Control device and control method

Abstract

To provide a control device and a control method capable of effectively utilizing power charged in a sub battery.SOLUTION: A control device according to an embodiment comprises a backup control section and a surplus power supply section. When a main battery supplying power to a plurality of loads mounted on a vehicle has abnormality, the backup control section enables the power to be supplied from a sub battery to the plurality of loads. When the main battery does not have the abnormality, the surplus power supply section enables surplus power in a sub battery charged beyond a threshold of a charging state that the sub battery needs to secure to be supplied to the loads in accordance with a travel mode of the vehicle.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The disclosed embodiments relate to a control device and a control method. [Background technology]

[0002] 2. Description of the Related Art There is a vehicle power supply system that, when an abnormality occurs in a main battery that supplies power to a load provided in a vehicle, supplies power from a sub-battery to the load (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-63543 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional vehicle power supply systems, the power stored in the sub-battery cannot be effectively utilized.

[0005] One aspect of the embodiment has been made in view of the above, and aims to provide a control device and a control method that can effectively utilize the power charged in the sub-battery. [Means for solving the problem]

[0006] A control device according to an embodiment includes a backup control unit and a surplus power supply unit. When an abnormality occurs in a main battery that supplies power to a plurality of loads provided in a vehicle, the backup control unit causes a sub-battery to supply power to the plurality of loads. When an abnormality does not occur in the main battery, the surplus power supply unit causes the sub-battery to supply surplus power that has been charged in excess of a threshold for a state of charge to be secured to the loads in accordance with a driving mode of the vehicle. Effect of the Invention

[0007] Advantageous Effects of Invention A control device and a control method according to an aspect of the embodiment provide an effect of making effective use of the power charged in the sub-battery. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a control device according to an embodiment. [Diagram 2] FIG. 2 is a diagram showing a power supply path during normal operation according to the embodiment. [Diagram 3] FIG. 3 is a diagram showing a power supply path in an abnormal state according to the embodiment. [Figure 4] FIG. 4 is a diagram showing a supply path of surplus power according to the embodiment. [Diagram 5] FIG. 5 is a diagram illustrating a power supply method based on priority according to the embodiment. [Figure 6] FIG. 6 is a diagram illustrating the operation of the threshold value according to the embodiment. [Figure 7] FIG. 7 is a diagram illustrating the operation of the threshold value according to the embodiment. [Figure 8] FIG. 8 is a diagram illustrating the operation of the threshold value according to the embodiment. [Figure 9] FIG. 9 is a flowchart illustrating an example of a process executed by the control device according to the embodiment. [Figure 10] FIG. 10 is a diagram illustrating an example of the configuration of a control device according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a control device and a control method will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to the following embodiment.

[0010] The control device 1 according to the embodiment is a device that controls the supply of power from a main battery and a sub-battery mounted on a vehicle to a plurality of loads provided in the vehicle. The vehicle is an electric vehicle or a hybrid vehicle. The vehicle has at least an automatic driving mode, a manual driving mode, and a termination mode as driving modes.

[0011] The autonomous driving mode is a mode in which the vehicle control device automatically performs all of the vehicle's operations, such as driving, turning, and stopping. The manual driving mode is a mode in which the driver performs the vehicle's operations, such as driving, turning, and stopping. The termination mode is a mode in which the vehicle control device performs processing to shut down the system after the vehicle has stopped. The vehicle may have two driving modes, or four or more driving modes.

[0012] Fig. 1 is a diagram showing a configuration example of a control device according to an embodiment. Fig. 2 is a diagram showing a power supply path in a normal state according to an embodiment. Fig. 3 is a diagram showing a power supply path in an abnormal state according to an embodiment.

[0013] As shown in FIG. 1, the control device 1 is connected to a power source 100, a power supply target device 200, a vehicle control device 300, an alternator 400, a first switching device SW1, and a second switching device SW2.

[0014] The power source 100 includes a main battery 101 and a sub-battery 102. A minimum threshold value of the state of charge that should be ensured is set for the main battery 101 and the sub-battery 102. Hereinafter, each state of charge of the main battery 101 and the sub-battery 102 will be referred to as SOC (State Of Charge).

