JP2013138405A - Portable device and on-vehicle system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable device capable of reliably charging a secondary battery while maintaining functions as much as possible.SOLUTION: A portable terminal device 10 includes: a control unit 12 and others for implementing a plurality of functions which can be individually activated, stopped, and restricted in operation, and have priority levels set for each of the functions; a secondary battery 30 for supplying electric power required for implementing the functions performed by the control unit 12 and the others; a charging circuit 32 for charging the secondary battery 30 by using a charged electric power provided by an external source; a discharge determination unit 34A for determining whether the secondary battery 30 is discharging or not during a charging operation; and a function interruption instruction unit 34B for instructing the control unit 12 and the others to stop implementing some functions with lower priority levels or restricting the operation of such functions when discharging is determined.

Description

  The present invention relates to a portable device in which a built-in secondary battery is charged via a power feeding path and an in-vehicle system including the portable device.

  Traditionally, each power provision for higher priority functional processing capability features at the expense of lower priority functional processing capability features based on the remaining power capacity of the battery and the power consumption rate of the portable device. There is known a portable device that dynamically controls a function processing capability feature (see, for example, Patent Document 1). Thereby, when the remaining power capacity of the battery decreases, it becomes possible to lengthen the operation time of the high-priority functional processing capability feature.

JP 2010-503290 A (page 3-5, FIG. 1-10)

  In general, when a battery provided in a portable device is a secondary battery, when the remaining power capacity of the battery decreases, a user connects the portable device to a power supply path (for example, a USB connected to a personal computer or an in-vehicle device). The secondary battery is charged by connecting to a cable or a power adapter cable.

  Particularly recently, the number of mobile terminals called smartphones has increased. This smartphone has a large LCD (liquid crystal display device) and has a feature capable of simultaneously executing a plurality of application programs, and the power consumption increases with these features.

  On the other hand, when charging a secondary battery in a smartphone by connecting to a personal computer or in-vehicle device via a USB cable, the current value that can be supplied is up to 0.5A, and the backlight of the LCD If many application programs are executed at the same time with the brightness maximized, the current consumption may exceed 0.5A, and the USB cable is connected to charge the battery. There was a problem that. Even when the power adapter cable is connected for charging, only the upper limit of the current value that can be supplied is increased, and there is a similar problem. Moreover, the same situation (discharge of the secondary battery) can occur in portable devices other than smartphones due to the relationship between supply current and consumption current.

  On the other hand, the method disclosed in Patent Document 1 described above focuses on maintaining a high-priority function and does not consider the charging of the secondary battery. It cannot be charged reliably.

  The present invention was created in view of the above points, and an object thereof is to provide a portable device and an in-vehicle system that can reliably charge a secondary battery while maintaining its function as much as possible. It is in.

  In order to solve the above-described problem, each of the portable devices of the present invention can be activated, stopped, or restricted, and a function execution unit that executes a plurality of functions, each of which has a priority set, A secondary battery for supplying power necessary for executing the function by the function execution means, a charging means for charging the secondary battery using charging power supplied from the outside, and a secondary battery during the charging operation by the charging means Stop the execution of some of the lower priority functions when the first discharge determination means for determining whether or not the discharge is performed and the determination that the first discharge determination means is discharging Alternatively, a function stop instruction means for instructing the function execution means to restrict the function operation is provided. As a result, it is possible to prevent the secondary battery from being discharged during the charging operation by implementing a plurality of functions and excessive power consumption. The secondary battery can be charged.

  In addition, it is desirable that the priorities of the plurality of functions described above are determined in advance. By predetermining the order in which functions are stopped or the like, processing can be simplified.

  Further, among the functions described above, when the first discharge determination means determines that the discharge is performed, the function with a low priority in which the execution of the function is stopped or the operation is preferentially performed. It is desirable to further include a stop function selecting means for the user to specify. As a result, the user can determine the order in which the functions are stopped, etc., so even if some functions are stopped, the functions that the user desires are maintained reliably. can do.

  Further, it is connected to an external device via a predetermined cable, and further includes interface means for transmitting / receiving data to / from each other via this cable, and charging of the secondary battery by the charging means is supplied from the external device via the cable. It is desirable that the charging be performed using the charging power. In particular, it is desirable that the cable is a USB cable and the interface means conforms to the USB standard. This makes it possible to reliably charge the portable device when the portable device is connected to an external device such as the in-vehicle device, and to link the functions of the portable device and the in-vehicle device.

