JP2012078242A - Travelable distance display apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a travelable distance display apparatus capable of simply and quickly determining the propriety of use of a toll road and the necessity of power feeding by always displaying information capable of intuitively grasping reachable power feedable points corresponding to battery residual capacity without requiring complicated operation.SOLUTION: When an own-vehicle position is located on a local road, a graph Gindicating a travelable distance when using only local roads and a graph Gindicating a travelable distance when using toll roads are displayed, icons Iindicating power feedable points on the local roads are displayed on corresponding positions on the graph Gindicating the travelable distance when using only local roads, and icons Iindicating power feedable points on the toll road are displayed on corresponding positions in the graph Gindicating a travelable distance when using toll roads.

Description

  The present invention relates to a travelable distance display device, and more particularly to a travelable distance display device suitable for displaying a travelable distance according to a remaining battery capacity of an own vehicle in an electric vehicle.

  Conventionally, an electric vehicle driven by a motor using electricity as a power source is less energy efficient when traveling on a highway than a gasoline vehicle, and the difference in travelable distance between traveling on a general road and traveling on a highway Was known to be prominent.

  In other words, electric vehicles have a relatively good power consumption because they can secure energy recovery by regenerative braking on urban roads where acceleration and deceleration are frequently required, but on highways, regenerative braking is required. Since there are very few opportunities to use the motor and it is necessary for the motor that is originally good at low speed rotation to maintain medium and high speed rotation, the power consumption is significantly deteriorated compared to driving on a general road.

  On the other hand, it is known that gasoline vehicles have better fuel efficiency when traveling on highways than when traveling on ordinary roads.

  Therefore, when an electric vehicle travels on a highway, there is a demand for notifying the user in advance whether the vehicle can reach a place where energy can be supplied without running out of energy. It can be said that it is higher than

  As conventional techniques corresponding to such a request, there have been techniques shown in Patent Documents 1 to 5, for example.

  That is, in Patent Literature 1, after searching for a route to the destination, there is no energy supply facility that can be reached according to the remaining amount of energy on the automobile road included in the searched route. A technique for notifying the necessity of energy replenishment at the nearest energy replenishment facility before entering the automobile exclusive road is disclosed.

  Patent Document 2 discloses a fuel supply facility on an expressway that can be reached according to the current remaining fuel amount by narrow-area communication between an in-vehicle terminal and a roadside device installed at an entrance gate of an ETC. In the case where it is confirmed that the vehicle does not exist, a technique for issuing an alarm prohibiting entry to the main road on the highway on the in-vehicle terminal side is disclosed.

  Furthermore, in Patent Document 3, a travelable range indicating a travelable distance corresponding to the remaining battery capacity is displayed on a road map, and a power station in the travelable range is displayed on the road map. Is disclosed.

  Furthermore, in Patent Document 4, the electric energy supply stands around the position of the vehicle are displayed in a color-coded manner on the map. For example, a stand that can be reached without any problem due to the remaining battery capacity is a blue mark, and there is some anxiety about driving. A technique is disclosed in which a stand is displayed with a red mark.

  Patent Document 5 discloses a technique for displaying a travelable range corresponding to the remaining amount of energy and an energy supply point within the travelable range on a map.

JP 2000-46572 A JP-A-2005-37266 Japanese Patent Laid-Open No. 7-85397 Japanese Patent Laid-Open No. 9-210702 JP 2003-21522 A

  However, in the technique of Patent Document 1, it is not possible to know that there is no energy supply facility that can be reached on the road for exclusive use of the automobile unless the destination is set. There is a possibility that a user traveling on a dedicated road cannot be saved from being unable to travel due to running out of battery.

  In addition, in the technique of Patent Document 2, since there is no fuel supply facility that can be reached on the highway without passing through the entrance gate of the highway, there is no fuel supply facility that can be reached. There is a problem of slow alarm timing, such as having already passed the entrance gate.

  Furthermore, in the techniques of Patent Documents 3 to 5, the travelable distance (range) and the power feedable point are displayed on a map, so that information desired by the user can be easily obtained depending on the vehicle position and the scale of the map. A case where it is not possible is assumed. For example, in the case of a map of a narrow area (large scale), since the number of power supplyable points displayed is too small, it is necessary to determine how many power supplyable points exist in the undisplayed area in the travelable range. However, there is a problem that a complicated scale changing operation is required to solve this problem.

  Therefore, the present invention has been made in view of such problems, and always displays information that can intuitively grasp a reachable power supply point according to the remaining battery capacity without requiring a complicated operation. The present invention provides a travelable distance display device that can easily and quickly determine whether toll roads can be used and whether power supply is necessary, and in turn, avoid the inability to travel due to lack of electricity. It is intended.

  In order to achieve the above-described object, a travelable distance display device according to the present invention is a travelable distance display device that displays a travelable distance of the host vehicle according to a remaining battery capacity of the host vehicle on a display unit, Map information storing means storing map information, own vehicle position detecting means for detecting the own vehicle position, remaining battery capacity acquiring means for acquiring the remaining battery capacity, and the detected vehicle position by the own vehicle position detecting means. Traveling when the vehicle travels only on a general road from the detected vehicle position based on the remaining battery capacity acquired by the remaining battery capacity acquisition means when the own vehicle position is on a general road A travelable distance calculation means for calculating a travelable distance when using a general road, which is a possible distance, and the stored map information when the detected vehicle position is on a general road Based on the toll road entrance search means for searching for the entrance of the nearest toll road to the detected vehicle position, and the acquired battery remaining capacity after the entrance is detected by the toll road entrance search means The vehicle travels when the vehicle travels on the toll road from the detected entrance after traveling on a general road from the detected vehicle position to the entrance detected by the toll road entrance search means. Based on the stored map information, the distance from the detected vehicle position is calculated based on the stored map information, and the distance from the detected vehicle position is calculated based on the stored map information. A road on which power can be fed on a general road that searches for a power feedable point on a general road that is within the travelable distance on limited use on the general road calculated by the travelable distance calculation means during use Based on the stored map information, the distance from the detected vehicle position is within the travelable distance when using the toll road calculated by the travelable distance calculation means when using the toll road A searchable point on the toll road that can be fed on the toll road, a graph showing the calculated travel distance when the road is limited to the general road, and the travel on the toll road calculated A travelable distance display means for simultaneously displaying a graph indicating a distance on the display unit, and the detected own vehicle on the graph indicating the travelable distance during limited road use displayed by the travelable distance display means The detection is performed at a position corresponding to the distance from the position to the power supply possible point on the general road detected by the general road power supply possible point searching means. The on-road power supplyable point icon display means for displaying an icon indicating the power supply possible point on the issued general road, and the detection on the graph showing the travelable distance when using the toll road displayed by the travelable distance display means An icon indicating the detected power supply point on the toll road at a position corresponding to the distance from the determined vehicle position to the power supply possible point on the toll road detected by the toll road power supplyable point search means And a point icon display means on the toll road where power can be supplied.

  Then, according to such a configuration, when the vehicle position is on a general road, a graph indicating the travelable distance when using the general road and a graph indicating the travelable distance when using the toll road are simultaneously displayed on the display unit. In addition to displaying the icon indicating the power supply possible point on the general road, the icon on the toll road on the road indicating the distance from the vehicle position to the power supply possible point on the general road on the graph indicating the travelable distance when using the general road only Depending on the remaining battery capacity, an icon indicating the power supply point is displayed at a position corresponding to the distance from the own vehicle position to the power supply possible point on the toll road on the graph indicating the travelable distance when using the toll road. It is possible to intuitively grasp the reachable power supply points. As a result, it is possible to quickly and appropriately determine whether or not toll roads can be used from the entrance of the nearest toll road and whether or not power supply is required before entering the toll road on ordinary roads without requiring complicated operations. As a result, the inability to travel due to lack of electricity on the toll road can be avoided in advance.

  Further, the power supply possible point icon display means on the general road may display an icon indicating the detected power supply possible point on the general road whose distance from the detected vehicle position is within a predetermined distance.

