JP2012047759A - Traffic information distribution device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a traffic information distribution device for reducing communication costs, and for distributing sufficient traffic information.SOLUTION: This traffic information distribution device comprises: distribution request information reception means for receiving distribution request information for requesting the distribution of traffic information including self-vehicle location information showing the current location of a vehicle and destination information showing destinations from a navigation device loaded on the vehicle; basic distribution range setting means for setting a basic distribution range as the distribution object of the traffic information based on the self-vehicle location information and the destination information included in the distribution request information; distribution range changing means for changing the basic distribution range to set a changed distribution range based on road conditions within the basic distribution range; traffic information extraction means for extracting the traffic information corresponding to the changed distribution range; and traffic information distribution control means for controlling the extracted traffic information so as to be distributed to the navigation device.

Description

  The present invention relates to a traffic information distribution device that distributes traffic information based on a transmission request from a navigation device mounted on a vehicle.

In recent years, various traffic information distribution apparatuses that distribute traffic information based on a transmission request from a navigation apparatus mounted on a vehicle have been proposed.
For example, a transmission request sent from a navigation device mounted on a vehicle is received by communication means, and traffic information corresponding to a road within a predetermined range including the current position of the vehicle is distributed based on the received transmission request. There is a traffic information distribution device that extracts traffic information extracted by a traffic information extraction unit provided in a center and distributes the extracted traffic information to a navigation device by communication means (see, for example, Patent Document 1).

JP 2002-286469 A

  However, in the configuration described in Patent Document 1 described above, no consideration is given to the current position of the vehicle, the road segment in which the vehicle is located, the topography, the time zone, the amount of traffic information, and the like. Is a problem that is delivered. For example, traffic information corresponding to the same range is distributed even during daytime and night when traffic conditions and information amounts vary greatly, and there is a problem that the amount of information increases with unnecessary information and communication costs increase. In addition, when the distribution range is narrowed for the purpose of reducing the amount of information, there is a problem that it is difficult to distribute sufficient traffic information.

  Therefore, the present invention has been made to solve the above-described problems, and it is possible to reduce the communication cost and to distribute sufficient traffic information. An object is to provide an apparatus.

  In order to achieve the above object, a traffic information distribution device according to claim 1 is a traffic information distribution device that distributes traffic information. The vehicle information and destination information that represent the current position of the vehicle from a navigation device mounted on the vehicle. Based on the distribution request information receiving means for receiving distribution request information for requesting distribution of the traffic information including the destination information, and the vehicle position information and the destination information included in the distribution request information. A basic distribution range setting means for setting a basic distribution range that is a distribution target of the traffic information, and a distribution range change that sets the changed distribution range by changing the basic distribution range based on road conditions within the basic distribution range Means, traffic information extracting means for extracting traffic information corresponding to the changed distribution range, and traffic information for controlling the extracted traffic information to be distributed to the navigation device. And distribution control means, characterized by comprising a.

  Further, the traffic information distribution device according to claim 2 is the traffic information distribution device according to claim 1, wherein traffic congestion links for all links within the basic distribution range are based on the traffic information corresponding to the basic distribution range. A traffic jam link calculating means for calculating a ratio is provided, wherein the delivery range changing means sets the changed delivery range based on a traffic jam link ratio with respect to all the links.

  The traffic information distribution device according to claim 3 is the traffic information distribution device according to claim 1, wherein the distribution range changing means determines whether or not there is a distribution range in which no link exists in the basic distribution range. A delivery range judging means for judging, and when the delivery range changing means judges that there is a delivery range in which no link exists in the basic delivery range, so as not to include a delivery range in which this link does not exist The modified distribution range is set.

  According to a fourth aspect of the present invention, there is provided the traffic information distribution device according to the first aspect, wherein the traffic information distribution device according to the first aspect searches for a route based on the own vehicle position information and the destination information included in the distribution request information. A route search means, wherein the basic delivery range setting means sets the basic delivery range forward in the traveling direction from the current position of the vehicle, and the delivery range change means is a link that can travel around the current position of the vehicle When there is a predetermined number or more, the change distribution range is set so as to include the vicinity of the current position of the vehicle.

  The traffic information distribution apparatus according to claim 5 is the traffic information distribution apparatus according to claim 1, wherein the distribution range changing means determines whether or not there is a traffic fault in the basic distribution range. And having a failure determination unit, and when the distribution range changing unit determines that there is a traffic fault within the basic distribution range, the distribution range changing unit sets the changed distribution range so as to expand the basic distribution range. And

  The traffic information distribution device according to claim 6 is the traffic information distribution device according to claim 1, further comprising time detection means for detecting a current time, wherein the distribution range change means is based on the current time. A change distribution range is set.

  Furthermore, the traffic information distribution apparatus according to claim 7 is the traffic information distribution apparatus according to claim 1, wherein the distribution request information further includes a route search condition, and the distribution range changing means includes the search condition. The modified distribution range is set based on the above.

In the traffic information distribution device according to claim 1 having the above-described configuration, traffic information is distributed based on own vehicle position information and destination information included in distribution request information received from a navigation device mounted on a vehicle. Set the basic delivery range. And based on the road condition in a basic delivery range, this basic delivery range is changed and a change delivery range is set. Then, the traffic information corresponding to the set change distribution range is extracted and distributed to the navigation device.
This makes it possible to set a change distribution range that is a traffic information distribution target in consideration of road conditions within the basic distribution range, and reduce communication costs by reducing unnecessary distribution ranges within the basic distribution range. In addition, the basic distribution range can be changed and sufficient traffic information can be distributed.

  Further, in the traffic information distribution apparatus according to claim 2, since the changed distribution range is set based on the ratio of the congestion link to all the links within the basic distribution range, when the congestion link exceeds a predetermined ratio, When the changed delivery range is set by reducing the delivery range, and the traffic congestion link is below a certain percentage, the changed delivery range can be set by expanding the basic delivery range. It is possible to set a change distribution range so as to have an appropriate amount of information to further reduce communication costs and to distribute sufficient traffic information.

In addition, in the traffic information distribution device according to claim 3, when it is determined that there is a distribution range in which no link exists in the basic distribution range, the changed distribution range is set so as not to include the distribution range in which the link does not exist. To do.
This makes it possible to set the changed distribution range so that it does not include distribution ranges that do not have links such as mountainous areas, coasts, lake shores, etc., taking into account the current location and travel route of the vehicle. It becomes possible to reduce communication costs by reducing information, and to distribute sufficient traffic information corresponding to a more effective distribution range.

In the traffic information distribution device according to claim 4, the route search is performed based on the vehicle position information and the destination information included in the distribution request information from the navigation device. Then, the basic distribution range is set forward in the traveling direction from the current position of the vehicle. Further, when there are a predetermined number or more of links that can travel around the current position of the vehicle, the changed distribution range is set by changing the basic distribution range to include the vicinity of the current position of the vehicle. The traffic information corresponding to is distributed to the navigation device.
As a result, a predetermined number or more of links that can travel around the current position of the vehicle are included in the change distribution range, so that traffic information sufficient for route search can be extracted and distributed.

Further, in the traffic information distribution apparatus according to claim 5, when there is a traffic obstacle in the basic distribution range, the changed distribution range is set to expand the basic distribution range, and this changed distribution range is handled. Deliver traffic information to navigation devices.
As a result, when there is a traffic fault in the basic distribution range, traffic information corresponding to a changed distribution range wider than the basic distribution range can be distributed, so sufficient traffic information is distributed to the navigation device. Therefore, the navigation device can search for a route that largely bypasses a traffic obstacle such as an accident or traffic regulation with high accuracy.

  Further, in the traffic information distribution device according to claim 6, since the change distribution range is set based on the current time, the traffic information is considered in consideration of vehicle conditions such as the current position of the vehicle and time factors such as the time zone. It is possible to set the change distribution range that is subject to distribution, and set the change distribution range in each time zone such as the time zone where traffic jams occur frequently so that the amount of traffic information becomes an appropriate information amount Therefore, it is possible to reduce communication costs and to distribute sufficient traffic information.

Furthermore, in the traffic information distribution device according to claim 7, the changed distribution range is set based on the route search condition included in the distribution request information received from the navigation device mounted on the vehicle. Then, the traffic information corresponding to the set change distribution range is extracted and distributed to the navigation device.
Thereby, since the change distribution range is set based on the route search condition, it is possible to set the change distribution range by expanding the basic distribution range in the outward direction in consideration of the spread of the searched route, Sufficient traffic information can be distributed. In addition, when there is little spread of the route depending on the search conditions, it is possible to set the changed delivery range by narrowing the basic delivery range along the route, reducing the amount of traffic information corresponding to the changed delivery range, and reducing the communication cost. It is possible to achieve further reduction of the above.

