JP2011209119A - Route guidance device, method of guiding route, and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a route guidance device, a method of guiding a route, and a computer program for allowing an intersection to be guided to be securely specified.SOLUTION: Information on a guide route and an intersection to be guided set to a navigation apparatus 1 is acquired (S4). When the second intersection from the intersection to be guided in the front of an advance direction of a vehicle is passed, a scale of a map displayed on a liquid crystal display 15 is changed to a scale including an intersection that the vehicle has passed and the intersection to be guided (S9). Then, a scale of a map displayed on the liquid crystal display 15 each time when the vehicle passes the intersection is changed to a scale including the intersection that the vehicle has passed and the intersection to be guided for setting (S8-S13).

Description

  The present invention relates to a route guidance device, a route guidance method, and a computer program that perform guidance related to a guidance route.

  2. Description of the Related Art In recent years, a navigation device is often mounted on a vehicle that provides vehicle travel guidance so that a driver can easily arrive at a desired destination. Here, the navigation device detects the current position of the vehicle by a GPS receiver or the like, acquires map data corresponding to the current position through a recording medium such as a DVD-ROM or HDD or a network, and displays it on a liquid crystal monitor. It is a device that can do. Furthermore, the navigation device has a route search function for searching for an optimum route from the vehicle position to the destination when a desired destination is inputted, and displays a guidance route on the display screen and approaches the intersection. In such a case, the user is surely guided to a desired destination by providing voice guidance.

  Here, when performing left / right turn guidance at an intersection, it is important to allow the user to accurately identify the position of the guidance target intersection that is to be turned right / left. Thus, conventionally, guidance of a guidance target intersection has been performed based on the number of intersections and traffic lights from the current position of the vehicle to the guidance target intersection. For example, in Japanese Patent Application Laid-Open No. 2007-155351, when a vehicle passes through an intersection with a traffic signal two before the guidance target intersection, the voice guidance “the intersection with the second signal is in the left direction.” Is described.

JP 2007-155351 A (pages 10 to 12, FIG. 5)

  However, in the technique described in Patent Document 1, the user can grasp the number of intersections and traffic lights from the current position of the vehicle to the guidance target intersection, but visually determines the positional relationship between the vehicle and the guidance target intersection. It was difficult to grasp.

  In addition, it is conceivable to refer to a map displayed on the display of the navigation device. Conventionally, however, a fixed scale set in advance by the user is used until the guide intersection is approached within a predetermined distance (for example, within 300 m). Display a map around the vehicle. Therefore, even if the map displayed on the display is referred to, it is difficult to visually grasp the positional relationship between the vehicle and the guidance target intersection.

  The present invention has been made to solve the above-described conventional problems, and it is possible to easily grasp the positional relationship between the moving object and the guidance target intersection and to reliably identify the guidance target intersection. It is an object of the present invention to provide a route guidance device, a route guidance method, and a computer program.

In order to achieve the above object, a route guidance device (1) according to claim 1 of the present application obtains a guidance route setting means (13) for setting a guidance route and a guidance target intersection on the guidance route, and a current position of the mobile body Current position acquisition means (13), map display means (13) for displaying a map around the moving body on the display device (15) at a set scale, and information on intersections on the guide route are acquired. Intersection information acquisition means (13) and intersection passage determination means for determining whether or not the mobile body has passed the intersection based on the current position of the mobile body and information on the intersection acquired by the intersection information acquisition means (13) and when the intersection passing determination means determines that the moving body has passed the intersection, the intersection where the moving body has passed and the traveling direction forward of the moving body The scale calculating means (13) for calculating the scale of the map capable of displaying the guidance target intersection on a single screen, and the scale of the map displayed on the display device to the scale calculated by the scale calculating means. And a scale changing means (13) for changing.
Here, the “moving body” is not limited to a vehicle, and may be anything that moves on a road.
In addition, the “guidance target intersection” refers to an intersection that is a target for performing guidance such as a direction of travel when performing guidance of movement of a moving body according to a guidance route.

