JP4989981B2 - Navigation device - Google Patents

Description

  The present invention relates to a navigation device for a vehicle.

  Conventionally, the ratio of paved road to unpaved road in the actual driving route, the ratio of toll road and free road, the weighted average value of the road type, etc. are obtained as the user's route selection factors, and based on these route selection factors 2. Description of the Related Art A navigation device that performs a route search according to a user's preference by updating an evaluation criterion at the time of route search is known (see Patent Document 1).

JP-A-8-327385

  When the user is driving the vehicle according to the route set by the navigation device, if the user determines that the route does not match his / her route selectivity, the user selects the navigation device according to his / her route selectivity. The vehicle may be driven in a direction different from that instructed. However, in the navigation device disclosed in Patent Document 1, the user's route selection tendency when the vehicle deviates from the route in this way cannot be appropriately reflected in the evaluation criteria used during route search.

The navigation device according to claim 1 searches a recommended route to a destination based on a predetermined criterion, entering direction of the navigation apparatus to guide to the destination of the vehicle in accordance with the searched recommended route to the intersection of the vehicle Storage means for storing an evaluation criterion including a value of an intersection cost set based on the angle of the traveling direction from the intersection , a determination means for determining whether or not the vehicle has deviated from the recommended route, and a vehicle by the determination means And adjusting means for adjusting the evaluation criteria when it is determined that the vehicle has deviated from the recommended route, the adjusting device in the direction of travel before the departure that the vehicle should have followed if the vehicle did not deviate from the recommended route. On the other hand, the evaluation cost is adjusted by increasing the value of the intersection cost and decreasing the value of the intersection cost for the direction of travel after the departure when the vehicle deviates from the recommended route. Characterized in that it.

  ADVANTAGE OF THE INVENTION According to this invention, a user's route selection tendency when a vehicle deviates from a route can be appropriately reflected in the evaluation criteria used at the time of route search.

  A configuration of a navigation apparatus according to an embodiment of the present invention is shown in FIG. This navigation device is mounted on a vehicle, and when a destination is set by a user, a recommended route to the destination is searched based on route calculation data in the map data, and the host vehicle is searched according to the searched recommended route. To the destination. When the host vehicle deviates from the recommended route, the route selectivity can be reflected in the next and subsequent route searches by adjusting the route calculation data according to the user's route selectivity. 1 includes a control unit 10, a vibration gyro 11, a vehicle speed sensor 12, a hard disk (HDD) 13, a GPS receiving unit 14, a display monitor 15, a speaker 16, and an input device 17.

  The control unit 10 includes a microprocessor, various peripheral circuits, a RAM, a ROM, and the like, and executes various processes based on a control program and map data recorded in the HDD 13. The control unit 10 executes various processes for guiding the host vehicle to the destination. For example, destination search processing when setting a destination, search processing of a recommended route to the set destination, detection processing of the current position of the host vehicle, various image display processing, voice output processing during route guidance Etc. are executed. Further, the flowchart of FIG. 2 to be described later is executed in the control unit 10, so that when the vehicle deviates from the recommended route, the route calculation data used for searching the recommended route is adjusted in the map data. .

  The vibration gyro 11 is a sensor for detecting the angular velocity of the host vehicle. The vehicle speed sensor 12 is a sensor for detecting the vehicle speed of the host vehicle. By detecting the movement state of the host vehicle at predetermined time intervals using these sensors, the position movement amount of the host vehicle is obtained, and thereby the current position of the host vehicle is detected.

  The HDD 13 is a non-volatile recording medium in which various data including map data are recorded. The HDD 13 records, as user setting data, the setting state of various setting conditions and the adjustment state of the route calculation data for each user. These data recorded in the HDD 13 are read out under the control of the control unit 10 as necessary, and are used for various processes and controls executed by the control unit 10.

