JP4913692B2 - Route search device, navigation device, route search method, and route search program - Google Patents

Description

  The present invention relates to a route search device for searching for a route to a destination.

  A conventional navigation apparatus has a function of receiving a GPS signal from a GPS satellite, calculating the current location of the vehicle, searching for a route from the current location to the destination, and guiding the vehicle to the destination according to the route. . In addition to such a function, in recent years, there are devices that are connected to a mobile phone as a wireless communication device and have a wireless communication function for controlling a call of the mobile phone. Such a navigation device equipped with a wireless communication function eliminates the need for direct operation of the mobile phone using the driver's hand, and enables so-called hands-free calling that allows the user to talk without holding the mobile phone. It is said. According to such a navigation device, the driver can talk without disturbing the driving operation of the vehicle.

In the above-described navigation device, for example, when searching for a route from the current location to the destination, a place where communication by a wireless communication device such as a tunnel cannot be performed is avoided and the area where communication is possible is preferentially traveled. There is a technique for searching for a route (see Patent Document 1).
JP 2000-227339 A

  However, according to the navigation device described in Patent Document 1, even when the wireless communication device is not used during traveling, the route is searched so as to travel preferentially in an area where communication is possible. It took more time than necessary to search for a detour route and reach the destination.

  The problem to be solved by the present invention includes the above-described problem as an example.

In order to solve the above-mentioned problem, the invention according to claim 1 is scheduled to arrive after a predetermined time has elapsed from a local point when a communication device capable of communication with the outside communicates with the outside. In accordance with a route searched using a specific search criterion for a section from the scheduled arrival point after a predetermined time and a route searched using a normal search criterion for the section from the planned arrival point after the predetermined time to the destination Guidance means for guiding.

In order to solve the above problem, the invention according to claim 8 arrives after a predetermined time elapses from a local point when a communication device capable of external communication with the outside communicates with the outside. A route searched using a specific search criterion for a section to a planned arrival point after a predetermined time, and a route searched using a normal search criterion for a section from the planned arrival point after the predetermined time to the destination Guide according to.

In order to solve the above-mentioned problem, the invention according to claim 9 arrives after a lapse of a predetermined time from a local point when a communication device capable of external communication with the outside communicates with the outside. A route searched using a specific search criterion for a section to a planned arrival point after a predetermined time, and a route searched using a normal search criterion for a section from the planned arrival point after the predetermined time to the destination The computer executes a navigation method that guides the user according to the above.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 is a block diagram illustrating a hardware configuration example of the navigation device 100 according to the first embodiment. In addition, although the route search apparatus and navigation apparatus in this invention are demonstrated using the structure of the navigation apparatus 100, it is not limited to this. Moreover, although the said navigation apparatus demonstrates as what was equipped in the vehicle as a moving body, for example, it is applicable also as what was hold | gripped by the pedestrian as a moving body.

    In the navigation device 100, the storage device 18, the arithmetic device 20, the display control circuit 14, and the interface 6 are connected to the bus 12.

  A display 15 is connected to the navigation device 100. Various sensors 22, a speaker 18, a touch panel 21, and a call device 23 are connected to the navigation device 100 via an interface 6. The display 15 and various sensors 22 may be part of the navigation device 100.

  A storage device 18, an interface 6, an arithmetic device 20 and a display control circuit 14 are connected to the bus 12. Therefore, the arithmetic unit 20 is configured to be able to exchange data with the storage device 18, the interface 6, and the display control circuit 14.

  The call device 23 is a phone device for making a call with the outside of the vehicle. The communication device 23 is connected to the navigation device 100 so that, for example, the driver directly operates the communication device 23 by hand, and the driver does not need to hold the communication device 23 by hand. This is a telephone device that is controlled so as to be able to make a call with the outside of the telephone, that is, a so-called hands-free call. The telephone device 23 is connected to the interface 6.

  The telephone device 23 has a function of performing data communication with a predetermined base station (not shown). In the present embodiment, the call device 23 performs data communication of a voice of a user such as a driver who has picked up sound by a microphone (not shown), and data received by the call device 23 is transmitted via the interface 6 and the bus 12. It sends to the arithmetic unit 20 mentioned later. Then, the arithmetic unit 20 outputs the transmitted data as sound from a speaker 18 or the like which will be described later.

  Examples of the various sensors 22 include any one or a combination of the acceleration sensor 5, the gyro sensor 2, the vehicle speed pulse detector 3, the GPS (Global Positioning System) 4, the geomagnetic sensor 11, and the like. In the present embodiment, when the outputs of the various sensors 22 are collectively referred to, they are also called “sensor data”.

  The acceleration sensor 5 has a function of detecting, for example, at least one of a vehicle acceleration and an inclination angle. The gyro sensor 2 has a function of detecting the moving direction of the vehicle, for example. The gyro sensor 2 is a kind of angular velocity sensor that outputs angular velocity data accompanying a change in the direction of the vehicle. The gyro sensor 2 may measure the tilt angle instead of the acceleration sensor 5.

  The vehicle speed pulse detector 3 has a function of detecting the amount of movement and acceleration of the vehicle, for example. The vehicle speed pulse detector 3 detects whether the vehicle is moving or stopped, and outputs the detected state. The vehicle speed pulse detector 3 has a function of outputting travel state data relating to the travel speed and travel distance of the vehicle when the vehicle is moving. The GPS 4 has a function of receiving and calculating radio waves from a plurality of GPS satellites and performing positioning. For example, the GPS 4 generates positioning data of any one of latitude, longitude, altitude, and traveling direction, or any combination thereof.

  Specifically, the GPS 4 has a function of, for example, measuring pseudo distances to four satellites observed at the same time and positioning the current location based on a difference in pseudo distances to these four satellites. The geomagnetic sensor 11 is a kind of azimuth detecting device that detects an angle representing the absolute azimuth of a vehicle based on geomagnetism. Examples of such an angle include an azimuth angle.

  The storage device 18 includes a ROM 8, a RAM 9, and a recording medium 16. The ROM 8 is an information storage medium in which various processing programs described later and other necessary information are written in advance. The RAM 9 is an information storage medium on which information necessary for executing the various programs is written and read.

  The RAM 9 is a memory capable of storing programs, tables, and data described later in a volatile manner. The recording medium 16 is an information storage medium such as a flash memory or a hard disk. The storage medium 16 can store map data described later in a nonvolatile manner. This map data includes information about nodes and links, for example.