  According to such a configuration, as the distance from the vehicle position increases, the probability that a large number of power feedable points are detected on the general road increases. It is possible to maintain the visibility of the graph by displaying the icons of the power supply points in a limited manner.

  Further, the travelable distance calculation means when using the general road recalculates the travelable distance when using the general road only every predetermined cycle, and the travelable distance calculation means when using the toll road is used every predetermined cycle. Recalculation of the travelable distance when using the toll road, and the travelable distance display means is a graph showing the travelable distance when using the limited road according to the recalculation of the travelable distance when using the limited road The display distance can be changed, and the display distance of the graph indicating the travelable distance when using the toll road can be changed according to the recalculation of the travelable distance when using the toll road. The point icon display means is capable of changing the number of icons indicating the detected power supply possible points on the general road according to the recalculation of the travelable distance when using the general road only. The toll road power supply possible point icon display means is capable of changing the number of icons indicating the detected power supply points on the toll road according to the recalculation of the travelable distance when using the toll road. May be.

  And according to such a structure, the change of the display distance of the graph which each shows the driving | running | working distance at the time of use of a general road limitation, and the driving | running | working distance at the time of use of a toll road corresponding to the change of battery remaining capacity flexibly It is possible to change the number of icons indicating the points that can be fed on general roads or toll roads displayed on the road, so it is possible to accurately determine whether toll roads can be used and whether power supply is necessary on real roads in real time. Judgment can be made.

  Furthermore, the subject vehicle is detected based on the result of recalculation of the travelable distance when using the toll road and the position of the feedable point on the detected toll road that is closest to the detected entrance. When the vehicle enters the toll road from the entrance, it is provided with a toll-feedable point reach difficulty determining means for determining whether it is difficult to reach the nearest feedable point on the toll road, and the travelable distance display means is When a positive determination result is obtained by the power supply reachable point arrival difficulty determination means on the toll road, the display color of the graph indicating the travelable distance when using the toll road is different from a predetermined normal display color You may display with a display color.

  According to such a configuration, it is possible to grasp at a glance that it has become difficult to reach the power supply possible point on the toll road due to the change in the remaining battery capacity. It is possible to take measures such as supplying power before entering.

  In addition, when a positive determination result is obtained by the power supply possible point arrival difficulty determination unit on the toll road, a warning unit may be provided that outputs a warning so as not to enter the toll road.

  And according to such a structure, when it becomes difficult to reach the power supply possible point on the toll road due to the change in the remaining battery capacity, a warning is output to the expressway in a state where the battery capacity is insufficient. The approach can be avoided beforehand.

  Further, when the detected vehicle position is on a toll road, the travelable distance calculation means when using the toll road uses the detected battery position based on the acquired remaining battery capacity. When the vehicle travels only on a toll road, it calculates a tollable distance when using the toll road only, which is a distance that can be traveled, and the tollable point search means on the toll road is based on the stored map information The distance from the detected vehicle position within the travelable distance when using the toll road is calculated as the travelable distance calculation means when the toll road is used as the power supply possible point on the toll road. 2 to search for a power supply possible point on the toll road, and the travelable distance display means displays a graph showing the calculated travelable distance at the limited use of the toll road on the display unit, The toll road power supply possible point icon display means is capable of supplying power on the toll road from the detected own vehicle position on the graph indicating the travelable distance during limited use of the toll road displayed by the travelable distance display means. An icon indicating the detected feedable point on the second toll road may be displayed at a position corresponding to the distance to the feedable point on the second toll road detected by the point search means. .

  According to such a configuration, even when the position of the vehicle is on a toll road, a graph showing the travelable distance when using the toll road only is displayed on the display unit, and power feeding on the second toll road is also performed. By displaying an icon indicating a possible point on the graph at a position corresponding to the distance from the vehicle position to the power supplyable point on the second toll road, the power supplyable point that can be reached according to the remaining battery capacity is displayed. It can be grasped intuitively. As a result, it is possible to quickly and appropriately determine whether or not the toll road can be continuously used on the toll road and whether or not to supply power after exiting the toll road without requiring a complicated operation.

  Furthermore, the travelable distance calculation means when using the toll road recalculates the travelable distance when using the toll road only every predetermined cycle, and the travelable distance display means can run when using the toll road only The display distance of the graph showing the travelable distance when using the toll road only in accordance with the recalculation of the distance can be changed, and the point icon display means on the toll road can be fed with the travel distance when using the toll road only It may be possible to change the number of displayed icons indicating the power supply possible points on the second toll road according to recalculation.

  And according to such a structure, the change of the display distance of the graph which shows the tollable distance at the time of limited use of a toll road, and the on the toll road displayed on the said graph flexibly respond | correspond to the change of remaining battery capacity. Since it is possible to change the display number of icons indicating points where power can be supplied, it is possible to accurately determine in real time whether or not the toll road can be used and whether power supply is necessary on the toll road.

  Further, when the detected vehicle position is on a toll road, a toll road exit search for searching for the exit of the toll road nearest to the detected vehicle position based on the stored map information And when the detected vehicle position is on a toll road, the travel distance calculation means when using the general road is based on the exit detected by the toll road exit search means. When the vehicle travels only on a general road after exiting the toll road, it calculates a travel distance on the general road when exiting the toll road, which is the distance from the detected exit that can be traveled, Based on the stored map information, the distance from the detected exit as the power supply possible point on the general road is calculated by the travel distance calculation means when using the general road. A graph showing the power supply possible point on the second general road within the ordinary road travelable distance when exiting the toll road, and the travelable distance display means is a graph showing the calculated general road travel distance when exiting the toll road Is displayed on the display unit, and the point icon display means for supplying power on the general road is based on the detected exit on the graph indicating the general road travel distance when exiting the toll road displayed by the travel distance display means. An icon indicating the detected power supply possible point on the second general road is displayed at a position corresponding to the distance to the power supply possible point on the second general road detected by the general road power supply possible point searching means. May be.

  And according to such a structure, when the own vehicle position is on a toll road, while displaying the graph which shows the driving distance on a general road at the time of exiting a toll road on a display part, power supply on a 2nd general road is possible By displaying the icon indicating the point at a position corresponding to the distance from the nearest toll road exit to the power supply point on the second general road on the graph, for example, the toll road from the nearest toll road exit It is easy to know that if you escape, you can escape the electric shortage.

  Further, the travelable distance calculation means when using the general road recalculates the travel distance of the general road when exiting the toll road every predetermined cycle, and the travelable distance display means is the travel of the general road when exiting the toll road. According to the recalculation of the possible distance, the display distance of the graph indicating the travel distance on the general road when exiting the toll road can be changed, and the point icon display means on the general road can be traveled on the general road when exiting the toll road It may be possible to change the number of displayed icons indicating the power supply possible points on the second general road according to the recalculation of the distance.

  And according to such a structure, the change of the display distance of the graph which shows the general road driving | running | working distance at the time of exiting a toll road, and the 2nd displayed on the said graph respond | correspond flexibly to the change of remaining battery capacity. Since it is possible to change the number of icons indicating points that can be supplied on ordinary roads, whether to use the toll road continuously on the toll road and whether to supply power after exiting the toll road Can be accurately determined in real time.

  Furthermore, when the detected vehicle position is on a toll road, it corresponds to the detected exit on the graph showing the travelable distance when the toll road is limited use displayed by the travelable distance display means. A toll road exit display means for displaying a mark indicating the exit may be provided at the position to be displayed.

  And according to such a structure, since the distance to the exit of the nearest toll road can be grasped | ascertained beforehand, it becomes easy to take the correspondence which escapes a toll road from the said exit.

  In addition, when the detected vehicle position is on a toll road, the travelable distance display means displays only a graph indicating the calculated travelable distance during limited use on the toll road on the display unit. May be.

  According to such a configuration, when the vehicle position is on a toll road, a simple display can be achieved by not displaying the travelable distance on the road side and the icon display of the power supply point at all. It can be carried out.

  Further, the graph is a pie chart in which the calculation result of the travelable distance calculation means when using the general road and the calculation result of the travelable distance calculation means when using the toll road have concentric arcs facing each other. It may be.

