JP2019013074A - Vehicular solar battery control device, control method for vehicular solar battery control device, and vehicular solar battery system - Google Patents

Abstract

To efficiently use power generated by a solar battery installed in a vehicle.SOLUTION: A vehicular solar battery control device controls the output of a solar battery installed in a vehicle. The vehicular solar battery control device includes a control unit that can perform MPPT control of the output of the solar battery. The control unit determines whether MPPT control of the output of the solar battery is necessary or not on the basis of the amount of solar radiation incident on the solar battery.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a vehicle solar cell control device, a vehicle solar cell control device control method, and a vehicle solar cell system.

  Conventionally, a technique has been proposed in which a solar cell is mounted on a vehicle and the vehicle battery is charged with the generated power of the solar cell (for example, Patent Document 1).

JP 2013-74733 A

  There is room for improvement in technology that efficiently uses the power generated by solar cells mounted on vehicles.

  An object of the present disclosure is to provide a vehicle solar cell control device, a vehicle solar cell control device control method, and a vehicle solar cell system that can efficiently use the generated power of a solar cell mounted on a vehicle. There is.

  A vehicle solar cell control device according to an embodiment of the present disclosure controls the output of a solar cell mounted on a vehicle. The vehicle solar cell control device includes a control unit capable of MPPT-controlling the output of the solar cell. The said control part determines the necessity of MPPT control with respect to the output of the said solar cell based on the solar radiation amount irradiated to the said solar cell.

  A control method for a vehicle solar cell control device according to an embodiment of the present disclosure controls the output of a solar cell mounted on a vehicle. The control method includes a step of determining whether or not MPPT control is required for the output of the solar cell based on the amount of solar radiation applied to the solar cell.

  A vehicle solar cell system according to an embodiment of the present disclosure includes a solar cell mounted on a vehicle and a control device that controls an output of the solar cell. The said control apparatus is provided with the control part which can carry out MPPT control of the output of the said solar cell. The said control part determines the necessity of MPPT control with respect to the output of the said solar cell based on the solar radiation amount irradiated to the said solar cell.

  According to the vehicle solar cell control device, the vehicle solar cell control device control method, and the vehicle solar cell system according to an embodiment of the present disclosure, the generated power of the solar cell mounted on the vehicle is efficiently used. be able to.

It is a figure showing a schematic structure of a solar cell system for vehicles including a control device concerning one embodiment of this indication. It is the schematic which shows a mode that the solar cell is installed in the roof part of the vehicle. It is a figure which shows schematic structure of the DC / DC converter of FIG. It is a figure which shows the example of IV curve of the solar cell string of FIG. 5 is a flowchart illustrating an example of an operation of a control device according to an embodiment of the present disclosure.

  Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

  A vehicle solar cell system 1 shown in FIG. 1 includes a solar cell 10, a control device 20, and a battery 30. In FIG. 1, a solid line connecting each functional block mainly indicates a power line, and a broken line mainly indicates a communication line or a signal line.

  Solar cell 10 is a solar cell mounted on a vehicle. The solar cell 10 is installed on the exterior of the vehicle. Since the solar cell 10 receives much solar radiation, it is installed, for example in the roof part of a vehicle. FIG. 2 is a schematic view showing a state in which the solar cell 10 is installed on the roof portion of the vehicle. The installation location of the solar cell 10 is not limited to the roof portion of the vehicle. The solar cell 10 may be installed in a bonnet part, a rear part, a side part, etc., for example. Moreover, the solar cell 10 may be installed in several places of a vehicle, for example, a roof part and a bonnet part. The solar cell 10 supplies the generated DC power to the control device 20.

  The control device 20 controls the output of the solar cell 10 that is a vehicle solar cell. The control device 20 converts the DC power supplied from the solar cell 10 into DC power having a predetermined voltage and supplies it to the battery 30.

  The battery 30 is charged with DC power supplied from the control device 20. In the present embodiment, the generated power of the solar cell 10 is used for charging the battery 30, but the usage destination of the generated power is not limited to this. For example, when the vehicle on which the solar cell 10 is mounted is a hybrid vehicle or an electric vehicle, the generated power of the solar cell 10 may be supplied to a power motor. Moreover, the electric power generated by the solar cell 10 may be supplied to an electric compressor of an air conditioner of the vehicle, for example.