  Further, the plurality of functions described above include the operation of turning on the backlight used for display, and it is desirable that the function stop instruction means instructs the backlight to be turned off or the luminance to be lowered. The power consumption required to turn on the backlight is large among portable devices, so by stopping the lighting operation (turning off) or restricting the operation (decreasing the brightness), the power supplied to the secondary battery can be reliably increased. Can do.

  The plurality of functions described above include at least one of a Bluetooth connection function and a wireless LAN connection function, and the function stop instruction means instructs to stop these connection functions when these connection functions are not used. It is desirable to do. By stopping unused Bluetooth connection functions and wireless LAN connection functions, it is possible to reliably increase the power used for charging the secondary battery without affecting the operation of the portable device.

  The function stop instructing unit described above is activated when the first discharge determining unit determines that the battery is discharged and the charge amount of the secondary battery has decreased below a reference value. It is desirable to instruct the function execution means to stop or limit the operation. As a result, even if the power consumption of the portable device is excessive, the function being executed can be maintained if the amount of charge (remaining battery power) of the secondary battery is sufficient.

  The in-vehicle system of the present invention includes the above-described portable device and an external device, and the external device determines whether or not the secondary battery is discharged during the charging operation by the charging means. A determination means; and a transmission / reception frequency changing means for reducing the frequency of transmission / reception of data to / from the portable device when the second discharge determination means determines that the battery is discharging. Accordingly, it is possible to further reduce the power consumption of the portable device by reducing the access frequency between the portable device and the external device.

  The in-vehicle system of the present invention is an in-vehicle system in which a portable device is connected to the in-vehicle device via a predetermined cable, and data is transmitted / received between the in-vehicle device and the portable device. Using function execution means for executing a predetermined function using data sent from the apparatus, a secondary battery for supplying power necessary for execution of the function by the function execution means, and charging power supplied from the outside A charging unit that charges the secondary battery, and the in-vehicle device includes a second discharge determination unit and a second discharge determination unit that determine whether or not the secondary battery is discharged during the charging operation by the charging unit. Transmission / reception frequency changing means for reducing the frequency of data transmission / reception to / from the portable device when it is determined that the battery is discharged. In particular, the transmission / reception frequency changing means described above increases the transmission / reception frequency by increasing the interval of transmitting / receiving data to / from the portable device when the second discharge determination means determines that the discharge has occurred. It is lowered. As a result, it is possible to prevent the secondary battery from being discharged during the charging operation by performing a predetermined function involving data transmission / reception and excessive power consumption, and maintain the function as much as possible. Thus, the secondary battery can be reliably charged.

  In addition, it is desirable that charging of the secondary battery by the above-described charging unit is performed using charging power supplied from the in-vehicle device via a cable. In particular, it is desirable that the cable described above is a USB cable, and the interface means conforms to the USB standard. This makes it possible to reliably charge the portable device when the portable device is connected to the in-vehicle device, and to link the functions of the portable device and the in-vehicle device.

  The portable device described above further includes communication means for communicating with an external server connectable via a predetermined network, and the function execution means is discharged by the second discharge determination means. When the determination is made, it is desirable to reduce the frequency of communication with the external server using the communication means. By reducing the frequency of communication with an external server that consumes a large amount of power, the power used for charging the secondary battery can be reliably increased.

  The transmission / reception frequency changing means described above transmits / receives data when the second discharge determination means determines that the battery is discharged and the charge amount of the secondary battery has dropped below a reference value. It is desirable to reduce the frequency. As a result, even when the power consumption of the portable device is excessive, if the amount of charge (remaining battery power) of the secondary battery is sufficient, data transmission / reception between the portable device and the in-vehicle device is restricted. It becomes possible to implement without.

1 is a diagram illustrating an overall configuration of an in-vehicle system according to a first embodiment. It is a flowchart which shows the operation | movement procedure of 1st Embodiment which performs a function stop or operation | movement restriction | limiting as needed during a charging operation. It is a flowchart which shows the operation | movement procedure of the modification of 1st Embodiment. It is a figure which shows the whole vehicle-mounted system structure of 2nd Embodiment. It is a flowchart which shows the operation | movement procedure which performs access restriction by the vehicle equipment side.

  Hereinafter, an in-vehicle system according to an embodiment to which a portable device of the present invention is applied will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram illustrating an overall configuration of an in-vehicle system according to the first embodiment. The in-vehicle system shown in FIG. 1 includes a mobile terminal device 10 and an in-vehicle device 50 that are connected to each other. The portable terminal device 10 as a portable device of the present invention has a plurality of functions, and some functions can be stopped or restricted, and a priority order is set in advance for each of the functions.

