JP2006308341A - Navigation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To search for an easily-traveling route in which user will not feel fatigue, by searching for a route having superior degree of traffic flow. <P>SOLUTION: This system has a setting part for setting a destination; a storage part for storing search data, including road data, and traffic flowing degree data classified by link showing the traffic flowing degree of each link determined, based on the driving control input of each link; and a route search part for searching for a route to the destination set by the setting part, by using the search data and the traffic flowing degree data classified by link stored in the storage part, and by adding the traffic flowing degree of each link to cost of search of each link. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a navigation system.

Conventionally, in a navigation device mounted on a vehicle such as an automobile, an optimum route from a set departure point to a destination is searched based on road map data and displayed on a display means. . In this case, the route is set so that the distance from the departure point to the destination is the shortest, or the route is set so that the required time is the shortest. In addition, a technique for recording a required time for each link and setting a route so that the total required time is the shortest has been proposed (see, for example, Patent Document 1).
JP-A-6-150189

  However, in the conventional navigation device, factors that impose a burden on the driver who drives the vehicle, such as ease of driving and ease of traveling, are not considered. Therefore, the driver may get tired when traveling along the searched route. For example, even if the route to the destination or the required time is short, if the driver stops driving because the number of stops, such as waiting for traffic lights, or the vehicle speed fluctuates severely, I feel tired and difficult to run, and get tired.

  The present invention solves the above-mentioned conventional problems and searches for a route with good flow rate so that the user can search for a route that is easy to run when traveling and does not feel fatigued by the user. The purpose is to provide.

  For this purpose, in the navigation system of the present invention, a setting unit for setting a destination, search data including road data, and a link indicating the flow rate of each link determined based on the driving operation amount for each link Using the storage unit for storing the separate flow rate data, and the search data and the flow rate data for each link stored in the storage unit, the flow rate of each link is added to the search cost of each link and set by the setting unit A route search unit for searching for a route to the destination.

  According to the present invention, the navigation system searches for a route having a good flow rate. Therefore, it is possible to search for a route that is easy to run when traveling and does not cause the user to feel tired.

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

  FIG. 1 is a diagram showing a configuration of a navigation system according to the first embodiment of the present invention.

  In the figure, reference numeral 10 denotes a navigation system according to the present embodiment, which includes a navigation device 11 operated by an operator as a user, and a data center 27 connected to the navigation device 11 so as to be communicable.

  Here, the navigation device 11 is a vehicle navigation device mounted on a vehicle such as a passenger car, a truck, a bus, or a motorcycle, and includes a calculation means such as a CPU and an MPU, a storage means such as a semiconductor memory, a magnetic disk, and an optical disk, It is a kind of computer provided with a communication interface. The navigation device 11 stores map data including a current position detecting unit that detects a current position by a GPS (Global Positioning System), a geomagnetic sensor, a distance sensor, a beacon sensor, a gyro sensor, road data, search data, and the like. A data unit 12 as a storage unit, a route search process for searching for a route to a set destination based on input information, a route guidance process for a route, and a POI (Point of Interest) for searching for a point or a facility A processing unit 21 that performs various arithmetic processes such as navigation processing such as search processing, an input unit that inputs a destination, a display unit that displays an image, a voice input unit that inputs a destination and the like by voice, and outputs a voice It has an audio output unit and a communication unit, and searches for a route to the set destination. It is adapted to perform guide Te. The operator is, for example, a driver or a passenger of the vehicle, but may be any person.

  The data unit 12 stores map data including search data including road data. That is, the data unit 12 includes a database consisting of various data files, and in addition to search data for searching for a route, a display map of the display unit displays a guide map along the searched route, In order to display other guidance information, various data such as facility data are recorded. The data unit 12 also includes data related to links, which are units constituting a road. Here, the link is a unit constituting a road, and is usually divided with an intersection of three or more roads as a boundary. The intersection includes not only an intersection where a traffic signal lamp is installed but also an intersection where no traffic signal lamp is installed. Therefore, the number of links on a single road is not constant. In addition, the point where the administrative road attribute of a road changes is also handled as a link boundary. And in the normal vehicle navigation apparatus, each link which comprises a road, ie, road link ID as an identification number which identifies a road link, is provided. Further, the data unit 12 also stores various data for outputting predetermined information by the audio output unit. Further, in the data unit 12, vehicle travel history data such as a vehicle travel locus can be accumulated and stored.