  The route guidance device (1) according to claim 2 is the route guidance device according to claim 1, wherein the intersection passage determining means (13) is configured such that the moving body is in front of the traveling direction of the moving body. It is determined whether or not a certain number of intersections before the guidance target intersection have passed, and the scale calculation means (13) is configured so that the moving body is in front of the moving body by the intersection passage determination means. The scale is calculated when it is determined that the vehicle has passed a predetermined number of intersections before the guidance target intersection.

  Further, the route guidance device (1) according to claim 3 is the route guidance device according to claim 1 or 2, wherein the route guidance means (13) is provided by the intersection passage determination means (13). When it is determined that the moving body has passed the intersection, the number of intersections from the intersection where the moving body passes to the guidance target intersection ahead of the moving body is guided. And

  Moreover, the route guidance device (1) according to claim 4 is the route guidance device according to claim 3, wherein the route guidance means (13) is configured such that the moving body is moved by the intersection passage determination means (13). When it is determined that the vehicle has passed the intersection, the number of intersections where traffic lights are installed among the intersections from the intersection where the mobile body has passed to the guidance target intersection ahead of the mobile body in the traveling direction is calculated. It is characterized by guiding.

  According to a fifth aspect of the present invention, there is provided a route guidance method comprising: a guidance route setting step for setting a guidance route and a guidance target intersection on the guidance route; a current position obtaining step for obtaining a current position of the moving body; and a periphery of the moving body. A map display step for displaying the map on the display device (15) at a set scale, an intersection information acquisition step for acquiring information related to the intersection on the guide route, a current position of the mobile body and the intersection information acquisition step Based on the information about the intersection acquired by the intersection, an intersection passage determination step for determining whether or not the mobile body has passed the intersection, and the intersection passage determination step determines that the mobile body has passed the intersection. Display the intersection where the moving body passes and the guidance target intersection ahead of the moving body in a single screen. And having a scale calculation step of calculating the scale of the performance map, and a scale changing step of changing the calculated scaled by said scaling calculation step the scale of the map displayed on the display device.

  Further, a computer program according to claim 6 is installed in a computer, a guidance route setting function for setting a guidance route and a guidance target intersection on the guidance route, a current position obtaining function for obtaining a current position of a moving body, A map display function for displaying a map around a mobile object on a display device at a set scale, an intersection information acquisition function for acquiring information related to an intersection on the guide route, a current position of the mobile object and the intersection information acquisition Based on the information about the intersection acquired by the function, it is determined that the moving body has passed the intersection by the intersection passing determination function for determining whether the moving body has passed the intersection and the intersection passing determination function. Display the intersection where the moving body has passed and the guidance target intersection ahead of the moving body in a single screen. And scale calculating function of calculating the scale of the map such, characterized in that to execute a scale change function of changing the scale of the map displayed on the display device to the scale calculated by the scale calculation function.

  According to the route guidance device according to claim 1 having the above-described configuration, the display device is based on the positional relationship between the moving object and the guidance target intersection that is ahead in the traveling direction of the moving object each time the moving object passes the intersection. It is possible to change the scale of the map displayed on the screen. As a result, the user can visually grasp the positional relationship between the moving body and the guidance target intersection by visually recognizing the map displayed on the display device, and reliably identify the guidance target intersection. Is possible.

  In addition, according to the route guidance device of the second aspect, since the scale of the map displayed on the display device is changed every time the moving body passes through the intersection arranged close to the guidance target intersection, the guidance is particularly provided. When the target intersection approaches the moving body, it is possible to reliably specify the guidance target intersection.

  Further, according to the route guidance device according to the third aspect, since the number of intersections up to the guidance target intersection is guided, it is possible to reliably identify the guidance target intersection together with the map displayed on the display device. It becomes.

  In addition, according to the route guidance device of the fourth aspect, since the number of intersections with signals up to the guidance target intersection is guided, the guidance target intersection is surely specified together with the map displayed on the display device. Is possible.