  The arithmetic unit 20 includes a CPU 7 and a graphic controller 13. The CPU 7 has a function of performing various calculations and controls according to the various programs. The graphic controller 13 has a function of acquiring image data from a video RAM (not shown) or the like under the control of the CPU 7 and causing the display control circuit 14 to display an image based on the image data on the display 15.

  Specifically, the graphic controller 13 displays, for example, an electronic map based on the map data on the display 15 under the control of the CPU 7, or a mark indicating the position (current location) of the vehicle on the electronic map. It has a function to display it by superimposing and mapping. The CPU 7 controls a hands-free call in the call device 23. That is, when the call device 23 receives an incoming signal from the outside, a signal indicating that the incoming signal has been received is acquired via the interface 6. Then, for example, the CPU 7 receives a command from the touch panel 21 indicating that a user such as a driver has operated the “call” button, thereby controlling the call device 23 to make a call possible, and using the received data as voice. Output from a speaker (not shown). For the response to the voice from the other party, the CPU 7 converts the voice of a user such as a driver collected by a microphone (not shown), for example, and sends it to the call device 23 via the interface 6. Then, the CPU 7 controls the communication device 23 to transmit the data.

  In addition, when the CPU 7 acquires a signal indicating that the call device 23 makes a call from the touch panel 21, the CPU 7 controls the call device 23 to make a call possible. For example, the CPU 7 sets the telephone number of the other party input by the touch panel 21. Based on this, a transmission signal is transmitted. When there is a response from the other party to the outgoing call, the CPU 7 outputs the received data as voice from a speaker 18 or the like described later as voice. In this way, the CPU 7 controls the call device 23 to enable a hands-free call.

  The speaker 18 has a function of outputting sound under the control of the CPU 7. The touch panel 21 is a transparent switch provided, for example, along the surface of the display area of the display 15. The touch panel 21 is configured such that, for example, when there is a contact by a driver or a passenger in accordance with a display object in the display area of the display 15, a switch at the contact location is turned on. Then, as described above, it is possible to input a call to the call device 23, a call origination command, a call destination telephone number, and the like.

  FIG. 2 is a block diagram illustrating a configuration example of software or the like that operates in the navigation device 100 illustrated in FIG. Note that the software shown in FIG. 2 is an example of a program and data whose operation is controlled by the CPU 7. Hereinafter, a configuration example of software will be described with reference to FIG.

  The navigation device 100 includes a route search unit 31, a call control unit 32, a search reference setting unit 33, a guide unit 34, and a cost table 35. In this configuration example, a configuration other than the guidance unit 34 described later corresponds to a configuration example of the route search device of the present invention. First, a configuration example of this route search apparatus will be described.

  The route search unit 31 corresponds to route search means. The route search unit 31 has a function of searching for a route to the destination using the set search criteria. In the present embodiment, this function is referred to as a “route search function” and costs are exemplified as search criteria. Note that this route search is performed by calculation using cost. As will be described later, the cost numerically represents the ease of traveling for each road link, and the route search calculates the route that minimizes the total cost of the road link to the destination as the recommended route. . That is, a road link with a numerically high cost is unlikely to be adopted as a route, and conversely, a road link with a numerically low cost is likely to be adopted as a route.

  The call control unit 32 corresponds to control means. The call control unit 32 has a function of controlling the call of the call device 23. The call device 23 is an example of a communication device. In this embodiment, this function is called a “call control function”.

  In the present embodiment, the call control unit 32 manages whether or not the call device 23 is controlled using a call flag. Specifically, for example, the call control unit 32 indicates that the call flag is in a state where an incoming or outgoing call is made and a user such as a driver is making a call using the call device 23. Is set to “ON”. On the other hand, the call control unit 32 sets the call flag to “OFF” when, for example, a call is not received or transmitted, and a user such as a driver is not calling using the call device 23. " Note that the presence / absence of a call in the present invention is an example in which a call is present when the call flag is “ON” and no call is present when the flag is “OFF”. Incidentally, when a user such as a driver shifts to a call using the call device 23 after the dial tone or the ring tone is stopped, the communication flag remains “ON”. Alternatively, if the user such as the driver does not shift to the call using the call device 23 after the ringing tone is stopped, the communication flag is changed from “ON” to “OFF”.

  The search reference setting unit 33 corresponds to search reference setting means. The search reference setting unit 33 sets a cost used when the route search unit 31 performs a calculation for searching for a route depending on whether or not the call control by the call control unit 32 is controlled. Specifically, when the call control unit 32 does not control the call of the call device 23, the search reference setting unit 33 sets the cost used by the route search unit 31 to a normal cost. On the other hand, when the call control unit 32 controls the call of the call device 23, the search reference setting unit 33 sets the cost used for the route search by the route search unit 31 to a specific cost. As described above, the search reference setting unit 33 sets either a normal cost or a specific cost depending on whether or not the call control by the call control unit 32 is controlled.

  That is, when the call flag is “OFF”, the search reference setting unit 33 sets the cost used by the route search unit 31 for the route search as a normal cost. On the other hand, when the call flag is “ON”, the search reference setting unit 33 sets the cost used by the route search unit 31 for the route search to a specific cost. When the call flag is changed from “ON” to “OFF”, the search reference setting unit 33 changes the cost used for the route search by the route search unit 31 from the normal cost to the specific cost, and the call flag When “OFF” is changed to “ON”, the specific cost may be changed to the normal cost, and the route search using the changed cost may be performed by the route search unit 31.

  Here, in the present embodiment, the “specific cost” represents a cost used for searching for a route to which the vehicle should be guided, for example, when a call is made by the call device 23. A specific example of the “specific cost” is a cost for searching for a route that is relatively easy for the driver to travel while talking. This cost is the cost for each road link determined by the coefficient or element cost, and the cost required by differentiating the coefficient or element cost from the coefficient or element cost for determining the normal cost is specified. Cost. This easy-to-run route is, for example, a route that allows the driver to perform a driving operation without being distracted as much as possible while talking to the other party. In addition to this specific cost, for example, even if the driver travels while talking, there is also a cost for searching for a route that can continue the call state satisfactorily as much as possible. Various other standards can be adopted.

  In the present embodiment, a state in which the route search unit 31 searches for a route using a normal cost is referred to as “normal mode”, while a state in which the route search unit 31 searches for a route using a specific cost is referred to as “call”. Called “hour mode”.

