Control device for power supply system, program, and control method for power supply system

Abstract

To provide a control device for a power supply system capable of appropriately suppressing deterioration of a power storage unit.SOLUTION: A power supply system 10 includes a low-voltage battery 23 that stores electric power for operating an electric load 20, and a DC-DC converter 24 that is controlled to charge the low-voltage battery 23 when a start switch 30 is turned on. The electric load 20 is capable of operating with power supplied from the low-voltage battery 23 regardless of a state where the start switch 30 is turned on or off. A control device 22 of the power supply system 10 includes: an acquisition unit that acquires prediction information for predicting a usage state of the low-voltage battery 23 after the start switch 30 is turned off; and an adjustment unit that adjusts a power storage amount of the low-voltage battery 23 by controlling the DC-DC converter 24 during a period in which the start switch 30 is turned on, on the basis of the acquired prediction information.SELECTED DRAWING: Figure 1

Description

[Technical Field] 【0001】 The present disclosure relates to a control device for a power supply system, a program, and a control method for a power supply system. [Background technology] 【0002】 Conventionally, power supply systems mounted on vehicles and the like are known. For example, a power supply system is known that supplies power to an electrical load from a battery that is a power supply source for an on-board main engine when a start switch is turned off by a user. An example of such a technology is disclosed in Patent Document 1. [Prior art documents] [Patent documents] 【0003】 [Patent Document 1] Japanese Patent Application Publication No. 2019-205275 Summary of the Invention [Problem to be solved by the invention] 【0004】 In a power supply system including a power storage unit that stores power for operating an electrical load, a technique is desired that can appropriately suppress deterioration of the power storage unit. 【0005】 It is also desirable to appropriately suppress deterioration of the power storage unit in power supply systems other than in-vehicle power supply systems. 【0006】 An object of the present disclosure is to provide a control device for a power supply system, a program, and a control method for a power supply system that can appropriately suppress deterioration of a power storage unit. [Means for solving the problem] 【0007】 The present disclosure provides: a power storage unit that stores power for operating an electrical load; a charging unit that is controlled to charge the power storage unit when a start switch operated by a user is turned on; A power supply system control device applied to a power supply system including: the electrical load is a load that can be operated by receiving power from the power storage unit regardless of whether the start switch is on or off, an acquisition unit that acquires prediction information for predicting a usage state of the power storage unit after the start switch is turned off; an adjustment unit that adjusts the amount of electricity stored in the electricity storage unit by controlling the charging unit while the start switch is turned on based on the acquired prediction information; Equipped with. 【0008】 In the above-described power supply system, the electric load can be operated using the power storage unit as a power source regardless of whether the start switch is on or off. While the start switch is off, the power storage unit is not charged by the charging unit, and the power storage unit may be excessively discharged. In this case, the power storage unit may deteriorate. Therefore, it is desirable to perform control in the power supply system to suppress deterioration of the power storage unit. 【0009】 In order to suppress deterioration of the power storage unit, it is conceivable to start the charging unit while the start switch is off to charge the power storage unit. However, in this case, the power consumption of the power supply system may increase due to the charging unit being started while the start switch is off. Therefore, there is a concern that the deterioration of the power storage unit may not be suppressed appropriately. 【0010】 Therefore, in the present disclosure, prediction information is acquired to predict the usage status of the power storage unit after the start switch is turned off. Based on the acquired prediction information, the charging unit is controlled while the start switch is turned on, thereby adjusting the amount of electricity stored in the power storage unit. In this case, it is possible to charge the power storage unit in advance while the start switch is turned on, by an amount of electricity that will be consumed by the use of the electrical load while the start switch is turned off. This makes it possible to prevent the charging unit from being activated while preventing the power storage unit from being excessively discharged while the start switch is turned off. Therefore, it is possible to reduce power consumption of the power supply system while suppressing deterioration of the power storage unit. As a result, deterioration of the power storage unit can be appropriately suppressed. [Brief explanation of the drawings] 【0011】 [Figure 1] Overall configuration diagram of the power supply system. [Figure 2] FIG. 2 is a diagram showing functions of a control device. [Figure 3] 10 is a time chart showing the operation of a comparative example. [Figure 4] 10 is a time chart showing the operation of a comparative example. [Figure 5] 4 is a flowchart showing a control processing procedure performed by the control device. [Figure 6] 4 is a time chart showing an example of the operation of the power supply system. [Figure 7] FIG. 4 is a diagram showing the relationship between the SOC, temperature, and deterioration rate of a low-voltage battery. DETAILED DESCRIPTION OF THE INVENTION 【0012】 Hereinafter, an embodiment of a control device according to the present disclosure will be described with reference to the drawings. In this embodiment, the control device is applied to an on-board power supply system. The power supply system is installed in an electric vehicle that uses a motor as a driving power source. 【0013】 As shown in FIG. 1, the power supply system 10 includes a high-voltage battery 11 (corresponding to a "high-voltage storage unit"), a power control unit 12, a rotating electric machine 13, and a smoothing capacitor 14. The high-voltage battery 11 is, for example, a battery pack including a series connection of unit cells. The unit cell is a single battery cell or a series connection of multiple battery cells. The battery cell is, for example, a secondary battery such as a lithium-ion battery. The rated voltage of the high-voltage battery 11 is, for example, several hundred volts. The high-voltage battery 11 supplies power to the rotating electric machine 13 via the power control unit 12. 【0014】 The rotating electric machine 13 is an in-vehicle main motor. The armature windings of each phase of the rotating electric machine 13 are connected to the power control unit 12. The rotor of the rotating electric machine 13 is capable of transmitting power to the drive wheels of the vehicle. The rotating electric machine 13 operates using the high-voltage battery 11 as a power source and transmits power to the drive wheels of the vehicle. The rotating electric machine 13 also functions as a generator that generates regenerative power while the vehicle is running. The rotating electric machine 13 is, for example, a permanent magnet synchronous machine. 【0015】 The power control unit 12 is connected to the high-voltage battery 11. In this embodiment, the positive terminal of the high-voltage battery 11 is connected to the positive side of the power control unit 12 via a high-potential side path 15H. The negative terminal of the high-voltage battery 11 is connected to the negative side of the power control unit 12 via a low-potential side path 15L. 