JP2017123765A - Vehicle solar cell system - Google Patents

Abstract

Provided is a system capable of effectively utilizing the generated power of a solar cell in a vehicle including a high-voltage first battery that supplies power to a motor that is a driving force source and a second battery that is charged by the generated power of the solar cell. To do. A solar cell system includes a first battery, a second battery, a power receiving unit that receives power supply from the second battery, a first power conversion device provided between the solar cell and the first battery, and a second battery. A second power conversion device provided between the battery and the power receiving unit is provided. When the vehicle is turned off and the charging permission condition for the first battery is satisfied, the first power conversion device is operated to charge the first battery with the generated power of the solar cell. If the charging permission condition for the first battery is not satisfied and charging of the first battery cannot be started immediately, the second power converter is operated to supply power from the second battery to the power receiving unit. Is adjusted to be lower than a predetermined value corresponding to full charge. [Selection] Figure 3

Description

  The present invention relates to a vehicle solar cell system.

  2. Description of the Related Art Conventionally, a vehicle solar cell system including a high-voltage first battery that supplies electric power to a motor that drives a vehicle and a solar cell that can supply generated power to a second battery other than the first battery (for example, an auxiliary battery) Known (for example, see Patent Document 1).

Japanese Patent Laying-Open No. 2015-082866

  By the way, during the period from the ignition on to the ignition off of the vehicle, the first battery performs the charge / discharge operation for running the vehicle. Therefore, the second battery is charged with the generated power of the solar cell and the vehicle is in the ignition off state. The first battery may be charged with the generated power of the solar cell.

  However, even when the vehicle is turned off, for example, when waiting for the temperature drop of the first battery whose temperature has increased during traveling, or when waiting for the completion of the process of learning the storage amount when the ignition is turned off, In some cases, charging of one battery cannot be started. In such a case, it is desirable to continuously charge the second battery with the generated power of the solar cell, but if the second battery is fully charged, the generated power of the solar cell cannot be charged. Therefore, there is a possibility that effective use of energy cannot be performed.

  Therefore, in view of the above problems, in a vehicle including a high-voltage first battery that supplies power to a motor that is a driving force source, and a second battery that is charged with power generated by a solar cell from ignition on to ignition off. When the ignition is turned off, when the first battery is charged with the generated power of the solar cell, the charging permission condition for the first battery is not satisfied after the vehicle ignition is turned off, and charging of the first battery cannot be started immediately. Even so, it is an object of the present invention to provide a vehicle solar cell system capable of effectively utilizing the power generated by the solar cell.

In order to achieve the above object, in one embodiment of the present invention,
A solar cell mounted on the vehicle;
A first battery that supplies electric power to an electric motor that is a driving force source of the vehicle;
A second battery that is charged with power generated by the solar cell;
A power receiving unit that receives power from the second battery;
A first power conversion device provided between the solar cell and the first battery;
A second power conversion device provided between the second battery and the power reception unit;
First control for charging the first battery with the generated power of the solar cell by controlling the operation of the first power converter when the vehicle is turned off and the charging permission condition for the first battery is satisfied. And
A second control unit that adjusts a storage amount of the second battery by controlling the operation of the second power converter;
With
The second control unit is configured so that the amount of power stored in the second battery at the time when the vehicle is turned off is lower than a predetermined value corresponding to full charge, from the ignition on to the ignition off of the vehicle. Adjusting the amount of electricity stored in the second battery;
A vehicle solar cell system is provided.

  According to one embodiment of the present invention, the vehicle solar cell system is configured to control the operation of the first power converter when the vehicle is turned off and the charging permission condition for the first battery is satisfied. A first control unit that charges the first battery with generated power, and a second control unit that adjusts the amount of electricity stored in the second battery by controlling the operation of the second power converter. Then, the second control unit performs the second battery from the ignition on to the ignition off of the vehicle so that the amount of charge of the second battery at the time when the vehicle is turned off is lower than a predetermined value corresponding to full charge. Adjust the amount of electricity stored. Therefore, since the amount of charge stored in the second battery at the time when the vehicle is turned off becomes lower than a predetermined value corresponding to full charge, the first battery charging permission condition is not satisfied immediately after the vehicle is turned off. Even if it exists, it becomes possible to charge a 2nd battery with the generated electric power of a solar cell continuously, and can utilize the generated electric power of a solar cell effectively.

  According to the present embodiment, in a vehicle including a high-voltage first battery that supplies electric power to a motor that is a driving force source, and a second battery that is charged with power generated by a solar cell from ignition on to ignition off. When the vehicle is turned off, when the first battery is charged with the generated power of the solar battery, the first battery charging permission condition is not satisfied after the vehicle is turned off, and charging of the first battery cannot be started immediately. Even if it is a situation, the solar cell system for vehicles which can use effectively the generated electric power of a solar cell can be provided.

It is a block diagram which shows an example of a structure of the solar cell system for vehicles which concerns on 1st Embodiment. It is a flowchart which shows roughly an example of the process by the solar cell system for vehicles (buffer battery control part) which concerns on 1st Embodiment. It is a timing chart which shows an example of operation by a solar cell system for vehicles concerning a 1st embodiment (a buffer battery control part, a main battery control part). It is a block diagram which shows an example of a structure of the solar cell system for vehicles which concerns on 2nd Embodiment. It is a flowchart which shows roughly an example of the process by the solar cell system for vehicles (buffer battery control part) which concerns on 2nd Embodiment. It is a timing chart which shows an example of operation by a solar cell system for vehicles concerning a 2nd embodiment (a buffer battery control part, a main battery control part).

  Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a block diagram illustrating an example of a configuration of a vehicle solar cell system (hereinafter simply referred to as a solar cell system) 1 according to the present embodiment. The solar cell system 1 includes a solar cell panel 10, a buffer battery 20, a DC-DC converter 30, an auxiliary battery 40, a DC-DC converter 50, a main battery 60, a DC-DC converter 70, an ECU (Electrical
Control Unit) 80. Hereinafter, unless otherwise specified, “vehicle” refers to a vehicle on which the solar cell system 1 is mounted.

  In FIG. 1, a solid line represents a power system, and a dotted line represents a control (signal) system.

  The solar cell panel 10 is a panel-like module in which a plurality of solar cells are connected in series and in parallel, and can generate generated power corresponding to the amount of solar radiation. As a solar cell included in the solar cell panel 10, any type of solar cell may be applied. For example, an optimum solar cell (for example, a solar cell for a moving body) is used depending on the application. Selected.

  The buffer battery 20 (an example of a second battery) is a power storage device that temporarily stores the generated power of the solar cell panel 10. The buffer battery 20 is a secondary battery such as a nickel-metal hydride battery or a lithium ion battery having a rated voltage of 20 V, for example.

  The sensor 20 s is a known detection unit that detects various states (current, voltage, temperature, charge state, etc.) of the buffer battery 20. The sensor 20s is communicably connected to the ECU 80 through a one-to-one communication line with the ECU 80 or an in-vehicle network such as a CAN (Controller Area Network), and detection signals regarding various states of the buffer battery 20 are transmitted to the ECU 80.

  The DC-DC converter 30 is a power conversion device that converts power supplied from the solar battery panel 10 into power in a voltage range suitable for the buffer battery 20. The DC-DC converter 30 operates so that the generated current or generated voltage of the solar cell panel 10 becomes a set value in accordance with, for example, a control command from the ECU 80 (a solar cell control unit 81 described later).

  The auxiliary battery 40 (an example of a power receiving unit) is a power storage device that supplies driving power to auxiliary devices (lighting device, wiper, audio device, various ECUs, etc.) mounted on the vehicle. The auxiliary battery 40 is, for example, a secondary battery such as a lead battery having a rated voltage of 12 V or a lithium ion battery. The auxiliary battery 40 is connected to the buffer battery 20 through the DC-DC converter 50 and is supplied from the buffer battery 20 (generated power supplied from the solar cell panel 10 through the buffer battery 20). Can be charged.

  The DC-DC converter 50 (an example of a second power conversion device) is provided between the buffer battery 20 and the auxiliary battery 40 and adjusts the voltage input from the buffer battery 20 (for example, reduces the voltage). This is a power conversion device that outputs to the auxiliary battery 40. The DC-DC converter 50 can adjust the power output to the auxiliary battery 40 in accordance with a control command from the ECU 80 (a buffer battery control unit 82 described later). That is, the DC-DC converter 50 adjusts the voltage output to the auxiliary battery 40 to adjust the amount of power supplied from the buffer battery 20 to the auxiliary battery 40, or from the buffer battery 20 to the auxiliary battery. It is possible to prevent power from being supplied to 40.

  The main battery 60 is a high-voltage (for example, output voltage 250 V to 300 V) power storage device that supplies power to an electric motor (not shown) that drives the vehicle. The main battery 60 is a secondary battery such as a nickel metal hydride battery or a lithium ion battery, for example. The main battery 60 can be charged with electric power supplied from the buffer battery 20 (generated electric power supplied from the solar cell panel 10 via the buffer battery 20) via the DC-DC converter 70.

  The DC-DC converter 70 (an example of the first power converter) is provided between the buffer battery 20 and the main battery 60, adjusts the voltage input from the buffer battery 20 (for example, boosts), This is a power converter that outputs to the main battery 60. The DC-DC converter 70 can adjust the power output to the main battery 60 in accordance with a control command from the ECU 80 (a main battery control unit 83 described later). That is, the DC-DC converter 70 adjusts the amount of power supplied from the buffer battery 20 to the main battery 60 by adjusting the voltage output to the main battery 60, or the power from the buffer battery 20 to the main battery 60. It is possible not to supply.

  The ECU 80 is an electronic control unit that executes main control processing in the solar cell system 1. The ECU 80 is configured by, for example, a microcomputer and can implement various control processes by executing various programs stored in the ROM on the CPU. The ECU 80 includes a solar cell control unit 81, a buffer battery control unit 82, and a main battery control unit 83 as functional units realized by executing one or more programs on the CPU.

  The solar cell control unit 81 performs power generation control of the solar cell panel 10, for example, known MPPT (Maximum Power Point Tracking) control by performing operation control of the DC-DC converter 30. The solar cell control unit 81 outputs a control command including a set value of the generated current or generated voltage (the input current or input voltage of the DC-DC converter 30) of the solar cell panel 10 to the DC-DC converter 30, thereby The MPPT control of the solar cell panel 10 is executed while changing the generated current and generated voltage of the battery panel 10.

  The buffer battery control unit 82 (an example of a second control unit) controls the discharge amount from the buffer battery 20 to the auxiliary battery 40 by controlling the operation of the DC-DC converter 50, and the stored amount of the buffer battery 20. C (power storage state) is controlled. That is, since the generated power corresponding to the amount of solar radiation is supplied from the solar battery panel 10 to the buffer battery 20, the buffer battery control unit 82 adjusts the amount of discharge to the auxiliary battery 40, whereby the buffer battery 20 Can be controlled. The buffer battery control unit 82 controls the charged amount C (charged state) of the buffer battery 20 while monitoring the charged amount C of the buffer battery 20 according to the detection signal regarding the charged state of the buffer battery 20 received from the sensor 20s. To do. Details will be described later.

  The main battery control unit 83 (an example of a first control unit) controls the operation of the DC-DC converter 70, thereby executing charging control of the main battery 60 using electric power supplied from the buffer battery 20. Specifically, the main battery control unit 83 starts charging the main battery 60 by supplying power from the buffer battery 20 when the vehicle is turned off (IG-OFF) and the charging permission condition for the main battery 60 is satisfied. To do. Then, the main battery control unit 83 ends the charging of the main battery 60 by supplying power from the buffer battery 20 when the charged amount C of the buffer battery 20 becomes equal to or less than the predetermined amount C1.

  The predetermined amount C1 is a lower limit value of the charged amount C provided to prevent the deterioration of the buffer battery 20 from progressing. The charging permission condition is defined in advance as a condition for permitting charging of the main battery 60. The charging permission condition is, for example, “the temperature of the main battery 60 has dropped to a predetermined temperature or less”, “the battery ECU (not shown) that monitors the main battery 60 has completed the learning process of the storage amount (storage state). "What has been done". In addition, the ignition off means that the vehicle is stopped, that is, the vehicle is brought into a state in which the vehicle cannot travel according to the operation of the driver. For example, a control device (for example, cooperative control of the entire vehicle (for example, This is a concept including stopping the HV-ECU and the like.

  Next, characteristic operations of the solar cell system 1 according to this embodiment will be described with reference to FIGS.

  FIG. 2 is a flowchart schematically showing an example of processing by the solar cell system 1 (buffer battery control unit 82) according to the present embodiment. The processing according to this flowchart is repeatedly executed at predetermined time intervals.

  In step S <b> 102, the buffer battery control unit 82 determines whether or not the main battery 60 is being charged with power from the buffer battery 20. When the main battery 60 is not being charged with the electric power from the buffer battery 20, the buffer battery control unit 82 proceeds to step S104. When the main battery 60 is being charged, the buffer battery control unit 82 proceeds to step S110.

  In step S104, buffer battery control unit 82 determines whether or not the vehicle is turned on (IG-ON). The buffer battery control unit 82 proceeds to step S106 when the vehicle is not IG-ON (in an IG-OFF state), and proceeds to step S108 when the vehicle is IG-ON (in an IG-ON state). Proceed to

  In step S106, the buffer battery control unit 82 sets the target value Ctgt of the charged amount C of the buffer battery 20 to a predetermined amount C2 (> C1), and controls the discharge amount from the buffer battery 20 to the auxiliary battery 40. (Discharge control). Thereby, the charged amount C of the buffer battery 20 is converged to and maintained at the predetermined amount C2.

  The predetermined amount C2 is, for example, a storage amount (storage state) corresponding to a fully charged state of the buffer battery 20.

  On the other hand, in step S108, the buffer battery control unit 82 sets the target value Ctgt of the charged amount C of the buffer battery 20 to a predetermined amount C3 (> C1) lower than the predetermined amount C2, and from the buffer battery 20 to the auxiliary battery 40. Control the amount of discharge to (discharge control). Thereby, the charged amount C of the buffer battery 20 is converged and maintained at a predetermined amount C3 lower than the predetermined amount C2.

  The predetermined amount C3 takes into account the total amount of power generated by the solar cell panel 10 between the IG-OFF of the vehicle and the maximum time Tmax that is assumed until the charging permission condition for the main battery 60 is satisfied. Predefined. For example, the predetermined amount C3 is set to be equal to or less than a value obtained by subtracting the total power generation amount Pmax when the solar battery panel 10 generates power with the maximum power during the maximum time Tmax from the power storage amount corresponding to the full charge of the buffer battery 20. The

  If it is determined in step S102 that the main battery 60 is being charged with power from the buffer battery 20, the buffer battery control unit 82 controls the operation of the DC-DC converter 50 in step S110. Discharge from the buffer battery 20 to the auxiliary battery 40 is prevented.

  Subsequently, FIG. 3 is a timing chart showing an example of the operation of the solar cell system 1 (buffer battery control unit 82, main battery control unit 83) according to the present embodiment. Specifically, it is a timing chart showing the transition of the charged amount C of the buffer battery 20.

  As shown in FIG. 3, at time t1 when the vehicle is in the IG-OFF state, the charged amount C of the buffer battery 20 has decreased to a predetermined amount C1, so that as described above, the main battery control unit 83 The charging of the main battery 60 by the power supply from the battery 20 is terminated.

  Between time t1 and time t2 when the vehicle is in the IG-OFF state, the buffer battery control unit 82 performs the process of step S106 in FIG. 2, and the charged amount C of the buffer battery 20 is changed from the predetermined amount C1 to the predetermined amount C2. Ascend towards.

  When the vehicle is IG-ON at time t2, between time t2 and time t3, the buffer battery control unit 82 performs the process of step S108 in FIG. It decreases toward the fixed amount C3, and reaches a predetermined amount C3 at time t3.

  Between time t3 and time t4, the charged amount C of the buffer battery 20 is substantially maintained at the predetermined amount C3 by the process of step S108 in FIG.

  When the vehicle is IG-OFF at time t4, the charging permission condition for the buffer battery 20 is not immediately established. Therefore, the buffer battery control unit 82 performs the process of step S106 in FIG. The amount C increases toward the predetermined amount C2.

  When the charging permission condition for the buffer battery 20 is satisfied at time t5 when the vehicle is in the IG-OFF state, the buffer battery control unit 82 performs the process of step S110 of FIG. Stop discharging. Then, as described above, the main battery control unit 83 starts charging the main battery 60 by supplying power from the buffer battery 20.

  Since the charged amount C of the buffer battery 20 has decreased to the predetermined amount C1 at time t6, the main battery control unit 83 finishes charging the main battery 60 by supplying power from the buffer battery 20 as described above. To do.

  As described above, in this embodiment, the main battery control unit 83 controls the operation of the DC-DC converter 70 when the vehicle is IG-OFF and the charging permission condition for the main battery 60 is satisfied (buffer) The main battery 60 is charged with the generated power of the solar cell panel 10 (via the battery 20). Further, the buffer battery control unit 82 controls the operation of the DC-DC converter 50 so that the charged amount C of the buffer battery 20 at the time when the vehicle is IG-OFF is lower than a predetermined amount C2 corresponding to full charge. (So that the predetermined amount C3 is lower than the predetermined amount C2), the charged amount C of the buffer battery 20 is adjusted from the IG-ON to the IG-OFF of the vehicle. Therefore, since the charged amount C of the buffer battery 20 at the time when the vehicle is IG-OFF is lower than the predetermined amount C2 corresponding to full charge, immediately after the vehicle IG-OFF, the charge permission condition for the main battery 60 is satisfied. Even in a situation where it does not hold, the buffer battery 20 can be continuously charged with the power generated by the solar cell panel 10, and the power generated by the solar cell panel 10 can be used effectively.

[Second Embodiment]
Next, a second embodiment will be described.

  The solar cell system 1A according to the present embodiment is different from the solar cell system 1 according to the first embodiment in that a navigation device 90 is added. Further, the solar cell system 1A according to the present embodiment is different from the first embodiment in that the ECU 80 is replaced with the ECU 80A, specifically, the buffer battery control unit 82 is replaced with the buffer battery control unit 82A. It differs from the solar cell system 1 which concerns on. Hereinafter, the same components as those of the first embodiment are denoted by the same reference numerals, and different portions will be mainly described.

  FIG. 4 shows an example of the configuration of the solar cell system 1A according to the present embodiment. The solar cell system 1A includes a solar cell panel 10, a buffer battery 20, a DC-DC converter 30, an auxiliary battery 40, a DC-DC converter 50, a main battery 60, a DC-DC converter 70, an ECU 80A, and a navigation device 90.

  The ECU 80 </ b> A is an electronic control unit that executes main control processing in the solar cell system 1. The ECU 80A is constituted by, for example, a microcomputer and can implement various control processes by executing various programs stored in the ROM on the CPU. ECU 80A includes a solar cell control unit 81, a buffer battery control unit 82A, and a main battery control unit 83 as functional units realized by executing one or more programs on the CPU.

  The buffer battery control unit 82 </ b> A (an example of a second control unit) controls the discharge amount from the buffer battery 20 to the auxiliary battery 40 by controlling the operation of the DC-DC converter 50. C (power storage state) is controlled. That is, since the generated power corresponding to the amount of solar radiation is supplied from the solar battery panel 10 to the buffer battery 20, the buffer battery control unit 82A adjusts the amount of discharge to the auxiliary battery 40, thereby Can be controlled. The buffer battery control unit 82A controls the storage amount C (storage state) of the buffer battery 20 while monitoring the storage amount of the buffer battery 20 according to the detection signal regarding the storage state of the buffer battery 20 received from the sensor 20s. . In addition, the buffer battery control unit 82 </ b> A controls the storage amount C (storage state) of the buffer battery 20 based on the expected time Tr until the destination received from the navigation device 90 is reached. Details will be described later.

  The navigation device 90 performs route guidance to a destination manually set by a passenger such as a vehicle driver or a destination automatically set by a learning function or the like. When the route to the destination is determined by a predetermined operation by an occupant or the like, the navigation device 90 reaches the destination based on the traveling state of the vehicle (vehicle speed or the like), road information (congestion information) received from the outside, or the like. The time (expected time) Tr that is expected to be taken is calculated sequentially. The navigation device 90 is communicably connected to the ECU 80A through an in-vehicle network such as CAN, and the expected time Tr calculated sequentially is transmitted to the ECU 80A.

  Next, a characteristic operation of the solar cell system 1A according to the present embodiment will be described with reference to FIGS.

  FIG. 5 is a flowchart schematically showing an example of processing by the solar cell system 1A (buffer battery control unit 82) according to the present embodiment. The processing according to this flowchart is repeatedly executed at predetermined time intervals.

  The processing in steps S202, S204, S206, S208, and S210 in the flowchart in FIG. 5 is the same as the processing in steps S102, S104, S106, S108, and S110 in the flowchart in FIG. 2, and steps S204 (S104) and S208 ( 108), step S207 is newly added. The following description will focus on the different parts.

  If it is determined in step S204 that the vehicle is IG-ON (in an IG-ON state), the buffer battery control unit 82A determines that the expected time Tr received from the navigation device 90 is a predetermined value in step S207. It is determined whether or not it is shorter than the time Tth. The predetermined time Tth is set in advance as a time necessary for reducing the charged amount C of the buffer battery 20 from the predetermined amount C2 to the predetermined amount C3. For example, the predetermined time Tth is a time required to reduce the charged amount C of the buffer battery 20 from the predetermined amount C3 to the predetermined amount C2 in a state where the power consumption of the auxiliary equipment mounted on the vehicle is minimum. Determined by simulation or the like. If the predicted time Tr is not shorter than the predetermined time Tth, the buffer battery control unit 82A proceeds to step S206, sets the target value Ctgt of the charged amount C of the buffer battery 20 to the predetermined amount C2, and the predicted time Tr is the predetermined time. If shorter than Tth, the process proceeds to step S208, and the target value Ctgt is set to a predetermined amount C3.

  In the case where the destination is not set in the navigation device 90, the process may always proceed to step S208 in the process of step S207. Thereby, the buffer battery control unit 82A can perform the same processing as the buffer battery control unit 82 of the first embodiment.

  Next, FIG. 6 is a timing chart showing an example of the operation of the solar cell system 1A (buffer battery control unit 82A, main battery control unit 83) according to the present embodiment. Specifically, it is a timing chart showing the transition of the charged amount C of the buffer battery 20.

  As shown in FIG. 6, at time t1 when the vehicle is in the IG-OFF state, the charged amount C of the buffer battery 20 is reduced to the predetermined amount C1, so that the main battery control unit 83 is The charging of the main battery 60 by the power supply from the battery 20 is terminated.

  Between time t1 and time t2 when the vehicle is in the IG-OFF state, the buffer battery control unit 82A performs the process of step S206 in FIG. 5, and the charged amount C of the buffer battery 20 is changed from the predetermined amount C1 to the predetermined amount C2. Ascend towards.

  When the vehicle is IG-ON at time t2 and the destination is set by the navigation device 90, the buffer battery control unit 82A continues from step t2 to time t3 in step S206 of FIG. Processing is performed, and the charged amount C of the buffer battery 20 rises toward the predetermined amount C2, and reaches the predetermined amount C2 at time t3.

  Between time t3 and time t4, the charged amount C of the buffer battery 20 is substantially maintained at the predetermined amount C2 by the process of step S206 of FIG.

  When the predicted time Tr reaches the predetermined time Tth at time t4, the buffer battery control unit 82A performs the process of step S208 between time t4 and time t5, and the charged amount C of the buffer battery 20 is equal to the predetermined amount. It decreases toward C3 and reaches a predetermined amount C3 at time t5 (immediately before).

  When the vehicle reaches the destination at time t5 and is IG-OFF, the charging permission condition for the buffer battery 20 is not immediately established. Therefore, the buffer battery control unit 82A performs the process of step S206 in FIG. As a result, the charged amount C of the buffer battery 20 increases toward the predetermined amount C2.

  When the charging permission condition for the buffer battery 20 is satisfied at time t6 when the vehicle is in the IG-OFF state, the buffer battery control unit 82A performs the process of step S210 in FIG. Stop discharging. Then, as described above, the main battery control unit 83 starts charging the main battery 60 by supplying power from the buffer battery 20.

  Since the charged amount C of the buffer battery 20 has decreased to the predetermined amount C1 at time t7, the main battery control unit 83 ends the charging of the main battery 60 by the power supply from the buffer battery 20 as described above. To do.

  As described above, in this embodiment, the buffer battery control unit 82A controls the operation of the DC-DC converter 50 so that the charged amount C of the buffer battery 20 at the time when the vehicle is IG-OFF corresponds to full charge. The charged amount C of the buffer battery 20 is adjusted during the period from IG-ON to IG-OFF of the vehicle so as to be lower than the predetermined amount C2 to be performed (so that the predetermined amount C3 is lower than the predetermined amount C2). Therefore, there exists an effect | action and effect similar to 1st Embodiment.

  As mentioned above, although the form for implementing this invention was explained in full detail, this invention is not limited to this specific embodiment, In the range of the summary of this invention described in the claim, various Can be modified or changed.

1,1A Solar cell system 10 Solar cell panel (solar cell)
20 Buffer battery (second battery)
20s sensor 30 DC-DC converter 40 Auxiliary battery (power receiving unit)
50 DC-DC converter (second power converter)
60 Main battery (first battery)
70 DC-DC converter (first power converter)
80,80A ECU
81 Solar cell control unit 82, 82A Buffer battery control unit (second control unit)
83 Main battery control unit (first control unit)
90 Navigation device

Claims (1)

A solar cell mounted on the vehicle;
A first battery that supplies electric power to an electric motor that is a driving force source of the vehicle;
A second battery that is charged with power generated by the solar cell;
A power receiving unit that receives power from the second battery;
A first power conversion device provided between the solar cell and the first battery;
A second power conversion device provided between the second battery and the power reception unit;
First control for charging the first battery with the generated power of the solar cell by controlling the operation of the first power converter when the vehicle is turned off and the charging permission condition for the first battery is satisfied. And
A second control unit that adjusts a storage amount of the second battery by controlling the operation of the second power converter;
With
The second control unit is configured so that the amount of power stored in the second battery at the time when the vehicle is turned off is lower than a predetermined value corresponding to full charge, from the ignition on to the ignition off of the vehicle. Adjusting the amount of electricity stored in the second battery;
Vehicle solar cell system.

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