JP5903905B2 - Navigation device - Google Patents

Description

  The present invention relates to a navigation device mounted on an electric vehicle that travels using electric power stored in a power storage device.

  Conventionally, electric vehicles that run on electric power (hereinafter referred to as “electric vehicles” including plug-in hybrid vehicles) have a shorter cruising range than internal combustion locomotives and have a charging infrastructure (charging facility) However, the driver of the electric vehicle had to drive while always paying attention to the remaining battery level and the cruising range.

  In order to deal with such a problem, for example, in Patent Document 1 below, an operation mode in which the battery consumption is minimized in order to reach the destination from the current location is obtained, and excessive acceleration is commanded from the driver. In some cases, there is disclosed a technique for performing navigation of a travel route by limiting battery power consumption in a case, extending a cruising distance, and minimizing battery power consumption in an electric vehicle. Patent Document 2 below discloses a technique for determining whether or not cruising is possible by comparing required energy and available energy in consideration of changes in vehicle weight.

JP-A-8-178683 JP 2010-239684 A

  The cruising range fluctuates depending on the vehicle load (for example, running resistance, air conditioner operating conditions, etc.), so there is a possibility of power shortage (power shortage) to the initially set destination point. Reroute may be required. In the above-described prior art, the cruising distance is calculated using the past average power consumption value of the target vehicle, and the cruising distance is reduced by 1 km when the target vehicle travels 1 km (the cruising distance ideal value) and the current value. Compared with the cruising range value, it is determined whether or not there is a shortage of electricity to the charging facility that was initially set. However, in this method, the comparison result between the ideal cruising range and the current cruising range differs greatly depending on the difference in the starting point of the ideal cruising range, that is, the cruising range at the time of setting the destination point. There is a problem that it is not possible to determine whether there is a lack or to reroute.

  The present invention has been made in view of the above-described problems of the prior art, and in an electric vehicle that travels using the electric power stored in the power storage device, the presence / absence of electric shortage to the destination point is accurately determined, It is an object of the present invention to provide a navigation device that can reach a destination point without being in a missing state.

In order to solve the above-described problems and achieve the object, a navigation device according to the present invention is a navigation device mounted on an electric vehicle that travels using electric power stored in a power storage device, and a route to a destination point. The remaining power amount information acquiring means for acquiring the remaining power amount information of the power storage device and the remaining power amount information acquiring means during the guidance of the route searched for by the searching means. Determining means for determining whether or not the electric vehicle can travel to the destination using the remaining electric power in the power storage device based on the remaining electric energy information and the mode electric power consumption value of the electric vehicle; wherein the determining means, wherein the amount of power remaining in the power storage device by dividing the mode fuel efficiency value to calculate the mode conversion cruising distance of the electric vehicle, the eye and the current location of the electric vehicle When the value obtained by subtracting the mode-converted cruising distance from the remaining travel distance to the point is 0 or more and the variation rate of the mode-converted cruising distance is a predetermined value or less, the electric vehicle is When it is determined that the electric vehicle cannot travel to the destination point by the determination unit, the search unit determines a charging facility located in a range where the remaining electric power can be used when the determination unit determines that the electric vehicle cannot travel to the destination point. It is characterized by searching for a route as a new destination point.

According to the present invention, based on the remaining electric energy information of the electric vehicle and the mode power consumption value, it is determined whether the electric vehicle can travel to the destination using the remaining power in the power storage device, and the vehicle travels to the destination. When it is determined that it is not possible, a route is searched for using a charging facility located in a range where the vehicle can travel using the remaining power as a new destination point. Since the mode power consumption value is always a constant value unlike the past average power consumption value of the electric vehicle, it is possible to accurately determine the lack of electricity regardless of the calculation timing of the cruising range. Further, it is possible to detect that the power consumption state is remarkably worse than that in the mode running. Furthermore, when it is determined that there is a shortage of electricity, the reroute is performed so as to stop at the charging facility on the way, so that it is possible to prevent the remaining power from running out and becoming unable to travel.