【0016】 The power control unit 12 performs power conversion of the power supplied from the high-voltage battery 11 to the rotating electric machine 13 in accordance with a control signal from a control device 22 provided in the power supply system 10. For example, the power control unit 12 includes an inverter and a boost converter. The inverter converts DC power supplied from the high-voltage battery 11 into AC power and supplies the power to the armature winding of the rotating electric machine 13. The boost converter boosts the DC voltage supplied to the inverter to a voltage higher than the output voltage of the high-voltage battery 11. 【0017】 The smoothing capacitor 14 is connected in parallel to the power control unit 12 on the DC side of the power control unit 12. Specifically, a first end of the smoothing capacitor 14 is connected to the high-potential side path 15H. A second end of the smoothing capacitor 14 is connected to the low-potential side path 15L. 【0018】 The power supply system 10 includes a power switch 16. The power switch 16 is provided in the high-potential side path 15H, between a connection point with a first end of the smoothing capacitor 14 and a positive terminal of the high-voltage battery 11. The power switch 16 is also provided in the low-potential side path 15L, between a connection point with a second end of the smoothing capacitor 14 and a negative terminal of the high-voltage battery 11. When the power switch 16 is turned off, it blocks bidirectional current flow, and when turned on, it allows bidirectional current flow. For example, the power switch 16 is a relay or a semiconductor switching element. The power switch 16 is controlled by a control device 22. 【0019】 The power supply system 10 includes an electric load 20, a low-voltage battery 23, and a DC-DC converter 24. The DC-DC converter 24 is connected to the high-voltage battery 11 via paths 15H and 15L and a power switch 16. The DC-DC converter 24 is also connected to the electric load 20 and the low-voltage battery 23. The DC-DC converter 24 steps down the voltage of the high-voltage battery 11 and supplies the stepped-down voltage to the electric load 20 and the low-voltage battery 23. For example, the DC-DC converter 24 steps down the voltage of the high-voltage battery 11 to a voltage of 12V to 14V. In this embodiment, the low-voltage battery 23 corresponds to a "low-voltage power storage unit." The high-voltage battery 11 and the DC-DC converter 24 correspond to a "charging unit." 【0020】 The low-voltage battery 23 receives power from the DC-DC converter 24 and stores power for operating the electrical load 20. The rated voltage of the low-voltage battery 23 is lower than that of the high-voltage battery 11, for example, 12 V. The low-voltage battery 23 is a rechargeable storage battery, for example, a lead storage battery or a lithium-ion storage battery. 【0021】 The electric load 20 is a load that can operate by receiving power from a low-voltage battery 23 and a DC-DC converter 24, and includes an in-vehicle device 21 and a control device 22. For example, the in-vehicle device 21 is a battery monitoring device, a surroundings monitoring device, a driving assistance device, etc. The battery monitoring device monitors the state of the high-voltage battery 11. The surroundings monitoring device includes at least one of a camera for monitoring the situation around the vehicle, a laser radar such as LIDAR (Laser Imaging Detection and Ranging), and a millimeter-wave radar, and monitors the situation around the vehicle. The driving assistance device includes an electric power steering device that generates an assist torque to assist the driver's steering, an electric brake device that applies braking force to the wheels, a navigation device, etc., and provides driving assistance to the driver of the vehicle. 【0022】 Furthermore, for example, the in-vehicle equipment 21 may be a general electrical load, specifically, an air conditioner, an audio device, a power window, an electric fan of a radiator that cools the engine coolant, a stop lamp, an interior light, a USB power socket, and a motor that drives a mirror provided outside the vehicle cabin, etc. 【0023】 The control device 22 is an electronic control unit (ECU) that performs various controls of the power supply system 10, and includes a processor and a storage unit as hardware. In the power supply system 10, each device can be controlled by an ECU corresponding to the power control unit 12, the DC-DC converter 24, and each on-board device 21. However, for convenience, FIG. 1 shows multiple ECUs as one control device 22. In FIG. 2, various ECUs 40, 50, 60, 70, and 80 are shown as examples of the control device 22. 【0024】 The memory unit of the control device 22 includes a memory and a storage as hardware. The memory is a storage device for storing data used in the processing of the control device 22. The memory provides the processor with a working area for temporary use when the processor performs processing, for example. The memory includes, for example, a ROM or RAM. The storage is a storage device for storing various programs and data to be read and executed by the processor, and is a non-transitory tangible storage medium. The storage includes, for example, a HDD or flash memory. The storage stores program information and the like for performing processing described later in FIGS. 2 and 5, etc. Note that FIG. 2 shows memory units 42, 52, 62, 72, and 82 included in each of the ECUs 40, 50, 60, 70, and 80. The memory units 42, 52, 62, 72, and 82 store program information and the like for processing performed by the corresponding ECU. 【0025】 For example, program information stored in a non-transient physical recording medium is installed in the storage unit of the control device 22. The recording medium is, for example, a USB memory, a CD-ROM, or a DVD. Also, for example, program information transmitted via a communication network, such as over the air (OTA), is installed in the storage unit. 【0026】 The power supply system 10 includes a start switch 30 and a temperature sensor 31. The start switch 30 is, for example, an ignition switch or a push-button start switch, and is operated by the vehicle user. The temperature sensor 31 detects the temperature of the low-voltage battery 23. A signal notifying that the start switch 30 has been turned on or off and the detected value of the temperature sensor 31 are input to the control device 22. 【0027】 When a signal indicating that the start switch 30 has been turned off is input, the control device 22 turns off the power switch 16. This electrically disconnects the high-voltage battery 11 from the power control unit 12 and the DCDC converter 24. In this case, charging of the low-voltage battery 23 by the DCDC converter 24 is stopped. When a signal indicating that the start switch 30 has been turned on is input, the control device 22 turns on the power switch 16. This electrically connects the high-voltage battery 11 to the power control unit 12 and the DCDC converter 24. In this case, a state is established in which charging of the low-voltage battery 23 by the DCDC converter 24 is possible. 【0028】 The control performed by the control device 22 will be described in detail below with reference to FIG. 【0029】 The control device 22 has a low-voltage ECU 40. The low-voltage ECU 40 is an ECU that controls the SOC (corresponding to "charge capacity") of the low-voltage battery 23, and includes a control unit 41 and a storage unit 42. The control unit 41 includes a processor as hardware, and controls the low-voltage battery 23 and the DC-DC converter 24 by reading and executing program information stored in the storage unit 42. 【0030】 Specifically, the control unit 41 of the low-voltage ECU 40 functions as a setting unit 41A, a charge instruction unit 41B, a low-voltage charge execution unit 41C, a full-charge detection unit 41D, a charge stop unit 41E, a load use detection unit 41F, and a discharge execution unit 41G. The setting unit 41A sets a target value for the SOC of the low-voltage battery 23. The charge instruction unit 41B calculates the SOC of the low-voltage battery 23 based on a detection value of a voltage sensor that detects the voltage of the low-voltage battery 23 and a detection value of a current sensor that detects the current flowing through the low-voltage battery 23. If the calculated SOC deviates from the target value, the charge instruction unit 41B instructs the low-voltage charge execution unit 41C to charge the low-voltage battery 23. The low-voltage charge execution unit 41C charges the low-voltage battery 23 by controlling the DC-DC converter 24 based on the instruction of the charge instruction unit 41B. The method for setting the target SOC value will be described later. 