  Note that the map data recorded in the HDD 13 further includes route guidance data, road data, and background data in addition to the above-described route calculation data. The route guidance data is data used to guide the host vehicle to the destination according to the set recommended route, and represents, for example, an intersection name or a road name. The road data is data for representing the shape of the road. The background data is data for representing map shapes other than roads such as rivers and railways, and various facilities on the map (landmarks).

  In the above road data, the smallest unit representing a road section is called a road link. That is, each road is constituted by a plurality of road links set for each predetermined road section. In addition, the length of the road section set as one road link differs for every road link, and is not constant. The points connecting the road links are called nodes, and each has position information (coordinate information). This node is set corresponding to an intersection or a branch point. In addition, a point called a shape interpolation point may be set between the nodes in the road link as needed. Each shape interpolation point also has position information (coordinate information) like each node. Based on the position information of the node and the shape interpolation point, the shape of the road link, that is, the shape of the road is determined.

  The GPS receiver 14 receives a GPS signal transmitted from a GPS satellite and outputs it to the controller 10. The GPS signal includes the position and transmission time of the GPS satellite that transmitted the GPS signal as information for obtaining the position of the host vehicle and the current time. Therefore, by receiving GPS signals from a predetermined number or more of GPS satellites, the current position and current time of the host vehicle can be calculated based on these pieces of information.

  The display monitor 15 is a device for displaying various images and videos, and a liquid crystal display or the like is used. For example, when the host vehicle is traveling on the recommended route toward the destination, the display monitor 15 displays an image of a map showing the recommended route around the vehicle position. The display monitor 15 is installed at a position that is easy to see from the driver's seat, for example, on the dashboard of the host vehicle or in the instrument panel. The speaker 16 outputs sound or the like when guiding the host vehicle according to the recommended route under the control of the control unit 10.

  The input device 17 is a device for a user to perform various input operations for operating the navigation device 1 and includes various input switches. The user operates the input device 17 to input, for example, the name of a facility or point desired to be set as the destination, select a destination from registered locations registered in advance, Or scroll in the direction. The input device 17 can be realized by an operation panel, a remote controller, or the like. Alternatively, the input device 17 may be a touch panel integrated with the display monitor 15.

  Here, a method for searching for a recommended route by the navigation device 1 will be described. As described above, route calculation data is recorded in the HDD 13 of the navigation device 1 as part of the map data. This route calculation data represents an evaluation standard used for evaluating each route during route search, and includes at least a link cost, an intersection cost, and a weighting coefficient. The link cost represents the time required for the vehicle to pass through the road, and is set for each road link. The intersection cost represents the time required for the vehicle to pass through the intersection, and is set according to the traveling direction of the vehicle at the intersection. The intersection cost is set to a common value for each intersection on the map. The weighting coefficient is a coefficient for performing weighting reflecting the user's selectivity toward the road type, and is set according to the road type.

  When the destination is set by the user's input operation using the input device 17, the navigation device 1 determines each route evaluation value for a plurality of routes based on each evaluation criterion as described above included in the route calculation data. Is calculated. At this time, for all road links included in each route, a value obtained by multiplying the link cost by a weighting coefficient corresponding to the road type is added, and further, an intersection cost corresponding to the traveling direction for all intersections included in each route. Is added, the route evaluation value for each route is calculated. The route with the smallest route evaluation value is set as the recommended route.

  The recommended route obtained by the method described above is displayed on the map separately from other roads by changing the display form, for example, the display color. Thereby, the user can recognize the recommended route on the map screen displayed on the display monitor 15. Moreover, the navigation apparatus 1 guides the host vehicle by instructing the user in the traveling direction by an image or sound so that the host vehicle can travel according to the recommended route. Thus, route guidance to the destination is performed by displaying the map and guiding the vehicle to the destination according to the recommended route.

  Next, a method of adjusting the route calculation data in accordance with the user's route selectivity when the host vehicle deviates from the recommended route will be described with reference to the flowchart of FIG. This flowchart is executed in the control circuit 10 when the navigation apparatus 1 is powered on. In the following, the description will proceed according to the flowchart of FIG.

