JP2018072213A - Portable terminal device, and portable terminal program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable smaller power consumption to guide travelling routes over a more prolonged time.SOLUTION: When a current location reaches a switch point, a guide screen is switched from a power saving mode (screen OFF) to a normal mode (screen ON), and the guide screen is switched again to the power saving mode again after a passage through a guide point. The switch points R and F are not set at a fixed distance, and are set so that a sum of both total power consumption of the normal mode and the power saving mode is equal to or less than usable power Clim based on a residual capacity of a battery. More specifically, according to the number of guide points, the Clim, and a reference speed V, the more the number of guide points are, and the less the Clim is, a distance between the switch points R and F is set shorter, which in turn the guide within the residual capacity of the buttery is achieved. During the guidance of routes, when a vehicle speed v upon actually reaching the switch point R is later than the reference speed V, the switch point R is switched to a switch point r closer to the guide point P. By changing to the switch point r in conformity with the actual vehicle speed v, unexpected power consumption can be held down, which in turn a more prolonged travelling guide can be realized.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a mobile terminal device and a mobile terminal program, for example, to a technique for obtaining and guiding a travel route to a destination.

2. Description of the Related Art Navigation technology that guides a driving route to a destination for a vehicle driver or the like is widely used. Recently, not only a navigation device mounted on a vehicle but also a technology for guiding using a portable terminal such as a smart phone that can be carried for simple guidance has been put into practical use.
In the case of a guide device using this portable terminal, there is a problem that the battery is small compared to the in-vehicle device.
Therefore, there are cases where guidance is provided while charging the mobile terminal using the power source of the vehicle, but if there is no charging cable or the vehicle cannot be charged like a rental car, the power is turned off during the guidance. There was a possibility.
On the other hand, in an apparatus in which the screen display is turned off and guidance is performed only by voice, the power consumption used for guidance can be reduced. However, since it is only voice guidance, convenience has been lowered, for example, it is impossible to confirm the guidance screen at a confusing branch, and the user erroneously passes the intersection.

On the other hand, Patent Document 1 proposes a technique for guiding an easy guidance section in which a route is easily grasped in a power saving mode and switching to a normal mode when reaching a threshold distance before the easy guidance section ends. Yes.
However, since the threshold distance (fixed value) before the guide point is defined as a point for switching from the power saving mode to the normal mode, the power consumption has not necessarily been reduced sufficiently. For this reason, there was a high possibility that the battery would run out before reaching the destination.
Even if guidance to the destination is possible, there is a higher possibility that it will not be possible to provide guidance for return if charging is not possible.
Furthermore, the mode is switched to the normal mode before a predetermined threshold distance, and the traveling speed of the vehicle is not taken into consideration. For this reason, when the vehicle is traveling at a low speed due to a traffic jam or the like, there is a problem that the time until the vehicle passes through the guide point becomes longer, and the power consumption in the normal mode increases more than planned.

JP 2014-202490 A

  An object of the present invention is to make it possible to guide a travel route for a longer time with less power consumption.

(1) In the invention according to claim 1, route acquisition means for acquiring a travel route from a predetermined departure place to a destination, a guide point existing on the travel route is acquired, and a guide screen for the guide point is obtained. Guidance means for displaying, usable power acquisition means for acquiring available power based on the remaining capacity of the battery mounted on the portable terminal, normal mode for displaying the guidance screen before and after the guidance point, and saving Switching point determination means for determining a switching point for switching between the power modes, current position acquisition means for acquiring the current position of the mobile terminal, and when the current position becomes the determined switching point, the normal mode is omitted. Mode switching means for switching the power mode, power consumption in the normal mode, power consumption acquisition means for acquiring power consumption in the power saving mode, and the switching point determination means, Determining a switching point for the guide point so that the sum of the total power consumption in all sections traveling in the normal mode and the total power consumption in all sections traveling in the power saving mode is equal to or less than the usable power. A portable terminal device is provided.
(2) In the invention described in claim 2, the switching point determination means further determines a switching point according to the number of the acquired guidance points. The portable terminal device according to claim 1, I will provide a.
(3) In the invention according to claim 3, the switching point determination means switches from the power saving mode to the normal mode before the guidance point, and switches from the normal mode to the power saving mode after passing through the guidance point. The point is determined, and the mobile terminal device according to claim 1 or claim 2 is provided.
(4) The invention according to claim 4, further comprising vehicle speed acquisition means for acquiring a reference speed V determined corresponding to each road constituting the acquired travel route, wherein the switching point determination means includes: The total power consumption is calculated based on the distance of all sections traveling in the normal mode and the reference speed V in the section, and on the distance of all sections traveling in the power saving mode and the reference speed V in the section. The portable terminal device according to claim 1, 2, or 3 is provided.
(5) The invention according to claim 5, further comprising a current vehicle speed acquisition unit that acquires a current vehicle speed v of the vehicle, and a switching point change unit that changes the switching point according to the acquired current vehicle speed v, The switching point changing means changes the switching point to the corresponding guidance point side when the current vehicle speed v at the switching point is less than the reference speed V corresponding to the road of the switching point. A portable terminal device according to claim 4 is provided.
(6) In the invention according to claim 6, the chargeability determination means for determining whether or not charging is possible at the destination and the usable power acquisition means are usable when charging is possible at the destination. The portable terminal device according to any one of claims 1 to 5, wherein the usable power when charging is not possible is halved with respect to the power.
(7) In the invention according to claim 7, in the power saving mode, the display of the guidance screen is turned off. The invention according to any one of claims 1 to 6, The portable terminal device described is provided.
(8) In the invention according to claim 8, the computer acquires a route acquisition function for acquiring a travel route from a predetermined departure point to a destination, acquires a guide point existing on the travel route, A guidance function for displaying a guidance screen, a usable power acquisition function for obtaining usable power based on the remaining capacity of a battery mounted on a portable terminal, a normal mode for displaying the guidance screen before and after the guidance point, and saving A switching point determination function for determining a switching point for switching between the power modes, a current position acquisition function for acquiring a current position of the mobile terminal, and a normal mode and a power saving mode when the current position becomes the determined switching point A mobile terminal that realizes a mode switching function for switching between power consumption, a power consumption acquisition function for acquiring power consumption in the normal mode, and power consumption in the power saving mode In the program, the switching point determination function is configured so that a total of total power consumption in all sections traveling in the normal mode and total power consumption in all sections traveling in the power saving mode is equal to or less than the usable power. A portable terminal program characterized by determining a switching point for a guide point is provided.

  According to the present invention, the total power consumption in all sections running in the normal mode and the total power consumption in all sections running in the power saving mode can be used as the switching point for switching between the normal mode and the power saving mode. Since the power is determined to be equal to or lower than the power, the travel route can be guided for a longer time with less power consumption.

It is a figure showing the external appearance structure of the portable terminal device. It is a block diagram of a portable terminal device. It is explanatory drawing showing the mode switching point on a driving | running route, and a display screen. It is a flowchart of a travel route guidance process. It is a flowchart showing the subroutine of the switching point change process by vehicle speed.

Hereinafter, preferred embodiments of the portable terminal device and the portable terminal program of the present invention will be described in detail with reference to FIGS. 1 to 5.
(1) Outline of Embodiment In the mobile terminal device of the present embodiment, when the current position reaches the switching point, the power saving mode (screen off) is switched to the normal mode (screen on), and the power saving mode is resumed after passing through the guidance point. Switch to. The switching point is not set by a fixed distance, but the total of the total power consumption in all sections traveling in the normal mode and the total power consumption in all sections traveling in the power saving mode is mounted on the mobile terminal device 1. Is set to be equal to or less than the usable power Clim based on the remaining capacity of the battery.
Specifically, based on the number of guide points, usable power Clim, and reference speed V, the greater the number of guide points, the smaller the usable power Clim, and the slower the reference speed V, the more the guide point to the switching point. By setting the switching point so as to shorten the distance, guidance within the remaining battery level is realized.

