JP2011179844A - Navigation system, navigation device, and server device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To guide a vehicle to a destination along an optimum route even if the latest map data about a road related to a route to the destination is not stored in a navigation device. <P>SOLUTION: A navigation device transmits information about the update state of map data stored in the navigation device and information about an own-vehicle position and the destination to a navigation server. The navigation server searches for a recommended route to the destination from the transmitted own-vehicle position as a start place by using the latest map data. The navigation server extracts, as deficiency information, information about a node which is on the recommended route and for which the latest data are not stored in the navigation device on the basis of information about the update state of the map data, and transmits it toe with the recommended route to the navigation device. The navigation device prepares a simplified map 600 on the basis of the deficiency information to guide the vehicle when passing through a place indicated by the node included in the deficiency information. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle navigation system, and a navigation device and a server device used in the navigation system.

  Conventionally, the destination and waypoints are transmitted from the navigation device to the traffic information center outside the navigation device, and the traffic information center receives the recommended route searched with traffic information and the like, and based on the received recommended route A navigation device for guiding a vehicle is disclosed (for example, Patent Document 1).

JP 11-101649 A

  In a navigation system including a navigation device and a traffic information center disclosed in Patent Document 1, a navigation server in the traffic information center or the like searches for a recommended route based on the latest map data. However, the map data stored in the navigation device may not be updated to the latest one. In that case, the recommended route searched based on the latest map data cannot be handled, and the vehicle may not be accurately guided to the destination.

A navigation system according to the present invention is mounted on a vehicle and a server device that stores first map data, and guides the vehicle from a starting point to a destination by using second map data different from the first map data. A navigation system including: a navigation device, wherein the server device searches for a route from the departure place to the destination based on the first map data, and information on the route searched by the route search means. Information from the first map data as the shortage information, and the route information transmitting means for transmitting the information to the navigation device, and the information regarding the difference between the first map data and the second map data in the route. A deficient information extracting means for extracting, and a deficient information transmitting means for transmitting the deficient information extracted by the deficient information extracting means to the navigation device. The navigation device includes route information receiving means for receiving route information transmitted from the server apparatus, insufficient information receiving means for receiving insufficient information transmitted from the server apparatus, and insufficient information received by the insufficient information receiving means. And a simple map creation means for creating a simple map of the difference portion, and when the vehicle passes through a place corresponding to the difference portion of the route, the vehicle is guided using the simple map, and the difference portion of the route When a vehicle passes through a place that does not correspond to the vehicle, vehicle guidance means for guiding the vehicle based on route information without using a simple map is provided.
The navigation device according to the present invention can communicate with the server device storing the first map data, is mounted on the vehicle, and uses the second map data different from the first map data to move the vehicle from the departure place. A navigation device for guiding to a destination, between route information receiving means for receiving information on a route from the departure point to the destination from the server device, and between the first map data and the second map data of the route Insufficient information receiving means for receiving from the server device the shortage information regarding the difference part having a difference in information, and a simple map creating means for creating a simple map of the difference part based on the shortage information received by the shortage information receiving means, When a vehicle passes a point corresponding to a different part of a route, the vehicle is guided using a simple map, and a vehicle passes a point not corresponding to the different part of the route , In which and a vehicle guidance means for guiding the vehicle based on the information of the route without using the simple map.
A server device according to the present invention is a server device that stores first map data and is communicable with a navigation device mounted on a vehicle, and is based on the first map data from a departure point of the vehicle to a destination. Route search means for searching for a route up to, route information transmission means for transmitting information of the route searched for by the route search means to the navigation device, first map data of the route and the first stored in the navigation device The shortage information extracting means for extracting the information regarding the difference portion having information difference between the second map data as the shortage information from the first map data, and the shortage information extracted by the shortage information extracting means to the navigation device Short information transmitting means for transmitting.

  According to the present invention, the vehicle can be guided to the destination according to the recommended route even if the latest map data for the road related to the route to the destination is not stored in the navigation device.

1 is a configuration diagram of a navigation system according to an embodiment of the present invention. It is a block diagram which shows the structure of the navigation apparatus used for the navigation system which is one Embodiment of this invention. It is a figure for demonstrating the node and link in map data. It is an example of the data showing the node contained in map data. This is an example when the map data stored in the navigation device 1 is not the latest. It is an output example when a navigation apparatus guides a vehicle, and uses a simple map. It is a flowchart of the process which the navigation system by one Embodiment of this invention performs in order to guide a vehicle. It is a flowchart of the process which the navigation apparatus by one Embodiment of this invention performs in order to guide a vehicle.