  According to such a configuration, the travelable distance can be displayed in a display mode suitable for reflecting the remaining battery capacity, such as a fuel gauge, so that it is possible to travel according to the remaining battery capacity. The distance can be grasped more intuitively.

  Furthermore, the graph indicating the travelable distance may be displayed in a meter panel of the own vehicle or on a display unit of a navigation device.

  And according to such a structure, the display of the driving distance which utilized the existing installation can be performed.

  The graph indicating the travelable distance is displayed on a display unit of a navigation device, the icon indicating the power supply point is displayed so as to be selectable on the graph, and the navigation device is displayed on the selected icon. You may perform route guidance to the applicable power supply point.

  And according to such a structure, since the route guidance to the power supply possible point corresponding to the selected icon can be performed, the convenience can be further improved.

  According to the present invention, it is possible to use a toll road and to supply power by constantly displaying information that can intuitively grasp a reachable power supply point according to the remaining battery capacity without requiring a complicated operation. Whether it is necessary or not can be determined easily and quickly, and consequently it is possible to avoid the inability to travel due to lack of electricity.

The block diagram which shows embodiment of the driving distance display apparatus which concerns on this invention The schematic diagram which shows the 1st example of a display of travelable distance in embodiment of the travelable distance display apparatus which concerns on this invention. The schematic diagram which shows the 2nd example of a display of travelable distance in embodiment of the travelable distance display apparatus which concerns on this invention. The schematic diagram which shows the 3rd example of a display of travelable distance in embodiment of the travelable distance display apparatus which concerns on this invention. The schematic diagram which shows the 4th example of a travelable distance display in embodiment of the travelable distance display apparatus which concerns on this invention. The schematic diagram which shows the specific example of the display position of travelable distance in embodiment of the travelable distance display apparatus which concerns on this invention. The flowchart which shows embodiment of the travelable distance display apparatus which concerns on this invention.

  Hereinafter, an embodiment of a travelable distance display device according to the present invention will be described with reference to FIGS. 1 to 7.

  The travelable distance display device according to the present embodiment is mounted on the own vehicle, which is an electric vehicle, and can display the travelable distance of the vehicle according to the remaining capacity of the battery (secondary battery) of the vehicle on the display unit. It is said that.

  Specifically, as shown in FIG. 1, the travelable distance display device 1 according to the present embodiment includes a map information storage unit 2 in which map information is stored as map information storage means. The map information storage unit 2 may be a hard disk drive, for example.

  Here, the map information is composed of various physical data frames such as a road data frame, a background data frame, a name data frame, a route guidance data frame, a route calculation data frame, and a point information frame.

  Of these, the road data frame can be used for display of a road map, and the road data frame includes, for example, two-dimensional coordinates of a node indicating a link end or a shape change point on the link, Node / link connection information indicating connection relations with other links, node additional information (link ID, width / lane information, road name, etc.), altitude information, traffic regulation information, and the like are stored.

  In addition, the background data frame can be used for display of a background map and the like, and for example, a display class (building, park, river) for expressing a figure (line or surface) is included in this background data frame. Element point coordinate information (start point coordinates, offset coordinates) collected for each of the above.

  Furthermore, the name data frame can be used for display of a character string on a map, and the name data record grouped for each display class is stored in the name data frame, for example. .

  Furthermore, the route calculation data frame can be used to calculate the optimum route to the destination in navigation. For example, node data, link records, restriction records, and links between links are included in this route calculation data frame. Stored are a cost record, a link ID, the cost of the link itself, information for specifying a higher node and link, node coordinates, and the like.

  In addition, the route guidance data frame can be used for route guidance. The route guidance data frame includes, for example, guidance data including intersection names, road names, and direction names, and entities related to the guidance data. Display characters, phonetic characters, accent information, a shape for drawing an entity related to guidance data, actual data for drawing an image according to the approach direction of the intersection for guidance, and the like.

  Furthermore, the point information frame can be used for searching for a candidate for a destination or waypoint, for displaying a POI icon superimposed on a map, and the point information frame includes, for example, POI attributes, such as POI data (POI information) indicating position (longitude and latitude), type, name, address, telephone number and POI icon, and attribute information (position information, address information, etc.) of each point other than POI And are stored. Here, in the present embodiment, the POI includes a power supply possible point, which is a point where power can be supplied (charged) to the battery of the own vehicle, and a toll road entrance / exit (interchange). As a power supply possible point, for example, a facility such as a charging stand can be cited.

  Of course, such map information may be stored in the map database of the navigation device.

  As shown in FIG. 1, the travelable distance display device 1 includes a host vehicle position detection unit 3 as a host vehicle position detection unit, and the host vehicle position detection unit 3 detects the host vehicle position. It is supposed to be. The own vehicle position detection unit 3 may detect the own vehicle position using information received by a GPS receiver (not shown) or detection information of an autonomous navigation sensor such as a gyro sensor or a vehicle speed sensor. Here, the GPS receiver is capable of receiving GPS information (information on time and orbit) distributed from GPS satellites, and the vehicle position detection unit 3 is based on the GPS information. The position of the vehicle can be detected by performing satellite navigation that positions the position as absolute coordinates. The autonomous navigation sensor is capable of detecting the acceleration, the vehicle speed, the vehicle direction, and the like of the own vehicle. The own vehicle position detection unit 3 is based on the detection result of the autonomous navigation sensor. The host vehicle position can also be detected by performing autonomous navigation in which the position is measured as a relative position that is a change from the previous positioning position. Furthermore, the own vehicle position detection unit 3 uses the map information stored in the map information storage unit 2 to change the own vehicle position detected by satellite navigation or autonomous navigation to the corresponding position on the road in the map information. By performing the map matching process to be corrected, the vehicle position can be detected with higher accuracy.

  Further, as shown in FIG. 1, the travelable distance display device 1 includes a battery remaining capacity acquisition unit 4 as a battery remaining capacity acquisition unit. The battery remaining capacity acquisition unit 4 includes a battery remaining capacity acquisition unit 4. The capacity is acquired continuously. For example, a known battery remaining amount measuring IC technology of a sense resistance method or a sense resistance less method can be applied to the remaining battery capacity acquisition unit 4.

  Furthermore, as shown in FIG. 1, the travelable distance display device 1 includes a travelable distance calculation unit 5 when using a general road as a travelable distance calculation means when using a general road. When the vehicle position detected by the vehicle position detection unit 3 is on a general road, the travelable distance calculation unit 5 when using a general road calculates a travelable distance when using the general road. Yes. Here, the travelable distance during limited road use is a travelable distance when the vehicle travels only on a general road from the vehicle position on the general road detected by the vehicle position detection unit 3 (hereinafter, referred to as a travel distance). The same). This travelable distance during limited road use can be calculated based on the remaining battery capacity acquired by the remaining battery capacity acquisition unit 4 and the known power consumption on the general road of the host vehicle. The power consumption on the general road may be fixed from the beginning of manufacture, or may be calculated by learning based on the travel history of the user on the general road.

  As shown in FIG. 1, the travelable distance display device 1 includes a toll road entrance search unit 6 as a toll road entrance search means. The toll road entrance search unit 6 detects the vehicle position based on the map information stored in the map information storage unit 2 when the vehicle position detected by the vehicle position detection unit 3 is on a general road. The entrance of the nearest toll road (hereinafter referred to as the nearest entrance) is searched for the own vehicle position detected by the section 3. When searching for the nearest entrance, it is only necessary to search for the entrance of a toll road that minimizes the cost from the vehicle position using a route calculation method such as the Dijkstra method. The toll road may be a highway.

