JP2005337744A - Car navigation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To add the update road information at low communication costs by reducing the amount of information of communications with a navigation server. <P>SOLUTION: A navigation control part 15 of this navigation system acquires route information from a departure location to a destination inputted from an operating part 2 from the navigation server 20, collates and compares the route information with road information corresponding to areas from the departure location to the destination among road map information stored in a first storage means 5, adds information on discrepant parts to the road map information of the storage means in the case of the presence of discrepancy, and displays it on a display part 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a car navigation system capable of changing map information of a car navigation device mounted on an automobile.

In recent years, an increasing number of drivers install a car navigation device in a private car or the like and drive the vehicle to a destination according to the navigation by the car navigation device.
In general, in a car navigation system, navigation information mainly including road map information is stored in a recording medium such as a CD-ROM, DVD-ROM, or HDD, and obtained by a GPS (Global Positioning System) receiver or the like. The road map information is searched and read from the recording medium based on the position information, the current position information is superimposed on the travel route of the read road map information, and the image is displayed on a display unit such as an LCD. Navigation for the user (driver) is performed by displaying a road serving as a travel route to the destination so as to be distinguishable from other roads.

  In such a car navigation device, it is necessary to update the road map information for navigation when a new road is constructed, etc. However, updating all the information increases the cost required for it, so it is set in advance. Based on the timing input or the instruction input by the user, the road map information of the area where the traveling frequency is high or the area based on the past traveling history is taken as unit information from the processing device of the information center and stored in the memory etc. A car navigation system has been proposed in which navigation information of a recording medium is reconstructed using unit information and displayed on a display unit (for example, see Patent Document 1).

In addition, when driving on a new road that does not exist in the road map information, it will be displayed as if driving on a place that is not a road, so drive on a road that does not exist on such road map information. In this case, a technique has been proposed in which a locus of coordinates at the travel position is recorded and the recorded locus is added to map information as being above the road (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 2002-162233 (paragraphs “0011” to “0027”, FIG. 1) JP 2002-048559 A (paragraphs “0025” to “0034”, FIGS. 1 and 2)

However, the conventional techniques described above have the following problems.
That is, in the technology for fetching map information as unit information from a processing device in the information center, there is a problem that the communication cost required for updating the map information is high and the burden on the user or the like is large.
Also, in the technique of recording a trajectory when traveling on a road that is not on the road map information and adding the trajectory to the road map information as road information, a normal travel trajectory acquired from GPS according to the state of radio waves If the road map information cannot be obtained, there is a problem that road information with low accuracy or wrong information enters the road map information.

  An object of the present invention is to solve such a problem.

  Therefore, the car navigation system of the present invention comprises a car navigation device mounted on a car, a navigation server that has the latest road map information and can communicate information with the car navigation device by wireless communication means, The car navigation device includes display means, input means, position acquisition means for acquiring the current position of the vehicle, and storage means for storing road map information, and the car navigation device is a departure place input by the input means. The route information from the destination to the destination is acquired from the navigation server, and the route information and the road map information stored in the storage means are compared with the road information corresponding to the area from the departure point to the destination. If they do not match, the information on the mismatched portion is added to the road map information in the storage means. And displaying on the display means Te.

  In the present invention as described above, the road information that the car navigation device communicates with the navigation server and the navigation server receives the minimum route information searched by the latest road map information and does not exist in the storage means. Therefore, the amount of information for communication with the navigation server can be reduced, and the latest road information can be added at a low communication cost, and navigation using the information can be achieved. .

  Embodiments of a car navigation system according to the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the system configuration of the first embodiment.
As shown in the figure, the system of this embodiment includes a display unit 1 such as an LCD as a display unit, a touch panel arranged on the display unit 1 and an input unit such as operation buttons provided around the display unit 1. A car navigation device including an operation unit 2, a navigation unit 3, a GPS 4 as a position acquisition means for acquiring the current position of the vehicle, and a VICS (Vehicle Information and Communication System) receiver 7; A mobile phone 13 connected to the navigation unit 3 via a modem 11 and a navigation server 20 are included, and the car navigation device is mounted on a car.