  A configuration of a navigation system according to an embodiment of the present invention is shown in FIG. This system includes a navigation device 1 and a navigation server 4 mounted on the vehicle 100. The navigation device 1 is connected to the communication terminal 2 by wire or wireless. The communication terminal 2 and the navigation server 4 are connected to the communication line network 3.

The navigation device 1 and the navigation server 4 store map data.
The map data of the navigation device 1 can be updated at an arbitrary timing according to the user's operation, but is not necessarily the latest. The navigation server 4 has a map database 41 in which all the latest map data and the old version of map data up to the latest map data are stored.

  The navigation server 4 can perform a route search based on the latest map data, and can transmit a recommended route, which is a result of the search, to the navigation device 1 via the communication network 3 described later. The navigation device 1 can guide the vehicle 100 to the destination based on the received recommended route. In addition, when the map data of the navigation device 1 is not up-to-date, the navigation server 4 displays information (hereinafter referred to as “insufficient information”) that is insufficient for the navigation device 1 to provide guidance based on the recommended route. Can be sent to. A method for determining whether the map data of the navigation device 1 is the latest and the content of the shortage information will be described later.

  The communication terminal 2 performs wireless connection with the communication line network 3 as necessary under the control of the navigation device 1. A navigation server 4 is connected to the communication network 3. That is, the navigation device 1 is connected to the navigation server 4 via the communication terminal 2 and the communication line network 3. When the communication terminal 2 and the communication line network 3 are wirelessly connected, a radio base station (not shown) included in the communication line network 3 is used. The wireless base stations can wirelessly communicate with the communication terminals 2 in a predetermined communication area around the wireless base stations, and are scattered throughout the country. The communication terminal 2 is a mobile phone, for example. The communication network 3 is constructed by, for example, a mobile phone network or the Internet.

  Next, the configuration of the navigation device 1 will be described. FIG. 2 is a block diagram showing the configuration of the navigation device 1. In the block diagram of FIG. 2, the navigation device 1 includes a control unit 10, a gyro sensor 11, a vehicle speed sensor 12, a hard disk drive (HDD) 13, a GPS (Global Positioning System) receiving unit 14, a display monitor 15, an input device 16, and a speaker. 17 is provided.

  The control unit 10 includes a microprocessor, various peripheral circuits, a RAM, a ROM, and the like, and executes various processes based on a control program and map data recorded in the HDD 13. Various processes for guiding the host vehicle, that is, the vehicle 100 to the destination are executed by the control unit 10. For example, destination search processing when setting the destination, detection processing of the current vehicle position, that is, the current position of the vehicle 100, various image display processing, voice output processing during route guidance, and the like are executed.

  The communication terminal 2 is connected to the control unit 10. Various information transmitted from the navigation server 4 in FIG. 1 is received by the navigation device 1 by being output to the control unit 10 via the communication terminal 2.

  The gyro sensor 11 is a sensor for detecting the angular velocity of the vehicle 100. The vehicle speed sensor 12 is a sensor for detecting the vehicle speed of the vehicle 100. By detecting the motion state of the vehicle 100 at predetermined time intervals using these sensors, the control unit 10 obtains the movement direction and the movement amount of the vehicle 100.

  The HDD 13 is a non-volatile recording medium in which a control program, map data, audio data, and the like for executing the above-described processing in the control unit 10 are recorded. The conventional map data recorded in the HDD 13 can be updated at any timing by the user. This update of the map data can be performed, for example, by downloading updated map data based on the latest map data from the navigation server 4. Alternatively, the map data may be updated by reading the updated map data from a recording medium such as a memory card or DVD-ROM in which the updated map data is recorded. Such update of the map data may be performed partially or in units of a predetermined region.

  In the above description, the map data is recorded on the HDD 13 in the navigation device 1. However, these may be recorded on a recording medium other than the HDD. For example, map data recorded on a CD-ROM, DVD-ROM, memory card, or the like can be used. That is, the navigation device according to the present embodiment may store these data using any recording medium.

  The GPS receiver 14 receives a GPS signal transmitted from a GPS satellite and outputs it to the controller 10. The GPS signal includes information on the position and transmission time of the GPS satellite that transmitted the GPS signal as information for determining the position of the vehicle 100. Therefore, by receiving GPS signals from a predetermined number or more of GPS satellites, the vehicle position can be calculated by the control unit 10 based on these pieces of information. Based on the calculation result of the vehicle position based on the GPS signal and the calculation result of the moving direction and the movement amount based on the detection results of the gyro sensor 11 and the vehicle speed sensor 12 described above, the vehicle position is detected every predetermined time. .

