JP3874924B2 - Car navigation system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-vehicle navigation device that detects a current position of a vehicle and guides the vehicle to a destination.
[0002]
[Prior art]
The vehicle-mounted navigation device includes a map data storage device such as a CD-ROM or DVD-ROM (hereinafter simply referred to as “CD-ROM”) on which map data is recorded, a display device, a GPS (Global Positioning System) receiver, It has a sensor for detecting the current position and current direction of the vehicle, such as a gyro and a vehicle speed sensor, reads out map data including the current position of the vehicle from the map data storage device, and a map around the vehicle position based on the map data While drawing the image on the display screen, the vehicle position mark (location) is displayed superimposed on the display screen, the map image is scrolled and displayed as the vehicle moves, and the map image is fixed on the screen and the vehicle position mark is displayed. Or move it so that you can see at a glance where the vehicle is currently driving.
[0003]
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. Memorize it as a route and draw a guidance route on the map image with a different color from other roads and display it on the screen while driving, or a fixed distance to the intersection where the vehicle should change the route on the guidance route When the user approaches the inside, the user is guided to the destination by drawing an arrow indicating the route at the intersection where the route on the map image should be changed and displaying it on the screen.
[0004]
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 with the same distance, the cost differs depending on whether the user uses a toll road or not, whether to prioritize travel distance or travel time, etc. Become.
[0005]
Maps stored in a map data storage device such as a CD-ROM have the appropriate longitude and latitude width according to the scale level such as 1/12500, 1/25000, 1/50000, and 1/100000. The roads and the like are stored as coordinate sets of vertices (nodes) expressed by longitude and latitude. A road is formed by connecting two or more nodes, and a portion connecting two nodes is called a link. The map data includes (1) a road layer composed of a road list, a node table, and an intersection configuration node list, and (2) a background layer for displaying roads, buildings, facilities, parks, rivers, etc. on the map screen, (3) It consists of character / symbol layers for displaying characters such as administrative division names such as municipalities, road names, intersection names, building names, and map symbols.
[0006]
[Problems to be solved by the invention]
By the way, when there is sufficient time, it is convenient that a user such as a sightseeing spot automatically searches for a facility of interest before arriving at the destination.
From the above, the object of the present invention is to find a facility that the user is interested in among the facilities that exist between the destination and the vehicle that can efficiently visit each facility and search for a guidance route that reaches the destination. It is to provide a navigation device.
[0007]
[Means for Solving the Problems]
The above-described problem is a map in which map data is stored in an in-vehicle navigation device that searches a guidance route from a departure point to a destination and displays guidance information on the display along the guidance route to guide the vehicle to the destination. Data storage means, vehicle position detection means for detecting the current position of the vehicle, facility information storage means for storing the names and positions of a plurality of facilities classified by genre, and search area information for determining the search range of the facility search Search area information storage means for storing the genre designation information storage means for storing the specified genre, and the starting point and the destination based on the search area information stored in the search area information storage means. An elliptical search range having a straight line as a major axis is set, and a facility of the specified genre that exists within the search range is stored in the facility information storage unit. And a control means for searching from And specifying the desired arrival time at the destination, the control means calculates an expected arrival time at the destination, and when the estimated arrival time is earlier than the desired arrival time, And search for a facility of a genre designated in advance within an elliptical search range with a straight line including the destination as a major axis This is solved by an in-vehicle navigation device.
[0008]
The operation of the present invention will be described below.
In the present invention, the user's favorite genre is stored in the genre designation information storage means, and information for determining the search range is stored in the search area information storage means. When the departure place and the destination are set, the control means searches for facilities of genres that exist within the search range and are stored in the genre designation information storage means. Thereby, before arriving at the destination, the facility suitable for the detour is searched.
[0009]
In this case, it is preferable that the control unit calculates an estimated arrival time to arrive at the destination and displays it on the display.