  In step S10, the user who uses the navigation device 1 is specified. This user identification can be performed based on, for example, key information from the host vehicle. That is, different keys are distributed and delivered to a plurality of users who drive the vehicle. And when the door lock of the own vehicle is cancelled | released by any user, the information which shows which key the user used is transmitted from the own vehicle to the navigation apparatus 1 as key information. Based on the key information transmitted in this way, the navigation device 1 can identify the user.

  Alternatively, the navigation device 1 may allow the user to input a password, an ID number, or the like when the power is turned on. Even in this case, the user can be specified from the input password or ID number. Furthermore, it is good also as specifying a user based on biometric information, such as a fingerprint. In addition, the user can be specified by various methods.

  In step S20, the setting information about the user specified in step S10 is called. Here, the setting state of various setting conditions, the adjustment state of route calculation data, and the like are called as the setting information of the user. The setting information is recorded in the HDD 13 as user setting data for each user as described above.

  In step S30, it is determined whether route guidance is being performed. When the route is being guided, that is, when a recommended route to the set destination is searched and the host vehicle is traveling according to the recommended route, the process proceeds to the next step S40. On the other hand, if the route is not being guided, the process stays at step S30.

  In step S40, it is determined whether the host vehicle has deviated from the recommended route. If the host vehicle deviates from the recommended route, that is, if the user runs the host vehicle ignoring route guidance by the navigation device 1 and the position of the host vehicle deviates from the recommended route, the process proceeds to the next step S50. move on. On the other hand, if the host vehicle continues to travel according to the recommended route without departing from the recommended route, the process returns to step S30.

  In step S50, it is determined whether or not the current position of the host vehicle is within a predetermined distance (for example, 2 km) set in advance from the home. If the current position of the host vehicle is within a predetermined distance from the home, the process returns to step S30. As a result, in the place within a predetermined distance from the home, the adjustment of the route calculation data is prohibited without executing the processing after step S60. In this way, in the vicinity of the home where the user is familiar with fine roads, even if the vehicle deviates from the recommended route, the deviation is not due to the user's route selectivity, and the route calculation data is adjusted. Do not do.

  In step S60, it is determined whether or not the road type has changed before and after the vehicle deviates from the recommended route. If the road type has changed before and after the departure, the process proceeds to step S70, and if not changed, the process proceeds to step S100. In the determination of step S60, the road type of the road link that should have traveled next unless the host vehicle deviates from the recommended route, and the road link that traveled when the host vehicle deviated from the recommended route. When the road type is different, it is determined that the road type has changed before and after the departure.

  Here, how the road type changes before and after the vehicle deviates from the recommended route will be described. FIG. 3 shows an example of the relationship between the vehicle position and the road link before and after departure, where (a) shows the state before departure and (b) shows the state after departure. In FIG. 3, reference numeral 20 denotes a host vehicle position mark indicating the host vehicle position, and reference numeral 21 denotes a node corresponding to the intersection. The straight lines with reference numerals 22, 23 and 24 indicate road links, respectively, of which the road links 22 and 23 are included in the recommended route, but the road link 24 is not included in the recommended route.

  Before the departure of (a), since the vehicle position mark 20 is on the road link 22 included in the recommended route, it can be seen that the host vehicle is traveling on the recommended route. On the other hand, after the departure from (b), since the vehicle position mark 20 is on the road link 24 not included in the recommended route, it can be seen that the vehicle is not traveling on the recommended route. That is, at the intersection represented by the node 21, the host vehicle that should have been going straight from the road link 22 to 23 according to the recommended route turns right and proceeds to the road link 24. You can see that it has deviated. In such a case, the road link 23 that should have traveled next unless the host vehicle deviates from the recommended route is referred to as a road link before the departure. Further, the road link 24 that the vehicle has traveled when deviating from the recommended route is referred to as a post-departure road link.

