Solar control system, method, program, and vehicle

Abstract

To provide a solar control system and the like in which when an abnormality occurs in a DCDC converter (DDC), it can be determined whether the abnormality is caused by the DDC itself or by a sensor for monitoring the output of the DDC.SOLUTION: A solar control system includes a solar unit for outputting power generated by a solar panel, a battery to be supplied with power from the solar unit, a first DDC and a second DDC that are inserted in parallel between the solar unit and the battery and control power to be supplied from the solar unit to the battery based on a command value, sensors for detecting the output current of the first DDC and the output current of the second DDC respectively, and a processor for determining occurrence of sensor abnormality based on the difference value between both the output currents when an abnormality occurs in the system, and determining occurrence of abnormality of at least one of the first DDC and the second DDC based on the total value of both the output currents in a state where a command value for zeroing the output current is indicated.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a solar control system that controls charging of a battery using power generated by a solar panel. [Background technology]

[0002] Patent document 1 discloses a solar control system including two solar panels, two solar DCDC converters corresponding to each solar panel, a high-voltage DCDC converter that supplies the output power of the solar DCDC converter to a high-voltage battery, and an auxiliary DCDC converter that supplies the output power of the solar DCDC converter to an auxiliary battery. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-087291 Summary of the Invention [Problem to be solved by the invention]

[0004] In the system equipped with multiple DCDC converters described in Patent Document 1, when an abnormality occurs in the system, it is possible to identify the DCDC converter in which the abnormality occurs. However, it is not possible to distinguish whether the abnormality is caused by the DCDC converter itself or by a sensor that monitors the input / output of the DCDC converter.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a solar control system, etc., that, when an abnormality occurs in a DCDC converter, can determine whether the abnormality is caused by the DCDC converter itself or by a sensor monitoring the output of the DCDC converter. [Means for solving the problem]

[0006] In order to solve the above problems, one aspect of the disclosed technology is a solar control system comprising: a solar unit that outputs power generated by a solar panel; a battery to which power is supplied from the solar unit; a first DCDC converter and a second DCDC converter that are inserted in parallel between the solar unit and the battery and control the power supplied from the solar unit to the battery based on a command value; sensors that detect a first output current output from the first DCDC converter and a second output current output from the second DCDC converter, respectively; and a processing unit that, when an abnormality occurs in the system, determines whether or not an abnormality has occurred in the sensor based on a difference value between the first output current and the second output current, and determines whether or not an abnormality has occurred in at least one of the first DCDC converter and the second DCDC converter based on a sum value of the first output current and the second output current in a state in which a command value to set the output current to zero is instructed. Effect of the Invention

[0007] According to the solar control system disclosed herein, when an abnormality occurs in the DCDC converter, it is possible to determine whether the abnormality is caused by the DCDC converter itself or by a sensor monitoring the output of the DCDC converter. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic configuration diagram of a solar control system according to an embodiment of the present invention; [Diagram 2] Detailed circuit example of auxiliary DDC [Diagram 3] Flowchart of a first abnormality detection process executed by a solar control system [Figure 4] Flowchart of second abnormality detection process executed by the solar control system [Diagram 5] A flowchart of a modified example of the second abnormality detection process executed by the solar control system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The solar control system according to the present disclosure has an auxiliary DCDC converter configured with two converter circuits connected in parallel, and determines whether an abnormality has occurred in the auxiliary DCDC converter itself or in the output sensor of the auxiliary DCDC converter based on the differential value of the currents flowing through the two converter circuits and the total value of the currents flowing through the two converter circuits. Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the drawings.

[0010] <Embodiment> [composition] Fig. 1 is a block diagram showing a schematic configuration of a solar control system according to an embodiment of the present disclosure. The solar control system 1 illustrated in Fig. 1 includes two solar panels 11 and 12, two solar DDCs 21 and 22, a high-voltage DDC 30, an auxiliary DDC 40, a high-voltage battery 50, an auxiliary battery 60, a capacitor 70, and a processing unit 100. This solar control system 1 can be mounted on a vehicle or the like.