According to the present invention, when the value obtained by subtracting the mode conversion cruising distance from the remaining travel distance is equal to or greater than a predetermined value, it is determined that the vehicle cannot travel to the destination point. The value obtained by subtracting the mode conversion cruising distance from the remaining travel distance is equal to or greater than the predetermined value is a case where there is no clear remaining power for traveling the remaining travel distance. As a result, it is possible to stop at another charging facility and perform charging while the vehicle is traveling, and it is possible to prevent the remaining power from running short and being unable to travel.

According to the present invention, when the value obtained by subtracting the mode-converted cruising distance from the remaining travel distance is 0 or more and the variation rate of the mode-converted cruising distance is a predetermined value or less, the electric vehicle moves to the destination point. Judge that it is not possible to run. As a result, even if the cruising range is somewhat increased due to power generation due to regenerative power, etc., there is a high possibility that it will not be possible to reach the destination point. It is possible to prevent the vehicle from running.

According to the present invention, the variation rate of the mode-converted cruising distance is calculated by subtracting the previously calculated mode-converted cruising distance from the mode-converted cruising distance calculated this time. Calculate by dividing by the interval. That is, the variation rate refers to the mode-converted cruising range variation per unit time. By calculating the change rate of the mode-converted cruising distance, it is possible to detect that the remaining power amount has fluctuated rapidly due to, for example, a change in the vehicle weight or a change in the operating state of the air conditioner.

According to the present invention, the mode conversion cruising distance is calculated, the cruising distance is calculated based on the past average power consumption value, and the value obtained by subtracting the cruising distance from the mode conversion cruising distance is a predetermined value or more. In addition, it is determined that the electric vehicle cannot travel to the destination point. Since the cruising distance based on the past average electricity cost value reflects the current road condition and vehicle condition, it is possible to more reliably determine whether or not power is missing.

According to the present invention, when the value obtained by subtracting the variation rate of the cruising range from the variation rate of the mode-convertible cruising range is equal to or greater than a predetermined value, it is determined that the electric vehicle cannot travel to the destination point. Thereby, even when the value obtained by subtracting the cruising range from the mode-converted cruising range is less than the predetermined value, the reroute can be performed if there is a possibility of electric shortage.

According to the present invention, since the mode-converted cruising range and the fluctuation rate of the cruising range are calculated, it is possible to more accurately detect the fluctuations in the remaining electric energy and the electricity cost.

It is a block diagram which shows the hardware constitutions of the navigation apparatus concerning embodiment. It is explanatory drawing which shows typically the electric shortage determination method concerning a prior art. It is explanatory drawing which shows typically an example of the electric shortage determination method in the navigation apparatus. It is explanatory drawing which shows typically the other example of the electric shortage determination method in the navigation apparatus. It is explanatory drawing which shows the outline | summary of a power consumption measurement mode. In the graph of FIG. 5, the vertical axis represents the vehicle speed, and the horizontal axis represents time. 5 is a flowchart showing a procedure of navigation processing by the navigation device 100.

  Exemplary embodiments of a navigation device according to the present invention will be explained below in detail with reference to the accompanying drawings.

(Embodiment)
(Hardware configuration of navigation device)
FIG. 1 is a block diagram of a hardware configuration of the navigation device according to the embodiment. A navigation device 100 according to an embodiment is mounted on an electric vehicle that travels using electric power stored in a power storage device (battery), and includes a CPU 101, a ROM 102, a RAM 103, a recording media drive 104, a recording media 105, and an audio I / F 106. , Microphone 107, speaker 108, input device 109, video I / F 110, display 111, communication I / F 112, GPS unit 113, and vehicle information I / F 114. Each component 101 to 114 is connected by a bus 120.

