JP2006003328A - On-vehicle navigation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an "on-vehicle navigation system" not providing simply a route for returning a guide route but providing a route in response to an intention of a user, when a vehicle deviates from the guide route. <P>SOLUTION: A control part 17 provides guide information according to circumstances to make a vehicle travel along the guide route, searches a plurality of searched routes while changing searching conditions, when detecting the deviation of the vehicle from the guide route, and stores data of the searched routes in a guide route storage part 22. A guide route drawing part 23 displays the plurality of searched routes superposingly on a map image displayed in a display 7, based on the data of the searched routes stored in the guide route storage part 22. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle-mounted navigation device that searches for a guidance route to a destination and appropriately provides guidance information so that a vehicle travels along the guidance route.

  The in-vehicle navigation device includes a map data storage device such as a DVD (Digital Versatile Disk) or hard disk on which map data is recorded, a display device such as a liquid crystal panel, a gyro, a GPS (Global Positioning System) receiver, and a vehicle speed sensor. A vehicle position detection device that detects the current position of the vehicle and the direction of the vehicle is included. Then, the map data of the area including the current position of the vehicle is read from the map data storage device, and a map image around the current position of the vehicle is drawn based on the map data and displayed on the display device. Location) is superimposed on the map image, and the map image is scrolled according to the movement of the vehicle, the map image is fixed on the screen and the vehicle position mark is moved, and where the vehicle is currently traveling So that you can see at a glance.

  In general, the in-vehicle navigation device is equipped with a route guidance function that allows the user to easily travel to a desired destination without making a mistake on the road. According to this route guidance function, the lowest cost route connecting from the starting point to the destination using map data is automatically searched by performing simulation calculation such as horizontal search method or Dijkstra method, and the searched route is guided. It is memorized as a route, and when driving, the guidance route is displayed with a different color from other roads and drawn thickly, or when the vehicle approaches the intersection on the guidance route where it should turn right or left The user is guided to the destination by drawing an arrow indicating the course at the intersection on the map.

  Cost is based on distance, road width, road type (general road or highway, etc.), a value multiplied by a constant according to right turn and left turn, etc., estimated travel time of vehicle, etc. The degree of appropriateness as a numerical value. Even if there are two routes having the same distance, the cost differs depending on whether the user uses a toll road or whether to give priority to distance or time.

  In Japanese Patent Application Laid-Open No. 5-164666, a plurality of routes from a starting point to a destination are searched, for example, in ascending order of distance and average travel time, and these routes are displayed on the screen to guide the route selected by the user. A vehicle travel guidance device for setting a route is disclosed.

By the way, in a general in-vehicle navigation device, for example, when the user deviates from the guidance route by making a wrong place to turn right or left, an automatic reroute that automatically searches for a route to return to the guidance route and displays it on the screen. It has a function called. In this type of in-vehicle navigation device, guidance information is provided so that the vehicle returns to the guidance route along the route searched by the auto reroute function.
JP-A-5-164666

  As described above, the conventional general vehicle-mounted navigation device has an auto-reroute function that searches for and displays a route that returns to the guidance route when the vehicle deviates from the guidance route. However, the user may intentionally deviate from the guide route. In this case, even if a route that returns to the guide route is searched for and displayed, the information is unnecessary for the user. For example, even if the guidance route is about to enter the expressway soon, if there is enough time or the surrounding scenery is good, you may want to drive a little on the general road.

  In view of the above, an object of the present invention is to provide an in-vehicle navigation device that provides a route according to the user's intention rather than simply providing a route to return to the guidance route when the vehicle deviates from the guidance route. is there.

