JP2018114888A - Device, system, method and program for controlling power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device, a system, a method and a program for controlling a power supply, which suppress power consumption.SOLUTION: A power supply control device includes an acquisition part, an estimation part and a switching part. The acquisition part acquires vehicle information. The estimation part estimates a memory used amount of a volatile memory based on the vehicle information. The switching part switches between ON and OFF of power supplied to the volatile memory based on the memory used amount estimated by the estimation part.SELECTED DRAWING: Figure 1

Description

  The disclosed embodiments relate to a power supply control device, a power supply control system, a power supply control method, and a power supply control program.

  Conventionally, in a power supply control device that controls the power supply of a plurality of volatile memories, it is known to turn off the power supply of unused volatile memories (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-260893

  However, if the memory usage increases after the volatile memory power is turned off, the volatile memory cannot be used until the power is turned on. There is a problem that electric power cannot be suppressed.

  One aspect of the embodiments has been made in view of the above, and an object thereof is to provide a power supply control device, a power supply control system, a power supply control method, and a power supply control program capable of appropriately suppressing power consumption. To do.

  The power supply control device according to the embodiment includes an acquisition unit, an estimation unit, and a switching unit. The acquisition unit acquires vehicle information. The estimation unit estimates the memory usage for the volatile memory based on the vehicle information. The switching unit switches power ON / OFF for the volatile memory based on the memory usage estimated by the estimation unit.

  According to one aspect of the embodiment, power consumption can be appropriately suppressed.

FIG. 1 is a diagram for explaining the outline of power control according to the embodiment. FIG. 2 is a schematic block diagram of the power supply control system according to the embodiment. FIG. 3 is a diagram showing the relationship between the open / close state of the vehicle door, the electrical system state, and the memory power supply. FIG. 4 is a flowchart for explaining a power supply control process at the time of preliminary activation. FIG. 5 is a diagram illustrating the relationship between the running state of the vehicle, the memory usage, and the memory power source. FIG. 6 is a flowchart for explaining a power supply control process during operation of the navigation system. FIG. 7 is a diagram illustrating the relationship among the number of passengers, the amount of memory used, and the memory power source. FIG. 8 is a flowchart for explaining power control processing according to the number of passengers.

  Hereinafter, a power control device, a power control system, a power control method, and a power control program disclosed in the present application will be described with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below.

<Outline of power control>
An outline of power control according to the embodiment will be described with reference to FIG. FIG. 1 is a diagram for explaining the outline of power control according to the embodiment.

  The power control according to the embodiment is executed in a power control device that controls power supply to a plurality of volatile memories (hereinafter referred to as “memory”).

  The power supply control device acquires vehicle information (S1), and estimates the memory usage (hereinafter referred to as memory usage) necessary for exhibiting each function of the vehicle based on the vehicle information (S2). . The vehicle information is information relating to the opening and closing of the vehicle door, which will be described later in detail.

  The power supply control device switches the power sources of the plurality of memories (the first memory and the second memory in FIG. 1) based on the estimated memory usage (S3). That is, the number of memories that are turned on is adjusted.

  When the estimated memory usage is large, the power control device increases the number of memories that are turned on, and when the estimated memory usage is small, the power control device sets the number of memories that are turned on. Less than when the estimated memory usage is large.

  For example, when the estimated memory usage is large, the power control device turns on the power of the first memory and the second memory, and when the estimated memory usage is small, the power control device turns on the power of the first memory. Turn on and power off the second memory. In FIG. 1, a memory whose power is ON is indicated by hatching, and a memory whose power is OFF is indicated by white.

  In this way, the memory usage is estimated based on the vehicle information, and the memory power is turned on and off based on the estimated memory usage, so that the vehicle functions are prepared and consumed in the memory. Can be suppressed. That is, power consumption can be appropriately suppressed.

<Configuration of power supply control device 1>
Next, the power supply control device 1 according to the embodiment will be described with reference to FIG. FIG. 2 is a schematic block diagram of the power supply control device 1 according to the embodiment. In FIG. 2, the power supply line is indicated by a solid line, and the signal transmission line through which signals such as commands and information are transmitted is indicated by a broken line.