  The input unit is for correcting a position at the start of traveling or inputting a destination, and includes an operation key, a push button, a jog dial, and a cross key arranged on the navigation device 11 body. However, it may be a remote controller. When the display unit is a touch panel, it is preferable that the display unit includes operation switches such as operation keys and operation menus displayed on the display screen of the display unit. In this case, input can be performed by touching the operation switch like a normal touch panel, that is, by touching.

  The display screen of the display unit displays operation guidance, operation menus, operation key guidance, a route from the current position to the destination, guidance information along the route, and the like. As the display unit, a CRT, a liquid crystal display, an LED (Light Emitting Diode) display, a plasma display, a holography device that projects a hologram on a windshield, or the like can be used. In addition, a microphone or the like can be used as the voice input unit, and a loud speaker, a headphone, or the like can be used as the voice output unit.

  In the present embodiment, the data unit 12 includes a link-specific flow rate database 13 that stores link-specific flow rate data as data indicating the flow rate of each link. Here, the degree of flow is a concept representing the smoothness of the flow of the vehicle on the road, and is determined by the amount of operation necessary for driving the vehicle, that is, the amount of driving operation. For example, if the flow of vehicles on the road is smooth, the number of times of starting, stopping, accelerating, and decelerating is small, and the amount of driving operation such as accelerator operation and braking operation is small, the flow rate is good. It is supposed to be. On the other hand, if the flow of the vehicle on the road is not smooth, the number of times of starting, stopping, accelerating, decelerating, etc. is large, and the amount of driving operation such as accelerator operation and braking operation is large, the flow rate is poor. It is said. The flow rate is represented by, for example, three stages of good, normal, and poor, but may be more roughly represented by, for example, two stages, or more specifically, for example, a multi-stage of four or more stages. In addition, for example, it may be digitized so as to be expressed by a numerical value of 1-10. The flow rate is associated with each link and is stored in the link-specific flow rate database 13 as link-specific flow rate data. The flow rate for each link stored in the link-specific flow rate database 13 is statistical data based on past data, data acquired from the data center 27, vehicle driving operation acquired by the navigation device 11. It can be updated as appropriate based on data and the like.

  The processing unit 21 includes a data detection processing unit 22, a calculation processing unit 23, and a transmission / reception processing unit 24. The data detection processing unit 22 detects, in addition to the data detected by the current position detection unit, an accelerator opening sensor that detects the opening of the accelerator operated by the driver, and the movement of the brake pedal operated by the driver. Brake sensor, blinker sensor that detects the movement of the blinker switch operated by the driver, shift lever sensor that detects the movement of the shift lever of the transmission operated by the driver, and the steering angle that the driver operates Driving operation data detected by an operation detection sensor that detects a driver's operation such as a steering sensor to be detected is processed. Further, the data detection processing unit 22 also processes data detected by various sensors such as an altimeter, a vehicle traveling speed, that is, a vehicle speed sensor for detecting a vehicle speed. The calculation processing unit 23 performs calculation processing using the data processed by the data detection processing unit 22, and determines the flow rate for each link based on the driving operation amount for each link. Further, the transmission / reception processing unit 24 receives data such as link flow rate data from the data center 27, and transmits data such as vehicle travel history data and link flow rate data to the data center 27. Perform transmission processing.

  The data center 27 includes a server, a communication device, and the like (not shown), and is connected to the navigation device 11 via a network (not shown) so as to communicate with each other. The network may be any communication such as a wired or wireless public communication network, a dedicated communication network, a mobile phone network, the Internet, an intranet, a LAN (Local Area Network), a WAN (Wide Area Network), a satellite communication network, etc. It may be a line network or a combination of these as appropriate. Moreover, it may communicate using CS broadcasting or BS broadcasting by a broadcasting satellite, may communicate using terrestrial digital television broadcasting, may communicate using FM multiplex broadcasting, Road and vehicle communication may be performed using an optical beacon, a radio beacon, an antenna, or the like installed on the side of the road or on the road. The user of the navigation device 11 is preferably a person who is registered in advance in the data center 27 and has a registration ID. The navigation device 11 is also preferably registered.

  The data center 27 includes a database (not shown) that stores data such as link flow rate data, and distributes the data to the navigation device 11. The data stored in the database is based on data collected from traffic control systems such as the police and the Japan Highway Public Corporation, data such as vehicle travel history data and link flow data received from the navigation device 11. Updated as appropriate.