  The solar cell 10 includes a plurality of solar cell strings 11-1 to 11 -N connected in parallel to the control device 20. The number N of the solar cell strings 11 may be an arbitrary number.

  The solar cell string 11 includes a plurality of solar cell modules 12 connected in series. The solar cell module 12 is a package in which a plurality of solar cells are arranged.

  The control device 20 includes a control unit 21, a storage unit 22, DC / DC converters 23-1 to 23 -N, a battery control unit 24, a voltage sensor 25, and a communication unit 26.

  The control unit 21 controls each component of the control device 20. The control unit 21 is configured as a processor, for example. The control unit 21 may include one or more processors. The processor may include a general-purpose processor that reads a specific program and executes a specific function, and a dedicated processor specialized for a specific process. The dedicated processor may include an application specific integrated circuit (IC). The application specific IC is also called ASIC (Application Specific Integrated Circuit). The processor may include a programmable logic device. The programmable logic device is also called a PLD (Programmable Logic Device). The PLD may include an FPGA (Field-Programmable Gate Array). The control unit 21 may be one of SoC (System-on-a-Chip) and SiP (System in a Package) in which one or a plurality of processors cooperate. Details of the control performed by the control unit 21 will be described later.

  The storage unit 22 stores information acquired from the control unit 21. The storage unit 22 stores a program executed by the control unit 21. The storage unit 22 stores various data such as the calculation result by the control unit 21, for example. The storage unit 22 may function as a work memory for the control unit 21. The storage unit 22 may be configured by a semiconductor memory, a magnetic memory, or the like, for example. The storage unit 22 may be configured integrally with the control unit 21.

  The DC / DC converter 23 is connected to the solar cell string 11 and supplied with DC power from the solar cell string 11. As shown in FIG. 1, one DC / DC converter 23 is connected to one solar cell string 11.

  The control unit 21 controls the output of the solar cell string 11 using the DC / DC converter 23. When the output of the solar cell string 11 is subjected to MPPT (Maximum Power Point Tracking) control, the control unit 21 turns on the switching of the transistor 232 (see FIG. 3) in the DC / DC converter 23. When the control unit 21 performs fixed voltage control on the output of the solar cell string 11, the control unit 21 turns off the switching of the transistor 232 in the DC / DC converter 23.

  When the control unit 21 performs MPPT control on the output of the solar cell string 11, the DC / DC converter 23 boosts the voltage of the DC power supplied from the solar cell string 11 to the battery 30 via the battery control unit 24. Supply.

  The DC / DC converter 23 performs battery control on the direct-current power supplied from the solar cell string 11 without performing DC / DC conversion by the switching method when the control unit 21 performs fixed voltage control on the output of the solar cell string 11. The battery 30 is supplied via the unit 24.

  FIG. 3 shows a schematic configuration of the DC / DC converter 23. The DC / DC converter 23 includes a choke coil 231, a transistor 232, a diode 233, a capacitor 234, a voltage sensor 235, and a current sensor 236.

  The DC / DC converter 23 can operate as a step-up DC / DC converter by the choke coil 231, the transistor 232, the diode 233, and the capacitor 234.

  The voltage sensor 235 detects the output voltage of the solar cell string 11. The voltage sensor 235 transmits the detected output voltage value to the control unit 21.

  The current sensor 236 detects the output current of the solar cell string 11. The current sensor 236 transmits the detected output current value to the control unit 21.

  The DC / DC converter 23 receives a PWM (Pulse Width Modulation) signal from the control unit 21 when operating under MPPT control. The PWM signal received from the control unit 21 switches the transistor 232 and operates the DC / DC converter 23 as a step-up DC / DC converter. The control unit 21 modulates the pulse width of the PWM signal based on the output voltage of the solar cell string 11 acquired from the voltage sensor 235 and the output current of the solar cell string 11 acquired from the current sensor 236, and performs MPPT control. Do.

  When the DC / DC converter 23 operates under fixed voltage control, the DC / DC converter 23 receives a signal for turning off the transistor 232 from the control unit 21. In this case, since the transistor 232 does not perform a switching operation, the DC / DC converter 23 does not operate as a step-up DC / DC converter. When operating under fixed voltage control, the DC / DC converter 23 reduces the direct-current voltage supplied from the solar cell string 11 by the voltage drop due to the diode 233 and outputs it to the battery control unit 24.