It is the block diagram which showed the navigation system which concerns on a present Example. It is the block diagram which showed the navigation apparatus of the navigation system. It is a main flowchart which shows the traffic information acquisition process which CPU of a navigation apparatus performs, and the traffic information distribution process which distributes the traffic information which CPU of an information delivery center performs to a navigation apparatus. It is a sub flowchart which shows the sub process of the object road setting process of FIG. It is a subflowchart which shows the subprocess of the delivery range change process of FIG. FIG. 5 is a diagram illustrating an example of each distribution range that is a distribution target of traffic information when a vehicle equipped with a navigation device is located on a so-called highway or a toll road, and when it is not located; (A) shows the case where it is located on a highway or a toll road, (B) is a figure which shows the case where it is not located on a highway or a toll road. It is a figure which shows an example which sets the road division used as the distribution object of traffic information by the distance from the own vehicle position to the destination, or required time, (A) is (B) when distance is long distance or required time is long. ) Is a case where the distance is a medium distance or a medium time where the required time is medium, and (C) is a case where the distance is a short distance or the required time is short. It is a figure which shows an example which changes a basic delivery range and sets a change delivery range so that a delivery range without a link may not be included, (A) is when reducing the width | variety of the left-right direction of a basic delivery range, (B) Is a case where the distribution direction of the basic distribution range is changed, and (C) is a case where the basic distribution range is divided in the left-right direction. It is a figure which shows an example which adds the surroundings of the own vehicle position to a basic delivery range, and sets a change delivery range. It is a figure which shows an example which sets a change delivery range by moving a basic delivery range so that the own vehicle position periphery may be included. It is a figure which shows an example which reduces a basic delivery range and sets a change delivery range, (A) is a case where a basic delivery range is reduced centering on the own vehicle position, (B) is a reference | standard of the own vehicle position and destination direction This is a case where the basic distribution range is reduced to include the reference position. It is a figure which shows an example which expands a basic delivery range and sets a change delivery range, (A) expands a basic delivery range centering on the own vehicle position, (B) is a reference | standard of the own vehicle position and destination direction In this case, the basic distribution range is expanded to include the reference position. It is a figure which shows an example which expands a basic delivery range to an outer side along a basic route, and sets a change delivery range, (A) expands the delivery range ahead from the own vehicle position, (B) shows the own vehicle position. And the basic distribution range including the reference position serving as a reference for the destination direction. It is a figure which shows an example which reduces a basic delivery range inward along a basic route, and sets a change delivery range, (A) is a case where the basic delivery range is reduced inward in the left-right width direction centering on the own vehicle position. B) is a case where the basic distribution range including the vehicle position and the reference position serving as the reference in the destination direction is reduced inward in the left-right width direction. The figure shows an example of setting the changed distribution range by expanding the basic distribution range in the outward direction when there is an accident or traffic restriction such as traffic restrictions within the basic distribution range. When there is a traffic obstacle, (B) is a case where there is a traffic obstacle between the vehicle position and a reference position serving as a reference in the destination direction. It is a figure which shows an example which sets the range of a route search for every layer, and sets the road division used as the delivery object of traffic information for every layer.

  Hereinafter, a traffic information distribution apparatus according to the present invention will be described in detail with reference to the drawings based on an embodiment in which a navigation system is embodied.

  First, a schematic configuration of the navigation system 1 according to the present embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing a navigation system 1 according to the present embodiment.

  As shown in FIG. 1, the navigation system 1 according to this embodiment includes a navigation device 2 and information distribution for distributing traffic information such as update information for updating map information and traffic information described later to the navigation device 2. A center 3 and a network 4 are basically configured. The navigation device 2 and the information distribution center 3 are configured to be able to transmit and receive various types of information via the network 4.

In addition, a road traffic information center (VICS (registered trademark)) 5 is connected to the network 4, and the navigation apparatus 2 and the information distribution center 3 are connected to the traffic control of the police, the Japan Highway Public Corporation, etc. via the network 4. It is configured to be able to receive traffic information such as road traffic congestion information and traffic regulation information created by collecting system information every predetermined time. The traffic information is, for example, detailed information on road traffic information such as road traffic information related to road traffic jams, traffic regulation information due to road construction, construction work, and the like. In the case of road traffic information, the detailed information includes a VICS link ID (to be described later), the actual length of the traffic, the time required to pass through the traffic, the level of traffic (no traffic / congested / separated traffic, etc.), and traffic Vehicle speed, travel time, traveling direction of traffic jam lane, time when traffic jam is expected to be resolved, etc.In the case of traffic regulation information, the duration of VICS link ID, road construction, building construction, etc., which will be described later, no traffic, one-way alternating traffic, The type of traffic regulation such as lane regulation, the time zone of traffic regulation, etc.
The configuration of the navigation device 2 will be described in detail later with reference to FIG.

  As shown in FIG. 1, the information distribution center 3 includes a server 10, a center-side map information database (center-side map information DB) 14 as a map information recording unit connected to the server 10, and a navigation update history information database (navigation). Update history information DB) 15, center side traffic information database (center side traffic information DB) 16, center side communication device 17, and distribution range database (distribution range DB) 18. In addition, the server 10 is based on requests from the navigation device 2 and the arithmetic unit that controls the entire server 10 and the CPU 11 as the control unit, the RAM 12 that is used as a working memory when the CPU 11 performs various arithmetic processes. Of the map information stored in the navigation device 2, the update information for updating the map information of the predetermined area to the new version of the map information is extracted from the center side map information DB 14 and distributed to the navigation device 2. Information update processing, probe information collected by a probe car (for example, month, date, link information (mesh ID, link ID, link length, presence / absence of traffic signal, road type, etc.), traffic condition ( Travel time, traffic congestion, speed, etc.), own vehicle position, secondary mesh I to which own vehicle position belongs , Wiper operation status, outside / road surface temperature, weather, ABS (Antilock brake system) operation information, road surface status, vehicle information (vehicle type, performance specifications, vehicle speed, occupant, vehicle weight distribution ratio, how to apply torque, etc. And current traffic information is created based on the traffic information collected from the road traffic information center (VICS (registered trademark)) 5 and distributed via the network 4 based on a request from the navigation device 2. And an internal storage device such as a ROM 13 in which various control programs for performing traffic information distribution processing (see FIG. 3) and the like, and a timer 19 for measuring time are provided. An MPU or the like can be used instead of the CPU 11.

  In the center-side map information DB 14, update map information 14A, which is map information that is the basis for updating the map information created by the information distribution center 3 and stored in the navigation device 2, is classified for each version. Is remembered. Furthermore, update information for updating part or all of the map information stored in the current navigation device 2 to the update map information 14A is also stored. Here, the version is creation time information for specifying the time when the map information is created, and the time when the map information is created can be specified by referring to the version.

  The update map information 14A stored in the center-side map information DB 14 stores various information necessary for route guidance and map display by the navigation device 2, for example, for displaying a map. Map display data, intersection data regarding each intersection, node data regarding node points, link data regarding roads (road links) as a kind of facility, search data for searching for routes, POIs such as stores as a kind of facility of Interest), store data, search data for searching points, and the like.

  Here, the map display data is divided into 4 divisions (length 1/2), 16 divisions (1/4), and 64 divisions (1/8) based on a secondary mesh partitioned by about 10 km × 10 km. Each unit is set so that the data amount of each unit is approximately the same level. The smallest 64 division size unit is about 1.25 km square.

  Node data includes actual road branch points (including intersections, T-junctions, etc.), node point coordinates (positions) set for each road according to the radius of curvature, etc., nodes A node attribute indicating whether or not is a node corresponding to an intersection, a connection link number list which is a list of link IDs which are identification numbers of links connected to the node, and a list of node numbers of nodes adjacent to the node via the link Are recorded on the adjacent node number list, the height (altitude) of each node point, and the like.

In addition, as link data, for each road link constituting the road (hereinafter referred to as “link”), the width of the road to which the link belongs, the gradient, the cant, the bank, the road surface condition, the number of road lanes, Data representing the number of lanes decreasing, width narrowing, railroad crossings, etc. for corners, curvature radius, intersections, T-junctions, corner entrances and exits, etc. Data representing uphill roads are recorded for road types, including roads such as national roads, prefectural roads, and narrow streets, as well as toll roads such as national highways, urban highways, general toll roads, and toll bridges. The Furthermore, regarding toll roads, data relating to entrance roads (rampways), toll gates (interchanges) and the like of toll roads are recorded.
Hereinafter, a highway national highway, an urban highway, an automobile exclusive road, a general toll road, a one-digit or two-digit national road is referred to as a high-standard road. National roads, major local roads, prefectural roads and municipal roads with more than three digits are called general roads. A street such as a street narrower than a general road is called a narrow street.

  In addition, as search data, data used when searching and displaying a route to a set destination is recorded, and the distance and road width of a link that forms a right / left turn or road when passing through a node. The cost data used to calculate the weight of each node determined by the road type or the like (hereinafter referred to as “cost”), and the route selected by the route search are displayed on the liquid crystal display 25 of the navigation device 2 (see FIG. 2). ) Of the route display data for displaying on the map.

  Further, as store data, data on POIs such as hotels, hospitals, gas stations, parking lots, and tourist facilities in each region are recorded together with IDs that identify the POIs. The center side map information DB 14 also records voice output data for outputting predetermined information by the speaker 26 (see FIG. 2) of the navigation device 2.

  Then, the information distribution center 3 uses the latest version of the update map information 14A stored in the center-side map information DB 14 at the timing when the request is received from the navigation device 2, and the navigation device 2 uses the latest version of the update map information 14A. Update the map information stored in. Specifically, in the navigation system 1 according to the present embodiment, when there is a distribution request for the update map information 14A from the navigation device 2, the update information for updating to the newest update map information 14A. Is delivered to the navigation device 2. Here, as the update information transmitted to the navigation device 2, all information including new road information for identifying the new road of the newest update map information 14A of the latest version may be transmitted. Necessary minimum information for updating from the map information stored in the current navigation device to the newest update map information 14A (only information on the update portion including the new road information for identifying the new road) It may be sent.

  On the other hand, in the navigation update history information DB 15, information related to the update history in which the map information stored in the navigation device 2 has been updated so far is stored together with the navigation identification ID that identifies the navigation device 2. As the update history, which version of map information is used for each link data or node data that specifically constitutes map information is stored, and a new one is updated every time the map information of the navigation device 2 is updated. Rewritten to update history.