[0015] Although not shown here, the power supply 100 also includes an inverter that converts the direct current output from the main battery 101 and the sub-battery 102 into alternating current, a DC / DC converter that transforms the output direct current, and the like.

[0016] The power supply target device 200 includes a plurality of loads 20. The loads 20 include, for example, a motor for driving a vehicle, an electric steering wheel, an electric brake, an electric accelerator, and various ECUs (Electronic Control Units) for controlling these actuators.

[0017] The plurality of loads 20 also includes a camera and various sensors that recognize the situation around the vehicle in the autonomous driving mode, etc. The plurality of loads 20 also includes various lights, an air conditioner, AV (Audio Video) equipment, etc.

[0018] The vehicle control device 300 is a host ECU that performs overall control of the entire vehicle. The alternator 400 is a generator that converts the vehicle's running energy into electric energy and charges the main battery 101 and the sub-battery 102. The alternator 400 obtains the SOC of the main battery 101 and the sub-battery 102 from the power source 100, and starts charging when the SOC falls below a threshold.

[0019] The first switching device SW1 includes a first switch SWa and a second switch SWb. The first switch SWa connects the main battery 101 and the power supply target device 200 in a connectable and disconnectable manner. The second switch SWb connects the sub-battery 102 and the power supply target device 200 in a disconnectable manner. The first switch SWa and the second switch SWb are switched ON and OFF by the control device 1.

[0020] The second switching device SW2 includes a plurality of switches that enable disconnection between the sub-battery 102 and each of the loads 20 of the power supply target device 200. Each of the plurality of switches is switched between ON and OFF by the control device 1.

[0021] The control device 1 includes a microcomputer having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc., and various circuits. The control device 1 includes a plurality of processing units that function by the CPU executing a program stored in the ROM using the RAM as a working area.

[0022] Specifically, the control device 1 includes a backup control unit 2, a surplus power supply unit 3, an acquisition unit 4, a determination unit 5, and a threshold change unit 6. The backup control unit 2, the surplus power supply unit 3, the acquisition unit 4, the determination unit 5, and the threshold change unit 6 included in the control device 1 may be partially or entirely configured with hardware such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0023] The backup control unit 2, surplus power supply unit 3, acquisition unit 4, determination unit 5, and threshold change unit 6 included in the control device 1 each realize or execute the information processing action described below. Note that the internal configuration of the control device 1 is not limited to the configuration shown in Fig. 1, and may be other configurations as long as they perform the information processing described below.

[0024] The backup control unit 2 acquires the states of the main battery 101 and the sub-battery 102 from the power source 100, and if no abnormality occurs in the main battery 101, causes the main battery 101 to supply power to the power supply target device 200.

[0025] As shown in Fig. 2, the backup control unit 2 turns the first switch SWa ON and the second switch SWb OFF. At this time, the control device 1 turns OFF all the switches of the second switching device SW2. As a result, power is supplied from the main battery 101 to the power supply target device 200 as shown by the thick arrow in Fig. 2.

[0026] Furthermore, when an abnormality occurs in the main battery 101, the backup control unit 2 supplies power from the sub-battery 102 to the power supply target device 200. As shown in Fig. 3, the backup control unit 2 turns the first switch SWa OFF and the second switch SWb ON.

[0027] At this time, the control device 1 turns off all the switches of the second switching device SW2. As a result, power is supplied from the sub-battery 102 to the power supply target device 200, as shown by the thick arrow in Fig. 3. As a result, even if an abnormality occurs in the main battery 101 in the autonomous driving mode, the control device 1 can drive the vehicle to a safe place and stop the vehicle using the power supplied from the sub-battery 102.

[0028] Here, in the previous control device, when an abnormality occurs in the main battery 101, the sub-battery 102 is required to secure enough power to safely stop the vehicle, so the sub-battery 102 is used only when an abnormality occurs in the main battery 101. For this reason, it cannot be said that the previous control device effectively utilizes the power charged in the sub-battery 102.

[0029] Certainly, from the perspective of safety, it is necessary to ensure that a certain amount of power is maintained in the sub-battery 102. However, the minimum charge amount that should be maintained in the sub-battery 102 varies depending on the situation.