  The CPU 101 governs overall control of the navigation device 100. The ROM 102 stores various programs such as a boot program, a route search program, a route guidance program, a current location calculation program, and a power failure determination program. The RAM 103 is used as a work area for the CPU 101.

  The recording medium drive 104 controls reading / writing of data with respect to the recording medium 105 according to the control of the CPU 101. The recording medium 105 is a recording medium from / to which data is read / written according to the control of the recording medium drive 104. The recording medium 105 records map data used for route guidance and route search. As the recording medium 105, for example, an HD (hard disk), a DVD, a memory card, or the like can be used.

  The audio I / F 106 is connected to the microphone 107 and the speaker 108 and controls input / output of audio. The microphone 107 collects voice spoken by the user and converts it into voice data. The speaker 108 outputs audio contents such as route guidance audio and music. The input device 109 is a remote controller having a plurality of keys for inputting characters, numerical values, various instructions, etc., a touch panel, operation buttons, and the like. Further, as the input device 109, a microphone 107 that collects a user operation instruction voice may be used.

  The video I / F 110 is connected to the display 111 and controls image display on the display 111. In addition to the map data around the vehicle, the display 111 displays various data such as icons, cursors, menus, windows, characters and images. The map data displayed on the display 111 can be displayed with a mark representing the current location of the vehicle on which the navigation device 100 is mounted.

  The communication I / F 112 is connected to a network via wireless and functions as an interface between the network and the CPU 101. The GPS unit 113 receives radio waves from GPS satellites and outputs information indicating the current location of the vehicle. The output information from the GPS unit 113 is used when the CPU 101 calculates the current location of the vehicle together with output information from the vehicle information I / F 114 described later.

  As the vehicle information I / F 114, vehicle information indicating the state of the vehicle is input from the vehicle main body. The vehicle information is, for example, battery remaining power information, vehicle speed information, acceleration information, and the like. Information obtained from the vehicle information I / F 114 is used for an electric shortage determination process, a route search process, and the like in the navigation device 100.

(Outline of power loss determination processing by the navigation device 100)
The navigation device 100 searches for a route to a destination point set by the user, presents the route, and outputs guidance information at each point (for example, “turn right 300 m”) while the vehicle is traveling. Thus, the vehicle can reach the destination point. Here, the vehicle on which the navigation device 100 is mounted is an electric vehicle that uses electric power as a power source, and needs to travel while securing the necessary electric power to the destination. Specifically, for example, when the destination point is set, the remaining power amount information of the vehicle is acquired, it is determined whether there is enough power to reach the destination point, and there is enough power to reach the destination point. If not, there is a method of charging by setting a charging facility in the middle of the route as a stopover point.

  However, since the cruising distance of the electric vehicle varies depending on the vehicle load (for example, running resistance, the operating state of the air conditioner, etc.), there is a possibility of power shortage (electric shortage) to the initially set destination point. . For this reason, the navigation device 100 determines whether or not the vehicle can travel to the destination using the remaining power in the battery at any time while the vehicle is traveling, that is, whether or not the vehicle is in an electric shortage state. In this case, a route is searched for using the remaining power as a new destination point in the charging facility located in the range where the vehicle can travel (reroute).

  Here, in the prior art, the lack of electricity is determined using the ideal value of the cruising distance from the past average power consumption value of the vehicle and the remaining power amount. In the following description, the cruising range calculated using the past average electricity cost value is referred to as “cruising range”.

  FIG. 2 is an explanatory view schematically showing a method for determining lack of electric power according to the prior art. In the graph of FIG. 2, the vertical axis is the cruising distance, and the horizontal axis is the actual travel distance. In the graph of FIG. 2, the solid line is the actual cruising distance value, the broken line is the ideal cruising distance value at point A, and the two-dot broken line is the ideal cruising distance value at point B. Here, the ideal value indicates a state in which the electric power corresponding to 1 km of the average power consumption value decreases every time the vehicle travels 1 km.