  The center-side traffic information DB 16 includes probe information (for example, month, date, link information (mesh ID, link ID, link length, presence / absence of traffic signal, road type, etc.) collected by the probe car. ), Traffic conditions (travel time, congestion level, speed, etc.), own vehicle position, secondary mesh ID to which the own vehicle position belongs, wiper operation status, outside / road surface temperature, weather, ABS (Antilock brake system) From operation information, road surface conditions, vehicle information (vehicle type, performance specifications, vehicle speed, occupant, vehicle weight distribution rate, torque application method, etc.) and road traffic information center (VICS (registered trademark)) 5 The current traffic information 16A, which is information related to traffic jams on the current road, created by collecting the received traffic information, is stored.

The center-side traffic information DB 16 also includes statistics generated based on past traffic information such as VICS signals from the road traffic information center (VICS (registered trademark)) 5 and probe information collected from each probe car. Traffic information 16B is stored.
Note that this statistical traffic information 16B is information on event schedules such as festivals, parades, fireworks displays, scheduled locations, scheduled dates, etc. For example, roads around stations and large commercial facilities are identified every day except weekends. Statistical traffic jam information and traffic jam prediction information may be included such that traffic jams occur at the time of day, or roads around the beaches are jammed during summer holidays.
Further, in the center side traffic information DB 16, every predetermined time in the future (for example, about every 15 minutes from the current time, about every 30 minutes) for each traffic jam created based on the current traffic information 16A and the statistical traffic information 16B. , About every hour, etc.) predicted traffic information 16C, such as traffic jam prediction information.

  Then, the information distribution center 3 receives traffic information between the intersections, statistical traffic information 16B, and traffic jam prediction based on the current traffic information 16A stored in the center-side traffic information DB 16 at the timing requested from the navigation device 2. Information such as predicted traffic information 16C is selected and distributed.

  The traffic information received from the road traffic information center (VICS (registered trademark)) 5 includes a VICS link ID together with information such as road type information, position, distance of a traffic jam section, traffic jam level, and the like. The VICS link ID is an identification number assigned to a VICS link as a travel guide link that is standardized by dividing a road into predetermined intersections. The traffic information also includes information such as the coordinates of the start point and end point in each VICS link, the distance from the start point to the end point, and the like.

  Here, the road (link) and the VICS link stored in the center side map information DB 14 are not the same (generally, the road (link) is subdivided more than the VICS link). . Therefore, each road (link) has a conversion table (contrast table) between the road link ID and the VICS link ID given as an identification number, and the corresponding road link ID is specified based on the VICS link ID. Be able to. Thereby, VICS link ID can be converted into road link ID currently used in the navigation apparatus 2, and traffic information can be transmitted.

  Further, when the current traffic information 16A, the statistical traffic information 16B, and the predicted traffic information 16C are distributed to the distribution range DB 18 based on a request from the navigation device 2 as will be described later, the traffic information 16A, 16B, 16C A basic distribution range 88 (see FIG. 8), a basic distribution range 101 (see FIG. 11), etc., which are basic predetermined ranges (for example, a 50 km square range centered on the own vehicle position) to be transmitted. Stored.

  The information distribution center 3 may be operated by any one of an individual, a company, an organization, a local government, a government-related organization, or the like, and may be operated by a road traffic information center (VICS (registered trademark)) 5. .

  The network 4 includes, for example, a LAN (Local Area Network), a WAN (Wide Area Network), an intranet, a mobile phone line network, a telephone line network, a public communication line network, a dedicated communication line network, a communication line network such as the Internet, etc. Can be used. A communication system using CS broadcasting, BS broadcasting, terrestrial digital television broadcasting, FM multiplex broadcasting, or the like by a broadcasting satellite can also be used. Furthermore, a communication system such as a non-stop automatic fee payment system (ETC) or a narrow area communication system (DSRC) used in an intelligent road traffic system (ITS) can also be used.

  Next, a schematic configuration of the navigation device 2 constituting the navigation system 1 according to the present embodiment will be described with reference to FIG. FIG. 2 is a block diagram showing the navigation device 2 according to the present embodiment.

  As shown in FIG. 2, the navigation device 2 according to the present embodiment is based on a current location detection processing unit 21 that detects the current position of the host vehicle, a data recording unit 22 that records various data, and input information. The navigation control unit 23 that performs various arithmetic processes, the operation unit 24 that receives operations from the operator, the liquid crystal display 25 that displays information such as a map to the operator, and voice guidance related to route guidance are output. And a communication device 27 that communicates with the road traffic information center (VICS (registered trademark)) 5, the information distribution center 3, and the like via a mobile phone network or the like. The navigation control unit 23 is connected to a vehicle speed sensor 28 that detects the traveling speed of the host vehicle.

  The components constituting the navigation device 2 will be described below. The current location detection processing unit 21 includes a GPS 31, a geomagnetic sensor 32, a distance sensor 33, a steering sensor 34, a gyro sensor 35 as an azimuth detection unit, and an altimeter (not shown). And the like, and it is possible to detect the current position, direction, distance to a target (for example, an intersection), and the like.

  Specifically, the GPS 31 detects the current location and current time of the vehicle on the earth by receiving radio waves generated by artificial satellites, and the geomagnetic sensor 32 measures the direction of the vehicle by measuring the geomagnetism. The distance sensor 33 detects a distance between predetermined positions on the road. Here, as the distance sensor 33, for example, the rotational speed of a wheel (not shown) of the vehicle is measured, a sensor that detects the distance based on the measured rotational speed, the acceleration is measured, and the measured acceleration is 2 A sensor that integrates the times and detects the distance can be used.

  The steering sensor 34 detects the rudder angle of the host vehicle. Here, as the steering sensor 34, for example, an optical rotation sensor attached to a rotating portion of a steering wheel (not shown), a rotation resistance sensor, an angle sensor attached to a wheel, or the like is used.

  And the gyro sensor 35 detects the turning angle of the own vehicle. Here, as the gyro sensor 35, for example, a gas rate gyro, a vibration gyro, or the like is used. Further, by integrating the turning angle detected by the gyro sensor 35, the vehicle direction can be detected.

  The data recording unit 22 includes an external storage device and a hard disk (not shown) as a storage medium, a navigation side traffic information database (navigation side traffic information DB) 36, a navigation side map information database (navigation) stored in the hard disk. A side map information DB) 37, a travel history database (travel history DB) 38, a predetermined program, and the like are read out, and a recording head (not shown) that is a driver for writing predetermined data into the hard disk is provided. In this embodiment, a hard disk is used as the external storage device and storage medium of the data recording unit 22, but in addition to the hard disk, a magnetic disk such as a flexible disk can be used as the external storage device. Also, a memory card, magnetic tape, magnetic drum, CD, MD, DVD, optical disk, MO, IC card, optical card, etc. can be used as an external storage device.

Here, in the navigation side traffic information DB 36, the actual length of the traffic jam received from the information distribution center 3 or the road traffic information center (VICS (registered trademark)) 5, the required time, the cause of the traffic jam, and the traffic jam elimination are expected. The current traffic information 36A created from traffic information such as traffic congestion information on the current road traffic congestion, etc. composed of time, etc., and traffic regulation information such as road construction and construction work is stored. The statistical traffic information 36B of the navigation side traffic information DB 36 stores the above-described statistical traffic information 16B distributed from the information distribution center 3 via the communication device 27. The contents of the statistical traffic information 16B stored in the statistical traffic information 36B are updated by downloading the update information distributed from the information distribution center 3 via the communication device 27.
The navigation device 2 stores the statistical traffic information 16B supplied by a CD-ROM or the like in the statistical traffic information 36B, and travel history every predetermined period (for example, every week to 3 months). You may comprise so that it may update based on.
Note that this statistical traffic information 36B includes event schedule information such as scheduled locations, scheduled dates and times for events such as festivals, parades, fireworks displays, etc. For example, roads around stations and large commercial facilities are identified every day except weekends. Statistical traffic jam information and traffic jam prediction information may be included such that traffic jams occur at the time of day, or roads around the beaches are jammed during summer holidays.

Furthermore, the above-mentioned predicted traffic information 16C distributed from the information distribution center 3 via the communication device 27 is stored in the navigation side traffic information DB 36. The contents of the predicted traffic information 16C stored in the predicted traffic information 36C are updated by downloading the update information distributed from the information distribution center 3 via the communication device 27.
Note that the navigation device 2 stores the predicted traffic information 16C supplied by a CD-ROM or the like in the predicted traffic information 36C, and present traffic every predetermined period (for example, every week to three months). You may comprise so that it may update based on information 36A and statistical traffic information 36B.

  The navigation side map information DB 37 stores navigation map information 37 </ b> A that is used for travel guidance and route search of the navigation device 2 and is updated by the information distribution center 3. Here, the navigation map information 37A is composed of various information necessary for route guidance and map display in the same way as the update map information 14A. For example, new road information and a map for identifying each new road are displayed. Map display data for display, intersection data for each intersection, node data for node points, link data for roads (links) as a type of facility, search data for searching for routes, stores as a type of facility, etc. It consists of store data related to POI, search data for searching points, and the like. Since details of each data have already been described, details thereof are omitted here. The contents of the navigation-side map information DB 37 are updated by downloading update information distributed from the information distribution center 3 via the communication device 27.

  Further, in the travel history DB 38, travel history (eg, month, date, link information (mesh ID, link ID, link length, presence / absence of traffic signal, road type, etc.) for each travel of each link. , Traffic conditions (travel time, traffic congestion, speed, etc.), own vehicle position, secondary mesh ID to which the vehicle position belongs, wiper operation status, outside / road surface temperature, weather, ABS (Antilock brake system) operation Information, road surface condition, vehicle information (vehicle type, performance of each specification, vehicle speed, occupant, vehicle weight distribution ratio, how to apply torque, etc.) are sequentially stored.