The position of the switching point is set to the front by the distance R obtained from the guidance time in the normal mode assigned to one guidance point and the reference speed V at the switching point.
Then, during the travel route guidance, the actual vehicle speed (moving speed) v at the switching point is acquired, and when the vehicle speed v is less than the reference speed V, the switching point is determined according to the vehicle speed v (for example, r = {(R−w) × (v / V)} − w), the switching timing to the normal mode is delayed. As a result, for example, even when the vehicle is traveling at a low speed due to traffic jams or the like, it is avoided that the normal mode is set for a longer time than the guidance time assigned to the guidance point, resulting in unexpected power consumption. It is possible to suppress the travel guidance for a longer distance.

(2) Details of Embodiment FIG. 1 is an external configuration diagram of a mobile terminal device 1 to which the present embodiment is applied.
As shown in FIG. 1, as the mobile terminal device 1, various portable electronic devices having a display screen such as a smart phone, a tablet, and a game device are used.
The mobile terminal device 1 has a battery 17 disposed therein, and with the power from the battery 17, driving route guidance according to the present embodiment, and other processes unique to various terminals (calling, TV reception, games, etc.) Process).
The mobile terminal device 1 includes a display 121 on which various operation screens and images are displayed, and a touch panel 131 disposed on the display 121. In the present embodiment, the route to the destination is switched appropriately between the normal mode in which the current position and the travel route are displayed on the display 121 and the power saving mode in which the screen display is turned off in order to suppress power consumption due to the screen display. invite.
In the present embodiment, a case is described in which a travel route is guided for an automobile, but another vehicle such as a motorcycle or a bicycle may be used, and guidance may be performed for a pedestrian.

FIG. 2 is an explanatory diagram conceptually showing the internal configuration of the mobile terminal device 1.
As shown in FIG. 2, the mobile terminal device 1 includes a control unit 11, an output unit 12, an input unit 13, a GPS receiver 14, a storage unit 15, a communication control unit 16, and a battery 17.

The control unit 11 includes a CPU, a ROM, and a RAM (not shown), and controls each unit. The telephone unit performs call processing, music and image reproduction processing, and travel route search processing to a destination in the present embodiment. Various processes such as a travel route guidance process are performed.
The CPU executes various programs such as a call process and a travel route guidance process by executing various programs stored in the ROM or the storage unit 15. The ROM is a read-only memory in which programs and data for performing basic control of the mobile terminal device 1 are stored.
The RAM is a random access memory that the CPU uses as a working memory. In this RAM, various data such as the travel route search process of the present embodiment and the travel route to the destination acquired from the outside via the communication control unit 16, the data of the switching point set in the travel route guidance process, and Various areas for temporarily storing intermediate data obtained at the stage of acquiring these can be secured.

The output unit 12 includes a display 121 and a speaker 122 that outputs sound as various devices that function as output means.
As the display 121, a liquid crystal display is mainly used, but other display devices may be used. The display 121 displays a soft keyboard and a numeric keypad, input items, an input frame, and the like, and an input result corresponding to the operation. For example, various input screens necessary for the travel route search process of the present embodiment are displayed on the display 121, and in the travel route guidance process, images such as the travel route and the current position are displayed according to each set switching point. Or the screen display turns off (power saving mode).
The speaker 122 is a device that outputs various sounds such as voice. For example, a voice for guiding the guidance point by voice such as “the intersection at XXm is in the right direction” is output. In the call process, sound received from the caller is output, and in the game process, sound effects are output.

The input unit 13 includes a touch panel 131 and other input devices 132 as various devices that function as input means.
The touch panel 131 is an input device arranged on the surface of the display 121, specifies a user's touch position corresponding to various operation keys displayed on the screen of the display 121, and an operation key displayed corresponding to the touch position. Accepts input.
The other input device 132 includes a power button of the mobile terminal device 1, a volume adjustment button, and a microphone. The microphone is used for a call function and is used for inputting a voice to be recognized when a voice recognition function is provided.

The GPS receiver 14 receives signals from a plurality of GPS satellites. The GPS receiver 14 acquires various information such as the current position (position information), the moving speed, and the traveling direction of the mobile terminal device 1 based on the received signal from GPS hygiene and supplies the acquired information to the control unit 11.
The mobile terminal device 1 further includes an acceleration sensor, an angular velocity sensor, a distance sensor, and the like as a device for correcting the current position acquired by the GPS receiver 14 or acquiring the current position independently. Also good.

The storage device 15 is a readable / writable storage medium, and a semiconductor memory is mainly used, but a hard disk may be used depending on the device.
The storage unit 15 includes an application storage unit 151, a travel route related information storage unit 152, a reference speed V storage unit 153, a map information storage unit 154, a power consumption storage unit 155, and other storage units.
In the application storage unit 151, in order to realize various functions of the mobile terminal device 1 in addition to a program for performing battery remaining amount acquisition processing, route search processing, travel route guidance processing, and battery remaining amount acquisition program in the present embodiment. The application program (application) is stored. The battery remaining amount acquisition program is a program for acquiring the battery remaining amount from the measured value of the voltage of the battery 17 and the discharge amount calculated by integrating the discharge current value over time.

The travel route related information storage unit 152 stores travel route related information such as travel route information from the departure point to the destination and guidance information necessary for guidance of the travel route. This travel route related information is stored so that guidance from the same position can be resumed even when the travel route guidance is interrupted due to the end of the application or power off. Therefore, it is normally stored in the RAM, and may be stored in the storage unit 15 when the application ends or the power is turned off.
The travel route related information is acquired when the control unit 11 executes the route search processing application stored in the application storage unit 151, and the travel route related information searched by the navigation server or the personal computer. 16 may be obtained from the outside via the terminal 16. In the latter case, the acquisition method is mainly for the mobile terminal device 1 that does not have a route search processing application and does not have a route search function, but even with the mobile terminal device 1 that has a route search function, When the area of information stored in the map information storage unit 154 is limited to the Kanto region, the Kinki region, or the like, it is used when searching for a route including other regions. When acquiring the travel route related information from the outside, the control unit 11 transmits the departure place and the destination to a server or the like.
The starting location used in the route search uses the current location of the vehicle (portable terminal device 1), but a specific location (for example, a meeting location) different from the current location can be set as the departure location. When a point other than the current position is set as the departure point, the departure point input by the user's input operation is used.

The reference speed V storage unit 153 stores a reference speed (using legal speed in this embodiment) V for each road. This reference speed V is used to calculate the distance from each guide point to the switching point for switching to the normal mode.
The reference speed V stored in the reference speed V storage unit 153 may target all roads, but may store the acquired reference speed V of each road on the travel route. When the travel route related information including the reference speed V is acquired from the outside, or when the map information stored in the map information storage unit 154 includes the reference speed V, it is not necessary to separately store the reference speed V.
In the map information storage unit 154, route search processing such as road information represented by nodes that specify points on the road including the intersections and links connecting the nodes, facility information, enlarged views of the intersections, Map information necessary for the travel route guidance process is stored.

The power consumption amount storage unit 155 includes a normal consumption time Uon (s /%) in which power consumption of 1 (%) is consumed in the normal mode in which the screen display is turned on, and 1 ( %)), The power saving consumption time Uoff (s /%) is stored. The normal consumption time Uon and the power saving consumption time Uoff are times during which the normal mode and the power saving mode can be maintained with 1% power.
The both consumption times Uon and Uoff may be stored in a predetermined prescribed value, or may be calculated by the control unit 11 from the time and power consumption in both modes.
When the control unit 11 calculates, the consumption time Uon and Uoff are calculated by acquiring the remaining battery capacity every predetermined time (for example, 10 seconds). In this case, it is possible to deal with a situation such as a deterioration state of the battery 17, and more accurate normal consumption time Uon and power saving consumption time Uoff can be used, but power is consumed for this calculation. Therefore, when there is sufficient usable power for guiding to the destination, for example, when the power in the normal mode that can be consumed for one guide point calculated from the usable power Clim exceeds a predetermined threshold value, the control is performed. The unit 11 may measure the normal consumption time Uon and the power saving consumption time Uoff, and may use a specified value when it is equal to or less than a threshold value. Instead of the specified value, the previous calculated value may be used by saving the previous calculated value without deleting it.

