WO2021019666A1 - Power supply control apparatus, vehicle-mounted information device, and power supply control method - Google Patents

Power supply control apparatus, vehicle-mounted information device, and power supply control method Download PDF

Info

Publication number
WO2021019666A1
WO2021019666A1 PCT/JP2019/029766 JP2019029766W WO2021019666A1 WO 2021019666 A1 WO2021019666 A1 WO 2021019666A1 JP 2019029766 W JP2019029766 W JP 2019029766W WO 2021019666 A1 WO2021019666 A1 WO 2021019666A1
Authority
WO
WIPO (PCT)
Prior art keywords
power supply
dark current
temperature
supply control
unit
Prior art date
Application number
PCT/JP2019/029766
Other languages
French (fr)
Japanese (ja)
Inventor
政幸 橋本
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2019/029766 priority Critical patent/WO2021019666A1/en
Publication of WO2021019666A1 publication Critical patent/WO2021019666A1/en

Links

Images

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3206—Monitoring of events, devices or parameters that trigger a change in power modality
    • G06F1/3215—Monitoring of peripheral devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3234—Power saving characterised by the action undertaken
    • G06F1/3287—Power saving characterised by the action undertaken by switching off individual functional units in the computer system

Definitions

  • the present invention relates to a power supply control device, an in-vehicle information device, and a power supply control method.
  • OS operating system
  • ANDROID registered trademark
  • Linux registered trademark
  • WINDOWS registered trademark
  • ACC power supply When the accessory power supply (hereinafter sometimes referred to as "ACC power supply”) is turned on, various functions by the OS are executed. At this time, electric power is consumed by consuming current by the in-vehicle information device.
  • the consumed power is supplied by, for example, a constant power source (hereinafter, may be referred to as "+ B power source”).
  • the dark current includes a leak current due to a passive element in an in-vehicle information device.
  • the passive element is composed of, for example, an electrolytic capacitor.
  • this dark current may be referred to as a "first dark current”.
  • the dark current includes the current for holding the information stored in the volatile memory in the in-vehicle information device.
  • the volatile memory is composed of, for example, a DRAM (Dynamic Random Access Memory) or a SRAM (Static Random Access Memory). Volatile memory is used for each function by the OS.
  • this dark current may be referred to as a "second dark current”.
  • the dark current includes a current for operating an IC (Integrated Circuit) in an in-vehicle information device at a low speed.
  • the IC includes, for example, a microcontroller (hereinafter referred to as "microcomputer") and a SoC (System-on-a-Chip).
  • microcomputer microcontroller
  • SoC System-on-a-Chip
  • Each function by the OS is realized by, for example, SoC.
  • this dark current may be referred to as a "third dark current”.
  • the dark current in the in-vehicle information device from the viewpoint of achieving both high-speed restart of the in-vehicle information device and avoidance of battery exhaustion. Further, it is preferable to control the on / off of the second dark current and the third dark current based on the detected dark current. More specifically, it is preferable to control the stop timing of the second dark current and the third dark current based on the detected dark current.
  • Patent Document 1 discloses a technique for detecting a dark current in an in-vehicle information device.
  • the technique described in Patent Document 1 uses a dedicated sensor (dark current sensor SN2) for detecting dark current. This sensor has a problem of increasing the manufacturing cost of an in-vehicle information device.
  • the present invention has been made to solve the above problems, and an object of the present invention is to eliminate the need for a dedicated sensor for detecting dark current.
  • the power supply control device of the present invention uses a temperature information acquisition unit that acquires temperature information indicating a temperature in an in-vehicle information device and a dark current estimation that estimates a dark current in an in-vehicle information device based on the temperature using the temperature information. It is provided with a unit and a power supply control unit that executes control for setting the power supply circuit in the in-vehicle information device to the off state according to the estimation result by the dark current estimation unit.
  • FIG. It is a block diagram which shows the main part of the vehicle-mounted information device which concerns on Embodiment 1.
  • FIG. It is a block diagram which shows the main part of the power supply control apparatus which concerns on Embodiment 1.
  • FIG. It is a characteristic diagram which shows the example of the temperature dark current characteristic in an in-vehicle information device. It is explanatory drawing which shows the example of the time change of temperature in an in-vehicle information device. It is explanatory drawing which shows the example of the time change of a dark current in an in-vehicle information device. It is explanatory drawing which shows the example of the time change of the power consumption in an in-vehicle information device.
  • FIG. It is a flowchart which shows the operation of the power-source control apparatus which concerns on Embodiment 1.
  • FIG. It is a block diagram which shows the main part of another power supply control device which concerns on Embodiment 1.
  • FIG. It is a block diagram which shows the main part of another power supply control device which concerns on Embodiment 1.
  • FIG. It is a block diagram which shows the main part of another power supply control device which concerns on Embodiment 1.
  • FIG. It is a block diagram which shows the main part of the in-vehicle information device which concerns on Embodiment 2.
  • It is a block diagram which shows the main part of the power supply control device which concerns on Embodiment 2.
  • It is a flowchart which shows the operation of the power-source control device which concerns on Embodiment 2.
  • FIG. 1 is a block diagram showing a main part of an in-vehicle information device according to the first embodiment.
  • the vehicle-mounted information device according to the first embodiment will be described with reference to FIG.
  • the solid arrows between the blocks in FIG. 1 correspond to signals or information.
  • the dashed arrows between the blocks in FIG. 1 correspond to electric power or current.
  • the in-vehicle information device 300 is mounted on the vehicle 1.
  • the vehicle 1 has an accessory power supply 2.
  • the vehicle 1 has an in-vehicle network 3.
  • the in-vehicle network 3 is configured by, for example, CAN (Control Area Network).
  • the vehicle 1 has a constant power supply 4.
  • the constant power supply 4 is electrically connected to the vehicle-mounted battery 5.
  • the vehicle-mounted battery 5 is mounted on the vehicle 1.
  • the in-vehicle information device 300 has a clock 11. Further, the in-vehicle information device 300 has a thermometer 12. The thermometer 12 measures the temperature Temp in the in-vehicle information device 300.
  • the thermometer 12 is composed of, for example, a thermistor.
  • the temperature measured by the thermometer 12 (hereinafter sometimes referred to as "measured temperature") Temp is used for controlling a part or function having a temperature dependence in the in-vehicle information device 300.
  • the measurement temperature Temp is used for controlling the time in the clock 11.
  • the measurement temperature Temp is used for controlling the laser diode in the optical pickup.
  • the measurement temperature Temp is used for controlling the liquid crystal display.
  • the in-vehicle information device 300 has a processor 13 for power supply control.
  • the processor 13 is composed of, for example, a microcomputer.
  • the processor 13 constitutes a main part of the power supply control device 100.
  • the power supply control device 100 will be described later with reference to FIG.
  • the in-vehicle information device 300 has a processing circuit 14. Further, the in-vehicle information device 300 has a volatile memory 15.
  • the processing circuit 14 is composed of, for example, SoC.
  • the memory 15 is composed of, for example, a DRAM or an SRAM.
  • the processing circuit 14 and the memory 15 form a main part of the information processing apparatus 200.
  • the information processing device 200 has an OS.
  • the OS for example, ANDROID (registered trademark), Linux (registered trademark) or WINDOWS (registered trademark) is used.
  • Each function by the OS is realized by the processing circuit 14. Further, the memory 15 is used for each function by the OS.
  • the information processing device 200 consumes less power than the power consumption in the activated state in addition to the activated state (hereinafter referred to as “started state”) and the stopped state (hereinafter referred to as “shutdown state”). It has a state of standby by electric power (hereinafter referred to as “power saving standby state”).
  • the information processing device 200 is selectively set to a start state, a shutdown state, or a power saving standby state by the power control device 100.
  • the power supply control device 100 will be described later with reference to FIG.
  • the activation state corresponds to, for example, the state of S0 in ACPI (Advanced Configuration and Power Interface).
  • the shutdown state corresponds to, for example, the state of S5 in ACPI.
  • the power saving standby state corresponds to, for example, the state of S1, S2, S3 or S4 in ACPI. That is, the power saving standby state corresponds to the so-called “suspend state", "standby state", or "sleep state”.
  • the in-vehicle information device 300 has a power supply circuit 16. More specifically, the in-vehicle information device 300 has two power supply circuits 16_1 and 16_2.
  • first power supply circuit 16_1 of the two power supply circuits 16_1 and 16_2 supplies electric power to the clock 11 and the processor 13. This electric power is, for example, always supplied by the power source 4.
  • the first power supply circuit 16_1 is composed of, for example, a linear regulator.
  • the other one of the two power supply circuits 16_1 and 16_2 (hereinafter referred to as "second power supply circuit") 16_2 supplies electric power to the processing circuit 14 and the memory 15. This electric power is, for example, always supplied by the power source 4.
  • the second power supply circuit 16_2 is composed of, for example, a linear regulator.
  • the first power supply circuit 16_1 and the second power supply circuit 16_2 supply electric power to different parts of the in-vehicle information device 300.
  • Each of the first power supply circuit 16_1 and the second power supply circuit 16_2 is selectively set to an on state or an off state by the power supply control device 100.
  • the power supply control device 100 will be described with reference to FIG.
  • the power supply control device 100 When the accessory power supply 2 is turned on, the power supply control device 100 acquires a signal indicating that fact. Further, when the accessory power supply 2 is turned off, the power supply control device 100 acquires a signal to that effect. These signals are obtained from, for example, the accessory power supply 2 or the vehicle-mounted network 3. The power control device 100 has a function of determining whether the accessory power supply 2 is on or off by using these signals.
  • the power supply control device 100 has a function of setting the information processing device 200 to the power saving standby state when the accessory power supply 2 is turned off. As a result, the information processing apparatus 200 switches from the activated state to the power saving standby state.
  • the power supply control device 100 has a function of setting the information processing device 200 to the shutdown state when the second power supply circuit 16_2 is set to the off state while the accessory power supply 2 is off. .. As a result, the information processing apparatus 200 switches from the power saving standby state to the shutdown state.
  • the power supply control device 100 has a function of setting the information processing device 200 to the activated state when the accessory power supply 2 is turned on. As a result, the information processing apparatus 200 switches from the power saving standby state or the shutdown state to the startup state.
  • the time required to switch from the power saving standby state to the start state is shorter than the time required to switch from the shutdown state to the start state.
  • these times may be collectively referred to as "restart time”. That is, the restart time from the power saving standby state is shorter than the restart time from the shutdown state.
  • the power supply control device 100 has the following functions.
  • the temperature information acquisition unit 21 acquires information indicating the measurement temperature Temp (hereinafter referred to as "temperature information") in a state where the accessory power supply 2 is turned off.
  • the temperature information is acquired from the thermometer 12.
  • the temperature information is acquired every T for a predetermined time (for example, 10 seconds).
  • a clock 11 is used for counting the predetermined time T.
  • the dark current estimation unit 22 estimates the dark current I in the in-vehicle information device 300 based on the measured temperature Temp using the temperature information acquired by the temperature information acquisition unit 21.
  • the characteristic C indicating the dark current I with respect to the temperature Temp in the in-vehicle information device 300 is referred to as the "temperature dark current characteristic”.
  • FIG. 3 shows an example of the temperature dark current characteristic C.
  • the dark current I gradually increases as the temperature Temp increases. Therefore, the dark current estimation unit 22 stores information indicating the temperature dark current characteristic C (hereinafter, referred to as “temperature dark current characteristic information”) in advance.
  • the dark current estimation unit 22 estimates the dark current I based on the measured temperature Temp and the temperature dark current characteristic C by using the acquired temperature information and the temperature dark current characteristic information stored in advance.
  • the power consumption calculation unit 23 integrates the dark current I estimated by the dark current estimation unit 22 over time. As a result, the power consumption calculation unit 23 calculates the integrated value (hereinafter referred to as “power consumption”) P of the power consumption when the accessory power supply 2 is turned off. That is, the power consumption P indicates the integrated value of the power consumption due to the dark current I.
  • the power consumption calculation unit 23 sets the value of the power consumption P to a predetermined initial value (that is, 0) when the accessory power supply 2 is turned off. With the accessory power supply 2 turned off, the power consumption calculation unit 23 uses the following equation (1) to calculate the power consumption P every predetermined time T, that is, every time the dark current I is estimated. To update. As a result, the power consumption P is calculated.
  • FIG. 4 shows an example of the time change of the temperature Temp when the accessory power supply 2 is turned off.
  • FIG. 5 shows an example of the time change of the dark current I in the state where the accessory power supply 2 is turned off.
  • FIG. 6 shows an example of the time change of the power consumption P in the state where the accessory power supply 2 is turned off.
  • the horizontal axis in each of FIGS. 4, 5 and 6 indicates the elapsed time with respect to the time when the accessory power supply 2 is turned off (0 in the figure).
  • the correspondence between the temperature Temp shown in FIG. 4 and the dark current I shown in FIG. 5 is based on the temperature dark current characteristic C shown in FIG. Further, the power consumption P shown in FIG. 6 is obtained by time-integrating the dark current I shown in FIG.
  • the power consumption comparison unit 24 compares the power consumption P calculated by the power consumption calculation unit 23 with a predetermined threshold value Th. As a result, the power consumption comparison unit 24 determines whether or not the power consumption P is equal to or greater than the threshold value Th.
  • the threshold value Th is set to, for example, a value obtained by multiplying the initial value of the battery capacity of the vehicle-mounted battery 5 by a predetermined coefficient. This coefficient is greater than 0 and less than 1.
  • the power supply control unit 25 executes control for setting the second power supply circuit 16_2 to the off state when the power consumption amount comparison unit 24 determines that the power consumption amount P is equal to or higher than the threshold value Th. As a result, the second power supply circuit 16_2 is switched from the on state to the off state. At this time, the information processing apparatus 200 switches from the power saving standby state to the shutdown state as described above.
  • the power supply control unit 25 executes control for setting the second power supply circuit 16_2 to the on state when the accessory power supply 2 is turned on and the second power supply circuit 16_2 is set to the off state. .. As a result, the second power supply circuit 16_2 is switched from the off state to the on state. At this time, the information processing apparatus 200 switches from the shutdown state to the startup state as described above.
  • the power supply control unit 25 always executes control for setting the first power supply circuit 16_1 to the ON state. That is, the power supply control unit 25 executes control for setting the first power supply circuit 16_1 to the on state regardless of whether the accessory power supply 2 is on or off. ..
  • the circuit scale of the processor 13 is smaller than the circuit scale of the processing circuit 14 and the memory 15. Therefore, the dark current in the processor 13 is smaller than the dark current in the processing circuit 14 and the memory 15. Therefore, it is unlikely that the battery will run out because the first power supply circuit 16_1 is set to the on state while the accessory power supply 2 is off. Further, usually, the importance of the function by the clock 11 (for example, the timekeeping function) is higher than the importance of the function by the OS (for example, the display function). Therefore, the power supply control unit 25 sets the first power supply circuit 16_1 to the on state not only when the accessory power supply 2 is turned on but also when the accessory power supply 2 is turned off.
  • the main part of the power supply control device 100 is composed of the temperature information acquisition unit 21, the dark current estimation unit 22, the power consumption calculation unit 23, the power consumption comparison unit 24, and the power supply control unit 25.
  • the operation of the power supply control device 100 will be described with reference to the flowchart of FIG. 7, focusing on the operation in the state where the accessory power supply 2 is turned off. That is, the operations of the temperature information acquisition unit 21, the dark current estimation unit 22, the power consumption calculation unit 23, the power consumption comparison unit 24, and the power supply control unit 25 will be mainly described.
  • the power supply control device 100 executes control for setting the information processing device 200 to the power saving standby state.
  • the information processing apparatus 200 switches from the activated state to the power saving standby state.
  • the process of step ST1 is executed.
  • step ST1 the power consumption calculation unit 23 sets the value of the power consumption P to a predetermined initial value (that is, 0).
  • step ST2 the power supply control device 100 waits for a predetermined time (for example, 10 seconds).
  • step ST3 the temperature information acquisition unit 21 acquires the temperature information.
  • the dark current estimation unit 22 estimates the dark current I based on the measured temperature Temp using the temperature information acquired in step ST3 (step ST4). More specifically, the dark current estimation unit 22 uses the acquired temperature information and the temperature dark current characteristic information stored in advance to generate the dark current I based on the measured temperature Temp and the temperature dark current characteristic C. presume.
  • the power consumption calculation unit 23 calculates the power consumption P based on the dark current I estimated in step ST4 (step ST5). More specifically, the power consumption calculation unit 23 updates the value of the power consumption P by the above formula (1).
  • the power consumption comparison unit 24 compares the power consumption P calculated in step ST5 with the threshold value Th (step ST6). As a result, the power consumption comparison unit 24 determines whether or not the power consumption P is equal to or greater than the threshold value Th.
  • step ST6 “NO”) the process of the power supply control device 100 proceeds to step ST2.
  • step ST6 “YES” the power supply control device 100 then executes a control for setting the information processing device 200 to the shutdown state.
  • the information processing apparatus 200 switches from the power saving standby state to the shutdown state.
  • the power supply control unit 25 executes control for setting the power supply circuit 16 to the off state (step ST7). More specifically, the power supply control unit 25 executes control for setting the second power supply circuit 16_2 to the off state. As a result, the second power supply circuit 16_2 is switched from the on state to the off state.
  • the power supply control device 100 When the accessory power supply 2 is turned on during the execution of the process shown in FIG. 7, that is, when the accessory power supply 2 is turned on before the execution of the process of step ST7, the power supply control device 100 performs the process shown in FIG. Suspend. Next, the power supply control device 100 executes control for setting the information processing device 200 to the activated state. As a result, the information processing device 200 switches from the power saving standby state to the activated state.
  • the power supply control unit 25 turns on the second power supply circuit 16_2. Executes the control set to. As a result, the second power supply circuit 16_2 is switched from the off state to the on state.
  • the power supply control device 100 executes control for setting the information processing device 200 to the activated state. As a result, the information processing apparatus 200 switches from the shutdown state to the startup state.
  • the temperature dark current characteristic information when estimating the dark current I, it is possible to consider the increase in the dark current I at high temperature. As a result, the dark current I can be accurately estimated regardless of the temperature Temp. As a result, the power consumption P can be calculated accurately.
  • the restart of the in-vehicle information device 300 can be speeded up and the occurrence of battery exhaustion can be avoided. It is possible to achieve both.
  • the processor 13 may have an operation mode (hereinafter referred to as "low-speed operation mode") having an operation speed lower than the operation speed in the normal operation mode in addition to the normal operation mode.
  • the processor 13 may operate in the low-speed operation mode when the accessory power supply 2 is turned off. As a result, the dark current in the power supply control device 100 can be reduced.
  • the power supply control unit 25 executes control for setting the second power supply circuit 16_2 to the off state when the power consumption amount comparison unit 24 determines that the power consumption amount P is equal to or higher than the threshold value Th.
  • the control for setting the first power supply circuit 16_1 to the off state may be executed.
  • the first power supply circuit 16_1 switches from the on state to the off state.
  • the power supply control unit 25 executes control for setting the first power supply circuit 16_1 to the on state.
  • the first power supply circuit 16_1 is switched from the off state to the on state.
  • control executed by the power supply control unit 25 may be a control in which at least one of the first power supply circuit 16_1 and the second power supply circuit 16_2 is set to the off state according to the estimation result by the dark current estimation unit 22. Just do it.
  • the functions of the temperature information acquisition unit 21, the dark current estimation unit 22, the power consumption calculation unit 23, and the power supply control unit 25 are realized by the processor 13, and the functions of the power consumption comparison unit 24 are realized by another processor (non-function). It may be realized by (illustration). That is, as shown in FIG. 8, even if the main part of the power supply control device 100 is composed of the temperature information acquisition unit 21, the dark current estimation unit 22, the power consumption calculation unit 23, and the power supply control unit 25. good.
  • the functions of the temperature information acquisition unit 21, the dark current estimation unit 22, and the power supply control unit 25 are realized by the processor 13, and the functions of the power consumption calculation unit 23 and the power consumption comparison unit 24 are other processors (non-function). It may be realized by (illustration). That is, as shown in FIG. 9, the main part of the power supply control device 100 may be configured by the temperature information acquisition unit 21, the dark current estimation unit 22, and the power supply control unit 25.
  • the power supply control device 100 is based on the temperature information acquisition unit 21 for acquiring the temperature information indicating the temperature Temp in the in-vehicle information device 300 and the temperature information based on the temperature Temp.
  • the dark current estimation unit 22 that estimates the dark current I in the vehicle-mounted information device 300 and the control that sets the power supply circuit 16 in the vehicle-mounted information device 300 to the off state are executed according to the estimation result by the dark current estimation unit 22. It includes a power supply control unit 25. This makes it possible to eliminate the need for a dedicated sensor for the amount of dark current detected. As a result, the manufacturing cost of the in-vehicle information device 300 can be reduced.
  • the dark current estimation unit 22 estimates the dark current I based on the temperature Temp and the temperature dark current characteristic C by using the temperature information and the temperature dark current characteristic information indicating the temperature dark current characteristic C in the in-vehicle information device 300. To do. As a result, the dark current I can be accurately estimated regardless of the temperature Temp.
  • the power supply control device 100 includes a power consumption calculation unit 23 that calculates the power consumption P of the in-vehicle information device 300 by time integration of the dark current I. Thereby, the control of the power supply circuit 16 according to the power consumption amount P can be realized.
  • the power supply control device 100 includes a power consumption comparison unit 24 that compares the power consumption P with the threshold Th, and the power control unit 25 turns off the power circuit 16 when the power consumption P is equal to or higher than the threshold Th. Set to state. As a result, it is possible to achieve both high-speed restart of the in-vehicle information device 300 and avoidance of battery exhaustion.
  • the in-vehicle information device 300 is an in-vehicle information device 300 including a power supply control device 100, and the power supply control device 100 acquires temperature information indicating a temperature Temp in the in-vehicle information device 300.
  • the dark current estimation unit 22 that estimates the dark current I in the in-vehicle information device 300 based on the temperature Temp, and the dark current estimation unit 22 that estimates the dark current I.
  • It has a power supply control unit 25 that executes control for setting the power supply circuit 16 in the in-vehicle information device 300 to an off state. This makes it possible to eliminate the need for a dedicated sensor for the amount of dark current detected. As a result, the manufacturing cost of the in-vehicle information device 300 can be reduced.
  • the temperature information acquisition unit 21 uses the temperature information in step ST3 for acquiring the temperature information indicating the temperature Temp in the in-vehicle information device 300, and the dark current estimation unit 22 uses the temperature information.
  • step ST4 which estimates the dark current I in the vehicle-mounted information device 300 based on the temperature Temp
  • the power supply control unit 25 determines the power supply circuit 16 in the vehicle-mounted information device 300 according to the estimation result by the dark current estimation unit 22.
  • Step ST7 which executes control for setting the temperature to the off state, is provided. This makes it possible to eliminate the need for a dedicated sensor for dark current detection. As a result, the manufacturing cost of the in-vehicle information device 300 can be reduced.
  • FIG. 10 is a block diagram showing a main part of the in-vehicle information device according to the second embodiment.
  • the vehicle-mounted information device according to the second embodiment will be described with reference to FIG.
  • the same blocks as those shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.
  • the in-vehicle information device 300a has a processor 13a.
  • the processor 13a is composed of, for example, a microcomputer.
  • the processor 13a constitutes a main part of the power supply control device 100a.
  • the clock 11, the thermometer 12, the power supply circuit 16, the power supply control device 100a, and the information processing device 200 constitute a main part of the in-vehicle information device 300a.
  • FIG. 11 the same blocks as those shown in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted.
  • the power consumption comparison unit 24a compares the power consumption P calculated by the power consumption calculation unit 23 with a predetermined threshold value (hereinafter, may be referred to as “first threshold value”) Th_1. As a result, the power consumption comparison unit 24a determines whether or not the power consumption P is equal to or greater than the first threshold value Th_1.
  • the power consumption comparison unit 24a compares the power consumption P calculated by the power consumption calculation unit 23 with another predetermined threshold value (hereinafter, may be referred to as “second threshold value”) Th_2. .. As a result, the power consumption comparison unit 24a determines whether or not the power consumption P is equal to or higher than the second threshold value Th_2.
  • the first threshold value Th_1 is set to a value equivalent to the threshold value Th in the power consumption comparison unit 24 shown in FIG. 2, for example.
  • the second threshold value Th_2 is set to a value larger than the first threshold value Th_1.
  • the first threshold value Th_1 and the second threshold value Th_2 are set to different values.
  • the power supply control unit 25a executes a control for setting the second power supply circuit 16_2 to the off state when the power consumption amount comparison unit 24a determines that the power consumption amount P is equal to or higher than the first threshold value Th_1. Further, the power supply control unit 25a executes a control for setting the first power supply circuit 16_1 to the off state when the power consumption amount comparison unit 24a determines that the power consumption amount P is equal to or higher than the second threshold value Th_2. is there.
  • the power consumption comparison unit 24a compares the power consumption P with a plurality of threshold values Th_1 and Th_2. Based on the result of the comparison, the power supply control unit 25a sequentially sets the plurality of power supply circuits 16_1 and 16_2 to the off state according to the increase in the power consumption amount P.
  • the importance of the function by the clock 11 (for example, the timekeeping function) is usually higher than the importance of the function by the OS (for example, the display function). Therefore, the timing at which the first power supply circuit 16_1 is set to the off state is delayed with respect to the timing at which the second power supply circuit 16_1 is set to the off state. Thereby, the stop timing of the power supply to the clock 11 can be delayed with respect to the stop timing of the power supply to the information processing apparatus 200.
  • the main part of the power supply control device 100a is composed of the temperature information acquisition unit 21, the dark current estimation unit 22, the power consumption calculation unit 23, the power consumption comparison unit 24a, and the power supply control unit 25a.
  • the operation of the power supply control device 100a will be described with reference to the flowchart of FIG. 12, focusing on the operation in the state where the accessory power supply 2 is turned off. That is, the operations of the temperature information acquisition unit 21, the dark current estimation unit 22, the power consumption calculation unit 23, the power consumption comparison unit 24a, and the power supply control unit 25a will be mainly described.
  • the power supply control device 100a executes a control for setting the information processing device 200 to the power saving standby state.
  • the information processing apparatus 200 switches from the activated state to the power saving standby state.
  • the process of step ST11 is executed.
  • step ST11 the power consumption calculation unit 23 sets the value of the power consumption P to a predetermined initial value (that is, 0).
  • step ST12 the power supply control device 100a waits for a predetermined time (for example, 10 seconds).
  • step ST13 the temperature information acquisition unit 21 acquires the temperature information.
  • the dark current estimation unit 22 estimates the dark current I based on the measured temperature Temp using the temperature information acquired in step ST13 (step ST14). More specifically, the dark current estimation unit 22 uses the acquired temperature information and the temperature dark current characteristic information stored in advance to generate the dark current I based on the measured temperature Temp and the temperature dark current characteristic C. presume.
  • the power consumption calculation unit 23 calculates the power consumption P based on the dark current I estimated in step ST14 (step ST15). More specifically, the power consumption calculation unit 23 updates the value of the power consumption P by the above formula (1).
  • the power consumption comparison unit 24a compares the power consumption P calculated in step ST15 with the first threshold value Th_1 (step ST16). As a result, the power consumption comparison unit 24a determines whether or not the power consumption P is equal to or greater than the first threshold value Th_1.
  • step ST16 “NO”) the process of the power supply control device 100a proceeds to step ST12.
  • step ST16 “YES” when it is determined that the power consumption P is equal to or higher than the first threshold value Th_1 (step ST16 “YES”), the power supply control device 100a then executes a control for setting the information processing device 200 to the shutdown state. As a result, the information processing apparatus 200 switches from the power saving standby state to the shutdown state. At this time, the power supply control unit 25a executes a control for setting the second power supply circuit 16_2 to the off state (step ST17). As a result, the second power supply circuit 16_2 is switched from the on state to the off state.
  • step ST18 the power supply control device 100a waits for a predetermined time (for example, 10 seconds).
  • step ST19 the temperature information acquisition unit 21 acquires the temperature information.
  • the dark current estimation unit 22 estimates the dark current I based on the measured temperature Temp using the temperature information acquired in step ST19 (step ST20). More specifically, the dark current estimation unit 22 uses the acquired temperature information and the temperature dark current characteristic information stored in advance to generate the dark current I based on the measured temperature Temp and the temperature dark current characteristic C. presume.
  • the power consumption calculation unit 23 calculates the power consumption P based on the dark current I estimated in step ST20 (step ST21). More specifically, the power consumption calculation unit 23 updates the value of the power consumption P by the above formula (1).
  • the power consumption comparison unit 24a compares the power consumption P calculated in step ST21 with the second threshold value Th_2 (step ST22). As a result, the power consumption comparison unit 24a determines whether or not the power consumption P is equal to or greater than the second threshold value Th_2.
  • step ST22 “NO”) the process of the power supply control device 100a proceeds to step ST18.
  • step ST22 “YES” when it is determined that the power consumption P is equal to or higher than the second threshold value Th_2 (step ST22 “YES”), the power supply control unit 25a then executes a control for setting the first power supply circuit 16_1 to the off state. (Step ST23). As a result, the first power supply circuit 16_1 switches from the on state to the off state.
  • the power supply control device 100a When the accessory power supply 2 is turned on during the execution of the process shown in FIG. 12A, that is, when the accessory power supply 2 is turned on before the execution of the process of step ST17, the power supply control device 100a performs the process shown in FIG. Suspend. Next, the power supply control device 100a executes control for setting the information processing device 200 to the activated state. As a result, the information processing device 200 switches from the power saving standby state to the activated state.
  • the power supply control unit 25a executes the control to set the second power supply circuit 16_2 to the ON state. As a result, the second power supply circuit 16_2 is switched from the off state to the on state.
  • the power supply control device 100a executes control for setting the information processing device 200 to the activated state. As a result, the information processing apparatus 200 switches from the shutdown state to the startup state.
  • the power supply control unit 25a turns on the first power supply circuit 16_1. Executes the control set to. As a result, the first power supply circuit 16_1 is switched from the off state to the on state.
  • the power supply control unit 25a executes a control for setting the second power supply circuit 16_2 to the ON state. As a result, the second power supply circuit 16_2 is switched from the off state to the on state.
  • the power supply control device 100a executes control for setting the information processing device 200 to the activated state. As a result, the information processing apparatus 200 switches from the shutdown state to the startup state.
  • the dark current estimation unit 22 is provided with temperature dark current characteristic information indicating the temperature dark current characteristic (hereinafter referred to as “first temperature dark current characteristic”) C_1 when the second power supply circuit 16_2 is set to the ON state. (Hereinafter referred to as “first temperature dark current characteristic information”), and the temperature dark current characteristic when the second power supply circuit 16_2 is set to the off state (hereinafter referred to as “second temperature dark current characteristic”). ”)
  • the temperature dark current characteristic information indicating C_2 (hereinafter referred to as“ second temperature dark current characteristic information ”) may be stored.
  • step ST14 the dark current estimation unit 22 estimates the dark current I based on the first temperature dark current characteristic C_1 using the first temperature dark current characteristic information. Further, in step ST20, the dark current estimation unit 22 estimates the dark current I based on the second temperature dark current characteristic C_2 by using the second temperature dark current characteristic information. As a result, the estimation accuracy of the dark current I in each of steps ST14 and ST20 can be further improved.
  • the power supply control device 100a can employ various modifications similar to those described in the first embodiment. Further, as the in-vehicle information device 300a, various modifications similar to those described in the first embodiment can be adopted.
  • the threshold value Th includes the first threshold value Th_1 and the second threshold value Th_2 which are different from each other, and the power supply circuit 16 is located at different parts of the in-vehicle information device 300.
  • the power supply control unit 25a includes the corresponding first power supply circuit 16_1 and the second power supply circuit 16_2, and when the power consumption P is equal to or higher than the first threshold value Th_1, the second power supply circuit 16_2 is set to the off state and consumed.
  • the first power supply circuit 16_1 is set to the off state.
  • the plurality of power supply circuits 16_1 and 16_2 can be sequentially set to the off state according to the increase in the power consumption P.
  • the second threshold value Th_2 is set to a value larger than the first threshold value Th_1, the portion corresponding to the first power supply circuit 16_1 includes the clock 11, and the portion corresponding to the second power supply circuit 16_2 is information.
  • the processing device 200 is included. Thereby, the stop timing of the power supply to the clock 11 can be delayed with respect to the stop timing of the power supply to the information processing apparatus 200.
  • FIG. 13 is a block diagram showing a main part of the in-vehicle information device according to the third embodiment.
  • the vehicle-mounted information device according to the third embodiment will be described with reference to FIG.
  • the same blocks as those shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.
  • the in-vehicle information device 300b has a processor 13b.
  • the processor 13b is composed of, for example, a microcomputer.
  • the processor 13b constitutes the main part of the power supply control device 100b.
  • the clock 11, the thermometer 12, the power supply circuit 16, the power supply control device 100b, and the information processing device 200 constitute a main part of the in-vehicle information device 300b.
  • FIG. 14 the same blocks as those shown in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted.
  • the deterioration degree determination unit 31 determines the deterioration degree D of the vehicle-mounted battery 5. Specifically, for example, the deterioration degree determination unit 31 determines the deterioration degree D by the following first determination method, second determination method, third determination method, or fourth determination method.
  • the deterioration degree determination unit 31 acquires information indicating the state of the vehicle-mounted battery 5 (hereinafter referred to as “battery state information”).
  • the battery status information is acquired from the ECU (Electronic Control Unit) in the vehicle 1 by using, for example, the in-vehicle network 3.
  • the deterioration degree determination unit 31 determines the deterioration degree D based on the state of the vehicle-mounted battery 5 by using the acquired battery state information.
  • the deterioration degree determination unit 31 acquires information (hereinafter referred to as “IG voltage information”) indicating a voltage waveform when the ignition power supply (hereinafter referred to as “IG power supply”) of the vehicle 1 is turned on.
  • IG voltage information is obtained from, for example, the IG power supply.
  • the deterioration degree determination unit 31 determines the deterioration degree D based on the amount of voltage decrease when the IG power supply is turned on, using the acquired IG voltage information.
  • the deterioration degree determination unit 31 acquires information indicating information indicating the mileage of the vehicle 1 (hereinafter referred to as “mileage information”).
  • the mileage information is acquired from the ECU in the vehicle 1 by using, for example, the in-vehicle network 3.
  • the deterioration degree determination unit 31 determines the deterioration degree D based on the mileage of the vehicle 1.
  • the deterioration degree determination unit 31 acquires information indicating the date and time when the vehicle-mounted battery 5 was replaced (hereinafter referred to as “battery replacement information”).
  • the battery replacement information is acquired from the ECU in the vehicle 1 by using, for example, the in-vehicle network 3.
  • the deterioration degree determination unit 31 counts the elapsed time after the replacement of the vehicle-mounted battery 5 by using the acquired battery replacement information. A clock 11 is used to count the elapsed time. The deterioration degree determination unit 31 determines the deterioration degree D based on the elapsed time.
  • the threshold value setting unit 32 sets the threshold value Th to a value corresponding to the deterioration degree D based on the determination result by the deterioration degree determination unit 31. As a result, when the degree of deterioration D is high, the threshold value Th is set to a smaller value than when the degree of deterioration D is low. That is, when the degree of deterioration D is low, the threshold value Th is set to a value larger than when the degree of deterioration D is high.
  • the higher the degree of deterioration D the smaller the threshold Th is set. That is, the lower the degree of deterioration D, the larger the threshold Th is set.
  • the battery capacity of the vehicle-mounted battery 5 decreases.
  • the threshold value Th the time from when the accessory power supply 2 is turned off until the power supply circuit 16 (more specifically, the second power supply circuit 16_2) is set to the off state is shortened. Can be done. As a result, it is possible to avoid the occurrence of battery exhaustion not only when the deterioration degree D is low but also when the deterioration degree D is high.
  • the main part of the power supply control device 100b is composed of the temperature information acquisition unit 21, the dark current estimation unit 22, the power consumption calculation unit 23, the power consumption comparison unit 24, the power supply control unit 25, the deterioration degree determination unit 31 and the threshold value setting unit 32. Is configured.
  • the deterioration degree determination unit 31 determines the deterioration degree D (step ST31). At this time, the deterioration degree determination unit 31 determines the deterioration degree D by the first determination method, the second determination method, the third determination method, or the fourth determination method. Next, the threshold value setting unit 32 sets the threshold value Th to a value corresponding to the degree of deterioration D based on the determination result in step ST31 (step ST32). As a result, the higher the degree of deterioration D, the smaller the threshold Th is set.
  • step ST6 the process of step ST6 is executed.
  • the threshold value Th set in step ST32 is used. If step ST6 is “NO”, the process of the power supply control device 100b proceeds to step ST2. On the other hand, if step ST6 "YES”, then the process of step ST7 is executed.
  • the power supply control device 100b may have a power consumption comparison unit 24a and a power supply control unit 25a instead of the power consumption comparison unit 24 and the power control unit 25.
  • the threshold value setting unit 32 sets each of the first threshold value Th_1 and the second threshold value Th_2 to a value corresponding to the degree of deterioration D.
  • the first threshold value Th_1 is set to a smaller value and the second threshold value Th_1 is set to a smaller value. That is, as the degree of deterioration D is lower, the first threshold value Th_1 is set to a larger value and the second threshold value Th_1 is set to a larger value.
  • FIG. 17 shows a flowchart in this case.
  • the same reference numerals are given to the same steps as those shown in FIG. As shown in FIG. 17, first, the processes of steps ST11 to ST15 are executed.
  • the deterioration degree determination unit 31 determines the deterioration degree D (step ST41). At this time, the deterioration degree determination unit 31 determines the deterioration degree D by the first determination method, the second determination method, the third determination method, or the fourth determination method. Next, the threshold value setting unit 32 sets the first threshold value Th_1 to a value corresponding to the degree of deterioration D based on the determination result in step ST41 (step ST42). As a result, the higher the degree of deterioration D, the smaller the first threshold value Th_1 is set.
  • step ST16 the first threshold value Th_1 set in step ST42 is used. If step ST16 “NO”, the process of the power supply control device 100b proceeds to step ST12. On the other hand, if step ST16 "YES”, then the process of step ST17 is executed.
  • the deterioration degree determination unit 31 determines the deterioration degree D (step ST51). At this time, the deterioration degree determination unit 31 determines the deterioration degree D by the first determination method, the second determination method, the third determination method, or the fourth determination method. Next, the threshold value setting unit 32 sets the second threshold value Th_2 to a value corresponding to the degree of deterioration D based on the determination result in step ST51 (step ST52). As a result, the higher the degree of deterioration D, the smaller the second threshold value Th_2 is set.
  • step ST22 the second threshold value Th_2 set in step ST52 is used. If step ST22 “NO”, the process of the power supply control device 100b proceeds to step ST18. On the other hand, if step ST22 "YES”, then the process of step ST23 is executed.
  • the method for determining the degree of deterioration D is not limited to the first determination method, the second determination method, the third determination method, and the fourth determination method.
  • Various known techniques can be used to determine the degree of deterioration D.
  • the power supply control device 100b can employ various modifications similar to those described in the first and second embodiments. Further, as the in-vehicle information device 300b, various modifications similar to those described in the first and second embodiments can be adopted.
  • the power supply control device 100b has the deterioration degree determination unit 31 for determining the deterioration degree D of the vehicle-mounted battery 5 and the threshold value setting for setting the threshold value Th to a value corresponding to the deterioration degree D.
  • a unit 32 is provided. As a result, the timing at which the power supply circuit 16 is set to the off state can be adjusted according to the degree of deterioration D.
  • the power supply control device and power supply control method of the present invention can be used for in-vehicle information devices.
  • the in-vehicle information device of the present invention can be used, for example, in a navigation system or an audio system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • Power Sources (AREA)