  The navigation unit 3 of the car navigation device includes a storage device (hereinafter referred to as a first storage means) 5 having a storage medium such as a DVD-ROM, and a storage device (hereinafter referred to as a hard disk or a flash memory) in which the storage contents can be rewritten. Second storage means) 6, a self-supporting traveling unit 8 having a function of assisting traveling by outputting current position information when the GPS 4 cannot be received normally, and a communication interface 9 as information input / output means The navigation control unit 15 and the information management unit 16 are provided. The communication interface 9 can communicate with the navigation server 20 via the modem 11 and the mobile phone 13.

  In the first storage means 5, road map information used for navigation processing performed by the navigation control unit 15, background image information such as scenery and buildings as the background of the road, characters for guidance, and the like are present along the road Navigation information consisting of symbols and marks representing facilities such as gas stations and service areas are stored in a database, and roads are the coordinates of nodes (intersections) expressed by a combination of latitude and longitude. Stored as a set.

In addition, the road in road map information is comprised by connecting each node with a link (straight line).
The second storage means 6 does not exist in the current position of the car, the travel history storing the current position at regular intervals, the route information to the destination, and the road map information stored in the first storage means 5. Road information (hereinafter, unconfirmed road information) is stored as navigation information.

FIG. 2 is a diagram showing the stored contents of the second storage means 6, in which the route information is stored as r1 and the unconfirmed road information is stored as r2.
Here, the route information r1 and the unconfirmed road information r2 are stored in the same format as the road in the road map information stored in the first storage means 5 for each information, but the route information r1 and the unconfirmed road information r2 Since the nodes are represented by a minimum number of nodes, the intervals are wider than the road nodes in the road map information.

In FIG. 2, the current position of the automobile and the travel history storing the current position at regular intervals are omitted.
The VICS receiver 7 receives traffic information from VICS in each location in real time and outputs it to the navigation control unit 15.
The navigation control unit 15 controls the entire navigation unit based on a control program stored in a ROM (not shown) or the like, and the information output from the information management unit 16 is the information received by the VICS receiver 7 or from the GPS 4 or the independent traveling unit 8. The acquired information such as the current position is superimposed and displayed on the display unit 1, and a communication request to the communication interface 9 is made according to the information input from the operation unit 2 as necessary, and the GPS 4 and the navigation server 20 The function of outputting information received from the information management unit 16 as navigation information is provided.

The information management unit 16 reads the navigation information from the first storage unit 5 and the second storage unit 6 in accordance with the instruction from the navigation control unit 15, combines the navigation information and delivers it to the navigation control unit 15. 15 has a function of performing writing to the second storage means 6 from the information output by 15.
The navigation server 20 is provided with a database storing navigation information based on the latest road map information and the like at the present time, and obtains traffic information from VICS in each place from a communication line and wirelessly communicates from the navigation unit 3 by the mobile phone 13. It has a function of searching for a route based on information from a starting point to a destination sent via a line and transmitting the search result as route information to the mobile phone 13 via a wireless communication line.

In FIG. 1, the first storage means 5 and the second storage means 6 are provided separately. However, if the first storage means 5 is writable, the first storage means 5 and the second storage means 5 are provided. The storage unit 6 does not need to be separated, and can be used as the second storage unit 6 by dividing the storage area of the first storage unit 5.
The operation of the first embodiment having the above-described configuration will be described.

FIG. 3 is a flow chart showing the operation of the first embodiment, which will be described according to the step indicated by S in this figure.
When performing a route search, first, the navigation control unit 15 of the car navigation apparatus displays a screen on the display unit 1 that allows the user to set conditions such as a departure place, a destination, whether or not to use an expressway, and the user follows the screen. When the starting point, destination, conditions and the like are input by the operation unit 2 (S1), the navigation control unit 15 calls the navigation server 20 from the communication interface 9 via the mobile phone 13 to determine whether or not communication is possible. Confirm (S2).