The communication control unit 16 is a device that connects the control unit 11 and an external server or computer by various wireless communications such as the Internet. The communication control unit 16 is connected to these external devices, and the departure place and purpose input from the input unit 13 Information such as the ground is transmitted or travel route related information is received from an external device.
The communication control unit 16 is also used when the map information 154 and the reference speed V are not stored in the storage unit 15 and are acquired from the outside.
The battery 17 uses various storage batteries such as a lithium battery that can be charged and discharged, and supplies power necessary for various processes of the mobile terminal device 1 to each unit. The remaining capacity (power) of the battery 17 is measured by the control unit 11 according to the battery remaining amount acquisition program.
The other storage unit stores voice data stored when the voice guidance function is installed, telephone number data used in the telephone function, address book, music data, and the like.

Next, the travel route guidance process by the mobile terminal device 1 will be described.
The travel route guidance process of this embodiment is roughly divided into three steps: (a) acquisition of basic information, (b) setting of a switching point between the normal mode and the power saving mode, and (c) travel route guidance. by.

FIG. 3 is an explanatory diagram showing mode switching points on the travel route and a display screen.
(A) Acquisition of basic information In the acquisition of basic information, as shown in FIG. 3A, the available power Clim obtained from the travel route 31 to the destination, the guide point P on the travel route, and the remaining battery level. The normal consumption time Uon, the power saving consumption time Uoff, and the reference speed V of each road on the travel route are acquired in the power saving mode and the normal mode.

(B) Setting of switching points Two switching points are set before and after each guidance point. That is, as shown to Fig.3 (a), the switching point R before the guidance point P and the switching point F after passage are set. The normal mode is between the switching point R and the switching point F, and the section other than the normal mode (up to the switching point R and after the switching point F) is the power saving mode. As will be described later, the switching point r is obtained by correcting the set switching point R in accordance with actual travel.
In setting the switching point, in order to guide to the destination within the available power Clim, the time distribution (Tontotal, Tofftotal) of the power saving mode and normal mode to the destination is calculated, and the reference speed V of each road is used. Then, the switching points R and F for the guide point P are set.

(C) Travel Route Guidance When guiding a travel route, travel route guidance is performed while switching modes at a switching point where guidance in the power saving mode and the normal mode is set.
After passing through the switching point F or after passing through the switching point R, it is a section where the vehicle can travel without hesitation without guidance on the screen, and this section is guided in the power saving mode.
In this power saving mode, power consumption is reduced by turning off the display on the display 121, and as shown in FIG. 3B, voice guidance such as “It is a road” is performed as necessary. This voice guidance is performed, for example, when the time of the power saving mode has exceeded a predetermined threshold in order to prevent the user from becoming anxious about whether the route guidance is provided due to the length of the time of the power saving mode. Is called. However, when the remaining battery level is low, the user may be notified that the sound is not output. Further, whether or not to perform voice guidance is arbitrary, and there are a case where the user makes the selection and a case where the portable terminal device 1 does not include the voice guidance function itself. When the voice guidance function is installed, the voice data is stored as other data (not shown) in the storage unit 15, and when it is not installed, the voice data is unnecessary.

On the other hand, in the section including the guidance point P from the switching point R to the switching point F, guidance in the normal mode is performed.
In this normal mode, in order to guide the user in the direction of travel at the guide point R, as shown in FIG. 3C, a map is displayed on the display 121, and the current position and travel route are displayed. Further, an enlarged view of the guide point P is displayed on the right side of the screen. In addition, the display of an enlarged view is arbitrary. When the enlarged display is not performed, an increase in the data amount of the map information storage unit 154 can be suppressed.
Even in the normal mode, not only the screen display but also a guidance voice such as “Xm ahead, right direction” is output. However, as in the power saving mode, when the remaining battery level is low, the voice output can be omitted, and the voice guidance function itself can be omitted.
Regardless of the presence or absence of the voice guidance function, when switching from the power saving mode to the normal mode, it is preferable to output a notification sound such as a chime sound or a buzzer in order to recognize that the guidance point P is close.

The switching point R is set according to the reference speed V. Therefore, as shown in FIG. 3 (a), the vehicle speed (current vehicle speed) v = 30 (km) between the switching points R to F set assuming the reference speed V = 50 (km / h). / H), the time in the normal mode (power consumption is larger than that in the power saving mode) becomes longer, and the power consumption becomes larger than the assumed value.
Therefore, the vehicle speed v at the time of reaching the switching point R is acquired, and the switching point R is corrected based on the values of the reference speed V and the vehicle speed v. Since it is necessary to determine the correction process, the vehicle speed acquired immediately before reaching the switching point R is used as the vehicle speed v when the switching point R is reached.

In the present embodiment, when the vehicle speed v is equal to or higher than the reference speed V, the power consumption does not exceed the assumed value, so that the guidance point P is guided by switching from the power saving mode to the normal mode at the switching point R.
On the other hand, when the vehicle speed v is less than the reference speed V, the position of the switching point R is corrected to the switching point r shortened to v / V = 30/50, and the mode is switched to the normal mode when the switching point r is reached. To guide the guide point P.
In the present embodiment, the distance between the switching points R and F is corrected to v / V, but the distance from the switching point R to the guidance point P may be corrected to v / V. In addition, both from the switching point R to the guidance point P and from the guidance point P to the switching point F may be corrected to v / V.
In this way, by changing the switching point R to the switching point r in accordance with the actual vehicle speed v, unexpected power consumption can be suppressed, and travel guidance for a longer distance can be performed.

Next, details of the travel route guidance process will be described.
FIG. 4 is a flowchart of the travel route guidance process.
The controller 11 first acquires the travel route 31 to the destination (step 20).
The travel route acquired here (travel route 31 in FIG. 3) is obtained when the travel route to the destination obtained by the travel route search in the own device is obtained, and when obtained from the outside via the communication control unit 16. There is.

Next, the control unit 11 calculates the usable power Clim based on the acquired travel route 31 and stores it in the RAM (step 21).
The available power Clim is the maximum power that can be consumed to guide the travel route to the destination, and is expressed in detail as a percentage (%) of the total power consumption from the fully charged state.
This usable power Clim differs depending on the type of destination. That is, the control unit 11 determines whether or not the mobile terminal device 1 can be charged at the destination, and if it is not possible to charge, it is necessary to consider the power used for the return route guidance. Clim is set to 1/2 of the case where charging is possible.

Specifically, the usable power Clim is calculated from the following equations (1) and (2).
Usable power when charging is not possible Clim = (Bnow · Z) / 2 (1)
Usable power when charging is possible Clim = Bnow · Z (2)
Here, Bnow is the battery remaining amount (%) before starting the guidance of the travel route, and is acquired by the battery remaining amount acquisition program.
Z (%) is electric power used other than the travel route guidance according to the present embodiment and reserve electric power for preventing the battery 17 from being overdischarged, and is set to 10%, for example. However, other values are possible.
The following equation (1-2) may be used instead of equation (1). This formula ensures reserve power for each round trip.
Clim = (Bnow / 2) (1-2)

Next, the control part 11 acquires guidance information, and preserve | saves it at RAM (step 22).
The guide information acquired here is the normal guide point total number Nu (pieces), the special guide point total number NAl (pieces), the total arrival time Tarr (s) to the destination, and the reference speed V (km / h).
When a point where guidance is performed by switching to the normal mode in the travel route 31 is a guide point P (see FIG. 3), the guide point P includes a normal guide point Pu and a special guide point PAl.
The normal guidance point Pu corresponds to a guidance branch point such as an intersection (excluding a road intersection described later).
The special guide point PAl corresponds to a guide point in a road section when a section on the travel route 31 excluding a certain section including the normal guide point Pu is a “road section”.