In addition, when the desired arrival time to the destination is specified, the control means compares the expected arrival time with the desired arrival time, and searches for a facility of the user's favorite genre when the expected arrival time is early. May be.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
(First embodiment)
FIG. 1 is a block diagram showing an in-vehicle navigation device according to a first embodiment of the present invention.
[0011]
Reference numeral 1 denotes a CD-ROM storing map data. In addition to map data such as road layers, background layers, and character / symbol layers, the CD-ROM 1 records the names and positions of facilities classified by genre as a database. Has been. FIG. 2 is a schematic diagram showing a facility database stored in the CD-ROM 1. As shown in FIG. 2, in the database stored in the CD-ROM 1, facilities are classified for each genre. For each facility, the location data (longitude and latitude) of the facility and the required sightseeing time Is remembered.
[0012]
The genres of facilities stored in the CD-ROM 1 include, for example, amusement parks, golf courses, ski resorts, campsites, hot springs, famous places / historic sites and marina leisure facilities, halls, theaters, zoos, botanical gardens, aquariums, Museums and cultural facilities such as museums, highway interchanges, service areas, railway and subway stations, airports, transportation facilities such as ferry ports, administrative facilities such as government offices and police stations, hotels, department stores, hospitals and automobile sales There are shops. A genre for sightseeing such as a town suitable for eating and a hot spring that can be used for a day trip may be provided.
[0013]
Reference numeral 2 denotes an operation unit. The operation unit 2 includes various operation buttons for operating a navigation device main body 10 to be described later, such as a joystick used for moving the cursor and a “menu” button and a “decision” button. Is provided. A GPS receiver 4 receives a GPS signal sent from a GPS satellite and detects the longitude and latitude 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 liquid crystal display device, and the navigation device body 10 displays a map around the current position of the vehicle on the display device 7, guide routes from the departure point to the destination, vehicle position marks, and other guidance information. Is displayed. Reference numeral 8 denotes a speaker, and the navigation apparatus body 10 transmits various kinds of guidance information to the user through the speaker 8 by voice.
[0014]
The navigation device body 10 is composed of the following. A buffer memory 11 temporarily stores map data read from the CD-ROM 1. Reference numeral 12 denotes an interface connected to the operation unit 2, 14 denotes an interface connected to the GPS receiver 4, and 15 denotes an interface connected to the self-contained navigation sensor 5. Reference numeral 16 denotes a control unit. The control unit 16 detects the current position of the vehicle based on information input from the interfaces 14 and 15, and reads map data of a predetermined area from the CD-ROM 1 to the buffer memory 11. Or using the map data read out to the buffer memory 11, a guidance route from the departure point to the destination is searched.
[0015]
Reference numeral 17 denotes a genre / area setting storage unit. The genre / area setting storage unit 17 stores information on a favorite genre set by the user and information for setting a search area. These pieces of information are used when searching for a detour guide route to be described later.
A map drawing unit 18 generates a map image using the map data read out to the buffer memory 11. Reference numeral 20 denotes a guidance route storage unit that stores the guidance route searched by the control unit 16, and reference numeral 21 denotes a guidance route drawing unit that draws the guidance route. In the guide route storage unit 20, all nodes of the guide route searched by the control unit 16 are recorded from the departure point to the destination. When displaying the map, the guide route drawing unit 21 reads the guide route information (node sequence) from the guide route storage unit 20 and draws the guide route with a color and line width different from those of other roads.
[0016]
Reference numeral 19 denotes an operation screen / mark generation unit that generates various menu screens (operation screens) and various marks such as vehicle position marks and cursors in response to signals from the control unit 16.
Reference numeral 22 denotes an audio signal generator. A plurality of voice messages are recorded in the voice signal generation unit 22 in advance, and a predetermined voice message is output to the speaker 8 in accordance with a signal from the control unit 16.
[0017]
An image composition unit 23 superimposes various marks and operation screens generated by the operation screen / mark generation unit 19 and a guide route drawn by the guide route drawing unit 21 on the map image drawn by the map drawing unit 18. In addition, the image is displayed on the display device 7.