Abstract

A power supply control apparatus (100) is provided with: a temperature information acquisition unit (21) which acquires temperature information indicating a temperature (Temp) in a vehicle-mounted information device (300); a dark current estimation unit (22) which uses the temperature information to estimate a dark current (I) in the vehicle-mounted information device (300) on the basis of the temperature (Temp); and a power supply control unit (25) which performs control to set a power supply circuit (16) of the vehicle-mounted information device (300) to an off state depending on the result of the estimation performed by the dark current estimation unit (22).

Description

電源制御装置、車載用情報機器及び電源制御方法Power control device, in-vehicle information device and power control method
　本発明は、電源制御装置、車載用情報機器及び電源制御方法に関する。 The present invention relates to a power supply control device, an in-vehicle information device, and a power supply control method.
　従来、オペレーティングシステム（以下「ＯＳ」と記載する。）を有する車載用情報機器が開発されている。車載用情報機器のＯＳは、例えば、ＡＮＤＲＯＩＤ（登録商標）、Ｌｉｎｕｘ（登録商標）又はＷＩＮＤＯＷＳ（登録商標）を用いたものである。 Conventionally, in-vehicle information devices having an operating system (hereinafter referred to as "OS") have been developed. The OS of the in-vehicle information device uses, for example, ANDROID (registered trademark), Linux (registered trademark), or WINDOWS (registered trademark).
　アクセサリ電源（以下「ＡＣＣ電源」と記載することがある。）がオンされている状態においては、ＯＳによる種々の機能が実行される。このとき、車載用情報機器により電流が消費されることにより、電力が消費される。当該消費される電力は、例えば、常時電源（以下「＋Ｂ電源」と記載することがある。）により供給される。 When the accessory power supply (hereinafter sometimes referred to as "ACC power supply") is turned on, various functions by the OS are executed. At this time, electric power is consumed by consuming current by the in-vehicle information device. The consumed power is supplied by, for example, a constant power source (hereinafter, may be referred to as "+ B power source").
　これに対して、ＡＣＣ電源がオフされている状態においても、車載用情報機器により電流が消費されることにより、電力が消費される。以下、ＡＣＣ電源がオフされている状態にて車載用情報機器により消費される電流を「暗電流」という。 On the other hand, even when the ACC power supply is off, power is consumed by consuming current from the in-vehicle information device. Hereinafter, the current consumed by the in-vehicle information device when the ACC power supply is turned off is referred to as "dark current".
　ここで、暗電流の具体例について説明する。第一に、暗電流は、車載用情報機器内の受動素子によるリーク電流を含むものである。受動素子は、例えば、電解コンデンサにより構成されている。以下、この暗電流を「第１暗電流」ということがある。 Here, a specific example of dark current will be described. First, the dark current includes a leak current due to a passive element in an in-vehicle information device. The passive element is composed of, for example, an electrolytic capacitor. Hereinafter, this dark current may be referred to as a "first dark current".
　第二に、暗電流は、車載用情報機器内の揮発性メモリに記憶されている情報を保持するための電流を含むものである。揮発性メモリは、例えば、ＤＲＡＭ（Ｄｙｎａｍｉｃ　Ｒａｎｄｏｍ　Ａｃｃｅｓｓ　Ｍｅｍｏｒｙ）又はＳＲＡＭ（Ｓｔａｔｉｃ　Ｒａｎｄｏｍ　Ａｃｃｅｓｓ　Ｍｅｍｏｒｙ）により構成されている。揮発性メモリは、ＯＳによる各機能に用いられる。以下、この暗電流を「第２暗電流」ということがある。 Second, the dark current includes the current for holding the information stored in the volatile memory in the in-vehicle information device. The volatile memory is composed of, for example, a DRAM (Dynamic Random Access Memory) or a SRAM (Static Random Access Memory). Volatile memory is used for each function by the OS. Hereinafter, this dark current may be referred to as a "second dark current".
　第三に、暗電流は、車載用情報機器内のＩＣ（Ｉｎｔｅｇｒａｔｅｄ　Ｃｉｒｃｕｉｔ）を低速にて動作させるための電流を含むものである。ＩＣは、例えば、マイクロコントローラ（以下「マイコン」という。）及びＳｏＣ（Ｓｙｓｔｅｍ－ｏｎ－ａ－Ｃｈｉｐ）を含むものである。ＯＳによる各機能は、例えば、ＳｏＣにより実現される。以下、この暗電流を「第３暗電流」ということがある。 Thirdly, the dark current includes a current for operating an IC (Integrated Circuit) in an in-vehicle information device at a low speed. The IC includes, for example, a microcontroller (hereinafter referred to as "microcomputer") and a SoC (System-on-a-Chip). Each function by the OS is realized by, for example, SoC. Hereinafter, this dark current may be referred to as a "third dark current".
特開２０１５－９５０８６号公報JP-A-2015-95086
　ＡＣＣ電源がオフされている状態においては、車載用情報機器の再起動を高速にする観点から、第２暗電流及び第３暗電流を維持することが求められる。他方、この状態においては、いわゆる「バッテリ上がり」の発生を回避する観点から、第２暗電流及び第３暗電流を停止することが求められる。 When the ACC power supply is off, it is required to maintain the second dark current and the third dark current from the viewpoint of speeding up the restart of the in-vehicle information device. On the other hand, in this state, it is required to stop the second dark current and the third dark current from the viewpoint of avoiding the occurrence of so-called "battery exhaustion".
　そこで、車載用情報機器の再起動の高速化とバッテリ上がりの発生の回避との両立を図る観点から、車載用情報機器における暗電流を検出するのが好適である。また、当該検出された暗電流に基づき、第２暗電流及び第３暗電流のオンオフを制御するのが好適である。より具体的には、当該検出された暗電流に基づき、第２暗電流及び第３暗電流の停止タイミングを制御するのが好適である。 Therefore, it is preferable to detect the dark current in the in-vehicle information device from the viewpoint of achieving both high-speed restart of the in-vehicle information device and avoidance of battery exhaustion. Further, it is preferable to control the on / off of the second dark current and the third dark current based on the detected dark current. More specifically, it is preferable to control the stop timing of the second dark current and the third dark current based on the detected dark current.
　特許文献１には、車載用情報機器における暗電流を検出する技術が開示されている。特許文献１記載の技術は、暗電流の検出に専用のセンサ（暗電流センサＳＮ２）を用いるものである。このセンサにより、車載用情報機器の製造コストが増加する問題があった。 Patent Document 1 discloses a technique for detecting a dark current in an in-vehicle information device. The technique described in Patent Document 1 uses a dedicated sensor (dark current sensor SN2) for detecting dark current. This sensor has a problem of increasing the manufacturing cost of an in-vehicle information device.
　本発明は、上記のような課題を解決するためになされたものであり、暗電流検出用の専用のセンサを不要とすることを目的とする。 The present invention has been made to solve the above problems, and an object of the present invention is to eliminate the need for a dedicated sensor for detecting dark current.
　本発明の電源制御装置は、車載用情報機器における温度を示す温度情報を取得する温度情報取得部と、温度情報を用いて、温度に基づき、車載用情報機器における暗電流を推定する暗電流推定部と、暗電流推定部による推定結果に応じて、車載用情報機器における電源回路をオフ状態に設定する制御を実行する電源制御部と、を備えるものである。 The power supply control device of the present invention uses a temperature information acquisition unit that acquires temperature information indicating a temperature in an in-vehicle information device and a dark current estimation that estimates a dark current in an in-vehicle information device based on the temperature using the temperature information. It is provided with a unit and a power supply control unit that executes control for setting the power supply circuit in the in-vehicle information device to the off state according to the estimation result by the dark current estimation unit.
　本発明によれば、上記のように構成したので、暗電流検出用の専用のセンサを不要とすることができる。 According to the present invention, since it is configured as described above, it is possible to eliminate the need for a dedicated sensor for detecting dark current.
実施の形態１に係る車載用情報機器の要部を示すブロック図である。It is a block diagram which shows the main part of the vehicle-mounted information device which concerns on Embodiment 1. FIG. 実施の形態１に係る電源制御装置の要部を示すブロック図である。It is a block diagram which shows the main part of the power supply control apparatus which concerns on Embodiment 1. FIG. 車載用情報機器における温度暗電流特性の例を示す特性図である。It is a characteristic diagram which shows the example of the temperature dark current characteristic in an in-vehicle information device. 車載用情報機器における温度の時間変化の例を示す説明図である。It is explanatory drawing which shows the example of the time change of temperature in an in-vehicle information device. 車載用情報機器における暗電流の時間変化の例を示す説明図である。It is explanatory drawing which shows the example of the time change of a dark current in an in-vehicle information device. 車載用情報機器における消費電力量の時間変化の例を示す説明図である。It is explanatory drawing which shows the example of the time change of the power consumption in an in-vehicle information device. 実施の形態１に係る電源制御装置の動作を示すフローチャートである。It is a flowchart which shows the operation of the power-source control apparatus which concerns on Embodiment 1. FIG. 実施の形態１に係る他の電源制御装置の要部を示すブロック図である。It is a block diagram which shows the main part of another power supply control device which concerns on Embodiment 1. FIG. 実施の形態１に係る他の電源制御装置の要部を示すブロック図である。It is a block diagram which shows the main part of another power supply control device which concerns on Embodiment 1. FIG. 実施の形態２に係る車載用情報機器の要部を示すブロック図である。It is a block diagram which shows the main part of the in-vehicle information device which concerns on Embodiment 2. 実施の形態２に係る電源制御装置の要部を示すブロック図である。It is a block diagram which shows the main part of the power supply control device which concerns on Embodiment 2. 実施の形態２に係る電源制御装置の動作を示すフローチャートである。It is a flowchart which shows the operation of the power-source control device which concerns on Embodiment 2. 実施の形態２に係る電源制御装置の動作を示すフローチャートである。It is a flowchart which shows the operation of the power-source control device which concerns on Embodiment 2. 実施の形態３に係る車載用情報機器の要部を示すブロック図である。It is a block diagram which shows the main part of the in-vehicle information device which concerns on Embodiment 3. 実施の形態３に係る電源制御装置の要部を示すブロック図である。It is a block diagram which shows the main part of the power supply control device which concerns on Embodiment 3. 実施の形態３に係る電源制御装置の動作を示すフローチャートである。It is a flowchart which shows the operation of the power-source control device which concerns on Embodiment 3. 実施の形態３に係る他の電源制御装置の要部を示すブロック図である。It is a block diagram which shows the main part of another power supply control device which concerns on Embodiment 3. 実施の形態３に係る他の電源制御装置の動作を示すフローチャートである。It is a flowchart which shows the operation of another power-source control device which concerns on Embodiment 3. 実施の形態３に係る他の電源制御装置の動作を示すフローチャートである。It is a flowchart which shows the operation of another power-source control device which concerns on Embodiment 3.
　以下、この発明をより詳細に説明するために、この発明を実施するための形態について、添付の図面に従って説明する。 Hereinafter, in order to explain the present invention in more detail, a mode for carrying out the present invention will be described with reference to the accompanying drawings.
実施の形態１．
　図１は、実施の形態１に係る車載用情報機器の要部を示すブロック図である。図１を参照して、実施の形態１に係る車載用情報機器について説明する。なお、図１におけるブロック間の実線の矢印は、信号又は情報に対応している。また、図１におけるブロック間の破線の矢印は、電力又は電流に対応している。 Embodiment 1.
FIG. 1 is a block diagram showing a main part of an in-vehicle information device according to the first embodiment. The vehicle-mounted information device according to the first embodiment will be described with reference to FIG. The solid arrows between the blocks in FIG. 1 correspond to signals or information. Also, the dashed arrows between the blocks in FIG. 1 correspond to electric power or current.
　車載用情報機器３００は、車両１に搭載されている。車両１は、アクセサリ電源２を有している。また、車両１は、車載用ネットワーク３を有している。車載用ネットワーク３は、例えば、ＣＡＮ（Ｃｏｎｔｒｏｌｌｅｒ　Ａｒｅａ　Ｎｅｔｗｏｒｋ）により構成されている。また、車両１は、常時電源４を有している。常時電源４は、車載用バッテリ５と電気的に接続されている。車載用バッテリ５は、車両１に搭載されている。 The in-vehicle information device 300 is mounted on the vehicle 1. The vehicle 1 has an accessory power supply 2. Further, the vehicle 1 has an in-vehicle network 3. The in-vehicle network 3 is configured by, for example, CAN (Control Area Network). Further, the vehicle 1 has a constant power supply 4. The constant power supply 4 is electrically connected to the vehicle-mounted battery 5. The vehicle-mounted battery 5 is mounted on the vehicle 1.
　車載用情報機器３００は、時計１１を有している。また、車載用情報機器３００は、温度計１２を有している。温度計１２は、車載用情報機器３００における温度Ｔｅｍｐを測定するものである。温度計１２は、例えば、サーミスタにより構成されている。 The in-vehicle information device 300 has a clock 11. Further, the in-vehicle information device 300 has a thermometer 12. The thermometer 12 measures the temperature Temp in the in-vehicle information device 300. The thermometer 12 is composed of, for example, a thermistor.
　温度計１２により測定された温度（以下「測定温度」ということがある。）Ｔｅｍｐは、車載用情報機器３００における温度依存性を有する部位又は機能の制御に用いられる。具体的には、例えば、測定温度Ｔｅｍｐは、時計１１における時刻を補正する制御に用いられる。また、例えば、車載用情報機器３００が光ピックアップ（不図示）を有するものである場合、測定温度Ｔｅｍｐは、光ピックアップにおけるレーザダイオードの制御に用いられる。また、例えば、車載用情報機器３００が液晶ディスプレイ（不図示）を有するものである場合、測定温度Ｔｅｍｐは、液晶ディスプレイの制御に用いられる。 The temperature measured by the thermometer 12 (hereinafter sometimes referred to as "measured temperature") Temp is used for controlling a part or function having a temperature dependence in the in-vehicle information device 300. Specifically, for example, the measurement temperature Temp is used for controlling the time in the clock 11. Further, for example, when the in-vehicle information device 300 has an optical pickup (not shown), the measurement temperature Temp is used for controlling the laser diode in the optical pickup. Further, for example, when the in-vehicle information device 300 has a liquid crystal display (not shown), the measurement temperature Temp is used for controlling the liquid crystal display.
　車載用情報機器３００は、電源制御用のプロセッサ１３を有している。プロセッサ１３は、例えば、マイコンにより構成されている。プロセッサ１３により、電源制御装置１００の要部が構成されている。電源制御装置１００については、図２を参照して後述する。 The in-vehicle information device 300 has a processor 13 for power supply control. The processor 13 is composed of, for example, a microcomputer. The processor 13 constitutes a main part of the power supply control device 100. The power supply control device 100 will be described later with reference to FIG.
　車載用情報機器３００は、処理回路１４を有している。また、車載用情報機器３００は、揮発性のメモリ１５を有している。処理回路１４は、例えば、ＳｏＣにより構成されている。メモリ１５は、例えば、ＤＲＡＭ又はＳＲＡＭにより構成されている。処理回路１４及びメモリ１５により、情報処理装置２００の要部が構成されている。 The in-vehicle information device 300 has a processing circuit 14. Further, the in-vehicle information device 300 has a volatile memory 15. The processing circuit 14 is composed of, for example, SoC. The memory 15 is composed of, for example, a DRAM or an SRAM. The processing circuit 14 and the memory 15 form a main part of the information processing apparatus 200.
　ここで、情報処理装置２００は、ＯＳを有するものである。ＯＳは、例えば、ＡＮＤＲＯＩＤ（登録商標）、Ｌｉｎｕｘ（登録商標）又はＷＩＮＤＯＷＳ（登録商標）を用いたものである。ＯＳによる各機能は、処理回路１４により実現されるものである。また、メモリ１５は、ＯＳによる各機能に用いられるものである。 Here, the information processing device 200 has an OS. As the OS, for example, ANDROID (registered trademark), Linux (registered trademark) or WINDOWS (registered trademark) is used. Each function by the OS is realized by the processing circuit 14. Further, the memory 15 is used for each function by the OS.
　また、情報処理装置２００は、起動している状態（以下「起動状態」という。）及び停止している状態（以下「シャットダウン状態」という。）に加えて、起動状態における消費電力よりも小さい消費電力により待機している状態（以下「省電力待機状態」という。）を有している。情報処理装置２００は、電源制御装置１００により、起動状態、シャットダウン状態又は省電力待機状態に選択的に設定される。電源制御装置１００については、図２を参照して後述する。 Further, the information processing device 200 consumes less power than the power consumption in the activated state in addition to the activated state (hereinafter referred to as "started state") and the stopped state (hereinafter referred to as "shutdown state"). It has a state of standby by electric power (hereinafter referred to as "power saving standby state"). The information processing device 200 is selectively set to a start state, a shutdown state, or a power saving standby state by the power control device 100. The power supply control device 100 will be described later with reference to FIG.
　起動状態は、例えば、ＡＣＰＩ（Ａｄｖａｎｃｅｄ　Ｃｏｎｆｉｇｕｒａｔｉｏｎ　ａｎｄ　Ｐｏｗｅｒ　Ｉｎｔｅｒｆａｃｅ）におけるＳ０のステートに対応するものである。シャットダウン状態は、例えば、ＡＣＰＩにおけるＳ５のステートに対応するものである。省電力待機状態は、例えば、ＡＣＰＩにおけるＳ１、Ｓ２、Ｓ３又はＳ４のステートに対応するものである。すなわち、省電力待機状態は、いわゆる「サスペンド状態」、「スタンバイ状態」又は「スリープ状態」に対応するものである。 The activation state corresponds to, for example, the state of S0 in ACPI (Advanced Configuration and Power Interface). The shutdown state corresponds to, for example, the state of S5 in ACPI. The power saving standby state corresponds to, for example, the state of S1, S2, S3 or S4 in ACPI. That is, the power saving standby state corresponds to the so-called "suspend state", "standby state", or "sleep state".
　車載用情報機器３００は、電源回路１６を有している。より具体的には、車載用情報機器３００は、２個の電源回路１６＿１，１６＿２を有している。 The in-vehicle information device 300 has a power supply circuit 16. More specifically, the in-vehicle information device 300 has two power supply circuits 16_1 and 16_2.
　２個の電源回路１６＿１，１６＿２のうちの１個の電源回路（以下「第１電源回路」という。）１６＿１は、時計１１及びプロセッサ１３に電力を供給するものである。この電力は、例えば、常時電源４により供給されるものである。第１電源回路１６＿１は、例えば、リニアレギュレータにより構成されている。 One power supply circuit (hereinafter referred to as "first power supply circuit") 16_1 of the two power supply circuits 16_1 and 16_2 supplies electric power to the clock 11 and the processor 13. This electric power is, for example, always supplied by the power source 4. The first power supply circuit 16_1 is composed of, for example, a linear regulator.