If communication is possible, the latitude and longitude of the departure point and destination are obtained, and information on the obtained latitude and longitude and the above conditions are transmitted from the communication interface 9 to the latest information navigation server 20 through the mobile phone 13. Then, a route search is requested (S3).
The navigation server 20 requested to search for the route collates the route from the departure point to the destination with the road map information stored in a database (not shown) based on the information of the departure point, the latitude and longitude of the destination, and In consideration of conditions and the like, the minimum necessary nodes such as branch points and link information are searched, and this is transmitted to the mobile phone 13 as route information r1.

On the other hand, when the navigation control unit 15 finishes the request, the navigation control unit 15 determines whether or not the mobile phone 13 has received the route information r1 and the like from the navigation server 20 (S4). It is determined whether time has passed (S5).
If the predetermined time has elapsed, the process proceeds to S11. Until the predetermined time elapses, the determinations in S4 and S5 are repeated, and if the mobile phone 13 receives the route information r1 from the navigation server 20 within the predetermined time, the navigation is performed. The control unit 15 delivers the route information r1 to the information management unit 16 and writes it in the second storage means 6 for storage (S6).

  Subsequently, the navigation control unit 15 reads the road map information corresponding to the route from the departure point to the destination in the information management unit 16 and the unconfirmed road information r2 stored in the second storage unit 6, if any. Based on this instruction, the information management unit 16 reads the road map information and the unconfirmed road information r2 from the first storage unit 5 and the second storage unit 6 and delivers them to the navigation control unit 15.

As a result, the navigation control unit 15 compares the node in the route information r1 received from the navigation server 20 with the node of the road in the road map information received from the information management unit 16, and determines whether or not the nodes match ( S7). If they match, the navigation control unit 15 starts navigation.
On the other hand, if the nodes do not match in S7, it is determined whether or not the node that matches the node of the route information r1 of the mismatched portion is stored as the node of the unconfirmed road information r2 (S8). Here, when there is unconfirmed road information r2 composed of the matching nodes, the navigation control unit 15 starts navigation.

  In addition, when there is no unconfirmed road information r2 composed of the matching nodes in S8, the navigation control unit 15 extracts the inconsistent node from the route information r1 (S9), and information as new unconfirmed road information r2 Delivered to the management unit 16. When the information management unit 16 additionally writes the unconfirmed road information r2 in the second storage unit 6 (S10), the navigation control unit 15 starts navigation.

  On the other hand, if the navigation control unit 15 determines in S2 that communication with the navigation server 20 cannot be performed due to busy connections or poor radio wave conditions, or the route information r1 from the navigation server 20 in S5. When it is determined that a certain time has elapsed without receiving the navigation map, the navigation control unit 15 stores the road map information corresponding to the route from the departure point to the destination in the information management unit 16 and the second storage unit 6. If there is unconfirmed road information r2, it is instructed to read it.

  Based on this instruction, the information management unit 16 reads the road map information and the unconfirmed road information r2 from the first storage unit 5 and the second storage unit 6 and delivers them to the navigation control unit 15, and the navigation control unit 15 Referring to the road map information and the unconfirmed road information r2, the route search from the departure point to the destination is performed in consideration of the above conditions (S11), and the minimum node and link information such as a branch point in the route is obtained. The information is transferred to the information management unit 16 as route information r1.

  As a result, when the information management unit 16 additionally stores the route information r1 in the second storage unit 6 (S12), the navigation control unit 15 is stored in the first and second storage units 5 and 6. The navigation is started based on the received information, and when the communication state is restored, the latest information navigation server 20 is requested to search for the route to the current position and the destination, and the processes of S3 to S10 are performed as described above.

  After making a route search request to the navigation server 20, the navigation control unit 15 performs the process of S11 in advance in consideration that the route information r1 is not transmitted within a certain time, and the searched route information r1 is stored. When the information is transferred to the information management unit 16 and the process of S12 is executed, that is, the route information r1 is stored in the second storage unit 6, and the route information r1 is transmitted from the navigation server 20, the second storage unit 6 May be rewritten with the route information r1 received from the navigation server 20.