  The power supply control device 1 is mounted on the vehicle system 50 together with the sensor 10, the navigation system 20, the in-vehicle communication device 30, the terminal device 40, and the like.

  The power control device 1 includes a storage battery 2, a main power management unit 3, a main switch 4, a memory 5, a sub switch 6, and a CPU (Central Processing Unit) 7.

  The storage battery 2 is a lead battery, for example. The storage battery 2 supplies power to the CPU 7 and the memory 5. In addition, the storage battery 2 supplies power to an electrical system such as the navigation system 20 or the in-vehicle communication device 30.

  The main power management unit 3 receives vehicle power information, for example, a signal related to the voltage of the storage battery 2, a signal related to door lock release, and a signal related to ON / OFF of an accessory switch (not shown). The main power supply management unit 3 outputs a signal for changing the connection state of the main switch 4 based on the vehicle power supply information. When the door lock is released or the accessory switch is turned on, the main power management unit 3 outputs a signal for connecting the main switch 4.

  The main switch 4 includes a first main switch 4 a disposed on a power supply line that supplies power from the storage battery 2 to the CPU 7, and a first power switch that is disposed on a power supply line that supplies power from the storage battery 2 to the plurality of memories 5. 2 main switch 4b.

  The memory 5 is, for example, a RAM (Random Access Memory). A plurality of memories 5 are provided. Here, an example in which four memories 5 are provided will be described, but the present invention is not limited to this.

  The memory 5 stores data used when the CPU 7 executes a program stored in, for example, a ROM (Read Only Memory). The memory 5 stores various control data used for control processing. Each data is written to and read from the memory 5. The memory usage of the memory 5 is changed based on each processing content.

  When the connection state of the sub switch 6 arranged on each power supply line connecting each memory 5 and the storage battery 2 is switched to ON and OFF, the power source of each memory 5 is switched to ON and OFF, respectively. That is, the sub switch 6 is arranged corresponding to each memory 5, and the power state of each memory 5 is individually switched by switching the connection state of each sub switch 6.

  Hereinafter, each memory 5 is referred to as a first memory 5a to a fourth memory 5d, and each sub switch 6 corresponding to the first memory 5a to the fourth memory 5d is described as a first sub switch 6a to a fourth sub switch 6d. There are things to do. For example, the sub switch 6 corresponding to the first memory 5a is referred to as a first sub switch 6a, and the sub switch 6 corresponding to the second memory 5b is referred to as a second sub switch 6b.

  When the second main switch 4b is ON, the sub switch 6 is switched ON and OFF, whereby the power of the memory 5 is switched ON and OFF, respectively. For example, when the first sub switch 6a is turned on, the power of the first memory 5a is turned on, and when the second sub switch 6b is turned on, the power of the second memory 5b is turned on. When the first sub switch 6a is turned off, the power supply of the first memory 5a is turned off. When the second sub switch 6b is turned off, the power supply of the second memory 5b is turned off.

  The CPU 7 reads the program stored in the ROM and executes the program using the memory 5 as a work area. The CPU 7 activates an electrical system, for example, an operation system such as a navigation system 20, an in-vehicle communication device 30, a drive recorder, a back monitor, an object detection device, a rear monitor, an air conditioning, an audio device, and operates each electrical system.

  The CPU 7 includes an acquisition unit 7a, an estimation unit 7b, and a switching unit 7c.

  The acquisition unit 7a acquires vehicle information. The vehicle information is information related to opening / closing of a vehicle door (not shown), information related to the number of passengers, and processing load information in the navigation system 20.

  Information on opening and closing of the vehicle door is acquired based on a signal from a door opening and closing sensor included in the sensor 10. The door opening / closing sensors are provided on the driver's seat door, the passenger seat door, the rear seat door, and the back door (trunk door), respectively, and detect the opening / closing of each door. The sensor 10 may include switches such as an ignition switch.

  Information about the number of passengers is acquired based on, for example, a signal from a seat belt sensor included in the sensor 10 or a connection state between the in-vehicle communication device 30 and the terminal device 40 of the passenger. The seat belt sensors are respectively provided on seat belts (not shown) provided in the driver's seat, the passenger seat, and the rear seat.