  In the situation as described above, if the road type of the road link 23 before the departure and the road type of the road link 24 after the departure are different, it is determined in step S60 that the road type has changed before and after the departure. Is done. For example, it is assumed that the road type of each road link in the map data is classified into one of “highway”, “national road”, “prefectural road”, “general road”, or “narrow street” according to the type of road. At this time, for example, the road type of the road link 23 before the departure is “national road” and the road type of the road link 24 after the departure is “prefectural road”, or the road type of the road link 23 before the departure is opposite. If it is “prefectural road” and the road type of the road link 24 after departure is “national road”, it is determined in step S60 that the road type has changed before and after the departure. The same applies to other road types.

  In the above description, the road type of each road link is classified according to the type of road, but other classification methods can also be used. For example, the road type can be classified according to the width of the road or the speed limit.

  When the process proceeds from step S60 to step S70, in step S70, it is determined which of the road link before the departure and the road link after the departure has a higher rank of the road type. If the road type before the departure has a higher rank of the road type, that is, if the road link after the departure has a lower rank of the road type than the road link before the departure, the process proceeds to step S80. On the other hand, if the road link after the departure has a higher rank of the road type than the road link before the departure, the process proceeds to step S90.

  For example, if the road type of each road link is classified as “highway”, “national road”, “prefectural road”, “general road” or “narrow street” as described above, the rank of this road type is “highway” Roads, national roads, prefectural roads, general roads, and narrow streets are set higher in this order. Therefore, as described above, when the road type of the road link 23 before the departure is “national road” and the road type of the road link 24 after the departure is “prefectural road”, the road link 23 before the departure is the road. Since the rank of the type is high, the process proceeds from step S70 to step S80. On the other hand, if the road type of the road link 23 before departure is “prefectural road” and the road type of the road link 24 after departure is “national road”, the road link 24 after departure is of the road type. Since the rank is high, the process proceeds from step S70 to step S90. Similar determinations are made for other road types.

  When the process proceeds from step S70 to step S80, in step S80, the weight in the route calculation data is assigned to the road type having a rank of “prefectural road” or lower, that is, the road type of “prefectural road”, “general road”, or “narrow street”. Decrease the coefficient. For example, a weighting factor of 10 is set for “highway”, 30 for “national road”, 50 for “prefectural road”, 70 for “general road”, and 100 for “narrow street”. . In such a case, the weighting coefficient of “prefectural road” is decreased from 50 to 40, for example, the weighting coefficient of “general road” is decreased from 70 to 45, and the weighting coefficient of “narrow street” is decreased from 100 to 80, for example. Thereby, the route calculation data is adjusted according to the user's route selection tendency at the time of departure from the route.

  On the other hand, when the process proceeds from step S70 to step S90, in step S90, the weighting coefficient in the route calculation data is lowered for the road type having a rank of “National road” or higher, that is, the road type of “highway” or “national road”. . For example, the weighting coefficient of “highway” is decreased from 10 to 5, and the weighting coefficient of “national road” is decreased from 30 to 20. Thereby, the route calculation data is adjusted according to the user's route selection tendency at the time of departure from the route.

  Note that the adjustment method of the route calculation data in steps S80 and S90 described above is merely an example, and other adjustment methods may be used. In step S80, for road types other than “prefectural roads”, for example, “national roads”, the weighting factors of road types with lower ranks may be lowered. Alternatively, by increasing the weighting coefficient of a road type having a higher rank than a predetermined road type, the weighting coefficient of a road type having a lower rank may be relatively decreased. Similarly, in step S90, the weighting coefficient of a road type with a higher rank may be lowered for other road types, such as “prefectural roads” and “general roads”, instead of “national roads”. Alternatively, by increasing the weighting coefficient of a road type having a lower rank than a predetermined road type, the weighting coefficient of a road type having a higher rank may be relatively decreased.