  In addition, according to the route guidance method of the fifth aspect, each time the moving body passes through the intersection, the display is displayed on the display device based on the positional relationship between the moving body and the guidance target intersection ahead of the moving body in the traveling direction. It is possible to change the scale of the map to be set. As a result, the user can visually grasp the positional relationship between the moving body and the guidance target intersection by visually recognizing the map displayed on the display device, and reliably identify the guidance target intersection. Is possible.

  Furthermore, according to the computer program of the sixth aspect, each time the moving body passes through the intersection, the display is displayed on the display device based on the positional relationship between the moving body and the guidance target intersection ahead of the moving body in the traveling direction. It is possible to change and set the scale of the map. As a result, the user can visually grasp the positional relationship between the moving body and the guidance target intersection by visually recognizing the map displayed on the display device, and reliably identify the guidance target intersection. Is possible.

It is the block diagram which showed the navigation apparatus which concerns on this embodiment. It is a flowchart of the route guidance processing program which concerns on this embodiment. It is the figure which showed the guidance screen displayed on a liquid crystal display, before a vehicle approaches a guidance object intersection. It is the figure which showed the guidance screen displayed on a liquid crystal display, when a vehicle passes the 2nd intersection before guidance object intersection. It is the figure which showed the guidance screen displayed on a liquid crystal display, when a vehicle passes the intersection just before a guidance object intersection.

  Hereinafter, a route guidance device according to the present invention will be described in detail with reference to the drawings based on an embodiment in which the navigation device is embodied. First, a schematic configuration of the navigation device 1 according to the present embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing a navigation device 1 according to this embodiment.

  As shown in FIG. 1, the navigation device 1 according to the present embodiment includes a current position detection unit 11 that detects a current position of a vehicle on which the navigation device 1 is mounted, a data recording unit 12 that records various data, Based on the input information, the navigation ECU 13 that performs various arithmetic processes, the operation unit 14 that receives operations from the user, and the liquid crystal display 15 that displays a map around the vehicle and a set guidance route for the user. A speaker 16 that outputs voice guidance related to route guidance, a DVD drive 17 that reads a DVD that is a storage medium storing a program, and a communication module 18 that communicates with an information center such as a probe center or a VICS center. , Is composed of.

Below, each component which comprises the navigation apparatus 1 is demonstrated in order.
The current position detection unit 11 includes a GPS receiver 21, a vehicle speed sensor 22, a steering sensor 23, a gyro sensor 24, and the like, and can detect the current vehicle position, direction, vehicle traveling speed, current time, and the like. It has become. Here, in particular, the vehicle speed sensor 22 is a sensor for detecting a moving distance and a vehicle speed of the vehicle, generates a pulse according to the rotation of the driving wheel of the vehicle, and outputs a pulse signal to the navigation ECU 13. And navigation ECU13 calculates the rotational speed and moving distance of a driving wheel by counting the generated pulse. Note that the navigation device 1 does not have to include all of the above five types of sensors, and the navigation device 1 may include only one or more of these types of sensors.

  The data recording unit 12 is a driver for reading out an external storage device and a hard disk (not shown) as a recording medium, a map information DB 31 recorded on the hard disk, a predetermined program, etc. and writing predetermined data on the hard disk. And a recording head (not shown).

  Here, the map information DB 31 includes, for example, link data 32 relating to roads (links), node data 33 relating to node points, facility data 34 relating to facilities, map display data for displaying a map, intersection data relating to each intersection, and routes. It is a storage means in which search data for searching, search data for searching for points, and the like are stored.