Then, the control unit 11 acquires from the travel route 31 the total number of normal guide points Pu = the total number of normal guide points Nu and the total number of special guide points PAl = the total number of special guide points NAl.
In this embodiment, when the total distance of all road sections is LAl (km), it is defined that there is one special guide point PAl per 1 km of the road section distance, and the total number of special guide points NAL (= LAL). However, for example, the control unit 11 preliminarily defines points on the road section where it is better to perform screen guidance, for example, tunnel entrances, railroad crossings, road intersections, and the like as special guidance points. The total number of special guide points NAl existing on the section may be counted.
Here, a road intersection means a road which becomes a road depending on the direction of travel and is easy to understand the direction of travel. For example, at the intersection where two roads a and b that intersect at an acute angle merge to form one road c (a road corresponding to a Y-shaped vertical bar), such as a Y-shaped road, An intersection when traveling from road b to road c is called a road intersection. However, when traveling from the road c to the road a or b, or when traveling from the road a to the road b, guidance is required, so the road is not a road intersection but a normal intersection.

In addition, the control unit 11 obtains the total arrival time Tarr required to reach the destination from the distance of the entire travel route 31. When calculating the total arrival time Tarr, the control unit 11 corrects the total distance of the travel route 31 by the normal guide point total number Nu and the special guide point total number NAl and uses the reference speed V. Thus, the total arrival time Tarr can be obtained with high accuracy. That is, it is obtained by calculating the total arrival time Tarr from each reference speed V and the total distance (distance after correction) of the road having the reference speed V existing up to the destination.
On the other hand, the control unit 11 acquires the reference speed V of each road constituting the travel route 31 by reading from the reference speed V storage unit 153.

Next, the control unit 11 obtains consumption times Uon and Uoff of electric power 1 (%) (step 23).
That is, the control unit 11 uses the normal consumption time Uon (s /%) for consuming power 1 (%) in the normal mode and the power saving consumption time Uoff (s /%) for consuming power 1 (%) in the power saving mode. ) Is acquired from the power consumption storage unit 155.

Next, the control unit 11 calculates the total time Tontotal (s) in the normal mode for arriving at the destination within the available power Clim (step 24).
First, since the time required to arrive at the destination acquired in step 22 is the total arrival time Tarr (s), when the total time in the power saving mode is Tofftotal (s), the following equation (3) is established.
Tarr (s) = Tontotal + Tofftotal (3)

In addition, since the time during which the normal mode can be maintained with the power of 1 (%) is the normal consumption time Uon (s /%) acquired in step 23, the total power consumption Contotal (%) consumed in all the normal mode sections is It is represented by the following formula (4).
Contotal = Tontotal / Uon (4)
Similarly, the total power consumption Cofftotal (%) consumed in the entire power saving mode section is expressed by the following equation (5).
Cofftotal = Tofftotal / Uoff (5)

From the above formulas (4) and (5), the usable power Clim (%) that can be consumed in the entire travel route is represented by the following formula (6).
Clim (%) = Contotal + Cofftotal = (Tontotal / Uon) + (Tofftotal / Uoff) (6)

Then, by solving the simultaneous equations of Expression (3) and Expression (6), the total time Tontotal in the normal mode is calculated by the following Expression (7).
Tontotal = (Tarr−Clim × Uoff) / (1−Uoff / Uon) (7)
Note that Tofftotal is obtained from Tontotal and Equation (3).

Next, the control unit 11 determines whether or not the remaining battery capacity is insufficient from the obtained total time Tontotal of the normal mode (step 25).
That is, the control unit 20 determines the total minimum time Tthall of all the normal guide points Pu from the information on the number of normal guide points (total Nu, etc.) and the minimum guide threshold value of the normal guide points Pu among the guide information acquired in Step 22. And whether or not the remaining battery level is insufficient is determined based on whether or not the total minimum time Tthall is less than or equal to the total time Tontotal.
Here, the minimum guidance threshold is defined as a value that allows the user to fully recognize the guidance of the normal guidance point Pu in the normal mode, and the minimum threshold distance Sth for each reference vehicle speed V is defined as the minimum distance. In some cases, the minimum threshold time Tth may be defined as the minimum value of time.

For example, as the former minimum threshold distance Sth, Sth1 (m) is defined for a road having a reference vehicle speed V1 (km / h), and Sth2 (m) is defined for a road having a reference vehicle speed V2 (km / h). Also, it is assumed that, out of the total number Nu of normal guidance points Pu acquired in step 22, the number of normal guidance points with the reference speed V1 is nu1, and the number of normal guidance points with the reference speed V2 is nu2.
In this case, since V (km / h) = V / 3.6 (m / s), the time required to pass the minimum threshold distance Sth is (Sth1 × 3.6) / V1, (Sth2), respectively. × 3.6) / V2.
Accordingly, the total minimum time Tthall = (Sth1 × 3.6 × nu1) / V1 + (Sth2 × 3.6 × nu2) / V2 when all normal guidance points Pu are guided.
From the above, the control unit 20 compares Tthall and Tontotal. If Tontotal <Tthall, the control unit 20 determines that the remaining battery level is insufficient. If Tontotal ≧ Tthall, the control unit 20 determines that the remaining battery level is not insufficient.

On the other hand, when the minimum threshold time Tth is defined as the minimum guidance threshold, the total minimum time Tthall when guiding all the normal guidance points Pu is Tthall = Nu × Tth.
Accordingly, the control unit 20 determines that the remaining battery capacity is insufficient if the total time Tontotal <total minimum time Tthall, and determines that the remaining battery capacity is not insufficient if the total time Tontotal ≧ total minimum time Tthall.
In the present embodiment, whether or not the remaining battery level is insufficient is determined after calculating the total time Tontotal and before calculating the switching points R and F. If the remaining battery level is insufficient, Power consumption can be reduced.

When it is determined from the total time Tontotal in the normal mode that the remaining battery level is not insufficient (step 25; N), the control unit 11 sets the switching points R and F for each guide point P (step 26).
Each guide point P includes a normal guide point Pu and a special guide point PAl, and both guide points Pu and PAl are further classified for each reference speed V of the road where the point exists.
In order to determine the switching points R and F of the guidance point P, a distance between the switching point R and the switching point F is necessary, and this distance is a normal mode time allocated to one guidance point P. Can be obtained by multiplying this time by the reference speed V.

Therefore, the control unit 11 uses the ratio x (<1) of the time used for the normal guidance point Pu in the total time Tontotal (s) of the normal mode expressed by the above formula (5) and the special guidance point PAl. The proportion of time (1-x) is determined. Although the value of x is arbitrary, in this embodiment, for example, x = 0.7.
Therefore, the total time of the normal mode for all the normal guidance points Pu is xTontotal.
Further, the total time of the normal mode for all the special guide points PAl is (1 · x) Tontotal.

Next, the control unit 11 further obtains a guide point ratio ku for each road type where the normal guide point Pu exists with respect to the total time xTontotal in the normal mode. In this embodiment, the reference speed V defined for each road is used as the road type, but it may be classified for each road management entity such as an expressway, a national road, a prefectural road, and the like.
When the number of normal guidance points of the same reference speed V acquired from the information on the travel route 31 is nu, the total number of normal guidance points is Nu, and the road type ratio ku = nu / Nu for each reference speed of the normal guidance points Pu. is there.
Therefore, for example, if the number of normal guide points nu = 5 on the road having the reference speed V = 50 km / h out of the total number of normal guide points Nu = 20, the road type ratio ku = nu / Nu = 5/20 Become.

Similarly, the control part 11 calculates | requires the special guidance point ratio kAl for every road classification in a road section.
That is, when the number of special guidance points for each reference speed in the special guidance point PAl in the road section is nAl, the total number of special guidance points is NAl, so the road type ratio kAl = nAl / NAl of the special guidance point PAl. .