When navigation is started, the navigation control unit 15 first acquires the current position from the GPS 4 and notifies the information management unit 16 of it.
The information management unit 16 registers the current position in the second storage means 6 as a history, and also stores navigation information such as road map information of the area corresponding to the current position from the first storage means 5 in the second storage means. 6, the route information r <b> 1 is read out, and unconfirmed road information r <b> 2 is stored in the second storage unit 6, and unconfirmed road information r <b> 2 composed of nodes matching the route information r <b> 1 is included in the unconfirmed road information r <b> 2. If there is, or if there is new unconfirmed road information r2 composed of nodes that match the route information r1 in the second storage means 6, the unconfirmed road information r2 composed of coincident nodes or the new unconfirmed road information The road information r2 is read out and delivered to the navigation control unit 15. The navigation control unit 15 superimposes the current position, the navigation information, the route information r1, and the unconfirmed road information r2 or the new unconfirmed road information r2, if any, to identify the road to the destination from other roads. Display on the display unit 1 as possible.

Since the node of the unconfirmed road information r2 or the new unconfirmed road information r2 matches the corresponding node of the route information r1, the unconfirmed road information r2 and the new unconfirmed road information r2 are routed. It is displayed in a state where it overlaps the node of information r1.
When the current position changes as the automobile travels, the display of navigation information or the like is changed according to the changed current position.

  According to the first embodiment described above, the car navigation device communicates with the navigation server 20, receives the minimum route information searched by the navigation server 20 based on the latest road map information, and stores the first memory. Since the unconfirmed road information r2 that did not exist in the means 5 and the second storage means 6 is obtained, the amount of information for communication with the navigation server 20 can be reduced, and the latest road information can be obtained at a low communication cost. Can be added, and navigation based on the information becomes possible.

Next, a second embodiment of the present invention will be described.
Since the unconfirmed road information r2 stored in the second storage means 6 in the first embodiment is the minimum necessary node information, the amount of nodes is insufficient. The trace cannot be performed correctly, and a position difference occurs.
Therefore, even if a road is displayed on the display unit 1 based on the unconfirmed road information r2, it is impossible to calculate a correct distance when the vehicle travels off the road or performs a route search.

  Therefore, in the second embodiment, when the route to the destination includes the route based on the unconfirmed road information r2, the route based on the unconfirmed road information r2 is stored in the route to the other destination, that is, the first storage means 5. The unconfirmed road is displayed on the basis of the travel history when the route is actually traveled on the route based on the unconfirmed road information r2 by displaying it so that the user can identify it by making it lighter or blinking than the road based on the stored road map information. The information r2 is enriched so as to approximate an actual road, and the information is stored in the second storage means 6 as additional road information r4.

FIG. 4 is a diagram showing the stored contents of the second storage means 6 in the second embodiment, in which additional road information r4 is stored in addition to the route information r1 and the unconfirmed road information r2.
FIG. 5 is an explanatory diagram for obtaining additional road information r4.
As shown in this figure, the nodes A, B, and C based on the unconfirmed road information r2 are connected between the general road X and the highway Y of the road map information stored in the first storage means 5, and these are connected. When the user drives the vehicle according to the route information with the link to be displayed as a road, the navigation control unit 15 reaches the end node B from the time when it reaches the start node A of the unconfirmed road information r2. Alternatively, when the current position of the vehicle obtained by GPS 4 is moved away from the road based on the unconfirmed road information r2 before moving away from the end node B, correction is not performed without moving the position of the vehicle onto the road based on the nearby unconfirmed road information r2. The current position of the automobile is acquired at time intervals and stored in the second storage means 6 by the information management unit 16 as a travel history.

The travel history at this time is sequentially monitored by the navigation control unit 15 to check whether the acquisition position by the GPS 4 is correct.
For example, as shown in FIG. 5, when the travel history passes through node C in the middle, it is determined that the acquisition position by GPS 4 is not wrong and a normal travel history is obtained, but the node in which the travel history is in the middle When the vehicle does not pass C, it is determined that the acquisition position by the GPS 4 is incorrect, that is, a normal traveling history is not obtained.