　２個の電源回路１６＿１，１６＿２のうちの他の１個の電源回路（以下「第２電源回路」という。）１６＿２は、処理回路１４及びメモリ１５に電力を供給するものである。この電力は、例えば、常時電源４により供給されるものである。第２電源回路１６＿２は、例えば、リニアレギュレータにより構成されている。 The other one of the two power supply circuits 16_1 and 16_2 (hereinafter referred to as "second power supply circuit") 16_2 supplies electric power to the processing circuit 14 and the memory 15. This electric power is, for example, always supplied by the power source 4. The second power supply circuit 16_2 is composed of, for example, a linear regulator.
　このように、第１電源回路１６＿１及び第２電源回路１６＿２は、車載用情報機器３００における互いに異なる部位に電力を供給するものである。第１電源回路１６＿１及び第２電源回路１６＿２の各々は、電源制御装置１００により、オン状態又はオフ状態に選択的に設定される。以下、図２を参照して、電源制御装置１００について説明する。 As described above, the first power supply circuit 16_1 and the second power supply circuit 16_2 supply electric power to different parts of the in-vehicle information device 300. Each of the first power supply circuit 16_1 and the second power supply circuit 16_2 is selectively set to an on state or an off state by the power supply control device 100. Hereinafter, the power supply control device 100 will be described with reference to FIG.
　電源制御装置１００は、アクセサリ電源２がオンされたとき、その旨を示す信号を取得する。また、電源制御装置１００は、アクセサリ電源２がオフされたとき、その旨を示す信号を取得する。これらの信号は、例えば、アクセサリ電源２又は車載用ネットワーク３から取得される。電源制御装置１００は、これらの信号を用いて、アクセサリ電源２がオンされている状態であるかオフされている状態であるかを判定する機能を有している。 When the accessory power supply 2 is turned on, the power supply control device 100 acquires a signal indicating that fact. Further, when the accessory power supply 2 is turned off, the power supply control device 100 acquires a signal to that effect. These signals are obtained from, for example, the accessory power supply 2 or the vehicle-mounted network 3. The power control device 100 has a function of determining whether the accessory power supply 2 is on or off by using these signals.
　また、電源制御装置１００は、アクセサリ電源２がオフされたとき、情報処理装置２００を省電力待機状態に設定する機能を有している。これにより、情報処理装置２００は、起動状態から省電力待機状態に切り替わる。 Further, the power supply control device 100 has a function of setting the information processing device 200 to the power saving standby state when the accessory power supply 2 is turned off. As a result, the information processing apparatus 200 switches from the activated state to the power saving standby state.
　また、電源制御装置１００は、アクセサリ電源２がオフされている状態にて、第２電源回路１６＿２がオフ状態に設定されるとき、情報処理装置２００をシャットダウン状態に設定する機能を有している。これにより、情報処理装置２００は、省電力待機状態からシャットダウン状態に切り替わる。 Further, the power supply control device 100 has a function of setting the information processing device 200 to the shutdown state when the second power supply circuit 16_2 is set to the off state while the accessory power supply 2 is off. .. As a result, the information processing apparatus 200 switches from the power saving standby state to the shutdown state.
　また、電源制御装置１００は、アクセサリ電源２がオンされたとき、情報処理装置２００を起動状態に設定する機能を有している。これにより、情報処理装置２００は、省電力待機状態又はシャットダウン状態から起動状態に切り替わる。 Further, the power supply control device 100 has a function of setting the information processing device 200 to the activated state when the accessory power supply 2 is turned on. As a result, the information processing apparatus 200 switches from the power saving standby state or the shutdown state to the startup state.
　通常、省電力待機状態から起動状態への切替えに要する時間は、シャットダウン状態から起動状態への切替えに要する時間よりも短いものである。以下、これらの時間を総称して「再起動時間」ということがある。すなわち、省電力待機状態からの再起動時間は、シャットダウン状態からの再起動時間よりも短いものである。 Normally, the time required to switch from the power saving standby state to the start state is shorter than the time required to switch from the shutdown state to the start state. Hereinafter, these times may be collectively referred to as "restart time". That is, the restart time from the power saving standby state is shorter than the restart time from the shutdown state.
　これらの機能に加えて、電源制御装置１００は、以下の機能を有している。 In addition to these functions, the power supply control device 100 has the following functions.
　温度情報取得部２１は、アクセサリ電源２がオフされている状態にて、測定温度Ｔｅｍｐを示す情報（以下「温度情報」という。）を取得するものである。温度情報は、温度計１２から取得される。温度情報は、所定時間（例えば１０秒）Ｔ毎に取得される。所定時間Ｔのカウントには、時計１１が用いられる。 The temperature information acquisition unit 21 acquires information indicating the measurement temperature Temp (hereinafter referred to as "temperature information") in a state where the accessory power supply 2 is turned off. The temperature information is acquired from the thermometer 12. The temperature information is acquired every T for a predetermined time (for example, 10 seconds). A clock 11 is used for counting the predetermined time T.
　暗電流推定部２２は、温度情報取得部２１により取得された温度情報を用いて、測定温度Ｔｅｍｐに基づき、車載用情報機器３００における暗電流Ｉを推定するものである。 The dark current estimation unit 22 estimates the dark current I in the in-vehicle information device 300 based on the measured temperature Temp using the temperature information acquired by the temperature information acquisition unit 21.
　すなわち、以下、車載用情報機器３００における温度Ｔｅｍｐに対する暗電流Ｉを示す特性Ｃを「温度暗電流特性」という。図３は、温度暗電流特性Ｃの例を示している。図３に示す如く、温度Ｔｅｍｐが高くなるにつれて次第に暗電流Ｉが大きくなるものである。そこで、暗電流推定部２２には、温度暗電流特性Ｃを示す情報（以下「温度暗電流特性情報」という。）が予め記憶されている。暗電流推定部２２は、上記取得された温度情報及び予め記憶されている温度暗電流特性情報を用いて、測定温度Ｔｅｍｐ及び温度暗電流特性Ｃに基づき、暗電流Ｉを推定する。 That is, hereinafter, the characteristic C indicating the dark current I with respect to the temperature Temp in the in-vehicle information device 300 is referred to as the "temperature dark current characteristic". FIG. 3 shows an example of the temperature dark current characteristic C. As shown in FIG. 3, the dark current I gradually increases as the temperature Temp increases. Therefore, the dark current estimation unit 22 stores information indicating the temperature dark current characteristic C (hereinafter, referred to as “temperature dark current characteristic information”) in advance. The dark current estimation unit 22 estimates the dark current I based on the measured temperature Temp and the temperature dark current characteristic C by using the acquired temperature information and the temperature dark current characteristic information stored in advance.
　消費電力量算出部２３は、暗電流推定部２２により推定された暗電流Ｉの時間積分をするものである。これにより、消費電力量算出部２３は、アクセサリ電源２がオフされている状態における消費電力の積算値（以下「消費電力量」という。）Ｐを算出するものである。すなわち、消費電力量Ｐは、暗電流Ｉによる消費電力の積算値を示すものである。 The power consumption calculation unit 23 integrates the dark current I estimated by the dark current estimation unit 22 over time. As a result, the power consumption calculation unit 23 calculates the integrated value (hereinafter referred to as “power consumption”) P of the power consumption when the accessory power supply 2 is turned off. That is, the power consumption P indicates the integrated value of the power consumption due to the dark current I.
　具体的には、例えば、消費電力量算出部２３は、アクセサリ電源２がオフされたとき、消費電力量Ｐの値を所定の初期値（すなわち０）に設定する。アクセサリ電源２がオフされている状態にて、消費電力量算出部２３は、所定時間Ｔ毎に、すなわち暗電流Ｉが推定される毎に、以下の式（１）により消費電力量Ｐの値を更新する。これにより、消費電力量Ｐが算出される。 Specifically, for example, the power consumption calculation unit 23 sets the value of the power consumption P to a predetermined initial value (that is, 0) when the accessory power supply 2 is turned off. With the accessory power supply 2 turned off, the power consumption calculation unit 23 uses the following equation (1) to calculate the power consumption P every predetermined time T, that is, every time the dark current I is estimated. To update. As a result, the power consumption P is calculated.
　Ｐ＝Ｐ＋Ｉ×Ｔ　　（１） P = P + I × T (1)
　図４は、アクセサリ電源２がオフされている状態における温度Ｔｅｍｐの時間変化の例を示している。図５は、アクセサリ電源２がオフされている状態における暗電流Ｉの時間変化の例を示している。図６は、アクセサリ電源２がオフされている状態における消費電力量Ｐの時間変化の例を示している。図４、図５及び図６の各々における横軸は、アクセサリ電源２がオフされた時刻（図中０）に対する経過時間を示している。 FIG. 4 shows an example of the time change of the temperature Temp when the accessory power supply 2 is turned off. FIG. 5 shows an example of the time change of the dark current I in the state where the accessory power supply 2 is turned off. FIG. 6 shows an example of the time change of the power consumption P in the state where the accessory power supply 2 is turned off. The horizontal axis in each of FIGS. 4, 5 and 6 indicates the elapsed time with respect to the time when the accessory power supply 2 is turned off (0 in the figure).
　図４に示す温度Ｔｅｍｐと図５に示す暗電流Ｉとの対応関係は、図３に示す温度暗電流特性Ｃに基づくものである。また、図６に示す消費電力量Ｐは、図５に示す暗電流Ｉの時間積分をしてなるものである。 The correspondence between the temperature Temp shown in FIG. 4 and the dark current I shown in FIG. 5 is based on the temperature dark current characteristic C shown in FIG. Further, the power consumption P shown in FIG. 6 is obtained by time-integrating the dark current I shown in FIG.
　消費電力量比較部２４は、消費電力量算出部２３により算出された消費電力量Ｐを所定の閾値Ｔｈと比較するものである。これにより、消費電力量比較部２４は、消費電力量Ｐが閾値Ｔｈ以上であるか否かを判定するものである。閾値Ｔｈは、例えば、車載用バッテリ５の電池容量の初期値に所定の係数を乗じてなる値に設定されている。この係数は、０よりも大きく、かつ、１よりも小さい値である。 The power consumption comparison unit 24 compares the power consumption P calculated by the power consumption calculation unit 23 with a predetermined threshold value Th. As a result, the power consumption comparison unit 24 determines whether or not the power consumption P is equal to or greater than the threshold value Th. The threshold value Th is set to, for example, a value obtained by multiplying the initial value of the battery capacity of the vehicle-mounted battery 5 by a predetermined coefficient. This coefficient is greater than 0 and less than 1.
　電源制御部２５は、消費電力量比較部２４により消費電力量Ｐが閾値Ｔｈ以上であると判定されたとき、第２電源回路１６＿２をオフ状態に設定する制御を実行するものである。これにより、第２電源回路１６＿２は、オン状態からオフ状態に切り替わる。このとき、情報処理装置２００は、上記のとおり、省電力待機状態からシャットダウン状態に切り替わる。 The power supply control unit 25 executes control for setting the second power supply circuit 16_2 to the off state when the power consumption amount comparison unit 24 determines that the power consumption amount P is equal to or higher than the threshold value Th. As a result, the second power supply circuit 16_2 is switched from the on state to the off state. At this time, the information processing apparatus 200 switches from the power saving standby state to the shutdown state as described above.
　また、電源制御部２５は、アクセサリ電源２がオンされたとき、第２電源回路１６＿２がオフ状態に設定されている場合、第２電源回路１６＿２をオン状態に設定する制御を実行するものである。これにより、第２電源回路１６＿２は、オフ状態からオン状態に切り替わる。このとき、情報処理装置２００は、上記のとおり、シャットダウン状態から起動状態に切り替わる。 Further, the power supply control unit 25 executes control for setting the second power supply circuit 16_2 to the on state when the accessory power supply 2 is turned on and the second power supply circuit 16_2 is set to the off state. .. As a result, the second power supply circuit 16_2 is switched from the off state to the on state. At this time, the information processing apparatus 200 switches from the shutdown state to the startup state as described above.
　また、電源制御部２５は、常時、第１電源回路１６＿１をオン状態に設定する制御を実行するものである。すなわち、電源制御部２５は、アクセサリ電源２がオンされている状態であるかオフされている状態であるかにかかわらず、第１電源回路１６＿１をオン状態に設定する制御を実行するものである。 Further, the power supply control unit 25 always executes control for setting the first power supply circuit 16_1 to the ON state. That is, the power supply control unit 25 executes control for setting the first power supply circuit 16_1 to the on state regardless of whether the accessory power supply 2 is on or off. ..
　通常、プロセッサ１３における回路規模は、処理回路１４及びメモリ１５における回路規模に比して小さい。したがって、プロセッサ１３における暗電流は、処理回路１４及びメモリ１５における暗電流に比して小さい。このため、アクセサリ電源２がオフされている状態にて、第１電源回路１６＿１がオン状態に設定されていることにより、バッテリ上がりが発生する可能性は低い。また、通常、時計１１による機能（例えば計時機能）の重要度は、ＯＳによる機能（例えば表示機能）の重要度に比して高い。そこで、電源制御部２５は、アクセサリ電源２がオンされているときはもちろんのこと、アクセサリ電源２がオフされているときも、第１電源回路１６＿１をオン状態に設定するのである。 Normally, the circuit scale of the processor 13 is smaller than the circuit scale of the processing circuit 14 and the memory 15. Therefore, the dark current in the processor 13 is smaller than the dark current in the processing circuit 14 and the memory 15. Therefore, it is unlikely that the battery will run out because the first power supply circuit 16_1 is set to the on state while the accessory power supply 2 is off. Further, usually, the importance of the function by the clock 11 (for example, the timekeeping function) is higher than the importance of the function by the OS (for example, the display function). Therefore, the power supply control unit 25 sets the first power supply circuit 16_1 to the on state not only when the accessory power supply 2 is turned on but also when the accessory power supply 2 is turned off.
　温度情報取得部２１、暗電流推定部２２、消費電力量算出部２３、消費電力量比較部２４及び電源制御部２５により、電源制御装置１００の要部が構成されている。 The main part of the power supply control device 100 is composed of the temperature information acquisition unit 21, the dark current estimation unit 22, the power consumption calculation unit 23, the power consumption comparison unit 24, and the power supply control unit 25.
　次に、図７のフローチャートを参照して、電源制御装置１００の動作について、アクセサリ電源２がオフされている状態における動作を中心に説明する。すなわち、温度情報取得部２１、暗電流推定部２２、消費電力量算出部２３、消費電力量比較部２４及び電源制御部２５の動作を中心に説明する。 Next, the operation of the power supply control device 100 will be described with reference to the flowchart of FIG. 7, focusing on the operation in the state where the accessory power supply 2 is turned off. That is, the operations of the temperature information acquisition unit 21, the dark current estimation unit 22, the power consumption calculation unit 23, the power consumption comparison unit 24, and the power supply control unit 25 will be mainly described.
　アクセサリ電源２がオフされたとき、電源制御装置１００は、情報処理装置２００を省電力待機状態に設定する制御を実行する。これにより、情報処理装置２００は、起動状態から省電力待機状態に切り替わる。このとき、ステップＳＴ１の処理が実行される。 When the accessory power supply 2 is turned off, the power supply control device 100 executes control for setting the information processing device 200 to the power saving standby state. As a result, the information processing apparatus 200 switches from the activated state to the power saving standby state. At this time, the process of step ST1 is executed.
　まず、ステップＳＴ１にて、消費電力量算出部２３は、消費電力量Ｐの値を所定の初期値（すなわち０）に設定する。次いで、ステップＳＴ２にて、電源制御装置１００は、所定時間（例えば１０秒）Ｔ待機する。次いで、ステップＳＴ３にて、温度情報取得部２１は、温度情報を取得する。 First, in step ST1, the power consumption calculation unit 23 sets the value of the power consumption P to a predetermined initial value (that is, 0). Next, in step ST2, the power supply control device 100 waits for a predetermined time (for example, 10 seconds). Next, in step ST3, the temperature information acquisition unit 21 acquires the temperature information.
　次いで、暗電流推定部２２は、ステップＳＴ３にて取得された温度情報を用いて、測定温度Ｔｅｍｐに基づき、暗電流Ｉを推定する（ステップＳＴ４）。より具体的には、暗電流推定部２２は、当該取得された温度情報及び予め記憶されている温度暗電流特性情報を用いて、測定温度Ｔｅｍｐ及び温度暗電流特性Ｃに基づき、暗電流Ｉを推定する。 Next, the dark current estimation unit 22 estimates the dark current I based on the measured temperature Temp using the temperature information acquired in step ST3 (step ST4). More specifically, the dark current estimation unit 22 uses the acquired temperature information and the temperature dark current characteristic information stored in advance to generate the dark current I based on the measured temperature Temp and the temperature dark current characteristic C. presume.
　次いで、消費電力量算出部２３は、ステップＳＴ４にて推定された暗電流Ｉに基づき、消費電力量Ｐを算出する（ステップＳＴ５）。より具体的には、消費電力量算出部２３は、上記式（１）により、消費電力量Ｐの値を更新する。 Next, the power consumption calculation unit 23 calculates the power consumption P based on the dark current I estimated in step ST4 (step ST5). More specifically, the power consumption calculation unit 23 updates the value of the power consumption P by the above formula (1).
　次いで、消費電力量比較部２４は、ステップＳＴ５にて算出された消費電力量Ｐを閾値Ｔｈと比較する（ステップＳＴ６）。これにより、消費電力量比較部２４は、消費電力量Ｐが閾値Ｔｈ以上であるか否かを判定する。 Next, the power consumption comparison unit 24 compares the power consumption P calculated in step ST5 with the threshold value Th (step ST6). As a result, the power consumption comparison unit 24 determines whether or not the power consumption P is equal to or greater than the threshold value Th.
　消費電力量Ｐが閾値Ｔｈ未満であると判定された場合（ステップＳＴ６“ＮＯ”）、電源制御装置１００の処理は、ステップＳＴ２に進む。 When it is determined that the power consumption P is less than the threshold value Th (step ST6 “NO”), the process of the power supply control device 100 proceeds to step ST2.
　他方、消費電力量Ｐが閾値Ｔｈ以上であると判定された場合（ステップＳＴ６“ＹＥＳ”）、次いで、電源制御装置１００は、情報処理装置２００をシャットダウン状態に設定する制御を実行する。これにより、情報処理装置２００は、省電力待機状態からシャットダウン状態に切り替わる。このとき、電源制御部２５は、電源回路１６をオフ状態に設定する制御を実行する（ステップＳＴ７）。より具体的には、電源制御部２５は、第２電源回路１６＿２をオフ状態に設定する制御を実行する。これにより、第２電源回路１６＿２は、オン状態からオフ状態に切り替わる。 On the other hand, when it is determined that the power consumption P is equal to or higher than the threshold value Th (step ST6 “YES”), the power supply control device 100 then executes a control for setting the information processing device 200 to the shutdown state. As a result, the information processing apparatus 200 switches from the power saving standby state to the shutdown state. At this time, the power supply control unit 25 executes control for setting the power supply circuit 16 to the off state (step ST7). More specifically, the power supply control unit 25 executes control for setting the second power supply circuit 16_2 to the off state. As a result, the second power supply circuit 16_2 is switched from the on state to the off state.