[0011] The solar panels 11 and 12 are power generating devices that generate power by receiving irradiation of sunlight, and are typically solar cell modules that are an assembly of solar cell cells. The solar panels 11 and 12 can be installed, for example, on the roof of a vehicle. One solar panel 11 is connected to one solar DDC 21 described later, and the power generated by the solar panel 11 is output to the solar DDC 21. The other solar panel 12 is connected to the other solar DDC 22 described later, and the power generated by the solar panel 12 is output to the solar DDC 22. The solar panels 11 and 12 may all be the same in performance, capacity, size, shape, etc., or may be partially or entirely different.

[0012] The solar DDCs 21 and 22 are DCDC converters provided corresponding to the solar panels 11 and 12, and supply the electric power generated by the solar panels 11 and 12, respectively, to the high voltage DDC 30 and the auxiliary DDC 40. When supplying electric power, the solar DDC 21 can convert (boost / step down) the generated voltage of the solar panel 11, which is the input voltage, to a predetermined voltage and output it to the high voltage DDC 30 and the auxiliary DDC 40. When supplying electric power, the solar DDC 22 can convert (boost / step down) the generated voltage of the solar panel 12, which is the input voltage, to a predetermined voltage and output it to the high voltage DDC 30 and the auxiliary DDC 40. The configurations and performances of the solar DDCs 21 and 22 may be the same or may be different depending on the solar panels 11 and 12.

[0013] The above-mentioned solar panels 11 and 12, and solar DDCs 21 and 22, constitute one solar unit with the solar panel 11 and the solar DDC 21, and constitute one solar unit with the solar panel 12 and the solar DDC 22. In the solar control system 1 of the present embodiment, a configuration in which these two solar units are provided in parallel is described as an example, but the solar control system may be configured with only one solar unit, or may be configured with three or more solar units provided in parallel.

[0014] The high-voltage DDC 30 is a DC-DC converter that supplies the power output by the solar DDCs 21 and 22 to the high-voltage battery 50. When supplying power, the high-voltage DDC 30 can convert (boost) the output voltage of the solar DDCs 21 and 22, which is the input voltage, to a predetermined voltage and output it to the high-voltage battery 50.

[0015] The auxiliary DDC 40 is a DCDC converter that supplies the power output by the solar DDCs 21 and 22 to the auxiliary battery 60. When supplying power, the auxiliary DDC 40 can convert (step down) the output voltage of the solar DDCs 21 and 22, which is the input voltage, to a predetermined voltage and output it to the auxiliary battery 60. The auxiliary DDC 40 of this embodiment is configured by connecting two identical converter circuits (first DDC, second DDC) in parallel (two-phase configuration) in order to increase the outputtable power capacity.

[0016] 2 shows an example of a detailed circuit of the auxiliary DDC 40 configured by connecting two identical DCDC converters in parallel. The auxiliary DDC 40 shown in FIG. 2 includes a first DDC 41, a second DDC 42, an output voltage sensor 43, a first output current sensor 44, and a second output current sensor 45.

[0017] The first DDC 41 is a DCDC converter including a switching element M11, a switching element M12, an inductor L1, and a drive circuit D1. The first DDC 41 controls the ON / OFF operation of the switching elements M11 and M12 by the drive circuit D1 based on an output current command value received from a DDC control unit (not shown). The second DDC 42 is a DCDC converter including a switching element M21, a switching element M22, an inductor L2, and a drive circuit D2. The second DDC 42 controls the ON / OFF operation of the switching elements M21 and M22 by the drive circuit D2 based on an output current command value received from a DDC control unit (not shown). The first DDC 41 and the second DDC 42 are connected in parallel. The output voltage sensor 43 is a sensor that monitors and detects the voltage on the output side (auxiliary battery 60 side) of the auxiliary DDC 40. The first output current sensor 44 is a sensor that monitors and detects the current output from the first DDC 41 to the output side (auxiliary battery 60 side). The second output current sensor 45 is a sensor that monitors and detects the current output from the second DDC 42 to the output side (auxiliary battery 60 side). The values ​​of the output voltage and output current detected by these sensors are output to the processing unit 100.

[0018] The auxiliary DDC 40 may be provided with a sensor that detects the current input from the solar DDCs 21 and 22 to the auxiliary DDC 40, and a sensor that detects the voltage on the input side of the auxiliary DDC 40. In addition, some or all of the output voltage sensor 43, the first output current sensor 44, and the second output current sensor 45 may be provided as components of the solar control system 1 other than the auxiliary DDC 40.