In the navigation device configured as described above, the control unit 16 detects the current position of the vehicle from the GPS signal received by the GPS receiver 4 and the signal input from the self-contained navigation sensor 5. Then, map data around the vehicle is read from the CD-ROM 1 and stored in the buffer memory 11. The map drawing unit 18 generates a map image based on the map data read into the buffer memory 11 and displays a map image around the vehicle on the display device 7.
[0018]
Moreover, the control part 16 detects the own vehicle position with the signal input from the GPS receiver 4 and the self-contained navigation sensor 5 with the movement of the vehicle, and displays the map image displayed on the display device 7 according to the result. The vehicle position mark is superimposed and displayed, and the vehicle position mark is moved as the vehicle moves, or the map image is scrolled.
Further, when the user operates the operation unit 2 to set the destination, the control unit 16 sets the map data in the CD-ROM 1 as the route with the lowest cost from the current location of the vehicle to the destination. Use to explore. Then, the route obtained by the search is stored in the guidance route storage unit 20 as a guidance route, and the guidance route is superimposed on the map image and displayed. Further, the control unit 16 appropriately outputs guidance information as the vehicle travels, and guides the vehicle to travel along the guidance route to the destination.
[0019]
When the user designates a detour guide route search, the control unit 16 uses the information stored in the genre / area setting storage unit 17 to search for detour destination candidates according to the user's preference. Then, when the user designates a desired facility as a detour destination from the detour destination candidates, a route having the lowest cost among the routes reaching the destination through the designated facility is searched for as a guide route.
[0020]
FIG. 3 is a flowchart showing the operation of the navigation device of this embodiment when searching for a detour guide route.
First, in step S11, the user sets a favorite genre and a search area as initial settings. These settings are made as follows.
When the user presses the “Menu” button on the operation unit 2, a main menu screen (not shown) is displayed on the display device 7. When “Set favorite genre” is selected from the main menu screen and the “OK” button of the operation unit 2 is pressed, the control unit 16 reads the database of facilities classified by genre from the CD-ROM 1 and displays the display device 7. For example, a screen as shown in FIG. 4 is displayed.
[0021]
In this screen, a “genre list” column 31 is displayed on the right side, and a “selected genre” column 32 is displayed on the left side. In the “genre list” column 31, a list of genres recorded on the CD-ROM 1 is displayed. Nothing is initially displayed in the “selected genre” column 32.
At the bottom of the screen, an “add” button 33a, an “end” button 33b, and a “delete” button 33c are displayed. When the joystick of the operation unit 2 is tilted left and right, the first cursor (thick frame line surrounding the button) 34 moves between the “add” button 33a, the “end” button 33b, and the “delete” button 33c.
[0022]
When the first cursor 34 is moved to the “add” button 33a on the screen shown in FIG. 4, a second cursor 35 (thick frame line surrounding the genre name) 35 is displayed in the “genre list” field 31. The cursor 35 moves the “genre list” field 31 up and down when the joystick of the operation unit 2 is tilted up and down. Further, when the cursor 35 is positioned at the lowest genre name displayed in the “genre list” column 31, when the joystick is further moved downward, the list scrolls to display the next genre name. Is done. When the desired genre is displayed in the “genre list” column 31 in this way and the “OK” button on the operation unit 2 is pressed, the genre name at the cursor position is displayed in the “selected genre” column 32. The
[0023]
When the first cursor 34 is moved to the “delete” button 33c on the screen shown in FIG. 4, the second cursor 35 moves to the “selected genre” column 32. When the joystick of the operation unit 2 is tilted up and down, the second cursor 35 moves up and down the “selected genre” column 32. When the second cursor 35 is placed on one of the genres displayed in the “selected genre” column 32 and the “OK” button on the operation unit 2 is pressed, the genre name at the cursor position is “ The selected genre is deleted from the column 32.