　なお、図７に示す処理の実行中にアクセサリ電源２がオンされた場合、すなわちステップＳＴ７の処理の実行前にアクセサリ電源２がオンされた場合、電源制御装置１００は、図７に示す処理を中断する。次いで、電源制御装置１００は、情報処理装置２００を起動状態に設定する制御を実行する。これにより、情報処理装置２００は、省電力待機状態から起動状態に切り替わる。 When the accessory power supply 2 is turned on during the execution of the process shown in FIG. 7, that is, when the accessory power supply 2 is turned on before the execution of the process of step ST7, the power supply control device 100 performs the process shown in FIG. Suspend. Next, the power supply control device 100 executes control for setting the information processing device 200 to the activated state. As a result, the information processing device 200 switches from the power saving standby state to the activated state.
　また、図７に示す処理の実行後にアクセサリ電源２がオンされた場合、すなわちステップＳＴ７の処理の実行後にアクセサリ電源２がオンされた場合、電源制御部２５は、第２電源回路１６＿２をオン状態に設定する制御を実行する。これにより、第２電源回路１６＿２は、オフ状態からオン状態に切り替わる。次いで、電源制御装置１００は、情報処理装置２００を起動状態に設定する制御を実行する。これにより、情報処理装置２００は、シャットダウン状態から起動状態に切り替わる。 Further, when the accessory power supply 2 is turned on after the processing shown in FIG. 7, that is, when the accessory power supply 2 is turned on after the processing of step ST7 is executed, the power supply control unit 25 turns on the second power supply circuit 16_2. Executes the control set to. As a result, the second power supply circuit 16_2 is switched from the off state to the on state. Next, the power supply control device 100 executes control for setting the information processing device 200 to the activated state. As a result, the information processing apparatus 200 switches from the shutdown state to the startup state.
　このように、温度情報を用いて暗電流Ｉを推定することにより、暗電流検出用の専用のセンサを不要とすることができる。これにより、車載用情報機器３００における部品点数の増加を回避することができる。この結果、車載用情報機器３００の製造コストの低減を図ることができる。 By estimating the dark current I using the temperature information in this way, it is possible to eliminate the need for a dedicated sensor for detecting the dark current. As a result, it is possible to avoid an increase in the number of parts in the in-vehicle information device 300. As a result, the manufacturing cost of the in-vehicle information device 300 can be reduced.
　特に、温度暗電流特性情報を用いることにより、暗電流Ｉを推定するとき、高温時の暗電流Ｉの増加を考慮することができる。これにより、温度Ｔｅｍｐの高低にかかわらず、暗電流Ｉを正確に推定することができる。この結果、消費電力量Ｐを正確に算出することができる。 In particular, by using the temperature dark current characteristic information, when estimating the dark current I, it is possible to consider the increase in the dark current I at high temperature. As a result, the dark current I can be accurately estimated regardless of the temperature Temp. As a result, the power consumption P can be calculated accurately.
　また、消費電力量Ｐに応じて電源回路１６（より具体的には第２電源回路１６＿２）のオンオフを制御することにより、車載用情報機器３００の再起動の高速化とバッテリ上がりの発生の回避との両立を図ることができる。 Further, by controlling the on / off of the power supply circuit 16 (more specifically, the second power supply circuit 16_2) according to the power consumption P, the restart of the in-vehicle information device 300 can be speeded up and the occurrence of battery exhaustion can be avoided. It is possible to achieve both.
　なお、プロセッサ１３は、通常の動作モードに加えて、当該通常の動作モードにおける動作速度よりも低い動作速度による動作モード（以下「低速動作モード」という。）を有するものであっても良い。プロセッサ１３は、アクセサリ電源２がオフされているとき、低速動作モードにて動作するものであっても良い。これにより、電源制御装置１００における暗電流を低減することができる。 Note that the processor 13 may have an operation mode (hereinafter referred to as "low-speed operation mode") having an operation speed lower than the operation speed in the normal operation mode in addition to the normal operation mode. The processor 13 may operate in the low-speed operation mode when the accessory power supply 2 is turned off. As a result, the dark current in the power supply control device 100 can be reduced.
　また、電源制御部２５は、消費電力量比較部２４により消費電力量Ｐが閾値Ｔｈ以上であると判定されたとき、第２電源回路１６＿２をオフ状態に設定する制御を実行するのに加えて、第１電源回路１６＿１をオフ状態に設定する制御を実行するものであっても良い。これにより、第１電源回路１６＿１は、オン状態からオフ状態に切り替わる。その後、アクセサリ電源２がオンされたとき、電源制御部２５は、第１電源回路１６＿１をオン状態に設定する制御を実行する。これにより、第１電源回路１６＿１は、オフ状態からオン状態に切り替わる。すなわち、電源制御部２５により実行される制御は、暗電流推定部２２による推定結果に応じて、第１電源回路１６＿１又は第２電源回路１６＿２のうちの少なくとも一方をオフ状態に設定する制御であれば良い。 Further, the power supply control unit 25 executes control for setting the second power supply circuit 16_2 to the off state when the power consumption amount comparison unit 24 determines that the power consumption amount P is equal to or higher than the threshold value Th. , The control for setting the first power supply circuit 16_1 to the off state may be executed. As a result, the first power supply circuit 16_1 switches from the on state to the off state. After that, when the accessory power supply 2 is turned on, the power supply control unit 25 executes control for setting the first power supply circuit 16_1 to the on state. As a result, the first power supply circuit 16_1 is switched from the off state to the on state. That is, the control executed by the power supply control unit 25 may be a control in which at least one of the first power supply circuit 16_1 and the second power supply circuit 16_2 is set to the off state according to the estimation result by the dark current estimation unit 22. Just do it.
　また、温度情報取得部２１、暗電流推定部２２、消費電力量算出部２３及び電源制御部２５の機能がプロセッサ１３により実現されるとともに、消費電力量比較部２４の機能が他のプロセッサ（不図示）により実現されるものであっても良い。すなわち、図８に示す如く、温度情報取得部２１、暗電流推定部２２、消費電力量算出部２３及び電源制御部２５により、電源制御装置１００の要部が構成されているものであっても良い。 Further, the functions of the temperature information acquisition unit 21, the dark current estimation unit 22, the power consumption calculation unit 23, and the power supply control unit 25 are realized by the processor 13, and the functions of the power consumption comparison unit 24 are realized by another processor (non-function). It may be realized by (illustration). That is, as shown in FIG. 8, even if the main part of the power supply control device 100 is composed of the temperature information acquisition unit 21, the dark current estimation unit 22, the power consumption calculation unit 23, and the power supply control unit 25. good.
　また、温度情報取得部２１、暗電流推定部２２及び電源制御部２５の機能がプロセッサ１３により実現されるとともに、消費電力量算出部２３及び消費電力量比較部２４の機能が他のプロセッサ（不図示）により実現されるものであっても良い。すなわち、図９に示す如く、温度情報取得部２１、暗電流推定部２２及び電源制御部２５により、電源制御装置１００の要部が構成されているものであっても良い。 Further, the functions of the temperature information acquisition unit 21, the dark current estimation unit 22, and the power supply control unit 25 are realized by the processor 13, and the functions of the power consumption calculation unit 23 and the power consumption comparison unit 24 are other processors (non-function). It may be realized by (illustration). That is, as shown in FIG. 9, the main part of the power supply control device 100 may be configured by the temperature information acquisition unit 21, the dark current estimation unit 22, and the power supply control unit 25.
　以上のように、実施の形態１に係る電源制御装置１００は、車載用情報機器３００における温度Ｔｅｍｐを示す温度情報を取得する温度情報取得部２１と、温度情報を用いて、温度Ｔｅｍｐに基づき、車載用情報機器３００における暗電流Ｉを推定する暗電流推定部２２と、暗電流推定部２２による推定結果に応じて、車載用情報機器３００における電源回路１６をオフ状態に設定する制御を実行する電源制御部２５と、を備える。これにより、暗電流検出量の専用のセンサを不要とすることができる。この結果、車載用情報機器３００の製造コストの低減を図ることができる。 As described above, the power supply control device 100 according to the first embodiment is based on the temperature information acquisition unit 21 for acquiring the temperature information indicating the temperature Temp in the in-vehicle information device 300 and the temperature information based on the temperature Temp. The dark current estimation unit 22 that estimates the dark current I in the vehicle-mounted information device 300 and the control that sets the power supply circuit 16 in the vehicle-mounted information device 300 to the off state are executed according to the estimation result by the dark current estimation unit 22. It includes a power supply control unit 25. This makes it possible to eliminate the need for a dedicated sensor for the amount of dark current detected. As a result, the manufacturing cost of the in-vehicle information device 300 can be reduced.
　また、暗電流推定部２２は、温度情報及び車載用情報機器３００における温度暗電流特性Ｃを示す温度暗電流特性情報を用いて、温度Ｔｅｍｐ及び温度暗電流特性Ｃに基づき、暗電流Ｉを推定する。これにより、温度Ｔｅｍｐの高低にかかわらず、暗電流Ｉを正確に推定することができる。 Further, the dark current estimation unit 22 estimates the dark current I based on the temperature Temp and the temperature dark current characteristic C by using the temperature information and the temperature dark current characteristic information indicating the temperature dark current characteristic C in the in-vehicle information device 300. To do. As a result, the dark current I can be accurately estimated regardless of the temperature Temp.
　また、電源制御装置１００は、暗電流Ｉの時間積分により、車載用情報機器３００における消費電力量Ｐを算出する消費電力量算出部２３を備える。これにより、消費電力量Ｐに応じた電源回路１６の制御を実現することができる。 Further, the power supply control device 100 includes a power consumption calculation unit 23 that calculates the power consumption P of the in-vehicle information device 300 by time integration of the dark current I. Thereby, the control of the power supply circuit 16 according to the power consumption amount P can be realized.
　また、電源制御装置１００は、消費電力量Ｐを閾値Ｔｈと比較する消費電力量比較部２４を備え、電源制御部２５は、消費電力量Ｐが閾値Ｔｈ以上であるとき、電源回路１６をオフ状態に設定する。これにより、車載用情報機器３００の再起動の高速化とバッテリ上がりの発生の回避との両立を図ることができる。 Further, the power supply control device 100 includes a power consumption comparison unit 24 that compares the power consumption P with the threshold Th, and the power control unit 25 turns off the power circuit 16 when the power consumption P is equal to or higher than the threshold Th. Set to state. As a result, it is possible to achieve both high-speed restart of the in-vehicle information device 300 and avoidance of battery exhaustion.
　また、実施の形態１に係る車載用情報機器３００は、電源制御装置１００を備える車載用情報機器３００であって、電源制御装置１００は、車載用情報機器３００における温度Ｔｅｍｐを示す温度情報を取得する温度情報取得部２１と、温度情報を用いて、温度Ｔｅｍｐに基づき、車載用情報機器３００における暗電流Ｉを推定する暗電流推定部２２と、暗電流推定部２２による推定結果に応じて、車載用情報機器３００における電源回路１６をオフ状態に設定する制御を実行する電源制御部２５と、を有する。これにより、暗電流検出量の専用のセンサを不要とすることができる。この結果、車載用情報機器３００の製造コストの低減を図ることができる。 Further, the in-vehicle information device 300 according to the first embodiment is an in-vehicle information device 300 including a power supply control device 100, and the power supply control device 100 acquires temperature information indicating a temperature Temp in the in-vehicle information device 300. Based on the temperature information acquisition unit 21, the dark current estimation unit 22 that estimates the dark current I in the in-vehicle information device 300 based on the temperature Temp, and the dark current estimation unit 22 that estimates the dark current I. It has a power supply control unit 25 that executes control for setting the power supply circuit 16 in the in-vehicle information device 300 to an off state. This makes it possible to eliminate the need for a dedicated sensor for the amount of dark current detected. As a result, the manufacturing cost of the in-vehicle information device 300 can be reduced.
　また、実施の形態１に係る電源制御方法は、温度情報取得部２１が、車載用情報機器３００における温度Ｔｅｍｐを示す温度情報を取得するステップＳＴ３と、暗電流推定部２２が、温度情報を用いて、温度Ｔｅｍｐに基づき、車載用情報機器３００における暗電流Ｉを推定するステップＳＴ４と、電源制御部２５が、暗電流推定部２２による推定結果に応じて、車載用情報機器３００における電源回路１６をオフ状態に設定する制御を実行するステップＳＴ７と、を備える。これにより、暗電流検出用の専用のセンサを不要とすることができる。この結果、車載用情報機器３００の製造コストの低減を図ることができる。 Further, in the power supply control method according to the first embodiment, the temperature information acquisition unit 21 uses the temperature information in step ST3 for acquiring the temperature information indicating the temperature Temp in the in-vehicle information device 300, and the dark current estimation unit 22 uses the temperature information. In step ST4, which estimates the dark current I in the vehicle-mounted information device 300 based on the temperature Temp, the power supply control unit 25 determines the power supply circuit 16 in the vehicle-mounted information device 300 according to the estimation result by the dark current estimation unit 22. Step ST7, which executes control for setting the temperature to the off state, is provided. This makes it possible to eliminate the need for a dedicated sensor for dark current detection. As a result, the manufacturing cost of the in-vehicle information device 300 can be reduced.
実施の形態２．
　図１０は、実施の形態２に係る車載用情報機器の要部を示すブロック図である。図１０を参照して、実施の形態２に係る車載用情報機器について説明する。なお、図１０において、図１に示すブロックと同様のブロックには同一符号を付して説明を省略する。 Embodiment 2.
FIG. 10 is a block diagram showing a main part of the in-vehicle information device according to the second embodiment. The vehicle-mounted information device according to the second embodiment will be described with reference to FIG. In FIG. 10, the same blocks as those shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.
　車載用情報機器３００ａは、プロセッサ１３ａを有している。プロセッサ１３ａは、例えば、マイコンにより構成されている。プロセッサ１３ａにより、電源制御装置１００ａの要部が構成されている。時計１１、温度計１２、電源回路１６、電源制御装置１００ａ及び情報処理装置２００により、車載用情報機器３００ａの要部が構成されている。 The in-vehicle information device 300a has a processor 13a. The processor 13a is composed of, for example, a microcomputer. The processor 13a constitutes a main part of the power supply control device 100a. The clock 11, the thermometer 12, the power supply circuit 16, the power supply control device 100a, and the information processing device 200 constitute a main part of the in-vehicle information device 300a.
　次に、図１１を参照して、電源制御装置１００ａについて説明する。なお、図１１において、図２に示すブロックと同様のブロックには同一符号を付して説明を省略する。 Next, the power supply control device 100a will be described with reference to FIG. In FIG. 11, the same blocks as those shown in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted.
　消費電力量比較部２４ａは、消費電力量算出部２３により算出された消費電力量Ｐを所定の閾値（以下「第１閾値」ということがある。）Ｔｈ＿１と比較するものである。これにより、消費電力量比較部２４ａは、消費電力量Ｐが第１閾値Ｔｈ＿１以上であるか否かを判定するものである。 The power consumption comparison unit 24a compares the power consumption P calculated by the power consumption calculation unit 23 with a predetermined threshold value (hereinafter, may be referred to as “first threshold value”) Th_1. As a result, the power consumption comparison unit 24a determines whether or not the power consumption P is equal to or greater than the first threshold value Th_1.
　また、消費電力量比較部２４ａは、消費電力量算出部２３により算出された消費電力量Ｐを他の所定の閾値（以下「第２閾値」ということがある。）Ｔｈ＿２と比較するものである。これにより、消費電力量比較部２４ａは、消費電力量Ｐが第２閾値Ｔｈ＿２以上であるか否かを判定するものである。 Further, the power consumption comparison unit 24a compares the power consumption P calculated by the power consumption calculation unit 23 with another predetermined threshold value (hereinafter, may be referred to as “second threshold value”) Th_2. .. As a result, the power consumption comparison unit 24a determines whether or not the power consumption P is equal to or higher than the second threshold value Th_2.
　第１閾値Ｔｈ＿１は、例えば、図２に示す消費電力量比較部２４における閾値Ｔｈと同等の値に設定されている。これに対して、第２閾値Ｔｈ＿２は、第１閾値Ｔｈ＿１よりも大きい値に設定されている。このように、第１閾値Ｔｈ＿１及び第２閾値Ｔｈ＿２は、互いに異なる値に設定されている。 The first threshold value Th_1 is set to a value equivalent to the threshold value Th in the power consumption comparison unit 24 shown in FIG. 2, for example. On the other hand, the second threshold value Th_2 is set to a value larger than the first threshold value Th_1. As described above, the first threshold value Th_1 and the second threshold value Th_2 are set to different values.
　電源制御部２５ａは、消費電力量比較部２４ａにより消費電力量Ｐが第１閾値Ｔｈ＿１以上であると判定されたとき、第２電源回路１６＿２をオフ状態に設定する制御を実行するものである。また、電源制御部２５ａは、消費電力量比較部２４ａにより消費電力量Ｐが第２閾値Ｔｈ＿２以上であると判定されたとき、第１電源回路１６＿１をオフ状態に設定する制御を実行するものである。 The power supply control unit 25a executes a control for setting the second power supply circuit 16_2 to the off state when the power consumption amount comparison unit 24a determines that the power consumption amount P is equal to or higher than the first threshold value Th_1. Further, the power supply control unit 25a executes a control for setting the first power supply circuit 16_1 to the off state when the power consumption amount comparison unit 24a determines that the power consumption amount P is equal to or higher than the second threshold value Th_2. is there.
