JP2010286400A - Navigation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a navigation device that allows accurate determination of the travelable distance of an electric vehicle. <P>SOLUTION: The navigation device includes a search means mountable on an electric vehicle traveling, by using electric power supplied from a battery to search for a guidance route to a destination; a traveling time calculation means for calculating traveling time, when traveling the guidance route; an electric power consumption estimating means for estimating electric power consumption by head lights, based on the traveling time; a travelable distance calculation means for calculating a travelable distance on the guidance route from the estimated power consumption and residual charge in the battery; and a presenting means for presenting calculated travelable distance. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a navigation device having a function of guiding a route to a destination, and more particularly to a navigation device used in an electric vehicle.

  A battery-powered electric vehicle has a mechanism for obtaining a driving force by driving a motor with electric power supplied from a battery. Electric vehicles have the advantages of lower noise and less carbon dioxide emissions than automobiles powered by internal combustion engines such as gazolin engines and diesel engines, but they are more expensive and require a single battery charge. It has shortcomings such as short driving distance and insufficient battery charging stand.

  For example, Patent Document 1 discloses a remaining capacity meter that can accurately and reliably know the remaining capacity of an in-vehicle battery. Patent Document 2 discloses a technique for identifying and displaying the position of a charging station in the vicinity of the vehicle position according to the arrival possibility when the remaining battery level of the electric vehicle is equal to or less than a threshold value.

JP-A-7-260904 Japanese Patent Laid-Open No. 9-210702

  In a conventional navigation device mounted on an electric vehicle, a travelable distance to a destination is calculated on the assumption that the remaining amount of battery is consumed for driving a motor for traveling. When traveling in the daytime, the difference between the calculated travelable distance and the actually travelable distance is small, and the influence on the arrival determination result to the destination or the charging station is small. However, when driving at night, the battery power is also consumed to turn on the headlights, so the difference between the calculated driving distance and the actual driving distance increases and arrives at the destination. There is a risk that it will not be possible to travel on the way. In addition, there are equipment that consumes power such as audio / video playback devices, TV / radio tuners, and air conditioners in the car. It varies greatly, and it is expected that the difference between the travelable distance calculated by the navigation device and the actual travel distance will increase as described above.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a navigation device that can accurately determine the travelable distance of an electric vehicle.

  A navigation device according to the present invention can be mounted on an electric vehicle that travels using electric power supplied from a battery, and includes a search unit that searches for a guide route to a destination, and a travel when traveling on the guide route. Driving time calculating means for calculating time, power consumption predicting means for predicting power consumption when using electric vehicle equipment based on the driving time, derived from the predicted power consumption and the remaining battery level A travelable distance calculating unit that calculates a travelable distance on the route, and a presentation unit that presents the calculated travelable distance.

  Preferably, the navigation device further includes arrival determination means for comparing the travelable distance and the distance to the destination to determine whether or not the destination can be reached, and the presentation means is determined by the arrival determination means Present the results. Preferably, the travelable distance calculating means calculates the travelable distance when the use time of the equipment is zero when the arrival determining means determines that the destination cannot be reached, and the presenting means Presents the travelable distance when the use time of the equipment is zero. Preferably, the power consumption prediction means estimates a usage time of the headlight of the electric vehicle, and predicts a power consumption of the headlight from the estimated usage time of the headlight. Preferably, the power consumption prediction means includes calendar information relating to sunrise and sunset, and estimates the usage time of the headlight based on the calendar information. Preferably, the search means searches for a plurality of guide routes to a destination, and the travelable distance calculation means calculates travelable distances of the plurality of guide routes. Preferably, the navigation device further includes acquisition means for acquiring traffic jam information, and the travel time calculation means calculates the travel time based on the traffic jam information acquired by the acquisition means. Preferably, the navigation device further includes search means for searching for a charging facility of the battery when the arrival determination means determines that the destination cannot be reached, and the presenting means is searched by the search means. Present the charging facility on the road map.