  The display monitor 15 is a device for performing various screen displays in the navigation device 1 and is configured using a liquid crystal display or the like. The display monitor 15 displays a map screen and the like. The contents of the screen displayed on the display monitor 15 are determined by screen display control performed by the control unit 10. The display monitor 15 is installed at a position where the user can easily see, for example, on the dashboard of the vehicle 100 or in the instrument panel.

  The input device 16 is a device for a user to perform various input operations for operating the navigation device 1, and has various input switches. The user operates the input device 16 to input, for example, the name of a facility or point desired to be set as a destination, select a destination from registered locations registered in advance, or display a map in an arbitrary direction. Or scroll. The input device 16 can be realized by an operation panel, a remote controller, or the like. Alternatively, the input device 16 may be realized by a touch panel integrated with the display monitor 15.

  The speaker 17 outputs sound based on the sound signal output from the control unit 10. When guiding the vehicle 100 by voice, the control unit 10 reads voice data from the HDD 13 and outputs a voice signal corresponding to the voice data to the speaker 17.

  In the map data recorded in the HDD 13 of the navigation device 1 and the navigation server 4, each road is represented by being divided into predetermined road sections. Each of these road sections is called a link. That is, in the map data, each road is composed of a plurality of links. The relationship between the road map and the link will be described with reference to FIG. 3 (a) and FIG. 3 (b). FIG. 3A is an example of a road map. FIG. 3B divides the road of FIG. 3A into six road sections, which are links L1 to L6.

  In map data, there is a point called a node at the end of the link. For example, in the example of FIG. 3B, there are a node N1 and a node N2 at the end of the link L1. Further, there are a node N2 and a node N3 at the end of the link L2. At the end of the link L3, there are a node N3 and a node N4. At the end of the link L4, there are a node N4 and a node N5. At the end of the link L5, there are a node N2 and a node N5. At the end of the link L6, there are a node N5 and a node N6.

  A node represents a point such as an intersection on a road map. A plurality of links sharing a node represents that the plurality of links are connected by the shared node, and represents a connection of roads. For example, link L1 and link L2 in FIG. 3B are connected by sharing node N2.

  The recommended route searched by the control unit 10 is represented as a sequence of nodes existing between the departure point and the destination. For example, in the case of the route P1 passing through the node N1, the node N2, and the node N5 in this order, it can be represented by a column (N1, N2, N5).

  In map data, data representing a node (hereinafter referred to as node data) is connected to a node ID 400, a point name 401, node point coordinates 402, which are coordinates on the map, and a node as shown in FIG. Information including the number of connected roads 403 that is the number of roads that are present and the connected road direction 404 that is the direction in which the road extends from the node is stored.

  In the map data, the data representing the link stores information such as the time required to pass the road represented by the link, the length of the road, and the direction of passage. The navigation server 4 searches for a recommended route that can reach the destination fastest based on such information, weather information, traffic information, and the like.

  The data representing the recommended route in the present embodiment is represented as a column of information 400 relating to the node ID of the node existing between the departure point and the destination among the node data shown in FIG. Can do. For example, the recommended route P1 in FIG. 3B can be represented as a column of node IDs 400 as shown in FIG.

  The data representing the recommended route searched by the navigation server 4 is a collection of information for referring to the data of the nodes and links, and the information for referring to the data is arranged in the order of passing from the departure place to the destination. Shall be. The navigation device 1 refers to the node and link data from the map data stored in the HDD 13 based on the information transmitted as the recommended route, and obtains information necessary for guiding the vehicle 100.

  When map data is updated, node data may be added, changed, or deleted. For example, when a new road is opened, a link and a node representing the road are added. In addition, for existing roads that connect to new roads, it is necessary to change the number of connected roads to the nodes at the intersections where the roads are connected, or to add data for connecting road directions. .

  If the map data stored in the navigation device 1 is not updated to the latest one, it may happen that the recommended route searched by the latest map data cannot be displayed. For example, it is assumed that FIG. 5A is based on the latest map data, and the link L5 is added in the past update. At this time, if the map data stored in the navigation device 1 is not the latest, the link L5 may not exist as shown in FIG. At this time, it is assumed that the navigation server 4 performs a route search using the map data of FIG. 5A and transmits the searched recommended route P1 to the navigation device 1. At that time, the navigation device 1 cannot display the road corresponding to the link L5. Then, when the vehicle is traveling on the road represented by the link L5, there may be a problem that the vehicle is displayed as traveling on a place other than the road or displayed as traveling on a different road.