In addition to this, it is determined whether a normal travel history can be obtained depending on whether the travel speed is appropriate for the shape of the road drawn by the travel history.
In this case, if the running speed is appropriate for the shape of the road drawn by the running history, it is judged that a normal running history is obtained. For example, the road based on the running history draws a meandering shape with relatively continuous curves. However, if the travel speed is very fast or if the travel speed is not possible in reality, the acquisition position by GPS4 is incorrect, that is, the normal travel history is not obtained. to decide.

The traveling speed of the automobile can be calculated from, for example, the predicted distance between nodes A, B, and C and the time required to reach node B or node C from node A.
When the end node B is reached in the normal travel history, nodes A, B, and C of the unconfirmed road information r2 are also added with each acquisition position on the travel history as a node, and the information is added to the additional road information (road (Shape information) r4 is stored in the second storage means 6, and the unconfirmed road information r2 that is the object is deleted.

At this time, it is also possible to determine and add the road type of the additional road information r4 from the speed on the travel history and the type of road connected to the start point A and end point B.
For example, when the connecting road of the starting point A is a general road and the connecting destination of the end point B is a highway, the traveling speed exceeds the reference value with a speed obtained by adding a certain value to the speed limit of the general road as a reference value. The information is added as an expressway if the case is less than that, and as a general road.

However, since the travel speed varies depending on the user (driver), the road type may be displayed on the display unit 1 and the user may select and input the road type.
According to the second embodiment described above, the road based on the unconfirmed road information r2 is actually traveled by a car and its travel history is acquired. When the acquired travel history is normal, the node of the travel history is set as the road. Since the additional road information indicating the shape is used, the unconfirmed road information r2 can be enriched so as to approximate an existing road, which is sufficient information for navigation, and corresponds to the actual road.

Next, a third embodiment of the present invention will be described.
In the third embodiment, when driving on a road that does not exist in the navigation information in the first and second storage means 5 and 6, the information on the road is added to the second storage means 6 as new road information r3. It is to be memorized.
While the vehicle is being driven by the user, the travel history is stored in the second storage unit 6 by traveling on a road that does not exist in the navigation information in the first and second storage units 5 and 6 for a certain period of time. In this case, the navigation control unit 15 forms the road shape and travel speed according to the travel history from the place where the road map information etc. starts to travel to the place where the road information starts to travel. From the above, it is confirmed whether the position detection by GPS 4 is correct.

Also in this case, for example, when the road based on the driving history draws a meandering shape with relatively continuous curves, the driving speed is very high or the driving speed is not possible in reality. Is determined that the acquisition position by the GPS 4 is wrong, that is, a normal traveling history is not obtained.
When a normal travel history is obtained, each acquired position on the travel history is used as a node, and the information is stored in the second storage means 6 as new road information r3. Further, the travel history is the same as in the second embodiment. The road type is also determined based on the upper speed and the preceding and following roads, and added to the new road information r3.

Of course, the road type may be displayed on the display unit 1 and the user himself / herself may select and input the road type to be added to the new road information r3.
FIG. 6 is a diagram showing the contents stored in the second storage means 6 in the third embodiment, in which new road information r3 is stored in addition to the route information r1, unconfirmed road information r2, and additional road information r4. Yes.

Since the new road information r3 added to the second storage means 6 in this way is not recognized by the navigation server 20, the road map information of the navigation information in the first and second storage means 5 and 6 etc. Is displayed on the display unit 1 in such a manner that the user can be identified by making the color lighter than other roads or blinking.
When the navigation control unit 15 acquires the new road information r3, it notifies the navigation server 20 of the new road information r3 via the mobile phone from the communication interface 9, and requests confirmation of the existence of the road.

Upon receiving the request, the navigation server 20 searches road map information stored in a database (not shown) to check whether or not a road corresponding to the new road information r3 exists. If there is no route information and road type information, or if there is no such information, a notification to that effect is transmitted to the mobile phone 13.
The content of the information received by the mobile phone 13 is confirmed by the navigation control unit 15, and if it is route information by road nodes and road type information, it is delivered to the information management unit 16.

As a result, the information management unit 16 adds the route information and road information from the navigation server 20 to the new road information r3, stores them in the second storage means 6 as additional road information r4, and stores the new road information r3. delete.
If the information received by the mobile phone 13 is a notification that the requested road does not exist, the new road information r3 is held in the second storage means 6 until the existence of the road is confirmed at a later date. To do.