A further navigation apparatus of the present invention can be mounted on an electric vehicle that travels using electric power supplied from a battery, and includes a search means for searching for a guidance route to a destination, and an electric vehicle equipped in accordance with a user input. Power consumption predicting means for predicting power consumption when using a product, travelable distance calculating means for calculating a travelable distance on a guidance route from the predicted power consumption and the remaining amount of the battery, and the calculated Presenting means for presenting the travelable distance,
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  According to the present invention, it is possible to accurately determine the travelable distance by predicting the power consumption of automobile equipment. Further, by predicting the power consumption according to the input from the user, it is possible to determine the travelable distance according to the user's preference.

It is a block diagram which shows the structure of the navigation apparatus which concerns on the Example of this invention. It is an example of the calendar information regarding sunrise and sunset. FIG. 2 is a functional block diagram of a travelable distance determination program shown in FIG. 1. It is a flowchart which shows the driving distance determination operation | movement of the navigation apparatus which concerns on 1st Example of this invention. It is an example of a display when the travelable distance is determined. It is an example of a display of travelable distance determination when searching the some guidance route in the navigation apparatus which concerns on 2nd Example of this invention. It is an example of the input determination table of travelable distance determination according to the user input of the equipment of a vehicle in the navigation apparatus which concerns on 3rd Example of this invention. It is a flowchart which shows the driving distance determination operation | movement of the navigation apparatus which concerns on 4th Example of this invention. It is a flowchart which shows the search operation of the charging station in the navigation apparatus which concerns on 5th Example of this invention. It is an example of a display of the charging stand by the 5th Example of this invention.

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

  FIG. 1 is a block diagram showing a typical configuration of a navigation apparatus according to an embodiment of the present invention. The navigation device 10 is distributed from a bus interface (I / F) 20 that receives a signal related to the state of the vehicle from an in-vehicle bus, a GPS receiver 30 that receives a signal from a GPS satellite and detects the position of the vehicle, and a VICS center. A VICS receiver 40 that receives road traffic information, an input unit 50 that receives input from a user, a communication control unit 60 that performs data communication with an external device wirelessly or by wire, and a storage unit 70 that includes a storage medium such as a large-capacity hard disk A sound output unit 80 for outputting sound from the speaker 82, a display control unit 90 for displaying an image such as a road map on the display 92, a program memory 100 for storing a program, a data memory 110 for temporarily storing data, and a program It is configured to include a control unit 120 that controls each unit by executing.

  The bus I / F 20 is a detection signal from a self-contained navigation sensor (for example, a vehicle speed sensor, an acceleration sensor, a gyro sensor, etc.), a signal indicating parking on / off, and a signal indicating the remaining battery level for driving an electric vehicle. The information regarding the vehicle such as the above is received and provided to the control unit 120. The VICS receiver 40 receives road traffic information including real-time traffic jam information distributed from the VICS center side by optical beacon, radio beacon, FM multiplex broadcasting, and the like, and provides it to the control unit 120. The input unit 50 includes an operation panel 52 that enables input by touching the display 92, a voice input unit 54 that enables input by voice, and a remote controller 56.

  The storage unit 70 stores road map data necessary for navigation. The road map data includes link data for identifying roads, node data for identifying intersections, facility data for identifying POIs such as facilities, and the like. The link data includes road type, road name, width, regulation, coordinates of start node and end node, and the like. The intersection node includes information indicating a connection relationship with the start node and the end node of the link node and information such as an intersection type. The facility data includes a facility equipped with a battery charging facility and a battery charging station.

  The storage unit 70 further includes calendar information regarding sunrise and sunset of the sun. For example, as shown in FIG. 2, a table indicating the sunrise and sunset times is provided for each of a plurality of areas (A region, B region,... N region). This table stipulates seasonal sunrise and sunset times in units of three months, but this is an example, and a detailed monthly or weekly sunrise and sunset time table is provided. You may make it prepare. Further, the area may be classified by latitude, longitude, and the like.

  The program memory 100 includes an own vehicle position calculation program 102 that calculates the own vehicle position based on detection signals from the self-contained navigation sensor and the GPS receiver 30, and an optimum guidance route from the own vehicle position and other start positions to the destination. A guidance route guidance program 104 for searching and guiding the information, a travelable distance determination program 106 for determining a travelable distance of the electric vehicle, and the like are included. The data memory 110 includes own vehicle position information 112 calculated by the own vehicle position calculation program, road map data 114 around the own vehicle position read from the storage unit 70, guidance route information 116 searched by the guidance route guidance program 106, The result of other arithmetic processing is stored.