  When the navigation device 1 requests the recommended route information from the navigation server 4, the navigation device 1 transmits information representing the update status of the map data stored in the navigation device 1. Thereby, the navigation server 4 can discriminate | determine the information (insufficient information) which is insufficient in order for the navigation apparatus 1 to guide the vehicle 100 correctly according to the searched recommended route. The navigation server 4 transmits the determined lack information to the navigation device 1. For example, in the examples of FIGS. 5A and 5B described above, the number of roads between the map data stored in the navigation device 1 and the latest map data among the nodes through which the recommended route P1 passes. Node data of nodes N2 and N5, which are nodes having different road direction contents, are transmitted as insufficient information. The information indicating the update status of the map data may be, for example, version information of the map data or the last update date. In the following description, these are referred to as map update status information.

  The shortage information transmitted by the navigation server 4 to the navigation device 1 may be in a data format as shown in FIG. FIG. 5C shows the shortage information related to the recommended route P1 as an example. The data format of the shortage information does not need to include all the data included in the node data, and may include information necessary to display the road. The data format illustrated in FIG. 5C includes a node ID 400, a point name 401, node point coordinates 402 that are coordinates on the map, the number of connected roads 403, and a connected road direction 404. Information regarding the nodes included in the shortage information is arranged in the order of the nodes passing between the departure point and the destination in the recommended route.

  When the shortage information is transmitted from the navigation server 4, the navigation device 1 creates a simple map based on the shortage information. Then, by guiding the vehicle 100 using the created simple map, it is complemented that the map data is not updated to the latest. That is, from the navigation server 4, the information regarding the difference between the map data of the navigation device 1 and the latest map data stored in the navigation server 4 among the recommended routes searched by the navigation server 4 is used as missing information. Receive. By creating a simple map based on this shortage information and guiding the vehicle, even if the latest map data is not stored in the navigation device 1 for the road related to the route to the destination, the vehicle 100 according to the recommended route. To the destination. An example of a simple map created by the navigation device 1 is shown in FIG.

  FIG. 6A shows the display monitor 15 when the navigation device 1 stores the map data of FIG. 5B and the vehicle 100 equipped with the navigation device 1 passes through a point corresponding to the node N2. It is an example of the screen displayed. In FIG. 6A, the screen of the display monitor 15 is divided into three, and a simple map 600, an entire map 601 and a spot name display 602 are displayed. The entire map 601 is a display (north-up display) in which north is directed upward on the screen based on the map data stored in the navigation device 1, and a vehicle mark 650 representing the position of the vehicle 100 is superimposed. It is displayed.

  In the overall map 601, roads corresponding to the links L 1, L 2, L 3, L 4, and L 6 in FIG. 5 are displayed based on the map data of the navigation device 1. On the other hand, the road 652 corresponding to the link L5 is displayed based on the node data included in the shortage information and the data representing the recommended route.

  The process of displaying the road 652 is performed as follows, for example. First, the control unit 10 searches for deficient information using the node number of a node (for example, the node N1) representing the departure place as a key in the data (for example, FIG. 4B) representing the recommended route. At this time, if the node representing the departure place is a node included in the shortage information, it is determined that there is a possibility that the map data stored in the navigation device 1 on the road extending from the node cannot be correctly displayed. The control unit 10 repeats such a search according to the order of data representing the recommended route (the order of the nodes passing through the recommended route). When it is continuously determined that the nodes are included in the shortage information, a straight line is drawn as a road between the node point coordinates of the two nodes. For example, in the case of the recommended route in FIG. 4B, since the node data of the nodes N2 and N5 are continuously included in the shortage information (FIG. 5C), the continuous two as shown in FIG. 6A. A road 652 is drawn between the node point coordinates of the two node data. The road displayed based on such shortage information preferably has a display mode such as a display color different from that of other roads as shown in FIG.

  The point name display 602 in FIG. 6A displays the point name 401 of the node N2 represented by the node data shown in FIG. 4 as “◯ △ □ intersection” in the shortage information.

  The simplified map 600 in FIG. 6A is a display (heading-up display) in which the traveling direction of the vehicle 100 is the upper direction of the screen, and FIG. 4 of the shortage information centering on the place represented by the node N2. Three roads are displayed based on the number of connected roads 403 and the connected road direction 404 of the node N2 represented by the node data shown in FIG. In FIG. 6A, a vehicle mark 650 and an arrow 651 indicating a route are displayed superimposed on the simple map 600.

