Solar Charging System

Abstract

To provide a solar charging system capable of inhibiting charging to a driving battery from being immediately suspended immediately after activation, causing insufficient charging.SOLUTION: A solar charging system 100 is provided in a vehicle on which a drive system 30 and an auxiliary system 20 configured to include one or more auxiliaries are mounted. The solar charging system 100 comprises a solar panel 110 and a control unit 120. The control unit 120 stops power supply to the auxiliary system 20 and charging to a driving battery 31 when both of a state in which charge power to the driving battery 31 is lower than a first threshold value and a state in which supply power to the auxiliary system 20 is lower than an average value of supply power during the previous charging to the driving battery 31 are established.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a solar charging system mounted on a vehicle. [Background technology]

[0002] Patent Document 1 discloses a solar charging system mounted on a vehicle. This solar power generation system includes a solar panel, a drive battery, an auxiliary system, and a control unit. The auxiliary system includes one or more auxiliary devices. The control unit controls the destination of the supply of power generated by the solar panel.

[0003] The solar charging system disclosed in Patent Document 1 supplies power to an auxiliary system when a solar panel is generating power. When the power generated by the solar panel is equal to or greater than a first power, charging of the drive battery begins. When the power generated by the solar panel falls below a second power, the solar charging system disclosed in Patent Document 1 stops charging of the drive battery. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-83248 Summary of the Invention [Problem to be solved by the invention]

[0005] When the solar charging system is started, various devices in the auxiliary system are started. Therefore, immediately after the solar charging system is started, the power consumption in the auxiliary system is high. If the power consumption in the auxiliary system is high, most of the power generated by the solar panel will be consumed by the auxiliary system. Therefore, the above solar charging system may stop charging the drive battery immediately after start-up, resulting in insufficient charging. [Means for solving the problem]

[0006] The means for solving the above problems and their effects will be described below. A solar charging system for solving the above problems is mounted on a vehicle equipped with a drive system that drives the vehicle using power stored in a drive battery and an auxiliary system including one or more auxiliary devices. The solar charging system includes a solar panel and a control unit. When power is supplied to the auxiliary system and the drive battery is being charged, the control unit stops power supply to the auxiliary system and charging of the drive battery if both of the following conditions are met: the charging power to the drive battery is less than a first threshold value, and the power supplied to the auxiliary system is less than the average value of the power supplied to the auxiliary system during the previous charging of the drive battery. [Effects of the Invention]

[0007] This solar charging system can prevent the drive battery from being insufficiently charged due to charging stopping immediately after startup. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a solar charging system according to an embodiment. [Figure 2] FIG. 2 is an explanatory diagram illustrating how power is supplied to the auxiliary system and how the drive battery is charged in the solar charging system of the embodiment. [Figure 3] FIG. 3 is a time chart showing the transition of the command value for the power supply to the auxiliary system. [Figure 4] FIG. 4 is a flowchart showing the flow of a series of processes executed by the control unit of the solar charging system. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of a solar charging system will be described below with reference to FIGS. <Configuration of solar charging system 100> As shown in Fig. 1, the solar charging system 100 includes a solar panel 110 and a control unit 120. The solar panel 110 is configured as a panel with a plurality of solar cells that generate electricity when exposed to sunlight. The solar charging system 100 is mounted on a vehicle that includes a drive system 30 that drives the vehicle using power stored in a drive battery 31, and an auxiliary system 20 that includes one or more auxiliary devices.

[0010] The solar panel 110 is installed, for example, on the roof of the vehicle. The solar panel 110 may also be installed on the hood of the vehicle. The vehicle's auxiliary system 20 includes an auxiliary battery 21. The auxiliary system 20 includes a plurality of auxiliary devices and a plurality of control devices that operate using power from the auxiliary battery 21 and power generated by a solar panel 110. The plurality of auxiliary devices are, for example, an electric oil pump, a navigation system, lamps, and various sensors. The plurality of control devices are, for example, control devices that control each auxiliary device, a control device for a driving assistance system, and a control device for an authentication system. The vehicle's drive system 30 includes one or more motors for driving the vehicle. The vehicle's drive system 30 includes a drive battery 31 that supplies power to the motors.