  Further, as shown in FIG. 1, the travelable distance display device 1 has a tollable road travelable distance calculation unit 7 as a tollable road travelable distance calculation means. The tollable road travelable distance calculation unit 7 calculates the travelable distance when toll road use is made after the closest entrance is detected by the toll road entrance search unit 6. Here, the travelable distance when the toll road is used means that the own vehicle travels on the ordinary road from the own vehicle position detected on the ordinary road to the nearest entrance detected by the toll road entrance search unit 6. This is the distance from the vehicle position where the vehicle can travel when traveling on the toll road from the nearest entrance (the same applies hereinafter). The travelable distance when using the toll road includes the remaining battery capacity acquired by the remaining battery capacity acquisition unit 4 and the detected distance from the vehicle position on the general road to the nearest entrance (the path with the lowest cost). It can be calculated on the basis of the electricity costs on the general road of the own vehicle and on the toll road. The electricity cost on the toll road may be fixed from the beginning of manufacture, or may be calculated by learning based on the travel history of the user toll road.

  Furthermore, as shown in FIG. 1, the travelable distance display device 1 includes a general road feedable point search unit 8 as a general road feedable point search unit. The general road power supplyable point search unit 8 searches for a first general road power supplyable point based on the map information stored in the map information storage unit 2. Here, the first general road power supply possible point is calculated by the travelable distance calculation unit 5 when using a general road from the vehicle position on the general road detected by the vehicle position detection unit 3. It is a point where power can be supplied on a general road (in other words, along a general road) that is within a travelable distance when using the general road only (the same applies hereinafter).

  As shown in FIG. 1, the travelable distance display device 1 includes a toll road power feedable point search unit 9 as a toll road power feedable point search means. The toll-powerable point search unit 9 searches for a first toll-powerable point based on the map information stored in the map information storage unit 2. Here, the first tollable point on the toll road is calculated by the travelable distance calculation unit 7 when the toll road is used as the road distance from the own vehicle position on the general road detected by the own vehicle position detection unit 3. This is a point where power can be supplied on the toll road (in other words, along the toll road) that is within the allowable travel distance when the toll road is used (the same applies hereinafter).

  Furthermore, as shown in FIG. 1, the travelable distance display device 1 has a travelable distance drawing unit 10 as a travelable distance display means. The travelable distance drawing unit 10 is a graph showing the travelable distance when using a general road, which is calculated by the travelable distance calculation unit 5 when using a general road, and the travelable distance calculating unit 7 when using a toll road. A graph indicating the travelable distance when using the toll road is displayed on the display unit 20 at the same time.

  Furthermore, as shown in FIG. 1, the travelable distance display device 1 has a general road power feedable point icon drawing unit 11 as a general road power feedable point icon display means. The point icon drawing unit 11 on the road for supplying power on the general road includes the vehicle on the road detected by the vehicle position detection unit 3 on the graph indicating the travelable distance when the general road is limited and displayed on the travelable distance drawing unit 10. An icon indicating the detected first general road power supply possible point at a position corresponding to the distance from the position to the first general road power supply possible point detected by the general road power supply possible point search unit 8 It is supposed to be displayed.

  As shown in FIG. 1, the travelable distance display device 1 includes a toll road power feedable point icon drawing unit 12 as a toll road power feedable point icon display means. This toll road power supply possible point icon drawing unit 12 is the own vehicle on the general road detected by the own vehicle position detection unit 3 on the graph showing the travelable distance when using the toll road displayed by the travelable distance drawing unit 10. The detected first toll road feedable point is located at a position corresponding to the distance from the position to the first toll road feedable point detected by the toll road feedable point search unit 9. The icon to show is displayed.

  Here, FIG. 2 shows a travelable distance drawing unit 10, a general road power supplyable point icon drawing unit 11, and a toll road when the vehicle position detected by the vehicle position detection unit 3 is on a general road as described above. The example of a display by the upper power supply possible point icon drawing part 12 is shown.

In FIG. 2, a graph G ₁ indicating a travelable distance when using a general road and a graph G ₂ indicating a travelable distance when using a toll road are displayed as pie charts having concentric circular arcs facing each other. Yes. In FIG. 2, the travelable distance when using a general road is 200 km, and the travelable distance when using a toll road is 100 km. In addition, as shown in FIG. 2, there is a position corresponding to each point of 20 km, 40 km, and 70 km from the own vehicle position on the general road on the general road on the graph G ₁ showing the travelable distance when the general road is limited use. The icons I ₁ indicating the first general road power supply possible points are displayed. Furthermore, as shown in FIG. 2, first to a position corresponding the vehicle position on the general road on the graph G ₂ showing the toll road use during traveling distance to each point of 30km and 60km is present in each point icon I ₂ indicating the toll road on the feedable points are displayed respectively. A mark indicating the nearest entrance may be displayed at a position corresponding to the corresponding distance on the graphs G ₁ and G ₂ .

  And by such a structure, the user can grasp | ascertain intuitively the power supply possible point on the general road and toll road which can be reached according to battery remaining capacity. Therefore, it is possible to use the toll road from the entrance of the nearest toll road on the general road and before entering the toll road without requiring complicated operations such as setting the destination and changing the scale of the map as before. It is possible to quickly and appropriately determine whether or not power supply is required.

  The general road power feedable point icon drawing unit 11 is an icon indicating a first general road power feedable point whose distance from the vehicle position on the general road detected by the vehicle position detection unit 3 is within a predetermined distance. Only limited display may be performed. In this case, the general road power feedable point search unit 8 may search for only the first general road power feedable point existing within such a predetermined distance in advance. If comprised in this way, it can avoid that the visibility of a graph is impaired by the enormous number of icons displayed.

  In addition to the above-described configuration, in the present embodiment, the available road travelable distance calculation unit 5 has a predetermined cycle on the assumption that the vehicle position detected by the vehicle position detection unit 3 is on the general road. Recalculation of the distance that can be traveled when using only on general roads is performed. In this case, the predetermined period may be a time period (for example, every minute) or a distance period (for example, every 1 km) accompanying the movement of the host vehicle. Further, the travelable distance calculation unit 7 when using the toll road uses the precondition that the own vehicle position detected by the host vehicle position detection unit 3 is on a general road, Calculations are to be performed. The recalculation of the travelable distance when using the toll road may be performed in synchronization with the recalculation of the travelable distance when using the general road only. Further, the recalculation of the travelable distance when using the toll road may be performed on the premise that the toll road entrance retrieval unit 6 re-searches for the nearest entrance. Furthermore, the travelable distance drawing unit 10 indicates that when the recalculated travel distance for general road limited use shows a predetermined change (for example, a change of a predetermined distance or more) with respect to the value immediately before the recalculation, In response to this, the display distance of the graph indicating the travelable distance during limited road use is changed to a display distance corresponding to the travelable distance during limited road use after the recalculation. It should be noted that the change in the travelable distance during limited road use includes a reduction due to a decrease in the remaining battery capacity, and an increase due to an increase in the remaining battery capacity due to power supply in the middle. The same applies to the change in the travelable distance other than the travelable distance when using the general road only. Furthermore, if the travelable distance when using the toll road after recalculation shows a predetermined change (increase / decrease) with respect to the value immediately before recalculation, the travelable distance drawing unit 10 pays accordingly. The display distance of the graph indicating the travelable distance when using the road is changed to a display distance corresponding to the travelable distance when using the toll road after the recalculation. Further, the general road power supplyable point icon drawing unit 11 has changed (increased / decreased) the number of first general road power supplyable points with respect to the number just before the recalculation due to the recalculation of the travelable distance when using the general road only. In this case, the display number of the icon indicating the first general road power supply possible point is changed with respect to the display number immediately before the recalculation. Here, the increase in the number of first general road power supply possible points can be grasped by re-searching the first general road power supply possible points by the general road power supply possible point search unit 8. This first search for the point on the first general road that can be fed may be triggered by the detection of the extension change of the travelable distance when the general road is limited. In addition, the re-search of the first general road power supply possible point is the search for only the area corresponding to the extended travel distance when the general road is limited, that is, the first general road power supply can be increased. The search may be limited to points. On the other hand, regarding the decrease in the number of first power supply possible points, the position of the first general road power supply points that have already been detected and the general calculation by recalculation can be performed without re-searching the power supply possible points. This can be grasped from the shortened change of the travelable distance when using the road only. Note that the change in the display number of the icon indicating the first general road power supply possible point may be accompanied by a change in the display position of the icon on the graph. Furthermore, when the toll road power supply possible point icon drawing unit 12 recalculates the travelable distance when using the toll road, the number of first power supply possible points on the toll road changes from the number immediately before the recalculation. Accordingly, the display number of the icon indicating the first tollable point on the toll road is changed with respect to the display number immediately before the recalculation. Here, as for the change in the number of points that can be fed on the first toll road, as in the case of the first point on which power can be fed on the general road, a re-search by the toll road feedable point search unit 9 or the already existing first Can be grasped on the basis of the search result of the points on the toll road where power can be supplied. However, when the above-described change of the nearest entrance is detected, it is desirable to always search again for the first tollable point on the toll road. Further, the change in the number of icons displayed indicating the first tollable power supply point may be accompanied by a change in the display position of the icon on the graph.