  As shown in FIG. 2, the navigation control unit 23 constituting the navigation device 2 is a computing device that performs overall control of the navigation device 2, a CPU 41 as a control device, and working when the CPU 41 performs various types of computation processing. The RAM 42 is used as a memory and stores route data when a route is searched, traffic information received from the information distribution center 3, and the control program, as well as the information distribution center 3 as described later. A ROM 43 storing a traffic information acquisition processing program (see FIG. 3) for requesting distribution of traffic information, an internal storage device such as a flash memory 44 storing a program read from the ROM 43, a timer 45 for measuring time, etc. ing. As the RAM 42, ROM 43, flash memory 44, etc., a semiconductor memory, a magnetic core or the like is used. As the arithmetic device and the control device, an MPU or the like can be used instead of the CPU 41.

  In this embodiment, various programs are stored in the ROM 43, and various data are stored in the data recording unit 22. However, the programs, data, and the like are stored in the same external storage device, memory card. It is also possible to read out a program, data, etc. from the flash memory 44 and so on. Further, the program, data, etc. can be updated by exchanging a memory card or the like.

  Furthermore, the navigation control unit 23 is electrically connected to peripheral devices (actuators) of the operation unit 24, the liquid crystal display 25, the speaker 26, and the communication device 27.

  The operation unit 24 is operated when correcting the current location at the start of traveling, inputting a departure point as a guidance start point and a destination as a guidance end point, or when searching for information about facilities, etc. And a plurality of operation switches. Then, the navigation control unit 23 performs control to execute various corresponding operations based on switch signals output by pressing the switches. As the operation unit 24, a keyboard, a mouse, a barcode reader, a remote control device for remote operation, a joystick, a light pen, a stylus pen, or the like can be used. Furthermore, it can also be configured by a touch panel provided on the front surface of the liquid crystal display 25.

  In addition to a route guidance screen on which a map based on the navigation map information 37A is displayed and traffic information on each link is displayed on the liquid crystal display 25, operation guidance, operation menu, key guidance, from the current location to the destination Guide route, guidance information along the guide route, traffic information, news, weather forecast, time, mail, TV program, etc. are displayed. Instead of the liquid crystal display 25, it is also possible to use a CRT display, a plasma display, or the like, or a hologram device that projects a hologram on the windshield of a vehicle.

  In addition, the speaker 26 outputs voice guidance or the like that guides traveling along the guidance route based on an instruction from the navigation control unit 23. Here, examples of the voice guidance to be guided include “200m ahead, turn right at XX intersection”, “Now, the next national road XX is congested”. Note that as the sound output from the speaker 26, in addition to the synthesized sound, various sound effects and various guidance information recorded in advance on a tape, a memory or the like can be output.

  The communication device 27 is a communication means such as a mobile phone network that communicates with the information distribution center 3, and transmits / receives the latest version of updated map information, current traffic information, and the like to / from the information distribution center 3. In addition to the information distribution center 3, the communication device 27 includes congestion information, regulation information, parking information, traffic accident information, and service area congestion transmitted from the road traffic information center (VICS (registered trademark)) 5 or the like. Receive traffic information consisting of information such as the situation.

Next, in the navigation system 1 having the above configuration, a traffic information acquisition process executed by the CPU 41 of the navigation apparatus 2 and a traffic information distribution process for distributing the traffic information executed by the CPU 11 of the information distribution center 3 to the navigation apparatus 2 are illustrated. This will be described with reference to FIGS.
FIG. 3 is a main flowchart showing traffic information acquisition processing executed by the CPU 41 of the navigation device 2 and traffic information distribution processing for distributing the traffic information executed by the CPU 11 of the information distribution center 3 to the navigation device 2. FIG. 4 is a sub-flowchart showing a sub-process of the target road setting process of FIG. FIG. 5 is a sub-flowchart showing a sub-process of the distribution range changing process of FIG.

  First, the “traffic information acquisition process” executed by the CPU 41 of the navigation device 2 will be described with reference to FIG. 3 is stored in the RAM 42 and the ROM 43 provided in the navigation device 2 and executed by the CPU 41.

As shown in FIG. 3, first, in step (hereinafter abbreviated as “S”) 11, the CPU 41 determines whether or not a destination is set by an input operation of the operation unit 24 such as a touch panel or an operation switch. Execute the judgment process. And when the destination is not set (S11: NO), CPU41 complete | finishes the said process.
On the other hand, if it is determined that the destination has been input (S11: YES), the CPU 41 temporarily stores the coordinates of the destination in the RAM 42, and then proceeds to the processing of S12.

Subsequently, in S12, the CPU 41, together with a request command for requesting traffic information from the information distribution center 3, a navigation identification ID, coordinate data of the current position of the own vehicle (hereinafter referred to as "own vehicle position"), The destination coordinate data, route search conditions, version information of the navigation map information 37A, etc. are transmitted.
Thereafter, in S13, the CPU 41 receives the current traffic information 16A including traffic jam information and traffic regulation information from the information distribution center 3, and stores the current traffic information 16A in the current traffic information 36A. The process ends.

  Next, “traffic information distribution processing” executed by the CPU 11 of the information distribution center 3 will be described with reference to FIG. Note that the programs shown in the flowcharts of S111 to S120 in FIG. 3 are stored in the RAM 12 and ROM 13 provided in the information distribution center 3, and are executed by the CPU 11.

  First, in S111, the CPU 11 together with the request command for requesting the traffic information transmitted from the navigation device 2 in S12, the navigation identification ID, the coordinate data of the vehicle position, the coordinate data of the destination, the route search condition, the navigation map Each piece of information such as the version information of the information 37A is received and stored in the RAM 12. Then, the CPU 11 searches the RAM 12 for a basic route to the destination according to the received search conditions based on the update map information 14A corresponding to the version information of the navigation map information 37A stored in the center side map information DB14. Remember.

In S112, the CPU 11 reads out the basic distribution range that is the transmission target of the traffic information 16A, 16B, and 16C from the distribution range DB 18, and stores the basic distribution range in the RAM 12.
For example, when the distance from the vehicle position to the destination is 100 km or more, the 50 km square range centered on the vehicle position, the 30 km forward range from the vehicle position, etc. are read from the distribution range DB 18, and the basic The distribution range is stored in the RAM 12.
Subsequently, in S113, the CPU 11 executes a sub-process of “target road setting process” for setting a road segment to which traffic information is to be distributed.

Here, the sub-process of the “target road setting process” will be described with reference to FIG.
As shown in FIG. 4, in S <b> 211, the CPU 11 determines that the vehicle on which the navigation device 2 is mounted based on the received own vehicle position data is a so-called highway automobile national road, city expressway, automobile exclusive road, general toll road, or the like. It is determined based on the update map information 14A whether the vehicle is located on a highway or a toll road.

And when it determines with the vehicle carrying the navigation apparatus 2 being located on what is called a highway or a toll road (S211: YES), CPU11 transfers to the process of S212. In S212, the CPU 11 sets this highway or toll road and all roads above the narrow streets around the exit of this highway or toll road as road classifications for traffic information distribution and stores them in the RAM 12. To do.
In addition, the CPU 11 replaces the basic distribution range set in S112 with the distribution range to be the distribution target of traffic information on the highway or the toll road on the basic route searched in S111. The vicinity of the exit of the road or toll road is set as the change distribution range and stored in the RAM 12.
Further, the CPU 11 reads the changed distribution range flag from the RAM 12, substitutes “1” for the changed distribution range flag, stores it in the RAM 12 again, and returns to the main flowchart.
At the time of activation, “0” is assigned to the change distribution range flag and stored in the RAM 12.

  On the other hand, if it is determined that the vehicle on which the navigation device 2 is mounted is not located on a so-called highway or toll road (S211: NO), the CPU 11 proceeds to the process of S213. In S213, the CPU 11 sets the road classifications for which the traffic information is to be distributed as all roads above the narrow streets, stores them in the RAM 12, and moves to the processing of S214.

Here, distribution of traffic information when the vehicle on which the navigation device 2 is mounted is located on a so-called highway or toll road (S211: YES) and when it is not located (S211: NO) An example of each distribution range to be processed will be described with reference to FIG.
FIG. 6 shows distribution of traffic information when the vehicle on which the navigation device 2 is mounted is located on a so-called highway or toll road (S211: YES) and when it is not located (S211: NO). It is a figure which shows an example of each delivery range used as object, (A) shows the case where it is located on a highway or a toll road, and (B) is when it is not located on a highway or a toll road FIG.

  As shown in FIG. 6A, when the vehicle position mark 51 representing the vehicle on which the navigation device 2 is mounted is located on the highway 61 (S211: YES), the CPU 11 displays the traffic information. The road segments to be distributed are set to the highway 61 where the vehicle position mark 51 is located and all roads above the narrow streets around the exit 62 on the search route of the highway 61 and stored in the RAM 12. Further, the CPU 11 replaces the basic distribution range set in S112 with the distribution range to be distributed as traffic information on the search route ahead of the vehicle position mark 51 of the highway 61 and the highway 61. The 10 km square centered on the exit 62 on the search route is set as the changed distribution range and stored in the RAM 12.

  Further, as shown in FIG. 6B, when the vehicle position mark 51 representing the vehicle on which the navigation device 2 is mounted is located on a general road 65 such as a national road or a prefectural road other than the expressway or toll road. (S211: NO), the CPU 11 classifies all roads above the narrow streets in the basic distribution range 66 of 30 km square set in front of the search route from the vehicle position mark 51 as road information distribution targets. And stored in the RAM 12.