  The cost table 35 corresponds to cost management means. The cost table 35 manages a coefficient set according to, for example, a road attribute and a cost for each road link set using the coefficient. Here, the road attributes represent expressways, ordinary roads, tunnels, outside the calling area in the communication device 23, bridges, and the like. Such a coefficient is used to determine the cost of the road link according to the attribute of the road. These coefficients and costs are called “normal costs” in the normal mode and “costs in the call” in the call mode.

  When the call control unit 32 controls the call of the call device 23, the search reference setting unit 33 sets the cost in the cost table 35 used for route search by the route search unit 31 as the call cost. Specifically, the search reference setting unit 33 sets a call cost as a cost from the cost table 35 when the call flag is ON. On the other hand, the search reference setting unit 33 sets a normal cost as a cost from the cost table 35 when the call flag is OFF.

  3 and 4 are diagrams showing a first configuration example of the cost table 35 shown in FIG. 3 corresponds to the cost table 35a shown in FIG. 2, and FIG. 4 corresponds to the cost table 35b shown in FIG.

  In the cost table 35a shown in FIG. 3, for example, even when the driver travels while talking, a coefficient for searching for a route that can continue the talking state as well as possible is used as a road attribute. A table configuration example set accordingly is shown.

  In this cost table 35a, for example, the coefficient is managed as the above-described normal cost and call cost for each road attribute.

  In the example of FIG. 3, when the attribute of the road (simply “attribute” in FIG. 3) is “tunnel”, “range”, “out of range”, for example, the attribute is “tunnel”, the normal cost is 1.0. The call cost is set to 5.0. For example, when the attribute is “range”, the normal cost is set to 1.0 and the call cost is set to 1.0. For example, when the attribute is “out of service area”, the normal cost is set to 1.0 and the call cost is set to 5.0. In addition, the area (corresponding to the calling area) represents, for example, an area where the telephone device 23 can receive radio waves, and is an area where the telephone can be satisfactorily communicated if there are no obstacles blocking the radio waves. Out-of-service area (corresponding to out-of-service area) represents, for example, an area in which the communication device 23 cannot receive radio waves, and is an area in which the call state is expected to deteriorate. Note that the route search process corresponding to the call area will be described in a second embodiment to be described later.

  In the example of FIG. 3, in the normal mode, the normal cost in the tunnel, in the area, and outside the area is equal to 1.0. On the other hand, in the call mode, the call cost in the area is equal to the normal mode, but the call cost in the tunnel and outside the area is set to 5 times.

  In this way, in the normal mode, the route search unit 31 described above makes a light weight during a call between a road link having attributes of “tunnel”, “range”, and “out of range” with another road link. The route is searched without adding a mark, but in the call mode, the route is searched by attaching weight to other road links with respect to the road links having the attributes of “tunnel” and “out of service area”. In other words, road links having the attributes of “tunnel” and “out of service” are not adopted as routes, or are difficult to adopt.

  More specifically, when there are a plurality of candidate road links to be adopted in the route search, the route search unit 31 preferentially adopts the road link with the lowest cost among the road links as the route. In other words, for example, when the candidate road link includes a road link having the attribute “tunnel”, the route search unit 31 has a normal cost coefficient of “tunnel” of 1.0 in the normal mode. Therefore, the route is searched without adding the light weight at the time of a call to the cost of other road links. On the other hand, the route search unit 31 searches for a route with a light weight at the time of a call with respect to the cost of another road link because the coefficient of the cost at the time of the call of the “tunnel” is 5.0 in the call mode. To do. That is, since the cost of the road link is five times that in the normal mode, it is not adopted as a route or difficult to adopt.

  According to such a cost table 35a, the search criterion setting unit 33 sets the route searched by the route search unit 31 as a route that does not travel on a tunnel or a road such as an underground passage that has a similar attribute to the tunnel. The call cost will be set. In the following description, as an example, it is assumed that the search criterion setting unit 33 sets a cost so that a road link whose route is a tunnel attribute is not adopted. Note that the cost table 35a may be provided with a difference in cost between a place where radio wave reception is good and a place where it is not good in the call area, instead of dividing the cost table 35a into two within and outside the area.

The route search device in the navigation device 100 is one configuration example as described above. Next, an example of a route search method according to the one configuration example will be described with reference to FIGS. 1 to 3. This route search method is configured by steps that the route search program causes the CPU 7 to execute. This route search method includes route search processing according to the presence / absence of a telephone call, which will be described later. Prior to the route search process according to the presence / absence of a call, the search reference setting unit 33 first executes the following cost setting process. In this cost setting process, the search reference setting unit 33 sets the cost used for searching the route by the route searching unit 31 as follows.
<First cost setting example>
The cost table 35b shown in FIG. 4 represents an example in which the cost for each road link is set according to the road shape based on the coefficients of the cost table 35a shown in FIG. This cost setting example for each road link shows the contents set by the route search unit 31 based on the coefficients of the cost table 35a shown in FIG. In this embodiment, road links A, B, C, and D are given as an example, and these road links are exemplified as the following road attributes. In other words, it is assumed that road links A, C, and D represent general roads, and road link B represents a tunnel. In addition, the part whose attribute in the illustrated example is blank represents a general road.

  In the example of the cost table 35 b illustrated in FIG. 4, the road link A has an attribute “general road”, a normal cost of 100, and a call cost of 100. The road link B has an attribute “tunnel”, a normal cost of 120, and a call cost of 600.

  The road link C has an attribute of “general road”, a normal cost of 130, and a normal cost of 130. Thus, a road with a normal cost of 130 is a road where the vehicle is somewhat difficult to travel or takes a long time to travel due to, for example, the length of the link, the number of workers, and the shape of the road, which is 100. Represents.

  The road link D has an attribute of “general road”, a normal cost of 200, and a call cost of 200. Thus, a road with a normal cost of 200 is a road where the vehicle is somewhat difficult to travel or takes a long time to travel due to, for example, the length of the link, the number of workers, and the shape, compared to the road with a normal cost of 130. Represents.

That is, in the example of FIG. 4, when the attribute is “general road”, the normal cost and the cost at the time of calling are set so that there is no difference, while when the attribute is “tunnel”, the call is made according to the coefficient shown in FIG. The hourly cost is set to be five times the normal cost. That is, for a road link having an attribute that does not affect the call state during a call, the route is searched without making a difference between the normal cost and the call cost. On the other hand, for road links that have an attribute that affects the call state during a call, that is, it is predicted that the call state will be deteriorated, multiplying the coefficient in FIG. In the call mode, the route is searched at the cost with the difference. In this way, during the route search in the route search unit 31, the road links A, C, and D are not particularly affected in the normal mode and in the call mode, but the road link B is in the call mode in the normal mode than in the normal mode. Is also difficult to adopt as a route.
<Route search process according to whether there is a call>
The route search program described above realizes a route search method by the following steps. First, the outline is as follows.