  With such a configuration, it is possible to accurately determine in real time whether or not the toll road can be used and whether or not power supply is necessary on a general road in response to a change in the remaining battery capacity.

In addition to the above configuration, in the present embodiment, as shown in FIG. 1, the travelable distance display device 1 includes a toll road power supplyable point reach difficulty determination unit as a toll road power feedable point reachability determination unit. 13. The toll road power supply reachable point reach difficulty determining unit 13 recalculates the travelable distance when using the toll road and the first toll road power supply closest to the nearest entrance detected by the toll road entrance search unit 6. Based on the position of the possible point, it is determined whether it is difficult to reach the power supply point on the first toll road closest to the nearest entrance when the vehicle enters the toll road from the nearest entrance (hereinafter, This is referred to as reachability determination. Further, when a positive determination result is obtained by the reach difficulty determination, the travelable distance drawing unit 10 displays a graph that indicates the travelable distance when using the toll road is different from a predetermined normal display color. The display color is displayed. Here, FIG. 3 shows a display example of the travelable distance drawing unit 10 in such a case. FIG. 3 shows graphs G ₁ and G ₂ and an icon I _{1 at the} position of the vehicle on the general road after the vehicle continues to travel without power feeding from the position of the vehicle when the display of FIG. 2 is performed. , I ₂ is shown. In FIG. 3, the travelable distance when using the toll road (that is, the display distance) is greatly shortened from 100 km to 30 km in the case of FIG. 2, and is closest to the nearest entrance (closest to the vehicle position). The first power supply possible point on the toll road exists at a position near 30 km from the own vehicle position. In the example of FIG. 3, the first toll-powerable point on the toll road located at the upper limit of the maximum travelable distance when using the toll road as shown in FIG. are determined that the vehicle is difficult arrival, receives the determination result, the display color of the graph G ₂ showing the travelable distance at toll road users is changed from the normal display color in the case of FIG. 2 Yes. For example, when the display color of the graphs G ₁ and G ₂ in FIG. 2 is blue, the display color of the graph G ₂ in FIG. 3 may be red.

  With such a configuration, the user can grasp at a glance that it has become difficult to reach the first chargeable point on the toll road due to a change in the remaining battery capacity. It is possible to promptly take measures such as supplying power before entering the road.

  In addition to the above configuration, in the present embodiment, the travelable distance display device 1 includes a warning output unit 14 as a warning unit, as shown in FIG. The warning output unit 14 is configured to output a warning so as not to enter the toll road when a positive determination result is obtained by the toll road power supply reachable point difficulty determining unit 13. This warning may be displayed on the display unit 20 or may be output as audio via the audio output unit 21. Further, at this time, power supply at the nearest first general road power supply possible point may be promoted.

  With such a configuration, when it becomes difficult to reach the first tollable power supply point due to a change in the remaining battery capacity, a warning is output to the expressway with insufficient battery capacity. Can be avoided in advance.

  In addition to the above configuration, in the present embodiment, the travelable distance display device 1 further determines that the vehicle position is on a general road when the vehicle position detected by the vehicle position detection unit 3 is on a toll road. The processing is different from that in the case. That is, when the toll road useable travel distance calculation unit 7 is on the toll road when the own vehicle position detected by the own vehicle position detection unit 3 is, instead of the above-described toll road useable travel distance, The distance that can be traveled when using toll roads is calculated. Here, the travelable distance when using the toll road only is a travelable distance when the vehicle travels only on the toll road from the own vehicle position on the toll road detected by the own vehicle position detection unit 3 ( The same applies hereinafter). The travelable distance when using the toll road only is based on the remaining battery capacity acquired by the remaining battery capacity acquisition unit 4 and the electricity cost on the known toll road of the own vehicle, similarly to the travelable distance when using the toll road. Can be calculated. Also, the toll road power supply possible point search unit 9 uses the second toll road power supply instead of the above-described first toll road power supply point based on the map information stored in the map information storage unit 2. Search for possible points. Here, the second tollable point on the toll road is calculated by the travelable distance calculation unit 7 when the toll road is used as the distance from the own vehicle position on the toll road detected by the own vehicle position detection unit 3. This is a point where power can be supplied on the toll road that is within the allowed travel distance when using the toll road only (the same applies hereinafter). Further, the travelable distance drawing unit 10 indicates the travelable distance when using the toll road only, calculated by the travelable distance calculation unit 7 when using the toll road, instead of the graph indicating the travelable distance when using the toll road. A graph is displayed. Furthermore, the toll road power supply possible point icon drawing unit 12 is the toll road detected by the vehicle position detection unit 3 on the graph indicating the tollable distance when the toll road limited use is displayed displayed by the travelable distance drawing unit 10. The detected second toll road feedable point at a position corresponding to the distance from the upper vehicle position to the second toll road feedable point detected by the toll road feedable point search unit 9 The icon which shows is displayed.

  With such a configuration, even when the vehicle position is on the toll road, it is possible to intuitively grasp the power supply possible point on the toll road that can be reached according to the remaining battery capacity. Without the need for operation, it is possible to quickly and appropriately determine whether or not the toll road can be continuously used on the toll road and whether or not to supply power after exiting the toll road.

  In addition to the above-described configuration, in the present embodiment, the tollable road travelable distance calculation unit 7 recalculates the tollable road limited travelable distance every predetermined period. In addition, the travelable distance drawing unit 10 shows a predetermined change (for example, a change of a predetermined distance or more) with respect to the value immediately before the recalculation, when the travelable distance when using the toll road only after recalculation is shown. In response to this, the display distance of the graph indicating the travelable distance when using the toll road only is changed to a display distance corresponding to the travelable distance when using the toll road only after the recalculation. Furthermore, the toll road power feedable point icon drawing unit 12 re-calculates the tollable road-only travelable distance when the number of second toll road power feedable points changes from the number just before the recalculation. In response to this, the display number of the icon indicating the second tollable power supply point is changed from the display number immediately before the recalculation. As for the change in the number of second power supply possible points on the toll road, as in the case of the first general road power supply possible point described above, the re-search by the toll road power supply possible point search unit 9 or the already existing first It can be grasped based on the search result of the points on the toll road where power can be supplied. In addition, the change in the display number of the icon indicating the second chargeable point on the toll road may be accompanied by a change in the display position of the icon on the graph.

  With such a configuration, whether to use the toll road continuously and whether to supply power after exiting the toll road on the toll road can be accurately determined in real time according to the change in the remaining battery capacity. Judgment can be made.