[0024]
In this way, when only a desired genre is set in the “selected genre” field 32, the first cursor 34 is set to the “end” button 33b and the “decision” button of the operation unit 2 is pressed, the control unit 16 stores the selected genre in the genre / area setting storage unit 17 and then displays the main menu on the display device 7.
When “search area setting” is selected on the main menu screen, a search area setting screen shown in FIG. 5 is displayed. In this screen, an ellipse indicating the shape of the search area and the oblateness of the ellipse (ratio of the major axis to the minor axis) are displayed. At the bottom of the screen, an “enlarge” button 36a, an “end” button 36b, A “reduce” button 36c is displayed. When the joystick is tilted left and right, the cursor (thick frame line surrounding the buttons) 37 moves between these buttons 36a to 36c.
[0025]
FIGS. 6A and 6B are schematic diagrams for explaining a search area setting method. In the present embodiment, when the starting point is point A and the destination is point B, the position A1 slightly outside the point A of the line segment connecting the points A and B is slightly outside the point B. An elliptical area having the long axis up to position B1 is set as a search area. Then, the ratio of the short axis to the long axis (referred to as flatness) is set to change the range of the search area. For example, when the flat rate is set to 30%, the search area is relatively narrow as shown in FIG. 6A, and when the flat rate is set to 60%, the search area is relatively small as shown in FIG. 6B. Become wider. The length between A1 and B1 is, for example, 1.1 times the length between A and B.
[0026]
In the screen shown in FIG. 5, when the cursor 37 is placed on the “enlarge” button 36 a and the “enter” button on the operation unit 2 is pressed, the flattening rate is enlarged by 5%, and the shape of the ellipse displayed accordingly is changed. Change. When the cursor 37 is placed on the “reduction” button 36 c and the “decision” button on the operation unit 2 is pressed, the flatness is decreased by 5% and the shape of the displayed ellipse is changed. After setting the desired flatness in this way, when the cursor 37 is set to the “Finish” button 36b and the “OK” button on the operation unit 2 is pressed, the control unit 16 sets the set flattening rate to the genre / area setting. After storing in the storage unit 17, the main menu is displayed on the display device 7.
[0027]
Note that the above initial setting only needs to be performed once, and step S11 can be omitted from the next time.
Next, in step S12, when the user selects “departure route search” from the main menu, a map is displayed on the display device 7 as shown in FIG. On this screen, the cursor 40 moves on the map by tilting the joystick. When the cursor 40 is set to a desired destination and the “OK” button on the operation unit 2 is pressed, the control unit 16 stores the cursor position as the destination.
[0028]
Thereafter, the process proceeds to step S13, in which the control unit 16 uses the current position of the vehicle as the starting point, a straight line passing through the starting point and the destination as a major axis, and an elliptical search area with a flat rate stored in the storage unit 17 On the map. Then, a facility database classified by genre stored in the CD-ROM 1 is used to search for facilities of the genre in the search area and stored in the storage unit 17.
[0029]
Next, the process proceeds to step S14, and the control unit 16 displays the found facility on the display device 7 as a detour candidate. FIG. 8 shows a screen display example after searching for a detour candidate. In the screen shown in FIG. 8, a column 41 of “depot candidate facilities” is displayed on the left side, and a list of all searched depot candidate facilities is displayed in this “depot candidate facility” column 41. . In addition, a “selected facility” column 42 is displayed on the right side of the screen, and the “selected facility” column 42 includes a facility designated as a destination by the user from the “facility candidate facility” column 41. Is displayed. Furthermore, an “add” button 43a, an “end” button 43b, a “change” button 43c, and a “delete” button 43d are displayed on the lower side of the screen. When the joystick is tilted to the left or right on this screen, the first cursor 44 (bold frame surrounding the button) 44 is between the “add” button 43a, “end” button 43b, “change” button 43c, and “delete” button 43d. To move.