[0019] The high-voltage battery 50 is a secondary battery configured to be chargeable and dischargeable, such as a lithium-ion battery or a nickel-metal hydride battery. The high-voltage battery 50 is connected to the high-voltage DDC 30 so as to be chargeable by the power output by the high-voltage DDC 30. An example of the high-voltage battery 50 mounted on a vehicle is a so-called drive battery that can supply power required for the operation of main equipment (not shown) for driving the vehicle, such as a starter motor or an electric motor.

[0020] The auxiliary battery 60 is a secondary battery configured to be chargeable and dischargeable, such as a lithium ion battery or a lead storage battery. The auxiliary battery 60 is connected to the auxiliary DDC 40 so as to be chargeable by the power output by the auxiliary DDC 40. The auxiliary battery 60 mounted on the vehicle is a battery that can supply power required for the operation of auxiliary devices (not shown) other than those for driving the vehicle, such as lighting devices such as headlamps and interior lights, air conditioners such as heaters and coolers, and devices for automatic driving and advanced driving assistance.

[0021] The capacitor 70 is connected between the solar DDCs 21 and 22 and the high voltage DDC 30 and the auxiliary DDC 40. This capacitor 70 is a large-capacitance element used for charging and discharging the power generated by the solar panels 11 and 12 as necessary, and for stabilizing the voltage generated between the output of the solar DDCs 21 and 22 and the input of the high voltage DDC 30 and the auxiliary DDC 40. Note that this capacitor 70 may be omitted from the configuration of the solar control system 1.

[0022] The processing unit 100 acquires at least the output current of the first DDC 41 and the output current of the second DDC 42 among the output voltages and output currents detected by the auxiliary DDC 40. The processing unit 100 can also monitor an output current command value instructed to the auxiliary DDC 40. Then, when an abnormality occurs in the auxiliary DDC 40, the processing unit 100 distinguishes and judges whether an abnormality occurs in the auxiliary DDC 40 itself or in a sensor (the first output current sensor 44 or the second output current sensor 45) of the auxiliary DDC 40 based on the two output current values ​​and the output current command value acquired from the auxiliary DDC 40.

[0023] In addition, the solar DDCs 21 and 22, the high voltage DDC 30, the auxiliary DDC 40, and some or all of the processing unit 100 can be configured as an electronic control unit (ECU) that typically includes a processor, a memory, an input / output interface, etc. This electronic control unit can perform the various controls described above by having the processor read and execute a program stored in the memory.

[0024] [control] Next, with further reference to Fig. 3 to Fig. 5, an abnormality detection process executed by the solar control system 1 when an abnormality occurs in the auxiliary DDC 40 will be described. This abnormality detection process includes a first abnormality detection process for detecting a sensor (the first output current sensor 44 or the second output current sensor 45) stuck at High, and a second abnormality detection process for detecting an excessive output by the first DDC 41 or the second DDC 42. The first abnormality detection process and the second abnormality detection process are executed in parallel.

[0025] (1) First abnormality detection process Fig. 3 is a flow chart for explaining the procedure of the first abnormality detection process executed by the processing unit 100 of the solar control system 1. The first abnormality detection process illustrated in Fig. 3 is started, for example, when the ignition of the vehicle is turned on, and is repeatedly performed at a predetermined cycle (for example, every 8 ms) until the cause of the abnormality is determined and the process ends. At the start of the process, the count value of a first determination counter, which will be described later, is reset.

[0026] (Step S301) The processing unit 100 judges whether or not another abnormality has been confirmed in the solar control system 1. The other abnormality is an abnormality other than the High fixation of the sensor to be detected in this first abnormality detection process, and may include, for example, an abnormality of the solar DDC 21 or an abnormality of the high voltage DDC 30. It is considered that an accurate result or a highly reliable result cannot be obtained even if the first abnormality detection process is performed when another abnormality has already been confirmed. Therefore, if the other abnormality has been confirmed (step S301, Yes), this first abnormality detection process ends. On the other hand, if the other abnormality has not been confirmed (step S301, No), the process proceeds to step S302.

[0027] (Step S302) The processing unit 100 calculates the current deviation between the two phases. The current deviation between the two phases is a difference value between the current output from the first DDC 41 and the current output from the second DDC 42 of the auxiliary DDC 40. The processing unit 100 acquires the current value detected by the first output current sensor 44 and the current value detected by the second output current sensor 45 from the auxiliary DDC 40, and calculates the difference between these values ​​to calculate a current difference value (current deviation). After the current deviation between the two phases is calculated, the process proceeds to step S303.