  The data center 27 may include a database that stores map data including search data including road data. In this case, map data can be distributed to the navigation device 11 in response to a distribution request from the navigation device 11. For this reason, the navigation device 11 does not need to store map data in the data unit 12, so that the storage capacity of the storage means can be reduced. Further, the data center 27 may have a function of performing navigation processing such as route search processing and POI search processing. In this case, in response to a route search request and POI search request from the navigation device 11, data related to the searched route, searched POI, and the like can be distributed to the navigation device 11. Therefore, the navigation device 11 does not need to perform navigation processing such as route search processing and POI search processing by the processing unit 21, so that the processing load of the calculation means can be reduced.

  Further, the data center 27 can be omitted. In this case, the navigation device 11 uses the data stored in the link flow rate database 13 such as data collected from traffic control systems such as the police and the Japan Highway Public Corporation, vehicle travel history data, and link flow rate data. Update as appropriate based on the data. For this reason, the navigation device 11 does not need to communicate with the data center 27, so that the time and cost for communication can be reduced.

  In the present embodiment, the navigation system 10 stores a setting unit for setting a destination, search data including road data, and link-specific flow rate data indicating the flow rate of each link from the viewpoint of functions. Using the search data and link flow rate data stored in the storage unit, the flow rate of each link is added to the search cost of each link, and a route to the destination set by the setting unit is searched. A route search unit and a display unit that displays the road and the flow rate corresponding to the road on the map using the map data and the link-specific flow rate data stored in the storage unit.

  Here, the setting unit sets the destination input by the user, similarly to a normal vehicle navigation apparatus. Further, the route search unit searches for a route from the departure point to the destination as in the case of a normal vehicle navigation device. Normally, the current location of the vehicle is automatically input as the departure location, but the operator can input an arbitrary location as the departure location. Then, the route search unit accesses a database stored in the data unit 12 to search for a route so that the distance from the departure point to the destination is the shortest, or to make a route so that the required time is the shortest The path is searched by adding the flow rate of each link to the search cost of each link. Further, a route may be searched with reference to road traffic information such as VICS (R) (Vehicle Information & Communication System) information.

  The display unit displays the road on the map display screen and the flow degree corresponding to the road. The storage unit and the route search unit may belong to either the navigation device 11 or the data center 27.

  Next, the operation of the navigation system 10 having the above configuration will be described. First, the operation | movement which acquires the driving operation data of a vehicle is demonstrated.

  FIG. 2 is a flowchart showing an operation of storing flow rate data for each link according to the first embodiment of this invention.

  First, when the vehicle starts to travel, the navigation device 11 detects the vehicle operation operation data including the steering angle detected by the operation detection sensor, the accelerator opening, the brake pedal movement, the shift lever movement of the transmission, and the like. To get. The driving operation data is acquired in association with the link of the road on which the vehicle has traveled. Moreover, you may make it acquire driving | running | working history data with the said driving operation data. Subsequently, the navigation device 11 performs calculation processing using the acquired driving operation data, and creates flow data by link. In this case, the flow rate for each link is determined based on the driving operation amount for each link.

  Here, a method of calculating the operation load cost for each link and determining the flow rate for each link based on the operation load cost will be described.

  First, the steering operation load cost Cs is calculated. In this case, based on the steering angle of the steering detected by the steering sensor, the number of operations Ops in which the steering operation with the steering angle of 90 degrees or more is performed at each link is counted. Then, the number of operations Ops per unit distance (for example, 100 [m]) in each link is calculated from the counted number of operations Ops, and based on the numerical value of the number of operations Ops per unit distance, it is shown in Table 1 below. The steering operation load cost Cs is determined according to the contents of the table.

なお、舵角が９０度以上のステアリング操作の操作回数Ｏｐｓをカウントする代わりに、舵角の累積値をカウントすることもできる。この場合、各リンクにおいて操作が行われた舵角の値を累積し、累積した値から各リンクにおける単位距離（例えば、１００〔ｍ〕）当たりの舵角θを算出し、単位距離当たりの舵角θの数値に基づき、次の表２に示されるテーブルの内容に従ってステアリングの操作負荷コストＣｓを決定する。

Instead of counting the number of steering operations Ops with a steering angle of 90 degrees or more, a cumulative value of the steering angle can be counted. In this case, the value of the steering angle operated in each link is accumulated, and the steering angle θ per unit distance (for example, 100 [m]) in each link is calculated from the accumulated value, and the steering per unit distance is calculated. Based on the numerical value of the angle θ, the steering operation load cost Cs is determined according to the contents of the table shown in Table 2 below.