  The above-described problems include a vehicle position detection unit that detects the current position of the vehicle, a map data storage unit that stores map data, and a map image that is drawn and displayed based on the map data read from the map data storage unit. A map drawing unit to be displayed on the device, a guidance route storage unit, and a signal output from the vehicle position detection unit are input to control the map data storage unit, the map drawing unit, and the guidance route storage unit. When the ground is set, a guidance route from the current position of the vehicle to the destination is searched, and the guidance route stored in the guidance route storage unit is stored in the guidance route storage unit. A guidance route drawing unit that draws a guidance route based on the route data and displays the guidance route superimposed on the map image displayed on the display device, and the control unit is configured such that the vehicle travels along the guidance route. When the vehicle deviates from the guide route, the search condition is changed to search a plurality of search routes, the data of these search routes are stored in the guide route storage unit, and the guide route drawing is performed. The vehicle-mounted navigation device, wherein the unit displays a plurality of search routes on the map image displayed on the display device based on the search route data stored in the guidance route storage unit. To solve.

  There are cases where the vehicle deviates from the guidance route when a right turn or a left turn is mistaken and when the vehicle intentionally deviates from the guidance route and wants to travel on a route different from the guidance route. In the present invention, when the vehicle deviates from the guide route, the control unit searches for a plurality of search routes while changing the search conditions, and stores data of these search routes in the guide route storage unit. The guide route drawing unit draws the search route based on the search route data stored in the guide route storage unit, and displays it on the map displayed on the display device. This makes it possible to provide a route according to the user's intention and improve usability as compared with a conventional in-vehicle navigation device that simply provides a route to return to the guidance route.

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

  FIG. 1 is a block diagram showing a configuration of an in-vehicle navigation device according to an embodiment of the present invention.

  Reference numeral 1 denotes a DVD storing map data and the like. Map data stored on DVD1 is divided into longitude and latitude widths of appropriate size according to the scale level such as 1/12500, 1/25000, 1/50000, and 1/100000, etc. Is recorded as a coordinate set of vertices (nodes) expressed in latitude and longitude. A road is formed by connecting two or more nodes, and a portion connecting two nodes is called a link.

  Reference numeral 3 denotes an operation unit provided with operation buttons and the like for operating the navigation apparatus body 10 to be described later. In the present embodiment, the operation unit 3 includes a touch panel arranged on the front surface of the display device 7 to be described later. For example, when a user's finger touches a button displayed on the screen of the display device 7, a signal corresponding to the contact position is output from the touch panel to the navigation device body 10.

  A GPS receiver 4 receives a GPS signal transmitted from a GPS satellite and detects the latitude and longitude of the current position of the vehicle. Reference numeral 5 denotes a self-contained navigation sensor, and the self-contained navigation sensor 5 includes an angle sensor 5a such as a gyro that detects a vehicle rotation angle, and a travel distance sensor 5b that generates a pulse every certain travel distance.

  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, a guidance route from the departure point to the destination, a vehicle position mark, and others. The guide information of is displayed. Further, as shown in FIG. 2, a touch panel 3 a constituting a part of the operation unit 3 is arranged on the front surface of the display device 7. Reference numeral 9 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 is a DVD controller that reads map data from the DVD 1, and 12 is a buffer memory that temporarily stores map data read from the DVD 1. Reference numeral 13 denotes an interface connected to the operation unit 3, reference numeral 14 denotes an interface connected to the GPS receiver 4, and reference numeral 15 denotes an interface connected to the autonomous navigation sensor 5.

  Reference numeral 17 denotes a control unit constituted by a microcomputer. The control unit 17 detects the current position of the vehicle based on signals input from the interfaces 14 and 15, reads map data around the current position of the vehicle from the DVD 1 to the buffer memory 12, and reads the map data to the buffer memory 12. Various processes such as searching for a guidance route from the departure point to the destination using the map data are executed.

  A search condition storage unit 18 stores parameters used for cost calculation for each search condition. For example, when “route that gives priority to time” is set as the search condition, the control unit 17 reads the parameter of the search condition from the search condition storage unit 18 and sets the cost per unit distance to be lower for a road with a higher speed limit. The cost is calculated to determine the guidance route. Further, for example, when “route that gives priority to general roads” is set as the search condition, the control unit 17 reads the parameter of the search condition from the search condition storage unit 18 and sets the cost per unit distance of the toll road high. Then, the cost calculation is performed to determine the guidance route. Further, for example, when “route that prioritizes travel distance” is set as the search condition, the control unit 17 reads the parameters of the search condition from the search condition storage unit 18 and sets the cost per unit distance of each road to be the same. The cost is calculated to determine the guidance route. In the present embodiment, as described above, conditions such as “route that gives priority to time”, “route that gives priority to general roads”, and “route that gives priority to travel distance” are set as the search conditions for the guidance route search. Although it is possible, as a route search condition when the vehicle deviates from the guide route, in addition to the search condition similar to the guide route search, “route to return to guide route”, “route using the next expressway entrance” "And" a route passing through famous places / historic sites ", and the like, a unique search condition is prepared.