[0028] (Step S303) The processing unit 100 judges whether the current deviation between the two phases is abnormal. This judgment is performed based on whether the absolute value of the current difference value between the first DDC 41 and the second DDC 42 of the auxiliary DDC 40 exceeds a predetermined first reference value. The condition for abnormality detection can be expressed by the formula [|output current value of the first DDC 41-output current value of the second DDC 42|>first reference value]. The first reference value can be set to a predetermined value based on a current difference value that is allowed when both the first DDC 41 and the second DDC 42 are operating normally, taking into consideration the variations and performance of the switching elements, inductors, and each output current sensor. If the current deviation between the two phases is abnormal (step S303, Yes), the process proceeds to step S304. On the other hand, if the current deviation between the two phases is normal (step S303, No), the process proceeds to step S305.

[0029] (Step S304) The processing unit 100 increments the value of the first determination counter by one and counts up. The first determination counter is a counter for realizing highly reliable determination of an abnormality in the current deviation between two phases, and is used to measure the time during which the abnormal state of the current deviation between two phases continues. This first determination counter is typically provided in the processing unit 100. When the value of the first determination counter is counted up, the process proceeds to step S306.

[0030] (Step S305) The processing unit 100 resets the value of the first determination counter to zero. This resetting signifies that the abnormal state of the current deviation between the two phases that has continued since its occurrence has ended. When the value of the first determination counter is reset, the process proceeds to step S306.

[0031] (Step S306) The processing unit 100 judges whether the value of the first judgment counter exceeds the first threshold value. This judgment is made to determine the abnormality of the current deviation between two phases with high reliability. Therefore, the first threshold value, which corresponds to the time required from the occurrence of the abnormality to the determination of the abnormality, is set to an arbitrary value (count value or time) that can ensure high reliability based on the specifications and performance of the first DDC 41 and the second DDC 42. If the value of the first judgment counter exceeds the first threshold value (step S306, Yes), the process proceeds to step S308. On the other hand, if the value of the first judgment counter does not exceed the first threshold value (step S306, No), the process proceeds to step S307.

[0032] (Step S307) The processing unit 100 judges whether or not a predetermined period for performing the processing has arrived so as to repeatedly perform the processing from step S301 to step S306 at a fixed period. The predetermined period can be set arbitrarily based on the performance required for the vehicle and the durability of the parts / elements used in the solar control system 1. If the period has arrived (step S307, Yes), the processing proceeds to step S301.

[0033] (Step S308) The processing unit 100 determines, based on the abnormality in the current deviation between the two phases, that the sensor is constantly outputting the maximum value as the detection value, i.e., that the sensor is stuck at high level. When the sensor is found to be stuck at high level, the first abnormality detection process ends.

[0034] (2) Second abnormality detection process Fig. 4 is a flow chart for explaining the procedure of the second abnormality detection process executed by the processing unit 100 of the solar control system 1. The second abnormality detection process illustrated in Fig. 4 is started, for example, when the vehicle ignition is turned on, similarly to the first abnormality detection process, and is repeatedly performed at a predetermined cycle (for example, 8 ms) until the cause of the abnormality is determined and the process ends. At the start of the process, the count value of a second determination counter, which will be described later, is reset.

[0035] (Step S401) The processing unit 100 judges whether or not another abnormality has been confirmed in the solar control system 1. The other abnormality is an abnormality other than the excessive output by the first DDC 41 or the second DDC 42 to be detected in this second abnormality detection process, and may include, for example, an abnormality of the solar DDC 21 or an abnormality of the high voltage DDC 30. It is considered that even if the second abnormality detection process is performed when the other abnormality has already been confirmed, an accurate result or a highly reliable result cannot be obtained. Therefore, if the other abnormality has been confirmed (step S401, Yes), this second abnormality detection process ends. On the other hand, if the other abnormality has not been confirmed (step S401, No), the process proceeds to step S402.