  FIG. 3 is a functional block diagram of the travelable distance determination program shown in FIG. The travelable distance determination program 106 includes a recommended time calculation unit 130 that calculates a recommended time during which the electric vehicle recommends driving with the headlights turned on, and a light power consumption calculation that calculates power consumed by lighting the headlights. 131, a battery remaining amount updating unit 132 that updates the remaining battery level that can be used for traveling in consideration of the power consumption of the headlight, a travelable distance calculating unit 133 that calculates a travelable distance from the updated remaining battery level, An arrival determination unit 134 that determines whether or not the automobile can arrive at the destination, and a presentation unit 135 that presents the calculation result of the travelable distance calculation unit 133 and the determination result of the arrival determination unit 134 are included.

  The recommended time calculation unit 130 calculates a recommended time T for turning on the headlight from the departure time and the estimated arrival time at the destination when the guidance route to the destination is searched. Preferably, the recommended time calculation unit 130 refers to the calendar information shown in FIG. 2, selects an area corresponding to the starting point or destination, selects a corresponding season from the selected area, and selects the day from sunrise. The daytime time zone and the night time zone other than that are calculated, and the recommended time T of the headlight is calculated from these information, the departure time and the estimated arrival time.

  When the scheduled arrival time of the destination overlaps with the night time zone, the overlap time can be set as the recommended time of the headlight. Moreover, when the departure time overlaps with the night time zone, the overlap time can be set as a recommended time for lighting the headlight. For example, when the sunrise time is AM 6:00, the sunset time is PM 5:00, the departure time is PM 3:00, and the estimated arrival time is PM 8:00, the recommended headlight lighting time T is PM 5: It is calculated as 3 hours from 00 to PM 8:00. In addition, when the departure time is AM 4:00 and the scheduled arrival time is AM 9:00, the recommended headlight lighting time T is calculated as 2 hours of AM 4:00 to AM 6:00. The above calculation method is an example, and the recommended headlight time can be calculated with a certain time width from the sunrise and sunset times as a reference. For example, when the sunset is at 5:00 PM, the recommended headlight time may start from PM4: 30, or when the sunrise is at 6:00 AM, the recommended headlight time at AM: 6: 30 May be terminated.

  The light power consumption calculation unit 131 calculates the power consumption W of the headlight from the recommended time T calculated by the recommended time calculation unit 130. Preferably, the power consumption H per unit time when the headlight is used is stored in the storage unit 70, and the headlight consumption is calculated from the product of the recommended headlight lighting time T and the power consumption H per unit time. Electric power W (W = T × H) is calculated.

  The battery remaining amount updating unit 132 can use the remaining amount of battery received from the bus I / F 20 and the power consumption W calculated by the light power consumption calculating unit 131 to travel to the destination. Update. This is calculated based on a relational expression prepared in advance.

  The travelable distance calculation unit 133 calculates the travelable distance from the remaining battery level updated by the remaining battery level update unit 132. Preferably, the travelable distance calculation unit 133 refers to the link data specified by the guidance route to the destination, extracts the link travel time included in the link data, and calculates the travelable distance from the link travel time. To do. The link travel time represents the travel time of the link defined by the travel speed, road type, number of lanes, and other parameters set for the link. The travelable distance calculation unit 133 calculates a travelable distance from the remaining battery level and the link travel time using a relational expression prepared in advance. However, the calculation method of the travelable distance is not limited to this. For example, if the power consumption per unit time is known from the relationship between the distance and the speed, the travelable distance is calculated based on the total remaining amount of the battery and the link. Can be calculated.

  The arrival determination unit 134 compares the travelable distance calculated by the travelable distance calculation unit 133 with the distance to the destination, and determines whether or not the host vehicle can reach the destination. If the arrival determination unit 134 determines that it cannot arrive at the destination, the arrival determination unit 134 specifies a position (stop position) up to the travelable distance D.

  When the arrival determining unit 134 determines that the destination can be reached, the presenting unit 135 displays that fact on the navigation screen or outputs it by voice. When it is determined that the destination cannot be reached, the point where the destination can be reached is clearly indicated. Furthermore, a point where lighting of the headlight starts may be displayed together.