  As described above, the directions of the three roads displayed on the simple map 600 are determined based on the connection road direction 404 stored in the node data and the traveling direction of the vehicle 100. The relationship between the traveling direction of the vehicle 100 and the connecting road direction 404 in FIG. 6A is as shown in FIG. As shown in the overall map 601 of FIG. 6A, the vehicle 100 is traveling toward the northeast (315 °). At this time, north (0 °) in FIG. 6B is the direction of the arrow 671. The directions in which the road extends from the node N2 are directions of “0 °”, “135 °”, and “270 °” as shown in the connection road direction 404 of FIG. When the direction of the arrow 671 is north (0 °) and the road is extended from the node N2 in three directions of “0 °”, “135 °”, and “270 °”, the directions coincide with the directions indicated by the arrows 671 to 673, respectively. To do. Therefore, in FIG. 6A, roads are displayed in the directions of the arrows 671 to 673.

  If the node data includes information such as the road width and the number of lanes, the road width may be changed on the simplified map. Also, in the simple map 600, as in the case of the entire map 601, the display mode of the road displayed based on the shortage information may be different from other roads.

  In the above explanation, an example in which a link was added in the latest map data was explained. However, for example, when a link is deleted due to abolition of a road or a point name is changed, The shortage information may be communicated from the navigation server 4 to the navigation device 1 to guide the vehicle using a simple map. Also in this case, as described above, in the entire map or the simple map, either the road displayed based on the shortage information, that is, any one of the map data stored in the latest map data HDD 13 stored in the navigation server 4 is displayed. For roads included only in the road, the display mode such as the display color may be different from those of other roads. The determination of the road included in only one of the map data stored in the latest map data HDD 13 stored in the navigation server 4 is performed by comparing information such as the number of connected roads and the connected road direction included in the node data. Can be executed.

  Next, a route guidance method in the navigation system of this embodiment will be described. When the user operates the input device 16 to set a destination, the navigation device 1 includes information on the vehicle position, information on the set destination, and map update status information on map data stored in the navigation device 1. Is transmitted to the navigation server 4. When the navigation server 4 receives these pieces of information from the navigation device 1, the navigation server 4 searches for a recommended route from the departure point to the destination using the latest map data with the vehicle position as the departure point. Next, the navigation server 4 extracts insufficient information based on the searched recommended route and the received map update status information, and transmits the recommended route and the insufficient information to the navigation device 1. And the navigation apparatus 1 guides the vehicle 100 based on the map data memorize | stored in the navigation apparatus 1, and the recommended path | route and lack information transmitted from the navigation server 4. FIG.

  The navigation device 1 performs guidance of the vehicle 100 based on the recommended route searched by the navigation server 4 with reference to map data stored in the HDD 13. When passing through a location corresponding to the difference portion represented by the shortage information on the recommended route, there is a possibility that appropriate guidance cannot be performed only with the map data stored in the HDD 13, so based on the shortage information Create the simple map mentioned above. For locations that do not correspond to the different portions, the vehicle 100 can be appropriately guided using the map data stored in the HDD 13, so that guidance using a simple map is not performed. In addition, about the method of performing guidance without using a simple map, the method similar to the conventional navigation apparatus may be used.

  7 and 8 show flowcharts executed by the navigation system when performing the above route guidance. FIG. 7 is a flowchart showing the processing executed by the control unit 10 of the navigation device 1 to guide the vehicle 100 and the processing executed by the navigation server 4 side by side. The processing of the navigation device 1 starts when the user sets a destination. The navigation server 4 always executes the process of FIG. FIG. 8 shows the details of the process in which the navigation device 1 guides the vehicle 100 based on the recommended route, the shortage information, and the map data stored in the HDD 13.

  Processing of the navigation device 1 in FIG. 7 will be described. The navigation device 1 starts the process of FIG. 7 when the user sets a destination, and proceeds to step S701. The destination setting method may be, for example, a method of manually inputting to the navigation device 1.

  In step S <b> 701, the control unit 10 of the navigation device 1 transmits map update status information such as map data version information, destination information set by the user, and own vehicle position information via the communication terminal 2. 4 to send. When these pieces of information are transmitted to the navigation server 4, the process waits in step S <b> 702 until the recommended route and the shortage information are returned from the navigation server 4.

  In step S <b> 702, the control unit 10 of the navigation device 1 determines whether the recommended route and the shortage information have been transmitted from the navigation server 4. When the recommended route and the shortage information are transmitted, an affirmative determination is made, and the process proceeds to step S703.

