Power supply control device, control method, and control program

Abstract

To provide a power supply control device and the like that can control a redundant power supply configuration for a load when a backup battery is normal in a power supply system using redundant configuration.SOLUTION: A power supply control device that controls the power supply to a vehicle load using a first battery and a second battery includes an acquisition unit that acquires the power state of a vehicle, a diagnostic unit that performs diagnosis of the second battery when the power state of the vehicle is switched from off to on, and a control unit that controls the electrical connection state between the load and the second battery, and when the second battery is diagnosed as normal by the diagnostic unit, the control unit controls the second battery to a first state in which power can be supplied to the load.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a power supply control device that controls a power supply system that includes a plurality of redundant batteries that supply power to a load in a vehicle. [Background technology]

[0002] Patent Document 1 discloses a power supply system for a vehicle that uses a first main battery and a second backup battery to provide a redundant power supply. This power supply system discloses that, during autonomous driving of the vehicle, the second battery is connected to a load together with the first battery to provide a redundant power supply. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-156228 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, various controls in vehicles (e.g., brake control) have been electrified. As a result, there are cases where a redundant power supply is required for a certain load (e.g., brake actuator) even when the vehicle is not in autonomous driving mode.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a power supply control device and the like that can control a redundant power supply configuration for a load in a power supply system using a redundant configuration when the backup battery is normal. [Means for solving the problem]

[0006] In order to solve the above problems, one aspect of the disclosed technology is a power supply control device that controls power supply to a load of a vehicle using a first battery and a second battery, and includes an acquisition unit that acquires the power supply state of the vehicle, a diagnosis unit that performs a diagnosis of the second battery when the power supply state of the vehicle switches from off to on, and a control unit that controls the electrical connection state between the load and the second battery, and when the diagnosis unit diagnoses that the second battery is normal, the control unit controls the power supply control device to a first state in which power can be supplied from the second battery to the load. Effect of the Invention

[0007] According to the power supply control device and the like of the present disclosure, in a power supply system using a redundant configuration, if the second battery is normal when the power supply state of the vehicle is on, it is possible to redundantly supply power to a load. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a power supply system including a power supply control device according to an embodiment of the present disclosure; [Diagram 2] A flowchart illustrating a power supply control process executed by the power supply control device. [Diagram 3] A diagram showing the power supply paths of the power supply system in the first state (redundant mode). [Figure 4] FIG. 2 is a diagram showing a power supply path of the power supply system in the second state (pass mode). [Diagram 5] A diagram showing the power supply path of the power supply system in the third state (backup mode) [Figure 6] FIG. 13 is a diagram for explaining an example of a condition under which the first state (redundancy mode) may be released. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The power supply control device of the present disclosure performs a diagnosis of the redundant sub-battery when the vehicle ignition switch is turned on, and if it determines that the sub-battery is normal, forms a power supply system with a redundant configuration for the primary load and the secondary load using both the main battery and the sub-battery. This makes it possible to expand the vehicle to a state where necessary functions can be backed up. Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0010] <Embodiment> [composition] Fig. 1 is a diagram showing a schematic configuration of a power supply system 10 including a power supply control device 14 according to an embodiment of the present disclosure. The power supply system 10 shown in Fig. 1 includes a first battery 11, a second battery 12, a DC-DC converter 13, a power supply control device 14, a first switch SW1, a second switch SW2, and a third switch SW3.

[0011] The power supply system 10 of the present disclosure is configured to be capable of redundantly supplying power to a first load 21 and a second load 22 that are in-vehicle devices that are provided redundantly, such as for an automatic driving function or an electric brake function.

[0012] The first battery 11 is a secondary battery configured to be chargeable and dischargeable, such as a lead storage battery. The first battery 11 is a main battery connected to be able to supply power to the first load 21 and the second load 22, regardless of whether a redundant power supply configuration is required. The first battery 11 is directly connected to the first load 21. The first battery 11 is also connected to the second load 22 via the first switch SW1 or the DCDC converter 13 and the third switch SW3. The first battery 11 is also connected to the second battery 12 via the second switch SW2 and the DCDC converter 13.

[0013] The second battery 12 is a secondary battery configured to be chargeable and dischargeable, such as a lithium ion battery. This second battery 12 is a sub-battery connected to the second load 22 so as to be able to supply power when a redundant power supply configuration is required, and is provided redundantly to back up the first battery 11. The second battery 12 is connected to the second load 22 via a third switch SW3.