  In addition to the above configuration, in the present embodiment, the travelable distance display device 1 includes a toll road exit search unit 15 as a toll road exit search means as shown in FIG. The toll road exit searching unit 15 detects the vehicle based on the map information stored in the map information storage unit 2 when the vehicle position detected by the vehicle position detecting unit 3 is on the toll road. It searches for the exit (hereinafter referred to as the nearest exit) of the nearest (nearest) toll road to the vehicle position. Further, when the vehicle position is on the toll road as described above, the travelable distance calculation unit 5 when using the ordinary road uses the ordinary road when exiting the toll road instead of the aforementioned travelable distance when using only the ordinary road. The distance that can be traveled is calculated. Here, the ordinary road travelable distance when exiting the toll road is the nearest distance that the vehicle can travel when traveling only on the ordinary road after exiting the toll road from the nearest exit detected by the toll road exit search unit 15 The distance from the exit (the same applies hereinafter). The available road travel distance when exiting the toll road includes the remaining battery capacity acquired by the remaining battery capacity acquisition unit 4, the distance on the toll road from the own vehicle position to the nearest exit, and the known toll road and ordinary road of the own vehicle. It can be calculated based on the electricity cost at. Furthermore, in this case, the general road power feedable point search unit 8 uses the second general road power supply point instead of the above-described first general road power feedable point based on the map information stored in the map information storage unit 2. It is designed to search for points where power can be supplied. Here, the second road on which power can be supplied is the toll road escape calculated by the road calculation distance calculating section 5 when the road is used from the nearest exit detected by the toll road exit searching section 15. This is a point where power can be supplied on a general road that is within the allowable travel distance of the general road (hereinafter the same). Furthermore, in this case, the travelable distance drawing unit 10 includes the above-described graph indicating the travelable distance when using the toll road only, and the general road when exiting the toll road calculated by the travelable distance calculation unit 5 when using the general road. A graph showing the travelable distance is displayed. Further, in this case, the general road power supply possible point icon drawing unit 11 is detected by the toll road exit searching unit 15 on the graph indicating the normal road travelable distance when exiting the toll road displayed by the travelable distance drawing unit 10. An icon indicating the detected second general road power supply possible point is displayed at a position corresponding to the distance from the nearest exit to the second general road power supply possible point detected by the general road power supply point search unit 8. It is supposed to be.

  With such a configuration, the user can easily grasp that, for example, if the user exits the toll road from the nearest exit, he / she can escape the electric shortage at the second general road power supply possible point.

  In addition to the above-described configuration, in the present embodiment, the available road travelable distance calculation unit 5 recalculates the available road travelable distance when exiting the toll road every predetermined cycle. This recalculation may be performed in synchronization with the recalculation of the travelable distance when using the toll road only. In addition, the recalculation of the distance that can be traveled on a general road when exiting the toll road may be performed on the premise that the toll road exit searching unit 15 re-searches for the nearest exit. Furthermore, the travelable distance drawing unit 10 indicates that when the recalculated general road travelable distance when exiting the toll road shows a predetermined change (for example, a change of a predetermined distance or more) with respect to the value immediately before the recalculation. Accordingly, the display distance of the graph indicating the available road travel distance when exiting the toll road is changed to the display distance corresponding to the travel distance available when exiting the toll road after the recalculation. . Furthermore, when the general road power supply possible point icon drawing unit 11 recalculates the general road travelable distance when exiting the toll road, the number of second general road power supply possible points changes from the number immediately before the recalculation. In response to this, the display number of the icon indicating the second general road power supply possible point is changed with respect to the display number immediately before the recalculation. As for the change in the number of second general road power supplyable points, as in the case of the first general road power supply possible point described above, the general road power supplyable point search unit 8 performs a re-search or an existing search result. Can be grasped based on. However, when a change in the nearest exit is detected, it is desirable to always re-search for the second general road power supply possible point. In addition, the change in the display number of the icon indicating the second power supply possible point on the general road may be accompanied by a change in the display position of the icon on the graph.

  With such a configuration, on the toll road, whether to use the toll road continuously and whether to supply power after exiting the toll road can be determined in real time in response to changes in the remaining battery capacity. It can be judged accurately.

  In addition to the above configuration, in the present embodiment, the travelable distance display device 1 has a toll road exit drawing unit 16 as toll road exit display means as shown in FIG. The toll road exit drawing unit 16 calculates the travelable distance during limited use of the toll road displayed by the travelable distance drawing unit 10 when the vehicle position detected by the vehicle position detection unit 3 is on the toll road. A mark indicating the nearest exit is displayed at a position corresponding to the nearest exit detected by the toll road exit search unit 15 on the shown graph.

  With such a configuration, since the distance to the nearest exit can be grasped in advance, it becomes easy to take a way to escape the toll road from the nearest exit.

  Here, FIG. 4 shows a travelable distance drawing unit 10, a general road power supplyable point icon drawing unit 11, and a toll when the vehicle position detected by the vehicle position detection unit 3 is on a toll road as described above. The example of a display by the on-road power supply possible point icon drawing part 12 is shown.

In FIG. 4, a graph G ₃ indicating the travelable distance when using the toll road only and a graph G ₄ indicating the travel distance of the general road when exiting the toll road are displayed as a pie chart showing concentric circular arcs facing each other. Has been. In FIG. 4, the travelable distance when using the toll road only is 60 km, and the travel distance of the general road when leaving the toll road is 180 km. Further, as shown in FIG. 4, in a position corresponding the vehicle position on the toll road on the graph G ₃ showing the toll road limited use when traveling range to a point 60km, the second present in the same location icon I ₃ showing the toll road on the feedable point is displayed. Furthermore, as shown in FIG. 4, a position corresponding from the nearest exit to the point of 20km and 40km in the graph G ₄ showing a general road traveling distance at toll road exit, the second general present in each point Icons I ₄ indicating points on the way that can be fed are displayed. Furthermore, as shown in FIG. 4, in a position corresponding the vehicle position on the toll road on the graph G ₃ showing the toll road limited use when possible running distance in the 10km point, the mark M indicating the nearest exit It is displayed.

Then, the user who sees the display of the graphs G ₃ , G ₄ , icons I ₃ , I ₄ and the mark M in FIG. 4 reaches the nearest second power supply possible point on the toll road without power shortage. Although it is difficult to do, it can be easily grasped that if you exit the toll road from the nearest exit, you can escape the electric shortage.

As a modification, when the own vehicle position detected by the own vehicle position detection unit 3 is on a toll road, the travelable distance drawing unit 10 displays a graph indicating the travel distance on a general road when exiting the toll road. You may display only the graph which shows the driving | running | working distance at the time of a toll road limited use, without displaying. In this case, the icon indicating the second power supply possible point on the general road is not displayed, and only the icon indicating the second power supply possible point on the toll road is displayed. Note that the mark M indicating the nearest exit may or may not be displayed. Figure 5 shows a display mode of the graph G _3, and icons I ₃ in such a modification.

  Further, as another modification, even when a graph indicating the travelable distance when using the toll road only is displayed, it is determined whether it is difficult to reach the second tollable power supply point closest to the vehicle position and this You may comprise so that the graph display color according to a determination result may be changed and a warning may be output.

In addition, the graphs G _{1 to} G ₄ indicating the various travelable distances and the icons I _{1 to} I ₄ indicating the power feedable points are provided with a fuel gauge and a speedometer as shown in FIG. You may make it display in the meter panel 22 (one aspect of the display part 20) of the own vehicle, and you may make it display on the display part 20 of a navigation apparatus regardless of the presence or absence of the destination setting. When displaying on the display unit 20 of the navigation device, the icons I _{1 to} I ₄ are displayed in a selectable state by a touch panel or a remote control, and the navigation device corresponds to the selected icons I _{1 to} I ₄ . You may make it perform the route guidance to the power supply possible point. The route guidance to the corresponding point according to the selection of the icon can also be applied to the mark M indicating the nearest exit and the mark (not shown) indicating the nearest entrance.

  Further, each of the components 3, 5 to 16 described above of the travelable distance display device 1 includes a ROM in which programs and data for executing these functions are stored, a CPU for executing the programs in the ROM, and the CPU This can be realized by a RAM or the like used for temporary storage of the processing results.

  Furthermore, the display of the travelable distance and the icon starts in response to turning on the Acc of the own vehicle or a predetermined display start instruction input using an input means (remote control, touch panel, etc.) by the user. It may be continued (always displayed) until it is turned off or a display end instruction is input.

  Next, an example of the operation of the present embodiment will be described with reference to FIG.

  For the sake of convenience, it is assumed that in the initial state, traveling of the host vehicle has been started, and periodic acquisition of the remaining battery capacity by the remaining battery capacity acquisition unit 4 has been started.