[0030] For example, in the automatic driving mode, it is necessary to secure the same amount of charge in the sub-battery 102 as before. On the other hand, for example, in the manual driving mode or the end mode, it is not necessary to operate the cameras, various sensors, and various actuators required for automatic driving. Therefore, the amount of charge that needs to be secured in the sub-battery 102 can be less than before.

[0031] Therefore, for example, in the manual operation mode and the termination mode, even if no abnormality occurs in the main battery 101, the control device 1 causes the sub-battery 102 to supply surplus power that has been charged beyond the SOC threshold that should be secured in the sub-battery 102 to the power supply target device 200.

[0032] The surplus power supply unit 3 acquires information indicating the current driving mode from the vehicle control device 300. When no abnormality occurs in the main battery 101, the surplus power supply unit 3 supplies surplus power exceeding the SOC threshold value to be secured in the sub-battery 102 to the load 20 in accordance with the driving mode of the vehicle.

[0033] For example, as shown in Fig. 4, when no abnormality occurs in the main battery 101, power is supplied from the main battery 101 to the power supply target device 200. At this time, if the driving mode is the manual driving mode or the end mode, the surplus power supply unit 3 turns on the switch of the second switching device SW2 to supply surplus power of the sub-battery 102 to the load 20, as shown by the thick arrow in Fig. 4.

[0034] This allows the control device 1 to effectively utilize the surplus power stored in the sub-battery 102. At this time, the surplus power supply unit 3 may be configured to turn on the second switch SWb of the first switching device SW1 to supply the surplus power of the sub-battery 102 to the load 20. However, when the surplus power supply unit 3 turns on the second switch SWb of the first switching device SW1, power is supplied from the sub-battery 102 to all the loads 20, and the consumption rate of the surplus power increases.

[0035] Therefore, the surplus power supply unit 3 efficiently supplies the surplus power of the sub-battery 102 to each load 20 by individually controlling each switch of the second switching device SW2. Specifically, the acquisition unit 4 of the control device 1 acquires the power consumption status of each of the multiple loads 20 from the power supply target device 200. The acquisition unit 4 outputs the acquired power consumption status of each load 20 to the determination unit 5.

[0036] The determination unit 5 determines the priority order of the loads to which the surplus power of the sub-battery 102 is supplied based on the power consumption status of each load 20. For example, the determination unit 5 determines the priority order such that the load 20 with the larger power consumption per unit time is given a higher priority. This enables the control device 1 to keep the discharge amount of the main battery 101 low during a temporary period until the SOC of the sub-battery 102 falls below the threshold.

[0037] The determination unit 5 can also determine the priority order such that the load 20 with the smaller power consumption per unit time is given a higher priority. This enables the control device 1 to extend the time for which the sub-battery 102 assists the main battery 101.

[0038] 5 is a diagram showing a power supply method based on priority according to the embodiment. As shown in Fig. 5, the surplus power supply unit 3 turns on the switches connecting a predetermined number of loads 20 with higher priority to the sub-battery 102, and turns off the switches connecting the other loads 20 to the sub-battery 102.

[0039] At this time, the surplus power supply unit 3 can also control the switch of the second switching device SW2 so that the surplus power is supplied from the sub-battery 102 to a larger number of loads 20 as the amount of surplus power charged in the sub-battery 102 increases.

[0040] In this way, the surplus power supply unit 3 supplies surplus power to the loads 20 in accordance with the priority order determined by the determination unit 5, so that the surplus power of the sub-battery 102 can be efficiently supplied to each load 20.

[0041] Furthermore, in the autonomous driving mode, if an abnormality occurs in the main battery 101, the control device 1 needs to continue supplying power from the sub-battery 102 to all of the loads 20 that operate to safely stop the vehicle.

[0042] In contrast, in the manual driving mode, when an abnormality occurs in the main battery 101, the control device 1 allows the driver to perform some of the operations required to safely stop the vehicle, thereby reducing the number of loads 20 to which power is supplied from the sub-battery 102.

[0043] Furthermore, in the shutdown mode, when an abnormality occurs in the main battery 101, the control device 1 can further reduce the number of loads 20 to which power is supplied from the sub-battery 102 because the vehicle is already in a stopped state.