　すなわち、消費電力量比較部２４ａは、消費電力量Ｐを複数個の閾値Ｔｈ＿１，Ｔｈ＿２と比較するものである。電源制御部２５ａは、当該比較の結果に基づき、消費電力量Ｐの増加に応じて、複数個の電源回路１６＿１，１６＿２を順次オフ状態に設定するものである。 That is, the power consumption comparison unit 24a compares the power consumption P with a plurality of threshold values Th_1 and Th_2. Based on the result of the comparison, the power supply control unit 25a sequentially sets the plurality of power supply circuits 16_1 and 16_2 to the off state according to the increase in the power consumption amount P.
　実施の形態１にて説明したとおり、通常、時計１１による機能（例えば計時機能）の重要度は、ＯＳによる機能（例えば表示機能）の重要度に比して高い。そこで、第２電源回路１６＿２がオフ状態に設定されるタイミングに対して、第１電源回路１６＿１がオフ状態に設定されるタイミングを遅らせるものである。これにより、情報処理装置２００に対する電力供給の停止タイミングに対して、時計１１に対する電力供給の停止タイミングを遅らせることができる。 As described in the first embodiment, the importance of the function by the clock 11 (for example, the timekeeping function) is usually higher than the importance of the function by the OS (for example, the display function). Therefore, the timing at which the first power supply circuit 16_1 is set to the off state is delayed with respect to the timing at which the second power supply circuit 16_1 is set to the off state. Thereby, the stop timing of the power supply to the clock 11 can be delayed with respect to the stop timing of the power supply to the information processing apparatus 200.
　温度情報取得部２１、暗電流推定部２２、消費電力量算出部２３、消費電力量比較部２４ａ及び電源制御部２５ａにより、電源制御装置１００ａの要部が構成されている。 The main part of the power supply control device 100a is composed of the temperature information acquisition unit 21, the dark current estimation unit 22, the power consumption calculation unit 23, the power consumption comparison unit 24a, and the power supply control unit 25a.
　次に、図１２のフローチャートを参照して、電源制御装置１００ａの動作について、アクセサリ電源２がオフされている状態における動作を中心に説明する。すなわち、温度情報取得部２１、暗電流推定部２２、消費電力量算出部２３、消費電力量比較部２４ａ及び電源制御部２５ａの動作を中心に説明する。 Next, the operation of the power supply control device 100a will be described with reference to the flowchart of FIG. 12, focusing on the operation in the state where the accessory power supply 2 is turned off. That is, the operations of the temperature information acquisition unit 21, the dark current estimation unit 22, the power consumption calculation unit 23, the power consumption comparison unit 24a, and the power supply control unit 25a will be mainly described.
　アクセサリ電源２がオフされたとき、電源制御装置１００ａは、情報処理装置２００を省電力待機状態に設定する制御を実行する。これにより、情報処理装置２００は、起動状態から省電力待機状態に切り替わる。このとき、ステップＳＴ１１の処理が実行される。 When the accessory power supply 2 is turned off, the power supply control device 100a executes a control for setting the information processing device 200 to the power saving standby state. As a result, the information processing apparatus 200 switches from the activated state to the power saving standby state. At this time, the process of step ST11 is executed.
　まず、ステップＳＴ１１にて、消費電力量算出部２３は、消費電力量Ｐの値を所定の初期値（すなわち０）に設定する。次いで、ステップＳＴ１２にて、電源制御装置１００ａは、所定時間（例えば１０秒）Ｔ待機する。次いで、ステップＳＴ１３にて、温度情報取得部２１は、温度情報を取得する。 First, in step ST11, the power consumption calculation unit 23 sets the value of the power consumption P to a predetermined initial value (that is, 0). Next, in step ST12, the power supply control device 100a waits for a predetermined time (for example, 10 seconds). Next, in step ST13, the temperature information acquisition unit 21 acquires the temperature information.
　次いで、暗電流推定部２２は、ステップＳＴ１３にて取得された温度情報を用いて、測定温度Ｔｅｍｐに基づき、暗電流Ｉを推定する（ステップＳＴ１４）。より具体的には、暗電流推定部２２は、当該取得された温度情報及び予め記憶されている温度暗電流特性情報を用いて、測定温度Ｔｅｍｐ及び温度暗電流特性Ｃに基づき、暗電流Ｉを推定する。 Next, the dark current estimation unit 22 estimates the dark current I based on the measured temperature Temp using the temperature information acquired in step ST13 (step ST14). More specifically, the dark current estimation unit 22 uses the acquired temperature information and the temperature dark current characteristic information stored in advance to generate the dark current I based on the measured temperature Temp and the temperature dark current characteristic C. presume.
　次いで、消費電力量算出部２３は、ステップＳＴ１４にて推定された暗電流Ｉに基づき、消費電力量Ｐを算出する（ステップＳＴ１５）。より具体的には、消費電力量算出部２３は、上記式（１）により、消費電力量Ｐの値を更新する。 Next, the power consumption calculation unit 23 calculates the power consumption P based on the dark current I estimated in step ST14 (step ST15). More specifically, the power consumption calculation unit 23 updates the value of the power consumption P by the above formula (1).
　次いで、消費電力量比較部２４ａは、ステップＳＴ１５にて算出された消費電力量Ｐを第１閾値Ｔｈ＿１と比較する（ステップＳＴ１６）。これにより、消費電力量比較部２４ａは、消費電力量Ｐが第１閾値Ｔｈ＿１以上であるか否かを判定する。 Next, the power consumption comparison unit 24a compares the power consumption P calculated in step ST15 with the first threshold value Th_1 (step ST16). As a result, the power consumption comparison unit 24a determines whether or not the power consumption P is equal to or greater than the first threshold value Th_1.
　消費電力量Ｐが第１閾値Ｔｈ＿１未満であると判定された場合（ステップＳＴ１６“ＮＯ”）、電源制御装置１００ａの処理は、ステップＳＴ１２に進む。 When it is determined that the power consumption P is less than the first threshold value Th_1 (step ST16 “NO”), the process of the power supply control device 100a proceeds to step ST12.
　他方、消費電力量Ｐが第１閾値Ｔｈ＿１以上であると判定された場合（ステップＳＴ１６“ＹＥＳ”）、次いで、電源制御装置１００ａは、情報処理装置２００をシャットダウン状態に設定する制御を実行する。これにより、情報処理装置２００は、省電力待機状態からシャットダウン状態に切り替わる。このとき、電源制御部２５ａは、第２電源回路１６＿２をオフ状態に設定する制御を実行する（ステップＳＴ１７）。これにより、第２電源回路１６＿２は、オン状態からオフ状態に切り替わる。 On the other hand, when it is determined that the power consumption P is equal to or higher than the first threshold value Th_1 (step ST16 “YES”), the power supply control device 100a then executes a control for setting the information processing device 200 to the shutdown state. As a result, the information processing apparatus 200 switches from the power saving standby state to the shutdown state. At this time, the power supply control unit 25a executes a control for setting the second power supply circuit 16_2 to the off state (step ST17). As a result, the second power supply circuit 16_2 is switched from the on state to the off state.
　次いで、ステップＳＴ１８にて、電源制御装置１００ａは、所定時間（例えば１０秒）Ｔ待機する。次いで、ステップＳＴ１９にて、温度情報取得部２１は、温度情報を取得する。 Next, in step ST18, the power supply control device 100a waits for a predetermined time (for example, 10 seconds). Next, in step ST19, the temperature information acquisition unit 21 acquires the temperature information.
　次いで、暗電流推定部２２は、ステップＳＴ１９にて取得された温度情報を用いて、測定温度Ｔｅｍｐに基づき、暗電流Ｉを推定する（ステップＳＴ２０）。より具体的には、暗電流推定部２２は、当該取得された温度情報及び予め記憶されている温度暗電流特性情報を用いて、測定温度Ｔｅｍｐ及び温度暗電流特性Ｃに基づき、暗電流Ｉを推定する。 Next, the dark current estimation unit 22 estimates the dark current I based on the measured temperature Temp using the temperature information acquired in step ST19 (step ST20). More specifically, the dark current estimation unit 22 uses the acquired temperature information and the temperature dark current characteristic information stored in advance to generate the dark current I based on the measured temperature Temp and the temperature dark current characteristic C. presume.
　次いで、消費電力量算出部２３は、ステップＳＴ２０にて推定された暗電流Ｉに基づき、消費電力量Ｐを算出する（ステップＳＴ２１）。より具体的には、消費電力量算出部２３は、上記式（１）により、消費電力量Ｐの値を更新する。 Next, the power consumption calculation unit 23 calculates the power consumption P based on the dark current I estimated in step ST20 (step ST21). More specifically, the power consumption calculation unit 23 updates the value of the power consumption P by the above formula (1).
　次いで、消費電力量比較部２４ａは、ステップＳＴ２１にて算出された消費電力量Ｐを第２閾値Ｔｈ＿２と比較する（ステップＳＴ２２）。これにより、消費電力量比較部２４ａは、消費電力量Ｐが第２閾値Ｔｈ＿２以上であるか否かを判定する。 Next, the power consumption comparison unit 24a compares the power consumption P calculated in step ST21 with the second threshold value Th_2 (step ST22). As a result, the power consumption comparison unit 24a determines whether or not the power consumption P is equal to or greater than the second threshold value Th_2.
　消費電力量Ｐが第２閾値Ｔｈ＿２未満であると判定された場合（ステップＳＴ２２“ＮＯ”）、電源制御装置１００ａの処理は、ステップＳＴ１８に進む。 When it is determined that the power consumption P is less than the second threshold value Th_2 (step ST22 “NO”), the process of the power supply control device 100a proceeds to step ST18.
　他方、消費電力量Ｐが第２閾値Ｔｈ＿２以上であると判定された場合（ステップＳＴ２２“ＹＥＳ”）、次いで、電源制御部２５ａは、第１電源回路１６＿１をオフ状態に設定する制御を実行する（ステップＳＴ２３）。これにより、第１電源回路１６＿１は、オン状態からオフ状態に切り替わる。 On the other hand, when it is determined that the power consumption P is equal to or higher than the second threshold value Th_2 (step ST22 “YES”), the power supply control unit 25a then executes a control for setting the first power supply circuit 16_1 to the off state. (Step ST23). As a result, the first power supply circuit 16_1 switches from the on state to the off state.
　なお、図１２Ａに示す処理の実行中にアクセサリ電源２がオンされた場合、すなわちステップＳＴ１７の処理の実行前にアクセサリ電源２がオンされた場合、電源制御装置１００ａは、図１２に示す処理を中断する。次いで、電源制御装置１００ａは、情報処理装置２００を起動状態に設定する制御を実行する。これにより、情報処理装置２００は、省電力待機状態から起動状態に切り替わる。 When the accessory power supply 2 is turned on during the execution of the process shown in FIG. 12A, that is, when the accessory power supply 2 is turned on before the execution of the process of step ST17, the power supply control device 100a performs the process shown in FIG. Suspend. Next, the power supply control device 100a executes control for setting the information processing device 200 to the activated state. As a result, the information processing device 200 switches from the power saving standby state to the activated state.
　また、図１２Ｂに示す処理の実行中にアクセサリ電源２がオンされた場合、すなわちステップＳＴ１７の処理の実行後かつステップＳＴ２３の処理の実行前にアクセサリ電源２がオンされた場合、電源制御部２５ａは、第２電源回路１６＿２をオン状態に設定する制御を実行する。これにより、第２電源回路１６＿２は、オフ状態からオン状態に切り替わる。次いで、電源制御装置１００ａは、情報処理装置２００を起動状態に設定する制御を実行する。これにより、情報処理装置２００は、シャットダウン状態から起動状態に切り替わる。 Further, when the accessory power supply 2 is turned on during the execution of the process shown in FIG. 12B, that is, when the accessory power supply 2 is turned on after the execution of the process of step ST17 and before the execution of the process of step ST23, the power supply control unit 25a Executes the control to set the second power supply circuit 16_2 to the ON state. As a result, the second power supply circuit 16_2 is switched from the off state to the on state. Next, the power supply control device 100a executes control for setting the information processing device 200 to the activated state. As a result, the information processing apparatus 200 switches from the shutdown state to the startup state.
　また、図１２Ｂに示す処理の実行後にアクセサリ電源２がオンされた場合、すなわちステップＳＴ２３の処理の実行後にアクセサリ電源２がオンされた場合、電源制御部２５ａは、第１電源回路１６＿１をオン状態に設定する制御を実行する。これにより、第１電源回路１６＿１は、オフ状態からオン状態に切り替わる。次いで、電源制御部２５ａは、第２電源回路１６＿２をオン状態に設定する制御を実行する。これにより、第２電源回路１６＿２は、オフ状態からオン状態に切り替わる。次いで、電源制御装置１００ａは、情報処理装置２００を起動状態に設定する制御を実行する。これにより、情報処理装置２００は、シャットダウン状態から起動状態に切り替わる。 Further, when the accessory power supply 2 is turned on after the processing shown in FIG. 12B is executed, that is, when the accessory power supply 2 is turned on after the processing in step ST23 is executed, the power supply control unit 25a turns on the first power supply circuit 16_1. Executes the control set to. As a result, the first power supply circuit 16_1 is switched from the off state to the on state. Next, the power supply control unit 25a executes a control for setting the second power supply circuit 16_2 to the ON state. As a result, the second power supply circuit 16_2 is switched from the off state to the on state. Next, the power supply control device 100a executes control for setting the information processing device 200 to the activated state. As a result, the information processing apparatus 200 switches from the shutdown state to the startup state.
　なお、暗電流推定部２２には、第２電源回路１６＿２がオン状態に設定されているときの温度暗電流特性（以下「第１温度暗電流特性」という。）Ｃ＿１を示す温度暗電流特性情報（以下「第１温度暗電流特性情報」という。）が記憶されており、かつ、第２電源回路１６＿２がオフ状態に設定されているときの温度暗電流特性（以下「第２温度暗電流特性」という。）Ｃ＿２を示す温度暗電流特性情報（以下「第２温度暗電流特性情報」という。）が記憶されているものであっても良い。 The dark current estimation unit 22 is provided with temperature dark current characteristic information indicating the temperature dark current characteristic (hereinafter referred to as “first temperature dark current characteristic”) C_1 when the second power supply circuit 16_2 is set to the ON state. (Hereinafter referred to as "first temperature dark current characteristic information"), and the temperature dark current characteristic when the second power supply circuit 16_2 is set to the off state (hereinafter referred to as "second temperature dark current characteristic"). ”) The temperature dark current characteristic information indicating C_2 (hereinafter referred to as“ second temperature dark current characteristic information ”) may be stored.
　この場合、ステップＳＴ１４にて、暗電流推定部２２は、第１温度暗電流特性情報を用いて、第１温度暗電流特性Ｃ＿１に基づき、暗電流Ｉを推定する。また、ステップＳＴ２０にて、暗電流推定部２２は、第２温度暗電流特性情報を用いて、第２温度暗電流特性Ｃ＿２に基づき、暗電流Ｉを推定する。これにより、ステップＳＴ１４，ＳＴ２０の各々における暗電流Ｉの推定精度を更に向上することができる。 In this case, in step ST14, the dark current estimation unit 22 estimates the dark current I based on the first temperature dark current characteristic C_1 using the first temperature dark current characteristic information. Further, in step ST20, the dark current estimation unit 22 estimates the dark current I based on the second temperature dark current characteristic C_2 by using the second temperature dark current characteristic information. As a result, the estimation accuracy of the dark current I in each of steps ST14 and ST20 can be further improved.
　そのほか、電源制御装置１００ａは、実施の形態１にて説明したものと同様の種々の変形例を採用することができる。また、車載用情報機器３００ａは、実施の形態１にて説明したものと同様の種々の変形例を採用することができる。 In addition, the power supply control device 100a can employ various modifications similar to those described in the first embodiment. Further, as the in-vehicle information device 300a, various modifications similar to those described in the first embodiment can be adopted.
　以上のように、実施の形態２に係る電源制御装置１００ａにおいて、閾値Ｔｈは、互いに異なる第１閾値Ｔｈ＿１及び第２閾値Ｔｈ＿２を含み、電源回路１６は、車載用情報機器３００における互いに異なる部位に対応する第１電源回路１６＿１及び第２電源回路１６＿２を含み、電源制御部２５ａは、消費電力量Ｐが第１閾値Ｔｈ＿１以上であるとき、第２電源回路１６＿２をオフ状態に設定するとともに、消費電力量Ｐが第２閾値Ｔｈ＿２以上であるとき、第１電源回路１６＿１をオフ状態に設定する。これにより、消費電力量Ｐの増加に応じて、複数個の電源回路１６＿１，１６＿２を順次オフ状態に設定することができる。 As described above, in the power supply control device 100a according to the second embodiment, the threshold value Th includes the first threshold value Th_1 and the second threshold value Th_2 which are different from each other, and the power supply circuit 16 is located at different parts of the in-vehicle information device 300. The power supply control unit 25a includes the corresponding first power supply circuit 16_1 and the second power supply circuit 16_2, and when the power consumption P is equal to or higher than the first threshold value Th_1, the second power supply circuit 16_2 is set to the off state and consumed. When the electric energy P is equal to or greater than the second threshold value Th_2, the first power supply circuit 16_1 is set to the off state. As a result, the plurality of power supply circuits 16_1 and 16_2 can be sequentially set to the off state according to the increase in the power consumption P.
　また、第２閾値Ｔｈ＿２は、第１閾値Ｔｈ＿１よりも大きい値に設定されており、第１電源回路１６＿１に対応する部位は、時計１１を含み、第２電源回路１６＿２に対応する部位は、情報処理装置２００を含む。これにより、情報処理装置２００に対する電力供給の停止タイミングに対して、時計１１に対する電力供給の停止タイミングを遅らせることができる。 Further, the second threshold value Th_2 is set to a value larger than the first threshold value Th_1, the portion corresponding to the first power supply circuit 16_1 includes the clock 11, and the portion corresponding to the second power supply circuit 16_2 is information. The processing device 200 is included. Thereby, the stop timing of the power supply to the clock 11 can be delayed with respect to the stop timing of the power supply to the information processing apparatus 200.
実施の形態３．
　図１３は、実施の形態３に係る車載用情報機器の要部を示すブロック図である。図１３を参照して、実施の形態３に係る車載用情報機器について説明する。なお、図１３において、図１に示すブロックと同様のブロックには同一符号を付して説明を省略する。 Embodiment 3.
FIG. 13 is a block diagram showing a main part of the in-vehicle information device according to the third embodiment. The vehicle-mounted information device according to the third embodiment will be described with reference to FIG. In FIG. 13, the same blocks as those shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.
　車載用情報機器３００ｂは、プロセッサ１３ｂを有している。プロセッサ１３ｂは、例えば、マイコンにより構成されている。プロセッサ１３ｂにより、電源制御装置１００ｂの要部が構成されている。時計１１、温度計１２、電源回路１６、電源制御装置１００ｂ及び情報処理装置２００により、車載用情報機器３００ｂの要部が構成されている。 The in-vehicle information device 300b has a processor 13b. The processor 13b is composed of, for example, a microcomputer. The processor 13b constitutes the main part of the power supply control device 100b. The clock 11, the thermometer 12, the power supply circuit 16, the power supply control device 100b, and the information processing device 200 constitute a main part of the in-vehicle information device 300b.