Subsequently, as shown in FIG. 4, in S214, the CPU 11 travels on the basic route and the distance from the vehicle position to the destination based on the received vehicle position data and the coordinate data of the destination. The required time is calculated and stored in the RAM 12.
In S215, the CPU 11 determines whether the distance from the vehicle position to the destination is a long distance (for example, 100 km or more) or a required time is a long time (for example, 2 hours or more). The determination process to be executed is executed. If the distance from the vehicle position to the destination is a long distance or a long time is required (S215: YES), the CPU 11 proceeds to the process of S216.
In S <b> 216, the CPU 11 sets a road classification subject to traffic information to a high-speed automobile national road, a city expressway, an automobile exclusive road, a general toll road, a high-standard road of a 1-digit or 2-digit national highway, and stores it in the RAM 12. Then, the process returns to the main flowchart.

On the other hand, if the distance from the vehicle position to the destination is not a long distance and the required time is not a long time (S215: NO), the CPU 11 proceeds to the process of S217. In S217, the CPU 11 determines that the distance from the vehicle position to the destination is a medium distance (for example, 30 km or more and less than 100 km) or a medium time (for example, 45 minutes or more and less than 2 hours) with a required time. ) Is executed to determine whether or not.
When the distance from the vehicle position to the destination is a medium distance or a required time is a medium time (S217: YES), the CPU 11 proceeds to the process of S218. In S <b> 218, the CPU 11 sets a road segment to be distributed as traffic information to a prefectural road or higher, stores it in the RAM 12, and returns to the main flowchart.

  On the other hand, if the distance from the vehicle position to the destination is not a medium distance and the required time is not a medium time (S217: NO), the CPU 11 determines that the distance from the vehicle position to the destination is a short distance ( For example, it is less than 30 km.) Or the required time is short (for example, less than 45 minutes), and the process proceeds to S219. In S219, the CPU 11 sets again the road classification for which the traffic information is to be distributed as all roads above the narrow street, stores in the RAM 12, and returns to the main flowchart.

  Here, an example of setting a road segment to be a distribution target of traffic information according to a distance from the vehicle position to the destination or a required time will be described with reference to FIG. FIG. 7 is a diagram showing an example of setting a road segment for which traffic information is to be distributed according to the distance from the vehicle position to the destination or the required time. FIG. 7A shows a case where the distance is long or the required time is long. , (B) is a case where the distance is a medium distance or a middle time where the required time is medium, and (C) is a case where the distance is a short distance or the required time is short.

  As shown in FIG. 7A, the distance from the vehicle position where the vehicle position mark 51 is located to the destination 67 is a long distance (for example, 100 km or more) or a long time (for example, 2 hours). In the case of the above, the CPU 11 sets the national roads 68 and 69 and the city expressway 70 as road classifications to which traffic information is distributed. Further, the CPU 11 sets a basic distribution range 71 of 30 km square from the vehicle position mark 51 forward on the search route.

  In addition, as shown in FIG. 7B, the distance from the vehicle position where the vehicle position mark 51 is located to the destination 73 is a medium distance (for example, 30 km or more and less than 100 km) or the required time is medium. In the case of medium time (for example, 45 minutes or more and less than 2 hours), the CPU 11 sets the national roads 74 and 75, the high-speed automobile national road 76, and the prefectural roads 77 as road classifications to which traffic information is distributed. To do. Further, the CPU 11 sets a basic distribution range 71 of 30 km square from the vehicle position mark 51 forward on the search route.

  Further, as shown in FIG. 7C, the distance from the vehicle position where the vehicle position mark 51 is located to the destination 79 is a short distance (for example, less than 30 km) or the required time is a short time (for example, In the case of less than 45 minutes), the CPU 11 designates all roads such as the national roads 80 and 81, the city highway 82, the prefectural roads 83, the city roads 85, and the town roads 86 as traffic information distribution targets. It is set as a road classification. Further, the CPU 11 sets a basic distribution range 71 of 30 km square from the vehicle position mark 51 forward on the search route.

  Subsequently, as shown in FIG. 3, in S114, the CPU 11 determines whether or not there is a distribution range in which no road exists in the basic distribution range based on the road condition in the basic distribution range set in S112. That is, a determination process for determining whether or not there is a distribution range in which no link exists in the basic distribution range is executed. If there is no distribution range in which no link exists in the basic distribution range (S114: NO), the CPU 11 proceeds to the process of S116.

On the other hand, when there is a distribution range in which no link exists in the basic distribution range (S114: YES), the CPU 11 proceeds to the process of S115. In S <b> 115, the CPU 11 changes the basic distribution range to set a changed distribution range so as not to include a distribution range in which no link exists in the basic distribution range, and stores the changed distribution range in the RAM 12. For example, the CPU 11 changes the distribution direction angle of the basic distribution range, sets the changed distribution range so as not to include the distribution range where no link exists, and stores the changed distribution range in the RAM 12. Further, the CPU 11 reduces the width in the horizontal direction or the width in the front-rear direction of the basic distribution range, sets the changed distribution range so as not to include the distribution range where no link exists, and stores the changed distribution range in the RAM 12. Further, the CPU 11 divides the basic distribution range in the left-right direction, sets the changed distribution range so as not to include the distribution range where no link exists, and stores the changed distribution range in the RAM 12.
Further, the CPU 11 reads out the changed distribution range flag from the RAM 12, assigns “1” to the changed distribution range flag, stores it in the RAM 12 again, and then proceeds to the processing of S116.

Here, an example of changing the basic distribution range and setting the changed distribution range so as not to include the distribution range without the link will be described with reference to FIG. FIG. 8 is a diagram showing an example of setting the changed distribution range so as not to include the distribution range in which the link does not exist by changing the basic distribution range. FIG. 8A illustrates a case where the horizontal width of the basic distribution range is reduced. (B) is a case where the distribution direction of the basic distribution range is changed, and (C) is a case where the basic distribution range is divided in the left-right direction.
As illustrated in FIG. 8A, when the vehicle position is located on a mountain road, the CPU 11 determines a portion overlapping the mountain of the basic distribution range 88 set in front of the vehicle position mark 51. The changed distribution range 89 is set by reducing the width in the left-right direction of the basic distribution range 88 so as not to include, that is, not including a portion where no link exists, and is stored in the RAM 12.

Further, as shown in FIG. 8B, when the vehicle position is located on a coastal road, the CPU 11 detects a portion of the basic distribution range 91 set in front of the vehicle position mark 51 and overlapping the sea. Change the distribution direction of the basic distribution range 91 to a shore side by a predetermined angle so as not to include the part where the link does not exist, and set the changed distribution range 92 so that the distribution target is land. And stored in the RAM 12.
Further, as shown in FIG. 8C, when the own vehicle position is located on the lake shore toward the lake, the CPU 11 overlaps the lake in the basic distribution range 94 set in front of the vehicle position mark 51. This basic distribution range 9 is divided in the left-right direction so as not to include the part, that is, not including the part where the link does not exist, and the respective changed distribution ranges 95 and 96 are set so as to be distributed on land. And stored in the RAM 12.

  Subsequently, as shown in FIG. 3, in S116, the CPU 11 determines the vicinity of the own vehicle position (for example, 2 km to 6 km square centered on the own vehicle position based on the road condition within the basic distribution range set in S112. Whether or not there is a road that can travel to a road within the basic distribution range, that is, the vehicle can travel in the vicinity of the vehicle position (for example, 2 km to 6 km square centered on the vehicle position). A determination process for determining whether or not there are a predetermined number or more of links (for example, 3 to 5 or more) is executed. And when the link which can drive | work around the own vehicle position is less than predetermined number (S116: NO), CPU11 transfers to the process of S118.

On the other hand, when there are a predetermined number or more of links capable of traveling around the vehicle position (S116: YES), the CPU 11 proceeds to the process of S117. In S <b> 117, the CPU 11 changes the basic distribution range so as to include the vicinity of the own vehicle position, sets the changed distribution range, and stores it in the RAM 12.
For example, the CPU 11 sets the changed distribution range by adding the vicinity of the vehicle position to the basic distribution range. Further, the CPU 11 sets the changed distribution range by moving the basic distribution range so as to include the vicinity of the vehicle position.
Further, the CPU 11 reads out the changed distribution range flag from the RAM 12, assigns “1” to the changed distribution range flag, stores it in the RAM 12 again, and then proceeds to the processing of S118.

Here, an example in which the basic distribution range is changed so as to include the vicinity of the vehicle position and the changed distribution range is set will be described with reference to FIGS. 9 and 10. FIG. 9 is a diagram illustrating an example of setting the changed distribution range by adding the vicinity of the vehicle position to the basic distribution range. FIG. 10 is a diagram illustrating an example of setting the changed distribution range by moving the basic distribution range so as to include the vicinity of the vehicle position.
For example, as shown in FIG. 9, the CPU 11 adds a distribution range of about 2 km square to 6 km square centered on the own vehicle position to the basic distribution range 97 set in front of the vehicle position mark 51 to change distribution. A range 98 is set, and the distribution range is expanded to include the vicinity of the vehicle position.
Further, as shown in FIG. 10, the CP 11 moves and changes the basic distribution range 97 set in front of the vehicle position mark 51 to the own vehicle position side by several km (for example, about 2 km to 6 km). A distribution range 99 is set to expand the distribution range around the vehicle position.

Subsequently, as shown in FIG. 3, in S118, the CPU 11 changes the basic distribution range based on the road conditions within the basic distribution range, that is, based on the amount of traffic information corresponding to the road conditions. Then, the sub-process of “distribution range changing process” for setting the changed distribution range is executed.
Here, the sub-process of the “distribution range changing process” will be described with reference to FIG.
As shown in FIG. 5, in S311, the CPU 11 is congested with respect to all the links to be distributed within the basic distribution range based on the current traffic information 16A and the statistical traffic information 16B corresponding to the road conditions within the basic distribution range. Calculate the percentage of links. And CPU11 performs the determination process which determines whether the ratio of a traffic jam link exceeded predetermined ratio (for example, it is 50%).
And when the ratio of a traffic jam link is below a predetermined ratio (for example, 50%) (S311: NO), CPU11 transfers to the process of S313.