  In step S703, the control unit 10 of the navigation apparatus 1 receives the transmitted recommended route and the shortage information. When the reception is completed, the process proceeds to step S704.

  In step S704, the control unit 10 of the navigation device 1 executes the process shown in FIG. 8 using the recommended route and the shortage information received in step S703 and the map data stored in the navigation device 1 as input information, Guide the vehicle. When the vehicle is guided to the destination, the process returns to the process of FIG. 7 from the process of FIG. 8, and the process of FIG.

  Next, processing of the navigation server 4 in FIG. 7 will be described.

  The navigation server 4 stands by in step S751 until the navigation device 1 transmits map update status information such as version information of map data, destination information, and information on the vehicle position in step S701. When such information is transmitted from the navigation device 1, the navigation server 4 makes a positive determination in step S751, and proceeds to step S752.

  In step S752, the navigation server 4 receives the map update status information, the destination information, and the vehicle position information transmitted from the navigation device 1, and proceeds to step S753.

  In step S753, a recommended route from the vehicle position to the destination is searched based on the vehicle position information and the destination information received in step S752 and the latest map data. When the search for the recommended route is completed, the process proceeds to step S754.

  In step S754, the update status of the map data stored in the navigation device 1 is determined based on the map update status information received in step S752, and the map data and the latest map data stored in the navigation device 1 are determined. The difference is determined by comparing the above. Based on this comparison result, node data corresponding to the difference portion is extracted as deficient information from the latest map data stored in the navigation server 4.

  In step S755, the recommended route searched in step S753 and the shortage information determined in step S754 are transmitted to the navigation device 1 waiting in step S702.

  In step S755, when the recommended route and the shortage information are transmitted to the navigation device 1, the communication with the navigation device 1 is disconnected, and the process returns to step S751, and the destination, the vehicle position, and the map update status information are obtained from the navigation device 1. Wait until it is sent again.

  Next, the process of FIG. 8 executed by the navigation device 1 will be described. The processing in FIG. 8 is processed by the control unit 10 of the navigation device 1 with the recommended route and the shortage information as inputs.

  In step S801, the control unit 10 of the navigation device 1 determines whether or not insufficient information has been received. If insufficient information is received, the process proceeds to step S802. If insufficient information has not been received, the process proceeds to step S803.

  In step S <b> 802, the control unit 10 of the navigation device 1 notifies the user that a route not included in the map data of the car navigation system is included in the route via the speaker 17 or the display monitor 15 using an image or a voice. Do. The content of the notification is not limited to this, and it is only necessary to know that there is a road that is not in the map data of the navigation device 1 in the recommended route because the map data of the navigation device 1 is not the latest, and the shortage information has been received. After the notification ends, the process proceeds to step S803.

  In step S803, it is determined whether or not vehicle 100 is about to pass the place represented by the node data included in the shortage information. For example, it is determined whether or not the vehicle position is within a predetermined distance from the location represented by the node data included in the shortage information. If a positive determination is made, the process proceeds to step S804, and if a negative determination is made, the process proceeds to step S815.

  In step S804, a simple map as shown in FIG. 6 is created based on the shortage information for the location determined to be passing in step S803. When the creation of the simple map is completed, the process proceeds to step S805.

  In step S805, the vehicle 100 is guided using a simple map as shown in FIG. When the vehicle 100 reaches outside the range of the simple map, the process proceeds to step S806.

  In step S806, it is determined whether the vehicle 100 has reached the destination. If the vehicle 100 has reached the destination, the guidance of the vehicle 100 is terminated. If not, the process returns to step S803.

  In step S815, guidance of the vehicle 100 that does not use the simple map is started, continued, or restarted, and the process proceeds to step S806 to determine whether the destination has been reached.

  According to the embodiment described above, the following operational effects are obtained.

(1) In the navigation system of the present embodiment, the navigation server 4 searches for a route from the departure point to the destination based on the latest map data stored in the map database 41 (step S753 in FIG. 7). Then, the recommended route as the search result is transmitted to the navigation device 1 (step S755 in FIG. 7), and is included in the recommended route and the map data stored in the navigation device 1 and stored in the navigation server 4. The information regarding the difference part that is different from the latest map data is extracted as deficient information from the latest map data (step S754 in FIG. 7), and the extracted deficient information is transmitted to the navigation device 1 (FIG. 7). Step S755). The navigation device 1 receives the route transmitted from the navigation server 4 by the process of the control unit 10 (step S703 in FIG. 7), receives the shortage information transmitted from the navigation server 4 (step S703 in FIG. 7), and A simple map is created based on the received shortage information (step S804 in FIG. 8), and when the vehicle 100 passes through a point corresponding to the difference, the vehicle 100 is guided using the simple map (step in FIG. 8). S803, S805), otherwise, the vehicle 100 is guided without using the simple map (step S815 in FIG. 8). Thereby, even if the latest map data is not stored in the navigation device 1 for the road related to the route to the destination, the vehicle 100 can be guided to the destination according to the optimum route.