[0036] (Step S402) The processing unit 100 calculates the total current of the two phases. The total current of the two phases is the total value of the current output from the first DDC 41 and the current output from the second DDC 42 of the auxiliary DDC 40 in a state in which a command value for setting the output current to zero is given to each of the drive circuits D1 and D2 from a DDC control unit (not shown). The processing unit 100 acquires the current value detected by the first output current sensor 44 and the current value detected by the second output current sensor 45 from the auxiliary DDC 40, and adds these values ​​to calculate the total current value. After the total current between the two phases is calculated, the process proceeds to step S403.

[0037] (Step S403) The processing unit 100 judges whether the total current of the two phases is abnormal. This judgment is made based on whether the total current value of the first DDC 41 and the second DDC 42 of the auxiliary DDC 40 exceeds a predetermined second reference value when the output current command value is zero. The condition for abnormality detection can be expressed by the formula [|output current value of the first DDC 41+output current value of the second DDC 42|>second reference value and output current command value=0]. The second reference value can be set to a predetermined value based on the fact that no current flows when a command value is issued to the first DDC 41 and the second DDC 42 that are operating normally to set the output current to zero. If the total current of the two phases is abnormal (step S403, Yes), the process proceeds to step S404. On the other hand, if the total current of the two phases is normal (step S403, No), the process proceeds to step S405.

[0038] (Step S404) The processing unit 100 increments the value of the second determination counter by one and counts up. The second determination counter is a counter for realizing highly reliable determination of an abnormality in the total current of the two phases, and is used to measure the time during which the abnormal state of the total current of the two phases continues. This second determination counter is typically provided in the processing unit 100. When the value of the second determination counter is counted up, the process proceeds to step S406.

[0039] (Step S405) The processing unit 100 resets the value of the second determination counter to zero. This resetting signifies that the abnormal state of the total current of the two phases that has continued since the occurrence has ended. When the value of the second determination counter is reset, the process proceeds to step S406.

[0040] (Step S406) The processing unit 100 judges whether the value of the second judgment counter exceeds the second threshold value. This judgment is made to determine the abnormality of the total current of the two phases with high reliability. Therefore, the second threshold value is set to an arbitrary value (count value, time) that can guarantee high reliability based on the specifications and performance of the first DDC 41 and the second DDC 42. In this embodiment, in order to eliminate the High fixation of the sensor and detect the abnormality of the excessive output by the first DDC 41 or the second DDC 42 with high accuracy, the timing of the processing is controlled so that the abnormality determination by the second abnormality detection processing is performed after the abnormality determination by the first abnormality detection processing is completed. Therefore, the second threshold value corresponding to the time required from the occurrence of the abnormality to the abnormality determination is set to be larger than the above-mentioned first threshold value, that is, the time is set to be longer (first threshold value<second threshold value). By first determining the abnormality by the first abnormality detection processing while the second abnormality detection processing is being performed, the above step S401 is judged to be "Yes", and the abnormality detection by the second abnormality detection processing can be terminated. If the value of the second determination counter exceeds the second threshold (step S406, YES), the process proceeds to step S408. On the other hand, if the value of the second determination counter does not exceed the second threshold (step S406, NO), the process proceeds to step S407.

[0041] (Step S407) The processing unit 100 judges whether a predetermined period for performing the processing has arrived so as to repeatedly perform the processing from step S401 to step S406 at a fixed period. The predetermined period can be set arbitrarily based on the performance required for the vehicle and the durability of the parts / elements used in the solar control system 1. This period can be the same for the first abnormality detection processing and the second abnormality detection processing. If the period has arrived (step S407, Yes), the processing proceeds to step S401.

[0042] (Step S408) The processing unit 100 determines, based on the abnormality in the total current of the two phases, an abnormality in excessive output by the first DDC 41 and the second DDC 42 of the auxiliary DDC 40. When an excessive output abnormality in the auxiliary DDC 40 is determined, this second abnormality detection process ends.

[0043] In this manner, by performing the first abnormality detection process in steps S301 to S308 and the second abnormality detection process in steps S401 to S408, it is possible to distinguish and determine whether an abnormality occurring in the auxiliary DDC40 in which the DCDC converters are configured in parallel is an abnormality due to the sensor being stuck at High or an abnormality due to excessive output by the first DDC41 and the second DDC42.