  The mobile terminal device 10 is a mobile terminal generally called a smart phone, for example, and has functions of a mobile phone and a mobile information terminal. The mobile terminal device 10 includes a control unit 12, an operation unit 13A, a touch panel 13B, an input processing unit 14, a display unit 15, a display processing unit 16, a telephone processing unit 18, a memory 20, an audio processing unit 22, an amplifier 23, and a speaker 24. , A USB (Universal Serial Bus) interface unit (USB I / F) 26, a wireless interface unit (wireless I / F) 28, a secondary battery 30, a power supply circuit 31, a charging circuit 32, and a charging control circuit 34.

  The control unit 12 controls the entire mobile terminal device 10 and executes various functions, and is realized by executing a predetermined program stored in the ROM or RAM by the CPU. The operation unit 13A includes various switches. The touch panel 13B detects the indicated position when a part of the screen of the display unit 15 is pointed by the user. The user can perform various operation instructions and various inputs using the touch panel 13B or the operation unit 13A. The input processing unit 14 monitors the operation content of the operation unit 13A and the touch panel 13B, and detects the content input by the user.

  The display unit 15 is configured by an LCD (Liquid Crystal Display). On the back side of the LCD, a backlight whose luminance can be changed is arranged. The display processing unit 16 displays an operation screen including a plurality of operation icons and a screen created by the control unit 12 on the display unit 15. The display processing unit 16 controls turning on / off of the backlight provided in the display unit 15 or controlling the luminance. The telephone processing unit 18 performs processing as a mobile phone. For example, the telephone processing unit 18 operates as a communication unit that performs outgoing / incoming processing with a base station (not shown) to perform call processing, Internet connection processing, and the like.

  The memory 20 stores map data, music data, video data, and their associated data. For example, it is configured using a semiconductor memory such as flash memory or RAM, a hard disk device, or the like. Note that the application program added by the user is stored in the memory 20.

  The audio processing unit 22 is for playing back music data read from the memory 20 when the mobile terminal device 10 operates as a music player. Is output. This audio signal is amplified by the amplifier 23 and output from the speaker 24.

  The USB interface unit 26 is used to input and output charging power and signals between the mobile terminal device 10 as a USB device (target) and the in-vehicle device 50 as a USB host in accordance with the USB standard. Includes target controller. The USB interface unit 26 and the in-vehicle device 50 as an external device are connected via a USB cable.

  The wireless interface unit 28 is a communication device (Bluetooth device) that performs wireless connection with the in-vehicle device 50 by Bluetooth (registered trademark) to transmit and receive various data. Note that, instead of performing the connection by Bluetooth, or in parallel, the connection may be performed by the wireless LAN.

  The secondary battery 30 is for supplying power necessary for executing various functions (described later) by the control unit 12 and power necessary for the operation of each component of the mobile terminal device 10. Actually, a power supply circuit 31 that generates a stable operating voltage based on the voltage across the secondary battery 30 is connected, and operating power is supplied from the power supply circuit 31 to each component. The charging circuit 32 charges the secondary battery 30 when the USB interface unit 26 is connected to the in-vehicle device 50 via the USB cable and charging power is supplied from the in-vehicle device 50 side.

  The charging control circuit 34 controls the charging operation for the secondary battery 30 by the charging circuit 32. The charge control circuit 34 includes a discharge determination unit 34A and a function stop instruction unit 34B. The discharge determination unit 34A monitors the charge amount (remaining battery amount) of the secondary battery 30, and determines whether or not the secondary battery 30 is discharged during the charging operation by the charging circuit 32. When the discharge determination unit 34A determines that the discharge is being performed, the function stop instruction unit 34B displays the control unit 12 or the display indicating the stop of the execution of some functions with lower priority or the operation restriction of this function. The processing unit 16 is instructed.

  Next, specific examples of various functions executed by the control unit 12 will be described. As shown in FIG. 1, the control unit 12 includes, as executable functions, a music player processing unit 12A, a navigation processing unit 12B, a hands-free telephone processing unit 12C, a TM (terminal mode) processing unit 12D, and a stop function selection processing unit. 12E is included. A part of each of these processing units is a function realized by executing an application program added to the memory 20 by the user.