[0030]
When the first cursor 44 is moved to the “Add” button 43a and the joystick is tilted up and down, the second cursor (thick frame line surrounding the facility name) 45 is moved up and down in the “facility candidate facility” field 41. Moving. If there are many searched facilities, the second cursor 45 is moved to the position of the lowest facility name displayed in the column 41 of “facility candidate”, and the joystick is further moved down to scroll the list. The next facility name is displayed.
[0031]
After displaying the facilities of the detour candidate in this way, in step S15, the user determines whether or not to search again for the detour candidate by changing the genre or area. When re-searching for a detour candidate, the cursor 44 is moved to the “change” button 43c and the “decision” button of the operation unit 2 is pressed. Thereby, the process proceeds to step S16, and the control unit 16 displays a screen (not shown) for selecting which of the genre and the area to change. When the user selects a genre, the process proceeds from step S16 to step S17. When the user selects an area, the process proceeds from step S16 to step S18.
[0032]
In step S17, a screen substantially similar to that shown in FIG. 4 is displayed, and a genre can be added or deleted. In step S18, a screen almost similar to that shown in FIG. 5 is displayed, and the area can be enlarged or reduced.
After changing the genre or the area in step S17 or step S18, the process proceeds to step S19, and the control unit 16 asks the user whether or not the change of the genre or area may be finished (not shown). ) Is displayed. If the user selects NO, the process returns from step S19 to step S16. When the user selects the end of the change, the process returns from step S19 to step S13, and the facility is searched again under the changed conditions. Then, the facility searched in step S14 is displayed as a detour candidate (see FIG. 8).
[0033]
In the screen shown in FIG. 8, if there is a facility that the user desires to take a detour in the “depot candidate facility” column 41, the process proceeds from step S 14 to step S 15 to step S 20 to select a depot destination facility. . That is, the user moves the second cursor 45 to a desired facility position by moving the joystick up and down by moving the first cursor 44 to the “add” button 43a on the screen shown in FIG. Then, when the “OK” button of the operation unit 2 is pressed, the facility name surrounded by the second cursor 45 is moved to the “selected facility” column 42. The user can also select a plurality of facilities. When the first cursor 44 is moved to the “delete” button 43d, the second cursor 45 moves to the “selected facility” column 42. Then, when the second cursor 45 is moved to a predetermined facility and the “OK” button of the operation unit 2 is pressed, the facility name surrounded by the second cursor 45 is moved to the “facility candidate facility” column 41. To do. In this way, after moving only the facility for which the user wants to take a detour to the “selected facility” column 42, the first cursor 44 is moved to the “end” button 43 b and “determine” of the operation unit 2 is selected. When the button is pressed, the control unit 16 sets the facility in the “selected facility” column 42 as a detour.
[0034]
When the user finishes specifying a desired side trip in this way, the process proceeds to step S21. In step S <b> 21, the map data is read from the CD-ROM 1 to the buffer memory 11 by the control unit 16. Then, the control unit 16 uses the map data read out to the buffer memory 11 to search for a guide route with the lowest cost among routes that reach the destination through the specified detour. In this case, the order of the detour destinations is changed, and a route that can stop at the facilities of each detour destination most efficiently is searched for as a guide route. Then, after storing the guidance route in the guidance route storage unit 20, the destination arrival prediction time when traveling along the guidance route is calculated and displayed on the display device 7. The predicted arrival time at the destination is obtained by adding the travel time of the vehicle and the stay time at the destination facility. The traveling time of the vehicle can be calculated by the control unit 16 by setting the average traveling speed of the vehicle in advance for each road type, for example. In addition, the staying time at the facility at the detour is the time (tourist time) stored in the database (see FIG. 2).
[0035]
In the present embodiment, as described above, when the user designates a desired genre in advance, the facility of the desired genre existing up to the destination is automatically searched. Further, when the user designates a stop-by destination from the searched facilities, an optimum guidance route that reaches the destination through the designated facilities is searched. As a result, the user can efficiently travel around facilities of a desired genre and arrive at the destination, and the usability of the navigation device is further improved.