[0044] (3) Modification of the second abnormality detection process Fig. 5 is a flowchart explaining the procedure of a modified example of the second abnormality detection process executed by the processing unit 100 of the solar control system 1. The modified example of the second abnormality detection process shown in Fig. 5 controls the timing of the process so that a definitive determination of an abnormality is made by the second abnormality detection process after the definitive determination of an abnormality by the first abnormality detection process is completed, without using a second threshold value that is longer than the first threshold value.

[0045] The second abnormality detection process of the modified example shown in Fig. 5 differs from the second abnormality detection process shown in Fig. 4 in that step S501 is added between step S401 and step S402, and step S406 is replaced with step S502. The second abnormality detection process of the modified example will be described below, focusing on these different steps and omitting some explanations of the same processes.

[0046] (Step S401) The processing unit 100 judges whether or not another abnormality has been confirmed in the solar control system 1. If another abnormality has been confirmed (step S401, Yes), the process proceeds to step S501. On the other hand, if another abnormality has not been confirmed (step S401, No), the second abnormality detection process ends.

[0047] (Step S501) The processing unit 100 judges whether the output current command value instructed to the auxiliary DDC40 is stable within a predetermined range for a predetermined time or more. In normal control of the DCDC converter, the output current command value is stable within a predetermined range, but immediately after an abnormality occurs, the output current command value changes significantly in an attempt to return the current value to its original state. Therefore, the second judgment counter is reset (step S405 below) after waiting for a predetermined time after detecting a change in the output current command value, that is, after the count-up of the first judgment counter is started in the first abnormality detection process, that is, after the count-up of the second abnormality detection process is started, the timing of the processing can be controlled so that the determination of the abnormality by the second abnormality detection process is made after the determination of the abnormality by the first abnormality detection process is completed. The predetermined time can be set to an arbitrary value according to the time to shift the timing of the two processes. If the output current command value is stable for a predetermined time or more (step S501, Yes), the processing proceeds to step S402. On the other hand, if the output current command value is not stable for a predetermined time or more (step S501, No), the processing proceeds to step S405.

[0048] (Step S404) The processing unit 100 counts up the value of the second determination counter by incrementing the value by 1. When the value of the second determination counter is counted up, the process proceeds to step S502.

[0049] (Step S405) The processing unit 100 resets the value of the second determination counter to 0. When the value of the second determination counter is reset, the process proceeds to step S502.

[0050] (Step S502) The processing unit 100 judges whether the value of the second judgment counter exceeds the first threshold value. This judgment is made to determine the abnormality of the total current of the two phases with high reliability. In the above step S501, since the processing is carried out after it is confirmed that the output current command value of the auxiliary DDC 40 is stable for a predetermined time or more, even if the same first threshold value as the first abnormality detection processing is used as a judgment criterion, the timing of the processing can be controlled so that the abnormality determination by the second abnormality detection processing is performed after the abnormality determination by the first abnormality detection processing is completed. If the value of the second judgment counter exceeds the first threshold value (step S502, Yes), the processing proceeds to step S408. On the other hand, if the value of the second judgment counter does not exceed the first threshold value (step S502, No), the processing proceeds to step S407.

[0051] (Step S407) The processing unit 100 judges whether or not a predetermined period for performing the processes from step S401 to step S502 has arrived in order to repeatedly perform the processes at a constant period. If the period has arrived (step S407, Yes), the process proceeds to step S401.

[0052] In this way, by performing the above-mentioned first abnormality detection process and this second abnormality detection process after confirming that the stable state of the output current command value continues for a predetermined time when an abnormality occurs, it is possible to distinguish and determine whether an abnormality that has occurred in the auxiliary DDC40 in which the DCDC converters are configured in parallel is an abnormality due to the sensor being stuck at High or an abnormality due to excessive output by the first DDC41 and the second DDC42, while using the same first threshold value.

[0053] <Actions and Effects> As described above, according to the solar control system 1 according to an embodiment of the present disclosure, the auxiliary DDC 40 is configured in parallel with the first DDC 41 and the second DDC 42. As a result, when an abnormality occurs in the auxiliary DDC 40, it is possible to distinguish and determine whether an abnormality occurs in the auxiliary DDC 40 itself (excessive output from the DDC) or an abnormality occurs in the output current sensor 44 or 45 of the auxiliary DDC 40 (sensor stuck at High) based on the current deviation, which is the difference between the output current of the first DDC 41 and the output current of the second DDC 42, and the sum of the output current of the first DDC 41 and the output current of the second DDC 42 according to the command value for making the output current zero, without detecting the current on the input side of the auxiliary DDC 40.