  The music player processing unit 12A sends an instruction to the audio processing unit 22 to reproduce the music data read from the memory 20. The navigation processing unit 12B reads the map data from the memory 20 (or obtains the map data by communication from a map server (not shown)), displays a map image around the vehicle position, or meets predetermined conditions. Perform navigation operations to search for facilities. The hands-free telephone processing unit 12 </ b> C performs display and designation of a call partner using a display unit and an operation unit (both not shown) provided in the in-vehicle device 50, and calls using the telephone processing unit 18 of the mobile terminal device 10. Perform hands-free processing.

  The TM processing unit 12D performs processing corresponding to the terminal mode. This terminal mode (Terminal Mode) is an interface standard defined by CE4A (Consumer Electronics for Automotive), a standardization organization for an interface between an in-vehicle electronic control unit (ECU) and a portable device. When the mobile terminal device 10 operates in the terminal mode, the same screen as the display screen of the mobile terminal device 10 is also displayed on the in-vehicle device 50, and various operations using the touch panel 13B of the mobile terminal device 10 are provided in the in-vehicle device 50. The same operation can be performed using a touch panel.

  The stop function selection processing unit 12E performs a process for the user to specify a function with a low priority in which the execution of the function is preferentially stopped or the operation is restricted. That is, in this embodiment, when it is determined by the discharge determination unit 34A that the discharge is performed, the execution of a function having a predetermined low priority is stopped or its operation is limited. It is possible to change the order of stopping or restricting the operation of each function according to a user instruction. For example, a setting screen including a plurality of functions subject to function stop or operation restriction is created and displayed on the display unit 15, and the user uses the touch panel 13 </ b> B or the operation unit 13 </ b> A to select each function in the order of lower priority. When selected, priority is set in this selection order.

  The control unit 12 and the display processing unit 16 are stopped as a function execution unit, the charging circuit 32 as a charging unit, the discharge determination unit 34A as a first discharge determination unit, and the function stop instruction unit 34B as a function stop instruction unit. The function selection processing unit 12E corresponds to the stop function selection unit, and the USB interface unit 26 corresponds to the interface unit.

  The portable terminal device 10 of this embodiment has such a configuration, and next, an operation for performing charging control on the secondary battery 30 will be described. The maximum current supplied through the USB cable is 0.5A, and when multiple functions are executed in parallel and the power consumption exceeds this value, the secondary battery 30 is discharged even if charging power is supplied. It becomes a state. In the present embodiment, in order to avoid such a situation, when the secondary battery 30 is in a discharged state, the function is stopped or the operation of the function is restricted in order of increasing priority.

  FIG. 2 is a flowchart showing an operation procedure for stopping the function or restricting the operation as necessary during the charging operation. The discharge determination unit 34A determines whether or not charging of the secondary battery 30 by the charging circuit 32 is started when the USB cable is connected to the USB interface unit 26 and charging power is supplied from the in-vehicle device 50 (step 100). If charging is not started, a negative determination is made and this determination is repeated.

  In addition, when charging is started, an affirmative determination is made in the determination in step 100, and then the charging determination unit 34A detects the initial charge amount (remaining battery amount) of the secondary battery 30 (step 102). . Thereafter, the discharge determination unit 34A determines whether or not the time T (for example, 5 minutes) has elapsed (step 104). If the time T has not elapsed, a negative determination is made, and the discharge determination unit 34A Whether or not (step 106). If it is not the end of charging, a negative determination is made, and the process returns to step 104 and the determination of the elapse of time T is repeated. Further, when a predetermined time has elapsed, an affirmative determination is made in the determination in step 104, and the discharge determination unit 34A detects the amount of charge of the secondary battery 30 again (step 108).

  Next, the discharge determination unit 34A determines whether or not the charge amount of the secondary battery 30 is decreased based on the two charge amounts detected at predetermined time intervals, that is, whether or not the secondary battery 30 is discharged. Is determined (step 110). If it has not decreased (when the remaining battery level has increased due to charging), a negative determination is made, and the process returns to step 104 and the operations after the elapse of time T are repeated.

  If the charge amount of the secondary battery 30 is decreasing, an affirmative determination is made in the determination of step 110. Next, the function stop instruction unit 34B selects a function with the lowest priority from the functions that are currently being executed and can be stopped or restricted, and the control unit 12 determines whether to stop or restrict the function. Alternatively, the display control unit 16 is instructed (step 112).