  This route search program causes the CPU 7 of the navigation device 100 to execute the search reference change step and the route search step in the route search process according to the presence or absence of the call. First, in the search reference changing step, when the communication control unit 32 controls communication with the outside by the communication device 23, the search reference setting unit 33 sets the cost used by the route search unit 31 for searching for a route to the normal cost. Or set the cost at the time of a call. In the route search step, the route search unit 31 searches for a route to the destination using the set cost.

  FIG. 5 is a flowchart illustrating a procedure example of route search processing according to the presence or absence of a call.

  First, for example, the driver performs a predetermined operation on the navigation device 100. This predetermined operation is, for example, an operation for setting a destination or an operation for starting a route search. When this operation command is received, a route search by the route search unit 31 is started under the control of the CPU 7 and operates as follows.

  First, in step S1, it is determined whether or not the call control unit 32 controls the call device 23, that is, whether or not the call flag is ON. If the call flag is OFF, the cost table 35a shown in FIG. 3 is switched to the normal cost (step S2). On the other hand, if the call flag is ON, the cost cost table 35a is switched to the call cost (step S3).

  Next, in step S4, the route search unit 31 calculates a route to the destination using the normal cost or the call cost thus switched. At the time of such route calculation, the cost of each road link A, B, C, D is calculated, resulting in a normal cost and a call cost as shown in FIG. Specifically, the route search unit 31 calculates a route using a normal cost in the normal mode. On the other hand, the route search unit 31 calculates a route using the call cost in the call mode. The routes in the normal mode and the call mode are as follows.

  First, in the normal mode, when a route from the current location 63 to the destination 62 shown in FIG. 6 is calculated, the road links B and D are candidate road links between the road link A and the road link C. Since the cost 120 of the road link B is lower than the cost 200 of the road link D from the normal cost shown in FIG. 4 in these road links, the route search unit 31 adopts the road link B as a route, and the road links A, B , C, the route to the destination 62 is calculated. The position 61 represents the guidance start point.

  On the other hand, even in the call mode, when the route from the current location 63 to the destination 62 shown in FIG. 7 is calculated, the road links B and D are set as candidate road links between the road link A and the road link C. . Since the cost 600 of the road link B is higher than the cost 200 of the road link D from the cost at the time of the call shown in FIG. 4 in the road links, the route search unit 31 adopts the road link D as a route, and the road links A, The route to the destination 62 by D and C is calculated. That is, the route search unit 31 searches for a route that bypasses the road link B (tunnel) that is predicted to deteriorate the call state by the call device 23, and a route that passes through A, D, and C.

  Here, when it is determined that the vehicle has already passed the road link B (tunnel) in FIG. 6 and cannot be avoided by other road links when the route calculation is completed in the call mode. You may make it output from the speaker 18 with a sound that the vehicle will pass a tunnel from now on, or you may make it display on the display 15. FIG.

  In the present embodiment, for example, when the vehicle is traveling according to the route searched in the normal mode, the driver starts a call using the call device 23, that is, the call control unit 32 sets the call flag from OFF. Triggered by the fact that the telephone device 23 is controlled to be turned on, the call mode is set, the search reference setting unit 33 sets the call cost shown in FIG. 4, and the route search unit 31 triggers this. In addition, the route to the destination may be recalculated using the call cost.

  On the other hand, in the present embodiment, for example, when the vehicle is traveling according to the route searched in the call mode, the driver ends the call using the call device 23, that is, the call control unit 32 turns on the call flag. When the call control of the call device 23 is terminated from the start to the normal mode, the normal mode is set, the search reference setting unit 33 sets the normal cost shown in FIG. 4, and the route search unit 31 is triggered by this. In addition, the route to the destination may be recalculated using the call cost.

Next, the route search program causes the guide unit 34 to execute a guide process (corresponding to a guide step) that guides the vehicle according to the route newly searched by the route search unit 31 described above. In this guidance process, the guidance unit 34 presents a route (hereinafter referred to as a guidance route) as a search result to the driver and passengers visually or auditorily. Specifically, in this guidance process, the graphic controller 13 is controlled by the control of the CPU 7, and the display control unit 14 displays the guidance route on the display 15, or the guidance corresponding to the guidance route is output as sound from the speaker 18. Let
<Second cost setting example>
FIG. 8 is a diagram showing a second configuration example of the cost table 35 shown in FIG.

  The cost table 35c has substantially the same table structure as the cost table 35a shown in FIG. 3, but the cost is determined for each attribute such as a tunnel in FIG. 3, whereas in FIG. The cost is determined based on The cost determined based on this factor is defined as the factor cost. The attributes in FIG. 3 and the elements in FIG. 8 are substantially the same in that they are items that should have a difference in cost, but are different in the following points.

  That is, the attribute in FIG. 3 is, for example, a case where even if the driver travels while talking, considering that the talking state is continued as well as possible, that is, considering reception of radio waves by the calling device 23 8 is a matter that should make a difference in cost, for example, the element in FIG. 8 is, for example, a case where the driver makes it relatively easy to travel while talking, that is, the driver makes a call using the call device 23. However, when considering the driving operation of the vehicle, it is a matter that should make a difference in cost.

  In the example of FIG. 8, in this cost table 35c, for example, the normal cost in the element cost of which the element is “turn right” is 150, and the call cost is set to 300 and double. Further, in the cost table 35c, for example, the cost at the time of a call at the element cost having the elements “left turn” and “U turn” is set to be twice the normal cost. Further, in the cost table 35c, the cost at the time of calling is set to several times the normal cost as shown in the drawings for the other elements. Among these, in particular, for example, the cost at the time of calling in the element cost where the elements are “construction site” and “railway” is set to be much higher than the normal cost.

  In this way, the route search unit 31 described above sets the normal cost as the element cost shown in FIG. 8 in the normal mode, and sets the call cost as the element cost shown in FIG. 8 in the call mode. And according to the setting of such element cost, the cost for every road link and the cost (turn cost) required for the movement between road links are calculated | required. The cost for each road link is calculated by adding the road link distance (link length) or the like to the element cost shown in FIG. 8, and adding the added value to the coefficient or road width according to the road attribute shown in FIG. It is calculated by multiplying the corresponding coefficient. By making a difference between the normal cost and the call cost as the element cost, the cost for each road link and the turn cost are also different in the normal time and the call cost, and thus have the elements shown in FIG. The cost of the road link becomes high in the call mode, and a route that avoids the road is searched.