  The MPPT control controls the output of the solar cell string 11 so as to follow the optimum operating point at which the maximum power can be extracted. Therefore, the output of the solar cell string 11 can be maximized by performing MPPT control. However, when MPPT control is executed, power necessary for MPPT control, such as power for switching the transistor 232, is generated. Further, in the MPPT control, a loss due to the conversion efficiency of the DC / DC converter 23 being smaller than 1 also occurs.

  Considering the power consumption and power loss caused by the MPPT control as described above, it cannot be said that the power generated by the solar cell 10 can be efficiently used by the MPPT control.

  For example, when the solar cell 10 is irradiated with sufficient solar radiation, even if there is a slight difference in the amount of solar radiation, there is almost no difference in the voltage at the optimum operating point. For example, in a solar cell module 12 of a certain size, the difference in power at the optimum operating point is about 0.12 [W] between the case where the amount of solar radiation is 1000 [W] and 800 [W]. In this case, if the switching loss due to MPPT control is larger than 0.12 [W], it is better to perform fixed voltage control at the optimum operating point voltage when the solar radiation amount is 1000 [W] without performing MPPT control. The generated power of the solar cell 10 can be used efficiently.

  Therefore, the control part 21 carries out fixed voltage control of the output of the solar cell string 11 when the solar radiation amount irradiated to the solar cell string 11 is more than a predetermined threshold value.

  The description will be continued with reference to FIG.

  The battery control unit 24 controls the magnitude of the current drawn by the battery 30 for charging based on the control signal from the control unit 21. When the current drawn by the battery 30 is increased, the output voltage of the DC / DC converter 23 is lowered, and when the current drawn by the battery 30 is reduced, the output voltage of the DC / DC converter 23 is raised. The control unit 21 controls the battery control unit 24 so that the output voltage of the DC / DC converter 23 becomes a predetermined voltage, thereby controlling the magnitude of the current drawn by the battery 30.

  The battery control unit 24 may not be included in the control device 20. For example, the battery 30 and the battery control unit 24 may be configured integrally.

  The voltage sensor 25 detects the output voltage of the DC / DC converter 23. The voltage sensor 25 transmits the detected output voltage value to the control unit 21.

  The communication unit 26 communicates with an ECU (Engine Control Unit) 40 provided inside the vehicle. The communication unit 26 acquires information such as safety information from the ECU 40. The communication unit 26 may communicate with an external server such as a weather server by wireless connection. The communication unit 26 may acquire the amount of solar radiation, regional information based on vehicle position information, regional information on the destination of the vehicle, and the like from an external server such as a weather server.

  Next, the operation of the control unit 21 will be described in detail.

  The control unit 21 acquires the value of the output voltage of the DC / DC converter 23 from the voltage sensor 25. The control unit 21 controls the battery control unit 24 so that the output voltage of the DC / DC converter 23 becomes a predetermined voltage, thereby controlling the magnitude of the current drawn by the battery 30.

  The control unit 21 performs MPPT control or fixed voltage control on the output of the solar cell string 11. The control unit 21 determines whether to perform MPPT control or fixed voltage control independently for each of the solar cell strings 11-1 to 11-N. For example, the control unit 21 performs fixed voltage control on N-1 solar cell strings 11-1 to 11- (N-1) and performs MPPT control only on the solar cell string 11-N. The output of the string 11 can be controlled.

  The control unit 21 determines whether or not MPPT control is required for the output of the solar cell string 11 based on the amount of solar radiation irradiated on the solar cell string 11.

  The control unit 21 does not perform MPPT control on the output of the solar cell string 11 when the amount of solar radiation applied to the solar cell string 11 is equal to or greater than a predetermined threshold. In this case, the control unit 21 performs fixed voltage control on the output of the solar cell string 11. As described above, when the amount of solar radiation applied to the solar cell string 11 is large, it is possible to efficiently use the generated power of the solar cell 10 by performing the fixed voltage control without performing the MPPT control. Because it can. The predetermined threshold value may be stored in the storage unit 22 in advance.

  The predetermined threshold may be set as a value in which the power loss due to deviation from the optimum operating point when the fixed voltage control is performed is smaller than the switching loss by the MPPT control when the amount of solar radiation is equal to or greater than the predetermined threshold. it can.