  A map drawing unit 19 draws a map image using the map data read out to the buffer memory 12.

  Reference numeral 21 denotes an operation screen / mark drawing unit for drawing various menu screens (operation screens) and various marks such as a vehicle position mark and a cursor according to the operation status.

  22 is a guide route storage unit that stores the guide route searched by the control unit 17, and 23 is a guide route drawing unit that draws the guide route. In the guide route storage unit 22, all nodes of the guide route searched by the control unit 17 are stored from the departure point to the destination. The guidance route drawing unit 23 reads the guidance route data (node string) from the guidance route storage unit 22 and draws it with a color and thickness different from those of other roads.

  An audio output unit 24 supplies an audio signal to the speaker 9 based on a signal from the control unit 17. An image composition unit 25 superimposes various marks and operation screens drawn on the operation screen / mark drawing unit 21 on the map image drawn on the map drawing unit 19 and a guidance route drawn on the guidance route drawing unit 23. And output to the display device 7.

  In the vehicle-mounted navigation device configured as described above, the control unit 17 detects the current position of the vehicle and the direction of the vehicle from the GPS signal received by the GPS receiver 4 and the signal input from the autonomous navigation sensor 5. Then, map data around the current position of the vehicle is read from the DVD 1 and stored in the buffer memory 12. The map drawing unit 19 draws a map image based on the map data read to the buffer memory 12 and displays a map image around the current position of the vehicle on the display device 7. Thereafter, the control unit 17 superimposes and displays a vehicle position mark indicating the current position of the vehicle on the map image, and moves the vehicle position mark on the map image as the vehicle moves or scrolls the map image. .

  When the user operates the operation unit 3 to set a destination, the control unit 17 searches for a guidance route from the departure point to the destination using the current position of the vehicle as a departure point, and the guidance route obtained by the search is displayed. Data is stored in the guide route storage unit 22. At this time, the user can set search conditions such as “route that gives priority to time”, “route that gives priority to general roads”, and “route that gives priority to travel distance”, and the initial setting when the user does not set search conditions The search route is searched using the following search conditions.

  The guide route drawing unit 23 draws the guide route based on the guide route data stored in the guide route storage unit 22 and displays the guide route on the map image of the display device 7. And the control part 17 outputs guidance information suitably with a driving | running | working of a vehicle, and guides a vehicle to drive | work along a guidance route to the destination.

  Hereinafter, in the vehicle-mounted navigation device of the present embodiment, the operation when the vehicle deviates from the guidance route will be described with reference to the flowchart shown in FIG. Here, it is assumed that the vehicle is guided along the guidance route searched under the search condition “route giving priority to time”.

  First, in step S11, the control unit 17 monitors whether or not the vehicle has deviated from the guidance route. FIG. 4 is a diagram illustrating an example of a screen displayed when the vehicle is traveling along the guidance route. As shown in FIG. 4, when the vehicle is traveling along a guidance route (a route indicated by a thick line in the figure), a vehicle position mark 30 is displayed on the guidance route. If it is determined in step S11 that the vehicle has deviated from the guidance route, the process proceeds to step S12. Here, as shown in FIG. 5, it is assumed that the vehicle turns left at an intersection to go straight and the vehicle deviates from the guidance route.