On the other hand, when the ratio of the traffic jam link exceeds a predetermined ratio (for example, 50%) (S311: YES), the CPU 11 proceeds to the process of S312.
In S <b> 312, since the traffic amount of traffic information corresponding to the basic distribution range increases, the CPU 11 sets the changed distribution range by reducing the basic distribution range in the inner direction and stores the changed distribution range in the RAM 12. For example, the CPU 11 sets the changed distribution range by reducing the basic distribution range in the inner direction around the own vehicle position, and stores it in the RAM 12. In addition, the basic distribution range is reduced inward so as to include the vehicle position and a reference position serving as a reference for the destination direction, and a changed distribution range is set and stored in the RAM 12.
Further, the CPU 11 reads out the changed distribution range flag from the RAM 12, assigns “1” to the changed distribution range flag, stores the changed distribution range flag in the RAM 12 again, and then proceeds to the processing of S313.

Here, an example in which the basic distribution range is reduced and the changed distribution range is set will be described with reference to FIG. FIG. 11 is a diagram showing an example of setting the changed distribution range by reducing the basic distribution range. FIG. 11A shows the case where the basic distribution range is reduced around the vehicle position, and FIG. This is a case where the basic distribution range is reduced so as to include a reference position serving as a direction reference.
For example, as shown in FIG. 11A, the CPU 11 reduces the 50 km square basic distribution range 101 centered on the vehicle position mark 51 representing the vehicle position to 30 km square centered on the vehicle position mark 51. Then, the changed distribution range 102 is set and stored in the RAM 12.
Further, as shown in FIG. 11B, the CPU 11 sets the basic distribution range 105 including the vehicle position mark 51 representing the own vehicle position and the reference position 104 serving as a reference in the destination direction to the vehicle position mark 51 and the reference position. The changed distribution range 106 is set by reducing the distance inward along the route so as to include the position 104, and stored in the RAM 12.

  Subsequently, as shown in FIG. 5, in S313, the CPU 11 executes a determination process for determining whether or not the traffic congestion link ratio calculated in S311 is equal to or less than a certain ratio (for example, 10% or less). . When the traffic jam link rate exceeds a certain rate (for example, when it exceeds 10%) (S313: NO), the CPU 11 proceeds to the process of S315.

On the other hand, when the ratio of traffic jam links to all links within the basic distribution range is equal to or less than a certain ratio (for example, 10% or less) (S313: YES), the CPU 11 proceeds to the process of S314.
In S <b> 314, the CPU 11 sets the changed distribution range by expanding the basic distribution range in the outward direction and stores it in the RAM 12 because the traffic amount of traffic information corresponding to the basic distribution range has a margin. For example, the CPU 11 sets the changed distribution range by expanding the basic distribution range in the outward direction around the vehicle position, and stores the changed distribution range in the RAM 12. Further, the basic distribution range is expanded outward so as to include the vehicle position and the reference position serving as a reference for the destination direction, and a changed distribution range is set and stored in the RAM 12.
Further, the CPU 11 reads out the changed distribution range flag from the RAM 12, assigns “1” to the changed distribution range flag, stores the changed distribution range flag in the RAM 12 again, and then proceeds to the processing of S313.

Here, an example in which the basic distribution range is expanded and the changed distribution range is set will be described with reference to FIG. FIG. 12 is a diagram showing an example of setting the changed distribution range by expanding the basic distribution range. FIG. 12A shows the case where the basic distribution range is expanded centering on the own vehicle position, and FIG. This is a case where the basic distribution range is expanded so as to include a reference position serving as a direction reference.
For example, as shown in FIG. 12A, the CPU 11 expands the basic distribution range 101 of 50 km square centered on the vehicle position mark 51 representing the vehicle position to 80 km square centered on the vehicle position mark 51. Then, the changed distribution range 108 is set and stored in the RAM 12.
Further, as shown in FIG. 12B, the CPU 11 sets the basic distribution range 105 including the vehicle position mark 51 representing the vehicle position and the reference position 104 serving as the reference in the destination direction to the vehicle position mark 51 and the reference position. A changed distribution range 109 is set by expanding outward along the route so as to include the position 104 and stored in the RAM 12.

Subsequently, as shown in FIG. 5, in S <b> 315, the CPU 11 reads the time data of the timer 19, acquires the current date and time, the current time, specifies the factors such as the current day of the week and the time zone, and stores them in the RAM 12. To do. Then, the CPU 11 executes determination processing for determining whether or not the current time zone is a time zone in which traffic congestion frequently occurs within the basic distribution range set in S112 based on the traffic information 16A, 16B and the like.
When it is determined that the current time zone is not a time zone in which traffic jams frequently occur within the basic distribution range (S315: NO), the CPU 11 proceeds to the process of S317.

On the other hand, when it is determined that the current time zone is a time zone in which traffic jams frequently occur within the basic distribution range (S315: YES), the CPU 11 proceeds to the process of S316. For example, if the current time zone is a morning / evening commuting time zone, the CPU 11 determines that the traffic jam occurs frequently in the basic distribution range, and the process proceeds to S316.
In S316, since the traffic amount of traffic information corresponding to the basic distribution range increases, the CPU 11 proceeds to the process of S317 after executing the process of S312.

Subsequently, in S317, the CPU 11 determines that the current time zone stored in the RAM 12 in S315 is based on the traffic information 16A, 16B, etc., and that the traffic jam hardly occurs within the basic distribution range set in S112. Judgment processing is performed to determine whether or not.
If it is determined that the current time zone is not a time zone in which traffic congestion hardly occurs within the basic distribution range (S317: NO), the CPU 11 proceeds to the process of S319.

On the other hand, when it is determined that the current time zone is a time zone in which traffic congestion hardly occurs within the basic distribution range (S317: YES), the CPU 11 proceeds to the process of S318. For example, if the current time zone is midnight, the CPU 11 determines that the traffic jam hardly occurs within the basic distribution range, and the process proceeds to S318.
In S318, since the traffic amount of traffic information corresponding to the basic distribution range is sufficient, the CPU 11 proceeds to the process of S319 after executing the process of S314.

Subsequently, in S319, the CPU 11 executes a determination process for determining whether or not the received route search condition is a recommendation or toll road priority. And when it determines with the received route search conditions not being recommended or toll road priority (S319: NO), CPU11 transfers to the process of S321.
On the other hand, when it is determined that the received route search condition is recommended or toll road priority (S319: YES), the CPU 11 proceeds to the process of S320.
In S320, the CPU 11 expands the basic distribution range outward along the basic route and expands the changed distribution range because the basic route may expand when the route search condition is recommended or toll road priority. Set and store in RAM 12.
Further, the CPU 11 reads out the changed distribution range flag from the RAM 12, assigns “1” to the changed distribution range flag, stores the changed distribution range flag in the RAM 12 again, and then proceeds to the processing of S321.

  Here, an example in which the basic distribution range is expanded along the basic route and the changed distribution range is set will be described with reference to FIG. FIG. 13 is a diagram showing an example of setting the changed distribution range by expanding the basic distribution range in the outer direction along the basic route. FIG. 13 (A) shows a case where the distribution range ahead of the vehicle position is enlarged. This is a case where the basic distribution range including the vehicle position and the reference position serving as a reference for the destination direction is expanded.

For example, as shown in FIG. 13 (A), the CPU 11 indicates that there is a possibility that the basic route 111 may expand when the route search condition is recommended or priority is toll road. The distribution range ahead of the vehicle position where the vehicle is located is expanded outward, the changed distribution range 113 is set, and stored in the RAM 12.
Further, as shown in FIG. 13B, when the route search condition is recommended or priority is toll road priority, the CPU 11 uses a reference position as a reference in the destination direction from the own vehicle position where the vehicle position mark 51 is located. Since there is a possibility that the basic route 115 to 104 is widened, the basic distribution range 116 including the vehicle position mark 51 and the reference position 104 is expanded outward, a changed distribution range 117 is set, and stored in the RAM 12.

Subsequently, as illustrated in FIG. 5, in S <b> 321, the CPU 11 performs a determination process for determining whether the received route search condition is distance or general road priority. If it is determined that the received route search condition is not distance or general road priority (S321: NO), the CPU 11 proceeds to the process of S323.
On the other hand, when it is determined that the received route search condition is distance or general road priority (S321: YES), the CPU 11 proceeds to the process of S322.
In S322, the CPU 11 reduces the basic distribution range inward along the basic route and changes it because the basic route travels almost straight toward the destination when the route search condition is distance or general road priority. A distribution range is set and stored in the RAM 12.
Further, the CPU 11 reads out the changed distribution range flag from the RAM 12, assigns “1” to the changed distribution range flag, stores it in the RAM 12 again, and then proceeds to the processing of S323.

  Here, an example in which the basic distribution range is reduced inward along the basic route and the changed distribution range is set will be described with reference to FIG. FIG. 14 is a diagram showing an example of setting the changed distribution range by reducing the basic distribution range inward along the basic route. FIG. 14A shows the basic distribution range along the basic route centered on the own vehicle position. In the case of reducing inward, (B) is a case in which the basic distribution range including the vehicle position and the reference position serving as a reference in the destination direction is reduced inward in the left-right width direction.

For example, as shown in FIG. 14A, when the route search condition is distance or general road priority, the CPU 11 moves the basic route 119 from the own vehicle position where the vehicle position mark 51 is located to the destination. Therefore, the basic distribution range 120 is reduced along the basic route 119 in the inner direction, that is, in the left-right width direction, and the changed distribution range 121 is set and stored in the RAM 12.
Further, as shown in FIG. 14B, when the route search condition is distance or general road priority, the CPU 11 determines that the basic route 123 moves from the vehicle position mark 51 representing the vehicle position to the destination direction. Since the vehicle travels substantially straight toward the reference position 104 as a reference, the basic distribution range 124 is reduced inward along the basic route 123, that is, inward in the left-right width direction, and the changed distribution range 125 is set and stored in the RAM 12. .