  For example, when the mobile terminal device 10 is operating in the terminal mode, the same content as the screen displayed on the display unit 15 is also displayed on the in-vehicle device 50. In this case, it is considered that there is no problem even if the lighting of the backlight provided in the mobile terminal device 10 is stopped. Accordingly, assuming that the priority order corresponding to the backlight lighting operation is set to the lowest, when the mobile terminal device 10 is operating in the terminal mode, the instruction in step 112 is displayed from the function stop instruction unit 34B. It is sent to the processing unit 16, and the lighting of the backlight is stopped. When the priority order corresponding to the backlight lighting operation is set to the lowest, and the portable terminal device 10 is not operating in the terminal mode, the instruction in step 112 is displayed from the function stop instruction unit 34B. Control is performed to reduce the luminance of the backlight.

  Further, during the navigation operation by the navigation processing unit 12B, the map data is frequently read and the map image drawing process is performed, so that the operation rate of the CPU becomes high, and it is considered that the power consumption during execution of this function is large. Considering this point, the priority order of the functions realized by the navigation processing unit 12B may be set low.

  Alternatively, since the portable terminal device 10 is connected to the in-vehicle device 50 via the USB cable during the charging operation of the secondary battery 30, a wireless function (Bluetooth connection function or wireless LAN connection) using the wireless interface unit 28 is used. The opportunity to use (function) is expected to decrease. Therefore, for these wireless functions, the priority may be set low when not used, and these wireless functions may be preferentially stopped.

  As described above, in the mobile terminal device 10 according to the present embodiment, when the discharge determination unit 34A determines that the discharge is performed, the execution of some functions with lower priority is stopped or the operation of this function is performed. Since the restriction is performed, it is possible to prevent the secondary battery 30 from being discharged during the charging operation by performing a plurality of functions and excessive power consumption, and maintain the functions as much as possible. However, the secondary battery 30 can be reliably charged.

  In addition, the processing can be simplified by determining the priorities of the plurality of functions described above in advance. Further, this order can be arbitrarily changed by the user, and the functions desired by the user can be reliably maintained.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in the first embodiment described above, when the secondary battery 30 is discharged (when an affirmative determination is made in step 110 in FIG. 2), the function stop instruction unit 34B issues a function stop or operation limit instruction. However, as shown in FIG. 3, when the secondary battery 30 is discharged, the discharge determination unit 34 </ b> A further sets the charge amount (remaining battery capacity) of the secondary battery 30 to a reference value (for example, (A value of 30% of the amount of charge at full charge) or less (step 111), and if it is less than the reference value, the function stop instruction unit 34B issues a function stop or operation restriction instruction (step 112). You may make it perform. As a result, even if the power consumption of the mobile terminal device 10 is excessive, if the charge amount (remaining battery power) of the secondary battery 30 is sufficient, the function being executed can be maintained. .

  In the first embodiment described above, the case where the charging power is supplied via the USB cable has been described. However, the present invention can also be applied to the case where the charging power is supplied via another cable. it can. Alternatively, charging power may be supplied via an AC adapter. Even in this case, the secondary battery 30 is discharged when power is consumed in excess of the maximum supplyable current, so that the secondary battery 30 can be reliably charged by applying the present invention. become.

  Further, in the first embodiment described above, the present invention is applied to the mobile terminal device 10. However, if a plurality of functions can be executed and at least a part of the functions can be stopped or restricted, other mobile phones can be used. The present invention can also be applied to devices. Further, the device to which the mobile device is connected is not limited to the in-vehicle device 50, and may be another device (for example, a personal computer).

(Second Embodiment)
By the way, in 1st Embodiment mentioned above, in the portable terminal device 10, it was determined whether the secondary battery 30 was discharging, and the countermeasure of discharge prevention was taken, However, The same determination and countermeasure may be performed in a vehicle-mounted apparatus. It may be.

  FIG. 4 is a diagram illustrating an overall configuration of the in-vehicle system according to the second embodiment. The in-vehicle system shown in FIG. 4 includes a mobile terminal device 10 and an in-vehicle device 150 that are connected to each other. The mobile terminal device 10 is the same as the mobile terminal device 10 shown in FIG.

  The in-vehicle device 150 transmits / receives various data to / from the mobile terminal device 10, performs an operation linked with the mobile terminal device 10, and independently performs a predetermined process regardless of whether the mobile terminal device 10 is connected. The action can be performed. The in-vehicle device 150 includes a control unit 52, an operation unit 53A, a touch panel 53B, an input processing unit 54, a display unit 55, a display processing unit 56, an audio processing unit 58, an amplifier 59, a speaker 60, a USB interface unit (USB I / F). 62).