  In step S <b> 12, the control unit 17 searches for a plurality of routes by setting a plurality of search conditions, and temporarily stores data of the searched routes (hereinafter also referred to as a searched route) in the guidance route storage unit 22. To do. The guide route drawing unit 23 draws these search routes with different colors or line types based on the search route data stored in the guide route storage unit 22 and displays them on the screen of the display device 7. In this example, three search conditions are set as search conditions: “route to return to guide route”, “route using the next expressway entrance” and “route giving priority to general roads”. Assume that three routes have been searched accordingly.

  Note that the route search condition when the vehicle deviates from the guide route is preferably changed as appropriate according to the search condition at the time of the guide route search and the vehicle position. For example, when there is a vehicle near the expressway, the search condition is “route using the next expressway entrance” as described above. The search condition is “route through famous places / historic sites”.

  FIG. 6 is a diagram showing a screen display example when the three searched routes searched in this way are displayed on a map. In FIG. 6, a broken line indicates a route (original route) searched using “route returning to the guidance route” as a search condition, and a one-dot chain line is searched using “route using the next expressway entrance” as a search condition. A route (next IC) is shown, and a two-dot chain line shows a route (general road) searched using “a route prioritizing a general road” as a search condition. Further, the control unit 17 controls the operation screen / mark drawing unit 21 to display the route selection buttons 31 to 33 corresponding to each searched route on the screen.

  Next, the process proceeds to step S13, and the control unit 17 determines whether any one of the searched routes is selected. For example, when the user touches any one of the route selection buttons 31 to 33 displayed on the screen, the control unit 17 recognizes the route selected by the user according to a signal output from the touch panel 3a. To do. In this case, the process proceeds to step S18, and the selected route is determined as the guidance route. Then, the search route other than the search route determined as the guide route is deleted from the screen.

  On the other hand, when it is determined in step S13 that the search route is not selected, the process proceeds to step S14. In step S14, guidance information is output as appropriate according to the movement of the vehicle. For example, when the vehicle is running as shown in FIG. 6, a message such as “If you turn right at □□ intersection and turn right at □□ intersection, you will return to the original route (guidance route)” is output by voice. To do.

  Next, the process proceeds to step S15, and it is determined whether or not there is a route from which the vehicle has deviated in the searched route. If there is no route from which the vehicle has deviated, the process returns to step S13. If there is a route from which the vehicle has deviated, the process proceeds to step S16, and the search route from which the vehicle deviated is erased from the screen.

  For example, as shown in FIG. 7, when the vehicle deviates from the search route returning to the guide route, the line indicating the search route returning to the guide route is deleted and the corresponding “original route” is displayed as shown in FIG. The route selection button 31 is also deleted from the screen.

  Next, the process proceeds to step S17, and it is determined whether or not a plurality of search routes are displayed on the screen. When it is determined that a plurality of search routes are displayed on the screen, the process returns to step S13. When it is determined that only one search route is displayed, the process proceeds to step S18, and the remaining search route is set as a guide route. Determine.

  For example, as shown in FIG. 9, the vehicle is searched using a route (next IC) searched using “the route using the next expressway entrance” as a search condition and a “route prioritizing a general road” as a search condition. If you proceed to the searched route (next IC) using the “route using the next expressway entrance” as a search condition at the branch point with the route (ordinary road), “route that gives priority to ordinary roads” The route (general road) searched using as a search condition is deleted from the screen, and the number of searched routes becomes one. In this case, in step S18, the route (next IC) searched using “the route using the next highway entrance” as a search condition is determined as the guidance route. The route selection buttons 32 and 33 displayed on the screen are also deleted.

  Thereafter, the control unit 17 appropriately provides guidance information as the vehicle moves so that the vehicle travels along the guidance route.

  Next, the operation when the vehicle deviates from the guidance route when the vehicle is guided along the guidance route searched under the search condition of “route that gives priority to general roads” is also the flowchart shown in FIG. The description will be given with reference.

  First, in step S11, the control unit 17 monitors whether or not the vehicle has deviated from the guidance route. When the vehicle is traveling along the guidance route, the vehicle position mark 30 is displayed on the guidance route (the route indicated by the bold line in the figure) as shown in the screen display example of FIG.