  Next, the travelable distance determination operation of the navigation device of this embodiment will be described with reference to the flowchart of FIG. First, when the user sets a destination, the guidance route guidance program 104 is executed, and a guidance route from the current location or a designated departure location to the destination is searched (step S101). Thereby, information such as the time of the departure point and the estimated arrival time to the destination can be obtained.

  Next, the recommended time calculation unit 130 calculates the recommended headlight lighting time from the departure point time, the estimated arrival time, and the sunrise and sunset times (step S102). If the recommended time is zero, the light power consumption calculation unit 131 determines that the headlight is not used, and does not calculate the power consumption. On the other hand, if there is a recommended time, the write power consumption calculation unit 131 calculates the power consumption of the headlight based on the recommended time (step S104).

  Next, the remaining battery level update unit 132 updates the remaining battery level available for running the electric vehicle from the difference between the remaining battery level from the bus I / F 20 and the power consumption calculated by the light power consumption calculation unit 131. (Step S105). Next, the travelable distance calculation unit 133 calculates a travelable distance from the updated battery remaining amount (step S106), and the arrival determination unit 134 compares the travelable distance with the travel distance to the destination to compare the purpose. It is determined whether or not it can arrive at the ground (step S107).

  When the presentation unit 135 receives the determination result of the arrival determination unit 134 and can arrive at the destination, it presents that it can arrive on the navigation screen (step S108), and when it cannot arrive at the destination, The fact that it cannot arrive and the point where it can arrive is displayed on the guidance route (step S109).

  When it is determined that the destination cannot be reached, the following modifications can be made. The travelable distance when the use of the headlight is assumed to be zero is calculated and presented to the user. In this case, the arrival determination unit 134 causes the battery remaining amount updating unit 132 to update the remaining amount with the power consumption of the headlight being zero (same meaning as zero recommended time), and causes the travelable distance calculating unit 133 to travel the travelable distance Is calculated. Alternatively, the recommended time of the headlight that can be consumed to arrive at the destination is calculated backward and presented to the user.

  FIG. 5 is a display example of the navigation screen. In FIG. 5A, the estimated travel time from the departure point S to the destination G is 9:00 to 15:00, and the guidance 200 is displayed. Although it is running in the daytime, the guidance 200 indicates that the recommended lighting time is 17:00, and if it is running later than that, the remaining battery level will decrease and the available driving distance will vary. It expresses what to do. Further, an identification display N (hatching in the drawing) indicating that it is a travelable distance from the departure point S to the destination G is drawn on the guidance route.

  In FIG. 5B, the estimated travel time is from 15:00 to 21:00, and the guidance 210 is displayed. The recommended lighting time is 17:00, and the lighting start point P at that time is displayed on the guidance route. Further, in the example shown in the figure, the remaining battery level is reduced due to lighting of the headlight, and the identification display N ends before the destination G. That is, the terminal Q of the identification display N indicates the maximum travelable distance, and expresses that the destination G cannot be reached by using the headlight. As shown in FIGS. 5 (a) and 5 (b), when a mileage fluctuation may occur by displaying a stand GS capable of charging the battery on the guidance route, the battery is removed. We are alerting you not to miss the timing of charging.

  As described above, according to the present embodiment, the power consumption of the headlight is predicted based on the recommended time of the headlight, and the remaining battery distance is updated to determine the travelable distance. Even when the remaining amount fluctuates, the travelable distance can be accurately determined. In addition, even when the user turns on the headlight during traveling, the user can arrive at the destination without worrying about fluctuations in the remaining battery level.

  In the above embodiment, an example of predicting the power consumption of the headlight as the equipment of the vehicle from the traveling time on the guidance route is shown. However, if the equipment can predict the power consumption, Similarly, the travelable distance may be determined in consideration of the power consumption.

  Next, a second embodiment of the present invention will be described. When setting the destination, the guide route guidance program 104 can search for a plurality of guide routes according to different search conditions. For example, there are a guidance route Y1 that gives priority to general roads, a guidance route Y2 that gives priority to highways, and a guidance route Y3 that gives priority to travel distance. If the guidance routes Y1 to Y3 are different, the estimated arrival time to the destination is different, and the recommended headlight time is different, so the travelable distance varies.