  On the other hand, when there is no road corresponding to the new road information r3 requested by searching the road map information stored in the database (not shown), the navigation server 20 uses the road map information in the database as the new road information. Store in a road information reception / evacuation area provided outside the stored area, and when a route search request is received from another user, store in this road information reception / evacuation area and refer to the new road information r3 to search for a route I do.

Note that the server administrator (manufacturer, etc.) will later investigate whether or not a road based on the new road information r3 stored in the road information receiving and saving area actually exists, and if it exists, the road map of the latest navigation server 20 is present. In addition to the information, the new road information r3 is deleted from the road information receiving / saving area.
According to the third embodiment described above, in the state where the navigation server 20 cannot be communicated and navigation is performed by the navigation information in the first and second storage means 5 and 6, the first and second When the vehicle travels on a road that does not exist in the navigation information in the storage means 5, 6, the travel history is additionally stored in the second storage means 6 as new road information r3. If there is a newly established road, the road information can be acquired and used for subsequent navigation.

Further, by transmitting the new road information r3 to the navigation server 20 and confirming the presence or absence of the road, navigation can be performed based on the confirmed road information. It becomes information corresponding to the road.
Next, a fourth embodiment of the present invention will be described.
In the fourth embodiment, as described in the first embodiment, when a route search is requested from the car navigation device to the navigation server 20, the navigation control unit 15 of the car navigation device simultaneously performs the route search. .

That is, the navigation control unit 15 requests the navigation server 20 to search for a route, and simultaneously stores the road map information corresponding to the route from the departure point to the destination in the information management unit 16 and the second storage unit 6. If unconfirmed road information r2 is present, an instruction is given to read it.
Based on this instruction, the information management unit 16 reads the road map information, the unconfirmed road information r2, the new road information r3, the additional road information r4, etc. from the first storage unit 5 and the second storage unit 6, and the navigation control unit 15, the navigation control unit 15 refers to the road map information, unconfirmed road information r2, new road information r3, additional road information r4, etc., and takes into account conditions such as whether or not the expressway is used, etc. A route search from the ground to the destination is performed.

  Then, when route information r1 as a search result is sent from the navigation server 20 through the mobile phone 13, the navigation control unit 15 compares the route information r1 with the route information obtained by the search, If they match, the route information r1 from the navigation server 20 is passed to the information management unit 16 and stored in the second storage means 6, and navigation is executed based on the route information r1.

  However, if the two are different and the route distance and the estimated time to reach the destination are also different, the navigation control unit 15 passes the route information r1 from the navigation server 20 to the information management unit 16 and stores it in the second storage means 6. In addition, the communication interface determines whether or not there is a road corresponding to the information of the mismatched portion of the information in the first storage unit 5 or the second storage unit 6 with respect to the route information r1 from the navigation server 20. 9 makes an inquiry to the navigation server 20 through the mobile phone 13.

In response to this inquiry, the navigation server 20 searches and confirms the road map information in a database (not shown) to determine whether or not there is a road corresponding to the mismatched portion information, and when there is no road corresponding to the mismatched portion information. Transmits to the mobile phone 13 the route information of the inquired road and the information that it does not exist.
The navigation control unit 15 causes the information management unit 16 to search whether the information transmitted from the navigation server 20 exists in the unconfirmed road information r2, the additional road information r4, etc. in the second storage means 6, and exists In this case, deletion or only the information of the target portion is deleted, and the route information received as the deleted road information r5 is stored in the second storage means 6 as shown in FIG.

Thereafter, the navigation control unit 15 performs navigation based on the route information r1. At this time, the information management unit 16 applies the second storage unit 6 to the road map information read from the first storage unit 5. The node and link of the road part corresponding to the deleted road information r5 stored in the above are deleted and notified to the navigation control unit 15.
According to the fourth embodiment described above, when a road that existed in the past is abolished, the car navigation device can acquire the information from the navigation server 20 and reflect it in the navigation.