続いて、アクセルの操作負荷コストＣａを算出する。この場合、アクセル開度センサが検出したアクセルの開度に基づいて、各リンクにおいてアクセルをオフからオンへ変化させた回数及びオンからオフへ変化させた回数を操作回数Ｏｐａとしてカウントする。そして、カウントされた操作回数Ｏｐａから各リンクにおける単位距離（例えば、１００〔ｍ〕）当たりの操作回数Ｏｐａを算出し、単位距離当たりの操作回数Ｏｐａの数値に基づき、次の表３に示されるテーブルの内容に従ってアクセルの操作負荷コストＣａを決定する。

Subsequently, an accelerator operation load cost Ca is calculated. In this case, based on the accelerator opening detected by the accelerator opening sensor, the number of times the accelerator is changed from OFF to ON and the number of times the accelerator is changed from ON to OFF in each link are counted as the operation number Opa. Then, the number of operations Opa per unit distance (for example, 100 [m]) in each link is calculated from the counted number of operations Opa, and based on the numerical value of the number of operations Opa per unit distance, the following Table 3 shows. The accelerator operation load cost Ca is determined according to the contents of the table.

続いて、ブレーキの操作負荷コストＣｂを算出する。この場合、ブレーキセンサが検出したブレーキペダルの動きに基づいて、各リンクにおいてブレーキペダルをオフからオンへ変化させた回数を操作回数Ｏｐｂとしてカウントする。そして、カウントされた操作回数Ｏｐｂから各リンクにおける単位距離（例えば、１００〔ｍ〕）当たりの操作回数Ｏｐｂを算出し、単位距離当たりの操作回数Ｏｐｂの数値に基づき、次の表４に示されるテーブルの内容に従ってブレーキの操作負荷コストＣｂを決定する。

Subsequently, a brake operation load cost Cb is calculated. In this case, based on the movement of the brake pedal detected by the brake sensor, the number of times the brake pedal is changed from off to on in each link is counted as the number of operations Opb. Then, the number of operations Opb per unit distance (for example, 100 [m]) in each link is calculated from the counted number of operations Opb, and based on the value of the number of operations Opb per unit distance, the following Table 4 shows. The brake operation load cost Cb is determined according to the contents of the table.

そして、ステアリングの操作負荷コストＣｓ、アクセルの操作負荷コストＣａ及びブレーキの操作負荷コストＣｂが決定されると、次の式（１）に従って、総操作負荷コストＣを算出する。
Ｃ＝Ｃｓ＋Ｃａ＋Ｃｂ ・・・式（１）
続いて、総操作負荷コストＣの数値に基づき、次の表５に示されるテーブルの内容に従って各リンク毎の流れ度を決定する。

When the steering operation load cost Cs, the accelerator operation load cost Ca, and the brake operation load cost Cb are determined, the total operation load cost C is calculated according to the following equation (1).
C = Cs + Ca + Cb (1)
Subsequently, based on the value of the total operation load cost C, the flow rate for each link is determined in accordance with the contents of the table shown in Table 5 below.

なお、ここでは、ステアリングの操作負荷コストＣｓ、アクセルの操作負荷コストＣａ及びブレーキの操作負荷コストＣｂを表１〜４に示されるようなテーブルの内容に従って決定する場合について説明したが、操作回数Ｏｐｓ、操作回数Ｏｐａ及び操作回数Ｏｐｂを変数とする関数によって決定するようにしてもよい。また、操作負荷コストを算出する対象の操作として、ステアリング、アクセル及びブレーキの３種類の操作を選択した場合について説明したが、操作負荷コストを算出する対象の操作を２種類以下とすることもできるし、他の種類の操作、例えば、シフトの操作等を加えて、４種類以上とすることもできる。

Here, the case where the steering operation load cost Cs, the accelerator operation load cost Ca, and the brake operation load cost Cb are determined according to the contents of the tables as shown in Tables 1 to 4 has been described. Alternatively, the number of operations Opa and the number of operations Opb may be determined by a function. Moreover, although the case where three types of operations of steering, accelerator, and brake were selected as the target operations for calculating the operation load cost, the target operations for calculating the operation load cost can be two or less types. However, it is also possible to add four or more types by adding other types of operations such as a shift operation.

  Subsequently, the navigation device 11 determines whether or not to store the created flow data by link in the data center 27. And when not storing in the data center 27, the acquired driving operation data are stored in the data part 12, ie, data recording is performed, and a process is complete | finished.