  The control unit 21 may change the predetermined threshold based on the deterioration status, usage history, total irradiation time, and the like of the solar cell 10, the solar cell string 11, and the solar cell module 12. Thereby, the control part 21 can set a predetermined | prescribed threshold value to an appropriate value according to the output fall etc. by degradation of the solar cell module 21. FIG.

  The control unit 21 performs MPPT control on the output of the solar cell string 11 when the amount of solar radiation applied to the solar cell string 11 is less than a predetermined threshold. FIG. 4 shows that the generated power of the solar cell 10 may be more efficiently used when the MPPT control is performed when the amount of solar radiation applied to the solar cell string 11 is less than a predetermined threshold. To explain.

  In the example illustrated in FIG. 4, the solar cell string 11 includes two solar cell modules 12 connected in series. FIG. 4A shows the IV curve of the solar cell string 11-1. In the solar cell string 11-1, it is assumed that sufficient solar radiation is applied to both of the two solar cell modules 12. FIG. 4B shows the IV curve of the solar cell string 11-2. The solar cell string 11-2 has a partial shadow, and one of the two solar cell modules 12 is irradiated with sufficient solar radiation, but the other one is in the shadow and is almost generating electricity. Make it not exist. The state as shown in FIG. 4B can occur, for example, when the position where the vehicle is parked is a place where a part of the solar cell string 11-2 is covered with a tree.

An IV curve 101 in FIG. 4A shows an IV curve of one solar cell module 12, and an IV curve 102 is an IV curve of two solar cell modules 12 connected in series, that is, a solar cell string. The IV curve of 11-1 is shown. In FIG. 4A, I _SC indicates a short-circuit current, and V _OC indicates an open circuit voltage. In the case shown in FIG. 4 (a), the control unit 21 is fixed voltage control the solar cell strings 11-1, DC / DC converter output voltage 23 is fixed voltage _{V 0} in so as the battery controller 24 Is controlled. The fixed voltage V ₀ is about 36 [V]. Further, the V _OC shown in FIG. 4A is assumed to be about 40 [V].

The IV curve 103 in FIG. 4B shows the IV curve of the entire two solar cell modules 12 connected in series, that is, the IV curve of the solar cell string 11-2. Of the two solar cell modules 12 included in the solar cell string 11-2, one of the solar cell modules 12 is shaded, and therefore hardly generates electricity. Therefore, the IV curve 103 of the solar cell string 11-2 is substantially equivalent to the IV curve 101 of FIG. The V _OC shown in FIG. 4B is assumed to be about 20 [V].

In the example shown in FIG. 4B, the output voltage of the DC / DC converter 23-2 is a fixed voltage V ₀ (36 [V]), which is the open circuit voltage of the solar cell string 11-2. The voltage is higher than V _OC (20 [V]). Therefore, when the output of the solar cell string 11-2 is controlled at a fixed voltage, the solar cell string 11-2 cannot supply DC power to the battery control unit 24. As a result, even though one solar cell module 12 that is not covered by the partial shadow can generate power, this generated power is wasted. In such a case, the control unit 21 performs the MPPT control on the output of the solar cell string 11-2, thereby effectively using the generated power of one solar cell module 12 receiving solar radiation. be able to. In the example shown in FIG. 4 (b), the control unit 21 when MPPT control the output of the solar cell string 11-2, the output voltage of the solar cell strings 11-2 becomes _{V M,} the DC / DC converter 23-2 The output voltage is V ₀ which is a fixed voltage.

  The control unit 21 estimates the amount of solar radiation applied to the solar cell string 11 based on the value of the output voltage of the solar cell string 11 acquired from the voltage sensor 235 of the DC / DC converter 23. The correspondence relationship between the output voltage of the solar cell string 11 and the amount of solar radiation may be stored in advance in the storage unit 22 as a table. The control unit 21 refers to the table stored in the storage unit 22 and irradiates the solar cell string 11 based on the output voltage value of the solar cell string 11 acquired from the voltage sensor 235 of the DC / DC converter 23. You may calculate (estimate) the amount of solar radiation.