  When the vehicle starts traveling to a destination point at a distance X, the cruising distance value indicated by the solid line decreases. The cruising range (past average power consumption value × residual power amount) is calculated at point A, and the ideal value is shown on the graph as shown by a broken line. Thereafter, the vehicle travels continuously, the cruising distance is calculated at the point B, and the ideal value is shown on the graph as a two-dot broken line. As described above, the cruising distance calculated by the method according to the prior art varies depending on the calculation point.

  Here, when it is determined that the power shortage state occurs when the actual cruising distance falls below a predetermined value from the cruising ideal value, depending on which point the cruising distance ideal value calculated at which point is used, The timing to be judged is different. For example, when it is determined that an electric shortage occurs when the actual cruising distance falls below the ideal cruising value by an arrow Y or more, it is determined that an electric shortage occurs at point B ′ using the cruising distance value at point B. On the other hand, if the ideal value for the cruising distance at the point A is used, it is determined that the terminal A ′ is in an electric shortage state. If it is determined that there is a power shortage immediately before the destination point, such as the point A ', and the actual cruising distance is considerably reduced, it is difficult to take measures to avoid the power shortage.

  For this reason, in the navigation apparatus 100 according to the present embodiment, in place of the cruising distance ideal value, the power loss state is calculated by using the mode-converted cruising distance calculated from the electricity cost value (mode electricity cost value) at the time of mode traveling of the vehicle. Judge whether or not. Since the mode power consumption value of the vehicle is a unique value, it can be compared regardless of the calculation timing of the cruising distance, and it can be detected that the power consumption state is significantly worse than when driving in the mode, It is possible to make an electric shortage determination with higher accuracy. In the following description, the cruising range calculated using the mode power consumption value of the vehicle is referred to as “mode-converted cruising range”.

FIG. 3 is an explanatory view schematically showing an example of the lack of charge determination method in the navigation device 100. In the graph of FIG. 3, the vertical axis represents the cruising distance, and the horizontal axis represents the actual travel distance. In the graph of FIG. 3, the solid line is the actual cruising distance value, and the one-dot broken line is the mode-converted cruising distance value. In the navigation device 100, information on the remaining electric energy is acquired at any time while the vehicle is traveling, and the mode-converted cruising distance is calculated by the following equation (1).
Mode conversion cruising distance (km) = remaining power (kWh) ÷ mode electricity cost (kWh / km) (1)

In addition, the navigation device 100 calculates a cruising distance estimation value represented by the following formula (2) based on a change in cruising distance from the start of travel to the present. The cruising range estimated value is a value for estimating the variation of the cruising range in future travel. In the following formula (2), the unit distance is 1 km. That is, the cruising range is sampled every 1 km and used to calculate the cruising range estimate.
Estimated cruising distance (km) = cruising distance (km) / fluctuation value of cruising distance per unit distance fluctuation value of cruising distance per unit distance = previous cruising distance (km)-cruising distance this time Value (km) ... (2)

  If the actual cruising distance is less than the arrow Y from the mode-converted cruising distance and the estimated cruising distance is smaller than the distance from the current location to the destination, it is not possible to reach the destination with the remaining power alone. Since it is highly possible, it is determined that the terminal will be out of charge. That is, in the example of FIG. 3, when the destination is at the point X1, the estimated cruising distance is larger than the distance from the current location to the destination, so that it is not determined that there is an electric shortage. On the other hand, when the destination is at the point of X2, it is determined that the estimated cruising distance is smaller than the distance from the current location to the destination, so that an electric shortage state is caused.

  FIG. 4 is an explanatory view schematically showing another example of the lack of charge determination method in the navigation device 100. Also in the graph of FIG. 4, as in FIG. 3, the vertical axis is the cruising distance, the horizontal axis is the actual traveling distance, the solid line is the actual cruising distance value, and the dashed line is the mode-converted cruising distance value. As shown in FIG. 4, when the actual cruising distance value and the mode-converted cruising distance value are moving substantially the same, the method as shown in FIG. However, it will not be possible to determine that there will be a lack of electricity.