(2) In the navigation system of the present embodiment, the navigation device 1 transmits map update status information such as the version information of the map data stored in the HDD 13 to the navigation server 4 (step S701 in FIG. 7). The navigation server 4 receives the map update status information transmitted from the navigation device 1 (step 752 in FIG. 7), and extracts nodes to be included in the deficient information based on the comparison result of the map data version information (FIG. 7). Step S754). Thereby, the navigation server 4 can grasp | ascertain correctly the update condition of the map data memorize | stored in the navigation apparatus 1, and can extract insufficient information appropriately.

(3) In the navigation system of the present embodiment, a simple map 600 is created based on the number of connected roads of the node data included in the shortage information and the connected road direction (FIGS. 6A and 6B). 8 step S804). Thereby, it is possible to guide the vehicle based on the latest map data without updating the map data differentially.

(4) In the navigation system of the present embodiment, the entire map 601 displays a straight line between the node point coordinates of two nodes that are included in the shortage information and are shown in the order of passing through the recommended route. (Road 652 in FIG. 6A). The display color of the straight line is made different from that of other roads. Thereby, the user can visually recognize a difference part.

(5) When the shortage information is received in the navigation system according to the present embodiment, the information stored in the navigation device 1 is notified by voice or image (step 802 in FIG. 8). . Thereby, it is possible to prompt the user to update the map data stored in the navigation device 1.

  The above-described embodiment can be modified as follows.

(1) In the present embodiment, the difference between which information is extracted as insufficient information is determined by the navigation server 4 in step S754 in FIG. 7, but may be determined by the navigation device 1. When the navigation device 1 determines the difference portion, the map update status information need not be transmitted / received between the navigation device 1 and the navigation server 4. In this case, after receiving the recommended route in step S <b> 702, the navigation device 1 compares the map data stored in the navigation device 1 with the recommended route, and determines information that is insufficient to guide the vehicle 100. To do. Then, the navigation apparatus 1 should just transmit the signal which requests | requires the navigation server 4 to transmit the shortage information required in order to produce the simple map 600. FIG. And the navigation server 4 should just receive the request | requirement, extract the shortage information corresponding to the difference part which the navigation apparatus 1 discriminate | determined, and should just transmit.

(2) In the present embodiment, the destination used by the navigation server 4 for searching for the recommended route is that the user has set the navigation device 1 to be transmitted to the navigation server 4. You may set the ground. For example, the user may transmit and register the destination setting to the navigation server 4 from the personal computer at home or the portable terminal 2 via the communication network 3.

(3) In this embodiment, only the navigation server 4 searches for a route to the destination, but the navigation device 1 may perform the route search. In this case, only the searched route may be transmitted in step S701. The navigation server 4 may determine the starting point and the destination from the received route, search for the recommended route, compare the recommended route with the route transmitted from the navigation device 1, and determine the difference. .

(4) In this embodiment, node data is transmitted as insufficient information, but may be transmitted including link data.

(5) When the shortage information is received, the navigation device 1 may perform the map data update process in parallel while guiding the vehicle.

(6) The display method of the simple map 600 is not limited to that shown in FIG. For example, the simple map 600 may be a north-up display. Further, the display color of the road corresponding to the different part may be changed.

(7) In FIGS. 1 and 2, the communication terminal 2 is connected to the outside of the navigation device 1, but may be mounted inside the navigation device 1.

(8) When the vehicle 100 deviates from the recommended route, the navigation device 1 may send the vehicle position to the navigation server 4 and request the navigation server 4 to re-search the route. Further, the re-search may be performed by the navigation device 1.

  Each embodiment and various modifications described above are merely examples, and the present invention is not limited to these contents as long as the features of the invention are not impaired.