[0044] Therefore, the threshold value changing unit 6 of the control device 1 acquires information indicating the vehicle driving mode from the vehicle control device 300, and changes the threshold value of the SOC to be secured in the sub-battery 102 according to the vehicle driving mode. In this way, the threshold value changing unit 6 can increase the amount of surplus power that can be supplied to the load 20 by lowering the threshold value, even if the SOC of the sub-battery 102 is constant.

[0045] Here, the operation of the threshold value changing unit 6 will be described with reference to Fig. 6 to Fig. 8. Fig. 6 to Fig. 8 are explanatory diagrams of the operation of the threshold value according to the embodiment. As shown in Fig. 6, for example, in the automatic driving mode, the threshold value changing unit 6 sets the threshold value of the SOC to be secured in the sub-battery 102 to 80%.

[0046] As a result, when the sub-battery 102 is in a fully charged state, it becomes possible to supply 20% of the total charged power as surplus power to the load 20. This allows the control device 1 to drive the vehicle to a safe place and stop the vehicle even if an abnormality occurs in the main battery 101 during autonomous driving.

[0047] 7, for example, when the driving mode transitions to the manual driving mode, the threshold change unit 6 sets the SOC threshold to be secured in the sub-battery 102 to 70%. As a result, when the sub-battery 102 is in a fully charged state, it becomes possible to supply 30% of the total charged power to the load 20 as surplus power.

[0048] As a result, even if an abnormality occurs in the main battery 101 during manual driving, the control device 1 can supply sufficient power from the sub-battery 102 to the load 20 until the vehicle is safely stopped by manual driving.

[0049] 8, for example, when the driving mode transitions to the end mode, the threshold change unit 6 sets the threshold of the SOC to be secured in the sub-battery 102 to 50%. As a result, when the sub-battery 102 is in a fully charged state, it becomes possible to supply 50% of the total charged power as surplus power to the load 20. This allows the control device 1 to reliably shut down the vehicle system using the surplus power of the sub-battery 102 since the vehicle is already stopped.

[0050] In this way, the threshold change unit 6 sets the threshold of the SOC to be secured in the sub-battery 102 lower in the order of the automatic driving mode, the manual driving mode, and the end mode. This allows the control device 1 to supply necessary and sufficient power from the sub-battery 102 to the load 20 in each driving mode even if an abnormality occurs in the main battery 101.

[0051] Next, an example of processing executed by the control device 1 according to the embodiment will be described with reference to Fig. 9. Fig. 9 is a flowchart showing an example of processing executed by the control device according to the embodiment. As shown in Fig. 9, when the vehicle is started, the control device 1 first determines whether the main battery 101 is normal or not (step S101).

[0052] When the control device 1 determines that the main battery 101 is not normal (step S101, No), the process proceeds to step S107. When the control device 1 determines that the main battery 101 is normal (step S101, Yes), the control device 1 causes the main battery 101 to supply power (step S102).

[0053] Next, the control device 1 acquires the vehicle driving mode from the vehicle control device 300 (step S103), and sets the SOC threshold value according to the driving mode (step S104). After that, the control device 1 determines whether the driving mode is an autonomous driving mode or not (step S105).

[0054] When the control device 1 determines that the driving mode is not the automatic driving mode (step S105, No), the process proceeds to step S107. When the control device 1 determines that the driving mode is the automatic driving mode (step S105, Yes), the control device 1 determines whether or not the driving mode has been changed to the end mode (step S106).

[0055] When the control device 1 determines that the mode has not been changed to the termination mode (step S106, No), the control device 1 moves the process to step S103. When the control device 1 determines that the mode has been changed to the termination mode (step S106, Yes), the control device 1 causes the sub-battery 102 to supply power (step S107), and determines whether the termination process has been completed (step S108).

[0056] When the control device 1 determines that the termination process is not complete (step S108, No), it repeats the determination in step S108 until the termination process is complete. When the control device 1 determines that the termination process is complete (step S108, Yes), it ends the process.

[0057] As described above, the control device according to this embodiment includes the backup control unit 2 and the surplus power supply unit 3. When an abnormality occurs in the main battery 101 that supplies power to the multiple loads 20 provided in the vehicle, the backup control unit 2 causes the sub-battery 102 to supply power to the multiple loads 20. When no abnormality occurs in the main battery 101, the surplus power supply unit 3 causes the sub-battery 102 to supply surplus power that has been charged beyond a threshold for the state of charge to be secured to the loads in accordance with the traveling mode of the vehicle. This allows the control device 1 to effectively utilize the power charged in the sub-battery 102.