Subsequently, as shown in FIG. 5, in S323, the CPU 11 performs basic distribution based on the road condition within the basic distribution range set in S112, that is, based on the current traffic information 16A corresponding to this road condition. Judgment to determine whether there is information about traffic obstacles such as accident information and traffic regulation information along the basic route within the range, that is, whether there are traffic obstacles such as accidents and traffic regulations within the basic delivery range Execute the process.
If it is determined that there is no traffic trouble such as an accident or traffic regulation within the basic distribution range (S323: NO), the CPU 11 ends the sub-process, returns to the main flowchart, and proceeds to the process of S119. To do.

On the other hand, when it is determined that there is a traffic obstacle such as an accident or traffic regulation within the basic distribution range (S323: YES), the CPU 11 proceeds to the process of S324.
In S324, the CPU 11 expands and changes the basic distribution range in the outward direction because there is a possibility of detouring and a large route if there is an accident or traffic restriction within the basic distribution range. A distribution range is set and stored in the RAM 12.
Further, the CPU 11 reads out the changed distribution range flag from the RAM 12, assigns “1” to the changed distribution range flag, stores the changed distribution range flag in the RAM 12 again, ends the sub-process, returns to the main flowchart, and performs the process of S119. Migrate to

  Here, an example of setting the changed distribution range by expanding the basic distribution range in the outward direction when there is an accident or a traffic obstacle such as traffic restriction within the basic distribution range will be described with reference to FIG. FIG. 15 is a diagram showing an example of setting the changed distribution range by expanding the basic distribution range in the outward direction when there is a traffic disorder such as an accident or traffic regulation within the basic distribution range. When there is a traffic obstacle ahead from the position, (B) is a case where there is a traffic obstacle between the own vehicle position and a reference position serving as a reference in the destination direction.

For example, as shown in FIG. 15A, the CPU 11 has a traffic regulation due to road construction 128 and a road closure 129 due to an accident ahead of the own vehicle position where the vehicle position mark 51 in the basic distribution range 127 is located. In this case, the basic distribution range 127 is expanded outward (for example, by 30 km in four directions), the changed distribution range 130 is set and stored in the RAM 12.
Further, as shown in FIG. 15B, the CPU 11 performs the road construction 128 between the own vehicle position where the vehicle position mark 51 within the basic distribution range 132 is located and the reference position 104 which is the reference in the destination direction. If there is a traffic restriction due to traffic and a traffic closure 129 due to an accident, the basic distribution range 132 is expanded outward (for example, by 30 km in four directions), and a modified distribution range 133 is set and stored in the RAM 12. To do.

Subsequently, as shown in FIG. 3, in S119, the CPU 11 reads the changed distribution range flag from the RAM 12, and when this changed distribution range flag is “0”, the basic distribution range set in S112 is changed to the traffic information. Current traffic information 16A including traffic congestion information and traffic regulation information corresponding to the road classification set in S113 is extracted and stored in the RAM 12 as distribution traffic information to be distributed to the navigation device 2. .
Further, the CPU 11 reads the changed distribution range flag from the RAM 12, and when this changed distribution range flag is “1”, the changed distribution range set in S115, S117, and S118 is set as the traffic information distribution target, and the above S113. The current traffic information 16A including traffic congestion information and traffic regulation information corresponding to the road classification set in step S1 is extracted and stored in the RAM 12 as distribution traffic information to be distributed to the navigation device 2.
In S120, the CPU 11 distributes the distribution traffic information to the navigation device 2 corresponding to the navigation identification ID received in S111, and then ends the process.

  As described above in detail, in the navigation system 1 according to the present embodiment, the CPU 11 of the information distribution center 3 requests traffic information such as the current traffic information 16A including traffic jam information and traffic regulation information from the navigation device 2. When the vehicle information such as the navigation identification ID, the coordinate data of the vehicle position, the coordinate data of the destination, the route search condition is received together with the request command, the road classification to which the traffic information is distributed is determined from the vehicle position. It sets based on the distance to a destination, or required time (S213-S219). Then, the CPU 11 extracts the current traffic information 16A including traffic jam information and traffic regulation information corresponding to the set road segment and distributes it to the navigation device (S119 to S120).

  Thereby, the CPU 11 determines the road classification (“high-standard road”, “prefectural road or higher”, “all roads”) based on the vehicle information received from the navigation device 2 from the vehicle position to the destination. Because it is set on the basis of the distance to the vehicle or the required time, road segments are appropriately set according to the situation of the vehicle on which the navigation device 2 is mounted, traffic information on unnecessary road segments is reduced, and communication costs are reduced. In addition, it is possible to distribute sufficient current traffic information 16A and the like to the navigation device 2.

Further, when the CPU 11 determines that the vehicle on which the navigation device 2 is mounted is located on a so-called highway or a toll road, the highway or the toll road and the highway or the toll road Set all roads above and below the narrow streets around the exit as road categories to which traffic information such as traffic information 16A including traffic congestion information and traffic regulation information will be distributed, and on this expressway or toll road And the exit periphery of this expressway or toll road is set as a change distribution range (S211: YES to S212).
Thereby, the CPU 11 distributes the current traffic information 16A and the like including traffic jam information and traffic regulation information on the expressway or toll road on which the vehicle is traveling and around the exit of the expressway or toll road to the navigation device 2. (S119 to S120) It is possible to significantly reduce unnecessary traffic information and further reduce the communication cost, and to distribute sufficient current traffic information 16A and the like.

In addition, the CPU 11 reads the time data of the timer 19, acquires the current date and time, identifies the current day of the week, time zone, etc., and the current time zone is frequently jammed within the basic distribution range. If it is determined that it is the time zone to be used, the basic distribution range is reduced in the inner direction to set the changed distribution range (S315: YES to S316). If the CPU 11 determines that the current time zone is a time zone in which traffic congestion hardly occurs within the basic delivery range, the CPU 11 sets the changed delivery range by expanding the basic delivery range outward (S317). : YES to S318).
As a result, the CPU 11 can set a distribution range that is a distribution target of the current traffic information 16A including traffic jam information, traffic regulation information, and the like in consideration of time factors such as a time zone. The distribution range in each time zone such as the time zone to be set is set so that the amount of information such as the current traffic information 16A becomes an appropriate information amount (for example, the information amount such as the current traffic information 16A is set to a constant information amount). It is possible to reduce the communication cost and to distribute sufficient current traffic information 16A and the like.

In addition, when the ratio of the traffic jam links to all the links within the basic delivery range exceeds a predetermined rate (for example, 50%), the CPU 11 displays traffic jam information, traffic regulation information, etc. corresponding to the basic delivery range. Since the traffic of traffic information such as the current traffic information 16A including the traffic increases, the basic distribution range is reduced inward and the changed distribution range is set (S311: YES to S312). Further, the CPU 11 expands the basic distribution range in the outward direction and sets the changed distribution range when the ratio of the congestion link to the total links within the basic distribution range is equal to or less than a certain ratio (for example, 10% or less). Set (S313: YES to S314).
Thereby, the CPU 11 sets the change distribution range so that the information amount of the current traffic information 16A to be distributed to the navigation device 2 becomes an appropriate information amount (for example, the information amount of the current traffic information 16A is The change distribution range is set so that a certain amount of information is obtained.) It is possible to further reduce the communication cost and to distribute sufficient current traffic information 16A and the like.

In addition, when there is a distribution range in which no link exists in the basic distribution range, the CPU 11 changes the basic distribution range so as not to include a distribution range in which no link exists in the basic distribution range. Is set (S114: YES to S115).
This allows the CPU 11 to set the changed distribution range so as not to include a distribution range in which there is no link such as a mountainous area, a coast, or a lake shore in consideration of the current location of the vehicle and the travel route, and unnecessary distribution. It becomes possible to reduce the communication cost by reducing the current traffic information 16A in the range, and to distribute sufficient current traffic information 16A corresponding to a more effective distribution range.

Further, when there is a predetermined number or more of links that can travel around the vehicle position, the CPU 11 changes the basic distribution range so as to include the periphery of the vehicle position and sets the changed distribution range (S116: YES). ~ S117).
Thereby, since the changeable delivery range includes links on which a plurality of routes around the vehicle position can be traveled, the CPU 11 can extract and deliver the current traffic information 16A and the like sufficient for route search.

In addition, when the CPU 11 determines that there is a traffic obstacle such as an accident or traffic regulation within the basic delivery range, if there is a traffic fault such as an accident or traffic regulation within the basic delivery range, the CPU 11 bypasses and turns around. Therefore, the basic distribution range is expanded outward and the changed distribution range is set (S323: YES to S324).
As a result, when there is a traffic obstacle such as an accident or traffic regulation within the basic distribution range, the current traffic information 16A corresponding to a changed distribution range wider than the basic distribution range can be distributed. The current traffic information 16A and the like can be distributed to the navigation device 2, and the navigation device 2 can search for a route that largely bypasses a traffic obstacle such as an accident or traffic regulation with high accuracy.

  Further, when the CPU 11 determines that the received route search condition is recommended or toll road priority, the basic route may be expanded, so the basic distribution range is expanded outward along the basic route. A change distribution range is set (S319: YES to S320). In addition, when the CPU 11 determines that the received route search condition is a distance or general road priority, the basic route travels almost straight toward the destination, so that the basic distribution range extends inward along the basic route. The changed delivery range is set by reducing the size (S321: YES to S322).