  The in-vehicle communication device 30 is a device having a wireless communication function capable of communication at a relatively short distance in accordance with a standard such as an in-vehicle WiFi (registered trademark) router or Bluetooth (registered trademark). The terminal device 40 is a smartphone or a tablet.

  The number of passengers based on the connection state between the in-vehicle communication device 30 and the terminal device 40 is calculated according to the number of pairs (number of connections) between the in-vehicle communication device 30 and the terminal device 40.

  The navigation system 20 outputs vehicle position information as processing load information. The position information is information in which the traveling area where the vehicle is traveling is associated with the current position of the vehicle.

  The estimation unit 7b estimates the memory usage based on the vehicle information acquired by the acquisition unit 7a. The estimation unit 7b estimates that the memory usage is large, for example, when the driver's seat door is opened, when the number of passengers is large, or when the vehicle is traveling in an urban area where the navigation system 20 has a large processing load. To do.

  The switching unit 7c switches the power supply to each of the memories 5 based on the memory usage estimated by the estimation unit 7b, and adjusts the number of memories 5 to be turned on. The switching unit 7 c switches the power supply of each memory 5 to ON and OFF by switching the connection state of the sub switch 6 provided corresponding to each memory 5. When the estimated memory usage is large, the switching unit 7c increases the number of memories 5 to be turned on compared to when the estimated memory usage is small.

  The CPU 7 reads the program stored in the ROM, and executes the above-described functions by, for example, executing the program using the first memory 5a as a work area. Hereinafter, the above functions will be described collectively as being performed by the CPU 7.

<Power supply control during preliminary start-up>
Power supply control for turning on and off the power of the memory 5 at the time of preliminary activation will be described with reference to FIG. FIG. 3 is a diagram showing the relationship between the open / close state of the vehicle door, the electrical system state, and the memory power supply.

  Preliminary activation is a state in which the door lock is released and an ignition switch (not shown) that is a switch for starting the vehicle is not turned on. Here, the switch for starting the vehicle refers to a switch for making a vehicle engine as a drive source ready to start.

  When the door lock is released, the CPU 7 switches the power of the memory 5 to ON and OFF based on a signal from the door opening / closing sensor in the vehicle information, and adjusts the number of the memories 5 to be turned on.

  In the case 1 where the driver's seat door is opened, the CPU 7 estimates that the vehicle is likely to start and the memory usage is large.

  In the case 1, the CPU 7 sets the operation system of the electrical system to the full standby state in which the operation system is activated. For example, in the full standby state, the navigation system 20, the in-vehicle communication device 30, the drive recorder, the back monitor, the rear monitor, the object detection device, the air conditioning, the audio device, and the like are activated. In the electrical system, information when the previous power supply is turned off may be read.

  As described above, in the case 1, the CPU 7 estimates that the memory usage is large, and turns on the power of the first memory 5a to the fourth memory 5d. In case 1, there is no memory 5 that is turned off.

  In the case 2 in which the passenger seat door or the rear seat door is opened, the CPU 7 estimates that the possibility that the vehicle will subsequently start is lower than that in the case where the driver seat door is opened, and the memory usage is small. In the case 2, the CPU 7 activates the air conditioning and audio device that is not affected by the running of the vehicle in the electrical system. The electrical system to be activated is not limited to this, but is fewer than in case 1.

  As described above, in the case 2, the CPU 7 estimates that the memory usage is smaller than that in the case 1, turns on the power of the first memory 5a and the second memory 5b, and turns on the power of the third memory 5c and the fourth memory 5d. Set to OFF. The power supply of the memory 5 is not limited to this, and for example, the power supply of the first memory 5a to the third memory 5c may be turned on and the power supply of the fourth memory 5d may be turned off.

  In the case 3 in which the back door is opened, the CPU 7 estimates that the possibility that the vehicle will subsequently start is lower than that in the case where the passenger seat door or the rear seat door is opened, and the memory usage is smaller. In case 3, the room light is turned on. When the room light is turned on, the memory 5 is not used.

  Therefore, in the case 3, the CPU 7 estimates that the memory usage is smaller than the case 1 and the case 2, and turns on the power of the first memory 5a and turns off the power of the second memory 5b to the fourth memory 5d. .