[0011] The auxiliary battery 21 is charged with electricity generated by the solar panel 110. The auxiliary battery 21 is, for example, a nickel-metal hydride battery. The auxiliary battery 21 is not limited to a nickel-metal hydride battery and may be another type of battery. The driving battery 31 is a lithium-ion battery. The driving battery 31 is not limited to a lithium-ion battery and may be another type of battery.

[0012] <Configuration of control unit 120> 1, the solar panel 110 is connected to a control unit 120. The auxiliary system 20 and the drive system 30 are also connected to the control unit 120. The control unit 120 includes a first DC-DC converter 121, a second DC-DC converter 122, a third DC-DC converter 123, and a control device 124.

[0013] The first DC-DC converter 121 converts the electric power generated by the solar panel 110. The second DC-DC converter 122 converts the electric power converted by the first DC-DC converter 121 and supplies it to the auxiliary system 20. The third DC-DC converter 123 converts the electric power converted by the first DC-DC converter 121 and supplies it to the drive system 30.

[0014] The control device 124 controls the first DC-DC converter 121, the second DC-DC converter 122, and the third DC-DC converter 123. The control unit 120 is connected to the vehicle control unit 10. The vehicle control unit 10 includes a vehicle control device 11. The control unit 120 and the vehicle control unit 10 are connected to each other so that they can communicate with each other. The vehicle control unit 10 controls the auxiliary system 20 and the drive system 30.

[0015] The vehicle control device 11 acquires the input current to and output current from the auxiliary battery 21 in the auxiliary system 20. The vehicle control device 11 calculates the power consumption in the auxiliary system 20 based on the acquired input current or output current, the voltage of the auxiliary battery 21, and the power supplied from the solar panel 110. The vehicle control device 11 calculates the power storage rate of the auxiliary battery 21. The vehicle control device 11 acquires the input current to and output current from the drive battery 31 in the drive system 30. The vehicle control device 11 calculates the power consumption in the drive system 30 based on the acquired input current or output current and the voltage of the drive battery 31. The vehicle control device 11 calculates the power storage rate of the drive battery 31.

[0016] The vehicle control unit 10 sets a target value for the power storage rate of the auxiliary battery 21. Then, the vehicle control unit 10 calculates a command value for the supply power Waux to maintain the power storage rate at a target level within a certain range including the target value, and transmits the command value to the control unit 120. The control unit 120 measures the current and voltage of the power input to the first DC-DC converter 121 to calculate the power generation power Wgen of the solar panel 110.

[0017] 2, the generated power Wgen is power generated by the solar panel 110. The supplied power Waux is power converted by the second DC-DC converter 122 and supplied to the auxiliary system 20. The control unit 120 receives a command value from the vehicle control unit 10 and controls the second DC-DC converter 122 based on the command value to control the power supplied to the auxiliary system 20 so as to realize the supplied power Waux according to the command value.

[0018] The control unit 120 calculates the difference by subtracting the supply power Waux from the generated power Wgen. The control unit 120 uses the calculated difference as the charging power Wchg to the drive battery 31. As shown in FIG. 2, the charging power Wchg is power converted by the third DCDC converter 123 and charged to the drive battery 31. The control unit 120 controls the third DCDC converter 123 to realize the charging power Wchg, thereby charging the drive battery 31.

[0019] 2, the solar charging system 100 divides the generated power Wgen generated by the solar panel 110 into supply power Waux and charging power Wchg and supplies them to the auxiliary system 20 and the drive system 30. As described above, the charging power Wchg supplied to the drive battery 31 is the remaining power after subtracting the supply power Waux supplied to the auxiliary system 20 from the generated power Wgen.

[0020] <Changes in the command value for power supply Waux> FIG. 3 shows the transition of the command value of the power supply Waux to the auxiliary system 20. Time t_0 in FIG. 3 indicates the time when the control unit 120 is started up. When the control unit 120 is started up, the control devices 124 and the other control devices mounted on the vehicle are all started up at the same time. Then, each started control device diagnoses whether it is necessary to continue operating. A control device that is diagnosed as not needing to continue operating transitions to a sleep state. In this way, control devices that are not involved in the control of the solar charging system 100 transition to a sleep state. Then, control devices involved in the control of the solar charging system 100 continue to operate. Examples of the control devices involved in the control of the solar charging system 100 include the control device 124 of the control unit 120 and the vehicle control device 11 of the vehicle control unit 10. As such, immediately after the control unit 120 is started up, many control devices are started up at the same time, resulting in a large amount of power consumption by the auxiliary system 20.