Next, the control unit 11 calculates the section distance S in the normal mode per one guide point P (Pu, PAl).
The section distance S with respect to the guidance point P is the distance from the switching point R to the switching point F. The distance from the switching point R to the guidance point P (front distance) and the distance from the guidance point P to the switching point F (passing) It is the sum of the rear distance (see FIG. 3).
However, in the distance from the switching point R to the switching point F, how to determine the near distance and the distance after passing is arbitrary. For example, in the case of the present embodiment, the distance after passage is uniformly w (m) (for example, 20 m), and the remaining distance is the near distance. In addition, the near distance may be 90% and the distance after passing may be 10%.

Hereinafter, as the section distance S in the normal mode, the normal section distance Su of the normal guide point Pu and the special section distance SAl of the special guide point PAl are obtained.
Of the total time Tontotal of the normal mode represented by the above formula (7), the total time of all the normal guidance points Pu is xTontotal. Further, among all the normal guidance points Pu, the road type ratio ku for each reference speed V is ku = nu / Nu.
Therefore, the control unit 11 obtains the normal mode distance (normal section distance Su) per one normal guidance point Pu from the following equation (8).
Su = ku × x Tontotal × V / nu (8)

Similarly, the control unit 11 obtains the normal mode distance (special section distance SA1) per special guidance point PAl in the road section from the following equation (9).
SAl = kAl × (1 · x) Tontotal × V / nAl (9)

From the above, the control unit 11 sets the point (Su-20) m before the normal guidance point Pu as the switching point R for switching from the power saving mode to the normal mode, and is 20 m (uniform value) ahead of the normal guidance point Pu. Is set as the switching point F.
Further, the control unit 11 sets the point (SAl-20) m before the special guidance point PAl as the switching point R, and sets the point 20 m (uniform value) ahead of the special guidance point PAl as the switching point F.

  In the present embodiment, as shown in the above formulas (8) and (9), the section distance S (Su, SAl) between the guide points Pu, PAl is determined according to the reference speed V. That is, by shortening the section distance S as the reference speed V is smaller, the time of the power saving mode is lengthened, and an increase in unnecessary power consumption can be suppressed.

Next, the control unit 11 performs switching / guidance processing based on the actual vehicle speed v based on the set switching points R and F (step 27).
FIG. 5 is a subroutine showing details of the switching / guidance process.
In this subroutine, the control unit 11 monitors whether or not the current position acquired by the GPS receiver 14 has reached the switching point R (step 51), and is not the switching point R (step 51; N). Continue monitoring.

  On the other hand, when the current position is the switching point R (step 51; Y), the control unit 11 acquires the actual vehicle speed v (step 52). Here, the vehicle speed v is calculated from the amount of change in the current position of the GPS receiver 14 using the time measured by the clock provided in the control unit 11, but may be calculated from the measured value of the acceleration sensor and the time. Good. In addition, when the vehicle speed v can be acquired from the vehicle via the communication control unit 16, the vehicle speed v can also be used.

The control unit 11 determines whether or not the acquired vehicle speed v is smaller than the reference speed V of the guidance point P existing ahead of the switching point R detected in step 51 (step 53).
When the vehicle speed v is less than the reference speed V (step 53; Y), the control unit 11 corrects the current switching point R to the switching point r close to the guide point P as described in FIG. Step 54). When the distance (front distance) from the switching point R, r to the guide point P is represented by R, r, the control unit 11 calculates the front distance r from the following equation (10). w is a uniform distance after passage = 20 (m).
r = {(R + w) × (v / V)} − w (10)

Note that not only the switching point R but also the distance f after passage to the switching point F may be corrected according to the vehicle speed v instead of the uniform w = 20 (m).
In this case, the near distance r = R × (v / V) and the post-passage distance f = w × (v / V).

The control unit 11 monitors whether the current position has reached the corrected switching point r (step 55). If not, the control unit 11 continues monitoring (step 55; N).
When the current position reaches the switching point r (step 55; Y) and when the vehicle speed v is equal to or higher than the reference speed V (step 53; N), the control unit 11 switches from the power saving mode to the normal mode. Then, the guidance point P is guided (step 56). In this guidance, as shown in FIG. 3C, the control unit 11 displays an enlarged view on the display 121 that displays the travel route and the current position on a map around the current position, and displays the course direction of the guidance point P. indicate.
Further, when the travel route guidance program has a voice guidance function, a guidance voice such as “Xm ahead” is output from the speaker 122.

The control unit 11 passes through the guidance point P in the state switched to the normal mode, and monitors whether or not the current position has reached the switching point F (step 57), and if not reached (step 57; N). Continue monitoring.
On the other hand, when the current position reaches the switching point F (step 57; Y), the control unit 11 switches to the power saving mode (step 58). That is, the control unit 11 turns off the display 121 displayed in the normal mode, switches to the power saving mode, and returns to the main routine of FIG.

Next, the control unit 11 returns to FIG. 4 and determines whether or not the update threshold time Tall has elapsed (step 28). That is, every time the guidance of the guidance point P is completed, the control unit 11 determines whether or not the elapsed time since the last switching point R or F has been set exceeds the update threshold time Tall. The regulation of the update threshold time Tall is arbitrary, but in this embodiment, it is regulated to 60 minutes.
If the update threshold time Tall has not elapsed (step 28; N), the control unit 11 determines whether or not the destination has arrived (step 29), and if it has not arrived at the destination (step 29). 29; N), returning to the subroutine of FIG. 27 (FIG. 5), the arrival at the switching point R set for the next guide point P is monitored.

On the other hand, when the update threshold time Tall has elapsed (step 28; Y), the control unit 11 updates the available power Clim to the current value (step 30). Then, the control unit 11 uses the updated usable power Clim to set the switching points R and F for the guide point P on the travel route from the current position to the destination, to switch the mode at the point, and to travel Continue route guidance. In this way, by newly setting the switching points R and F every time the update threshold time Tall elapses, it is possible to perform guidance for a longer time with higher accuracy while correcting the error.
In step 21, when the usable power Clim is calculated by the equation (2), that is, when the destination is a chargeable destination, the control unit 11 acquires the current battery remaining amount Bnow and obtains the equation (2). ) To calculate Clim.
On the other hand, when the usable power Clim is calculated by the equation (1), that is, when the destination is not capable of being charged, the control unit 11 acquires the current battery remaining amount Bnow. And the control part 11 calculates new Clim from following Formula (11), when the available electric power to update is new Clim, and the available electric power acquired at step 22 is old Clim.
New Clim = Bnow-Old Clim ... (11)
In addition, in the case where the calculation is performed by the equation (1-2) shown as a modification, the calculation is performed from new Clim = Bnow−old Clim−Z.

By the way, when it is determined in step 25 that the remaining battery level is insufficient from the total time Tontotal in the normal mode (step 25; Y), the control unit 11 notifies the user that the remaining battery level is insufficient. (Step 31).
Then, an inquiry for confirming whether or not the travel route guidance is to be continued even if the battery is insufficient is displayed on the display 121, and it is confirmed whether or not the answer is guidance (step 32). When guidance is not selected (step 32) Step 32; N), the controller 11 ends the process without guiding the travel route.

On the other hand, when guidance is selected (step 32; Y), the control unit 11 guides to a place that can be reached by the minimum threshold distance Sth (step 33).
That is, the control unit 11 changes both the normal section distance Su and the special section distance SAl to the minimum threshold distance Sht, and switches from the minimum threshold distance Sth to the switching points R and F between the normal guide point Pu and the special guide point PAl. And the guidance of the travel route 31 is continued using the switching points R and F. The guidance here is the same as in the subroutine of FIG.