[0014] The first load 21 is a device mounted on the vehicle and configured to operate on the power of the first battery 11. The second load 22 is a device mounted on the vehicle to provide a part or all of the first load 21 redundantly and configured to operate on the power of the first battery 11 and the second battery 12. This second load 22 is a load that is required to operate in place of the first load 21 that has stopped operating due to a failure of the first battery 11 or the like, and can be an important load related to the safe driving of the vehicle. For example, the second load 22 can be a load that has a function of safely evacuating the vehicle in an emergency during autonomous driving.

[0015] The first switch SW1, the second switch SW2, and the third switch SW3 are configured to be openable and closable based on the control (instruction) of the power supply control device 14. For these switches, a semiconductor relay, an excitation type mechanical relay, or the like can be used.

[0016] The DCDC converter 13 is a power converter that can convert input power into power of a predetermined voltage and output it based on the control (instruction) of the power supply control device 14. The primary side of this DCDC converter 13 is connected to the first battery 11 via the second switch SW2, and the secondary side is connected to the second battery 12. This DCDC converter 13 can be a bidirectional DCDC converter that has a function of converting the voltage of the primary side power and outputting it to the secondary side, and a function of converting the voltage of the secondary side power and outputting it to the primary side.

[0017] The power supply control device 14 is configured to control the power supply from the first battery 11 and the second battery 12 of the power supply system 10 to the first load 21 and the second load 22, based on the states of the first battery 11 and the second battery 12 and the vehicle state. This power supply control device 14 includes an acquisition unit 141, a diagnosis unit 142, a detection unit 143, a determination unit 144, and a control unit 145.

[0018] The acquisition unit 141 acquires the power supply state of the vehicle. Specifically, the acquisition unit 141 acquires information about the state of an ignition switch (IG state), which is a switch for operating the power supply system 10 of the vehicle, from other in-vehicle devices (not shown).

[0019] The diagnosis unit 142 diagnoses the first battery 11 or the second battery 12 at a predetermined timing. In this embodiment, when the power supply state of the vehicle acquired by the acquisition unit 141 switches from on (IG-ON) to off (IG-OFF), the diagnosis unit 142 diagnoses the first battery 11, and when the power supply state of the vehicle acquired by the acquisition unit 141 switches from off (IG-OFF) to on (IG-ON), the diagnosis unit 142 diagnoses the second battery 12. This diagnosis is typically performed by determining whether the battery is normal or abnormal based on physical quantities (voltage, current, temperature, etc.) indicating the battery state that can be acquired from various sensors. Note that a method for diagnosing the battery is not the main focus of the present application and therefore will not be described, but a well-known method can be used.

[0020] The detection unit 143 detects the speed of the vehicle. The speed of the vehicle can be detected, for example, by acquiring information about the vehicle speed from a vehicle speed sensor (not shown) mounted on the vehicle.

[0021] The determination unit 144 determines the parking lock state of the vehicle. This parking lock state can be determined, for example, by acquiring information on a P lock state, which indicates that the lock process of the parking brake is completed, from an electric parking brake (EPB) system.

[0022] The control unit 145 controls the DC-DC converter 13, the first switch SW1, the second switch SW2, and the third switch SW3 to control the power supply from the first battery 11 and the second battery 12 to the first load 21 and the second load 22. The control unit 145 of this embodiment controls the electrical connection state between the second battery 12 and the second load 22 based on the diagnosis result in the diagnosis unit 142. The connection states controlled by the control unit 145 include a first state (redundancy mode) in which power can be supplied from the second battery 12 to the second load 22, a second state (pass mode) in which the second battery 12 is electrically disconnected from the second load 22, and a third state (backup mode) in which power is supplied from the second battery 12 to the second load 22 in an emergency. The control of the connection states performed by the control unit 145 will be described later.

[0023] The above-mentioned power supply control device 14 typically includes a processor such as a microcomputer, a memory, an input / output interface, etc. This power supply control device 14 realizes all or part of the functions of the above-mentioned acquisition unit 141, diagnosis unit 142, detection unit 143, judgment unit 144, and control unit 145 by the processor reading and executing a program stored in the memory. Note that, in this embodiment, one control unit 145 controls the connection state of the power supply system 10, but independent control units may be provided for controlling the primary system and the secondary system.