  The control unit 21 may estimate the amount of solar radiation applied to the solar cell string 11 based on the value of the output current of the solar cell string 11 acquired from the current sensor 236 of the DC / DC converter 23. The correspondence relationship between the output current of the solar cell string 11 and the amount of solar radiation may be stored in advance in the storage unit 22 as a table. The control unit 21 refers to the table stored in the storage unit 22 and irradiates the solar cell string 11 based on the output current value of the solar cell string 11 acquired from the current sensor 236 of the DC / DC converter 23. You may calculate (estimate) the amount of solar radiation.

  The control unit 21 obtains regional information based on the vehicle position information, regional information on the destination of the vehicle, and the like from an external server such as a weather server via the communication unit 26, and the solar radiation irradiated on the solar cell string 11 The amount may be predicted.

  The solar cell system 1 may include a solar radiation meter that measures the amount of solar radiation irradiated on the solar cell module 12. The pyranometer may be configured using, for example, at least one solar battery cell among a plurality of solar battery cells included in the solar battery module 12. The solar cell module 12 is configured such that at least one solar cell used as a pyranometer among the plurality of solar cells is electrically independent. Specifically, the control part 21 measures the open circuit voltage value applied to the photovoltaic cell used as a solar radiation meter. The control unit 21 estimates the amount of solar radiation based on the measured open-circuit voltage value and the voltage value when the solar radiation is not irradiated. Moreover, the control part 21 may measure the electric current value which flows into the fixed load connected to the photovoltaic cell used as a solar radiation meter, and may estimate the amount of solar radiation from this measurement result. In addition, the photovoltaic cell used as a solar radiation meter does not contribute to the electric power generation of the photovoltaic module 12. In this way, by using at least one of the plurality of solar cells of the solar cell module 12 as a solar radiation meter, the solar radiation meter can be introduced at low cost. The control unit 21 may acquire the amount of solar radiation from a solar radiation meter.

  The controller 21 does not perform the MPPT control on the output of the solar cell string 11 immediately after the amount of solar radiation applied to the solar cell string 11 is less than a predetermined threshold value, but the state of being less than the predetermined threshold value continues for a predetermined time. In this case, MPPT control may be performed. As a result, for example, when the vehicle is moving at high speed and the solar radiation amount temporarily falls below a predetermined threshold due to a partial shadow caused by the shadow of a building, the control unit 21 changes the MPPT from the fixed voltage control. Switching to control can be suppressed.

  With reference to the flowchart shown in FIG. 5, an example of the operation of the control device 20 according to the embodiment of the present disclosure will be described.

  The control unit 21 of the control device 20 acquires the amount of solar radiation applied to the solar cell string 11. For example, the control unit 21 estimates the amount of solar radiation applied to the solar cell string 11 based on the value of the output voltage of the solar cell string 11 acquired from the voltage sensor 235 of the DC / DC converter 23 (step S101). .

  The control part 21 determines whether the solar radiation amount irradiated to the solar cell string 11 is more than a predetermined threshold value (step S102).

  When the amount of solar radiation irradiated to the solar cell string 11 is equal to or greater than a predetermined threshold (Yes in step S102), the control unit 21 performs fixed voltage control on the output of the solar cell string 11 (step S103).

  When the amount of solar radiation irradiated to the solar cell string 11 is less than the predetermined threshold (No in Step S102), the control unit 21 performs MPPT control on the output of the solar cell string 11 (Step S104).

  The control part 21 performs the process of step S101-S104 independently for every solar cell string 11. FIG. Moreover, the control part 21 may repeat the process of step S101-S104 every predetermined time.

  Thus, according to the present embodiment, the control unit 21 of the control device 20 determines whether or not MPPT control is required for the output of the solar cell 10 based on the amount of solar radiation irradiated on the solar cell 10. The control part 21 carries out fixed voltage control of the output of the solar cell string 11 about the solar cell string 11 in which the amount of solar radiation to be irradiated is larger and the generated voltage can be efficiently used when the fixed voltage control is performed. Moreover, the control part 21 carries out MPPT control of the output of the solar cell string 11 about the solar cell string 11 in which the amount of solar radiation to be irradiated is smaller and the generated power can be used more efficiently when MPPT control is performed. Therefore, according to the present embodiment, the power generated by the solar cell 10 mounted on the vehicle can be efficiently used.