  From the initial state, first, in step 1 (ST1) of FIG. 7, the own vehicle position detection unit 3 determines whether the own vehicle position is on a general road or a toll road. If it is determined in step 1 (ST1) that the vehicle position is on a general road, the process proceeds to step 2 (ST2). If it is determined that the vehicle is on a toll road, step 14 (ST14). Proceed to

  Here, the processing after step 2 (ST2) will be described first. First, in step 2 (ST2), the general road useable travel distance calculation unit 5 performs the general road limited use travelable distance by the above-described method. Calculate

  Next, in step 3 (ST3), the toll road entrance search unit 6 searches for the nearest entrance by the method described above.

  Next, in step 4 (ST4), the tollable road travelable distance calculation unit 7 calculates the tollable road travelable distance by the method described above.

  Next, in step 5 (ST5), the general road power supply possible point search unit 8 searches the first general road power supply possible point by the method described above.

  Next, in step 6 (ST6), the toll road power feedable point search unit 9 searches for the first toll road power feedable point by the method described above.

  Next, in step 7 (ST7), the travelable distance drawing unit 10 displays a graph showing the travelable distance during limited road use calculated in step 2 (ST2) and the pay calculated in step 4 (ST4). A graph showing the travelable distance when using the road is displayed. Also, at this time, the general road power supply possible point icon drawing unit 11 can travel the icon indicating the first general road power supply possible point detected in step 5 (ST5) when using the general road only by the method described above. Display on a graph showing distance. Further, at this time, the icon indicating the first power supply possible point on the toll road detected in step 6 (ST6) is displayed by the toll road power supply possible point icon drawing unit 12 by the above-described method. Display on a graph showing the possible distance.

  Next, in Step 8 (ST8), the available road travel distance and the toll road according to the predetermined cycle described above are calculated by the available road travel distance calculation section 5 and the toll road travel distance calculation section 7 in accordance with the above-described predetermined cycle. It is determined whether or not it is time to recalculate the available travel distance. If a positive determination result is obtained in step 8 (ST8), the process proceeds to step 9 (ST9), and if a negative determination result is obtained, step 8 (ST8) is repeated.

  Next, in step 9 (ST9), the vehicle position detection unit 3 performs the same determination as in step 1 (ST1). If it is determined that the vehicle position is on a general road, step 10 (ST10) If it is determined that the vehicle is on a toll road, the process proceeds to step 14 (ST14).

  Next, in step 10 (ST10), the travelable distance when using the general road is recalculated by the travelable distance calculation unit 5 when using the general road, and when the toll road is used by the travelable distance calculation unit 7 when using the toll road. Recalculate the mileage.

  Next, in step 11 (ST11), the reach difficulty determination unit 13 performs the reach difficulty determination by the method described above. When a positive determination result is obtained in step 11 (ST11), the process proceeds to step 12 (ST12), and when a negative determination result is obtained, the process proceeds to step 13 (ST13).

  Here, when the process proceeds to step 12 (ST12), in this step 12 (ST12), the display color of the graph indicating the travelable distance when using the toll road is set by the travelable distance drawing unit 10 to the normal setting. Then, the process returns to step 7 (ST7). In this case, in step 7 (ST7), the travelable distance drawing unit 10 displays graphs indicating the travelable distance when using the general road and the travelable distance when using the toll road after recalculation. In addition to the display distance being changed, the display color of the graph showing the travelable distance when using the toll road is also changed. Further, when the number of power feedable points existing within the range of the travelable distance is changed, the display number and display position of the icon are also changed. In this case, the warning output unit 14 outputs a warning simultaneously with step 7 (ST7).

  On the other hand, when the process proceeds to step 13 (ST13), in this step 13 (ST13), the display color of the graph indicating the travelable distance when using the toll road is set to the normal setting by the travelable distance drawing unit 10. After maintaining, return to Step 7 (ST7). In this case, in step 7 (ST7), as in the case of returning from step 12 (ST12), a graph indicating the travelable distance after recalculation is displayed. The display color of the graph indicating the distance is maintained at the normal display color.

  Next, the processing after step 14 (ST14) will be described. First, at step 14 (ST14), the tollable road travelable distance calculation unit 7 calculates the tollable road limited travelable distance by the method described above. To do.

  Next, in step 15 (ST15), the toll road exit searching unit 15 searches for the nearest exit by the method described above.

  Next, in step 16 (ST16), the available road travel distance calculation unit 5 calculates the available road travel distance when exiting the toll road by the method described above.

  Next, at step 17 (ST17), the toll road power feedable point search unit 9 searches for the second toll road power feedable point by the method described above.

  Next, in step 18 (ST18), the general road power supply possible point search unit 8 searches for the second general road power supply possible point by the method described above.

  Next, in step 19 (ST19), the travelable distance drawing unit 10 displays a graph showing the travelable distance during toll road limited use calculated in step 14 (ST14), and the charge calculated in step 16 (ST16). A graph showing the distance that can be traveled on ordinary roads when exiting the road is displayed. At this time, the icon indicating the second tollable power supply point detected in step 17 (ST17) by the above-described technique is used by the toll road powerable point icon drawing unit 12 when the toll road limited use is used. It displays on the graph which shows the possible travel distance. Further, at this time, the general road power supply possible point icon drawing unit 11 displays the icon indicating the second general road power supply possible point detected in step 18 (ST18) by the above-described method, and travels on the general road when leaving the toll road. Display on a graph showing the possible distance.

  Next, at step 20 (ST20), the available road travel distance calculation section 5 and the toll road travel distance calculation section 7 use the toll road limited use travel distance and the toll road according to the predetermined cycle described above. It is determined whether or not it is time to recalculate the available road travel distance when exiting. If a positive determination result is obtained in step 20 (ST20), the process proceeds to step 21 (ST21). If a negative determination result is obtained, step 20 (ST20) is repeated.

  Next, in step 21 (ST21), the vehicle position detection unit 3 performs the same determination as in step 1 (ST1). If it is determined that the vehicle position is on the toll road, step 22 (ST22) ), And if it is determined that the vehicle is on a general road, the process proceeds to step 2 (ST2).

  Next, in step 22 (ST22), the tollable road traveling distance calculation unit 7 recalculates the tollable road traveling distance when the toll road limited use is performed, and the toll road escape distance by the ordinary road usage traveling distance calculation unit 5 Recalculate the available road travel distance. After step 22 (ST22), the process returns to step 19 (ST19). In this case, in step 19 (ST19), the graph display distance, the number of displayed icons, and the display position reflect the result of the recalculation in step 22 (ST22).

  Such steps in FIG. 7 may be completed when, for example, Acc of the own vehicle is turned off.

  As described above, according to the present invention, it is possible to use a toll road by displaying a graph that can intuitively grasp a reachable power supply point according to the remaining battery capacity without requiring a complicated operation. This makes it possible to easily and quickly determine whether or not power supply is necessary, and thus avoiding the inability to travel due to lack of electricity.

  In addition, this invention is not limited to embodiment mentioned above, A various change can be made in the limit which does not impair the characteristic of this invention.

  For example, when the remaining battery capacity is sufficient (for example, close to full charge), the power supply possible point near the vehicle position (for example, within 10 km) may be excluded from the icon display target.

  Further, the graph indicating the travelable distance is not limited to the pie chart, and may be a bar graph, for example.