[0036]
(Second Embodiment)
9 and 10 are flowcharts showing the operation of the in-vehicle navigation device according to the second embodiment of the present invention. In the present invention, the structure of the navigation device is basically the same as that of the first embodiment, and will be described with reference to FIG.
[0037]
First, in step S31, the user sets a favorite genre and search area (flat rate) as initial settings. These setting methods are the same as those in the first embodiment, and the set information is stored in the genre / area setting storage unit 17. This initial setting only needs to be performed once, and step S31 can be omitted from the next time.
[0038]
Next, in step S32, the user sets a destination and a desired arrival time (T0). Thereafter, the process proceeds to step S33, and the control unit 16 searches for a guidance route from the departure point to the destination using the map data stored in the CD-ROM 1 with the current position of the vehicle as the departure point.
Next, the process proceeds to step S34, and the control unit 16 calculates a destination arrival expected time T1 when traveling along the guidance route. For the calculation of the estimated arrival time T1, a preset average speed for each road type is used. Further, the estimated arrival time may be calculated based on traffic information transmitted from the outside of the vehicle via FM multiplex broadcasting, radio wave beacon or optical beacon.
[0039]
Next, the process proceeds to step S35, where the control unit 16 compares the expected arrival time T1 with the desired arrival time T0. If the estimated arrival time T1 is later than the desired arrival time T0, the process proceeds to step S36. If the estimated arrival time T1 is earlier than the desired arrival time T0, the process proceeds to step S37.
When the process proceeds to step S36, that is, when the vehicle cannot travel to the desired arrival time by traveling along the guide route, the control unit 16 determines the guide route searched for in step S33 and the desired arrival time T0 and The estimated arrival time T1 is displayed on the display device 7. Thereafter, the control unit 16 outputs guidance information to the display device 7 or the speaker 8 as the vehicle moves, and guides the vehicle to the destination along the guidance route.
[0040]
On the other hand, when the process proceeds to step S37, that is, when the vehicle can travel along the guidance route and can arrive at the destination earlier than the desired arrival time T0, the control unit 16 performs the genre area as in the first embodiment. The flat area search area stored in the setting storage unit 17 is set on the map. Then, a facility database classified by genre stored in the CD-ROM 1 is used to extract facilities in the genre that are in the search area and stored in the genre / area setting storage unit 17.
[0041]
Thereafter, the process proceeds to step S38, where the control unit 16 searches for a guidance route that goes to the destination through one of the extracted facilities (hereinafter referred to as the facility of interest), and in step S39, the expected arrival time T2 Calculate In this case, the estimated arrival time T2 is obtained by adding the sightseeing time of the facility included in the database to the traveling time when traveling from the departure point to the destination through the facility of interest.
[0042]
Next, the process proceeds to step S40, and the control unit 16 compares the estimated arrival time T2 with the desired arrival time T0. If the estimated arrival time T2 is before the desired arrival time T0, that is, if the destination can be reached before the desired arrival time T0 even if the target facility is detoured, the process proceeds to step S41 and the target facility is detoured. After making a candidate, the process proceeds to step S42. On the other hand, when the estimated arrival time T2 is later than the desired arrival time T0, the process directly proceeds from step S40 to step S42.
[0043]
In step S42, it is checked whether there is a facility that has not yet been selected as a facility of interest among the facilities extracted in step S37. If there is a facility, the process returns to step S38 to select one of the facilities as the facility of interest, and search for a guidance route and prediction of arrival. The time T2 is calculated and compared with the desired arrival time T0. If the expected arrival time T2 is earlier than the desired arrival time T0, the facility of interest is added as a detour candidate.
[0044]
In this way, after searching for guidance routes and calculating estimated arrival times for all the facilities extracted in step S37, the process proceeds to step S43.
In step S <b> 43, the control unit 16 displays a list of all the detour candidates and estimated arrival times on the display device 7. After that, in step S44, when the user selects a desired detour candidate, the selected detour candidate is set as a detour destination, and vehicle guidance is started along the guidance route toward the destination through the detour.