  That is, if the road link after the departure has a higher rank of the road type than the road link before the departure, in step S90, the weighting coefficient is set for the road type having a higher rank than the predetermined first road type. Make it relatively small. On the other hand, if the road link after the departure has a lower rank of the road type than the road link before the departure, a weighting coefficient is set for the road type with a lower rank than the predetermined second road type in step S80. Make it relatively small. In this way, the route calculation data is adjusted.

  When the process of step S80 or S90 is executed as described above, the process proceeds to step S100. In step S100, the route calculation data is adjusted by changing the intersection cost according to the change in the traveling direction before and after the departure. Here, the intersection cost is relatively large for the traveling direction before the departure, that is, the traveling direction that the vehicle should have followed if it did not deviate from the recommended route, and conversely, the traveling direction after the departure. That is, the intersection cost is made relatively small with respect to the traveling direction in which the own vehicle deviates from the recommended route. By changing the intersection cost in this way, the route calculation data is adjusted in accordance with the route selectivity of the user at the time of departure from the route.

  The manner in which the intersection cost is changed in step S100 will be described below. FIG. 4 shows an example of the intersection cost set for each traveling direction. In the example of FIG. 4, the intersection cost is set to 10 in a range in which the traveling direction, that is, the exit direction from the intersection is close to the straight direction with respect to the approach direction to the intersection. And as the angle between the approach direction to the intersection and the exit direction from the intersection becomes smaller, the intersection cost gradually increases to 20, 30, 40 for the right turn direction, 15, 20, 30 for the left turn direction. It is set to be large. At this time, a larger intersection cost is set in the right turn direction than in the left turn direction. Further, the intersection cost is set to 50 at the maximum for the escape direction returning to the traveling direction. As described above, the intersection cost is set based on the angle between the approach direction to the intersection and the exit direction from the intersection.

  When the intersection cost as shown in FIG. 4 is set, it is assumed that the vehicle deviates from a recommended route extending in a straight line direction from the intersection by turning right at the intersection. In this case, the intersection cost is relatively increased by increasing the intersection cost from 10 to 15, for example, in the straight direction that is the traveling direction before the departure. On the other hand, for the right turn direction, which is the direction of travel after departure, the intersection cost is relatively reduced by lowering the intersection cost to, for example, 20 to 15, 30 to 25, and 40 to 35. On the other hand, for example, it is assumed that the host vehicle deviates from a recommended route extending in the right turn direction from the intersection by going straight through the intersection. In this case, the intersection cost is relatively increased by increasing the intersection cost from 20 to 25, 30 to 35, and 40 to 45, for the right turn direction that is the traveling direction before the departure. On the other hand, for the straight traveling direction after the departure, the intersection cost is relatively reduced by lowering the intersection cost from 10 to 5, for example. At this time, only one of the traveling direction before departure and the traveling direction after departure may be changed. In this way, the route calculation data is adjusted.

  When the process of step S100 is executed as described above, the process proceeds to step S110. In step S110, a reroute calculation for searching for a new recommended route is performed. At this time, the reroute calculation is executed based on the route calculation data reflecting the adjustment result of the weighting coefficient in step S80 or S90 described above and the adjustment result of the intersection cost in step S100. Thus, a new recommended route from the vehicle position to the destination is searched by reflecting the user's route selection tendency when the vehicle deviates from the route. If step S110 is performed, it will return to step S30 and the process demonstrated above will be repeated.

According to the embodiment described above, the following operational effects can be achieved.
(1) It is determined whether or not the host vehicle has deviated from the recommended route (step S40). If it is determined that the vehicle has deviated, route calculation data representing an evaluation criterion at the time of route search is adjusted (steps S80 and S90). S100). Since it did in this way, a user's route selection tendency when the own vehicle deviates from a route can be appropriately reflected in an evaluation standard used at the time of route search.