【0031】 The full charge detection unit 41D detects that the SOC of the low-voltage battery 23 has reached a target value or an upper limit value. The upper limit value is a value higher than the target value for the SOC of the low-voltage battery 23. For example, the upper limit value is set to prevent the low-voltage battery 23 from being deteriorated due to charging the low-voltage battery 23 beyond the upper limit value of the SOC. When it is detected that the SOC of the low-voltage battery 23 has reached the target value or the upper limit value, the charge stop unit 41E controls the DC-DC converter 24 to stop charging of the low-voltage battery 23. The load use detection unit 41F detects whether or not there is a request to use the electric load 20. When there is a request to use the electric load 20, the discharge execution unit 41G allows the low-voltage battery 23 to discharge. 【0032】 2 illustrates, as the control device 22, a high-voltage ECU 50, a battery monitoring ECU 60, a surroundings monitoring ECU 70, and a driving assistance ECU 80 in addition to the low-voltage ECU 40. The high-voltage ECU 50 is an ECU that controls devices constituting the high-voltage system, such as the power control unit 12, and includes a control unit 51 and a storage unit 52. The control unit 51 includes a processor as hardware, and controls the power control unit 12 by reading and executing program information stored in the storage unit 52. 【0033】 Specifically, the control unit 51 of the high-voltage ECU 50 functions as a setting unit 51A, a charge / discharge instruction unit 51B, a charge / discharge execution unit 51C, an external charge detection unit 51D, an external charge execution unit 51E, a full charge detection unit 51F, and a charge stop unit 51G. The setting unit 51A sets a target value for the SOC of the high-voltage battery 11. For example, the setting unit 51A sets the target value for the SOC of the high-voltage battery 11 to a value suitable for suppressing deterioration of the high-voltage battery 11. The charge / discharge instruction unit 51B instructs the charge / discharge execution unit 51C to charge / discharge the high-voltage battery 11 so that the SOC of the high-voltage battery 11 is controlled to the set target value. The charge / discharge execution unit 51C charges / discharges the high-voltage battery 11 by controlling the power control unit 12 based on instructions from the charge / discharge instruction unit 51B and a drive request for the rotating electric machine 13. 【0034】 The external charging detection unit 51D detects that an external charger has been connected to the high-voltage battery 11. The external charger is, for example, a stationary charger provided outside the vehicle. The external charging execution unit 51E executes charging of the high-voltage battery 11 when the external charger is connected to the high-voltage battery 11. The full charge detection unit 51F detects that the SOC of the high-voltage battery 11 has reached a target value or an upper limit value. The upper limit value is a value higher than the target value for the SOC of the high-voltage battery 11. The upper limit value is set, for example, to prevent the high-voltage battery 11 from being deteriorated by being charged beyond the SOC upper limit value. The charging stop unit 51G stops charging of the high-voltage battery 11 when it detects that the SOC of the high-voltage battery 11 has reached the target value or the upper limit value. For example, the charging stop unit 51G stops charging of the high-voltage battery 11 using regenerative power generation by the rotating electric machine 13 or stops charging of the high-voltage battery 11 using the external charger. 【0035】 The battery monitoring ECU 60 is an ECU that controls the battery monitoring device and includes a control unit 61 and a storage unit 62. The control unit 61 includes a processor as hardware, and performs processing for controlling the battery monitoring device by reading and executing program information stored in the storage unit 62. For example, the control unit 61 of the battery monitoring ECU 60 performs processing for acquiring the current value flowing through the high-voltage battery 11, acquiring the voltage value of each battery cell that constitutes the high-voltage battery 11, and calculating the SOC of each battery cell based on the acquired current value and voltage value. The control unit 61 also performs processing for transmitting the calculated SOC of the high-voltage battery 11 to the high-voltage ECU 50. 【0036】 The periphery monitoring ECU 70 is an ECU that controls the periphery monitoring device, and includes a control unit 71 and a storage unit 72. The control unit 71 includes a processor as hardware, and performs processing for controlling the periphery monitoring device by reading and executing program information stored in the storage unit 72. For example, after the power switch 16 is turned off by the user, the control unit 71 of the periphery monitoring ECU 70 performs processing to monitor the conditions around the vehicle in order to assist the vehicle occupant in getting out of the vehicle. 【0037】 The driving assistance ECU 80 is an ECU that controls the driving assistance device, and includes a control unit 81 and a storage unit 82. The control unit 81 includes a processor as hardware, and performs processing for controlling the driving assistance device by reading and executing program information stored in the storage unit 82. 【0038】 To explain a navigation device as an example of a driving assistance device, map information including road information is stored in a memory unit 82 (e.g., storage) of a driving assistance ECU 80. A control unit 81 performs processing to acquire current vehicle position information and weather information detected by a receiving device provided in the navigation device. The control unit 81 performs processing to determine a planned driving route for the vehicle based on destination information set in advance by the occupant and the current position of the vehicle detected by the receiving device. 【0039】 The receiving device is a GPS receiving device, such as a GNSS (Global Navigation Satellite System) receiving device, and can receive positioning signals from a satellite positioning system that determines the current position on the ground using artificial satellites. 【0040】 The control device 22 includes a communication unit 25. The communication unit 25 functions as an interface for transmitting and receiving data between each of the ECUs 40, 50, 60, 70, and 80 and an external communication device. The communication unit 25 and each of the ECUs 40, 50, 60, 70, and 80 can exchange information with each other using a predetermined communication format (e.g., CAN). 【0041】 2 shows a server 91 outside the vehicle in addition to the control device 22. The server 91 performs a process of transmitting update program information to the control device 22 in order to update the software of each of the ECUs 40, 50, 60, 70, and 80. The server 91 is provided in, for example, an OTA center. The server 91 includes a control unit 92, a storage unit 93, and a communication unit 94. 【0042】 The storage unit 93 includes a memory and storage as hardware. The control unit 92 includes a processor as hardware, and reads and executes program information stored in the storage unit 93. The communication unit 94 functions as an interface for transmitting and receiving data to and from external communication devices. 【0043】 The control device 22 and the server 91 are connected to each other so as to be able to communicate with each other via a communication network 90 (e.g., the Internet). The communication network 90 is at least one of a wired network and a wireless network. The control unit 92 performs processing to transmit update program information to the communication unit 25 of the control device 22 via the communication unit 94. 