[0024] [control] Next, the control performed by the power supply control device 14 according to this embodiment will be described with further reference to Figures 2 to 6. Figure 2 is a flowchart showing the procedure of the power supply control process executed by each component of the power supply control device 14.

[0025] (Step S201) The diagnosis unit 142 determines whether or not the power supply state of the vehicle acquired by the acquisition unit 141 has become on (IG-ON). That is, the diagnosis unit 142 determines whether or not the power supply state of the vehicle has switched from off (IG-OFF) to on (IG-ON).

[0026] If the diagnosis unit 142 determines that the vehicle's power state is on (IG-ON) (step S201, Yes), the process proceeds to step S202, and if the diagnosis unit 142 determines that the vehicle's power state is not on (IG-ON) (step S201, No), the process waits until the power state is on (IG-ON).

[0027] (Step S202) The diagnosis unit 142 performs a predetermined diagnosis process on the second battery 12. In this predetermined diagnosis process, it is diagnosed whether the second battery 12 is in a normal state in which it can be used as a backup power source for the first battery 11. For example, the diagnosis unit 142 judges whether the voltage, current, state of charge (SOC), etc. of the second battery 12 satisfy predetermined reference values.

[0028] When the second battery 12 is diagnosed by the diagnosis unit 142, the process proceeds to step S203.

[0029] (Step S203) The diagnosis unit 142 judges whether or not the second battery 12 is in a normal state based on the result of the diagnosis in the above step S202. For example, the diagnosis unit 142 can judge that the second battery 12 is in a normal state if the voltage, current, state of charge (SOC), etc. are equal to or higher than predetermined reference values.

[0030] If the diagnostic unit 142 determines that the second battery 12 is in a normal state (step S203, Yes), the process proceeds to step S204; if the diagnostic unit 142 determines that the second battery 12 is not in a normal state (step S203, No), the process proceeds to step S211.

[0031] (Step S204) The control unit 145 controls the connection states of the first battery 11, the second battery 12, the first load 21, and the second load 22 to a first state (redundant mode) in which power is supplied from the first battery 11 to the first load 21 and the second battery 12, and power can also be supplied from the second battery 12 to the second load 22.

[0032] Fig. 3 is a diagram showing a power supply path of the power supply system 10 in the first state (redundancy mode). As shown in Fig. 3, in the first state (redundancy mode), the first switch SW1 is opened, and the second switch SW2 and the third switch SW3 are closed. This path separates the primary system and the secondary system by the DCDC converter 13, and a redundant power supply configuration is formed in which power is supplied from the first battery 11 to the first load 21 of the primary system, and power is supplied in parallel from the first battery 11 and the second battery 12 via the DCDC converter 13 to the second load 22 of the secondary system.

[0033] In the redundant power supply configuration shown in the first state, even if an abnormality occurs in the primary system due to a power failure or the like, the influence of the abnormality on the secondary system is blocked by the DCDC converter 13, so that the secondary system can continue to supply power to the second load 22, thereby at least maintaining the necessary vehicle functions. Even if an abnormality occurs in the secondary system due to a power failure or the like, the influence of the abnormality on the primary system is blocked by the DCDC converter 13, so that the primary system can continue to supply power to the first load 21, thereby maintaining the vehicle functions. Note that, when no abnormality occurs in the primary system or the secondary system, power to the second load 22 is supplied from the first battery 11 via the DCDC converter 13, so that the consumption of power stored in the second battery 12 can be minimized.

[0034] When the control unit 145 controls the connection states of the first battery 11, the second battery 12, the first load 21, and the second load 22 to the first state (redundant mode), the process proceeds to step S205.

[0035] (Step S205) The control unit 145 determines whether or not a power failure has occurred due to an occurrence of a ground fault or the like in the primary system. The presence or absence of a power failure can be determined by, for example, monitoring the voltage and current of the first battery 11.

[0036] If the control unit 145 determines that a power failure has occurred in the primary system (step S205, Yes), the process proceeds to step S209; if the control unit 145 determines that a power failure has not occurred in the primary system (step S205, No), the process proceeds to step S206.

[0037] (Step S206) The control unit 145 determines whether the vehicle is in an automatic driving state. Whether the vehicle is in an automatic driving state or a manual driving state can be determined, for example, by acquiring predetermined information from another in-vehicle device (such as an automatic driving ECU) (not shown) that controls the automatic driving function.