(2) When it is determined in step S40 that the host vehicle has deviated from the recommended route, it is further determined whether or not the road type has changed before and after the departure (step S60), and it has been determined that the road type has changed. Only in this case, the process of step S80 or step S90 is executed. Thereby, it is determined in step S40 that the own vehicle has deviated from the recommended route, and if the vehicle does not deviate from the recommended route, the road type of the road link before deviating and the vehicle recommended When the road type of the road link after the departure traveled when the route deviates is different, the route calculation data is adjusted in step S80 or step S90. Since it did in this way, it judges exactly whether the deviation of a route originates in a user's route selectivity, and when it originates in a user's route selectivity, the route selectivity is used for route search. It can be reflected.

(3) It is determined which of the road link before the departure and the road link after the departure has a higher rank of the road type (step S70). As a result of this determination, if the road link after the departure has a higher rank of the road type than the road link before the departure, the weighting coefficient is relatively set for the road type with a higher rank than the predetermined road type. The route calculation data is adjusted by making it smaller (step S90). Also, when the road type rank after the departure road link is lower than the road link before departure, the weighting coefficient is made relatively small for the road type with a lower rank than the predetermined road type. The route calculation data is adjusted (step S80). Since it did in this way, route calculation data can be adjusted appropriately according to a user's route selection tendency.

(4) If the vehicle did not deviate from the recommended route, the intersection cost should have been made relatively large with respect to the direction of travel before the departure, and the vehicle proceeded when the vehicle deviated from the recommended route. The route calculation data is adjusted by relatively reducing the intersection cost for the direction of travel after the departure (step S100). Since it did in this way, route calculation data can be adjusted more appropriately according to a user's route selection tendency.

(5) Since the intersection cost is set on the basis of the angle between the approach direction to the intersection and the exit direction from the intersection, the intersection cost is set by accurately reflecting the user's route selectivity. Can do.

(6) The user is specified (step S10), and the adjustment state of the route calculation data recorded in the HDD 13 is called for each specified user (step S20). Since it did in this way, a route search can be performed using optimal route calculation data for every user.

(7) It is determined whether or not the vehicle position when deviating from the recommended route is within a predetermined distance from the home (step S50), and if it is within the predetermined distance from the home, adjustment of the route calculation data is prohibited. It was decided. In this way, in the vicinity of the home where the user is familiar with fine roads, even if the vehicle deviates from the recommended route, the deviation is not due to the user's route selectivity, and the route calculation data is adjusted. It can be avoided.

  In the embodiment described above, in step S80 or S90, the route calculation data is adjusted by changing the weighting coefficient for a predetermined road type. The road type for changing the weighting coefficient may be determined accordingly. That is, when it is determined in step S70 that the road type after the departure has a higher rank of the road type than the road link before the departure, in step S90, the road type that is the same as or higher in rank than the road link after the departure. The route calculation data is adjusted by making the weighting coefficient relatively small. If it is determined in step S70 that the road type after the departure has a lower rank of the road type than the road link before the departure, in step S80, the road type that is the same as or lower in rank than the road link after the departure. The route calculation data is adjusted by making the weighting coefficient relatively small. In this way, the route calculation data can be adjusted more appropriately according to the user's route selectivity.

  Further, in adjusting the route calculation data by changing the weighting coefficient and the intersection cost in step S80, S90 or S100, the adjustment amount may be changed according to the number of times the own vehicle deviates from the recommended route. . That is, as the number of times that the vehicle deviates from the recommended route increases, the user's route selectivity can be further reflected by increasing the adjustment amount of the weighting coefficient and the intersection cost in the route calculation data accordingly.

  In the above case, when the power of the navigation device 1 is cut for a predetermined time or longer, the weighting coefficient in the route calculation data and the adjustment amount of the intersection cost when the own vehicle deviates from the recommended route are used. It is preferable to return. Thereby, it can prevent that the adjustment amount becomes larger than necessary.