  More specifically, the route search unit 31 calculates a cost in a road link to the destination, and searches for a route having the minimum cost. That is, the route search unit 31 has a particularly high cost when calling a road link including elements such as a right turn and a U-turn in the call mode. Search for routes that do not include.

  According to such a cost table 35c, when the call flag is ON, that is, when the call control unit 32 controls the call in the call device 23, the search reference setting unit 33 is shown in FIG. A call cost is set as an element cost, and the route search unit 31 calculates a cost for each road link based on the set call cost and searches for a route to the destination using the determined cost.

  That is, the search reference setting unit 33 sets the element cost such as right turn or U turn in the call mode to a cost that is remarkably higher than that in the normal mode. Therefore, the route search unit 31 performs this right turn or U turn as much as possible. The route will be searched to the destination so as to reduce it. In this way, the driver makes his / her vehicle go straight or turn left along a relatively easy-to-run route even when the driver is slightly difficult to concentrate on the call using the call device 23. , You can move to the destination.

  In the call mode, for example, attention must be paid to unexpected children jumping out near the school, for example. Therefore, the search reference setting unit 33 sets a call cost that is higher than the call cost. . In the call mode, for example, there is a possibility that the call may be disturbed by noise near a construction site or a railway line. Therefore, in order to avoid this, the search reference setting unit 33 sets the cost for the call for the road links representing these. May be set significantly higher than the normal cost. Note that the cost setting shown in FIGS. 3 and 4 described above and the cost setting shown in FIG. 8 are not contradictory, and both cost settings can be used simultaneously.

  FIG. 9 is an image diagram showing an example of a route searched in the normal mode. FIG. 9 shows a display example on the display 15.

  According to the cost table 35c shown in FIG. 8, in the normal mode, element costs such as a right turn are set according to the road shape and the like. The route search unit 31 searches for a route from the current location 61 of the vehicle to the destination 62 so that the cost of the road link is minimized, for example, while using the normal cost of the cost table 35c.

  FIG. 10 is an image diagram showing an example of a route searched in the call mode. FIG. 10 shows a display example on the display 15.

  In this example, the search reference setting unit 33 changes the normal cost to the call cost so as to minimize the number of times the vehicle bends on the route searched by the route search unit 31. In addition, it is desirable that the search reference setting unit 33 changes the cost so that the left turn is given priority over the right turn as much as possible when the vehicle turns to the left, for example.

  The call device 23 is not limited to a call device that is used by a user such as a driver as described above to make a call with the outside of the vehicle. Specifically, an example of such a communication device may be an information terminal such as a PDA (Personal Digital Assistant).

  As described above, the route search device in the above embodiment is a route search device that searches for a route to a destination using a search criterion, and whether or not there is a call in the call device 23 that can make a call with the outside. Accordingly, the route search means 31 for searching for a route using either a normal search criterion (corresponding to a normal cost) or a specific search criterion (corresponding to a call cost) different from the normal search criterion. Prepare.

  In this way, the route searching means 31 normally operates independently of the telephone device 23, but operates in cooperation with the telephone device 23 as necessary. That is, the route search means 31 searches for a route using a normal search criterion when the driver of the vehicle is not communicating such as a call using the call device 23, for example. On the other hand, the route search means 31 searches for a route using a specific search reference when the driver of the vehicle is communicating using the communication device 23, for example.

  Thus, the route search means 31 changes the search reference (corresponding to the cost) to be used for the route search, for example, depending on whether or not the driver of the vehicle is communicating using the communication device 23. For this reason, when the driver is driving while communicating using the communication device 23, the route search means 31 guides the vehicle in accordance with a specific search criterion. With this setting, the driver can drive safely even during a call. In addition, such a route search device can smoothly search for a route using a specific search criterion as needed while leaving the ease of use when a route is searched using a normal search criterion. it can.

  The route search method in the above embodiment includes a call determination step for determining whether or not there is a call in the call device 23 capable of making a call with the outside, and a normal search criterion or the normal search according to the determination result. A route search step for searching for a route to the destination using any one of the specific search criteria different from the criteria.

  According to this route search method, a route to the destination is searched using a normal search criterion or a specific search criterion according to the presence or absence of a call in the communication device 23. That is, in this route search method, for example, depending on whether or not the driver of the vehicle is communicating using the communication device 23, the search reference (corresponding to the cost) to be used for the route search is changed to the destination. To search for the route.

  According to this route search method, for example, when the driver is driving while performing communication using the communication device 23, the vehicle is guided according to a specific search criterion. If the setting is appropriate, the driver can drive safely even during a call. In addition, such a route search method can smoothly search for a route using a specific search criterion as needed while leaving the usability when a route is searched using a normal search criterion. it can.

  The route search program in the embodiment includes a call determination step for determining whether or not there is a call in the call device 23 capable of making a call with the outside, and a normal search criterion or the normal search according to the determination result. A route search step for searching for a route to the destination using any one of the specific search criteria different from the criteria is executed by the computer.

  According to this route search program, the computer is caused to search for a route to the destination using a normal search criterion or a specific search criterion depending on whether or not there is a call in the communication device 23. In other words, this route search program changes the search reference (corresponding to the cost) to be used for the route search depending on whether the driver of the vehicle is communicating using the communication device 23, for example, to the destination. To search for the route.

  According to this route search program, for example, when the driver is driving while performing communication using the communication device 23, the vehicle is guided according to a specific search criterion. If the setting is appropriate, the driver can drive safely even during a call. In addition, such a route search program can smoothly search for a route using a specific search criterion as necessary while leaving the ease of use when a route is searched using a normal search criterion. it can.

  In the route search device in the above embodiment, in addition to the above configuration, the route search means 31 searches for a route using the specific search criteria according to outgoing call, incoming call or call in the call device 23. To do.

  In this way, when the state of the communication device 23 is outgoing, incoming, or in a call, the vehicle is guided according to a specific search criterion. Therefore, if this specific search criterion is set to a desired appropriate setting, The driver can drive safely even during a call.

  In the route search device in the above embodiment, in addition to the above configuration, the control means 32 for controlling the call in the call device 23, and the search criteria used for the route search according to the presence or absence of control in the control means 32 Is set as either a normal search criterion or a specific search criterion, and the route search means 31 searches for a route using the set search criterion.