【0044】 In the above-described power supply system 10, the electric load 20 can be operated using the low-voltage battery 23 as a power source regardless of whether the start switch 30 is on or off. While the start switch 30 is off, the low-voltage battery 23 is not charged by the DC-DC converter 24, and therefore the low-voltage battery 23 may be excessively discharged. In this case, the low-voltage battery 23 may be deteriorated. 【0045】 Specifically, a case will be described in which an update process for updating the software of the control device 22 is performed while the vehicle is parked. Fig. 3 is a diagram showing the operation of a comparative example in which the low-voltage battery 23 is excessively discharged while the vehicle is parked. In Fig. 3, (a) shows the transition of the SOC of the high-voltage battery 11, (b) shows the transition of the SOC of the low-voltage battery 23, (c) shows the on / off of the power switch 16, (d) shows the operating state of the DC-DC converter 24, (e) shows the start-up state of the battery monitoring ECU 60, and (f) shows the on / off of the start switch 30. 【0046】 Before time t1, the start switch 30 is turned on. In this case, the high-voltage battery 11 is discharged as the vehicle travels, and the high-voltage battery 11 is charged with power regenerated by the rotating electric machine 13. Therefore, the SOC of the high-voltage battery 11 fluctuates around the target value SOCa. Furthermore, the low-voltage battery 23 is discharged as the electric load 20 operates, and the low-voltage battery 23 is charged by the DC-DC converter 24. Therefore, the SOC of the low-voltage battery 23 fluctuates around the target value SOCb. Here, it is assumed that, before time t1, the control device 22 receives update program information for at least one of the ECUs 40, 50, 60, 70, and 80 from the server 91. 【0047】 At time t1, the vehicle is parked and the user turns off the start switch 30. In this case, the power switch 16 is turned off, the operation of the DC-DC converter 24 is stopped, and the battery monitoring ECU 60 is put into a stopped state. 【0048】 At time t2 while the vehicle is parked, the control device 22 starts a software update process. The software update process is a process of rewriting the program information stored in the storage unit of the ECU with the received program information for update. The ECU that performs the software update process consumes power. 【0049】 3, when software update processing is performed using the low-voltage battery 23 as a power source, if the target value SOCb for the SOC of the low-voltage battery 23 is not set appropriately, the SOC of the low-voltage battery 23 will drop to a lower limit SOCL. For example, if the SOC of the low-voltage battery 23 drops to the lower limit SOCL, the low-voltage battery 23 may be excessively discharged, which may cause deterioration of the low-voltage battery 23. Therefore, it is desirable that the power supply system 10 perform control to suppress deterioration of the low-voltage battery 23. 【0050】 In the comparative example shown in Fig. 4, the power switch 16 is turned on at time t2 to prevent the low-voltage battery 23 from entering an over-discharge state. As a result, during the software update process, power is supplied from the high-voltage battery 11 to the control device 22 and the low-voltage battery 23 via the DC-DC converter 24. Note that in Fig. 4, (a) to (f) correspond to Fig. 3 (a) to (f). 【0051】 4, however, while the start switch 30 is off, the power switch 16 is turned on, the DC-DC converter 24 is operated, and the battery monitoring ECU 60 is started, which may increase the power consumption of the power supply system 10. Furthermore, the number of times power is drawn from the high-voltage battery 11 to the low-voltage battery 23 increases, which may cause deterioration of the high-voltage battery 11. Therefore, there is a concern that deterioration of the low-voltage battery 23 may not be appropriately suppressed. 【0052】 Therefore, in this embodiment, the low-voltage ECU 40 has the following characteristic configuration to appropriately suppress deterioration of the low-voltage battery 23. 【0053】 Returning to the explanation of FIG. 2 , the control unit 41 of the low-voltage ECU 40 functions as an acquisition unit 41H. The acquisition unit 41H acquires prediction information for predicting the usage status of the low-voltage battery 23 while the start switch 30 is turned off. In this embodiment, the prediction information is information related to the software update process, and more specifically, is received information indicating that program information for the update has been received from the server 91. For example, the acquisition unit 41H acquires the received information from the ECU among the ECUs 40, 50, 60, 70, and 80 in which the program information is to be updated, or from the communication unit 25. 【0054】 When the power consumption of the control device 22 predicted from the acquired prediction information is large, the setting unit 41A sets a higher target value SOCb for the SOC of the low-voltage battery 23 compared to when the power consumption of the control device 22 is small. More specifically, when update program information is received from the server 91, it is predicted that the power consumption of the control device 22 will increase as a result of the software update process being performed while the vehicle is parked. Therefore, when reception information indicating that update program information has been received from the server 91 is acquired, the setting unit 41A sets a higher target value SOCb for the SOC of the low-voltage battery 23 compared to when reception information of program information is not acquired. 【0055】 For example, when reception information of program information is not acquired, the setting unit 41A sets the target value SOCb to 50%, whereas when reception information of program information is acquired, the setting unit 41A sets the target value SOCb to 60%. 【0056】 5 shows the procedure of the control performed by the low-voltage ECU 40. This control is repeatedly executed at predetermined intervals. 【0057】 In step S10, the charge instruction unit 41B calculates the SOC of the low-voltage battery 23. In step S11, the full charge detection unit 41D determines whether the low-voltage battery 23 is fully charged. Here, if it is determined that the calculated SOC of the low-voltage battery 23 is equal to or greater than a predetermined upper limit, it is determined that the low-voltage battery 23 is fully charged. 【0058】 If the determination in step S11 is affirmative, the process proceeds to step S12. In step S12, the charging stop unit 41E stops charging of the low-voltage battery 23. On the other hand, if the determination in step S11 is negative, the process proceeds to step S13. 【0059】 In step S13, the acquisition unit 41H acquires prediction information. In this embodiment, reception information indicating that update program information has been received from the server 91 is acquired as the prediction information. 【0060】 In step S14, in the setting unit 41A, if the power consumption of the control device 22 predicted from the acquired prediction information is greater than a predetermined power threshold, the target value SOCb for the SOC of the low-voltage battery 23 is set higher than when the power consumption is equal to or less than the power threshold. 【0061】 In this embodiment, the setting unit 41A determines whether reception information indicating that update program information has been received from the server 91 has been acquired. If it is determined that reception information of the program information has not been acquired, it determines that the predicted power consumption of the control device 22 is equal to or less than the power threshold, and sets the target value SOCb of the low-voltage battery 23 to the normal value SOCb1. On the other hand, if it is determined that reception information of the program information has been acquired, it determines that the predicted power consumption of the control device 22 is greater than the power threshold, and sets the target value SOCb of the low-voltage battery 23 to the adjustment value SOCb2. The adjustment value SOCb2 is a value higher than the normal value SOCb1. 