[0021] When the control unit 120 transitions to the sleep state, all of the control devices mounted on the vehicle are simultaneously started up, just as when they are started up. Each of the started control devices then diagnoses whether it is necessary to continue operating. A control device that is diagnosed as not needing to continue operating transitions to the sleep state. Therefore, even when the control unit 120 transitions to the sleep state, the power consumption of the auxiliary system 20 increases. The control unit 120 transitions to the sleep state when the solar panel 110 is no longer able to generate sufficient power. At this time, power from the auxiliary battery 21 is consumed. Therefore, the auxiliary battery 21 needs to be charged in advance with the power that will be consumed at this time.

[0022] 3, for a certain period after the control unit 120 is started, the vehicle control unit 10 sets the command value of the supply power Waux to a large value in order to cover the large power consumption and charge the auxiliary battery 21. The period during which the command value of the supply power Waux is set to a large value after the control unit 120 is started is referred to as a post-startup charging period.

[0023] Then, vehicle control unit 10 reduces the command value for supply power Waux when control devices that do not need to continue operating transition to a sleep state to reduce power consumption and when charging of auxiliary battery 21 is completed. As shown in Fig. 3, vehicle control unit 10 gradually reduces the command value for supply power Waux as charging of auxiliary battery 21 approaches completion, thereby ending the post-startup charging period.

[0024] After the post-startup charging period ends, the vehicle control unit 10 calculates the command value for the supplied power Waux so as to maintain the charging rate of the auxiliary battery 21 at the target level, as described above. As described above, the power Waux supplied to the auxiliary system 20 is large during the post-startup charging period immediately after startup of the solar charging system 100. As a result, most of the power Wgen generated by the solar panel 110 is consumed by the auxiliary system 20. In the solar charging system 100, it is possible to require that the charging power Wchg to the drive battery 31 be equal to or greater than a certain level as a condition for continuing charging. However, in this case, there is a risk that charging of the drive battery 31 will stop immediately after startup, resulting in insufficient charging.

[0025] Therefore, the solar charging system 100 sets the condition for stopping charging as being that both the charging power Wchg is less than the first threshold value Wx and the supply power Waux is less than the average value Waux_old of the supply power Waux.

[0026] <Routines executed by the control unit 120> Next, a routine executed by the control unit 120 will be described with reference to Fig. 4. The routine shown in Fig. 4 is executed by the control device 124 every time the control unit 120 is started. After the control unit 120 transitions to a sleep state, it is started every time the duration of the sleep state reaches a certain time. When this routine is started, first, in the processing of step S100, the control device 124 calculates the estimated generated power West. The estimated generated power West is an estimated value of the generated power Wgen generated by the solar panel 110. The control device 124 calculates the estimated generated power West based on, for example, the closed circuit voltage and outflow current of the solar panel 110.

[0027] In the next step S110, the control device 124 determines whether the difference obtained by subtracting the average value Waux_old from the estimated power generation West is equal to or greater than a second threshold value Wy. The average value Waux_old is the average value of power consumed by the auxiliary system 20 during the previous charging of the drive battery 31. The average value Waux_old is calculated in the processing of step S180, which will be described later. The second threshold value Wy is a threshold value used to determine whether the solar panel 110 is capable of generating enough power to charge the drive battery 31. The magnitude of the second threshold value Wy is set in advance so that it can be determined that the drive battery 31 can be charged based on whether the difference is equal to or greater than the second threshold value Wy.

[0028] In the process of step S110, if the control device 124 determines that the difference is less than the second threshold value Wy (step S110: NO), the process proceeds to step S190. In this case, the control device 124 causes the control unit 120 to transition to a sleep state without supplying power to the auxiliary system 20 or charging the drive battery 31. Then, the control device 124 ends this routine.

[0029] In the process of step S110, if the control device 124 determines that the difference is equal to or greater than the second threshold value Wy (step S110: YES), the process proceeds to step S120.