  Further, in the case of storing in the data center 27, the navigation device 11 transmits the created flow rate data by link to the data center 27, that is, performs data transmission, and ends the processing. The link flow rate data transmitted to the data center 27 may be acquired sequentially while the vehicle is traveling, or may be accumulated to some extent in the storage means.

Next, a flowchart will be described.
Step S1: Obtain driving operation data of the vehicle.
Step S2: Flow data by link is created.
Step S3: It is determined whether or not the created flow data by link is stored in the data center 27. If the created flow data for each link is stored in the data center 27, the process proceeds to step S5. If the created flow data for each link is not stored in the data center 27, the process proceeds to step S4.
Step S4: Data recording is performed and the process is terminated.
Step S5: Data transmission is performed and the process is terminated.

  Next, the operation of searching for a route using the flow rate for each link will be described.

  FIG. 3 is a diagram showing a display screen for displaying a route search result in the first embodiment of the present invention. FIG. 4 is a flowchart showing a route search operation in the first embodiment of the present invention.

  First, the user operates the input unit of the navigation device 11 to input and set a desired destination, and performs a route search by inputting to search for a route to the set destination. In route search, for example, a route can be searched for each search condition for searching for a route such as highway priority, general road priority, and the like. Here, a case where a route is searched under the condition of “easy to drive”, that is, a route with a good flow as one of the search conditions will be described.

  In this case, the navigation device 11 determines whether or not the link-specific flow rate data is stored in the data center 27. If the data is not stored in the data center 27, the flow rate data for each link is acquired from the flow rate database for each link 13. In addition, when stored in the data center 27, flow data for each link is acquired from the data center 27.

  Subsequently, the navigation device 11 converts the flow rate for each link into a search cost for each link based on the acquired flow rate data for each link. In this case, the conversion is performed such that the better the flow rate, the lower the search cost. The conversion of the flow rate into the search cost may be performed according to the content of a conversion table set in advance, or may be performed according to a conversion function set in advance. The navigation device 11 adds the converted search cost to the search cost set in advance for each link, and searches for a route based on the total search cost. The route search method based on the search cost is the same as that of a normal vehicle navigation device.

  When the route search ends, the navigation device 11 displays the route search result on the display unit as a route search result display screen 31 as shown in FIG. In FIG. 3, 32 is a current position mark indicating the current position of the vehicle, and 33 is a destination mark indicating the set destination. The route search result display screen 31 displays the A route 34a to the C route 34c as the searched route. Note that the route search result display screen 31 shown in FIG. 3 shows route search results when a plurality of routes are searched according to various search conditions, and three search routes, that is, the A route 34a to 34a. A C route 34c is displayed. In the search condition display fields 35a to 35c, search conditions for the corresponding A route 34a to C route 34c are displayed.

  In the example shown in FIG. 3, the A route 34a is a route searched according to the search condition that prioritizes distance, the B route 34b is a route searched according to the search condition that prioritizes time, and the C route 34c is A route searched according to a search condition that priority is given to a flow. In the case of a search condition in which priority is given to the flow, the navigation device 11 sets a search cost so that a link with a poorer flow rate has a higher search cost, and searches for a route based on the search cost. As a result, a route having a good flow rate and a low search cost is searched for as the C route 34c.

Next, a flowchart will be described.
Step S11: It is determined whether or not the link-specific flow rate data is stored in the data center 27. If the flow data by link is stored in the data center 27, the process proceeds to step S13. If the flow data by link is not stored in the data center 27, the process proceeds to step S12.
Step S12: The flow data by link is obtained from the flow database by link 13.
Step S13: The flow rate data for each link is acquired from the data center 27.
Step S14: The flow rate is converted into a search cost to search for a route, and the process is terminated.

  As described above, in this embodiment, guidance is performed by searching for a route having a good flow rate. Therefore, it is possible to guide a route that is easy to run when traveling and does not cause the user to feel fatigue.

  In a normal vehicle navigation apparatus, there is a case where a route with a poor flow is searched and guided even if the route has a short distance or a short required time. If you drive along a route with poor flow, the number of stops will be high due to signal waiting, etc., the speed of the vehicle will be fluctuating and the flow of the vehicle will not be smooth, the amount of accelerator operation and brake operation will increase, The number of lanes increases and decreases, and the amount of steering operation increases due to lane changes. When the amount of driving operation is large, that is, when the flow rate is inferior, when the user actually travels along the searched route, the user feels difficult to run and feels tired. On the other hand, in this embodiment, the route search is performed by converting the flow rate of each link into a search cost. In this case, since the search cost for each link increases as the flow rate decreases, a route with a good flow rate can be searched.