  Thus, at the time of preliminary activation, the CPU 7 estimates the memory usage based on the type (position) of the opened vehicle door, and turns the power of the memory 5 on and off based on the estimated memory usage.

  Further, the CPU 7 turns off the power of the memory 5 that is turned on when the ignition switch is not turned on after the preliminary activation is started and a predetermined time elapses. The predetermined time is a preset time and is a time that can be determined not to start the vehicle.

  The predetermined time may be set based on the type of the opened vehicle door, that is, a signal from each door opening / closing sensor. For example, if the driver's seat door is opened, the vehicle is more likely to start, so even if the predetermined time is shorter than when the passenger door, rear seat door, or back door is opened. Good.

  Next, power control processing at the time of preliminary activation will be described with reference to FIG. FIG. 4 is a flowchart for explaining a power supply control process at the time of preliminary activation.

  When the door lock is released and preliminary activation is performed (S10; Yes), the CPU 7 turns on the power of the first memory 5a to the fourth memory 5d (S11). In addition, CPU7 complete | finishes this process, when not preliminarily starting (S11; No).

  CPU7 acquires the signal from each door opening / closing sensor as vehicle information (S12), and estimates memory usage based on the signal from each door opening / closing sensor (S13). The CPU 7 adjusts the power supply of the memory 5 based on the estimated memory usage (S14). That is, the CPU 7 switches the power supply of the memory 5 to ON and OFF based on the memory usage, and adjusts the number of the memories 5 to be turned ON.

  When the ignition switch is turned on and the preliminary activation is finished (S15; Yes), the CPU 7 finishes the current process.

  When the preliminary activation does not end (S15; No) and a predetermined time has elapsed since the start of the preliminary activation (S16; Yes), the CPU 7 turns off the power of the memory 5 that is turned on (S17). ). If the predetermined time has not elapsed since the start of the preliminary activation (S16; No), the CPU acquires vehicle information (S12) and repeats the above processing.

  Here, in order to cope with the start of the electric system when it is preliminarily activated, the power of the first memory 5a to the fourth memory 5d is once turned on. However, the present invention is not limited to this. Processing may be omitted.

<Power control during navigation system operation>
Next, power control during operation of the navigation system when the ignition switch is turned on and the engine is started will be described with reference to FIG. FIG. 5 is a diagram illustrating the relationship between the running state of the vehicle, the memory usage, and the memory power source.

  CPU7 acquires the positional information on a vehicle and switches the power supply of the memory 5 to ON and OFF based on positional information.

  In case 4 where the vehicle is traveling on an urban highway, the CPU 7 has a lot of information displayed on the navigation system 20 around the vehicle, such as a convenience store, and the frequency of updating the information is high. In many cases, since the processing load on the navigation system 20 is large, it is estimated that the memory usage is large.

  Therefore, in case 4, the CPU 7 turns on the power sources of the first memory 5a to the fourth memory 5d. In case 4, there is no memory 5 that is turned off.

  In the case 5 in which the vehicle is traveling on an urban area (general road) in the urban area, the CPU 7 updates the information less frequently than in the case 4, and the processing load in the navigation system 20 is smaller than in the case 4. Therefore, it is estimated that the memory usage is small.

  Therefore, in case 5, the CPU 7 turns on the power of the first memory 5a to the third memory 5c and turns off the power of the fourth memory 5d.

  In the case 6 where the vehicle is traveling on a local mountain road, the CPU 7 has less information to be displayed by the navigation system 20 around the case 5 than the case 5, and the processing load in the navigation system 20 is smaller than the case 5, Estimate that memory usage is small.

  Therefore, in case 6, the CPU 7 turns on the power of the first memory 5a and the second memory 5b, and turns off the power of the third memory 5c and the fourth memory 5d.

  In addition, the said case is an example and the memory 5 which turns a driving | running | working condition and a power supply ON is not limited to the said case. Further, the memory 5 that is turned on by classifying into more cases or less cases than the above case may be adjusted.