　次に、図１４を参照して、電源制御装置１００ｂについて説明する。なお、図１４において、図２に示すブロックと同様のブロックには同一符号を付して説明を省略する。 Next, the power supply control device 100b will be described with reference to FIG. In FIG. 14, the same blocks as those shown in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted.
　劣化度判定部３１は、車載用バッテリ５の劣化度Ｄを判定するものである。具体的には、例えば、劣化度判定部３１は、以下の第１判定方法、第２判定方法、第３判定方法又は第４判定方法により劣化度Ｄを判定する。 The deterioration degree determination unit 31 determines the deterioration degree D of the vehicle-mounted battery 5. Specifically, for example, the deterioration degree determination unit 31 determines the deterioration degree D by the following first determination method, second determination method, third determination method, or fourth determination method.
〈第１判定方法〉
　劣化度判定部３１は、車載用バッテリ５の状態を示す情報（以下「バッテリ状態情報」という。）を取得する。バッテリ状態情報は、例えば、車載用ネットワーク３を用いて、車両１内のＥＣＵ（Ｅｌｅｃｔｒｏｎｉｃ　Ｃｏｎｔｒｏｌ　Ｕｎｉｔ）から取得される。劣化度判定部３１は、当該取得されたバッテリ状態情報を用いて、車載用バッテリ５の状態に基づき、劣化度Ｄを判定する。 <First judgment method>
The deterioration degree determination unit 31 acquires information indicating the state of the vehicle-mounted battery 5 (hereinafter referred to as “battery state information”). The battery status information is acquired from the ECU (Electronic Control Unit) in the vehicle 1 by using, for example, the in-vehicle network 3. The deterioration degree determination unit 31 determines the deterioration degree D based on the state of the vehicle-mounted battery 5 by using the acquired battery state information.
〈第２判定方法〉
　劣化度判定部３１は、車両１のイグニッション電源（以下「ＩＧ電源」と記載する。）がオンされたときの電圧波形を示す情報（以下「ＩＧ電圧情報」という。）を取得する。ＩＧ電圧情報は、例えば、ＩＧ電源から取得される。 <Second judgment method>
The deterioration degree determination unit 31 acquires information (hereinafter referred to as “IG voltage information”) indicating a voltage waveform when the ignition power supply (hereinafter referred to as “IG power supply”) of the vehicle 1 is turned on. The IG voltage information is obtained from, for example, the IG power supply.
　通常、車載用バッテリ５の劣化が進行するにつれて、すなわち劣化度Ｄが高くなるにつれて、ＩＧ電源がオンされたときの電圧低下量が次第に大きくなる。そこで、劣化度判定部３１は、上記取得されたＩＧ電圧情報を用いて、ＩＧ電源がオンされたときの電圧低下量に基づき、劣化度Ｄを判定する。 Normally, as the deterioration of the vehicle-mounted battery 5 progresses, that is, as the degree of deterioration D increases, the amount of voltage decrease when the IG power supply is turned on gradually increases. Therefore, the deterioration degree determination unit 31 determines the deterioration degree D based on the amount of voltage decrease when the IG power supply is turned on, using the acquired IG voltage information.
〈第３判定方法〉
　劣化度判定部３１は、車両１の走行距離を示す情報（以下「走行距離情報」という。）を示す情報を取得する。走行距離情報は、例えば、車載用ネットワーク３を用いて、車両１内のＥＣＵから取得される。 <Third judgment method>
The deterioration degree determination unit 31 acquires information indicating information indicating the mileage of the vehicle 1 (hereinafter referred to as “mileage information”). The mileage information is acquired from the ECU in the vehicle 1 by using, for example, the in-vehicle network 3.
　通常、車両１の走行距離が長くなるにつれて、車載用バッテリ５の劣化が進行する。すなわち、劣化度Ｄが高くなる。そこで、劣化度判定部３１は、車両１の走行距離に基づき、劣化度Ｄを判定する。 Normally, as the mileage of the vehicle 1 increases, the deterioration of the vehicle-mounted battery 5 progresses. That is, the degree of deterioration D becomes high. Therefore, the deterioration degree determination unit 31 determines the deterioration degree D based on the mileage of the vehicle 1.
〈第４判定方法〉
　劣化度判定部３１は、車載用バッテリ５が交換された日時を示す情報（以下「バッテリ交換情報」という。）を取得する。バッテリ交換情報は、例えば、車載用ネットワーク３を用いて、車両１内のＥＣＵから取得される。 <Fourth judgment method>
The deterioration degree determination unit 31 acquires information indicating the date and time when the vehicle-mounted battery 5 was replaced (hereinafter referred to as “battery replacement information”). The battery replacement information is acquired from the ECU in the vehicle 1 by using, for example, the in-vehicle network 3.
　通常、車載用バッテリ５の交換後の時間経過により、車載用バッテリ５の劣化が進行する。すなわち、劣化度Ｄが高くなる。そこで、劣化度判定部３１は、上記取得されたバッテリ交換情報を用いて、車載用バッテリ５の交換後の経過時間をカウントする。当該経過時間のカウントには、時計１１が用いられる。劣化度判定部３１は、当該経過時間に基づき、劣化度Ｄを判定する。 Normally, the deterioration of the vehicle-mounted battery 5 progresses with the passage of time after the replacement of the vehicle-mounted battery 5. That is, the degree of deterioration D becomes high. Therefore, the deterioration degree determination unit 31 counts the elapsed time after the replacement of the vehicle-mounted battery 5 by using the acquired battery replacement information. A clock 11 is used to count the elapsed time. The deterioration degree determination unit 31 determines the deterioration degree D based on the elapsed time.
　閾値設定部３２は、劣化度判定部３１による判定結果に基づき、閾値Ｔｈを劣化度Ｄに応じた値に設定するものである。これにより、劣化度Ｄが高いときは、劣化度Ｄが低いときに比して、閾値Ｔｈが小さい値に設定される。すなわち、劣化度Ｄが低いときは、劣化度Ｄが高いときに比して、閾値Ｔｈが大きい値に設定される。 The threshold value setting unit 32 sets the threshold value Th to a value corresponding to the deterioration degree D based on the determination result by the deterioration degree determination unit 31. As a result, when the degree of deterioration D is high, the threshold value Th is set to a smaller value than when the degree of deterioration D is low. That is, when the degree of deterioration D is low, the threshold value Th is set to a value larger than when the degree of deterioration D is high.
　換言すれば、劣化度Ｄが高いほど、閾値Ｔｈが小さい値に設定される。すなわち、劣化度Ｄが低いほど、閾値Ｔｈが大きい値に設定される。 In other words, the higher the degree of deterioration D, the smaller the threshold Th is set. That is, the lower the degree of deterioration D, the larger the threshold Th is set.
　通常、車載用バッテリ５の劣化が進行するにつれて、すなわち劣化度Ｄが高くなるにつれて、車載用バッテリ５の電池容量が減少する。これに対して、閾値Ｔｈを小さくすることにより、アクセサリ電源２がオフされてから電源回路１６（より具体的には第２電源回路１６＿２）がオフ状態に設定されるまでの時間を短くすることができる。これにより、劣化度Ｄが低いときはもちろんのこと、劣化度Ｄが高いときもバッテリ上がりの発生を回避することができる。 Normally, as the deterioration of the vehicle-mounted battery 5 progresses, that is, as the degree of deterioration D increases, the battery capacity of the vehicle-mounted battery 5 decreases. On the other hand, by reducing the threshold value Th, the time from when the accessory power supply 2 is turned off until the power supply circuit 16 (more specifically, the second power supply circuit 16_2) is set to the off state is shortened. Can be done. As a result, it is possible to avoid the occurrence of battery exhaustion not only when the deterioration degree D is low but also when the deterioration degree D is high.
　温度情報取得部２１、暗電流推定部２２、消費電力量算出部２３、消費電力量比較部２４、電源制御部２５、劣化度判定部３１及び閾値設定部３２により、電源制御装置１００ｂの要部が構成されている。 The main part of the power supply control device 100b is composed of the temperature information acquisition unit 21, the dark current estimation unit 22, the power consumption calculation unit 23, the power consumption comparison unit 24, the power supply control unit 25, the deterioration degree determination unit 31 and the threshold value setting unit 32. Is configured.
　次に、図１５のフローチャートを参照して、電源制御装置１００ｂの動作について、温度情報取得部２１、暗電流推定部２２、消費電力量算出部２３、消費電力量比較部２４、電源制御部２５、劣化度判定部３１及び閾値設定部３２の動作を中心に説明する。なお、図１５において、図７に示すステップと同様のステップには同一符号を付して説明を省略する。 Next, with reference to the flowchart of FIG. 15, regarding the operation of the power supply control device 100b, the temperature information acquisition unit 21, the dark current estimation unit 22, the power consumption calculation unit 23, the power consumption comparison unit 24, and the power supply control unit 25 The operation of the deterioration degree determination unit 31 and the threshold setting unit 32 will be mainly described. In FIG. 15, the same steps as those shown in FIG. 7 are designated by the same reference numerals and the description thereof will be omitted.
　まず、ステップＳＴ１～ＳＴ５の処理が実行される。 First, the processes of steps ST1 to ST5 are executed.
　次いで、劣化度判定部３１は、劣化度Ｄを判定する（ステップＳＴ３１）。このとき、劣化度判定部３１は、上記第１判定方法、上記第２判定方法、上記第３判定方法又は上記第４判定方法により劣化度Ｄを判定する。次いで、閾値設定部３２は、ステップＳＴ３１における判定結果に基づき、閾値Ｔｈを劣化度Ｄに応じた値に設定する（ステップＳＴ３２）。これにより、劣化度Ｄが高いほど、閾値Ｔｈが小さい値に設定される。 Next, the deterioration degree determination unit 31 determines the deterioration degree D (step ST31). At this time, the deterioration degree determination unit 31 determines the deterioration degree D by the first determination method, the second determination method, the third determination method, or the fourth determination method. Next, the threshold value setting unit 32 sets the threshold value Th to a value corresponding to the degree of deterioration D based on the determination result in step ST31 (step ST32). As a result, the higher the degree of deterioration D, the smaller the threshold Th is set.
　次いで、ステップＳＴ６の処理が実行される。ステップＳＴ６においては、ステップＳＴ３２にて設定された閾値Ｔｈが用いられる。ステップＳＴ６“ＮＯ”である場合、電源制御装置１００ｂの処理は、ステップＳＴ２に進む。他方、ステップＳＴ６“ＹＥＳ”である場合、次いで、ステップＳＴ７の処理が実行される。 Next, the process of step ST6 is executed. In step ST6, the threshold value Th set in step ST32 is used. If step ST6 is “NO”, the process of the power supply control device 100b proceeds to step ST2. On the other hand, if step ST6 "YES", then the process of step ST7 is executed.
　なお、図１６に示す如く、電源制御装置１００ｂは、消費電力量比較部２４及び電源制御部２５に代えて、消費電力量比較部２４ａ及び電源制御部２５ａを有するものであっても良い。この場合、閾値設定部３２は、第１閾値Ｔｈ＿１及び第２閾値Ｔｈ＿２の各々を劣化度Ｄに応じた値に設定する。これにより、劣化度Ｄが高いほど、第１閾値Ｔｈ＿１が小さい値に設定されるとともに、第２閾値Ｔｈ＿２が小さい値に設定される。すなわち、劣化度Ｄが低いほど、第１閾値Ｔｈ＿１が大きい値に設定されるとともに、第２閾値Ｔｈ＿２が大きい値に設定される。 As shown in FIG. 16, the power supply control device 100b may have a power consumption comparison unit 24a and a power supply control unit 25a instead of the power consumption comparison unit 24 and the power control unit 25. In this case, the threshold value setting unit 32 sets each of the first threshold value Th_1 and the second threshold value Th_2 to a value corresponding to the degree of deterioration D. As a result, as the degree of deterioration D is higher, the first threshold value Th_1 is set to a smaller value and the second threshold value Th_1 is set to a smaller value. That is, as the degree of deterioration D is lower, the first threshold value Th_1 is set to a larger value and the second threshold value Th_1 is set to a larger value.
　図１７は、この場合のフローチャートを示している。図１７において、図１２に示すステップと同様のステップには同一符号を付している。図１７に示す如く、まず、ステップＳＴ１１～ＳＴ１５の処理が実行される。 FIG. 17 shows a flowchart in this case. In FIG. 17, the same reference numerals are given to the same steps as those shown in FIG. As shown in FIG. 17, first, the processes of steps ST11 to ST15 are executed.
　次いで、劣化度判定部３１は、劣化度Ｄを判定する（ステップＳＴ４１）。このとき、劣化度判定部３１は、上記第１判定方法、上記第２判定方法、上記第３判定方法又は上記第４判定方法により劣化度Ｄを判定する。次いで、閾値設定部３２は、ステップＳＴ４１における判定結果に基づき、第１閾値Ｔｈ＿１を劣化度Ｄに応じた値に設定する（ステップＳＴ４２）。これにより、劣化度Ｄが高いほど、第１閾値Ｔｈ＿１が小さい値に設定される。 Next, the deterioration degree determination unit 31 determines the deterioration degree D (step ST41). At this time, the deterioration degree determination unit 31 determines the deterioration degree D by the first determination method, the second determination method, the third determination method, or the fourth determination method. Next, the threshold value setting unit 32 sets the first threshold value Th_1 to a value corresponding to the degree of deterioration D based on the determination result in step ST41 (step ST42). As a result, the higher the degree of deterioration D, the smaller the first threshold value Th_1 is set.
　次いで、ステップＳＴ１６の処理が実行される。ステップＳＴ１６においては、ステップＳＴ４２にて設定された第１閾値Ｔｈ＿１が用いられる。ステップＳＴ１６“ＮＯ”である場合、電源制御装置１００ｂの処理は、ステップＳＴ１２に進む。他方、ステップＳＴ１６“ＹＥＳ”である場合、次いで、ステップＳＴ１７の処理が実行される。 Next, the process of step ST16 is executed. In step ST16, the first threshold value Th_1 set in step ST42 is used. If step ST16 “NO”, the process of the power supply control device 100b proceeds to step ST12. On the other hand, if step ST16 "YES", then the process of step ST17 is executed.
　次いで、ステップＳＴ１８～ＳＴ２１の処理が実行される。 Next, the processes of steps ST18 to ST21 are executed.
　次いで、劣化度判定部３１は、劣化度Ｄを判定する（ステップＳＴ５１）。このとき、劣化度判定部３１は、上記第１判定方法、上記第２判定方法、上記第３判定方法又は上記第４判定方法により劣化度Ｄを判定する。次いで、閾値設定部３２は、ステップＳＴ５１における判定結果に基づき、第２閾値Ｔｈ＿２を劣化度Ｄに応じた値に設定する（ステップＳＴ５２）。これにより、劣化度Ｄが高いほど、第２閾値Ｔｈ＿２が小さい値に設定される。 Next, the deterioration degree determination unit 31 determines the deterioration degree D (step ST51). At this time, the deterioration degree determination unit 31 determines the deterioration degree D by the first determination method, the second determination method, the third determination method, or the fourth determination method. Next, the threshold value setting unit 32 sets the second threshold value Th_2 to a value corresponding to the degree of deterioration D based on the determination result in step ST51 (step ST52). As a result, the higher the degree of deterioration D, the smaller the second threshold value Th_2 is set.
　次いで、ステップＳＴ２２の処理が実行される。ステップＳＴ２２においては、ステップＳＴ５２にて設定された第２閾値Ｔｈ＿２が用いられる。ステップＳＴ２２“ＮＯ”である場合、電源制御装置１００ｂの処理は、ステップＳＴ１８に進む。他方、ステップＳＴ２２“ＹＥＳ”である場合、次いで、ステップＳＴ２３の処理が実行される。 Next, the process of step ST22 is executed. In step ST22, the second threshold value Th_2 set in step ST52 is used. If step ST22 “NO”, the process of the power supply control device 100b proceeds to step ST18. On the other hand, if step ST22 "YES", then the process of step ST23 is executed.
　なお、劣化度Ｄの判定方法は、上記第１判定方法、上記第２判定方法、上記第３判定方法及び上記第４判定方法に限定されるものではない。劣化度Ｄの判定には、公知の種々の技術を用いることができる。 The method for determining the degree of deterioration D is not limited to the first determination method, the second determination method, the third determination method, and the fourth determination method. Various known techniques can be used to determine the degree of deterioration D.
　そのほか、電源制御装置１００ｂは、実施の形態１，２にて説明したものと同様の種々の変形例を採用することができる。また、車載用情報機器３００ｂは、実施の形態１，２にて説明したものと同様の種々の変形例を採用することができる。 In addition, the power supply control device 100b can employ various modifications similar to those described in the first and second embodiments. Further, as the in-vehicle information device 300b, various modifications similar to those described in the first and second embodiments can be adopted.
　以上のように、実施の形態３に係る電源制御装置１００ｂは、車載用バッテリ５の劣化度Ｄを判定する劣化度判定部３１と、閾値Ｔｈを劣化度Ｄに応じた値に設定する閾値設定部３２と、を備える。これにより、劣化度Ｄに応じて、電源回路１６がオフ状態に設定されるタイミングを調節することができる。 As described above, the power supply control device 100b according to the third embodiment has the deterioration degree determination unit 31 for determining the deterioration degree D of the vehicle-mounted battery 5 and the threshold value setting for setting the threshold value Th to a value corresponding to the deterioration degree D. A unit 32 is provided. As a result, the timing at which the power supply circuit 16 is set to the off state can be adjusted according to the degree of deterioration D.
　また、劣化度Ｄが高いほど閾値Ｔｈが小さい値に設定されるものである。これにより、劣化度Ｄが低いときはもちろんのこと、劣化度Ｄが高いときもバッテリ上がりの発生を回避することができる。 Further, the higher the degree of deterioration D, the smaller the threshold Th is set. As a result, it is possible to avoid the occurrence of battery exhaustion not only when the deterioration degree D is low but also when the deterioration degree D is high.
　なお、本願発明はその発明の範囲内において、各実施の形態の自由な組み合わせ、あるいは各実施の形態の任意の構成要素の変形、もしくは各実施の形態において任意の構成要素の省略が可能である。 It should be noted that, within the scope of the invention, the present invention can be freely combined with each embodiment, modified from any component of each embodiment, or omitted from any component in each embodiment. ..
　本発明の電源制御装置及び電源制御方法は、車載用情報機器に用いることができる。本発明の車載用情報機器は、例えば、ナビゲーションシステム又はオーディオシステムに用いることができる。 The power supply control device and power supply control method of the present invention can be used for in-vehicle information devices. The in-vehicle information device of the present invention can be used, for example, in a navigation system or an audio system.
　１　車両、２　アクセサリ電源（ＡＣＣ電源）、３　車載用ネットワーク、４　常時電源（＋Ｂ電源）、５　車載用バッテリ、１１　時計、１２　温度計、１３，１３ａ，１３ｂ　プロセッサ、１４　処理回路、１５　メモリ、１６　電源回路、１６＿１　第１電源回路、１６＿２　第２電源回路、２１　温度情報取得部、２２　暗電流推定部、２３　消費電力量算出部、２４，２４ａ　消費電力量比較部、２５，２５ａ　電源制御部、３１　劣化度判定部、３２　閾値設定部、１００，１００ａ，１００ｂ　電源制御装置、２００　情報処理装置、３００，３００ａ，３００ｂ　車載用情報機器。 1 vehicle, 2 accessory power supply (ACC power supply), 3 in-vehicle network, 4 constant power supply (+ B power supply), 5 in-vehicle battery, 11 clock, 12 thermometer, 13, 13a, 13b processor, 14 processing circuit, 15 memory, 16 power supply circuit, 16_1 1st power supply circuit, 16_1 2nd power supply circuit, 21 temperature information acquisition unit, 22 dark current estimation unit, 23 power consumption calculation unit, 24, 24a power consumption comparison unit, 25, 25a power supply control unit , 31 Deterioration degree determination unit, 32 Threshold setting unit, 100, 100a, 100b power supply control device, 200 information processing device, 300, 300a, 300b in-vehicle information device.