[0030] In the processing of step S120, the control device 124 starts power supply to the auxiliary system 20 and charging of the drive battery 31. Specifically, the control device 124 controls the first DC-DC converter 121 and the second DC-DC converter 122 to start power supply to the auxiliary system 20. The control device 124 controls the power supply to the auxiliary system 20 based on a command value received from the vehicle control unit 10. As described above, the control device 124 controls the second DC-DC converter 122 in accordance with the command value so as to realize the supply power Waux in accordance with the command value.

[0031] The control device 124 controls the third DCDC converter 123 to charge the drive battery 31. As described above, the control device 124 controls the third DCDC converter 123 to supply the drive battery 31 with the remaining power obtained by subtracting the supply power Waux supplied to the auxiliary system 20 from the generated power Wgen.

[0032] In the next step S130, the control device 124 determines whether the charging power Wchg is less than a first threshold value Wx. The first threshold value Wx is a threshold value for determining whether charging power Wchg at a certain level or higher can no longer be secured. The magnitude of the first threshold value Wx is set in advance so that it can be determined that charging power Wchg at a certain level or higher can no longer be secured based on the fact that the generated power Wgen is less than the first threshold value Wx. For example, the first threshold value Wx is a value smaller than the second threshold value Wy.

[0033] In the process of step S130, if the control device 124 determines that the charging power Wchg is equal to or greater than the first threshold value Wx (step S130: NO), the process proceeds to step S170.

[0034] In the process of step S170, the control device 124 determines whether or not a first time Tx has elapsed since charging of the driving battery 31 started. The period from time t_0 to time t_1 in Fig. 3 corresponds to the first time Tx. As shown in Fig. 3, the length of the first time Tx is set to a length that allows determination that the post-start charging period, in which the command value of the supply power Waux is set to a large value, has ended when the elapsed time from the start of charging is equal to or longer than the first time Tx.

[0035] In the process of step S170, if the control device 124 determines that the first time Tx has not elapsed since the start of charging the driving battery 31 (step S170: NO), the process returns to step S130. In this case, the control device 124 executes the processes from step S130 onwards again.

[0036] In the process of step S170, if control device 124 determines that first time Tx has elapsed since the start of charging of driving battery 31 (step S170: YES), the process proceeds to step S180.

[0037] In the process of step S180, the control device 124 updates the average value Waux_old. Specifically, the control device 124 calculates and updates the average value Waux_old based on the supplied power Waux acquired after the elapsed time from the start of charging becomes equal to or greater than the first time Tx. After updating the average value Waux_old, the process returns to step S130. In this case, the control device 124 executes the processes from step S130 onwards again.

[0038] In the process of step S130, if the control device 124 determines that the charging power Wchg is less than the first threshold value Wx (step S130: YES), the process proceeds to step S140.

[0039] In the process of step S140, the control device 124 determines whether the supply power Waux is less than the average value Waux_old. In the process of step S140, the average value Waux_old is used as a value indicating the level of power consumption in the auxiliary system 20 in normal times when the post-startup charging period is not in progress. That is, the process of step S140 is a process for determining a state in which the supply power Waux that exceeds the power consumption in the auxiliary system 20 in normal times cannot be supplied, in other words, a state in which there is no power to allocate to charging the drive battery 31.

[0040] The supply power Waux used in the processing of step S140 is obtained by the control unit 120 receiving the value of the power supplied to the auxiliary system 20 from the vehicle control unit 10. That is, the supply power Waux used in the processing of step S140 is an actual measured value of the power supplied to the auxiliary system 20. The supply power Waux used in the processing of step S140 may also be a target value used by the control unit 120 to control the supply power Waux.

[0041] In the process of step S140, if the control device 124 determines that the supplied power Waux is equal to or greater than the average value Waux_old (step S140: NO), the process proceeds to step S170. In this case, the control device 124 executes the processes from step S170 onwards.

[0042] In the process of step S140, if the control device 124 determines that the supplied power Waux is less than the average value Waux_old (step S140: YES), the process proceeds to step S150.

[0043] In the process of step S150, the control device 124 stops power supply to the auxiliary system 20 and charging of the drive battery 31. In the process of the next step S160, the control device 124 waits until a second time Ty has elapsed. The second time Ty is, for example, several minutes. When the second time Ty has elapsed, the process returns to step S100. Then, the control device 124 executes the processes from step S100 onwards again.

[0044] In this way, the solar charging system 100 sets the condition for stopping charging as being that both the charging power Wchg is less than the first threshold value Wx and the supply power Waux is less than the average value Waux_old of the supply power Waux.