  As described above, when the navigation system 20 is operating, the CPU 7 estimates the memory usage to be used based on the processing load of the navigation system 20, and the power source of the memory 5 is based on the estimated memory usage. Turn ON and OFF.

  Next, power supply control processing during operation of the navigation system will be described with reference to FIG. FIG. 6 is a flowchart for explaining a power supply control process during operation of the navigation system. Here, it is assumed that the operation of the navigation system 20 is started.

  When the operation of the navigation system 20 is started, the CPU 7 turns on the power of the first memory 5a to the fourth memory 5d (S20).

  CPU7 acquires the positional information on a vehicle from the navigation system 20 (S21), and estimates memory usage according to the processing load of the navigation system 20 based on positional information (S22). The CPU 7 adjusts the power supply of the memory 5 based on the estimated memory usage (S23).

  CPU7 complete | finishes a process, when the operation | movement of the navigation system 20 is complete | finished (S24; Yes), ie, when the position display function in the navigation system 20 is stopped. If the operation of the navigation system 20 has not ended (S24; No), the CPU 7 acquires position information (S21) and repeats the above processing.

  When the operation of the navigation system 20 ends, the CPU 7 turns off the power of the memory 5 that is not used.

<Power control for passengers>
Next, power control corresponding to the number of passengers according to the number of passengers will be described with reference to FIG. FIG. 7 is a diagram illustrating the relationship among the number of passengers, the amount of memory used, and the memory power source.

  The CPU 7 acquires information related to the number of passengers based on the signal from the seat belt sensor and the connection state between the in-vehicle communication device 30 and the terminal device 40.

  In the case 7 where the number of passengers is one, the CPU 7 estimates that the memory usage is small when the in-vehicle communication device 30 and the terminal device 40 are connected and communication is performed via the in-vehicle communication device 30. Then, the power of the first memory 5a is turned on, and the power of the second memory 5b to the fourth memory 5d is turned off.

  In the case 8 where the number of passengers is two, the CPU 7 has a processing load when the in-vehicle communication device 30 and the terminal device 40 are connected and communication via the in-vehicle communication device 30 is performed by each passenger. It is estimated that the memory usage is larger than 7, and the memory usage is estimated to be larger than that in case 7.

  Therefore, in case 7, the CPU 7 turns on the power of the first memory 5a and the second memory 5b, and turns off the power of the third memory 5c and the fourth memory 5d.

  The CPU 7 estimates that the memory usage increases as the number of passengers increases in the case 9 where the number of passengers is three and the case 10 where the number of passengers is four.

  Therefore, in case 9, the CPU 7 turns on the power of the first memory 5a to the third memory 5c and turns off the power of the fourth memory 5d. In case 10, the CPU 7 turns on the power of the first memory 5a to the fourth memory 5d.

  Next, power control processing according to the number of passengers will be described with reference to FIG. FIG. 8 is a flowchart for explaining power control processing according to the number of passengers. Here, it is assumed that the operation of the in-vehicle communication device 30 is started, the communication function of the in-vehicle communication device 30 is started, and the in-vehicle communication device 30 and the terminal device 40 can be connected.

  When the operation of the in-vehicle communication device 30 is started, the CPU 7 turns on the power of the first memory 5a to the fourth memory 5d (S30).

  The CPU 7 acquires information related to the number of passengers (S31), and estimates the memory usage based on the number of passengers (S32). The CPU 7 adjusts the power supply of the memory 5 based on the estimated memory usage (S33).

  CPU7 complete | finishes a process, when the operation | movement of the vehicle-mounted communication apparatus 30 is complete | finished (S34; Yes), ie, when the communication function in the vehicle-mounted communication apparatus 30 is stopped. If the operation of the in-vehicle communication device 30 has not ended (S34; No), the CPU 7 obtains information on the number of passengers (S31) and repeats the above process.

  When the operation of the in-vehicle communication device 30 is finished, the CPU 7 turns off the power of the memory 5 that is not used.

  Further, the CPU 7 may update the information related to the number of passengers only when the number of passengers increases with respect to the number of passengers acquired again until the vehicle door is opened. That is, in the information regarding the number of passengers acquired again, when the number of passengers decreases, the CPU 7 does not need to update the information regarding the number of passengers.