  On the other hand, when the destination is selected, the navigation ECU (Electronic Control Unit) 13 guides the route from the departure point (current position or home) to the destination based on the link data stored in the map information DB 31. And a guide route setting process for setting a guide target intersection on the guide route, a current position acquisition process for acquiring the current position of the vehicle, a map display process for displaying a map around the vehicle on the liquid crystal display 15 at a set scale, and a guide route Intersection information acquisition processing for acquiring information on the upper intersection, intersection passage determination processing for determining whether or not the vehicle has passed the intersection, based on information on the current position of the vehicle and the intersection, it is determined that the vehicle has passed the intersection Display the intersection where the vehicle has passed and the guidance target intersection ahead of the moving body in the same screen. Scale calculation processing of calculating the scale of the map, an electronic control unit that performs overall control of the navigation device 1 of the scale change processing for changing the scale that is calculated scale of the map displayed on the liquid crystal display 15. The CPU 41 as an arithmetic device and a control device, the RAM 41 used as a working memory when the CPU 41 performs various arithmetic processes, a RAM 42 for storing route data when a route is searched, and a control program In addition, an internal storage device such as a ROM 43 in which a route guidance processing program (FIG. 2) and the like are recorded, and a flash memory 44 for storing a program read from the ROM 43 is provided.

  The operation unit 14 is operated when inputting a departure point as a travel start point and a destination as a travel end point, and includes a plurality of operation switches (not shown) such as various keys and buttons. Then, the navigation ECU 13 performs control to execute various corresponding operations based on switch signals output by pressing the switches. The operation unit 14 can also be configured by a touch panel provided on the front surface of the liquid crystal display 15.

  The liquid crystal display 15 also includes a map image including a road, traffic information, operation guidance, operation menu, key guidance, a planned travel route from the departure point to the destination, guidance information along the planned travel route, news, weather Forecast, time, mail, TV program, etc. are displayed. In addition, guidance regarding a guidance target intersection in front of the traveling direction of the vehicle is also displayed. Furthermore, in the present embodiment, as described later, the vehicle has passed the scale of the map displayed on the liquid crystal display 15 after the vehicle has passed a predetermined number of intersections before the guidance target intersection (for example, two before). The intersection and the guidance target intersection ahead in the direction of travel are changed to the maximum scale of the map that can be displayed on one screen. Then, each time the vehicle passes through the intersection, the intersection where the vehicle has passed and the guidance target intersection ahead in the traveling direction are changed to the maximum scale of the map that can be displayed on one screen.

  Further, the speaker 16 outputs voice guidance for guiding traveling along the planned traveling route and traffic information guidance based on an instruction from the navigation ECU 13. Also, voice guidance relating to the guidance target intersection in front of the traveling direction of the vehicle (for example, “the intersection with the second signal is in the left direction”) is also output.

  The DVD drive 17 is a drive that can read data recorded on a recording medium such as a DVD or a CD. Then, the map information DB 31 is updated based on the read data.

  In addition, the communication module 18 is traffic information composed of information such as traffic jam information, regulation information, and traffic accident information transmitted from a traffic information center such as a VICS (registered trademark: Vehicle Information and Communication System) center or a probe center. For example, a mobile phone or DCM.

  Next, a route guidance processing program executed by the navigation ECU 13 in the navigation device 1 having the above configuration will be described with reference to FIG. FIG. 2 is a flowchart of the travel guidance processing program according to the present embodiment. Here, the route guidance processing program is a program that is executed after the ACC of the vehicle is turned on, and that guides traveling according to the guidance route. Note that the program shown in the flowchart of FIG. 2 below is stored in the RAM 42 and the ROM 43 provided in the navigation device 1 and is executed by the CPU 41.

  First, in step (hereinafter abbreviated as S) 1 in the route guidance processing program, the CPU 41 acquires navigation information. Here, the navigation information acquired in S1 includes, for example, information on the current position and direction of the vehicle. The current position and direction of the vehicle are acquired based on the detection result of the current position detection unit 11. In addition, map matching for specifying the current position of the acquired vehicle on the map is also performed.