  The control unit 52 is for controlling the entire in-vehicle device 150, and is realized by executing a predetermined program stored in the ROM or RAM by the CPU. Details of the control unit 52 will be described later. The operation unit 53A includes various keys, switches, operation knobs, and the like provided in the housing of the in-vehicle device 150. The touch panel 53B detects the indicated position when a part of the screen of the display unit 55 is pointed by the user. The user can perform various operation instructions and various inputs using the touch panel 53B or the operation unit 53A. The input processing unit 54 monitors the operation content of the operation unit 53A and the touch panel 53B, and detects the operation content by the user. The display unit 55 is configured by an LCD or the like. The display processing unit 56 displays an operation screen including a plurality of operation icons and a screen created by the control unit 52 on the display unit 55.

  The audio processing unit 58 is for reproducing music data, and performs audio decoding processing for each data format and outputs an audio signal. This audio signal is amplified by the amplifier 59 and output from the speaker 60. The USB interface unit 62 is for inputting and outputting signals between the in-vehicle device 150 as a USB host and the mobile terminal device 10 as a USB device, and includes a USB host controller.

  The control unit 52 includes a vehicle state detection unit 100, a vehicle state transmission unit 102, a TM (terminal mode) processing unit 104, a discharge determination unit 110, and an access frequency change unit 112.

  The vehicle state detection unit 100 detects a vehicle state. The vehicle state includes at least one of vehicle speed, gyro output value, steering wheel steering angle, GPS output value, atmospheric pressure, temperature, travel distance, average fuel consumption, and the like. In the present embodiment, it is assumed that data indicating the vehicle state is transmitted from the in-vehicle device 150 to the mobile terminal device 10, and any vehicle state other than that illustrated is detected as long as it is a transmission target. May be included.

  The vehicle state transmission unit 102 transmits data indicating the vehicle state detected by the vehicle state detection unit 100 to the mobile terminal device 10 via the USB interface unit 62. This data transmission is repeated at a predetermined time angle. For example, in the normal mode (a power saving mode described later exists in addition to the normal mode), data indicating the vehicle state is transmitted to the mobile terminal device 10 at a frequency of once every 50 msec.

  When the mobile terminal device 10 operates in the terminal mode, the TM processing unit 104 performs a specific operation corresponding to this (operation of the terminal device operating in the terminal mode). For example, the touch panel 53B is used to perform a process of displaying a screen having the same content when image data indicating the display content of the mobile terminal device 10 is sent, or an operation similar to the operation using the touch panel 13B of the mobile terminal device 10. The TM processing unit 104 performs processing realized in this way.

  The discharge determination unit 110 monitors the amount of charge (remaining battery level) of the secondary battery 30 provided in the mobile terminal device 10 and determines whether or not the secondary battery 30 is discharged during the charging operation by the charging circuit 32. To do. The access frequency changing unit 112 reduces the frequency of data transmission / reception with the mobile terminal device 10 when the discharge determining unit 110 determines that the battery is discharging. For example, an instruction is sent to the vehicle state transmission unit 102 to change the data transmission frequency “once in 50 msec” in the normal mode to “once in 100 msec” which is the data transmission frequency in the power saving mode. The above-described discharge determination unit 110 corresponds to the second discharge determination unit, and the access frequency change unit 112 corresponds to the transmission / reception frequency change unit.

  The in-vehicle device 150 of the present embodiment has such a configuration, and next, an operation for restricting access on the in-vehicle device 150 side in order to suppress discharge of the secondary battery 30 of the mobile terminal device 10 will be described. To do.

  FIG. 5 is a flowchart showing an operation procedure for performing access restriction on the in-vehicle device 150 side. The discharge determination unit 110 determines whether or not charging of the secondary battery 30 by the charging circuit 32 is started when a USB cable is connected to the USB interface unit 62 and charging power is supplied toward the mobile terminal device 10 (step S100). 200). If charging is not started, a negative determination is made and this determination is repeated. In addition, instead of checking whether or not the charging of the secondary battery 30 has actually started, it is detected that the mobile terminal device 10 has been connected via the USB cable and the charging of the secondary battery 30 has started. It is good.

  In addition, when charging is started, an affirmative determination is made in the determination in step 200, and then the charging determination unit 110 detects the initial charge amount (remaining battery amount) of the secondary battery 30 (step 202). . The detection of the charge amount in this step or step 208 described later is performed, for example, by making an inquiry to the discharge determination unit 34A of the mobile terminal device 10 and based on the charge amount data sent in response to this inquiry.