  For this reason, the navigation device 100 determines that the vehicle is out of charge and cannot travel to the destination point in the following cases, and performs reroute. Note that the “predetermined value” in the following description is a different value, and is set according to the vehicle load such as the power consumption characteristics of the vehicle and the operating state of the air conditioner. Further, for example, the predetermined value may be set according to the number of charging facilities around the route.

1. When the value obtained by subtracting the mode conversion cruising distance from the remaining travel distance between the current location of the vehicle and the destination location is greater than or equal to a predetermined value (> 0) (when the destination location is not clearly reached only by the remaining power)
2. When the value obtained by subtracting the mode converted cruising distance from the remaining mileage is 0 or more and the fluctuation rate of the mode converted cruising distance is less than the predetermined value (when the rate of decrease in the remaining electric energy is large)
3. When the value obtained by subtracting the cruising distance from the mode converted cruising distance is equal to or greater than the predetermined value and the value obtained by subtracting the remaining cruising distance from the estimated cruising distance is less than or equal to 0 (in mode driving and actual driving conditions) Is significantly different)
4). When the value obtained by subtracting the fluctuation rate of the cruising range from the fluctuation rate of the mode converted cruising range is equal to or greater than a predetermined value and the value obtained by subtracting the remaining mileage from the estimated cruising range is 0 or less If it gets worse)

  The fluctuation rate of the mode-converted cruising distance is calculated by subtracting the previously calculated mode-convertible cruising distance from the previously calculated mode-convertible cruising distance, and dividing each mode-convertible cruising distance by the time interval of the calculation timing. To calculate. Further, the fluctuation rate of the cruising range is calculated by subtracting the cruising range by the time interval of the calculation timing, which is obtained by subtracting the previously calculated mode conversion range from the mode conversion range that was calculated this time.

The above-mentioned mode power consumption value is a required electric energy per unit travel distance measured for evaluating the travel performance of the vehicle, and is synonymous with “mode fuel consumption” in a gasoline automobile. The mode power consumption of a general automobile (passenger car) is represented by the power consumption measured in the 10.15 mode or the JC08 mode shown in FIG. Further, the mode is not limited to the 10/15 mode JC08 mode, but is a traveling mode for measuring power consumption.
FIG. 5 is an explanatory diagram showing an outline of the power consumption measurement mode. In the graph of FIG. 5, the vertical axis represents the vehicle speed, and the horizontal axis represents time. FIG. 5A shows the 10.15 mode, and FIG. 5B shows the JC08 mode. The mode power consumption value is a travelable distance per unit electric energy calculated by traveling under traveling conditions as shown in FIG. The navigation device 100 stores the mode power consumption value of the vehicle provided from the vehicle distributor and uses it for the power shortage determination process.

(Navigation processing by the navigation device 100)
Next, a series of navigation processing procedures including an electric shortage determination process by the navigation device 100 will be described.
FIG. 6 is a flowchart showing a procedure of navigation processing by the navigation device 100. The processing in FIG. 6 is performed by the CPU 101 executing a predetermined program using various data recorded in the ROM 102, the RAM 103, the recording medium 105, etc. shown in FIG. Executed. In FIG. 6, for convenience of description, the “mode-converted cruising distance” is “mode cruising distance”.

  In the flowchart of FIG. 6, the navigation device 100 first waits until a destination point is set by the user (step S <b> 601: No loop). When the destination point is set (step S601: Yes), the navigation device 100 searches for a route to the destination point (step S602) and presents the searched route to the user (step S603). The user confirms the presented route and starts traveling of the vehicle. At this time, if the power that can reach the destination point is clearly insufficient, a charging facility on the way may be set as a stop point and charging may be performed.