  Next, in S <b> 2, the CPU 41 displays a map around the current position of the vehicle on the liquid crystal display 15 at a scale set in the navigation device 1. Note that the scale of the map set in the navigation device 1 can be changed within a predetermined scale range (for example, 1/5000 to 1 / 20480,000) based on the user's operation. Further, when a guidance route is set in the navigation device 1, the guidance route is also displayed superimposed on the map.

Here, FIG. 3 is a diagram showing a guide screen 51 displayed on the liquid crystal display 15 in S2. FIG. 3 shows a guidance screen 51 when a map is displayed at a scale of 1 / 640,000.
As shown in FIG. 3, on the guidance screen 51 of the liquid crystal display 15, a map image around the current position of the vehicle, an own vehicle position mark 52 indicating the current position of the vehicle matched on the map, and the navigation device 1 are set. The guided route 53 and the guidance target intersection 54 are displayed. As the vehicle moves, the map is scrolled and rotated, and the user can grasp the map around the vehicle, the current position of the vehicle, the guidance route, and the guidance target intersection by visually recognizing the guidance screen 51. It becomes possible.

  Subsequently, in S3, the CPU 41 determines whether or not a guidance route is set in the navigation device 1. Here, the guidance route is set by the navigation device 1 based on the result of route search processing from the departure point (for example, the current position of the host vehicle) to the destination selected by the user. In addition, a guidance target intersection is set together with the guidance route. The guidance target intersection is an intersection to which guidance such as a direction of travel is given when the navigation apparatus 1 provides guidance for traveling according to the guidance route. The route search processing is performed by a known Dijkstra method using link data and node data stored in the map information DB 31, traffic information acquired from the VICS center, and the like.

  As a result of the determination in S3, when it is determined that a guidance route is set (S3: YES), the process proceeds to S4. On the other hand, when it is determined that the guidance route is not set (S3: NO), the route guidance processing program is terminated.

  In S <b> 4, the CPU 41 acquires the information related to the guide route set in the navigation device 1 by reading from the RAM 42.

  Next, in S5, the CPU 41 specifies a guidance target intersection that is ahead in the traveling direction of the vehicle based on the information about the guidance route acquired in S4.

  After that, in S6, the CPU 41 acquires information related to the guidance target intersection ahead of the traveling direction of the vehicle specified in S5 based on the information related to the guidance route acquired in S4 and the map information stored in the map information DB 31. . The information about the guidance target intersection ahead of the traveling direction of the vehicle acquired in S6 includes the position of the guidance target intersection (identified by the node number, coordinates, etc.), the distance from the vehicle to the guidance target intersection, and the guidance target intersection. There is information such as the guide direction (guided traveling direction). As the distance from the vehicle to the guidance target intersection, the number of intersections from the vehicle to the guidance target intersection is calculated. Then, the number of intersections from the vehicle to the guidance target intersection is calculated based on the current position of the vehicle, the position of the guidance target route acquired in S1, and the map information stored in the map information DB 31. In the present embodiment, the number of intersections with traffic lights, in particular, is calculated. Further, the guidance direction of the guidance target intersection is specified based on the guidance route.

  Next, in S7, the CPU 41 determines whether or not the vehicle has passed a predetermined number of intersections before the guidance target intersection specified in S5 (for example, two before) based on the information about the guidance target intersection acquired in S5. Determine. In the present embodiment, it is determined whether or not an intersection having a traffic signal with a predetermined number of traffic ahead is passed among the intersections.

  If it is determined that the vehicle has passed a predetermined number of intersections before the guidance target intersection (S7: YES), the process proceeds to S8. On the other hand, if it is determined that the vehicle has not passed the predetermined number of intersections before the guidance target intersection (S7: NO), the vehicle waits until it passes a predetermined number of intersections before the guidance target intersection.