  Thereafter, the discharge determination unit 110 determines whether or not the time T (for example, 5 minutes) has elapsed (step 204). If the time T has not elapsed, a negative determination is made, and the discharge determination unit 110 ends the charging. Whether or not (step 206). If it is not the end of charging, a negative determination is made, the process returns to step 204, and the determination of the elapse of time T is repeated. In addition, when a predetermined time has elapsed, an affirmative determination is made in the determination in step 204, and the discharge determination unit 110 detects the charge amount of the secondary battery 30 again (step 208).

  Next, the discharge determination unit 110 determines whether or not the charge amount of the secondary battery 30 is decreased based on the two charge amounts detected at predetermined time intervals, that is, whether or not the secondary battery 30 is discharged. Is determined (step 210). If it has not decreased (when the remaining battery level has increased due to charging), a negative determination is made, and the process returns to step 204 and the operations after the elapse of time T are repeated.

  On the other hand, if the charge amount is decreasing, an affirmative determination is made in the determination of step 210. Next, the discharge determination unit 110 determines whether or not the charge amount of the secondary battery 30 is equal to or less than a reference value (for example, a value of 30% of the charge amount when fully charged) (step 211). If the amount of charge is greater than the reference value, a negative determination is made, and the process returns to step 204 and the operations after the elapse of time T are repeated.

  If the charge amount of the secondary battery 30 is equal to or less than the reference value, an affirmative determination is made in the determination of step 211. Next, the access frequency changing unit 112 sends an instruction to the vehicle state transmitting unit 102 to change the data transmission frequency in the normal mode to the data transmission frequency in the power saving mode (step 212).

  As described above, in the in-vehicle system of the present embodiment, the secondary battery 30 is prevented from being discharged during the charging operation by performing a predetermined function involving data transmission / reception and excessive power consumption. The secondary battery 30 can be reliably charged while maintaining the function as much as possible.

  For example, various data necessary for navigation processing such as a vehicle speed, a gyro output value, a steering wheel steering angle, and a GPS output value are transmitted from the in-vehicle device 150 as a vehicle state, and the navigation processing unit 12B in the mobile terminal device 10 transmits these data. A case where a navigation operation such as display of a map image around the vehicle position is received is considered. In such a case, when the navigation processing unit 12B performs a navigation operation based on this data when data is sent from the in-vehicle device 150, data transmission from the in-vehicle device 150 to the portable terminal device 10 is performed. By reducing the frequency, the frequency of processing by the navigation processing unit 12B can be reduced to suppress power consumption.

  Further, in combination with the operation of reducing the data transmission frequency by the in-vehicle device 150, in combination with the control (the operation of the first embodiment) for suppressing the power consumption by the mobile terminal device 10 itself, the secondary battery is further combined. 30 discharges can be effectively prevented. For example, consider a case where the navigation processing unit 12B described above accesses a map server as an external server at a predetermined interval via a predetermined network to acquire map data and other data. When the secondary battery 30 is discharging, or when discharging is performed and the amount of charge falls below a reference value, the access frequency in the normal mode (for example, once every 500 msec) is changed to the access frequency in the power saving mode (for example, , Once every 1000 msec), the power consumption of the mobile terminal device 10 can be further reduced.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in the second embodiment described above, when the secondary battery 30 is discharged (affirmative determination at step 210 in FIG. 5) and the charge amount is equal to or less than the reference value (affirmative determination at step 211 in FIG. 5). Although the access frequency (data transmission frequency) is decreased by the access frequency changing unit 112, the determination at step 211 may be omitted and the access frequency may be decreased when the secondary battery 30 is being discharged.

  In the second embodiment described above, the case where data is transmitted / received and the charging power is supplied via the USB cable has been described. However, the case where data is transmitted / received and the charging power is supplied via another cable. The present invention can also be applied to. Further, the charging power may be supplied by other means such as an AC adapter. Even in this case, the secondary battery 30 is discharged when power is consumed in excess of the maximum supplyable current, so that the secondary battery 30 can be reliably charged by applying the present invention. become.

  As described above, according to the present invention, it is possible to prevent the secondary battery from being discharged during the charging operation by performing a plurality of functions and causing excessive power consumption. The secondary battery can be reliably charged while maintaining the function.