  In this way, the search reference setting unit 33 accurately determines whether the state of the call device 23 is outgoing, incoming, or busy according to the presence / absence of control by the control unit 32, and is used for searching for a route. The search criteria have been changed. Since the vehicle is guided according to a specific search criterion, if the specific search criterion is set to a desired appropriate setting, the driver can perform safe driving even during a call.

  In the route search device in the above embodiment, in addition to the above configuration, the control means 32 further allows the user to make a call with the outside without requiring the user to directly operate by hand. The telephone call in the telephone device 23 is controlled.

  In general, the communication device 23 of such a form is said to be relatively safe even if the driver uses a moving body such as a vehicle while driving, but the driver's ability to concentrate on driving is still low. There is a tendency to be somewhat dull compared to when not in a call. However, according to the configuration as described above, when the driver is making a call using the communication device 23, the route search means 31 searches for a route according to a specific search criterion different from the normal search criterion. If this specific search criterion is appropriately set, the driver can travel to a desired destination relatively safely along this route.

  In the route search device in the above embodiment, in addition to the above configuration, the route search means 31 searches for a route for the moving body to move to the destination, and the search reference setting means 33 is the control means. When 32 is controlling a call in the call device 23, the specific search reference is set so that the route takes into consideration the ease of movement of the moving body during the call.

  If it does in this way, the control means 32 will grasp | ascertain at any time whether the driver is talking using the telephone apparatus 23, and the search reference | standard setting means 33 is in a telephone call using the telephone apparatus 23. Change search criteria. As a result, the route search means 31 searches for a route on which the moving body is easy to move, and the driver can drive safely.

  In the route search device in the embodiment, in addition to the above configuration, the search reference setting unit 33 further includes a call state in the call device 23 when the control unit 32 controls a call in the call device 23. The specific search criterion is set so as to make the path to reduce the deterioration of.

  If it does in this way, even if the driver is communicating using the communication device 23 while driving the vehicle, the communication device 23 is easy to receive radio waves, and communication by the driver is not easily interrupted.

  In the route search device in the above embodiment, in addition to the above configuration, the route search means 31 searches for a route for the moving body to move to the destination, and the search reference setting means 33 is the control means. When 32 is controlling a call in the call device 23, the specific search criterion is set so that the route of the mobile body is small.

  In this way, even if the driver performs communication such as a call using the call device 23 while driving a moving body such as a vehicle, the number of right turns and the like on the route to the desired destination is small. Can be safely guided to the desired destination without dispersing attention. Further, when the vehicle is guided so that the number of times the vehicle bends is reduced, the voice guidance accompanying the guidance is less likely to disturb the call.

  In the route search device in the above embodiment, in addition to the above configuration, the route search means 31 searches for a route for the moving body to move to the destination, and the search reference setting means 33 After the movement starts, the search reference used by the route search unit 31 is changed when the control by the control unit 32 is started or ended.

  In this way, the route search means 31 uses this specific search criterion when the driver starts using the communication device 23 or ends after the mobile body starts moving to the destination. Search for a route. Then, the driver can safely move on the moving body along the route searched using the specific search criteria.

  In the route search device in the above embodiment, in addition to the above configuration, the route search means 31 recalculates the route triggered by the start or end of the call in the call device 23.

  In this way, the route search means 31 recalculates the route when the driver starts or ends the call using the communication device 23. Then, the driver can safely move with a moving body such as a vehicle along the route recalculated according to the change in the situation.

  In the route search device in the above embodiment, in addition to the above configuration, the cost management means 35, 35a for managing the cost of the road link as the search reference as a specific cost different from the normal cost and the normal cost. , 35b, 35c, and the search reference setting means 33 has the normal cost or the specific cost of the cost management means 35, 35a, 35b, 35c depending on the presence / absence of a call in the call device 23. Use either to search for a route.

  In this way, if an appropriate normal cost and a specific cost are prepared in the cost management means 35 or the like, the route search means 31 can specify a different from the normal cost when the communication device 23 is communicating. It is possible to search for a route that the driver can easily travel using For this reason, the driver can arrive at a desired destination relatively safely while communicating using the communication device 23.

  The navigation device 100 according to the embodiment includes the route search device having any of the above-described configurations, and a guide device 34 (corresponding to a guide unit) that guides the vehicle according to the route searched by the route search device.

In this way, when the driver makes a call using the communication device 23 while the driver is driving, the guidance device 34 follows a route searched according to a specific search criterion different from the normal search criterion. A moving body such as a vehicle can be guided. For this reason, even if the driver makes a call using the call device 23, the driver can be safely guided to the destination.
<Second Embodiment>
FIG. 11 is a block diagram illustrating a configuration example of software that operates in the navigation device 100a according to the second embodiment.

  The navigation device 100a according to the second embodiment has substantially the same configuration as the navigation device 100 according to the first embodiment and performs substantially the same operation. For this reason, in the second embodiment, the same configurations and operations are denoted by the same reference numerals as those in FIGS. 1 to 10 in the first embodiment, and the description thereof is omitted. In the following description, differences will be mainly described. .

  The navigation device 100a includes a route search unit 31a instead of the route search unit 31 in the first embodiment, and also includes call area data 37.

  This route search unit 31a has substantially the same function as the route search unit 31 in the first embodiment, but differs in the following points. That is, the route search unit 31a executes route search processing for maintaining a call when the call flag is ON. The route search unit 31a executes a route search process for maintaining the call instead of or together with the route search process according to the presence or absence of the call in the first embodiment. This route search process for maintaining a call is a process of searching for a route so that the vehicle travels as much as possible in a call area in which radio waves can be received by the call device 23.

  The call area data 37 is information representing a receivable range in which the above-described call device 23 can continuously receive radio waves necessary for continuation of a call in sufficient collaboration. In the present embodiment, this receivable range is called a “call area”. The call area data 37 can be obtained in advance from a provider of the call device 23, for example.

  The call area data 37 is associated with links and nodes included in the map data. That is, the call area data 37 is information for specifying a call area on an electronic map based on the map data and displaying a display form in which the call area is superimposed on the electronic map and mapped. The call area data 37 is stored in the recording medium 16, for example.

  The search reference setting unit 33 sets the cost of a road link located outside the call area based on the call area that can be derived from the above-described call area data 37. Alternatively, the search reference setting unit 33 instead estimates the strength of the radio wave based on the distance from the nearest base of each road link from the data of the location of the radio relay base antenna of the communication device 23 and responds accordingly. It is also possible to adopt a mechanism for setting the cost of each road link.