  FIG. 6 is a display example of a determination result of the travelable distance when searching for a plurality of guidance routes. The determination result indicates the type of guidance route, the estimated arrival time, the recommended headlight time, the travelable distance, and the arrival determination. The user can select a desired guide route by looking at the display result.

  Next, a third embodiment of the present invention will be described. In the first embodiment, the power consumption of the headlight is predicted and the travelable distance is determined. In the third embodiment, the power consumption of the equipment mounted on the vehicle is predicted and the travelable distance is determined. judge. For example, an audio / video (AV) playback device for playing back audio data and video data such as a CD and a DVD, and a television set that can be selected according to the user's preference. There are receivers for receiving broadcasts and radio broadcasts, navigation devices, air conditioners, and the like. In the case of an electric vehicle, these equipments also consume battery power, so the mileage varies. However, since these equipments are based on user preference, it is difficult to predict the usage state. Therefore, in the third embodiment, the usage time of the equipment is set as a user input, and the travelable distance and the arrival determination result which are fluctuated thereby are presented to the user.

  FIG. 7 is a user input table for determining the travelable distance, and is preferably displayed on the display 92. In the determination table, the user can input a desired usage time for the equipment (AV playback device, television receiver, radio receiver, navigation device, air conditioner, etc.) mounted on the vehicle. It has become. When the usage time is input, the light power consumption calculation unit 131 shown in FIG. 3 calculates the power consumption based on a formula prepared in advance, and the battery remaining amount update unit 132 updates the battery remaining amount. The possible distance calculation unit 133 calculates a travelable distance. Then, the calculated travelable distance is displayed in the table of FIG. The arrival determination unit 134 determines arrival at the destination, and the presentation unit 135 displays the arrival determination result in the table of FIG. The user can input the usage times of a plurality of equipments at the same time, and in that case, it is possible to present the total travelable time and its arrival determination result. Moreover, since the determination of the travelable distance described above can be performed while the host vehicle is traveling, the user can recognize the travelable distance that varies in real time reflecting his / her preference.

  Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, the travelable distance is determined with reference to road traffic information acquired from VICS and other road traffic information distribution services. Note that VICS is a service that provides users with road traffic information such as traffic jams, accidents, and road closures in real time. Hereinafter, an example in which traffic jam information is acquired from the VICS will be described.

  FIG. 8 is a flowchart showing the determination operation of the travelable distance of the navigation device according to the fourth embodiment of the present invention. When the updated road traffic information is received by the VICS receiver 40 shown in FIG. 1 (step S201), the control unit 120 analyzes the road traffic information (step S202) and extracts traffic jam information therefrom. Next, the control unit 120 determines whether or not the traffic jam information is on the guidance route (step S203), and when the traffic jam occurs on the guidance route, recalculates the estimated arrival time of the destination. (Step S204). For example, the VICS can deliver the traffic information with the increased cost of the link travel time of the link where the traffic congestion has occurred to the navigation device, and the control unit 120 calculates the estimated arrival time using the link travel time. can do.

  Next, as in the first embodiment, the recommended time calculation unit 130 calculates the recommended time of the headlight, the write power consumption calculation unit 131 calculates the power consumption based on the recommended time of the headlight, The battery remaining amount update unit 133 updates the remaining amount, and the travelable distance calculation unit 133 calculates the travelable distance again based on the updated battery remaining amount (step S205). Next, the arrival determination unit 134 determines whether or not the destination can be reached (step S206), and information corresponding to the determination result is presented to the user.

  As described above, according to the fourth embodiment, since the power consumption of the headlight is predicted with reference to real-time road traffic information, the travelable distance can be determined more accurately. In the above embodiment, the traffic jam information is exemplified. However, it is also possible to predict the power consumption of the headlight by recalculating the estimated arrival time with reference to other road traffic information such as traffic closures and regulations.

  Further, when the control unit 120 has a function of automatically re-searching the detour when traffic jams or traffic closures occur on the guide route, the control unit 120 is similar to the above for the guide route including such a detour. The travelable distance can be determined by the method.

  Next, a fifth embodiment of the present invention will be described. In the fifth embodiment, when it is determined that the vehicle cannot arrive at the destination, the battery charging station within the range of the travelable distance is searched and displayed. Therefore, in the fifth embodiment, the guidance route search program 106 further includes a charging station search unit that searches for charging stations on and around the guidance route.