Next, an embodiment in which the switching points R and F are set will be described.
First, the initial setting adopted or specified in this embodiment will be described.
(A) Voice guidance is performed even in the power saving mode with the screen off.
(B) The normal mode time for at least one guide point P is set to the minimum threshold time Tth = 5 (s) or more.
In this case, time is used as a threshold value instead of the minimum threshold distance Sth, and both are common in that they are minimum values that allow the user to confirm the guidance screen in the normal mode.
(C) The distance after passing from the guidance point P to the switching point F is uniformly 20 m.

(D) The maximum section distance (threshold value) for the section distance S (normal section distance Su, special section distance SAl) to be set to the normal mode for one guide point P is set, and when this maximum section distance is exceeded, The switching points R and F are set with the maximum section distance.
The maximum section distance of the section distance S is a modification that is not included in the embodiment described in FIG. This deformation prevents the normal mode time from becoming unnecessarily long.
In this embodiment, the maximum section distance is 500 m for a road having a reference speed V1 = 40 km / h and 800 m for a road having a reference speed V2 = 60 km / h. Therefore, on the road with the reference speed V1 = 40 km / h, the switching point R is set 480 meters before the guidance point P, and the switching point F is set 20 meters ahead. On the road with the reference speed V2 = 60 km / h, the switching point R is set 780 m before the guidance point P, and the switching point F is set 20 m ahead.
Note that, similarly to the initial setting (b) in which the minimum threshold time Tth is used instead of the minimum threshold distance Sth, the maximum section time may be used instead of the maximum section distance. The maximum section time in this case is a time converted from the reference speed V and the maximum section distance.

(E) For the road section, there is one special guide point per 1 km.
(F) As a priority for performing screen display by setting the normal mode, the normal guide point Pu is set to be higher than the special guide point PAl in the road section. However, distribution and combination are arbitrary, and it is possible to define the priority order assuming other guide points.

(G) Distribution of total time Tontotal (s) in normal mode It is assumed that the ratio of normal guide points Pu is x = 0.8 and the ratio of special guide points PAl (1-x) = 0.2.
That is, the time used for the normal guidance point Pu is set to 80% of the total time Tontotal, and the time used for the special guide point PAl is set to 20% of the total time Tontotal. This ratio is an example and can be changed according to the mobile terminal device 1.
For example, assuming that the total time Tontotal = 200 (s) in the normal mode, the total time based on the initial setting values x and (1-x) is as follows.
Total time xTontotal = 0.8 × 200 = 160 (s) allocated to the entire normal guidance point Pu
Total time allocated to the entire special guidance point PAl (1-x) Tontotal = 0.2 × 200 = 40 (s)

However, the actual total time is determined in consideration of the initial conditions (b) and (f).
Therefore, in the following cases where the total number of normal guidance points Nu and the total distance LAl of all road sections are different as examples, the normal guidance points Pu and the special ones that are finally determined in consideration of the initial settings (b) and (f) The total time allocated to the guide point PAl will be described.

(I) Case 1
Case 1 is a case where the total number of normal guidance points Pu (the total number of normal guidance points Nu) is 20, and the total distance LAl of all road sections is 5 km.
Since the minimum threshold time Tth for one guide point Tth = 5 (s), Nu × 5 (s) = 20 × 5 = 100 (s) is required for the entire normal guide points Pu (20).
On the other hand, the initial total time allocated to the normal guidance point Pu is xTontotal = 0.8 × 200 = 160 (s), which is longer than the total minimum threshold time 100 (s).
Therefore, the total time of the final normal guidance point Pu is 160 (s).

Since the total distance LAl of all road sections is 5 km, the total number of special guide points PAl (total number of special guide points NAl) is 5 from the initial setting (e).
The total minimum threshold time of all the special guidance points PAl (5) needs to be Nu × 5 (s) = 5 × 5 = 25 (s).
On the other hand, the total time of the initial setting assigned to the special guide point PAl is (1-x) Tontotal = 0.2 × 200 = 40 (s), which is longer than the total minimum threshold time 25 (s).
Therefore, the total time of the final special guide point PAl is 40 (s).

(Ii) Case 2
Case 2 is a case where the total number of normal guidance points Nu is 40 and the total distance LAl of all road sections is 10 km.
The total minimum threshold time for the entire normal guidance point Pu (40) needs to be Nu × 5 (s) = 40 × 5 = 200 (s).
On the other hand, the initial total time allocated to the normal guidance point Pu is xTontotal = 0.8 × 200 = 160 (s), which is smaller than the total minimum threshold time 200 (s). Further, the total minimum threshold time Nu × 5 (s) = 200 (s) is equal to or less than the total time Tontotal = 200 (s).
Therefore, the total time of the final normal guidance point Pu is the total minimum threshold time of 200 (s).

All of the total time Tontotal = 200 (s) is used for guidance (normal mode) of the normal guidance point Pu according to the initial setting (f).
Therefore, the total time of the final special guide point PAl is 0 (s). That is, switching to the normal mode is not performed in the road section.

(Iii) Case 3
Case 3 is a case where the total number of normal guidance points Nu is 20, and the total distance LAl of all road sections is 15 km.
Since the total number of normal guidance points Nu is the same as 20 in case 1, the total time of the final normal guidance point Pu is 160 (s).

Since the total distance LAl = 15 km of the whole road section, the total number of special guidance points NAl = 15.
The total minimum threshold time for the entire special guide point PAl (15) needs to be Nu × 5 (s) = 15 × 5 = 75 (s).
On the other hand, the initial total time is (1-x) Tontotal = 0.2 × 200 = 40 (s), which is smaller than the total minimum threshold time 75 (s).
However, the total time of the total minimum threshold time 75 (s) and the total time 160 (s) of the final normal guidance point Pu is 235 (s), exceeding the total time Tontotal = 200 (s) in the normal mode. End up.
Therefore, the total time of the final special guide point PAl is the remaining time used preferentially for the normal guide point Pu, that is, 200−160 = 40 (s).

In this case, the special guide point PAl is a guide point in the road section, so that it is allowed to be shorter than the minimum threshold time Tth = 5 (s), and the individual guide time is 40 (s) / 15 (pieces) = 2.7 (seconds / piece).
However, the minimum threshold time Tth = 5 (s) may also be set for the special guidance point PAl. In this case, of the 15 special guide points PAl, the first 8 locations (40/5 = 8) are set to the minimum threshold time Tth = 5 (s), and the remaining 7 locations are set to 0 (s) in the normal mode. Switching to is not performed.
Thus, even if it is a case where the minimum threshold time Tth = 5 (s) cannot be secured for all the special guidance points PAl, the lack of power to the user is not notified.

(Iv) Case 4
Case 4 is a case where there are 50 guide points and the total distance LAl of all road sections is 10 km.
The total minimum threshold time of all the normal guidance points Pu (50) needs to be Nu × 5 (s) = 50 × 5 = 250 (s), and exceeds the total time Tontotal = 200 (s).
Therefore, the battery shortage is notified (see step 31 in FIG. 4).
Thus, unlike Case 3, when the minimum threshold time Tth = 5 (s) cannot be secured for all normal guidance points Pu, the user is informed of power shortage.

Based on the above initial settings, the setting of the switching points R and F when performing guidance from the home to the shopping mall will be described.
(A) Acquisition of travel route and calculation of usable power Clim from the destination type (steps 20 and 21).
The acquired battery remaining amount Bnow is Bnow = 90%.
Since the shopping mall that is the destination of the travel route needs to secure the remaining battery charge for return, the usable power Clim is calculated from the equation (1).
Clim = ((Bnow · 10%)) · 2 = (90 · 10) / 2 = 40 (%)

(B) Obtaining guidance information from the travel route 31 (step 22).
Each value is acquired from the travel route 31.
・ Total arrival time to destination Tarr = 50 (min) = 3000 (s)
・ Total number of normal guide points Pu = Total number of normal guide points Nu = 20 (pieces)
Among the 20 normal guide points Pu, the number of normal guide points nu1 = 10 (pieces) with the reference speed V1 = 40 (km / h) = 11.1 (m / s), and the reference speed V2 = 60 (km) / H) = normal guidance point number nu2 = 10 (pieces) = 16.7 (m / s).
The total distance of all road sections on the travel route 31 is LAl = 18 (km), and the breakdown by speed is the reference speed V1 = 8 (km) and the reference speed V2 = 10 (km).
Therefore, the total number of special guide points NAl = 18/1 = 18 (pieces), the number of special guide points nAl1 = 8/1 = 8 (pieces) for the reference speed V1, and the number of special guide points nAl2 = 10/1 = 10 for the reference speed V2. (Pieces).