[0058] The above-described embodiment is merely an example, and various modifications are possible. For example, the control device 1 may include a backup control unit 2 that causes the sub-battery 102 to supply power to the multiple loads 20 when an abnormality occurs in the main battery 101 that supplies power to the multiple loads 20 provided in the vehicle, an acquisition unit 4 that acquires the power consumption status of the multiple loads 20, and a surplus power supply unit 3 that causes the sub-battery 102 to supply surplus power that has been charged beyond a threshold value of the charging state to the loads 20 in a priority order according to the power consumption status of the loads 20 when no abnormality occurs in the main battery 101.

[0059] In other words, when no abnormality occurs in the main battery 101, the surplus power supply unit 3 supplies surplus power to the load 20 in a priority order according to the power consumption status of the load 20, regardless of the driving mode of the vehicle. With this configuration, the control device 1 can effectively utilize the power charged in the sub-battery 102 according to the power consumption status of the load 20.

[0060] In the above embodiment, the surplus power of the sub-battery 102 is supplied to the load 20, but the control device of the embodiment may be configured to supply the power of the sub-battery 102 to the load 20 not only when the surplus power is supplied, but also when the SOC of the sub-battery 102 is below a threshold value.

[0061] Hereinafter, a modified example will be described in which power of the sub-battery 102 is supplied to the load 20, not limited to the surplus power source. Fig. 10 is a diagram showing a configuration example of a control device according to a modified example of the embodiment. As shown in Fig. 10, the control device 1a according to the modified example is different from the control device 1 shown in Fig. 1 in that it has a power supply unit 31 instead of the surplus power supply unit 3 shown in Fig. 1, but the other configurations are the same as those of the control device 1 shown in Fig. 1.

[0062] The power supply unit 31 in the modified example prohibits the supply of power from the sub-battery 102 to the multiple loads 20 when the vehicle's driving mode is an autonomous driving mode and permits the supply of power from the sub-battery 102 to at least one of the multiple loads 20 when the vehicle's driving mode is a mode other than the autonomous driving mode when no abnormality has occurred in the main battery 101.

[0063] Specifically, when the vehicle's driving mode is other than the autonomous driving mode and the main battery 101 is supplying power to multiple loads 20, the power supply unit 31 turns on the switch of the second switching device SW2 for the load 20 whose voltage has dropped due to an overload or the like, and supplies power from the sub-battery 102 to the load 20 whose voltage has dropped.

[0064] More specifically, the acquiring unit 4 acquires the power consumption status of each of the plurality of loads 20 from the power supply target device 200. The deciding unit 5 decides, based on the power consumption status of each load 20, that the load 20 in which the voltage drops is to be given first priority.

[0065] The power supply unit 31 turns on the switch of the second switching device SW2 for the load 20 with the first priority determined by the determination unit 5. This causes the power of the sub-battery 102 to be supplied to the load 20, thereby preventing a voltage drop or a momentary interruption of the load 20.

[0066] Note that the load 20 whose voltage drops may not be detected by the acquisition unit 4 and the determination unit 5, but the power supply unit 31 may obtain and detect control information for controlling each load 20 from the vehicle control device 300. Specifically, the power supply unit 31 obtains driving information of the multiple loads 20 from the vehicle control device 300, which is an external device, detects a load whose voltage drops based on the driving information, and causes the sub-battery 102 to supply power to the detected load 20.

[0067] More specifically, the power supply unit 31 obtains drive information of the multiple loads 20 from the vehicle control device 300, and detects the load 20 that is driven in a manner that is expected to cause a voltage drop, such as by sudden steering. The power supply unit 31 switches on the second switching device SW2 for the load 20 that is expected to cause a voltage drop.

[0068] As a result, the power of the sub-battery 102 is supplied to the load 20, so that the power of the sub-battery 102 can be supplied to the load 20 before the voltage of the load 20 drops, making it possible to more reliably prevent voltage drops or momentary interruptions.