  The navigation device 100 outputs the guidance information along the route searched in step S602, and acquires the remaining power amount information in the battery via the vehicle information I / F 114 (step S604). Next, the navigation apparatus 100 calculates the cruising range from the past average power consumption value and the remaining power amount of the vehicle (step S605). In addition, the navigation device 100 calculates a mode-converted cruising distance from the mode power consumption value of the vehicle and the remaining power amount (step S606). Further, the navigation device 100 calculates the remaining travel distance that is the distance between the current point of the vehicle and the destination point (step S607), and the cruising range calculated in step S605 and the cruising range per unit distance. The estimated cruising distance is calculated using the fluctuation value (step S608).

  Subsequently, the navigation device 100 subtracts the mode-converted cruising distance from the remaining travel distance, and determines whether or not the value is equal to or greater than a predetermined value (> 0) (step S609). If the value obtained by subtracting the mode conversion cruising distance from the remaining travel distance is equal to or greater than the predetermined value (step S609: Yes), it is clearly not possible to reach the destination point only with the remaining power amount, and there is a high possibility of electric shortage. The process proceeds to step S616.

  On the other hand, if the value obtained by subtracting the mode converted cruising distance from the remaining travel distance is less than the predetermined value (step S609: No), whether or not the value obtained by subtracting the mode converted cruising distance from the remaining travel distance is 0 or more. Judgment is made (step S610). When the value obtained by subtracting the mode conversion cruising distance from the remaining travel distance is less than 0 (step S610: No), the process proceeds to step S612.

  On the other hand, when the value obtained by subtracting the mode conversion cruising distance from the remaining travel distance is 0 or more (step S610: Yes), it is determined whether or not the rate of change of the mode conversion cruising distance is equal to or less than a predetermined value (step). S611). If the change rate of the mode-convertable cruising distance is equal to or less than the predetermined value (step S611: Yes), the process proceeds to step S616, assuming that the reduction rate of the remaining power amount is large and there is a high possibility of electric shortage.

  On the other hand, if the change rate of the mode-convertable cruising distance is greater than a predetermined value (step S611: No), whether or not the value obtained by subtracting the remaining cruising distance from the estimated cruising distance calculated in step S608 is 0 or less. Judgment is made (step S612). When the value obtained by subtracting the remaining travel distance from the estimated cruising distance is larger than 0 (step S612: No), the process proceeds to step S615.

  On the other hand, if the value obtained by subtracting the remaining travel distance from the estimated cruising distance is 0 or less (step S612: Yes), whether or not the value obtained by subtracting the cruising distance from the mode-converted cruising distance is equal to or greater than a predetermined value. Is determined (step S613). If the value obtained by subtracting the cruising distance from the mode converted cruising distance is greater than or equal to a predetermined value (step S613: Yes), the actual driving state is significantly different from the mode driving, and there is a possibility of electric shortage. As high, the process proceeds to step S616.

  On the other hand, when the value obtained by subtracting the cruising distance from the mode converted cruising distance is less than the predetermined value (step S613: No), the value obtained by subtracting the cruising distance variation rate from the mode converted cruising distance variation rate is predetermined. It is determined whether or not the value is greater than or equal to the value (step S614). When the value obtained by subtracting the fluctuation rate of the cruising range from the fluctuation rate of the mode converted cruising range is equal to or greater than a predetermined value (step S614: Yes), the power consumption is remarkably deteriorated and there is a high possibility of being short of electricity. Then, the process proceeds to step S616.

  On the other hand, if the value obtained by subtracting the variation rate of the cruising range from the variation rate of the mode-convertable cruising range is less than a predetermined value (step S614: No), it is assumed that there is a low possibility of electric shortage at the present time. Each calculated value calculated in S608 is recorded (step S615).