  FIG. 12 is a flowchart illustrating a procedure example of route search processing for maintaining a call. This flowchart represents an outline of route search processing included as part of the route search method. The route search program causes the route search unit 31a to execute route search processing for maintaining the call under the control of the CPU 7.

  First, the route search unit 31 a acquires a range in which radio waves can be received by the call device 23 (corresponding to the call range) based on the call range data 37. That is, the call area data 37 represents information indicating a range (corresponding to the above call area) in which radio waves are received by the call device 23 and communication for a call is possible.

  First, in step S11, the route search unit 31a determines whether a guidance process is currently being executed by the guidance unit 34. The route search unit 31 ends the route search processing for maintaining the call when the guidance process is not performed by the guidance unit 34, while the guidance process is performed by the guidance unit 34. Next step S12 is executed.

  Next, in step S12, the route search unit 31a determines whether or not the current location of the vehicle is outside the calling area. When the route search unit 31a determines that the current location of the vehicle does not enter the outside of the calling area, the route search processing ends. When the route search unit 31a determines that the current location of the vehicle enters the outside of the communication area, the route search unit 31a causes the search reference setting unit 33 to execute the following step S13.

  In this step S13, the search reference setting unit 33 sets a high cost for road links outside the calling area with respect to the cost setting. Then, the route search unit 31a calculates a new route again based on the new cost setting. Next, in step S14, the route search unit 31a determines whether or not the new route has been searched for a route different from the original route before recalculation. Here, the original route represents a route that is already used for guidance by the guidance unit 34 after the route search has been completed. The route search unit 31a sets a new route as a guide route when a route different from the original route is calculated (step S15), and maintains a call when a different route is not calculated. The route search process is terminated, and the guidance is continued with the original route. However, the route search unit 31a may unconditionally set a new route as the guidance route without determining that these routes do not match.

  Here, in the present embodiment, the route search unit 31a starts searching for a route when the call device 23 receives an incoming call, for example, and replaces it with the searched new route, for example, starts a call. It may be an opportunity. Thereby, the route search unit 31a can switch the route during a call at higher speed.

  Further, in the present embodiment, the route search unit 31a detects the transmission or reception of the call device 23 capable of making a call with the outside by the call control unit 32 (corresponding to detection means), and detects the reception or transmission. When it is determined whether or not the current location of the vehicle is out of the communication range of the call device 23 (corresponding to the outside of the radio wave receiving area) within a predetermined travel time (corresponding to the determination means) As described above, the cost of the road link outside the calling range may be set high when it is determined that

  In the route search device in the embodiment, in addition to the above configuration, the search reference setting unit 33 (corresponding to the search reference setting unit) further controls the call in the call device 23 by the control unit 32. The specific search criterion is set so that the mobile body has a route located as much as possible in the radio wave receivable area to be received by the communication device 23.

  In this way, even if the driver makes a call while the vehicle is moving and is guided by a specific search criterion, the call device 23 can always receive radio waves, so that the driver can communicate without interruption. It can be carried out. Further, since the driver does not have to worry about the communication being interrupted even though the vehicle is traveling, the driver can drive the vehicle more safely even while communicating.

  In the route search device in the embodiment, in addition to the above configuration, the search reference setting unit 33 further includes a call state in the call device 23 when the control unit 32 controls a call in the call device 23. The specific search criterion is set so as to make the path to reduce the deterioration of.

  If it does in this way, even if the driver is communicating using the communication device 23 while driving the vehicle, the communication device 23 is easy to receive radio waves, and communication by the driver is not easily interrupted.

  The navigation device 100a in the embodiment includes the route search device having any of the above-described configurations and a guidance device (corresponding to the guidance unit 34) that guides the vehicle according to the route searched by the route search device.

  In this way, when the driver makes a call using the communication device 23 while the driver is driving, the guidance device 34 follows a route searched according to a specific search criterion different from the normal search criterion. A moving body such as a vehicle can be guided. For this reason, even if the driver makes a call using the call device 23, the driver can be safely guided to the destination.

  In the navigation device 100a in the above embodiment, the detection means for detecting the transmission or reception of the call device 23 capable of making a call with the outside, and the current location of the mobile object when the reception or transmission is detected. Determination means for determining whether or not the radio wave to be received by the call device 23 within a predetermined travel time is outside the receivable area, and if it is determined that the radio wave is out of the receivable area, the reception is possible A route search unit 31a (corresponding to a route search unit) for searching for a route by setting a search criterion for a road outside the region higher than a normal search criterion, and a guiding unit 34 for guiding the mobile body according to the searched route ( Equivalent to the guiding portion).

  In this way, when it is determined that the current location of a moving body such as a vehicle is out of the radio wave reception area within a predetermined travel time when the call device 23 detects a call or an incoming call, the navigation device 100a moves The body is less likely to be guided to roads outside the coverage area. For this reason, the call by the call device 23 is not easily interrupted.

  In addition, this embodiment is not restricted above, A various deformation | transformation is possible. Hereinafter, such modifications will be described in order.

  13 and 14 are each an image diagram showing a display example of the display 15 in the modification of the embodiment.

  In this modification, as in the above embodiment, the route search unit 31 once searches for a route from the current location of the vehicle to a desired destination (hereinafter referred to as “original route”), for example, by the driver. In response to the start of a call using the call device 23, the route may be calculated as follows.

  That is, for example, when the route search unit 31 calculates a route estimated that the travel time of the vehicle from the current location to the desired destination takes about 3 hours, even if a call is made to the call device 23, 3 hours Since it is unlikely that the call will continue over all, instead of recalculating all routes again, the following is done.

  Specifically, the route search unit 31 assumes that the call time by the call device 23 is, for example, 5 minutes, and, as shown in FIG. 13, the route to the point 64 where the vehicle reaches after 5 minutes is based on the call cost. Recalculation may be performed, and the guidance route may be calculated so that the destination is connected to the original route. Hereinafter, a point where the vehicle reaches after 5 minutes in this way is referred to as a “scheduled point after 5 minutes”.

  Then, the vehicle becomes a route 65 guided by the route search unit 31 according to the cost at the time of calling from the current location 61 shown in FIG. Thereafter, as shown in FIG. 14, from the point 64a actually reached after 5 minutes to the desired destination 62, the route 66 is guided by the route search unit 31 according to the normal cost.

  In addition, the route search unit 31 recalculates all the sections, but in advance, the route within the range of 5 minutes is calculated using the call cost, and the subsequent route is calculated using the normal cost. You may do it.