[0045] <Operation of this embodiment> The control unit 120 stops charging the driving battery 31 when both the charging power Wchg is less than the first threshold value Wx and the supply power Waux is less than the average value Waux_old.

[0046] If the power Waux supplied to the auxiliary system 20 is less than the average value Waux_old, it is highly likely that the power consumption cannot be covered by the power Waux supplied from the solar charging system 100 alone. In other words, it is highly likely that at this time, the electricity generated by the solar panel 110 cannot be allocated to charging the drive battery 31.

[0047] The condition for determining that the charging power Wchg to the drive battery 31 is less than the first threshold value Wx is that a certain level of charging power Wchg or more cannot be secured. On the other hand, the condition for determining that the power Waux supplied to the auxiliary system 20 is less than the average value Waux_old is that there is a high probability that the electricity generated by the solar panel 110 cannot be allocated to charging the drive battery 31.

[0048] Even if this solar charging system 100 determines that a certain level of charging power Wchg or more can no longer be secured, it does not stop charging solely because of that fact. This solar charging system 100 continues charging until it becomes highly likely that the electricity generated by the solar panel 110 cannot be allocated to charging the drive battery 31. Therefore, this solar charging system 100 is more likely to continue charging than solar charging systems that stop charging only because the charging power Wchg to the drive battery 31 is less than the first threshold Wx.

[0049] <Effects of this embodiment> (1) This solar charging system 100 is likely to continue charging even when the power consumption of the auxiliary system 20 is high immediately after startup. Therefore, this solar charging system 100 can prevent the charging of the drive battery 31 from being stopped immediately after startup, resulting in insufficient charging.

[0050] (2) The processes of steps S100 to S120 and step S190 are start determinations. When the control unit 120 is started up, it executes the start determination. In the start determination, the control unit 120 calculates the estimated generated power West. In the start determination, the control unit 120 starts power supply to the auxiliary system 20 and charging of the drive battery 31 if the difference obtained by subtracting the average value Waux_old from the estimated generated power West is equal to or greater than the second threshold value Wy. In the start determination, if the difference is less than the second threshold value Wy, the control unit 120 transitions to a sleep state.

[0051] The fact that the difference between the average value Waux_old and the estimated power generation West is greater than or equal to the second threshold value Wy indicates that the power consumption of the auxiliary system 20 is covered and power greater than or equal to the second threshold value Wy can be allocated to charging the drive battery 31.

[0052] This solar charging system 100 transitions to a sleep state when it is unable to allocate power equal to or greater than the second threshold Wy to charging the drive battery 31. In other words, this solar charging system 100 transitions to a sleep state to reduce power consumption when it is unable to allocate a certain amount of power to the drive battery 31. This solar charging system 100 transitions to a sleep state when efficient charging is not possible, thereby reducing power consumption.

[0053] (3) If charging of the drive battery 31 is stopped when the power supply Waux to the auxiliary system 20 is large immediately after startup, the average value Waux_old becomes relatively large. If such a large average value Waux_old is used for the start determination, it becomes difficult to start power supply to the auxiliary system 20 and charging of the drive battery 31.

[0054] The solar charging system 100 does not calculate or update the average value Waux_old when the elapsed time from the start of charging of the drive battery 31 is less than the first time Tx. The solar charging system 100 calculates and updates the average value Waux_old based on the supplied power Waux acquired after the elapsed time becomes equal to or greater than the first time Tx. This makes it possible to prevent the average value Waux_old from becoming too large, making it difficult to start supplying power to the auxiliary system 20 and charging the drive battery 31.

[0055] (4) The power generation Wgen of the solar panel 110 varies depending on the amount of solar radiation. Therefore, even if the amount of solar radiation temporarily decreases and charging stops, the amount of solar radiation may recover soon thereafter, making it possible to charge again.

[0056] After the solar charging system 100 stops the power supply to the auxiliary system 20 and the charging of the drive battery 31, it executes the start determination again when the second time Ty has elapsed. That is, even if the charging is stopped, the solar charging system 100 does not transition to a sleep state but executes the start determination again. Therefore, even if charging is once stopped, if the state where charging is possible is restored within the second time Ty, charging can be resumed promptly.