  FIG. 9 is a flowchart showing the search operation of the charging station according to the fifth embodiment. As described in the first embodiment, when the arrival determination unit 134 determines that it is not possible to arrive at the destination if the vehicle continues running with the current remaining battery level (step S301), the charging station search unit The storage unit 70 is referred to search for a charging station that is within the travelable distance (step S302).

  The charging station search unit further determines whether or not the searched charging station is on the guidance route (step S303), and if it is a charging station on the guidance route, it is highlighted on the road map (step S303). If it is not a charging station other than the guide route (S304), it is displayed by a normal method (step S305). This alerts the user.

  FIG. 10 is a display example of the searched charging station. The charging stands 220 and 221 installed along the guiding route Y are displayed in an emphasized manner, and the charging stand 230 that is out of the guiding route Y is displayed in a normal manner. Further, since the charging stand 221 is the last charging stand before the travelable position Q, the charging stand 221 may be blinked or colored to stand out from the charging stand 220 and call attention. Furthermore, when the facility genre of the charging station desired by the user and the brand of the charging station are set, these may be preferentially displayed. As described above, according to the fifth embodiment, when the battery needs to be charged, the charging station on the guidance route can be searched and presented, so that the charging station immediately before the travelable point is overlooked. Can be avoided.

  The preferred embodiment of the present invention has been described in detail above, but the present invention is not limited to the specific embodiment, and various modifications can be made within the scope of the present invention described in the claims. Deformation / change is possible.

10: Navigation device 20: Bus interface (I / F)
30: GPS receiver 40: VICS / FM multiplex receiver 50: input unit 60: communication control unit 70: storage unit 80: audio output unit 90: display control unit 100: program memory 110: data memory 120: control unit N: travel Possible distance identification display P: Headlight lighting start point Q: End of identification display N (maximum travelable distance)
Y: Guide route

Claims (9)

A navigation device that can be mounted on an electric vehicle that runs using electric power supplied from a battery,
Search means for searching for a guidance route to the destination;
Travel time calculating means for calculating a travel time when traveling on the guidance route;
Power consumption predicting means for predicting power consumption when using electric vehicle equipment based on the travel time;
A travelable distance calculating means for calculating a travelable distance on the guidance route from the predicted power consumption and the remaining amount of the battery;
Presenting means for presenting the calculated travelable distance;
A navigation device. The navigation device further includes arrival determination means for comparing the travelable distance and the distance to the destination to determine whether or not the destination can be reached, and the presenting means displays the determination result by the arrival determination means. The navigation device according to claim 1, wherein the navigation device is presented. The travelable distance calculation means calculates a travelable distance when the use time of the equipment is zero when the arrival determination means determines that the destination cannot be reached, and the presentation means The navigation device according to claim 2, wherein a travelable distance when the usage time of the equipment is zero is presented. The navigation according to any one of claims 1 to 3, wherein the power consumption prediction means estimates a usage time of a headlight of an electric vehicle, and predicts a power consumption of the headlight from the estimated usage time of the headlight. apparatus. The navigation device according to claim 4, wherein the power consumption prediction unit includes calendar information regarding sunrise and sunset, and estimates a usage time of a headlight based on the calendar information. The navigation device according to claim 1, wherein the search unit searches for a plurality of guide routes to a destination, and the travelable distance calculation unit calculates a travelable distance of the plurality of guide routes. The navigation device according to claim 1, further comprising an acquisition unit that acquires traffic jam information, wherein the travel time calculation unit calculates the travel time based on the traffic jam information acquired by the acquisition unit. The navigation device further includes search means for searching for a charging facility of the battery when the arrival determination means determines that the destination cannot be reached, and the presenting means is the charging facility searched by the search means. The navigation device according to claim 2, wherein the navigation device is presented on a road map. A navigation device that can be mounted on an electric vehicle that runs using electric power supplied from a battery,
Search means for searching for a guidance route to the destination;
Power consumption predicting means for predicting power consumption when using electric vehicle equipment according to user input;
A travelable distance calculating means for calculating a travelable distance on the guidance route from the predicted power consumption and the remaining amount of the battery;
Presenting means for presenting the calculated travelable distance;
A navigation device.

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