(C) Obtaining consumption times Uon and Uoff of electric power 1 (%) (step 23).
Uon and Uoff are calculated and acquired from the remaining battery level acquired at 10-second intervals.
In the normal mode in which the screen is turned on, power 1 (%) is consumed in 1 minute (= 60 s), so Uon = 60/1 = 60 (s /%).
In the power saving mode in which the screen is turned off, power 1 (%) is consumed in 5 minutes (= 300 s), so Uoff = 300/1 = 300 (s /%).

(D) Calculation of total time Tontotal and Tofftotal to destination (step 24)
From the equations (3) and (6), the following simultaneous equations are established.
Tarr (3000 (s)) = Tontotal + Tofftotal
Clim (40 (%)) = (Tontotal / Uon) + (Tofftotal / Uoff) = (Tontotal / 60) + (Tofftotal / 300)
By solving these simultaneous equations, Tontotal = 2250 (s) and Tofftotal = 750 (s) are obtained.

(E) Judgment whether or not the remaining battery capacity is sufficient to reach the destination (step 25).
The final total time of the normal guidance point Pu and the total time of the special guidance time PAl are determined. Since the minimum threshold time Tth = 5 (s), the minimum total time required to guide all the normal guidance points Pu. The value tumin is tumin = 5 × Nu = 5 × 20 = 100 (s).

On the other hand, in the initial setting (d), the maximum section distance of the road with the reference speed V1 = 40 km / h = 500 (m) and the maximum section distance of the road with the reference speed V2 = 60 (km / h) = 800 (m). It is prescribed.
The time for passing the maximum section distance of 500 m at the reference speed V1 = 40 (km / h) = 11.1 (m / s) is 500 / 11.1 = 45.0 (s). The time for passing the maximum section distance 800 (m) at the reference speed V2 = 60 (km / h) is 800 / 16.7 = 47.9 (s).
From (b) above, the total number of normal guide points Pu = the total number of normal guide points Nu = 20 (pieces), of which the number of normal guide points nu1 = 10 (pieces) of the reference speed V1, and the normal guide point of the reference speed V2. The score nu2 = 10 (pieces).

  Accordingly, the total time for guiding the number of normal guidance points nu1 (= 10) at the reference speed V1 = 45.0 × 10 = 450 (s), and the total time for guiding the number of normal guidance points nu2 at the reference speed V2 = 47.9. Since × 10 = 479 (s), the maximum value tumax of the total time for guiding all normal guidance points Pu is tumax = 450 + 479 = 929 (s).

The ratio of distribution from the initial setting (g) to the entire normal guidance point Pu is x = 0.8, and from (d) to Tontotal = 2250 (s).
Accordingly, the total time in the normal mode for all the normal guidance points Pu is xTontotal = 0.8 × 2250 = 1800 (s), and the maximum value of the total time for guiding all the normal guidance points Pu, tumax = 929 (s). Too long.
Therefore, the total time of the final normal guidance point Pu is set to 929 (s).

Similarly, the total time of the special guidance point PAl in the road section is determined.
That is, the minimum value tAlmin of the total time required to guide all the special guide points PAl is tAlmin = 5 × the total number of special guide points NAl = 5 × 18 = 90 (s).
Also, the total time for guiding the number of special guide points nAl1 = 8 (pieces) at the reference speed V1 obtained in (b) = 45.0 × 8 = 360 (s), the number of special guide points nAl2 = at the reference speed V2. Since the total time for guiding 10 (pieces) = 47.9 × 10 = 479 (s), the maximum value of the total time for guiding all the special guide points PAl is tAlmax = 360 + 479 = 839 (s).

The ratio of distribution from the initial setting (g) to the entire special guide point PAl is (1-x) = 0.2, and from (d) above, Tontotal = 2250 (s).
Accordingly, the total time of the normal mode for all the special guide points PAl is (1-x) Tontotal = 0.2 × 2250 = 450 (s), and tAlmin <452s <tAlmax.
Therefore, the total time of the final special guide point PAl is set to 452 (s).

Thus, the total of the final total time of the normal guidance point Pu is 929 (s) and the total time of the special guidance point PAl is 450 (s), which is 1379 (s). Furthermore, Tontotal = 2250 (s) can be made smaller, and significant power consumption can be reduced.
This is because the time in the normal mode is not unnecessarily increased by setting the maximum section distance with respect to the section distance S (normal section distance Su, special section distance SAl) in the initial setting.

(F) Setting of switching points R and F In (e) above, the normal guidance point Pu is the total time allocation time xTontotal = 1800 (s) according to the initial setting x, and the total time tumax for guiding all the normal guidance points Pu. = 929 (s) is exceeded.
For this reason, the switching points R and F are set with the maximum section distance of the initial setting (d).
That is, for the normal guidance point Pu with the reference speed V1 = 40 (km / h), the switching point R is set a distance of 480 m in front of the normal guidance point Pu, and the switching point F is set a distance of 20 m after the passage. Set.
In addition, for the normal guidance point Pu with the reference speed V2 = 60 (km / h), the switching point R is set a distance of 780 m in front of the normal guidance point Pu, and the switching point F is set a distance of 20 m after the passage. Set.

On the other hand, the switching points R and F of the special guidance point PAl in the road section are as follows.
Since the number nAl1 of the special guide points obtained at (b) above is 8 (pieces) for the reference speed V1 = 40 (km / h), the ratio of the reference speed V1 is kAl1 = nAl1 / NAl = 8/18. .
Therefore, the special section distance SAl1 of the reference speed V1 is SAl1 = kAl1 × (1 · x) Tontotal × V1 / nAl1 = (8/18) × (450/8) × 11.1 = 278 m from the equation (9). is there.
Similarly, since the number of special guide points nAl2 at the reference speed V2 = 60 (km / h) is 10 (pieces), the ratio of the reference speed V2 is kAl2 = nAl2 / NAl = 10/18.
Accordingly, the special section distance SAl2 of the reference speed V2 is SAl2 = kAl2 × (1 · x) Tontotal × V2 / nAl2 = (10/18) × (450/10) × 16.7 = 418 m.

Therefore, for the special guidance point PAl at the reference speed V1, the switching point R is set a short distance 258 (= 278-20) m from the special guidance point PAl, and the switching point F is set a distance 20 m after the passage. Set.
For the special guide point PAl at the reference speed V2, the switching point R is set in front of the special guide point PAl by a distance of 398 (418-20) m, and the switching point F is set after the distance of 20 m after passing. To do.

(G) Correction and guidance of the switching point R according to the current vehicle speed v (step 27)
For example, when the vehicle travels on a road having the reference speed V1 = 40 (km / h) and reaches the switching point R (front 480 m) of the normal guidance point Pu, the actual vehicle speed v is 30 (km / h). Since the vehicle speed v is slower than the reference speed V1 (v <V1), only the voice is output at the switching point R without switching to the normal mode, and the switching point r is calculated. The voice at this time is, for example, a content that informs that the normal guide point Pu is near, such as “It is a guide point soon”.

The switching point r is changed by {(R + w) × v / V1} −w = {(480 + 20) × 30/40} −20 = 355 (m) before the normal guidance point Pu according to the above equation (10). .
Since the switching point F is a uniform value (w = 20), there is no change.

(G) Elapse of update threshold time Tall (step 28)
When the traveling time is long, the switching points R and F are recalculated by repeating the above (a) to (f) at a constant time interval to the destination in order to increase the management accuracy of the remaining battery level.