  Although the embodiments of the present invention have been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various variations and modifications based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, the functions included in each component, each step, etc. can be rearranged so that there is no logical contradiction, and a plurality of components, steps, etc. can be combined or divided into one It is. Further, although the present invention has been described mainly with respect to the apparatus, the present invention is a method including steps executed by each component of the apparatus, a method executed by a processor included in the apparatus, a program, or a storage medium storing the program. Can also be realized. It should be understood that these are included within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Vehicle solar cell system 10 Solar cell 11 Solar cell string 12 Solar cell module 20 Control apparatus 21 Control part 22 Memory | storage part 23 DC / DC converter 231 Choke coil 232 Transistor 233 Diode 234 Capacitor 235 Voltage sensor 236 Current sensor 24 Battery control part 25 Voltage sensor 26 Communication unit 30 Battery 40 ECU

Claims (14)

A vehicle solar cell control device for controlling the output of a solar cell mounted on a vehicle,
A control unit capable of MPPT-controlling the output of the solar cell;
The said control part is a control apparatus of the solar cell for vehicles which determines the necessity of MPPT control with respect to the output of the said solar cell based on the solar radiation amount irradiated to the said solar cell. The vehicle solar cell control device according to claim 1,
The said control part is a control apparatus of the solar cell for vehicles which determines the necessity of MPPT control with respect to the output of the said solar cell provided with the several solar cell string connected in parallel with the said control apparatus. The vehicle solar cell control device according to claim 2,
The said control part is a control apparatus of the solar cell for vehicles which determines the necessity of MPPT control with respect to the output of this solar cell string based on the solar radiation amount irradiated to this solar cell string for every said solar cell string. The control device for a solar cell for a vehicle according to claim 3,
The said control part is a control apparatus of the vehicle solar cell which does not perform MPPT control with respect to the output of this solar cell string, when the solar radiation amount irradiated to the said solar cell string is more than a predetermined threshold value. The vehicle solar cell control device according to claim 3 or 4,
The said control part is a control apparatus of the solar cell for vehicles which carries out fixed voltage control of the output of this solar cell string, when the solar radiation amount irradiated to the said solar cell string is more than a predetermined threshold value. The vehicle solar cell control device according to any one of claims 3 to 5,
The said control part is a control apparatus of the vehicle solar cell which performs MPPT control of the output of this solar cell string, when the solar radiation amount irradiated to the said solar cell string is less than a predetermined threshold value. The vehicle solar cell control device according to any one of claims 3 to 5,
The said control part is a control apparatus of the solar cell for vehicles which carries out MPPT control of the output of this solar cell string, when the state which the amount of solar radiation irradiated to the said solar cell string is less than a predetermined threshold continues for a predetermined time. The vehicle solar cell control device according to any one of claims 2 to 7,
The said control part is a control apparatus of the solar cell for vehicles which estimates the solar radiation amount irradiated to this solar cell string based on the output voltage of the said solar cell string. The vehicle solar cell control device according to any one of claims 2 to 7,
The said control part is a control apparatus of the solar cell for vehicles which estimates the solar radiation amount irradiated to this solar cell string based on the output current of the said solar cell string. A control method for a vehicle solar cell control device for controlling the output of a solar cell mounted on a vehicle,
The control method of the control apparatus of the solar cell for vehicles including the step which determines the necessity of MPPT control with respect to the output of the said solar cell based on the solar radiation amount irradiated to the said solar cell. A vehicle solar cell system comprising a solar cell mounted on a vehicle, and a control device for controlling the output of the solar cell,
The control device includes a control unit capable of MPPT-controlling the output of the solar cell,
The said control part is a solar cell system for vehicles which determines the necessity of MPPT control with respect to the output of the said solar cell based on the solar radiation amount irradiated to the said solar cell. In the vehicle solar cell system according to claim 11,
The solar cell includes a plurality of solar cell strings connected in parallel to the control device,
The solar cell string is a vehicle solar cell system including a plurality of solar cell modules connected in series. The vehicle solar cell system according to claim 12,
Further comprising a pyranometer for measuring the amount of solar radiation applied to the solar cell module;
The said control part is a solar cell system for vehicles which acquires the said solar radiation amount from the said pyranometer. The vehicle solar cell system according to claim 13,
The solar radiation system is a solar cell system for vehicles, which is composed of at least one solar cell among the solar cell modules having a plurality of solar cells.

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