which shows the structure of the navigation apparatus concerning the Example of this invention. It is a figure which shows an example of the scale classification of the map data used in the navigation apparatus concerning the Example of this invention. It is a figure which shows an example of the data structure at the time of memorize | storing the point and the reduced scale of the map at that time which detected the path | route off. It is a flowchart which shows the process procedure in the control means at the time of accumulating the point which detected the path | route off, and the information at that time. It is a flowchart which shows the process procedure of the map display in a control means when there exists an out-of-route point at the time of driving | running | working guidance route based on the accumulated out-of-route point and information at that time.

Explanation of symbols

1: vehicle-mounted navigation device 10: control means 11: current position detection means 12: map storage means 13: route search means 14: communication means 15: off-route determination means 16: input means 17: matching processing means 18: display means 19 : Point / map scale storage means 20: display scale comparison means

Claims (3)

A route search means for searching for a guide route from a designated departure place to a destination; a current position detection means for detecting a current position; a map storage means for storing a plurality of scale map data; and the map storage means. In the in-vehicle navigation device that displays a map image included in the stored map data and displays the current position of the vehicle on the map image to provide route guidance.
The in-vehicle navigation device includes: a matching processing unit that matches the current position detected by the current position detecting unit on the road of the map image; and whether the road matched by the matching processing unit is on a guide route. And when the departure from the guidance route is detected by the departure route determination unit, the scale of the map displayed on the display unit at that time is stored in association with the departure point. A point / map scale storage means and a map scale comparison means,
If the current position detected by the current position detecting means during route guidance falls within a predetermined distance range with respect to the route departure point stored in the point / map scale storing means, the map scale comparing means displays the current display means. Is compared with the scale of the second map stored in the point / map storage means corresponding to the route departure point, and the scale of the first map is In a case where a map image more detailed than the scale of the second map is not displayed, the scale of the first map displayed on the display means is a scale capable of displaying a map image more detailed than the scale of the second map. A vehicle-mounted navigation device characterized by being changed to   The map data of the plurality of scales include map data of at least three or more scales, and the map scale comparison means corresponds to the scale of the first map currently displayed on the display means and the route departure point. When the scale of the first map is compared with the scale of the second map stored in the point / map scale storage means, the map of the first map does not display a more detailed map image than the scale of the second map, The in-vehicle navigation system according to claim 1, wherein the scale of the first map displayed on the display means is changed to a scale capable of displaying a map image that is one step more detailed than the scale of the second map. apparatus. In addition to the plurality of scale map data, the map data stored in the map storage means further stores an enlarged view corresponding to the intersection node,
If the current position detected by the current position detecting means during route guidance falls within a predetermined distance range with respect to the route departure point stored in the point / map scale storing means, the map scale comparing means displays the current display means. Is compared with the scale of the second map stored in the point / map scale storage means corresponding to the route departure point, and the scale of the second map is 2. When displaying the most detailed map image, the scale of the first map is not changed, and an enlarged view corresponding to an intersection node of the route departure point is displayed. Or the vehicle-mounted navigation apparatus of Claim 2.

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