  In addition, when it is determined in steps S609, S611, S613, and S614 that there is a high possibility of electric shortage, the navigation device 100 displays on the display 111 and the like that there is a high possibility of electric shortage and Alternatively, the route is searched again using the charging facility in the vicinity of the route searched in step S602 as a stopover point (step S616). The navigation apparatus 100 presents the re-searched route and confirms whether or not to approve the reroute to the user (step S615). When the reroute is approved (step S617: Yes), route guidance is performed along the route after the reroute (step S618). On the other hand, when the reroute is not approved (step S617: No), the process proceeds to step S619.

  The navigation device 100 returns to step S604 until the vehicle reaches the destination point (step S619: No), and repeats the subsequent processing. And if a vehicle arrives at the destination point (step S619: Yes), the process by this flowchart will be complete | finished.

  As described above, the navigation device 100 according to the embodiment determines whether or not the vehicle can travel to the destination using the remaining power in the vehicle battery based on the remaining energy information of the vehicle and the mode power consumption value. If it is determined that it is determined that the vehicle cannot travel to the destination point, the route that uses the remaining power as a new destination point is searched for the charging facility located in the range where the vehicle can travel. Since the mode electricity cost value is always a constant value unlike the past average electricity cost value, it is possible to accurately determine the lack of electricity regardless of the calculation timing of the cruising range. Further, it is possible to detect that the power consumption state is remarkably worse than that in the mode running. Furthermore, when it is determined that there is a shortage of electricity, the reroute is performed so as to stop at the charging facility on the way, so that it is possible to prevent the remaining power from running out and becoming unable to travel.

  Further, when the value obtained by subtracting the mode conversion cruising distance from the remaining travel distance is equal to or greater than a predetermined value, the navigation device 100 determines that the vehicle cannot travel to the destination point, so that the remaining power for traveling the remaining travel distance is sufficient. When it is not clear, it is possible to stop at another charging facility and perform charging, and it is possible to prevent the remaining power from running out and being unable to run.

  Further, the navigation device 100 cannot travel to the destination when the value obtained by subtracting the mode-converted cruising distance from the remaining travel distance is 0 or more and the variation rate of the mode-converted cruising distance is a predetermined value or less. Judge. As a result, even if the cruising range is somewhat increased due to power generation due to regenerative power, etc., there is a high possibility that it will not be possible to reach the destination point. It is possible to prevent the vehicle from running. Further, the navigation device 100 calculates the mode conversion cruising distance by calculating the mode conversion cruising distance by subtracting the previously calculated mode conversion cruising distance from the mode conversion cruising distance calculated this time. Calculate by dividing by the time interval. By calculating the change rate of the mode-converted cruising distance, it is possible to detect that the remaining power amount has fluctuated rapidly due to, for example, a change in the vehicle weight or a change in the operating state of the air conditioner.

  In addition, the navigation device 100 calculates a mode-convertable cruising distance, calculates a cruising distance based on a past average power consumption value, and a value obtained by subtracting the cruising distance from the mode-converted cruising distance is a predetermined value or more. In this case, it is determined that the vehicle cannot travel to the destination point. Since the cruising distance based on the past average electricity cost value reflects the current road condition and vehicle condition, it is possible to more reliably determine whether or not power is missing.

  In addition, the navigation device 100 determines that the vehicle cannot travel to the destination when the value obtained by subtracting the fluctuation rate of the cruising distance from the fluctuation rate of the mode-convertable cruising distance is equal to or greater than a predetermined value. Thereby, even when the value obtained by subtracting the cruising range from the mode-converted cruising range is less than the predetermined value, the reroute can be performed if there is a possibility of electric shortage. In addition, since the navigation device 100 calculates the mode-converted cruising range and the fluctuation rate of the cruising range, it is possible to accurately detect changes in the remaining power amount and the power consumption.