  As a result, the CPU 11 sets the changed distribution range based on the route search condition. Therefore, the CPU 11 can set the changed distribution range by expanding the basic distribution range in the outward direction in consideration of the spread of the searched basic route. As a result, sufficient current traffic information 16A and the like can be distributed to the navigation device 2. In addition, when the basic route spread is small due to the route search condition, the CPU 11 can set the changed distribution range by narrowing the basic distribution range inward along the route, and traffic information corresponding to the changed distribution range. It is possible to further reduce the communication cost by reducing the amount.

  In addition, this invention is not limited to the said Example, Of course, various improvement and deformation | transformation are possible within the range which does not deviate from the summary of this invention.

(1) For example, a route search range may be set for each layer, and a road segment for which traffic information is to be distributed may be set for each layer. One example will be described with reference to FIG. FIG. 16 is a diagram illustrating an example in which a route search range is set for each layer, and road segments to be traffic information distribution targets are set for each layer.
As shown in FIG. 16, the CPU 11 includes a periphery of the own vehicle position represented by the vehicle position mark 51 (for example, within 30 km centered on the own vehicle position) and a periphery of the destination 135 (for example, the destination 135). The distribution range 137, 138 of layer 0 to be distributed such as traffic information 16A is set. Further, the CPU 11 sets the respective distribution ranges 139 and 140 of the layer 1 having a predetermined width (for example, a width of about 30 km) to be distributed such as the traffic information 16A and the like outside the respective distribution ranges 137 and 138. . Further, the CPU 11 surrounds the distribution ranges 139 and 140 and sets the distribution range 141 of the layer 2 to be distributed such as the traffic information 16A.

Then, the CPU 11 sets the road segments to be distributed in the respective distribution ranges 137 and 138 as all roads above the narrow street and stores them in the RAM 12. In addition, the CPU 11 sets the road divisions to be distributed in the distribution ranges 139 and 140 to the prefectural roads or more and stores them in the RAM 12. Further, the CPU 11 sets the road classification to be distributed in the distribution range 141 as a high-speed automobile national highway, a city highway, an automobile exclusive road, a general toll road, a single-digit or two-digit high-standard road, and stores it in the RAM 12. To do.
Subsequently, the CPU 11 extracts the current traffic information 16 </ b> A corresponding to each road segment in each of the distribution ranges 137 to 141 and distributes it to the navigation device 2.

  Thereby, since the CPU 11 distributes the current traffic information 16A and the like corresponding to the road segment for each of the layers 0 to 2, the current traffic information 16A and the like corresponding to the route search of the navigation device 2 can be distributed. At the same time, by limiting the road segment to each layer 0 to 2, it is possible to reduce the traffic information amount and reduce the communication cost, and to transmit sufficient current traffic information 16A and the like to the navigation device 2. Can be delivered to.

(2) For example, the CPU 11 becomes a sensor (probe car) as a traveling vehicle, and the current traffic information 16A including traffic jam information based on probe information such as speed (time and position) collected from the probe car. If it is created, the travel history for each probe car is stored, and information such as what kind of road the user of each probe car likes to use and whether to bypass the traffic Is extracted from this travel history, and in step 111 above, a basic route that matches the user of each probe car is searched, and the basic distribution range and road segment to be distributed such as the current traffic information 16A are set. Also good.
As a result, the CPU 11 can extract and distribute the current traffic information 16A specialized for a specific user such as a user of each probe car. Further, the link cost of the user-preferred portion of the statistical traffic information 16B is lowered so that a route suitable for the user of each probe car can be searched, and the route search is performed based on the statistical traffic information 16B. It is also possible to set a basic route, extract current traffic information 16A including traffic jam information, traffic regulation information, etc., and distribute it to each probe car.

  (3) For example, in step 12 described above, the CPU 41 of the navigation device 2 automatically stores information stored in the travel history DB 38 together with a request command for requesting traffic information such as current traffic information 16A including traffic jam information and traffic regulation information. The vehicle travel history data is transmitted to the information distribution center 3. Then, the CPU 11 of the information distribution center 3 determines what road the user of the navigation device 2 likes to use based on the travel history data received together with the request command requesting the traffic information, and the traffic jam. It is possible to extract information such as whether or not it is desired to detour from the data of the travel history, and in step 111, extract the current traffic information 16A specialized for the user of the navigation device 2 and distribute it. In addition, the link cost of the user-preferred portion of the statistical traffic information 16B is lowered so that a route suitable for the user of the navigation device 2 can be searched, and the route search is performed based on the statistical traffic information 16B. Thus, the basic route can be set, and the current traffic information 16A including traffic jam information and traffic regulation information can be distributed to the navigation device 2.

  (4) For example, in the above step (hereinafter abbreviated as S) 11, has the CPU 41 of the navigation device 2 been pressed with a request button for requesting traffic information provided on the operation unit 24 such as a touch panel or an operation switch? You may make it perform the determination process which determines whether or not. And when the request button etc. which request | require traffic information are not pressed down (S11: NO), CPU41 complete | finishes the said process. On the other hand, when a request button for requesting traffic information or the like is pressed (S11: YES), the CPU 41 sends a navigation identification ID together with a request command for requesting traffic information to the information distribution center 3 in S12. The coordinate data of the current position of the own vehicle (hereinafter referred to as “own vehicle position”), the version information of the navigation map information 37A, and the like are transmitted. Thereafter, the CPU 41 may execute the process of S13.

Further, in this case, the CPU 11 of the information distribution center 3 together with the request command for requesting the traffic information transmitted from the navigation device 2 in S111, the navigation identification ID, the coordinate data of the vehicle position, and the navigation map information 37A. Each piece of information such as version information is received and stored in the RAM 12. Then, the CPU 11 executes the process of S112.
Subsequently, in S113, when the CPU 11 determines that the vehicle on which the navigation device 2 is mounted is located on a so-called highway or toll road after performing the process of S211 (S211: YES), the process proceeds to S212. In S <b> 212, the CPU 11 sets this highway or toll road as a road segment to be distributed as traffic information, and stores it in the RAM 12. Further, the CPU 11 sets the distribution range to be the distribution target of traffic information as the changed distribution range on the expressway or the toll road instead of the basic distribution range set in S112 and stores it in the RAM 12. Further, the CPU 11 reads the changed distribution range flag from the RAM 12, substitutes “1” for the changed distribution range flag, stores it in the RAM 12 again, and returns to the main flowchart.

On the other hand, when it is determined that the vehicle on which the navigation device 2 is mounted is not located on a so-called highway or toll road (S211: NO), the CPU 11 performs S214 to S214 after executing the process of S213. The process returns to the main flowchart without executing the process of S219.
And CPU11 performs the process of said S114 thru | or S117. Subsequently, in S118, the CPU 11 returns to the main flowchart without executing the processes of S319 to S324 after executing the processes of S311 to S318. Then, the CPU 11 may end the processing after executing the processing of S119 to S120.

DESCRIPTION OF SYMBOLS 1 Navigation system 2 Navigation apparatus 3 Information distribution center 4 Network 10 Server 11, 41 CPU
12, 42 RAM
13, 43 ROM
16 Center side traffic information DB
16A, 36A Current traffic information 16B, 36B Statistical traffic information 17 Center side communication device 18 Distribution range DB
21 Current location detection processing unit 23 Navigation control unit 27 Communication device 51 Vehicle position mark 66, 71, 88, 91, 94, 97, 101, 105, 112, 116, 120, 124, 127, 132 Basic distribution range 89, 92, 95, 98, 99, 102, 106, 108, 109, 113, 117, 121, 125, 130, 133 Change distribution range

Claims (7)

In a traffic information distribution device that distributes traffic information,
Distribution request information receiving means for receiving distribution request information for requesting distribution of the traffic information including own vehicle position information indicating the current position of the vehicle and destination information indicating a destination from a navigation device mounted on the vehicle; ,
Basic distribution range setting means for setting a basic distribution range to be distributed of the traffic information based on the vehicle position information and the destination information included in the distribution request information;
A delivery range changing means for changing the basic delivery range and setting a changed delivery range based on road conditions within the basic delivery range;
Traffic information extracting means for extracting traffic information corresponding to the changed distribution range;
Traffic information distribution control means for controlling the extracted traffic information to be distributed to the navigation device;
A traffic information distribution device comprising: Based on traffic information corresponding to the basic distribution range, comprising a traffic jam link calculating means for calculating a ratio of traffic jam links to all links in the basic distribution range;
The traffic information distribution apparatus according to claim 1, wherein the distribution range changing unit sets the changed distribution range based on a ratio of traffic jam links to all links. The distribution range changing means has distribution range determination means for determining whether there is a distribution range in which no link exists in the basic distribution range,
When it is determined that there is a distribution range in which no link exists in the basic distribution range, the distribution range change unit sets the changed distribution range so as not to include a distribution range in which the link does not exist. The traffic information distribution apparatus according to claim 1. Route search means for searching for a route based on the vehicle position information and the destination information included in the delivery request information;
The basic distribution range setting means sets the basic distribution range forward in the traveling direction from the current position of the vehicle,
The delivery range changing means sets the changed delivery range so as to include the vicinity of the current position of the vehicle when there are a predetermined number or more of links that can travel around the current position of the vehicle. The traffic information distribution apparatus according to claim 1. The delivery range changing means includes traffic obstacle determination means for judging whether or not a traffic obstacle exists within the basic delivery range,
The distribution range changing means, when it is determined that a traffic fault exists in the basic distribution range, sets the changed distribution range so as to expand the basic distribution range. Traffic information distribution device. It has time detection means for detecting the current time,
The traffic information distribution apparatus according to claim 1, wherein the distribution range changing unit sets the changed distribution range based on the current time. The distribution request information further includes a route search condition,
The traffic information distribution apparatus according to claim 1, wherein the distribution range changing unit sets the changed distribution range based on the search condition.

Images