【0062】 In step S15, the low-voltage charging execution unit 41C controls the DC-DC converter 24 so that the SOC of the low-voltage battery 23 becomes the set target value SOCb. This charges the low-voltage battery 23. In this embodiment, the setting unit 41A, the charging instruction unit 41B, and the low-voltage charging execution unit 41C correspond to an "adjustment unit." 【0063】 In step S16, the charge instruction unit 41B calculates the SOC of the low-voltage battery 23. In step S17, the full charge detection unit 41D determines whether the low-voltage battery 23 is fully charged. Here, if it is determined that the calculated SOC of the low-voltage battery 23 is equal to or greater than the set target value SOCb, it is determined that the low-voltage battery 23 is fully charged. 【0064】 If the determination in step S17 is negative, the process of step S15 is executed again. On the other hand, if the determination in step S17 is positive, the process proceeds to step S12. 【0065】 Fig. 6 shows an example of the operation of the power supply system 10. In Fig. 6, (a) to (f) correspond to (a) to (f) of Fig. 3. 【0066】 At time t1, at least one of the ECUs 40, 50, 60, 70, and 80 receives update program information from the server 91. In this case, the acquisition unit 41H acquires, as prediction information, reception information indicating that the update program information has been received from the server 91. In this case, the setting unit 41A changes the target value SOCb of the SOC of the low-voltage battery 23 from the normal value SOCb1 to an adjustment value SOCb2 that is higher than the normal value SOCb1. The low-voltage charging execution unit 41C controls the DC-DC converter 24 so that the SOC of the low-voltage battery 23 becomes the adjustment value SOCb2. As a result, the SOC of the low-voltage battery 23 increases to the adjustment value SOCb2. 【0067】 At time t2, the vehicle is parked, and the user turns off the start switch 30. At a subsequent time t3, the control device 22 starts a software update process using the low-voltage battery 23 as a power source. In this case, power is consumed in the ECU performing the software update process, causing the SOC of the low-voltage battery 23 to decrease. In this embodiment, the SOC of the low-voltage battery 23 is increased to the adjustment value SOCb2 before time t2, taking into consideration that the software update process will be performed. Therefore, even if the software update process is performed while the start switch 30 is turned off, an excessive decrease in the SOC of the low-voltage battery 23 is suppressed. In FIG. 6, after time t3, the SOC of the low-voltage battery 23 is suppressed from decreasing below the normal value SOCb1 that is set when the software update process is not performed. As a result, excessive discharging of the low-voltage battery 23 is suppressed. 【0068】 According to the present embodiment described above in detail, the following effects can be obtained. 【0069】 Prediction information is acquired to predict the usage status of the low-voltage battery 23 while the start switch 30 is off. Based on the acquired prediction information, the DC-DC converter 24 is controlled while the start switch 30 is on, thereby adjusting the SOC of the low-voltage battery 23. In this case, the amount of power consumed by the use of the electric load 20 while the start switch 30 is off can be charged to the low-voltage battery 23 in advance while the start switch 30 is on. This prevents the low-voltage battery 23 from being excessively discharged while the start switch 30 is off. Furthermore, while the start switch 30 is off, the power switch 16 can be kept off, the battery monitoring ECU 60 can be kept in a stopped state, and the DC-DC converter 24 can be prevented from operating. Therefore, it is possible to reduce the power consumption of the power supply system 10 while the start switch 30 is off, while suppressing deterioration of the low-voltage battery 23. As a result, deterioration of the low-voltage battery 23 can be appropriately suppressed. 【0070】 The power supply system 10 includes a high-voltage battery 11 and a low-voltage battery 23. The low-voltage battery 23 is charged using the high-voltage battery 11 as a power source. In this configuration, it is desirable to suppress deterioration of the high-voltage battery 11 in addition to suppressing deterioration of the low-voltage battery 23. 【0071】 In this embodiment, while the start switch 30 is on, power is supplied from the high-voltage battery 11 to the low-voltage battery 23 via the DC-DC converter 24, thereby adjusting the SOC of the low-voltage battery 23. In this case, while the start switch 30 is off, it is possible to prevent the high-voltage battery 11 from being discharged in order to charge the low-voltage battery 23. This reduces the number of times power is drawn from the high-voltage battery 11 to the low-voltage battery 23. As a result, it is possible to prevent the high-voltage battery 11 from deteriorating. 【0072】 Information related to the software update process is acquired as prediction information for predicting the usage status of the low-voltage battery 23 after the start switch 30 is turned off. When the power consumption of the control device 22 predicted from the acquired prediction information is high, the target value SOCb of the SOC of the low-voltage battery 23 is set higher than when the power consumption of the control device 22 is low. In this embodiment, when reception information indicating that update program information has been received from the server 91 is acquired, the target value SOCb of the SOC of the low-voltage battery 23 is set to an adjustment value SOCb2 that is higher than the normal value SOCb1. This allows the increase in power consumption of the control device 22 due to the software update process to be accurately reflected in the SOC adjustment of the low-voltage battery 23. This makes it possible to realize a configuration that is suitable for suppressing deterioration of the low-voltage battery 23. 【0073】 <Other embodiments> The above embodiment may be modified as follows. 【0074】 In step S13 of FIG. 5 , when the acquisition unit 41H acquires reception information of the update program information, the acquisition unit 41H may further acquire, as prediction information, at least one of the data volume of the received program information and usage history information of the memory unit in the ECU where the update process is performed. For example, the acquisition unit 41H can acquire the data volume of the update program information from the ECU where the update process is performed among the ECUs 40, 50, 60, 70, and 80, or from the communication unit 25. The usage history information of the memory unit is, specifically, information indicating the number of times data has been written to the memory unit. For example, the acquisition unit 41H can acquire the usage history information of the memory unit from each of the ECUs 40, 50, 60, 70, and 80. 【0075】 In step S14, the setting unit 41A may set the adjustment value SOCb2 based on at least one of the data amount of the acquired program information and the usage history information of the storage unit. 【0076】 Specifically, it is considered that the larger the data amount of the update program information, the longer the time required for the software update process and the higher the power consumption of the ECU that performs the software update process. Therefore, in step S14, the setting unit 41A may set the adjustment value SOCb2 higher when the data amount of the update program information is greater than a predetermined data amount threshold compared to when the data amount is equal to or less than the data amount threshold. 【0077】 Furthermore, if the storage unit of the ECU in which the software update process is performed has deteriorated due to use, it is conceivable that the time required for the update process will be longer and the power consumption of the ECU will be higher. Therefore, in step S14, the setting unit 41A may set the adjustment value SOCb2 higher when the number of writes to the storage unit of the ECU in which the software update process is performed is greater than a predetermined number threshold, compared to when the number of writes to the storage unit is equal to or less than the number threshold. 