  DESCRIPTION OF SYMBOLS 100 ... Navigation apparatus, 101 ... CPU, 102 ... ROM, 103 ... RAM, 104 ... Recording media drive, 105 ... Recording media, 106 ... Voice I / F, 107 ... Microphone, 108 ... Speakers 109 ... Input devices 110 ... Video I / F, 111 ... Display, 112 ... Communication I / F, 113 GPS unit, 114 ... Vehicle information I / F

Claims (6)

A navigation device mounted on an electric vehicle that travels using electric power stored in a power storage device,
Search means for searching for a route to the destination point;
Remaining power amount information acquiring means for acquiring remaining power amount information of the power storage device during guidance of the route searched by the searching means;
Based on the remaining power amount information acquired by the remaining power amount information acquisition means and the mode power cost value of the electric vehicle, the electric vehicle can travel to the destination using the remaining power in the power storage device. Determination means for determining whether or not,
The determination means calculates the mode-converted cruising distance of the electric vehicle by dividing the remaining electric energy in the power storage device by the mode power consumption value, and the remaining between the current point of the electric vehicle and the destination point When the value obtained by subtracting the mode-converted cruising distance from the travel distance is 0 or more and the variation rate of the mode-convertible cruising distance is a predetermined value or less, the electric vehicle cannot travel to the destination point Judgment
When the determination means determines that the electric vehicle cannot travel to the destination, the search means searches for a route that uses the remaining power as a new destination for a charging facility located in a range where the electric vehicle can travel The navigation apparatus characterized by doing. The determination means calculates the change rate of the mode-converted cruising distance by subtracting the mode-converted cruising distance previously calculated from the mode-converted cruising distance calculated this time, and calculates the mode-converted cruising distance as the mode-convertable cruising distance. The navigation device according to claim 1 , wherein the calculation is performed by dividing by a time interval of calculation timing. The determination means calculates the mode-converted cruising distance of the electric vehicle by dividing the remaining electric energy in the power storage device by the mode power consumption value, and the remaining between the current point of the electric vehicle and the destination point 3. The navigation according to claim 1, wherein the electric vehicle is determined to be unable to travel to the destination point even when a value obtained by subtracting the mode conversion cruising distance from a travel distance is a predetermined value or more. apparatus. The determining means divides the remaining power amount in the power storage device by the mode power cost value to calculate a mode conversion cruising distance of the electric vehicle, and calculates the remaining power amount in the power storage device in the past of the electric vehicle. The cruising distance of the electric vehicle is calculated by dividing by the average power cost value of the vehicle, and the value obtained by subtracting the cruising distance from the mode-converted cruising distance is a predetermined value or more, and the cruising distance per unit travel distance also in the case of the following distance value to the destination cruising distance estimation value estimated from the current position from the change of claims 1 to 3, wherein the electric vehicle is characterized in that it determines that it can not travel up the destination point The navigation device according to any one of the above. The determining means divides the remaining power amount in the power storage device by the mode power cost value to calculate a mode conversion cruising distance of the electric vehicle, and calculates the remaining power amount in the power storage device in the past of the electric vehicle. Calculated by subtracting the average electric cost value of the electric vehicle, and a value obtained by subtracting the fluctuation rate of the cruising distance from the fluctuation rate of the mode-converted cruising distance is a predetermined value or more, and It is determined that the electric vehicle cannot travel to the destination even when the estimated cruising distance estimated from the variation in the cruising distance per unit mileage is equal to or less than the distance from the current location to the destination. The navigation device according to any one of claims 1 to 4 . The determination means calculates the change rate of the mode-converted cruising distance by subtracting the mode-converted cruising distance previously calculated from the mode-converted cruising distance calculated this time, and calculates the mode-converted cruising distance as the mode-convertable cruising distance. Calculated by dividing by the time interval of the calculation timing, and the variation rate of the cruising range is calculated by subtracting the cruising range calculated last time from the cruising range calculated this time. The navigation apparatus according to claim 5 , wherein the calculation is performed by dividing by a time interval of calculation timing.

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