Claims (10)

  1. 　車載用情報機器における温度を示す温度情報を取得する温度情報取得部と、
    　前記温度情報を用いて、前記温度に基づき、前記車載用情報機器における暗電流を推定する暗電流推定部と、
    　前記暗電流推定部による推定結果に応じて、前記車載用情報機器における電源回路をオフ状態に設定する制御を実行する電源制御部と、
    　を備える電源制御装置。     A temperature information acquisition unit that acquires temperature information indicating the temperature of in-vehicle information equipment,
    A dark current estimation unit that estimates the dark current in the in-vehicle information device based on the temperature using the temperature information, and a dark current estimation unit.
    A power supply control unit that executes control to set the power supply circuit in the in-vehicle information device to an off state according to the estimation result by the dark current estimation unit.
    Power control unit equipped with.
  2. 　前記暗電流推定部は、前記温度情報及び前記車載用情報機器における温度暗電流特性を示す温度暗電流特性情報を用いて、前記温度及び前記温度暗電流特性に基づき、前記暗電流を推定することを特徴とする請求項１記載の電源制御装置。 The dark current estimation unit estimates the dark current based on the temperature and the temperature dark current characteristics by using the temperature information and the temperature dark current characteristic information indicating the temperature dark current characteristics in the in-vehicle information device. The power supply control device according to claim 1.
  3. 　前記暗電流の時間積分により、前記車載用情報機器における消費電力量を算出する消費電力量算出部を備えることを特徴とする請求項１又は請求項２記載の電源制御装置。 The power supply control device according to claim 1 or 2, further comprising a power consumption calculation unit that calculates the power consumption of the in-vehicle information device by time integration of the dark current.
  4. 　前記消費電力量を閾値と比較する消費電力量比較部を備え、
    　前記電源制御部は、前記消費電力量が前記閾値以上であるとき、前記電源回路をオフ状態に設定する
    　ことを特徴とする請求項３記載の電源制御装置。     It is provided with a power consumption comparison unit that compares the power consumption with a threshold value.
    The power supply control device according to claim 3, wherein the power supply control unit sets the power supply circuit to an off state when the power consumption is equal to or higher than the threshold value.
  5. 　車載用バッテリの劣化度を判定する劣化度判定部と、
    　前記閾値を前記劣化度に応じた値に設定する閾値設定部と、
    　を備えることを特徴とする請求項４記載の電源制御装置。     Deterioration degree determination unit that determines the deterioration degree of the in-vehicle battery,
    A threshold value setting unit that sets the threshold value to a value corresponding to the degree of deterioration, and
    4. The power supply control device according to claim 4.
  6. 　前記劣化度が高いほど前記閾値が小さい値に設定されるものであることを特徴とする請求項５記載の電源制御装置。 The power supply control device according to claim 5, wherein the higher the degree of deterioration, the smaller the threshold value is set.
  7. 　前記閾値は、互いに異なる第１閾値及び第２閾値を含み、
    　前記電源回路は、前記車載用情報機器における互いに異なる部位に対応する第１電源回路及び第２電源回路を含み、
    　前記電源制御部は、前記消費電力量が前記第１閾値以上であるとき、前記第２電源回路をオフ状態に設定するとともに、前記消費電力量が前記第２閾値以上であるとき、前記第１電源回路をオフ状態に設定する
    　ことを特徴とする請求項４記載の電源制御装置。     The threshold includes a first threshold and a second threshold that are different from each other.
    The power supply circuit includes a first power supply circuit and a second power supply circuit corresponding to different parts of the in-vehicle information device.
    The power supply control unit sets the second power supply circuit to an off state when the power consumption is equal to or higher than the first threshold value, and when the power consumption is equal to or higher than the second threshold value, the first power supply control unit sets the second power supply circuit to an off state. The power supply control device according to claim 4, wherein the power supply circuit is set to an off state.
  8. 　前記第２閾値は、前記第１閾値よりも大きい値に設定されており、
    　前記第１電源回路に対応する部位は、時計を含み、
    　前記第２電源回路に対応する部位は、情報処理装置を含む
    　ことを特徴とする請求項７記載の電源制御装置。     The second threshold value is set to a value larger than the first threshold value.
    The part corresponding to the first power supply circuit includes a clock.
    The power supply control device according to claim 7, wherein the portion corresponding to the second power supply circuit includes an information processing device.
  9. 　電源制御装置を備える車載用情報機器であって、
    　前記電源制御装置は、
    　当該車載用情報機器における温度を示す温度情報を取得する温度情報取得部と、
    　前記温度情報を用いて、前記温度に基づき、当該車載用情報機器における暗電流を推定する暗電流推定部と、
    　前記暗電流推定部による推定結果に応じて、前記車載用情報機器における電源回路をオフ状態に設定する制御を実行する電源制御部と、を有する
    　ことを特徴とする車載用情報機器。     An in-vehicle information device equipped with a power control device.
    The power supply control device is
    A temperature information acquisition unit that acquires temperature information indicating the temperature of the in-vehicle information device, and
    A dark current estimation unit that estimates the dark current in the in-vehicle information device based on the temperature using the temperature information,
    An in-vehicle information device including a power supply control unit that executes control for setting a power supply circuit in the in-vehicle information device to an off state according to an estimation result by the dark current estimation unit.
  10. 　温度情報取得部が、車載用情報機器における温度を示す温度情報を取得するステップと、
    　暗電流推定部が、前記温度情報を用いて、前記温度に基づき、前記車載用情報機器における暗電流を推定するステップと、
    　電源制御部が、前記暗電流推定部による推定結果に応じて、前記車載用情報機器における電源回路をオフ状態に設定する制御を実行するステップと、
    　を備える電源制御方法。     The step in which the temperature information acquisition unit acquires temperature information indicating the temperature of the in-vehicle information device,
    A step in which the dark current estimation unit estimates the dark current in the in-vehicle information device based on the temperature using the temperature information.
    A step in which the power supply control unit executes control for setting the power supply circuit in the in-vehicle information device to an off state according to the estimation result by the dark current estimation unit.
    Power control method including.
PCT/JP2019/029766 2019-07-30 2019-07-30 Power supply control apparatus, vehicle-mounted information device, and power supply control method WO2021019666A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2019/029766 WO2021019666A1 (en) 2019-07-30 2019-07-30 Power supply control apparatus, vehicle-mounted information device, and power supply control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2019/029766 WO2021019666A1 (en) 2019-07-30 2019-07-30 Power supply control apparatus, vehicle-mounted information device, and power supply control method