In S <b> 8, the CPU 41 calculates a maximum positional relationship display scale that is the maximum scale of the map that can display on the liquid crystal display 15 on one screen the intersection where the vehicle has passed and the guidance target intersection ahead of the traveling direction of the vehicle.
Specifically, the CPU 41 executes the following processes (A) and (B).
(A) First, the CPU 41 acquires the coordinates of the intersection where the vehicle has passed and the coordinates of the guidance target intersection.
(B) Next, the CPU 41 positions the center of the screen at a substantially middle point between the intersection where the vehicle passes and the guidance target intersection, and the coordinates of the intersection where the vehicle passes and the coordinates of the guidance target intersection are both the liquid crystal display 15. The maximum scale of the map included in the display area is calculated. Since the coordinates of the intersection where the vehicle has passed are substantially the same as the coordinates of the current position of the vehicle at that time, the coordinates of the intersection of the vehicle that has passed through the vehicle are the current position coordinates of the vehicle when the vehicle has passed the intersection. It is also possible to perform calculations using these.

  Subsequently, in S9, the CPU 41 executes a scale changing process for changing and setting the scale of the map displayed on the liquid crystal display 15 to the maximum positional relationship display scale calculated in S8. As a result, the map scale is switched from the current scale, and the intersection where the vehicle has passed and the guidance target intersection are displayed on the display screen of the liquid crystal display 15 in the maximum size.

Here, FIG. 4 is a diagram showing a guidance screen 61 displayed on the liquid crystal display 15 when the vehicle passes an intersection with a traffic light two before the guidance target intersection. FIG. 4 shows a guidance screen 61 when the scale of 1/10000 is calculated as the maximum positional relationship display scale in S8.
As shown in FIG. 4, on the guidance screen 61 of the liquid crystal display 15, the vehicle position mark 52 is located between a traffic light intersection 62 two before the guidance target intersection and a traffic light intersection 63 one guidance prior to the guidance target intersection. The vehicle position mark 52 is displayed on the fixed map on the guidance screen 61 as the vehicle moves. Compared with the guidance screen 51 shown in FIG. 3, the map of the guidance screen 61 is enlarged, and the vehicle position mark 52, the intersection 63, and the guidance target intersection 54 are all included in the display area of the liquid crystal display 15. More detailed information can be displayed. Accordingly, the map displayed based on the position relationship of the intersection is not scrolled or rotated, and the vehicle position mark 52 moves between the intersections on the map on the guidance screen 61 as the vehicle moves. By visually recognizing the screen 61, it is possible to clearly grasp the positional relationship among the current position of the vehicle, the intersection 63, and the guidance target intersection 54.

  Thereafter, in S10, the CPU 41 provides guidance for the guidance target intersection. Specifically, when the guidance target intersection in front of the traveling direction of the vehicle is an intersection that guides a right turn, and the vehicle passes an intersection with a traffic signal two times before the guidance target intersection, the “second signal It will turn right at the intersection with "". In addition, when the guidance target intersection in front of the traveling direction of the vehicle is an intersection that guides a right turn, and the vehicle passes through the intersection with a traffic signal just before the guidance target intersection, “the intersection with the next signal is Voice guidance is output.

  Next, in S11, the CPU 41 determines whether or not the vehicle has passed through the guidance target intersection that is ahead in the traveling direction, based on the current position of the vehicle and the information on the guidance target intersection acquired in S5.

  And when it determines with the vehicle having passed the guidance object intersection ahead of the advancing direction (S11: YES), it transfers to S12. In S <b> 12, the CPU 41 changes and sets the map around the current position of the vehicle to the scale set in the navigation device 1. As a result, the map around the vehicle (FIG. 3) is displayed at the scale of the map displayed before the vehicle approaches the guidance target intersection.

  On the other hand, if it is determined that the vehicle has not passed the guidance target intersection that is ahead in the traveling direction (S12: NO), subsequently, in S13, the CPU 41 determines whether or not the vehicle has passed the intersection. . Specifically, based on the current position of the vehicle and the map information stored in the map information DB 31, it is determined whether or not the vehicle has passed the intersection. In the present embodiment, it is determined whether or not an intersection with a traffic light is passed.