  If the control unit 17 determines in step S11 that the vehicle has deviated from the guidance route, the process proceeds to step S12. Here, as shown in FIG. 11, it is assumed that the vehicle goes straight at the intersection to be turned left and the vehicle deviates from the guidance route.

  In step S12, the control unit 17 searches for a plurality of routes by setting a plurality of search conditions in consideration of the search conditions at the time of destination setting and the current position of the vehicle, and the searched routes (search routes) are guided routes. The data is temporarily stored in the storage unit 22. The guide route drawing unit 23 draws these search routes with different colors or line types based on the search route data stored in the guide route storage unit 22 and displays them on the screen of the display device 7. In this example, three conditions are set as search conditions: “route to return to guidance route”, “other route that gives priority to general roads”, and “route that gives priority to time (highway)”. Assume that three routes have been searched accordingly.

  FIG. 12 is a diagram showing a screen display example when the three searched routes searched in this way are displayed on a map. In FIG. 12, a broken line indicates a route (original route) searched using “the route to return to the guidance route” as a search condition, and an alternate long and short dash line indicates a route searched using “another route prioritizing a general road” as a search condition ( A two-dot chain line indicates a route (highway) searched using “a route prioritizing time (highway)” as a search condition. The control unit 17 controls the operation screen / mark drawing unit 21 to display the route selection buttons 31 to 33 corresponding to each searched route on the screen. In this example, the route searched for “the route that gives priority to general roads” does not match the guide route that was searched first for general roads, but this is the difference between the current position of the vehicle at that time and the destination. This is because a new general road priority guidance route different from the first one has been searched.

  Next, the process proceeds to step S13, and the control unit 17 determines whether any one of the searched routes is selected. When the user touches any one of the route selection buttons 31 to 33 on the screen, the control unit 17 recognizes the route selected by the user based on a signal from the touch panel 3a. Then, the process proceeds to step S18, and the selected route is determined as the guidance route.

  On the other hand, when it is determined in step S13 that the search route is not selected, the process proceeds to step S14. In step S14, guidance information is output as appropriate according to the movement of the vehicle. For example, as shown in FIG. 12, when the vehicle is traveling, a message such as “If you turn left at approximately XXm ahead, Δ △ intersection is the original route, another route direction” is output by voice.

  Next, the process proceeds to step S15, and it is determined whether or not there is a route from which the vehicle has deviated in the searched route. If there is no route from which the vehicle deviates in the searched route, the process returns to step S13. In step S15, if there is a route from which the vehicle has deviated, the process proceeds to step S16. For example, if the vehicle turns left as shown in FIG. 13 and deviates from the searched route passing through the expressway, as shown in FIG. The route on which the vehicle deviates (highway) and the corresponding route selection button 33 are deleted from the screen.

  Next, the process proceeds to step S17, and it is determined whether or not a plurality of search routes are displayed on the screen. When it is determined that a plurality of search routes are displayed on the screen, the process returns to step S13. When it is determined that only one route is displayed, the process proceeds to step S18, and the remaining search route is determined as the guidance route. To do.

  For example, as illustrated in FIG. 15, a route (another route) searched for using a “route that gives priority to a general road” as a search condition and a route (original source) searched using a “route returning to a guide route” as a search condition. If the route is searched at a branch point (route that gives priority to general roads) at the branch point to the route (another route), the route and route searched using the route to return to the guide route as the search condition The selection buttons 31 and 32 are deleted from the screen. In step S18, the searched route (another route) is determined as a guide route using “a route prioritizing a general road” as a search condition.

  As described above, in this embodiment, when the vehicle deviates from the guidance route, not only the route that returns to the guidance route is searched, but also the search conditions at the time of the guidance route search at the departure point and the current position of the vehicle. A plurality of routes (search routes) are searched under the corresponding search conditions, and these search routes are displayed on the screen. Therefore, the user only has to select the optimum route according to the cause of the departure from the guidance route, and the user-friendliness of the in-vehicle navigation device is greatly improved as compared with the conventional case.