  It should be noted that items such as a route search request, a new road confirmation request, and a road presence confirmation request are provided, and the user can arbitrarily set these items by the operation unit 2 so that the amount of communication to the navigation server 20 can be limited. By doing so, it is possible to reduce the communication cost according to the convenience of the user.

Block diagram showing the system configuration of the first embodiment The figure which shows the memory content of a 2nd memory | storage means Flow chart showing the operation of the first embodiment The figure which shows the memory content of the 2nd memory | storage means in 2nd Example. Illustration for acquiring additional road information The figure which shows the memory content of the 2nd memory | storage means in a 3rd Example. The figure which shows the memory content of the 2nd memory | storage means in a 4th Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display part 2 Operation part 3 Navigation unit 4 GPS
DESCRIPTION OF SYMBOLS 5 1st memory | storage means 6 2nd memory | storage means 7 VICS receiver 8 Autonomous traveling part 9 Communication interface 13 Cellular phone 15 Navigation control part 16 Information management part 20 Navigation server

Claims (9)

A car navigation device mounted on an automobile, and a navigation server that holds the latest road map information and can communicate information with the car navigation device by wireless communication means,
The car navigation device includes display means, input means, position acquisition means for acquiring the current position of the automobile, and storage means for storing road map information.
The car navigation device acquires route information from a departure point to a destination input by the input unit from the navigation server, and the departure point of the route information and road map information stored in the storage unit. Compared with the road information corresponding to the area from the destination to the destination, if they do not match, the information of the mismatched portion is added to the road map information of the first storage means and displayed on the display means Car navigation system. The car navigation system according to claim 1, wherein
A car navigation system characterized in that a road corresponding to the information of the inconsistent portion is displayed so as to be distinguishable from a road based on road information stored in the storage means. The car navigation system according to claim 1, wherein
The travel history obtained from the current position acquired by the position acquisition means at regular time intervals when actually traveling on the road corresponding to the information on the mismatched portion indicates the specific position of the road corresponding to the information on the mismatched portion. A car navigation system characterized in that it is determined whether or not the travel history is normal depending on whether or not the vehicle has passed, and if the travel history is normal, the travel history is stored as information indicating a road shape and displayed during navigation. The car navigation system according to claim 1, wherein
Whether the travel speed is appropriate for the road shape drawn by the travel history obtained from the current position acquired by the position acquisition means at regular time intervals when actually traveling on the road corresponding to the information of the mismatched portion To determine whether or not the travel history is normal, and if the travel history is normal, the travel history is stored as information indicating a road shape and displayed when the navigation is performed. The car navigation system according to claim 1, wherein
The travel history depends on whether the travel speed is appropriate for the road shape drawn by the travel history obtained from the current position acquired by the position acquisition means at regular time intervals when traveling on a road not displayed on the display means. A car navigation system characterized by determining whether or not the vehicle is normal and, if normal, the travel history as new road information. The car navigation system according to claim 5,
A car navigation system characterized in that the new road information is displayed so as to be distinguishable from the road of the road map information. The car navigation system according to claim 5,
Notification of new road information from the car navigation device to the navigation server to check whether a road corresponding to the road map information of the navigation server exists, and if there is, obtain new road information from the navigation server A car navigation system characterized by being displayed during navigation execution. The car navigation system according to claim 7,
The navigation server retains the information on the new road when the road corresponding to the information on the new road notified from the car navigation device does not exist in the road map information, and the route searched when the search request is received A car navigation system characterized by adding new road information to information and transmitting it. A car navigation device mounted on an automobile, and a navigation server that holds the latest road map information and can communicate information with the car navigation device by wireless communication means,
The car navigation device includes display means, input means, position acquisition means for acquiring the current position of the automobile, and storage means for storing road map information.
The car navigation device acquires route information from the departure point to the destination input by the input unit from the navigation server, and refers to road map information stored in the storage unit to determine the route from the departure point to the destination. The route information is searched for, and the searched route information is compared with the route information acquired from the navigation server. If they do not match, the navigation server queries the navigation server for information on the mismatched portion, and the navigation server When it is determined that there is no road corresponding to the information of the part, the car navigation device deletes the information of the inconsistent part from the road map information of the storage means.

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