  Next, a second embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st Embodiment, the description is abbreviate | omitted by providing the same code | symbol. The description of the same operation and the same effect as those of the first embodiment is also omitted.

  FIG. 5 is a diagram showing a display screen for displaying the flow rate according to the second embodiment of the present invention.

  In the present embodiment, the navigation device 11 draws a map and displays a map display screen 51 on the display unit as shown in FIG. In FIG. 5, 52 is a current position mark indicating the current position of the vehicle, and the direction of the arrow in the current position mark 52 indicates the traveling direction of the vehicle. Reference numeral 53 denotes an azimuth mark indicating the azimuth, and both ends of the arrow indicate north-south azimuth. Further, reference numeral 54 denotes a road, and 55a to 55c are first to third flow degree display marks indicating the flow degree in the road section designated on the road 54 displayed on the map display screen 51. The first flow rate display mark 55a indicates that the flow rate is poor, the second flow rate display mark 55b indicates that the flow rate is normal, and the third flow rate display mark 55c indicates that the flow rate is normal. The degree is good. In addition, when the first to third flow rate display marks 55a to 55c are described in an integrated manner, the flow rate display mark 55 will be described.

  In the example shown in FIG. 5, the flow rate display mark 55 is designed so that the flow rate can be intuitively grasped by a pattern, but the shape, pattern, color, etc. of the flow rate display mark 55 The design may be any design as long as the degree of flow can be identified. For example, the flow rate display mark 55 may be displayed in a color such as red or yellow. Further, in the example shown in FIG. 5, the flow rate display mark 55 corresponds to the case where the flow rate is 3 levels, but corresponds to the case where the flow rate is 2 levels or 4 levels or more. May be. In this case, the flow rate display mark 55 is displayed corresponding to the flow rate for each link acquired from the link-specific flow rate database 13 or the data center 27.

  Whether or not to display the flow rate display mark 55 on the map display screen 51 can be set by the user operating the input unit. The flow degree display mark 55 indicates a flow degree in a road section designated in advance, but the road section can be arbitrarily designated, for example, a route from a departure place to a destination. It may be all sections of the road that constitutes, may be a specific link on a specific road, may be all road sections included in a specific area, or may be displayed on the map display screen 51. It may be all road sections included in the displayed range, may be all road sections included within a predetermined radius centered on the current position mark 52, or may be displayed on the map display screen 51. It may be all road sections included within a predetermined radius centered on the displayed cursor, or may be all road sections ahead of the vehicle in the traveling direction. Here, the flow degree display mark 55 is a road section for which the flow degree is set, and indicates the flow degree for all road sections included in the range displayed on the map display screen 51. And

  Thus, in the present embodiment, the flow rate display mark 55 is displayed on the map display screen 51. Therefore, the user can grasp the flow degree of the designated road section, and can select and travel on a road that is easy to run and does not feel fatigue.

  In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

It is a figure which shows the structure of the navigation system in the 1st Embodiment of this invention. It is a flowchart which shows the operation | movement which memorize | stores the flow data classified by link in the 1st Embodiment of this invention. It is a figure which shows the display screen which displays the route search result in the 1st Embodiment of this invention. It is a flowchart which shows the operation | movement of the route search in the 1st Embodiment of this invention. It is a figure which shows the display screen which displays the flow degree in the 2nd Embodiment of this invention.

Explanation of symbols

10 Navigation system 12 Data section 34a A route 34b B route 34c C route 54 Road

Claims (3)

(A) a setting unit for setting a destination;
(B) a storage unit that stores search data including road data, and flow data for each link indicating the flow of each link determined based on the amount of driving operation for each link;
(C) Using the search data and link flow rate data stored in the storage unit, the flow rate of each link is added to the search cost of each link, and the route to the destination set by the setting unit is determined. A navigation system comprising a route search unit for searching. (A) Map data including road data, and a storage unit that stores link-specific flow rate data indicating the flow rate of each link determined based on the driving operation amount for each link;
(B) A navigation system comprising: a display unit that displays roads and flow rates corresponding to roads on a map using map data and link flow rate data stored in the storage unit. The navigation system according to claim 1, wherein the driving operation amount is a steering, accelerator, brake, or shift operation.

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