  And when it determines with the vehicle having passed the intersection (S13: YES), it transfers to S8. Then, the CPU 41 calculates a maximum positional relationship display scale that is the maximum scale of the map that can display the intersection where the vehicle has passed again and the guidance target intersection ahead of the traveling direction of the vehicle on one screen on the liquid crystal display 15 ( S8) A scale change process (S9) is executed for changing and setting the scale of the map displayed on the liquid crystal display 15 to the calculated maximum scale of the positional relationship display. As a result, the map scale is further switched from the current map scale, and the intersection where the vehicle has passed and the guidance target intersection are displayed on the display screen of the liquid crystal display 15 in the maximum size.

Here, FIG. 5 is a diagram showing a guidance screen 71 displayed on the liquid crystal display 15 when the vehicle passes an intersection with a traffic light just before the guidance target intersection. FIG. 5 shows the guidance screen 71 when the scale of 1/5000 is calculated as the maximum positional relationship display scale in S8.
As shown in FIG. 5, on the guidance screen 71 of the liquid crystal display 15, a vehicle position mark 52 is displayed between the traffic signalized intersection 63 just before the guidance target intersection and the guidance target intersection 54. The own vehicle position mark 52 moves on the map on which the guidance screen 71 is fixed. Compared with the guidance screen 61 shown in FIG. 4, the guidance screen 71 is more detailed in a range where the map is enlarged and both the vehicle position mark 52 and the guidance target intersection 54 are included in the display area of the liquid crystal display 15. Information can be displayed. Accordingly, the map displayed based on the position relationship of the intersection is not scrolled or rotated, and the vehicle position mark 52 moves between the intersections on the map on the guidance screen 71 as the vehicle moves. By visually recognizing the screen 71, it is possible to clearly grasp the positional relationship between the current position of the vehicle and the guidance target intersection 54.

  Moreover, in S10 performed after that, the guidance regarding a guidance object intersection is performed again, and it transfers to the determination process of S11. Similarly, the processes of S8 to S11 and S13 are repeatedly executed until passing the guidance target intersection.

As described in detail above, in the navigation device 1 according to the present embodiment, the route guidance method by the navigation device 1 and the computer program executed by the navigation device 1, the guidance route and the guidance target intersection set in the navigation device 1 are related. When the information is acquired (S4) and the vehicle passes the intersection in front of the guidance target intersection two ahead of the vehicle in the traveling direction, the intersection where the vehicle passes the scale of the map displayed on the liquid crystal display 15 and the guidance target intersection (S9), and then the map scale displayed on the liquid crystal display 15 every time the vehicle passes through the intersection is changed to a scale including the intersection where the vehicle passes and the guidance target intersection. (S8 to S13), the user visually recognizes the map displayed on the liquid crystal display 15. Therefore, it becomes possible to visually easily grasp the positional relationship between the guide target intersection and the vehicle, it is possible to reliably identify the guidance target intersection.
Further, since the map scale displayed on the liquid crystal display 15 is changed and set every time the vehicle passes an intersection arranged close to the guidance target intersection, particularly when the guidance target intersection approaches the vehicle, It is possible to reliably identify the guidance target intersection.
In addition, every time the vehicle passes an intersection with a signal in front of the intersection to be guided, the number of intersections with a signal up to the intersection to be guided is guided (S10), so that it is combined with the map displayed on the liquid crystal display 15. It is possible to reliably specify the guidance target intersection.

Note that the present invention is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the scope of the present invention.
For example, in the present embodiment, the case where a vehicle is applied as a moving body has been described. However, any vehicle that moves on a road other than the vehicle can be applied.

  In the present embodiment, in S8 and S9, the maximum scale of the map that can display on the liquid crystal display 15 on one screen the intersection where the vehicle has passed and the guidance target intersection in front of the traveling direction of the vehicle is calculated, The map scale is changed and set to the calculated maximum scale, but the scale is such that the intersection where the vehicle has passed and the guidance target intersection ahead of the traveling direction of the vehicle can be displayed on the liquid crystal display 15 on one screen. If it is, it may not be the maximum scale. For example, the maximum scale may be changed to a scale reduced by 20%.