[0057] The solar charging system 100 can suppress repetition of transition to a sleep state and startup from the sleep state. Therefore, the solar charging system 100 can suppress power consumption due to transition to a sleep state and power consumption due to startup from the sleep state.

[0058] (6) In the solar charging system 100, the control unit 120 controls the supply power Waux based on the command value in order to maintain the power storage rate of the auxiliary battery 21 at a target level, which is calculated by the vehicle control unit 10. Therefore, the solar charging system 100 can control the supply power Waux in order to maintain the power storage rate of the auxiliary battery 21 at the target level.

[0059] (7) The power consumption by the auxiliary system 20 varies depending on the number and type of options installed in the vehicle. The power consumption by the auxiliary system 20 also varies depending on how the user uses the vehicle. For example, if a user makes heavy use of the air conditioner, the power consumption by the auxiliary system 20 will be high. The power consumption by the auxiliary system 20 also gradually changes due to deterioration over time. In the solar charging system 100, the average value Waux_old is used as an index value for the power consumption in the auxiliary system 20 under normal conditions in the processes of steps S110 and S140. The solar charging system 100 performs the processes of steps S110 and S140 using the latest average value Waux_old, which is closest to the actual power consumption under normal conditions. Therefore, the solar charging system 100 can make accurate determinations that correspond to changes in power consumption under normal conditions due to the number and type of options on the vehicle, how the user uses the vehicle, deterioration over time, etc.

[0060] <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0061] The solar charging system 100 may include a plurality of solar panels 110. In this case, the control unit 120 is provided with a plurality of DC-DC converters similar to the first DC-DC converter 121 so as to correspond to the plurality of solar panels 110, respectively.

[0062] The control device 124 and the vehicle control device 11 may be configured as a circuit including one or more processors that execute various processes according to a computer program (software). The control device 124 and the vehicle control device 11 may also be configured as a circuit including one or more dedicated hardware circuits, such as an application specific integrated circuit (ASIC), that execute at least some of the various processes, or a combination thereof. The processor includes a CPU and memory such as RAM and ROM. The memory stores program code or instructions configured to cause the CPU to execute processes. The memory, i.e., computer-readable medium, includes any available medium that can be accessed by a general-purpose or special-purpose computer. [Explanation of symbols]

[0063] 10...Vehicle control unit 11...Vehicle control device 20...Auxiliary system 21...Auxiliary battery 30...Drive system 31...Drive battery 100...Solar charging system 110...Solar panel 120...Control unit 121...1st DC / DC converter 122...Second DC / DC converter 123...Third DC / DC converter 124...Control device

Claims

1. A solar charging system is mounted on a vehicle that is equipped with a drive system that drives the vehicle using power stored in a drive battery and an auxiliary system that includes one or more auxiliary devices, A solar panel and a control unit are provided. When power is supplied to the auxiliary system and the drive battery is being charged, the charging power to the driving battery is less than a first threshold; and the power supplied to the auxiliary system is less than the average value of the power supplied during the previous charging of the drive battery. The control unit stops power supply to the auxiliary system and charging of the drive battery. Solar charging system.

2. The control unit Upon startup, the system calculates an estimated generated power, which is an estimated value of the power generated by the solar panel, and if the difference obtained by subtracting the average value of the power supplied to the auxiliary system during the previous charging of the drive battery from the estimated generated power is equal to or greater than a second threshold, starts power supply to the auxiliary system and charging of the drive battery, and if the difference is less than the second threshold, executes a start determination to transition to a sleep state. The solar charging system according to claim 1 .

3. The control unit does not calculate and update the average value when the elapsed time from the start of power supply to the auxiliary system and charging of the drive battery is less than a first hour, and calculates and updates the average value based on the supplied power after the elapsed time becomes the first hour or more. The solar charging system according to claim 2 .

4. The control unit performs the start determination again when a second time has elapsed after stopping the power supply to the auxiliary system and the charging of the drive battery. The solar charging system according to claim 2 .

5. the vehicle includes a vehicle control unit that controls the auxiliary system and the drive system, the auxiliary system including an auxiliary battery, the vehicle control unit calculates a power storage rate of the auxiliary battery and calculates a command value for the supplied power to maintain the power storage rate at a target level; The control unit controls the supplied power based on the command value calculated by the vehicle control unit. The solar charging system according to claim 1 .

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