  In addition, the route search unit 31 determines that the call will continue even after 5 minutes if it is still busy before 5 minutes assumed as the call time, for example, about 4 minutes 30 seconds, It may be recalculated. The route search unit 31 may recalculate the route when the call is still in progress after 5 minutes.

  In addition, the route search unit 31 is not limited to the five minutes exemplified as the call time as described above. Instead, the past call time is stored in the recording medium 16 for each user such as a caller. The call time may be predicted based on the call time. Further, the route search unit 31 stores, for example, the past call time in the recording medium 16 for each call destination, and calculates a predicted value of the call time based on the past call time stored in the recording medium 16. You may make it estimate.

  Further, although it is intended to maintain a call by the call device 23, it is not reasonable for the vehicle to make an extreme roundabout while avoiding a tunnel or the like. Therefore, the guiding unit 34 may present to the driver that it is better to stop on the spot until the call by the call device 23 ends. In addition, the route search unit 31 compares the difference in required time between the original route and the newly calculated route, for example, and only when the increment is less than the call time, the guide unit 34 determines a new route. You may make it show. Moreover, it is desirable that the route search unit 31 calculates the guidance route so that the route is not extremely detoured in consideration of the rationality of driving even when using the cost during a call.

  In the above embodiment, for example, when a user such as a driver operates a predetermined re-search button, the route search unit 31 again performs the route search process according to the presence / absence of the call shown in FIG. You may make it perform.

  The re-search button may be in any form as long as it can be operated in the navigation device 100. For example, when the incoming call is received, the re-search button is displayed on the display 15 having a touch panel on the surface. When the touch panel on the surface of the re-search button is turned on, the route search unit 31 executes the route search process according to the presence / absence of the call described above.

  In this way, at the time intended by the driver or passenger, the route search unit 31 is caused to execute the route search process according to the presence or absence of a call shown in the above embodiment, and the driver uses the call device 23. The vehicle can be driven more safely while talking.

  The above embodiment is not limited to a mode in which the navigation device 100 is mounted on a vehicle, but the navigation device 100 may be a simple portable navigation device called PND (Personal Navigation Device), for example. The navigation device 100 may be a navigation device carried by a pedestrian.

  In the above-described embodiment, a route may be guided for the purpose of maintaining a viewing state of a television broadcast or a radio broadcast, for example. Moreover, in the said embodiment, the navigation apparatus 100 can receive the broadcast wave regarding important programs, such as disaster information, and if such a broadcast wave is received, the search reference | standard setting part 33 will be a mountain part, a tunnel, The cost may be changed so as to avoid a path such as a valley of a building that is likely to be disturbed. In this way, safety can be ensured without impairing usability during normal times and without stressing in an emergency.

  Further, in the above-described embodiment, if there are few places where radio waves can be received, such as a current terrestrial digital broadcast or a wireless LAN (Local Area Network) hot spot, the following may be performed. That is, the search reference setting unit 33 sets the cost of a road where radio waves can be received low. Then, the route search unit 31 calculates a route so that the vehicle passes through the receivable road as much as possible.

It is a block diagram which shows the hardware structural example of the navigation apparatus in 1st Embodiment. It is a block diagram which shows the structural example of the software etc. which operate | move in the navigation apparatus shown in FIG. It is a figure which shows the 1st structural example of the cost table shown in FIG. The example which set the cost for every link based on the cost table shown in FIG. 3 is represented. It is a flowchart which shows the example of a procedure of the route search process according to the presence or absence of a telephone call. It is an image figure which shows an example of the guidance path | route in normal mode. It is an image figure which shows an example of the guidance path | route in the mode at the time of a call. It is a figure which shows the 1st structural example of the cost table shown in FIG. It is an image figure which shows an example of the guidance route searched in normal mode. It is an image figure which shows an example of the guidance route searched in the mode at the time of a call. It is a block diagram which shows the structural example of the software etc. which operate | move in the navigation apparatus in 2nd Embodiment. It is a flowchart which shows an example of the procedure of the route search process for the telephone call maintenance in 2nd Embodiment. It is an image figure which shows the example of a display of the display in the modification of the said embodiment. It is an image figure which shows the example of a display of the display in the modification of the said embodiment.

Explanation of symbols

23 Communication device 31 Route search unit (corresponding to route search means)
31a Route search unit (corresponding to route search means)
32 Call control unit (equivalent to control means)
33 Search reference setting unit (corresponding to search reference setting means)
35 Cost table (equivalent to cost management means)
34 Guide part (equivalent to guide device and guide means)
35a Cost table (equivalent to cost management means)
35b Cost table (equivalent to cost management means)
35c Cost table (equivalent to cost management means)
37 Communication area data 100 Navigation device 100a Navigation device

Claims (9)

When a communication device that can communicate with the outside communicates with the outside, a specific search criterion is used to determine the section from the local point to the planned arrival point after a predetermined time after the predetermined time. Guidance means for guiding the route searched using the route searched from the planned arrival point to the destination after the predetermined time according to the route searched using a normal search criterion;
A navigation device comprising: The navigation device according to claim 1, wherein
The communication device controls a call so as to enable a call to the outside without requiring a user to directly operate by hand. The navigation device according to claim 1 or 2,
The navigation device according to claim 1, wherein the specific search criteria is set so that the guide means guides according to a route searched in consideration of easiness of movement of a moving body during communication by the communication device. The navigation device according to claim 3, wherein
A navigation apparatus characterized in that the guiding means guides along a route with a small number of times of bending of a moving body during communication by the communication apparatus. The navigation device according to claim 1 or 2,
A navigation device, wherein the guiding means guides along a route that reduces deterioration of a communication state in the communication device during communication by the communication device. The navigation device according to claim 1 or 2,
A navigation apparatus characterized in that the guiding means guides a mobile body according to a route located as much as possible within a radio wave receivable area to be received by the communication apparatus during communication by the communication apparatus. The navigation device according to any one of claims 1 to 6,
Cost management means for managing the cost of the road link as the search criterion so as to be stored separately from a normal cost and a specific cost different from the normal cost;
The guiding means is
A navigation device characterized in that guidance is performed according to a route searched using either the normal cost or the specific cost in the cost management means in accordance with presence / absence of communication in the communication device. When a communication device capable of external communication with the outside communicates with the outside, a specific search criterion is a section from the local point to the scheduled arrival point after a predetermined time after the predetermined time has elapsed A navigation method characterized by guiding a route searched using a route and a section from the planned arrival point to the destination after the predetermined time according to a route searched using a normal search criterion. A navigation program for causing a computer to execute the navigation method according to claim 8.

Images