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

It is a block diagram which shows the structure of the navigation apparatus by one embodiment of this invention. It is a flowchart performed in order to adjust route calculation data according to a user's route selection tendency when the own vehicle deviates from a recommended route. It is the figure which showed an example of the relationship between the own vehicle position and road link before and behind deviation. It is the figure which showed an example of the intersection cost set for every advancing direction.

Explanation of symbols

1: Navigation device 10: Control unit 11: Vibration gyro 12: Vehicle speed sensor 13: HDD 14: GPS reception unit 15: Display monitor 16: Speaker 17: Input device

Claims (8)

In a navigation device that searches for a recommended route to a destination based on a predetermined evaluation criterion and guides the vehicle to the destination according to the searched recommended route.
Storage means for storing an evaluation criterion including a value of an intersection cost set based on an angle of an approach direction to the intersection of the vehicle and an advancing direction from the intersection;
Determining means for determining whether or not the vehicle deviates from the recommended route;
Adjusting means for adjusting the evaluation criteria when the determining means determines that the vehicle has deviated from the recommended route ;
The adjusting means increases the value of the intersection cost with respect to the traveling direction before the departure that should have been next unless the vehicle deviates from the recommended route, and the vehicle deviates from the recommended route. A navigation device characterized in that the evaluation criterion is adjusted by reducing the value of the intersection cost with respect to the traveling direction after the departure that has sometimes advanced . The navigation device according to claim 1, wherein
The storage means stores an evaluation criterion including a link cost set for each road link,
The adjusting means determines that the vehicle has deviated from the recommended route by the determining means, and if the vehicle has not deviated from the recommended route, the road of the road link before deviating was supposed to travel next. The navigation apparatus, wherein the evaluation criterion is adjusted when the type and the road type of the road link after the departure traveled when the vehicle deviates from the recommended route. The navigation device according to claim 2, wherein
The storage means stores an evaluation standard including, as the link cost, a weighting coefficient set according to a road type ranked in advance according to a predetermined standard,
If the road link after the departure has a higher rank of the road type than the road link before the departure, the adjustment unit may change the road type to have a higher rank than the predetermined first road type. And by adjusting the evaluation criteria by reducing the weighting factor,
When the post-departure road link has a lower road type rank than the pre-departure road link, the adjusting means applies the weighting coefficient to the road type having a lower rank than the predetermined second road type. The navigation apparatus is characterized in that the evaluation criterion is adjusted by reducing the size . The navigation device according to claim 2, wherein
The storage means stores an evaluation standard including, as the link cost, a weighting coefficient set according to a road type ranked in advance according to a predetermined standard,
In the case where the road type after the departure has a higher rank of the road type than the road link before the departure , the adjustment unit is the road type having the same or higher rank as the road link after the departure. Adjusting the evaluation criteria by reducing the weighting factor for
When the road type after the departure has a lower rank of the road type than the road link before the departure, the adjusting means weights the road type with the same or lower rank as the road link after the departure. A navigation device characterized in that the evaluation criterion is adjusted by reducing a coefficient. In the navigation device according to any one of claims 1 to 4,
A user specifying means for specifying a user;
The adjusting means adjusts the evaluation criteria for each user specified by the user specifying means,
The said storage means memorize | stores the evaluation criteria adjusted for every said user corresponding to a user, The navigation apparatus characterized by the above-mentioned. The navigation device according to any one of claims 1 to 5 ,
The navigation device according to claim 1, wherein the adjustment unit changes an adjustment amount of the evaluation criterion according to the number of times the vehicle deviates from the recommended route . The navigation device according to claim 6 , wherein
The navigation device according to claim 1, wherein the adjustment unit returns the adjustment amount of the evaluation reference to the original when the power of the navigation device is disconnected for a predetermined time or more . In the navigation device according to any one of claims 1 to 7,
The navigation apparatus further comprising a prohibiting unit that prohibits the adjustment unit from adjusting the evaluation standard at a location within a predetermined distance from a preset home .

Images