[0038] If the control unit 145 determines that the vehicle is autonomously driving (step S206, Yes), the process proceeds to step S205. If the control unit 145 determines that the vehicle is not autonomously driving (step S206, No), the process proceeds to step S207.

[0039] (Step S207) The diagnosis unit 142 determines whether the power supply state of the vehicle acquired by the acquisition unit 141 has become off (IG-OFF). That is, the diagnosis unit 142 determines whether the power supply state of the vehicle has switched from on (IG-ON) to off (IG-OFF).

[0040] If the diagnosis unit 142 determines that the vehicle's power state has been turned off (IG-OFF) (step S207, YES), the process proceeds to step S208, and if the diagnosis unit 142 determines that the vehicle's power state has not been turned off (IG-OFF) (step S207, NO), the process proceeds to step S205.

[0041] (Step S208) The control unit 145 judges whether the vehicle satisfies a predetermined condition. The predetermined condition is a condition related to the vehicle that can be judged to be able to cancel the first state (redundant mode) in which the redundant power supply configuration is established. More specifically, the predetermined condition can mainly be exemplified by the following three conditions. Condition 1: The first battery 11 is diagnosed as normal by the diagnosis unit 142. Condition 2: The vehicle speed detected by the detection unit 143 indicates a stopped state. Condition 3: The determination unit 144 determines that the parking lock is complete.

[0042] Condition 1 is based on the idea that if the first battery 11 is normal, the possibility of using the second battery 12 is extremely low and a redundant power supply configuration is not necessary. As a method of determining this condition 1, for example, as illustrated in FIG. 6, after it is determined in the above step S207 that the power supply state of the vehicle is off (IG-OFF), the voltage of the first battery 11 may be sampled at a predetermined period (e.g., 8 ms), the number of consecutive times that the sampled voltage is equal to or higher than a predetermined normality determination threshold (e.g., 8 V), and if this consecutive number of times is equal to or higher than a predetermined number (e.g., 5 times), it may be determined that the first battery 11 is normal. Alternatively, after it is determined in the above step S207 that the power supply state of the vehicle is off (IG-OFF), the voltage of the first battery 11 may be monitored, and if the duration that the voltage is equal to or higher than the predetermined normality determination threshold is equal to or higher than a predetermined first time (e.g., 40 ms), it may be determined that the first battery 11 is normal. Note that the determination may be made using the current of the first battery 11 instead of the voltage of the first battery 11.

[0043] Condition 2 is based on the idea that a sustained extremely low vehicle speed means that the vehicle is highly likely to stop. As a method of determining Condition 2, for example, after it is determined in step S207 that the power supply state of the vehicle is off (IG-OFF), if the time during which the vehicle speed is equal to or lower than a predetermined value (e.g., 5 km / h) continues for a predetermined second time period (e.g., 5 s), it may be determined that the vehicle speed indicates a stopped state.

[0044] Condition 3 is based on the idea that a vehicle in a parking lock state is unlikely to start moving. As a method of determining whether or not this condition 3 is satisfied, for example, after it is determined in step S207 that the power supply state of the vehicle is off (IG-OFF), if it is possible to confirm that the disc brake pads of the electric brake actuator are pressed against the brake rotor, it may be determined that the parking lock has been completed.

[0045] In addition, other conditions may be that a signal indicating that power supply redundancy for the load is no longer required has been received from an electronic control unit ECU (not shown) that controls the autonomous driving.

[0046] If the control unit 145 determines that the vehicle satisfies the predetermined conditions (step S208, Yes), the process proceeds to step S211; if the control unit 145 determines that the vehicle does not satisfy the predetermined conditions (step S208, No), the process proceeds to step S205.

[0047] (Step S209) The control unit 145 controls the connection state of the first battery 11, the second battery 12, the first load 21, and the second load 22 to a third state (backup mode) in which the first battery 11 and the second battery 12 are electrically isolated from each other and power is supplied from the second battery 12 to the second load 22.

[0048] Fig. 5 is a diagram showing a power supply path of the power supply system 10 in the third state (backup mode). As shown in Fig. 5, in the third state (backup mode), the first switch SW1 and the second switch SW2 are opened, and the third switch SW3 is closed. This path electrically separates the first system in which an abnormality has occurred due to a power failure from the second system, forming a backup power supply configuration in which power is supplied from the second battery 12 to the second load 22 of the secondary system.