【0078】 In this embodiment, at least one of the data volume of the update program information and usage history information of the storage unit in the ECU where the update process is performed is acquired as the prediction information. This makes it possible to accurately predict an increase in power consumption of the control device 22 due to the software update process. This allows the SOC of the low-voltage battery 23 to be accurately adjusted. As a result, a configuration suitable for suppressing deterioration of the low-voltage battery 23 can be realized. 【0079】 In addition to the software update process, the electric load 20 may be required to operate while the start switch 30 is off. For example, when monitoring the conditions around the vehicle to assist occupants in getting out of the vehicle, the operation of a surroundings monitoring device may be required while the start switch 30 is off. Furthermore, for example, after the start switch 30 is turned off, the operation of the in-vehicle device 21 installed in the vehicle may be requested by a user operation. 【0080】 5, the acquisition unit 41H may acquire, as prediction information, information indicating the amount of power consumed by the electric load 20 used while the start switch 30 was off. In this embodiment, the memory unit 42 of the low-voltage ECU 40 stores information indicating the power consumption and operation time of the electric load 20 used while the start switch 30 was off. The acquisition unit 41H acquires the amount of power consumption calculated based on the power consumption and operation time of the electric load 20 stored in the memory unit 42 as the amount of power consumed by the electric load 20 used while the start switch 30 was off. 【0081】 For example, the power consumption and operating time of the electric load 20 used while the start switch 30 is off can be measured values ​​actually measured when the electric load 20 is operating while the start switch 30 is off. Also, for example, the power consumption of the electric load 20 used while the start switch 30 is off can be measured values ​​actually measured when the electric load 20 is operating while the start switch 30 is off. 【0082】 In step S14, when the power consumption of the electric load 20 indicated by the acquired prediction information is greater than the power threshold, the setting unit 41A sets the target value SOCb of the SOC of the low-voltage battery 23 higher than when the power consumption of the electric load 20 is equal to or less than the power threshold. This makes it possible to adjust the SOC of the low-voltage battery 23 while the start switch 30 is off, taking into account the power consumption of the electric load 20 that may be used in the future. Therefore, a configuration suitable for suppressing deterioration of the low-voltage battery 23 can be realized. 【0083】 The acquisition unit 41H may acquire, as the prediction information, either the power consumption or the operating time of the electric load 20 used while the start switch 30 is off. Even in this case, the setting unit 41A can set a target value SOCb for the SOC of the low-voltage battery 23 based on the acquired prediction information, taking into account the amount of power consumption that may be used in the future during the off period of the start switch 30. For example, if the power consumption of the electric load 20 indicated by the acquired prediction information is higher than a predetermined power threshold, the setting unit 41A sets the target value SOCb higher than when the power consumption of the electric load 20 is equal to or less than the power threshold. Furthermore, for example, if the operating time of the electric load 20 indicated by the acquired prediction information is longer than a predetermined time threshold, the setting unit 41A sets the target value SOCb higher than when the operating time of the electric load 20 is within the time threshold. 【0084】 The acquisition unit 41H may acquire the amount of SOC decrease of the low-voltage battery 23 during the off period of the start switch 30 as prediction information indicating the amount of power consumed by the electric load 20 used during the off period of the start switch 30. Even in this case, the setting unit 41A can set the target value SOCb of the SOC of the low-voltage battery 23 based on the acquired prediction information, taking into account the amount of power consumed in the future during the off period of the start switch 30. For example, when the amount of SOC decrease of the low-voltage battery 23 indicated by the acquired prediction information is greater than a predetermined decrease threshold, the setting unit 41A sets the target value SOCb higher than when the amount of SOC decrease is equal to or less than the decrease threshold. 【0085】 In addition to over-discharge of the low-voltage battery 23, the SOC and temperature of the low-voltage battery 23 are also thought to be related factors in the deterioration of the low-voltage battery 23. FIG. 7 shows a graph comparing the deterioration rate of the low-voltage battery 23 after 10 years when the vehicle is used in a high-temperature region and when the vehicle is used in a low-temperature region. A high-temperature region is, for example, a region where the temperature of the low-voltage battery 23 may rise to 40°C or higher. A low-temperature region is, for example, a region where the temperature of the low-voltage battery 23 may fall to 0°C or lower. The deterioration rate is, for example, the SOH (State of Health) of the low-voltage battery 23. In both the high-temperature region and the low-temperature region, when the target value SOCb of the SOC of the low-voltage battery 23 is set high, the deterioration rate after 10 years is higher than when the target value SOCb is maintained low. When comparing cases where the target value SOCb of the SOC of the low-voltage battery 23 is set to the same value, the deterioration rate after 10 years is higher in the high-temperature region than in the low-temperature region. Therefore, in order to suppress deterioration of the low-voltage battery 23, when the vehicle is used in a high-temperature region, it may be desirable to set the target value SOCb of the SOC lower than when the vehicle is used in a low-temperature region. 【0086】 Furthermore, it is believed that the internal resistance of the low-voltage battery 23 increases when the temperature of the low-voltage battery 23 is low compared to when the temperature is high. Therefore, in order to use the low-voltage battery 23 appropriately, it may be desirable to set the target SOC value SOCb higher when the vehicle is used in a low-temperature area than when it is used in a high-temperature area. 【0087】 Therefore, in step S13 of FIG. 5 , the acquisition unit 41H may acquire temperature information indicating the temperature of the low-voltage battery 23 as prediction information. For example, the temperature information may be a value detected by the temperature sensor 31. Furthermore, for example, the temperature information may be information indicating whether the location where the low-voltage battery 23 is used is a high-temperature area or a low-temperature area. Specifically, the temperature information may be map information stored in the storage unit 82 of the driving assistance ECU 80 and information on the current location of the vehicle. In step S14, the setting unit 41A may set the target value SOCb of the SOC of the low-voltage battery 23 lower when the temperature of the low-voltage battery 23 indicated by the acquired temperature information is higher than a predetermined temperature threshold, compared to when the temperature of the low-voltage battery 23 is equal to or lower than the temperature threshold. In other words, the setting unit 41A may set the target value SOCb of the SOC of the low-voltage battery 23 higher when the temperature of the low-voltage battery 23 indicated by the acquired temperature information is equal to or lower than the temperature threshold, compared to when the temperature of the low-voltage battery 23 is higher than the temperature threshold. 