  Next, the effect of this embodiment will be described.

  The memory usage is estimated based on the vehicle information, and the power of the memory 5 is switched on and off based on the estimated memory usage. Thereby, the power supply of the memory 5 can be appropriately turned off, and the power consumption in the memory 5 can be appropriately suppressed. Further, when the load of the control process increases, the power of the memory 5 is turned on based on the estimated memory usage, so that the control process can be performed quickly.

  Further, the power supply for each of the plurality of memories 5 is switched on and off based on the estimated memory usage. Thereby, the power supply of the some memory 5 can be turned off appropriately, and the power consumption in the memory 5 can further be suppressed.

  At the time of preliminary activation, the memory power is switched ON and OFF based on the estimated memory usage. Thereby, the power consumption in the memory at the time of preliminary activation can be suppressed, and for example, a decrease in the amount of power stored in the storage battery 2 can be suppressed.

  At the time of preliminary activation, the memory usage is estimated based on the vehicle information related to the opening and closing of the vehicle door, and the power supply of the memory 5 is switched on and off. Thereby, it can be estimated whether or not the vehicle starts, the power source of the memory 5 can be appropriately turned on and off, and the control process can be quickly performed while the power consumption in the memory 5 is suppressed.

  When the driver's seat door is opened, the memory usage is estimated to be larger than when other doors are opened, and the power of many memories 5 is turned on. Thereby, when the possibility that the vehicle will start is high, the number of the memories 5 to be turned on can be increased, and the control process at the time of starting can be quickly performed. Further, when the other door is opened, the power consumption in the memory 5 can be suppressed by reducing the memory 5 that is turned on.

  If the ignition switch is not turned on until a predetermined time has elapsed after the vehicle door is opened, the power of the memory 5 once turned on is turned off. When the possibility that the vehicle starts is low, the power consumption of the memory 5 can be suppressed by turning off the power of the memory 5.

  Based on the vehicle position information in the navigation system 20, the memory usage is estimated, and the power supply of the memory 5 is switched between ON and OFF. Thereby, when the processing load of the navigation system 20 is small, the power supply of the memory 5 can be appropriately turned off, and the power consumption in the memory 5 can be appropriately suppressed. Further, when the processing load of the navigation system 20 is large, the power of the memory 5 is turned on based on the estimated memory usage, so that the control process can be performed quickly.

  The memory usage is estimated based on the vehicle information regarding the number of passengers, and the power source of the memory 5 is switched on and off based on the estimated memory usage. Thereby, the power supply of the memory 5 can be appropriately turned off, and the power consumption in the memory 5 can be appropriately suppressed. Further, when the load of the control process increases, the power of the memory 5 is turned on based on the estimated memory usage, so that the control process can be performed quickly.

  The memory usage is estimated from the number of passengers based on the connection state between the in-vehicle communication device 30 and the terminal device 40, and the power source of the memory 5 is switched between ON and OFF based on the estimated memory usage. Thereby, the memory usage can be accurately estimated, the power supply of the memory 5 can be appropriately turned on and off, and the power consumption in the memory 5 can be suppressed. Further, when the load of the control process increases, the power of the memory 5 is turned on based on the estimated memory usage, so that the control process can be performed quickly.

  Next, a modification of the above embodiment will be described.

  At the time of preliminary activation, the CPU 7 may turn on and off the power of the memory 5 based on the amount of power stored in the storage battery 2. CPU7 decreases the memory 5 which turns ON a power supply, so that the electrical storage amount of the storage battery 2 is small. Note that the charged amount is detected by, for example, a voltage sensor or a current sensor.

  Further, when the storage amount of the storage battery 2 is smaller than the predetermined amount, the CPU 7 prioritizes the storage amount over the memory usage amount estimated based on the type of the opened vehicle door, and powers the memory 5. You may switch to ON and OFF. The predetermined amount is a value set in advance, and is a value that may cause the storage battery 2 to deteriorate due to a decrease in the amount of stored electricity. When the charged amount is smaller than a predetermined amount, the CPU 7 turns on only the power source of the first memory 5a, for example. Further, the CPU 7 may turn off the power of the first memory 5a to the fourth memory 5d when the charged amount is smaller than a predetermined amount. Thereby, the fall of the electrical storage amount can be suppressed and deterioration of the storage battery 2 can be suppressed.