[0049] The backup power supply configuration shown in the third state prevents the influence of an abnormality caused by a power failure in the primary system from spreading to the secondary system, and allows the second battery 12 to continue supplying power to the second load 22 in the secondary system. Therefore, the necessary vehicle functions that would have been lost due to the failure of the first load 21 can be maintained by the continued operation of the second load 22.

[0050] When the control unit 145 controls the connection states of the first battery 11, the second battery 12, the first load 21, and the second load 22 to the third state (backup mode), the process proceeds to step S210.

[0051] (Step S210) The control unit 145 determines whether or not the backup is completed by supplying power from the second battery 12 to the second load 22. Completion of the backup typically refers to the completion of control of the necessary vehicle functions that should be performed when an abnormality occurs in the primary system, and can be exemplified by continuing the power supply to the second load 22 until the completion of an evacuation action to pull the autonomously driven vehicle over to the shoulder of the road or the like in an emergency and stop it.

[0052] If control unit 145 determines that the backup is complete (Yes in step S210), the process proceeds to step S211; if control unit 145 determines that the backup is not complete (No in step S210), the process waits until the backup is complete.

[0053] (Step S211) The control unit 145 controls the connection state of the first battery 11, the second battery 12, the first load 21, and the second load 22 to a second state (pass mode) in which power is supplied from the first battery 11 to the first load 21 and the second battery 12.

[0054] Fig. 4 is a diagram showing a power supply path of the power supply system 10 in the second state (pass mode). As shown in Fig. 4, in the second state (pass mode), the first switch SW1 is closed, and the second switch SW2 and the third switch SW3 are opened. This path forms a power supply configuration in which power is supplied from the first battery 11 to the first load 21 of the primary system and the second load 22 of the secondary system, and the second battery 12 is isolated from the secondary system.

[0055] In the power supply configuration shown in the second state, the second battery 12 is separated from the secondary system, so it is possible to avoid power consumption from the second battery 12 to the second load 22, and to suppress the progression of deterioration of the second battery 12. In addition, it is possible to extend the life of the second battery 12, so that the frequency of battery replacement is reduced, and the burden on the user and the environment can be reduced.

[0056] When the control unit 145 controls the connection states of the first battery 11, the second battery 12, the first load 21, and the second load 22 to the second state (pass mode), the process returns to step S201.

[0057] <Actions and Effects> As described above, the power supply control device 14 according to an embodiment of the present disclosure performs diagnosis of the second battery 12 when the power supply state of the vehicle switches from off (IG-OFF) to on (IG-ON). If the result of the diagnosis indicates that the second battery 12 is normal and a redundant power supply configuration is possible, the power supply control device 14 controls the first switch SW1, the second switch SW2, and the third switch SW3 to a first state (redundancy mode) in which power can be supplied from the first battery 11 to the first load 21 and the second battery 12 and power can be supplied from the second battery 12 to the second load 22.

[0058] With this control, when the second battery 12 is in a state where it can be used as a redundant power source, the power source of the vehicle can be in a redundant configuration while the power state of the vehicle is from on (IG-ON) to off (IG-OFF) even when a redundant power source configuration is not required, such as in autonomous driving. Therefore, the vehicle can be expanded to a state where it can back up the necessary functions of the first load 21 at any time.

[0059] Furthermore, in the power supply control device 14 according to an embodiment of the present disclosure, when the power supply state of the vehicle switches from on (IG-ON) to off (IG-OFF), for example, a diagnosis is performed on the first battery 11. If the result of the diagnosis indicates that the first battery 11 is in a normal state and the redundant power supply configuration can be released, the first switch SW1, the second switch SW2, and the third switch SW3 are controlled to a second state (pass mode) in which power is only supplied from the first battery 11 to the first load 21 and the second battery 12.

[0060] By this control, in a situation where the redundant power supply configuration is considered unnecessary, such as when the vehicle is parked, it is possible to electrically disconnect the second battery 12 from the power supply configuration of the vehicle after confirming that the first battery 11 is normal. Therefore, it is possible to prevent the number of charging and discharging of the second battery 12 from increasing unnecessarily, and to suppress the progression of deterioration of the second battery 12. In addition, since it is possible to suppress the discharge of the second battery 12 when the vehicle power supply is turned off, it is possible to shorten the charging time of the power required to start traveling the next time the vehicle power supply is turned on. Furthermore, since the switching to the second state (pass mode) is controlled after the diagnosis of the first battery 11 is performed, it is possible to avoid the redundant power supply configuration being released immediately when the vehicle power supply state is turned off (IG-OFF).