1: navigation device, 2: communication terminal, 3: communication network, 4: navigation server,
10: control unit, 11: gyro sensor, 12: vehicle speed sensor, 13: HDD,
14: GPS receiver, 15: display monitor, 16: input device, 17: speaker,
100: Vehicle, 600: Simple map

Claims (12)

A server device that stores first map data; and a navigation device that is mounted on the vehicle and guides the vehicle from a departure location to a destination using second map data different from the first map data. A navigation system comprising:
The server device
Route search means for searching for a route from the departure place to the destination based on the first map data;
Route information transmitting means for transmitting information of the route searched by the route searching means to the navigation device;
Insufficient information extraction means for extracting, as insufficient information, information from the first map data regarding a difference portion having a difference in information between the first map data and the second map data in the route;
Shortage information transmitting means for transmitting the shortage information extracted by the shortage information extracting means to the navigation device;
The navigation device
Route information receiving means for receiving information on the route transmitted from the server device;
Shortage information receiving means for receiving the shortage information transmitted from the server device;
Simple map creation means for creating a simple map of the difference portion based on the lack information received by the lack information reception means;
When the vehicle passes a point corresponding to the difference portion of the route, the vehicle is guided using the simplified map, and when the vehicle passes a point not corresponding to the difference portion of the route Comprises a vehicle guidance means for guiding the vehicle based on the route information without using the simple map. The navigation system according to claim 1,
The navigation device
Map update status information transmitting means for transmitting map update status information representing the update status of the second map data to the server device;
The server device
Map update status information receiving means for receiving the map update status information transmitted by the map update status information transmitting means;
A first difference portion determining means for determining the difference portion based on the map update status information received by the map update status information receiving means;
The navigation system according to claim 1, wherein the deficiency information extraction unit extracts deficiency information regarding the difference portion determined by the first difference portion determination unit from the first map data. The navigation system according to claim 1,
The navigation device
Second difference portion determining means for determining the difference portion based on the route information received by the route information receiving means and the second map data;
A deficiency information requesting means for requesting the server device to transmit deficiency information related to the difference part determined by the second difference part determining means;
The server device
Request receiving means for receiving a request by the shortage information requesting means,
The deficiency information extraction unit extracts deficiency information regarding the difference portion determined by the second difference portion determination unit from the first map data based on the request received by the request reception unit. Navigation system. The navigation system according to any one of claims 1 to 3,
The first map data and the second map data include node data representing a plurality of nodes respectively corresponding to a plurality of points on a road map,
The deficient information extracting unit extracts node data representing nodes included in the different portion of the first map data as the deficient information. The navigation system according to claim 4, wherein
The node data includes information on the number of connected roads indicating the number of roads extending from the point represented by the node, and information on a connected road direction indicating the direction in which the road extends from the point. . The navigation system according to claim 5, wherein
The simple map creating means creates a simple map in which the road is drawn in a direction based on the connecting road direction with the point corresponding to the node included in the difference portion as a center. . The navigation system according to claim 6, wherein
The simple map creating means creates a simple map in which a display mode of a road included in only one of the first map data or the second map data is different from a display mode of other roads. A navigation system characterized by The navigation system according to any one of claims 4 to 7,
The node data further includes information on coordinates of a point represented by the node,
The navigation device
Map display means for displaying the road map based on the second map data and displaying the road corresponding to the difference portion on the road map by connecting the coordinates of the node represented by the shortage information with a straight line. A navigation system further comprising: The navigation system according to claim 8,
The said map display means displays the said straight line in the display mode different from the road on the said road map, The navigation system characterized by the above-mentioned. The navigation system according to any one of claims 1 to 9,
A navigation system, further comprising an informing means for informing that the insufficiency information receiving means has received the insufficiency information by image or sound. Communication with the server device storing the first map data is possible. The vehicle is mounted on the vehicle, and the vehicle is guided from the starting point to the destination by using second map data different from the first map data. A navigation device,
Route information receiving means for receiving, from the server device, information on a route from the departure place to the destination;
Shortage information receiving means for receiving shortage information from the server device regarding a difference portion having a difference in information between the first map data and the second map data in the route;
Simple map creation means for creating a simple map of the difference portion based on the lack information received by the lack information reception means;
When the vehicle passes a point corresponding to the difference portion of the route, the vehicle is guided using the simplified map, and when the vehicle passes a point not corresponding to the difference portion of the route Comprises a vehicle guidance means for guiding the vehicle based on the route information without using the simple map. A server device that stores first map data and can communicate with a navigation device mounted on a vehicle,
Route search means for searching for a route from the departure point of the vehicle to the destination based on the first map data;
Route information transmitting means for transmitting information of the route searched by the route searching means to the navigation device;
Information relating to a difference portion having a difference in information between the first map data and the second map data stored in the navigation device is extracted as insufficient information from the first map data. Shortage information extraction means to
A server device comprising: a shortage information transmitting unit that transmits the shortage information extracted by the shortage information extracting unit to the navigation device.

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