  Further, at the time of preliminary activation, a predetermined time may be set according to the type of the opened vehicle door. For example, the predetermined time when the back door is opened may be longer than the predetermined time when the driver's seat door is opened. If the back door is opened, the driver may be taking in and out the luggage. Therefore, the time until the ignition switch is turned on becomes longer than when the driver's seat door is opened. Thereby, the time until the power of the memory 5 is turned off can be appropriately adjusted according to the type of the opened door.

  Further, for example, when the power of the plurality of memories 5 is turned on, such as when the driver's seat door is opened, a plurality of predetermined times may be provided, and the power of the memory 5 may be turned off step by step. . Thereby, it is possible to suppress the power of the plurality of memories 5 from being turned off at a time, and to suppress the power consumption in the memory 5 while maintaining the activation of the electric system.

  Further, at the time of preliminary activation, the case 1 is set when the driver's seat door is opened. However, the case 1 may be set according to an operation by a keyless entry system or a smart entry system, for example. Further, the memory usage amount may be estimated based on the type (position) of the door to be unlocked. Also by this, the same effect as the above embodiment can be obtained.

  When the ignition switch is turned off, the memory 5 that is not used is turned off. Thereby, the power consumption in the memory 5 can be suppressed.

  Further, for example, the vehicle may be a hybrid vehicle on which an engine and an electric motor are mounted, or an electric vehicle on which only an electric motor is mounted. The switch for starting the vehicle in these automobiles may be a start switch pressed twice or long pressed, or may be a start switch provided separately for starting. Moreover, it is good also as the time of preliminary starting by the ON information of the start switch which starts the audio | voice which is pressed once or shortly and is not vehicle starting, the navigation system 20, an air conditioning system, etc.

  In the navigation system power control, the CPU 7 controls the display scale of the map displayed on the screen of the navigation system 20, the vehicle speed, the shift lever position, the lighting state of the hazard lamp, the operation of the direction indicator, the acceleration, etc. The memory usage may be estimated based on the above.

  For example, when the shift lever position is in the P range or R range, when the vehicle speed is low, or when the hazard lamp is lit, the information to be updated by the navigation system 20 is small and the processing load is small. Estimates that the memory usage is small. Therefore, in such a case, the CPU 7 reduces the memory 5 that is turned on. Thereby, the power consumption in the memory 5 can be suppressed.

  Further, when the direction indicator is operated or when the acceleration is large, for example, the route search may be performed again in the navigation system 20 and the processing load increases. Estimated to be large. Therefore, in such a case, the CPU 7 increases the memory 5 that is turned on. Thereby, for example, a route re-search can be quickly performed.

  Further, the CPU 7 may estimate the memory usage amount in the navigation system 20 based on the plurality of vehicle information described above. In this case, the CPU 7 may estimate the memory usage by weighting the vehicle information. For example, the importance of the vehicle position information may be greater than the operation of the direction indicator. Thereby, the power consumption in the memory 5 can be suppressed while maintaining the display function in the navigation system 20.

  In the power control corresponding to the number of passengers, the CPU 7 performs image processing on the voice of the passenger identified by performing voice recognition processing on the voice data in the vehicle acquired by the microphone and the image data acquired by the in-vehicle camera. Information on the number of passengers may be acquired from the person identified by doing. As a result, the number of passengers can be acquired more accurately.

  Further, the navigation system 20 and the in-vehicle communication device 30 may each have a configuration of the power supply control device 1 or the power supply control device 1 described above. The usage amount may be estimated, and the power source of the memory 5 may be turned ON and OFF by the above method. That is, each power supply control described above may be performed by a plurality of devices.

  Further, for example, the power of the memory 5 once turned on may not be turned off, and the memory 5 may be in a self-refresh mode in which the power is not completely turned off. The self-refresh mode is a mode that retains data when the power is turned on and prohibits data writing and reading. Thereby, the power source of the memory 5 can be quickly turned on, and the control process can be performed quickly.