[0061] The above describes one embodiment of the disclosed technology, but the present disclosure can be understood as not only a power supply control device, but also a control method executed by a power supply control device having a processor and a memory, a control program for the control method, a computer-readable non-transitory recording medium storing the control program, or a vehicle equipped with a power supply control device. [Industrial Applicability]

[0062] The power supply control device and the like disclosed herein can be used in vehicles equipped with multiple redundant batteries. [Explanation of symbols]

[0063] 10 Power System 11 Battery No. 1 12 Second Battery 13 DC-DC converter 14 Power supply control device 141 Acquisition Department 142 Diagnostic Department 143 Detection unit 144 Judgment Department 145 Control Unit 21 1st load 22 2nd load SW1 First switch SW2 Second switch SW3 3rd switch

Claims

1. A power supply control device that controls power supply to a load of a vehicle using a first battery and a second battery, An acquisition unit that acquires a power supply state of the vehicle; a diagnosis unit that performs diagnosis of the second battery when a power supply state of the vehicle is switched from off to on; a control unit that controls an electrical connection state between the load, the first battery, and the second battery, The control unit is When the diagnosis unit diagnoses that the second battery is normal, control is performed to a first state in which power can be supplied from the first battery to the load and the second battery and power can be supplied from the second battery to the load; When the vehicle satisfies a predetermined condition after a power supply state of the vehicle is switched from on to off, control is performed to a second state in which the first battery can supply power to the load and the second battery is electrically disconnected from the first battery and the load. Power control device.

2. the diagnosis unit performs a diagnosis of the first battery when a power supply state of the vehicle is switched from on to off; The control unit controls the first battery, the second battery, and the load to the second state when the diagnosis unit diagnoses that the first battery is normal, which is the predetermined condition. The power supply control device according to claim 1 .

3. the diagnosing unit diagnoses that the first battery is normal when a voltage of the first battery is equal to or higher than a predetermined threshold for a first period of time after a power supply state of the vehicle is switched from on to off; The power supply control device according to claim 2.

4. A detection unit for detecting a speed of the vehicle is further provided. the control unit controls the first battery, the second battery, and the load to the second state when the speed of the vehicle is equal to or lower than a predetermined speed for a second period of time after the power state of the vehicle is switched from on to off, which is the predetermined condition. The power supply control device according to claim 1 .

5. A determination unit for determining a parking lock state of the vehicle is further provided, When the determination unit determines that the parking lock, which is the predetermined condition, has been completed after a power supply state of the vehicle is switched from on to off, the control unit controls the first battery, the second battery, and the load to the second state. The power supply control device according to claim 1 .

6. the load includes an electric brake actuator having a disc brake pad and a brake rotor; The completion of the parking lock is a state in which the disc brake pad is pressed against the brake rotor. The power supply control device according to claim 5.

7. A control method executed by a power supply control device that controls power supply to a load of a vehicle using a first battery and a second battery, comprising: obtaining a power status of the vehicle; performing a diagnosis of the second battery when a power state of the vehicle is switched from off to on; When the second battery is diagnosed as normal, controlling to a first state in which power can be supplied from the first battery to the load and the second battery and power can be supplied from the second battery to the load; and when the vehicle satisfies a predetermined condition after a power supply state of the vehicle is switched from on to off, controlling the vehicle to a second state in which power supply from the first battery to the load is possible and the second battery is electrically disconnected from the first battery and the load. Control methods.

8. A control program to be executed by a computer of a power supply control device that controls power supply to a load of a vehicle using a first battery and a second battery, obtaining a power status of the vehicle; performing a diagnosis of the second battery when a power state of the vehicle is switched from off to on; When the second battery is diagnosed as normal, controlling to a first state in which power can be supplied from the first battery to the load and the second battery and power can be supplied from the second battery to the load; and when the vehicle satisfies a predetermined condition after a power supply state of the vehicle is switched from on to off, controlling the vehicle to a second state in which power supply from the first battery to the load is possible and the second battery is electrically disconnected from the first battery and the load. Control program.

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