DESCRIPTION OF SYMBOLS 10 Portable terminal device 12,52 Control part 12A Music player process part 12B Navigation process part 12C Hands-free telephone process part 12D, 104 TM process part 12E Stop function selection process part 13A, 53A Operation part 13B, 53B Touch panel 14,54 Input process Unit 15, 55 Display unit 16, 56 Display processing unit 26, 62 USB interface unit (USB I / F)
28 Wireless interface unit (wireless I / F)
DESCRIPTION OF SYMBOLS 30 Secondary battery 31 Power supply circuit 32 Charging circuit 34 Charge control circuit 34A, 110 Discharge determination part 34B Function stop instruction part 50, 150 In-vehicle apparatus 100 Vehicle state detection part 102 Vehicle state transmission part 112 Access frequency change part

Claims (15)

Function execution means for executing a plurality of functions, each of which can be started, stopped, or restricted in operation, each of which has a priority set;
A secondary battery for supplying power necessary for executing the function by the function executing means;
Charging means for charging the secondary battery using charging power supplied from the outside;
First discharge determination means for determining whether or not the secondary battery is discharged during the charging operation by the charging means;
Function stop that instructs the function execution means to stop the execution of some functions with lower priority or to restrict the operation of this function when the first discharge determination means determines that the discharge is performed Instruction means;
A portable device comprising: In claim 1,
A priority order of each of the plurality of functions is determined in advance. In claim 2,
Among the plurality of functions, when the first discharge determination means determines that the discharge is performed, the function with lower priority is used so that the execution of the function is stopped or the operation is preferentially performed. A portable device further comprising stop function selection means designated by a person. In any one of Claims 1-3,
It further includes interface means connected to an external device via a predetermined cable, and transmitting / receiving data to / from each other via this cable,
Charging the secondary battery by the charging means is performed using charging power supplied from the external device via the cable. In any one of Claims 1-4,
The portable device is characterized in that the cable is a USB cable, and the interface means conforms to the USB standard. In any one of Claims 1-5,
The plurality of functions include a lighting operation of a backlight used for display,
The portable device, wherein the function stop instruction means instructs to turn off the backlight or to lower the luminance. In any one of Claims 1-6,
The plurality of functions include at least one of a Bluetooth connection function and a wireless LAN connection function,
The said function stop instruction | indication means instruct | indicates the stop of these connection functions, when these connection functions are unused. In any one of Claims 1-7,
The function stop instructing means determines the function when the first discharge determining means determines that the battery is discharged and the charge amount of the secondary battery is lower than a reference value. A portable device characterized by instructing execution stop or operation restriction to the function execution means. An in-vehicle system including the portable device according to claim 4 and the external device,
The external device is
Second discharge determination means for determining whether or not the secondary battery is discharged during the charging operation by the charging means;
A transmission / reception frequency changing means for reducing a data transmission / reception frequency with the portable device when the second discharge determination means determines that the discharge is performed;
An in-vehicle system comprising: An in-vehicle system in which a portable device is connected to an in-vehicle device via a predetermined cable, and data is transmitted and received between the in-vehicle device and the portable device,
The portable device includes a function execution unit that executes a predetermined function using data transmitted from the in-vehicle device, a secondary battery that supplies power necessary for executing the function by the function execution unit, and an external device. Charging means for charging the secondary battery using the supplied charging power,
The on-vehicle device has a second discharge determination unit that determines whether or not the secondary battery is discharged during the charging operation by the charging unit, and a determination that the second discharge determination unit is discharging And a transmission / reception frequency changing means for reducing a transmission / reception frequency of data to / from the mobile device. In claim 10,
The transmission / reception frequency changing means lowers the transmission / reception frequency by increasing the interval at which data is transmitted / received to / from the portable device when the second discharge determination means determines that the discharge has occurred. An in-vehicle system characterized by this. In claim 10 or 11,
Charging of the secondary battery by the charging means is performed using charging power supplied from the in-vehicle device via the cable. In any one of Claims 10-12,
The in-vehicle system, wherein the cable is a USB cable. In any one of Claims 9-13,
The portable device further includes communication means for performing communication with an external server connectable via a predetermined network,
The function execution means reduces the frequency of communication with the external server using the communication means when the second discharge determination means determines that the discharge is performed. In-vehicle system. In any one of Claims 9-14,
The transmission / reception frequency changing means transmits / receives the data when the second discharge determination means determines that the battery is discharged and the charge amount of the secondary battery is lower than a reference value. An in-vehicle system characterized by lowering the frequency.

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