[0069] The process executed by the control device 1a according to the modification is basically the same as the flowchart shown in Fig. 9. In the modification, in step S107, the power supply unit 31 detects the load 20 in which the voltage drops, and causes the sub-battery 102 to supply power to the load 20.

[0070] As described above, the control device 1a according to the modified example of the embodiment includes a backup control unit 2 that causes the sub-battery 102 to supply power to the multiple loads 20 when an abnormality occurs in the main battery 101 that supplies power to the multiple loads 20 equipped in the vehicle, and a power supply unit that prohibits the sub-battery 102 from supplying power to the multiple loads 20 when the vehicle's driving mode is an autonomous driving mode when no abnormality occurs in the main battery 101, and allows the sub-battery 102 to supply power to at least one of the multiple loads 20 when the vehicle's driving mode is a mode other than the autonomous driving mode.

[0071] As a result, when the control device 1a is in the automatic driving mode, the power of the sub-battery 102 is not consumed, so that the backup time when the main battery is abnormal can be extended. Also, when the control device 1a is in a mode other than the automatic driving mode, the power charged in the sub-battery 102 can be effectively utilized.

[0072] Further advantages and modifications may readily occur to those skilled in the art. Thus, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof. [Explanation of symbols]

[0073] 1 Control device 2 Backup control section 3. Surplus Power Supply Section 31 Power supply section 4 Acquisition part 5 Decision Section 6 Threshold change section 100 power supply 101 Main battery 102 Sub battery 200 Power supply target device 20 Load 300 Vehicle control device 400 Alternator SW1 First switching device SWa First switch SWb Second switch SW2 Second switching device

Claims

1. a backup control unit that, when an abnormality occurs in a main battery that supplies power to a plurality of loads provided in a vehicle, causes the sub-battery to supply power to the plurality of loads; a surplus power supply unit that supplies surplus power, which has been charged in the sub-battery beyond a threshold value of a state of charge to be secured in the sub-battery, to the load in accordance with a driving mode of the vehicle when no abnormality has occurred in the main battery; A control device comprising:

2. An acquisition unit that acquires power consumption statuses of the plurality of loads; a determination unit that determines a priority order of the loads to which the surplus power is to be supplied based on the power consumption status; The control device according to claim 1 , further comprising:

3. A threshold value changing unit that changes the threshold value according to a driving mode of the vehicle. The control device according to claim 1 or 2, further comprising:

4. The vehicle is The driving modes include an automatic driving mode, a manual driving mode, and an end mode. having The threshold change unit is The threshold value is decreased in the order of the automatic driving mode, the manual driving mode, and the end mode.

4. The control device according to claim 3.

5. a backup control step of supplying power from the sub-battery to a plurality of loads when an abnormality occurs in a main battery that supplies power to the plurality of loads provided in the vehicle; a surplus power supply step of supplying surplus power, which has been charged in the sub-battery beyond a threshold value of a state of charge to be secured in the sub-battery, to the load in accordance with a driving mode of the vehicle when no abnormality has occurred in the main battery; A control method comprising:

6. a backup control unit that, when an abnormality occurs in a main battery that supplies power to a plurality of loads provided in a vehicle, causes the sub-battery to supply power to the plurality of loads; An acquisition unit that acquires power consumption statuses of the plurality of loads; a surplus power supply unit that supplies surplus power, which has been charged in the sub-battery beyond a threshold value of a charging state to be secured, to the load in a priority order according to a power consumption state of the load when no abnormality occurs in the main battery; A control device comprising:

7. a backup control unit that, when an abnormality occurs in a main battery that supplies power to a plurality of loads provided in a vehicle, causes the sub-battery to supply power to the plurality of loads; When no abnormality occurs in the main battery, When a driving mode of the vehicle is an autonomous driving mode, supply of power from the sub-battery to the plurality of loads is prohibited; a power supply unit that permits the supply of power from the sub-battery to at least one of the plurality of loads when a driving mode of the vehicle is a mode other than an autonomous driving mode; A control device comprising:

8. The power supply unit includes: When the main battery is supplying power to the plurality of loads, the sub-battery is caused to supply power to the load whose voltage drops. The control device according to claim 7 .

9. The power supply unit includes: Obtaining drive information of the plurality of loads from an external device, and detecting the load in which the voltage drops based on the drive information. The control device according to claim 8 .

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