【0088】 In this embodiment, the temperature at which the low-voltage battery 23 is used is taken into consideration when adjusting the SOC of the low-voltage battery 23. This makes it possible to prevent deterioration of the low-voltage battery 23, which would otherwise occur if the SOC of the low-voltage battery 23 were maintained high in a high-temperature area. Furthermore, in a low-temperature area where the internal resistance of the low-voltage battery 23 may increase, the SOC of the low-voltage battery 23 is maintained high, allowing the low-voltage battery 23 to be used appropriately. 【0089】 The low-voltage ECU 40 may use parameters indicating the amount of stored power, such as the amount of power and the open circuit voltage (OCV), in addition to the SOC of the low-voltage battery 23, to adjust the amount of power stored in the low-voltage battery 23. Even in this case, the low-voltage ECU 40 can execute the control for appropriately suppressing the deterioration of the low-voltage battery 23 described above. 【0090】 The low-voltage storage unit and the high-voltage storage unit are not limited to batteries, but may be, for example, a large-capacity electric double-layer capacitor, or both a storage battery and an electric double-layer capacitor. The high-voltage storage unit may also be a fuel cell. 【0091】 The power supply system is not limited to being installed in an electric vehicle, but may also be installed in a vehicle powered by an internal combustion engine, such as a gasoline-powered vehicle. In this case, an auxiliary battery for operating on-board auxiliary equipment as an electrical load is charged by an alternator. The control device of the power supply system adjusts the amount of charge stored in the battery by controlling the alternator. In this embodiment, the alternator corresponds to the "charging unit." 【0092】 The power supply system may be mounted on a vehicle other than a vehicle, and may be mounted on a moving body such as an aircraft or a ship. If the moving body is an aircraft, the rotating electric motor serves as the power source for the aircraft's flight, and if the moving body is a ship, the rotating electric motor serves as the power source for the ship's navigation. Furthermore, the power supply system is not limited to being mounted on a moving body, and can also be used as a stationary power source. 【0093】 The control unit and the method described herein may be implemented by a special-purpose computer configured by configuring a processor and memory programmed to perform one or more functions embodied in a computer program. Alternatively, the control unit and the method described herein may be implemented by a special-purpose computer configured by configuring a processor with one or more dedicated hardware logic circuits. Alternatively, the control unit and the method described herein may be implemented by one or more special-purpose computers configured by combining a processor and memory programmed to perform one or more functions with a processor configured with one or more hardware logic circuits. Furthermore, the computer program may be stored as instructions executed by a computer on a computer-readable non-transitory tangible storage medium. 【0094】 The technical ideas extracted from the above-described embodiments will be described below. [Configuration 1] a power storage unit (23) that stores power for operating the electric load (20); a charging unit (11, 24) that is controlled to charge the electricity storage unit when a start switch (30) operated by a user is turned on; A power supply system control device (40) applied to a power supply system (10) comprising: the electrical load is a load that can be operated by receiving power from the power storage unit regardless of whether the start switch is on or off, an acquisition unit (41H) that acquires prediction information for predicting a usage state of the power storage unit after the start switch is turned off; an adjusting unit (41A, 41B, 41C) that adjusts the amount of electricity stored in the electricity storage unit by controlling the charging unit while the start switch is turned on based on the acquired prediction information; A control device for a power supply system comprising: [Configuration 2] the electricity storage unit is a low-voltage electricity storage unit (23), The charging unit is a high-voltage storage unit (11) that outputs a voltage higher than that of the low-voltage storage unit; a power converter (24) that reduces the voltage of the high-voltage storage unit and outputs the reduced voltage to the low-voltage storage unit; and The control device for a power supply system according to configuration 1, wherein the adjustment unit controls the power converter based on the acquired prediction information so as to supply power from the high-voltage storage unit to the low-voltage storage unit during a period in which the start switch is turned on. [Configuration 3] the electrical load is a computer (40, 50, 60, 70, 80) whose software can be updated by program information received via a communication unit (25); the acquisition unit acquires, as the prediction information, information related to the software update process; 3. The control device for a power supply system according to claim 1, wherein the adjustment unit increases the amount of stored power in the power storage unit when the amount of power consumption of the electrical load predicted from the acquired prediction information is large compared to when the amount of power consumption is small. [Configuration 4] The electrical load has a memory unit (42, 52, 62, 72, 82) that stores the program information, 4. The control device for a power supply system according to configuration 3, wherein the acquisition unit further acquires usage history information of the storage unit as the prediction information. [Configuration 5] 5. The control device for a power supply system according to configuration 3 or 4, wherein the acquisition unit further acquires a data amount of the program information as the prediction information. [Configuration 6] the acquisition unit acquires, as the prediction information, information indicating the amount of power consumption of the electric load used during an off period of the start switch; The control device for a power supply system according to any one of configurations 1 to 5, wherein the adjustment unit increases the amount of stored electricity in the power storage unit when the amount of power consumption of the electrical load indicated by the acquired prediction information is large compared to when the amount of power consumption of the electrical load is small. [Configuration 7] the acquisition unit acquires, as the prediction information, information indicating power consumption of the electric load used during an off period of the start switch; The control device for a power supply system according to any one of configurations 1 to 5, wherein the adjustment unit increases the amount of stored electricity in the power storage unit when the power consumption of the electrical load indicated by the acquired prediction information is high compared to when the power consumption of the electrical load is low. [Configuration 8] the acquisition unit acquires, as the prediction information, information indicating an operation time of the electric load used while the start switch is off, The control device for a power supply system according to any one of configurations 1 to 5, wherein the adjustment unit increases the amount of stored electricity in the storage unit when the operation time of the electric load indicated by the acquired prediction information is long compared to when the operation time of the electric load is short. [Configuration 9] the acquisition unit acquires, as the prediction information, temperature information indicating a temperature of the power storage unit; The control device for a power supply system described in any one of configurations 1 to 7, wherein the adjustment unit reduces the amount of stored electricity in the power storage unit when the temperature of the power storage unit indicated by the acquired temperature information is high compared to when the temperature of the power storage unit is low. [Explanation of symbols] 【0095】 10...power supply system, 11...high-voltage battery, 20...electrical load, 22...control device, 23...low-voltage battery, 24...DCDC converter, 41A...setting unit, 41B...charging instruction unit, 41C...low-voltage charging execution unit, 41H...acquisition unit.