  In the present embodiment, the intersection with a signal is targeted as the intersection to be determined in S7 and S13. However, an intersection without a signal may be included in the target. Moreover, when guiding the number of intersections up to the guidance target intersection in S10, an intersection without a signal may be included in the target. Further, guidance may be performed by the number of traffic lights instead of the number of intersections.

1 Navigation device 13 Navigation ECU
15 Liquid crystal display 16 Speaker 41 CPU
42 RAM
43 ROM

Claims (6)

A guide route setting means for setting a guide route and a guidance target intersection on the guide route;
Current position acquisition means for acquiring the current position of the moving body;
Map display means for displaying a map around the moving body on a display device at a set scale;
Intersection information acquisition means for acquiring information about an intersection on the guide route;
An intersection passage determination means for determining whether or not the mobile body has passed the intersection based on the current position of the mobile body and information on the intersection acquired by the intersection information acquisition means;
When it is determined by the intersection passage determination means that the moving body has passed the intersection, the intersection where the moving body has passed and the guidance target intersection in front of the traveling direction of the moving body are displayed on one screen. A scale calculating means for calculating a map scale that can be displayed;
A route guidance device comprising scale changing means for changing a scale of the map displayed on the display device to the scale calculated by the scale calculating means. The intersection passage determining means determines whether or not the moving body has passed a predetermined number of intersections from the guidance target intersection that is ahead of the moving body in the traveling direction,
The scale calculation means calculates the scale when the intersection passage determination means determines that the moving body has passed a predetermined number of intersections ahead of the guidance target intersection that is ahead in the traveling direction of the moving body. The route guidance device according to claim 1, wherein:   The route guidance means, when the intersection passing judgment means determines that the moving body has passed the intersection, the guidance target intersection that is ahead of the moving body in the traveling direction from the intersection that the moving body has passed. The route guidance device according to claim 1 or 2, wherein the number of intersections up to the present is guided.   The route guidance means, when the intersection passing judgment means determines that the moving body has passed the intersection, the guidance target intersection that is ahead of the moving body in the traveling direction from the intersection that the moving body has passed. 4. The route guidance apparatus according to claim 3, wherein the number of intersections at which traffic lights are installed is guided among the intersections up to. A guide route setting step for setting a guide route and a guide target intersection on the guide route;
A current position acquisition step for acquiring the current position of the moving object;
A map display step of displaying a map around the moving body on a display device at a set scale;
An intersection information acquisition step of acquiring information about an intersection on the guide route;
An intersection passage determination step for determining whether or not the mobile body has passed through the intersection based on the current position of the mobile body and information on the intersection acquired by the intersection information acquisition step;
When it is determined in the intersection passage determination step that the moving body has passed the intersection, the intersection where the moving body has passed and the guidance target intersection that is ahead in the traveling direction of the moving body are displayed on one screen. A scale calculating step for calculating a map scale that can be displayed;
A scale changing step for changing a scale of the map displayed on the display device to the scale calculated by the scale calculating step. On the computer,
A guide route setting function for setting a guide route and a guide target intersection on the guide route;
A current position acquisition function for acquiring the current position of the moving object;
A map display function for displaying a map around the mobile body on a display device at a set scale;
An intersection information acquisition function for acquiring information about an intersection on the guide route;
An intersection passage determination function for determining whether or not the mobile body has passed the intersection based on the current position of the mobile body and information on the intersection acquired by the intersection information acquisition function;
When it is determined by the intersection passage determination function that the moving body has passed the intersection, the intersection where the moving body has passed and the guidance target intersection in front of the traveling direction of the moving body are displayed on one screen. A scale calculator that calculates the scale of the map that can be displayed;
A scale changing function for changing the scale of the map displayed on the display device to the scale calculated by the scale calculating function;
A computer program for executing

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