  Moreover, the said embodiment can also be applied to an electric vehicle. The cruising distance can be increased by suppressing the power consumption in the memory 5 by the power control.

  The power supply control device 1 includes a computer-readable storage medium that stores a program for realizing the processing described above. The CPU 7 can execute the above-described processing by reading the program stored in the storage medium. The computer-readable storage medium is a semiconductor memory such as the above-described ROM, a magnetic disk, a magneto-optical disk, or the like.

  Further effects and modifications can be easily derived by those skilled in the art. Thus, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications can be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

1: Power control device 2: Storage battery 3: Main power management unit 5: Memory 6: Sub switch 7: CPU
7a: acquisition unit 7b: estimation unit 7c: switching unit 20: navigation system 30: in-vehicle communication device 40: terminal device 50: vehicle system

Claims (16)

An acquisition unit for acquiring vehicle information;
An estimation unit for estimating a memory usage amount for a volatile memory based on the vehicle information;
A power supply control device comprising: a switching unit that switches on and off a power supply to the volatile memory based on the memory usage estimated by the estimation unit. The switching unit is
The power supply control device according to claim 1, wherein the power supply is switched on and off for each of the plurality of volatile memories based on the memory usage estimated by the estimation unit. The switching unit is
3. The power supply control device according to claim 1, wherein the power supply for the volatile memory is switched between ON and OFF at the time of preliminary start-up for starting the electric system before the switch for starting the vehicle is turned ON. . The acquisition unit
The power supply control device according to claim 3, wherein the vehicle information related to opening / closing of a vehicle door corresponding to the preliminary activation is acquired. The estimation unit includes
The power supply control device according to claim 4, wherein the memory usage is estimated based on a position of a door that is opened or unlocked. The switching unit is
6. The power source of the volatile memory that is turned on is turned off when the switch is not turned on until a predetermined time elapses after the vehicle door is opened. 6. The power supply control device described in 1. The acquisition unit
Obtaining the vehicle information relating to the storage amount of the storage battery;
The switching unit is
The power supply according to any one of claims 4 to 6, wherein when the amount of stored electricity is smaller than a predetermined amount, the number of the volatile memories to be turned on is reduced as compared with a case where the stored amount is larger. Control device. The acquisition unit
Obtaining the vehicle information about the number of passengers,
The estimation unit includes
The power supply control device according to claim 1, wherein the memory usage is estimated based on the number of passengers. The acquisition unit
Obtaining the vehicle information related to the number of passengers based on the connection state between the in-vehicle communication device and the terminal device of the passenger;
The estimation unit includes
The power supply control device according to claim 8, wherein the memory usage is estimated based on the number of passengers. The acquisition unit
Obtaining the vehicle information related to the number of passengers based on the voice of the passenger;
The estimation unit includes
The power supply control device according to claim 8 or 9, wherein the memory usage is estimated based on the number of passengers. The acquisition unit
Acquire information on the number of passengers based on image data acquired by the vehicle interior camera,
The estimation unit includes
The power supply control device according to claim 8, wherein the memory usage is estimated based on the number of passengers. The acquisition unit
Obtaining the vehicle information about the position information of the navigation system;
The estimation unit includes
The power supply control device according to claim 1, wherein the memory usage is estimated based on the position information. The switching unit is
The volatile memory that is in a self-refresh mode that retains data when power is on and prohibits data writing and reading is targeted for power on. The power supply control apparatus as described in any one of 1-12. Volatile memory,
An acquisition unit for acquiring vehicle information;
An estimation unit that estimates memory usage for the volatile memory based on the vehicle information;
A power supply control system comprising: a switching unit that switches ON and OFF of power to the volatile memory based on the memory usage estimated by the estimation unit. An acquisition process for acquiring vehicle information;
An estimation step of estimating a memory usage for a volatile memory based on the vehicle information;
And a switching step of switching ON and OFF of the power source for the volatile memory based on the memory usage estimated by the estimation step. An acquisition procedure for acquiring vehicle information;
An estimation procedure for estimating memory usage for volatile memory based on the vehicle information;
A power control program for causing a computer to execute a switching procedure for switching power ON and OFF for the volatile memory based on the memory usage estimated by the estimation procedure.

Images