Publications (1)

Publication Number Publication Date
WO2021019666A1 true WO2021019666A1 (en) 2021-02-04

Family

ID=74229303

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/029766 WO2021019666A1 (en) 2019-07-30 2019-07-30 Power supply control apparatus, vehicle-mounted information device, and power supply control method

Country Status (1)

Country Link
WO (1) WO2021019666A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004094732A (en) * 2002-09-02 2004-03-25 Matsushita Electric Ind Co Ltd Power supply control apparatus
JP2006142900A (en) * 2004-11-17 2006-06-08 Auto Network Gijutsu Kenkyusho:Kk Load controlling device
JP2009241633A (en) * 2008-03-28 2009-10-22 Shin Kobe Electric Mach Co Ltd Battery state detection system, and automobile having the same
JP2018111350A (en) * 2017-01-10 2018-07-19 三菱自動車工業株式会社 Power supply control device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004094732A (en) * 2002-09-02 2004-03-25 Matsushita Electric Ind Co Ltd Power supply control apparatus
JP2006142900A (en) * 2004-11-17 2006-06-08 Auto Network Gijutsu Kenkyusho:Kk Load controlling device
JP2009241633A (en) * 2008-03-28 2009-10-22 Shin Kobe Electric Mach Co Ltd Battery state detection system, and automobile having the same
JP2018111350A (en) * 2017-01-10 2018-07-19 三菱自動車工業株式会社 Power supply control device

Similar Documents

Publication Publication Date Title
CN108507699B (en) Method for estimating surface temperature of portable device and portable device
JP4404125B2 (en) Electronic control device and signal monitoring circuit
US9176563B2 (en) Leakage variation aware power management for multicore processors
US8185083B2 (en) Systems and methods for managing power consumption
KR20100000389A (en) Battery management method
CN109435761B (en) Storage battery voltage monitoring method and vehicle control unit
JP2002013438A (en) On-vehicle electronic controller
US8595530B2 (en) Information processing apparatus and control method of information processing apparatus
JP2023101509A (en) Semiconductor device and method for detecting remaining amount of battery
WO2021019666A1 (en) Power supply control apparatus, vehicle-mounted information device, and power supply control method
JP5254732B2 (en) Electronics
JP5367320B2 (en) Secondary battery state detection method, state detection device, and secondary battery power supply system
KR102336723B1 (en) Apparatus and method for managing battery
US9006924B2 (en) Electronic control device
JP2012218467A (en) Electronic control device
KR20210149760A (en) How to reset the battery&#39;s state of charge
JP2006002715A (en) Engine control circuit
JP2007253716A (en) Battery monitor
KR102663815B1 (en) A computing device and operation method thereof
KR100980943B1 (en) Generation Control Apparatus in Electric Vehicle and Method Thereof
US20230030558A1 (en) Electronic control unit, information processing method, and non-transitory storage medium
JP2005114555A (en) Control unit with time measurement function
JP5660010B2 (en) Information processing apparatus and data restoration method
JP2010067030A (en) Navigation apparatus
JP2012078360A (en) Method and device for detecting battery state, and battery power system

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19939542

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19939542

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP