JP2019088156A - Solar system - Google Patents

Abstract

To provide a solar system which allows for efficient utilization of electrical power generated by a solar panel.SOLUTION: A solar system mounted on vehicle includes a solar panel generating electricity with sunlight, a first chargeable and dischargeable battery, a second chargeable and dischargeable battery, a power conversion part for outputting the electricity, generated by the solar panel, to the first battery, a load for consuming the electricity, a first relay connecting the first battery and the load disconnectibly, and a second relay connecting the second battery and the load disconnectibly. While the power storage amount of the second battery is larger than a prescribed threshold level in a power supply state where vehicle travel is not allowed, the first relay disconnects the first battery from the load, and while idling stop of engine in a power supply state where vehicle travel is allowed, the second relay disconnects the second battery from the load.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a solar system mounted on a vehicle.

  For example, Patent Document 1 discloses a system that uses the power stored in an auxiliary battery while the vehicle is parked and the power generated by a solar panel (solar power generation device) for the comfort of a vehicle interior. ing.

JP 2004-338373 A

  Since the system described in Patent Document 1 operates only while the vehicle is parked, the power generated by the solar panel while the vehicle is traveling is wasted. In addition, even when the vehicle is parked, the system does not operate when the temperature inside the vehicle is at a suitable temperature, etc., so the power generated by the solar panel is wasted. That is, the system described in Patent Document 1 does not efficiently use the power generated by the solar panel.

  This invention is made in view of the said subject, and it aims at providing the solar system which can utilize efficiently the electric power electric-power-generated by the solar panel.

  In order to solve the above-mentioned subject, one mode of the present invention is a solar system carried in vehicles, and the solar panel which generates electricity by sunlight, the chargeable and dischargeable first battery, and the chargeable and dischargeable second A battery, a power conversion unit for outputting power generated by the solar panel to the first battery, a load for consuming the power, a first relay for disconnectably connecting the first battery and the load, and a second battery And a second relay for disconnectably connecting the load, wherein the first relay is configured to transmit the first battery while the storage amount of the second battery is larger than a predetermined threshold in a power supply state in which vehicle travel is not permitted. Disconnecting from the load, the second relay disconnects the second battery from the load while the engine is idled off under power conditions that allow vehicle travel. And wherein the door.

  According to the solar system of this aspect, the electric power generated by the solar panel can be output to the first battery regardless of whether the vehicle is traveling or parking. Therefore, it can control that the electric power generated with the solar panel is wasted. In addition, the first relay and the second relay are switched according to the condition of the vehicle, and the power of the first battery is supplied to the load or the second battery, thereby improving fuel efficiency or suppressing overdischarge of the second battery. You can do it.

  The solar system of the present invention can efficiently utilize the power generated by the solar panel.

A figure showing an example of composition of a solar system concerning one embodiment of the present invention Control flow chart implemented in solar system Control flow chart implemented in solar system

[Overview]
A solar system mounted on a vehicle according to the present embodiment includes a battery capable of charging and discharging the power generated by the solar panel regardless of whether the vehicle is traveling or parking. Thus, it is possible to suppress the waste of the power generated by the solar panel.

[Configuration of solar system]
FIG. 1 is a view showing a configuration example of a solar system 10 according to an embodiment of the present invention. The solar system 10 of the present embodiment illustrated in FIG. 1 includes a solar panel 11, a power conversion unit 12, a first battery 13, a second battery 14, a first relay 15, a second relay 16, and 3 relay 17 and a control unit 18 are provided. The alternator 21, the starter 22, the load 23, and the accessory output terminal 24 are connected to the first battery 13, the second battery 14, the first relay 15, the second relay 16, and the third relay 17, respectively. There is. Note that in FIG. 1, the wiring through which the power signal flows is indicated by a solid line, and the wiring through which a control signal or the like flows is indicated by a broken line.

  The solar panel 11 is a solar cell module that receives power of sunlight to generate power. The power generated by the solar panel 11 (hereinafter referred to as “generated power X”) is output to the power conversion unit 12. The solar panel 11 can be installed, for example, on the roof of a vehicle.

  The power conversion unit 12 is configured to be able to receive the generated power X of the solar panel 11, convert the generated power X into a predetermined power, and output the power to the first battery 13. The power conversion unit 12 includes, for example, a DCDC converter. The power conversion unit 12 can set the operating point of the solar panel 11 using well-known Maximum Power Point Tracking (MPPT) control.

  The first battery 13 is a power storage element configured to be chargeable and dischargeable, such as a lithium battery or a nickel hydrogen battery, for example. The first battery 13 is chargeably connected to the power conversion unit 12 by the power output from the power conversion unit 12. Further, the first battery 13 is connected to the alternator 21 and the load 23 via the first relay 15 and the accessory output terminal 24 via the third relay 17.

  The second battery 14 is a chargeable and dischargeable power storage element such as a lead storage battery, for example. The second battery 14 is connected to the starter 22. Further, the second battery 14 is connected to the alternator 21 and the load 23 via the second relay 16.

  The first relay 15 is inserted between the first battery 13 and the alternator 21 and the load 23. The first relay 15 connects or disconnects the load 23 to the first battery 13 in accordance with an instruction from the control unit 18.

  The second relay 16 is inserted between the second battery 14 and the alternator 21 and the load 23. The second relay 16 connects or disconnects the load 23 to the second battery 14 in accordance with an instruction from the control unit 18.

  The third relay 17 is inserted between the first battery 13 and the first relay 15 and the accessory output terminal 24. The third relay 17 connects or disconnects the accessory output terminal 24 to the first battery 13 in accordance with an instruction from the control unit 18.

  The control unit 18 acquires the generated power X of the solar panel 11, the storage amount B1 of the first battery 13, and the storage amount B2 of the second battery 14, respectively. Further, the control unit 18 acquires vehicle information including the power supply state (whether the vehicle is in the Ready-ON state) and the engine state (whether or not the idling stop state) from the on-vehicle apparatus (not shown). Then, the control unit 18 determines the power conversion unit 12, the first relay 15, the second relay 16, and the third relay 17 based on the acquired generated power X, the storage amount B1, the storage amount B2, and the vehicle information. Control ON / OFF respectively.

  Typically, all or part of the power conversion unit 12 and the control unit 18 described above are an electronic control unit (ECU: Electronic Control) including a central processing unit (CPU), a memory, and an input / output interface. Configured as a unit). In the electronic control unit, the CPU reads and executes a program stored in the memory to realize the above-described predetermined function.

  The alternator 21 is a generator driven by the power of an engine (not shown) to generate electric power. The starter 22 is a starting device that cranks and starts the engine. The starter 22 operates with the power supplied from the second battery 14. The load 23 is a component that consumes the power of the first battery 13 and / or the second battery 14, and is configured of one or more electronic devices or equipment mounted on the vehicle. The accessory output terminal 24 is, for example, an accessory socket or a cigar socket, and is a power supply outlet capable of supplying power to an electrical component or the like connected to the terminal.

[Control executed by solar system]
Next, the control performed by the solar system 10 according to an embodiment of the present invention will be described with further reference to FIGS. 2 and 3. The process shown in FIG. 2 and the process shown in FIG. 3 are executed independently of each other in principle.

  FIG. 2 will be described. FIG. 2 is a flowchart showing a processing procedure of ON / OFF control that the control unit 18 performs on the power conversion unit 12.

  Step S21: It is determined whether the generated power X of the solar panel 11 exceeds a predetermined threshold value α. The threshold value α is a power value for determining whether it is significant to process the power generated by the solar panel 11. For example, if the generated power X of the solar panel 11 is lower than the power required for the operation of the power conversion unit 12, there is no point in operating the power conversion unit 12. Therefore, the threshold value α can be set to the power value necessary for the operation of the power conversion unit 12. If the generated power X exceeds the threshold value α, it is determined that the processing of the generated power X is significant, and the process proceeds to step S22. On the other hand, when the generated power X does not exceed the threshold value α, it is determined that the processing of the generated power X is not significant, and the process proceeds to step S24.

  Step S22: It is determined whether the storage amount B1 of the first battery 13 has reached a predetermined threshold value β. The threshold value β can be set to, for example, an upper limit storage amount at which the first battery 13 does not need to be charged any more. If the storage amount B1 has reached the threshold value β, it is determined that there is no supply destination of the generated power X, and the process proceeds to step S23. On the other hand, when the storage amount B1 has not reached the threshold value β, it is determined that there is a supply destination of the generated power X, and the process proceeds to step S25.

  Step S23: The power conversion unit 12 is stopped for a predetermined first time (OFF control). While the power conversion unit 12 is stopped, the generated power X of the solar panel 11 is discarded without being processed. This first time can be set arbitrarily. When the first time has elapsed, the process returns to step S21.

  Step S24: The power conversion unit 12 is stopped for a predetermined second time (OFF control). While the power conversion unit 12 is stopped, the generated power X of the solar panel 11 is discarded without being processed. The second time may be set arbitrarily, and may be the same as or different from the first time. When the second time has elapsed, the process returns to step S21.

  Step S25: The power conversion unit 12 is operated (ON control). Thus, the generated power X of the solar panel 11 is output to the first battery 13. The power conversion unit 12 can control the power generated by the solar panel 11 using, for example, a maximum power point tracking method (MPPT). The operation of the power conversion unit 12 is continuously carried out until the generated power X does not exceed the threshold value α (No in step S21) or the storage amount B1 reaches the threshold value β (Yes in step S22).

  FIG. 3 will be described. FIG. 3 is a flowchart showing a processing procedure of ON / OFF control that the control unit 18 performs on the first relay 15, the second relay 16, and the third relay 17.

  Step S31: It is determined whether the power source of the vehicle is in a power source state capable of traveling by an accelerator operation or in a power source state incapable of traveling. For example, the power supply state of a vehicle capable of traveling by an accelerator operation is a "Ready-ON" state, and the power supply state of a vehicle non-travelable by an accelerator operation is a "Ready-OFF" state. If the power supply of the vehicle is in a driveable power supply state, the process proceeds to step S32. On the other hand, if the power source of the vehicle is in a power source state in which the vehicle can not travel, the process proceeds to step S35.

  Step S32: It is determined whether the engine of the vehicle is idling stopped. If the engine is idling stopped, the process proceeds to step S33. If the engine is not idling stopped, the process proceeds to step S34.

  Step S33: The first relay 15 is turned on, and the first battery 13 and the load 23 are connected. In addition, the second relay 16 is turned off, and the second battery 14 and the load 23 are disconnected. Further, the third relay 17 is turned on, and the first battery 13 and the accessory output terminal 24 are connected.

  In this connection state, power consumption of the load 23 is supplied from the first battery 13 while idling of the engine is stopped, and part of the power consumption of the load 23 is compensated by the generated power X of the solar panel 11 it can. Therefore, the duration of the idling stop can be extended while reducing the power load of the second battery 14, and the fuel consumption is improved. In addition, stable power is supplied to the accessory output terminal 24 from the first battery 13. Furthermore, the starting power of the starter 22 when returning from the idling stop is supplied from the second battery 14.

  Step S34: The first relay 15 is turned on, and the first battery 13 and the load 23 are connected. Further, the second relay 16 is turned on, and the second battery 14 and the load 23 are connected. Further, the third relay 17 is turned on, and the first battery 13 and the accessory output terminal 24 are connected.

  In this connection state, the generated power X generated by the solar panel 11 while the vehicle is traveling can be supplied to the load 23 via the first battery 13. Accordingly, the power supplied from the alternator 21 to the load 23 can be reduced, and the fuel consumption can be improved.

  Step S35: It is determined whether the storage amount B2 of the second battery 14 has reached a predetermined threshold value γ. The threshold value γ can be set, for example, to the lower limit storage amount at which the starter 22 can not be started when the second battery 14 is discharged further. If the storage amount B2 has reached the threshold value γ, it is determined that the starter 22 can not be started, and the process proceeds to step S36. On the other hand, when the storage amount B2 has not reached the threshold value γ (that is, the storage amount B2 is larger than the threshold value γ), it is determined that the starter 22 can be started, and the process proceeds to step S37.

  Step S36: The first relay 15 is turned on, and the first battery 13 and the load 23 are connected. Further, the second relay 16 is turned on, and the second battery 14 and the load 23 are connected. In addition, the third relay 17 is turned off, and the first battery 13 and the accessory output terminal 24 are disconnected.

  In this connection state, the generated power X generated by the solar panel 11 and the power stored in the first battery 13 can be output to the second battery 14 and the starter 22. Therefore, the situation where the second battery 14 reaches the lower limit storage amount and the starter 22 can not be started can be avoided. By separating the accessory output terminal 24 from the first battery 13, unnecessary power consumption can be prevented, and the starter 22 can be easily started.

  Step S37: The first relay 15 is turned off, and the first battery 13 and the load 23 are disconnected. Further, the second relay 16 is turned on, and the second battery 14 and the load 23 are connected. Further, the third relay 17 is turned on, and the first battery 13 and the accessory output terminal 24 are connected.

  In this connection state, the generated power X generated by the solar panel 11 while the vehicle is parked can be output to the first battery 13 for storage. Therefore, it can be suppressed that the generated power X while the vehicle is traveling is wasted. In addition, stable power can be supplied to the accessory output terminal 24 from the first battery 13.

[Effect in the present embodiment]
According to the solar system 10 according to the embodiment of the present invention described above, regardless of whether the vehicle is traveling or parking, the generated power X of the solar panel 11 is output to the first battery 13 to store electricity. can do. Thereby, it can be suppressed that the power generated by the solar panel 11 is wasted while the vehicle is traveling and when the vehicle is stopped.

  Moreover, according to the solar system 10 which concerns on this embodiment, according to the condition of a vehicle, ON / OFF of the 1st relay 15 and the 2nd relay 16 is switched, and load 23 and the 2nd battery of the electric power of the 1st battery 13 By supplying it to 14, it is possible to improve the fuel consumption and to suppress the overdischarge of the second battery 14.

[Application example]
In the solar system 10 according to the present embodiment, the configuration can be easily changed such that power generated by another power generation device can be used besides power generated by the solar panel 11.

  For example, a thermal power generation device capable of generating power by heat such as an exhaust system, and a second power conversion unit capable of converting the power generated by the thermal power generation device into predetermined power and outputting the power to the first battery 13 are added to the system The second power conversion unit is connected to the first battery 13 so as to be chargeable and dischargeable. With this configuration, both of the generated power X of the solar panel 11 and the generated power of the thermal power generation device can be used.

  INDUSTRIAL APPLICABILITY The solar system of the present invention is applicable to a vehicle having an internal combustion engine as a power source without a large capacity battery for storing generated electric power.

DESCRIPTION OF SYMBOLS 10 solar system 11 solar panel 12 power conversion part 13 1st battery 14 2nd battery 15 1st relay 16 2nd relay 17 2nd relay 17 3rd relay 18 control part 21 alternator 22 starter 23 load 24 accessory output terminal

Claims (1)

A solar system mounted on a vehicle,
Solar panels that generate electricity from sunlight,
A first battery that can be charged and discharged,
A second battery that can be charged and discharged,
A power converter for outputting the power generated by the solar panel to the first battery;
A load that consumes power,
A first relay for releasably connecting the first battery and the load;
And a second relay for disconnectably connecting the second battery and the load,
The first relay separates the first battery from the load while the storage amount of the second battery is larger than a predetermined threshold in a power supply state in which vehicle travel is not permitted.
The second relay disconnects the second battery from the load while the engine is idling stopped in a power supply state in which vehicle travel is permitted.
Solar system.

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