As described above, according to the present embodiment, the switching point between the power saving mode and the normal mode is determined based on the total power consumption in the normal mode and the total power consumption in the power saving mode based on the remaining capacity of the battery. Since the power is set to be equal to or less than the possible power Clim, guidance within the remaining battery capacity can be realized.
Further, when setting the switching point, the reference speed V of the road is used, and the switching point is set so that the distance to the guidance point (front distance) becomes shorter as the reference speed V is slower (expression ( 8) and (9)), the power saving mode time is lengthened, and an unnecessary increase in power consumption can be suppressed.

Further, the switching points R and F set based on the reference speed V are corrected so as to be close to the guide point P according to the actual vehicle speed v traveling in the normal mode section.
As a result, it is possible to avoid the normal mode for a longer time than the guidance time assigned to the guidance point P. As a result, unexpected power consumption can be suppressed, and travel guidance for a longer distance can be performed.

  Further, the available power Clim is determined by determining whether or not the battery can be charged at the destination, that is, whether guidance to the destination is sufficient or whether guidance from the destination to the departure point is necessary. Has been decided. As a result, guidance within the remaining battery level is possible not only when route guidance is provided for one way to the destination but also when route guidance is provided for a round trip route to the destination.

While the embodiments and examples of the present invention have been described above, the present invention is not limited to the described embodiments, and various modifications can be made within the scope described in each claim.
For example, in the described embodiment, the case where the switching point R is corrected when the vehicle speed v is less than the reference speed V has been described.
On the other hand, when the vehicle speed v is higher than the reference speed V, the vehicle arrives at the guide point P in a time shorter than the assumed time, and the user makes a mistake in the travel route without sufficiently recognizing guidance such as a route change. There is a possibility.
Therefore, when the vehicle speed v is higher than the reference speed V, the switching point R may be changed to a point closer to the front (a point farther from the guide point P).
In this case, the vehicle speed v is measured a predetermined distance before the set switching point R, and if v> V, the switching point R is changed to the v / V point.

In the embodiment described above, it is determined whether the remaining battery level is insufficient using the total time Tontotal (s) calculated in step 24 (step 25).
On the other hand, whether or not the normal section distance Su in the normal mode obtained in the process of setting the switching points R and F for each guide point P described in step 26 is not less than the minimum threshold distance Sth (Su ≧ Sth). It may be determined whether or not the remaining battery level is insufficient.
That is, the control unit 20 determines that the remaining battery level is not insufficient if the normal section distance Su ≧ minimum threshold distance Sth, and executes the switching / guidance process (step 27) in FIG. 5, and if Su <Sth. It is determined that the remaining battery level is insufficient, and the process proceeds to step 31.

DESCRIPTION OF SYMBOLS 11 Control part 12 Output part 121 Display 13 Input part 131 Touch panel 14 GPS receiver 15 Memory | storage part 16 Communication control part 17 Battery 31 Travel route Bnow Battery remaining amount (%)
Clim usable power (%)
ku Ratio of road types by standard speed of normal guidance point Pu kAl Ratio of road types by standard speed of special guidance point PAl LAl Total distance of all road-like sections Nu Total number of normal guidance points (pieces)
Total number of NAL special guide points (pieces)
n Number of guide points by reference speed V (pieces)
nu Number of normal guidance points with reference speed V
Number of special guide points for nAl reference speed V (pieces)
P Guide point Pu Normal guide point PAl Special guide point R, F Switching point r, f Switching point after change (front distance, distance after passing) (m)
S Section distance in normal mode per one guide point P (m)
Su Normal section distance in normal mode per one normal guide point Pu (m)
SA1 Special section distance in normal mode per special guide point PAl (m)
Sth minimum threshold distance (m)
Tth minimum threshold time (s)
Tarr Total time required to reach the destination (s)
Tontotal Normal mode total time (s)
Tofftotal Total time of power saving mode (s)
Tall update threshold time (s)
tumin Minimum value (s) of total time required to guide all normal guidance points Pu
tumax Maximum value of total time to guide all normal guidance points Pu (s)
tAlmin Minimum value (s) of total time required to guide all special guidance points PAl
tAlmax Maximum value of total time to guide all special guide points PAl (s)
Uon Normal consumption time (s) of power 1 (%) in normal mode
Power saving time (s) of power 1 (%) in Uoff power saving mode
V Reference speed (km / h)
v Traveling vehicle speed (km / h)
w Distance after passing (m)
x Percentage of time used for normal guidance point Pu (1-x) Percentage of time used for special guidance point PAl Z Reserve power (%)

Claims (8)

Route acquisition means for acquiring a travel route from a predetermined departure point to a destination;
Guidance means for acquiring a guidance point existing on the travel route and displaying a guidance screen of the guidance point;
Usable power acquisition means for acquiring available power based on the remaining capacity of the battery mounted on the mobile terminal;
Before and after the guidance point, switching point determination means for determining a switching point for switching between the normal mode for displaying the guidance screen and the power saving mode,
Current position acquisition means for acquiring a current position of the mobile terminal;
Mode switching means for switching between the normal mode and the power saving mode when the current position is the determined switching point;
Power consumption acquisition means for acquiring power consumption in the normal mode and power consumption in the power saving mode;
The switching point determination means switches the guide point so that the total power consumption in all sections traveling in the normal mode and the total power consumption in all sections traveling in the power saving mode is equal to or less than the usable power. Determine the point,
The portable terminal device characterized by the above-mentioned. The switching point determination means further determines a switching point according to the number of the obtained guidance points;
The mobile terminal device according to claim 1. The switching point determination means determines a point to switch from the power saving mode to the normal mode before the guidance point, and a point to switch from the normal mode to the power saving mode after passing through the guidance point.
The mobile terminal device according to claim 1, wherein the mobile terminal device is a mobile terminal device. Vehicle speed acquisition means for acquiring a reference speed V determined corresponding to each road constituting the acquired travel route;
The switching point determination means is based on the distance of all sections traveling in the normal mode and the reference speed V in the section, and on the distance of all sections traveling in the power saving mode and the reference speed V in the section. Calculating the total power consumption,
The portable terminal device according to claim 1, claim 2, or claim 3. Current vehicle speed acquisition means for acquiring the current vehicle speed v of the vehicle;
Switching point changing means for changing the switching point according to the acquired current vehicle speed v,
The switching point changing means changes the switching point to the corresponding guidance point side when the current vehicle speed v at the switching point is less than the reference speed V corresponding to the road of the switching point.
The mobile terminal device according to claim 4. Charging possibility determination means for determining whether charging is possible at the destination;
The usable power acquisition means halves the usable power when charging is not possible with respect to the usable power when charging is possible at the destination,
The portable terminal device according to any one of claims 1 to 5, wherein the portable terminal device is a device. In the power saving mode, the display of the guidance screen is turned off.
The mobile terminal device according to any one of claims 1 to 6, wherein the mobile terminal device is a mobile terminal device. Computer
A route acquisition function that acquires a travel route from a predetermined departure point to a destination,
A guidance function for acquiring a guidance point existing on the travel route and displaying a guidance screen of the guidance point;
An available power acquisition function that acquires available power based on the remaining capacity of the battery installed in the mobile device,
A switching point determination function for determining a switching point for switching between the normal mode for displaying the guidance screen and the power saving mode before and after the guidance point,
A current position acquisition function for acquiring a current position of the mobile terminal;
A mode switching function for switching between the normal mode and the power saving mode when the current position is the determined switching point;
Power consumption acquisition function for acquiring power consumption in normal mode and power consumption in power saving mode,
A mobile terminal program to be realized as
The switching point determination function switches the guidance point so that the total power consumption in all sections traveling in the normal mode and the total power consumption in all sections traveling in the power saving mode is equal to or less than the usable power. Determine the point,
A portable terminal program characterized by that.

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