[0045]
In the present embodiment, for example, when having lunch at a point set as the destination, if the desired arrival time at the destination is set to 12:00, an appropriate detour is provided so that the destination can be reached around noon. Explore. Thereby, the usability of the navigation device is improved.
In the present embodiment, the description has been made in the case of searching for a detour between the current position of the vehicle and the destination, but other destinations (route points) are set up to the final destination. It can also be applied when searching for a detour between the current position of the vehicle and the other destination.
[0046]
【The invention's effect】
As described above, according to the present invention, the user's favorite genre is stored in the genre designation information storage means, and the information for determining the search range is stored in the search area information storage means. When the departure place and the destination are set, the control means searches for facilities of genres that exist within the search range and are stored in the genre designation information storage means. Thereby, the detour of the user's favorite genre is searched.
[0047]
In addition, when the desired arrival time to the destination is designated, the control means compares the expected arrival time with the desired arrival time, and searches for a facility of the user's favorite genre when the expected arrival time is early. Then, a guidance route that can detour to the facility of the user's favorite genre and arrive at the destination before a desired time is searched.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an in-vehicle navigation device according to a first embodiment of the present invention.
FIG. 2 is a schematic diagram showing a facility database stored in a CD-ROM;
FIG. 3 is a flowchart showing an operation when searching for a detour guide route of the navigation device of the first embodiment.
FIG. 4 is a diagram illustrating a screen display example when setting a favorite genre.
FIG. 5 is a diagram showing a screen display example when setting a search area.
FIG. 6 is a schematic diagram for explaining a search area setting method.
FIG. 7 is a diagram showing a screen display example at the time of destination grounding.
FIG. 8 is a diagram illustrating a screen display example after searching for a detour candidate.
FIG. 9 is a flowchart (No. 1) showing an operation of the in-vehicle navigation device according to the second embodiment of the present invention.
FIG. 10 is a flowchart (part 2) illustrating an operation of the vehicle-mounted navigation device according to the second embodiment of the present invention.
[Explanation of symbols]
1 CD-ROM,
2 Operation part,
4 GPS receiver,
5 Self-contained navigation sensors,
7 Display device,
8 Speaker,
10 Navigation device body,
11 Buffer memory,
12, 14, 15 interface,
16 control unit,
17 Genre / Area Setting Memory,
18 Map drawing part,
19 Operation screen / mark generator,
20 Guide route storage unit,
21 Guide route drawing unit,
23 Image composition unit.

Claims (3)

In a vehicle-mounted navigation device that searches for a guidance route from a departure place to a destination and displays guidance information on the display along the guidance route to guide the vehicle to the destination.
Map data storage means for storing map data;
Vehicle position detection means for detecting the current position of the vehicle;
Facility information storage means for classifying and storing names and positions of a plurality of facilities for each genre;
Search area information storage means for storing search area information for determining a search range for facility search;
Genre designation information storage means for storing a specified genre;
Based on the search area information stored in the search area information storage means, an elliptical search range having a long axis as a straight line including the starting point and the destination is set, and exists within the search range; Control means for searching for facilities of the designated genre from the facility information storage means,
When the desired arrival time at the destination is designated, the control means calculates an estimated arrival time at the destination, and when the estimated arrival time is earlier than the desired arrival time, the departure place and the destination A vehicle-mounted navigation device characterized by searching for a facility of a genre designated in advance among facilities existing within an elliptical search range having a straight line including the ground as a major axis .   The control means displays the searched facility on the display, and when a specific facility is specified among the facilities, the control unit searches for a route passing through the specified facility as the guide route. The in-vehicle navigation device according to Item 1.   The in-vehicle navigation device according to claim 2, wherein the control unit calculates an estimated arrival time for a vehicle to arrive at the destination and displays the estimated arrival time on the display.

Images