Claims

[Claim 1] A power storage unit (23) stores power to operate an electrical load (20), With the user-operated start switch (30) turned ON, the charging units (11, 24) are controlled to charge the energy storage unit, In a power supply system control device (40) applied to a power supply system (10) comprising, The aforementioned electrical load is a computer (40, 50, 60, 70, 80) that can operate by receiving power from the energy storage unit regardless of whether the start switch is on or off, and whose software can be updated by program information received via the communication unit (25). The computer has storage units (42, 52, 62, 72, 82) for storing the program information, The acquisition unit (41H) acquires information related to the software update process and information indicating the number of times data has been written to the storage unit as predictive information, Adjustment units (41A, 41B, 41C) adjust the amount of charge stored in the power storage unit by controlling the charging unit during the period when the start switch is turned on, Equipped with, The computer, during the period when the start switch is off, performs an update process to update the software using the energy storage unit as a power source. The adjustment unit is, If the power consumption of the computer predicted from the acquired information related to the software update process is large, the amount of energy stored in the energy storage unit is increased compared to when the power consumption is small. A power supply system control device that, when the number of writes to the storage unit obtained is greater than the number of writes threshold, increases the amount of energy stored in the energy storage unit compared to when the number of writes to the storage unit is less than or equal to the number of writes threshold. [Claim 2] The aforementioned energy storage unit is a low-voltage energy storage unit (23), The charging unit is A high-voltage energy storage unit (11) that outputs a higher voltage than the low-voltage energy storage unit, A power converter (24) that reduces the voltage of the high-voltage energy storage unit and outputs the reduced voltage to the low-voltage energy storage unit, It has, The control device for a power supply system according to claim 1, wherein the adjustment unit controls the power converter to supply power from the high-voltage power storage unit to the low-voltage power storage unit during the period when the start switch is turned on, based on the acquired prediction information. [Claim 3] The control device for a power supply system according to claim 1 or 2, wherein the acquisition unit further acquires the amount of data of the program information as the prediction information. [Claim 4] The acquisition unit acquires information as prediction information, which indicates the amount of power consumed by the electrical load used during the off period of the start switch. The control device for a power supply system according to claim 1 or 2, wherein the adjustment unit increases the amount of energy stored in the energy storage unit when the amount of power consumption of the electrical load indicated by the acquired prediction information is large, compared to when the amount of power consumption of the electrical load is small. [Claim 5] The acquisition unit acquires information as prediction information, which indicates the power consumption of the electrical load used during the off period of the start switch. The control device for a power supply system according to claim 1 or 2, wherein the adjustment unit increases the amount of energy stored in the energy storage unit when the power consumption of the electrical load indicated by the acquired prediction information is high, compared to when the power consumption of the electrical load is low. [Claim 6] The acquisition unit acquires information as prediction information, which indicates the operating time of the electrical load used during the off period of the start switch. The control device for a power supply system according to claim 1 or 2, wherein the adjustment unit increases the amount of energy stored in the energy storage unit when the operating time of the electrical load indicated by the acquired prediction information is long, compared to when the operating time of the electrical load is short. [Claim 7] The acquisition unit acquires temperature information indicating the temperature of the energy storage unit as prediction information. The control device for a power supply system according to claim 1 or 2, wherein the adjustment unit reduces the amount of energy stored in the energy storage unit when the temperature of the energy storage unit is high, compared to when the temperature of the energy storage unit is low. [Claim 8] A power storage unit (23) stores power to operate an electrical load (20), With the user-operated start switch (30) turned ON, the charging units (11, 24) are controlled to charge the energy storage unit, In a program applied to a power supply system (10) that includes the following: The aforementioned electrical load is a computer (40, 50, 60, 70, 80) that can operate by receiving power from the energy storage unit regardless of whether the start switch is on or off, and whose software can be updated by program information received via the communication unit (25). The computer has storage units (42, 52, 62, 72, 82) for storing the program information, The processor (41) The acquisition process includes obtaining information related to the software update process and information indicating the number of times data has been written to the storage unit as predictive information, During the period when the start switch is turned on, the charging unit is controlled to perform an adjustment process that adjusts the amount of charge stored in the power storage unit. Make it run, The computer, during the period when the start switch is off, performs an update process to update the software using the energy storage unit as a power source. The adjustment process described above is: If the power consumption of the computer predicted from the acquired information related to the software update process is large, the amount of energy stored in the energy storage unit is increased compared to when the power consumption is small. A program that, when the number of writes to the storage unit obtained is greater than the number threshold, increases the amount of energy stored in the energy storage unit compared to when the number of writes to the storage unit is less than or equal to the number threshold. [Claim 9] A power storage unit (23) stores power to operate an electrical load (20), With the user-operated start switch (30) turned ON, the charging units (11, 24) are controlled to charge the energy storage unit, In a power supply system control method applied to a power supply system (10) comprising the following: The aforementioned electrical load is a computer (40, 50, 60, 70, 80) that can operate by receiving power from the energy storage unit regardless of whether the start switch is on or off, and whose software can be updated by program information received via the communication unit (25). The computer has storage units (42, 52, 62, 72, 82) for storing the program information, The processor (41) The acquisition process includes obtaining information related to the software update process and information indicating the number of times data has been written to the storage unit as predictive information, During the period when the start switch is turned on, the charging unit is controlled to perform an adjustment process that adjusts the amount of charge stored in the power storage unit. Make it run, The computer, during the period when the start switch is off, performs an update process to update the software using the energy storage unit as a power source. The adjustment process described above is: If the power consumption of the computer predicted from the acquired information related to the software update process is large, the amount of energy stored in the energy storage unit is increased compared to when the power consumption is small. A power supply system control method, which involves increasing the amount of energy stored in the energy storage unit when the number of writes to the storage unit obtained is greater than a threshold number, compared to when the number of writes to the storage unit is less than or equal to the threshold number.

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