DESCRIPTION OF SYMBOLS 1 Travelable distance display apparatus 2 Map information memory | storage part 3 Own vehicle position detection part 4 Battery remaining capacity acquisition part 5 Travelable distance calculation part at the time of using a general road 6 Toll road entrance search part 7 Travelable distance calculation part at the time of toll road use 8 General road power supply possible point search unit 9 Toll road power supply possible point search unit 10 Travelable distance drawing unit 11 General road power supply possible point icon drawing unit 12 Toll road power supply possible point icon drawing unit

Claims (14)

A travelable distance display device that displays the travelable distance of the vehicle according to the remaining battery capacity of the vehicle on a display unit,
Map information storage means for storing map information;
Own vehicle position detecting means for detecting the own vehicle position;
Battery remaining capacity acquisition means for acquiring the remaining battery capacity;
When the vehicle position detected by the vehicle position detection means is on a general road, the vehicle position is detected from the detected vehicle position based on the battery remaining capacity acquired by the battery remaining capacity acquisition means. A travelable distance calculation means when using a general road, which calculates a travelable distance when using a general road, which is a distance that can be traveled when the car travels only on a general road;
Toll road entrance search means for searching for the entrance of the closest toll road to the detected vehicle position based on the stored map information when the detected vehicle position is on a general road;
After the entrance is detected by the toll road entrance search means, the vehicle is detected by the toll road entrance search means from the detected own vehicle position based on the acquired remaining battery capacity. A tollable road travelable distance calculating means for calculating a travelable distance when using a toll road that is a distance that can be traveled when traveling on the toll road from the detected entrance after traveling on a general road to the entrance;
Based on the stored map information, on a general road whose distance from the detected vehicle position is within the normal road limited travelable distance calculated by the general road travelable distance calculation means A search method for points that can supply power on general roads,
Based on the stored map information, the toll road whose distance from the detected own vehicle position is within the travelable distance when using the toll road calculated by the travel distance calculation means when using the toll road A search method for points on the toll road where power can be supplied
A travelable distance display means for simultaneously displaying on the display unit a graph indicating the calculated travelable distance when using the general road only and a graph indicating the calculated travelable distance when using the toll road;
Power can be supplied on the general road detected by the general road power supplyable point search means from the detected own vehicle position on the graph indicating the travelable distance during limited road use displayed by the travelable distance display means. On the road corresponding to the distance to the point, an icon indicating the power supply possible point icon display means for displaying the icon indicating the detected power supply possible point on the general road,
Power feeding on the toll road detected by the tollable power point search means on the toll road from the detected own vehicle position on the graph indicating the travelable distance when using the toll road displayed by the travelable distance display means. A tollable distance display, comprising: a toll road power feedable point icon display means for displaying an icon indicating the detected tollable power point on the toll road at a position corresponding to the distance to the possible point. apparatus. The on-road power supplyable point icon display means displays an icon indicating a detected power-supplyable point on the general road whose distance from the detected vehicle position is within a predetermined distance. Item 2. The travelable distance display device according to item 1. The travel distance calculation means when using the general road recalculates the travel distance when using the general road every predetermined cycle,
The travelable distance calculation means when using the toll road recalculates the travelable distance when using the toll road for each predetermined period,
The travelable distance display means is capable of changing a display distance of a graph indicating the travelable distance when using the general road only in accordance with recalculation of the travelable distance when using the general road only, and the toll road The display distance of the graph showing the travelable distance when using the toll road can be changed according to the recalculation of the travelable distance when using,
The general road power feedable point icon display means is capable of changing the number of icons indicating the detected power feedable points on the general road according to the recalculation of the travel distance allowed when using the general road only,
The toll road power feedable point icon display means can change the number of icons indicating the detected power feedable points on the toll road according to the recalculation of the travelable distance when using the toll road. The travelable distance display device according to claim 1 or 2, characterized by: Based on the result of recalculation of the travelable distance when using the toll road and the position of the feedable point on the detected toll road that is closest to the detected entrance, the vehicle is moved from the detected entrance. When it enters into the toll road, it comprises a point on the toll road power supply reachable difficulty determination means for determining whether it is difficult to reach the nearest power feedable point on the toll road,
The travelable distance display means displays a predetermined display color of a graph indicating the travelable distance when the toll road is used when a positive determination result is obtained by the power supply reachable point reach difficulty determination means on the toll road. The travelable distance display device according to any one of claims 1 to 3, wherein the display is performed in a display color different from a normal display color. 5. The apparatus according to claim 4, further comprising warning means for outputting a warning so as not to enter the toll road when a positive determination result is obtained by the toll-feedable point reach difficulty determining means on the toll road. Row distance display device. When the detected vehicle position is on a toll road,
The travelable distance calculation means when using the toll road is a charge that is a distance that can be traveled when the vehicle travels only on a toll road from the detected vehicle position based on the acquired remaining battery capacity Calculate the travel distance when using the road only,
Based on the stored map information, the tollable power supply point search means is configured to calculate the distance from the detected vehicle position as the power supplyable point on the toll road when the toll road is used. Searching for a power feedable point on the second toll road that is within the travelable distance when using the toll road only, calculated by the calculation means;
The travelable distance display means displays a graph showing the calculated travelable distance when using the toll road only on the display unit,
The toll road power feedable point icon display means can feed power on the toll road from the detected own vehicle position on the graph indicating the travelable distance when the toll road limited use is displayed displayed by the travelable distance display means. An icon indicating the detected power supply point on the second toll road is displayed at a position corresponding to the distance to the power supply possible point on the second toll road detected by the point search means. The travelable distance display device according to any one of claims 1 to 5. The travelable distance calculation means when using the toll road recalculates the travelable distance when using the toll road only at predetermined intervals,
The travelable distance display means is capable of changing a display distance of a graph indicating the travelable distance when using the toll road only in accordance with the recalculation of the travelable distance when using the toll road only,
The toll road power supplyable point icon display means is capable of changing the number of icons indicating the power supplyable points on the second toll road according to the recalculation of the travelable distance when using the toll road only. The travelable distance display device according to claim 6, wherein: Toll road exit search means for searching for the exit of the toll road nearest to the detected car position based on the stored map information when the detected car position is on a toll road. Prepared,
When the detected vehicle position is on a toll road,
The travelable distance calculation means when using the general road is detected when the vehicle travels only on a general road after exiting the toll road from the exit detected by the toll road exit search means. Calculate the distance that can be traveled on a general road when exiting a toll road, which is the distance from the exit.
Based on the stored map information, the ordinary road power supplyable point search means calculates the distance from the detected exit as the power supplyable point on the general road by the travel distance calculation means when using the general road. Search for a power supply possible point on the second general road that is within the allowable travel distance of the general road when exiting the toll road,
The travelable distance display means displays a graph showing the calculated travel distance on a general road when exiting the toll road on the display unit,
The general road power supplyable point icon display means is the general road power supplyable point search means from the detected exit on the graph indicating the general road travelable distance when exiting the toll road displayed by the travelable distance display means. The icon indicating the detected power supply point on the second general road is displayed at a position corresponding to the distance to the power supply possible point on the second general road detected by the above-mentioned item. Or the travelable distance display apparatus of Claim 7. The travel distance calculation means when using the general road recalculates the travel distance of the general road when exiting the toll road every predetermined cycle,
The travelable distance display means is capable of changing a display distance of a graph indicating the travel distance on a general road when exiting the toll road according to recalculation of the travel distance on a general road when exiting the toll road,
The on-road power supplyable point icon display means is capable of changing the number of icons indicating the power-supplyable points on the second general road according to recalculation of the general road travelable distance when exiting the toll road. The travelable distance display device according to claim 8. When the detected vehicle position is on a toll road, a position corresponding to the detected exit on the graph showing the tollable distance when using the toll road only when displayed on the tollable distance display means The travelable distance display device according to claim 8 or 9, further comprising toll road exit display means for displaying a mark indicating the exit. When the detected vehicle position is on a toll road, the travelable distance display means displays only a graph indicating the calculated travelable distance when using the toll road only on the display unit. The travelable distance display device according to claim 6, wherein the travelable distance is displayed. The graph is a pie chart in which the calculation result of the travelable distance calculation means when using the general road and the calculation result of the travelable distance calculation means when using the toll road exhibit concentric arcs facing each other. The travelable distance display device according to any one of claims 1 to 11, wherein The travelable distance display according to any one of claims 1 to 12, wherein the graph indicating the travelable distance is displayed in a meter panel of the host vehicle or on a display unit of a navigation device. apparatus. The graph indicating the travelable distance is displayed on the display unit of the navigation device,
The icon indicating the power supply possible point is displayed on the graph so as to be selectable,
The travelable distance display device according to any one of claims 1 to 12, wherein the navigation device performs route guidance to the feedable point corresponding to the selected icon.

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