  In the above embodiment, the case where the user can select a desired search route from a plurality of search routes using the touch panel has been described. For example, in a vehicle-mounted navigation device having a voice input function, a search route is specified by voice. You may make it do.

FIG. 1 is a block diagram showing a configuration of an in-vehicle navigation device according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a touch panel disposed on the front surface of the display device. FIG. 3 is a flowchart showing the operation of the in-vehicle navigation device according to the embodiment of the present invention when the vehicle deviates from the guidance route. FIG. 4 is a diagram illustrating an example of a screen displayed when the vehicle is traveling along the guidance route. FIG. 5 is a diagram showing that the vehicle has left the guidance route by making a left turn at an intersection to go straight on. FIG. 6 is a diagram illustrating a display example of a screen when three searched search routes are displayed on a map. FIG. 7 is a diagram showing that the vehicle has deviated from the route returning to the guidance route. FIG. 8 is a diagram showing a display example of a screen when the line indicating the route returning to the guidance route is deleted and the corresponding “original route” route selection button is deleted. FIG. 9 is a diagram illustrating a screen display example indicating that the number of search routes has become one as the vehicle moves. FIG. 10 is a diagram illustrating another example of a screen displayed when the vehicle is traveling along the guidance route. FIG. 11 is a diagram showing that the vehicle has deviated from the guidance route by going straight at the intersection to be turned left. FIG. 12 is a diagram showing another display example of the screen when the three searched search routes are displayed on the map. FIG. 13 is a diagram illustrating that the vehicle deviates from a route passing through the highway. FIG. 14 is a diagram showing another display example of the screen when the route passing through the expressway and the corresponding route selection button are deleted from the screen. FIG. 15 is a diagram illustrating another display example indicating that the number of search routes has become one as the vehicle moves.

Explanation of symbols

1 ... DVD,
3 ... operation part,
3a ... touch panel 4 ... GPS receiver,
5 ... Self-contained navigation sensor,
7 ... display device,
9 ... Speaker,
10 ... navigation device body,
12 ... Buffer memory,
17 ... control part,
18 ... Search condition storage unit,
19 ... Map drawing part,
21. Operation screen / mark drawing section,
22 ... guide route storage unit,
23: Guide route drawing unit,
24. Audio output unit,
25. Image composition unit,
31-33 ... Route selection buttons.

Claims (6)

A vehicle position detector for detecting the current position of the vehicle;
A map data storage unit for storing map data;
A map drawing unit for drawing a map image based on the map data read from the map data storage unit and displaying the map image on a display device;
A guide route storage unit;
A signal output from the vehicle position detection unit is input to control the map data storage unit, the map drawing unit, and the guide route storage unit, and when a destination is set, the current position of the vehicle to the destination is set. A controller that searches for a guide route and stores data of the guide route in the guide route storage unit;
A guide route drawing unit for drawing a guide route based on the data of the guide route stored in the guide route storage unit and displaying the guide route superimposed on the map image displayed on the display device;
The control unit provides guidance information so that the vehicle travels along the guidance route, and when the vehicle deviates from the guidance route, searches for a plurality of search routes by changing a search condition, and data of the search routes Is stored in the guide route storage unit,
The guide route drawing unit displays a plurality of search routes in a superimposed manner on a map image displayed on the display device based on the search route data stored in the guide route storage unit. Car navigation system.   When the control unit detects that the vehicle has deviated from any one of the plurality of search routes while the plurality of search routes are displayed on the display device, the vehicle has deviated. The in-vehicle navigation device according to claim 1, wherein the search route is erased from the display device.   The in-vehicle system according to claim 1, wherein when any one of the plurality of search routes is specified, the control unit deletes a search route other than the specified search route from the display device. Navigation device.   4. The vehicle-mounted navigation device according to claim 1, wherein at least one of the searched routes is a route that returns to the guidance route. 5.   4. The control unit according to claim 1, wherein the control unit provides guidance information when the vehicle is traveling along at least one of the plurality of search routes. 5. The in-vehicle navigation device described.   The vehicle-mounted navigation device according to any one of claims 1 to 3, further comprising a touch panel disposed on a front surface of the display device.

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