[0054] In the above embodiment, an example has been described in which the auxiliary DDC 40 has a two-parallel configuration with the first DDC 41 and the second DDC 42. However, the auxiliary DDC 40 may have a configuration in which three or more DCDC converters are connected in parallel. In the case of a configuration in which three or more DCDC converters are connected in parallel, it is possible to identify the sensor that is stuck at high by providing an output current sensor for each phase and determining the current deviation between the DCDC converters of each of the two phases.

[0055] The above describes one embodiment of the disclosed technology, but the present disclosure can be understood as not only a solar control system, but also a method performed by a solar control system, a program for that method, a computer-readable non-transitory storage medium storing the program, a vehicle equipped with a solar control system, and the like. [Industrial Applicability]

[0056] The solar control system of the present disclosure can be used in vehicles that charge their batteries using power generated by solar panels. [Explanation of symbols]

[0057] 1. Solar Control System 11, 12 Solar panels 21, 22 Solar DDC 30 High Voltage DDC 40 Auxiliary DDC 41 1st DDC 42 2nd DDC 43 Output voltage sensor 44 First output current sensor 45 Second output current sensor 50 High Voltage Battery 60 Auxiliary battery 70 Capacitor 100 Processing section M11, M12, M21, M22 switching elements L1, L2 inductors D1, D2 drive circuit

Claims

1. A solar unit that outputs electricity generated by a solar panel; a battery powered by the solar unit; A first DC-DC converter and a second DC-DC converter are inserted in parallel between the solar unit and the battery and control the power supplied from the solar unit to the battery based on a command value; a sensor for detecting a first output current output from the first DC-DC converter and a second output current output from the second DC-DC converter; a processing unit that, when an abnormality occurs in the system, determines whether or not an abnormality has occurred in the sensor based on a difference value between the first output current and the second output current, A solar control system in which, when an abnormality occurs in the system, the processing unit determines whether an abnormality has occurred in at least one of the first DC-DC converter and the second DC-DC converter based on the sum of the first output current and the second output current when the command value is instructed to set the output current to zero.

2. The solar control system of claim 1, wherein the processing unit performs a determination based on a sum value of the first output current and the second output current after a determination based on a difference value between the first output current and the second output current.

3. The solar control system of claim 1 or 2, wherein the processing unit determines that the sensor is in an abnormal state in which it always detects a maximum value when the difference value between the first output current and the second output current exceeds a first threshold value.

4. The solar control system of claim 1 or 2, wherein the processing unit determines that at least one of the first DC-DC converter and the second DC-DC converter is in an abnormal state outputting an excessive current that does not comply with the command value when the sum of the first output current and the second output current exceeds a second threshold value.

5. A solar unit that outputs electricity generated by a solar panel; a battery powered by the solar unit; A first DC-DC converter and a second DC-DC converter are inserted in parallel between the solar unit and the battery and control the power supplied from the solar unit to the battery based on a command value; A method performed by a solar control system comprising: a sensor for detecting a first output current output from the first DC-DC converter and a second output current output from the second DC-DC converter, when an abnormality occurs in the system, determining whether or not an abnormality has occurred in the sensor based on a difference value between the first output current and the second output current; and when an abnormality occurs in the system, determining whether or not an abnormality has occurred in at least one of the first DC-DC converter and the second DC-DC converter based on the sum of the first output current and the second output current in a state in which the command value for setting the output current to zero is instructed.

6. A solar unit that outputs electricity generated by a solar panel; a battery powered by the solar unit; A first DC-DC converter and a second DC-DC converter are inserted in parallel between the solar unit and the battery and control the power supplied from the solar unit to the battery based on a command value; A program executed by a computer of a solar control system including: a sensor for detecting a first output current output from the first DC-DC converter and a second output current output from the second DC-DC converter, when an abnormality occurs in the system, determining whether or not an abnormality has occurred in the sensor based on a difference value between the first output current and the second output current; and when an abnormality occurs in the system, determining whether or not an abnormality has occurred in at least one of the first DC-DC converter and the second DC-DC converter based on a sum of the first output current and the second output current in a state in which the command value for setting the output current to zero is instructed.

7. A vehicle equipped with the solar control system according to any one of claims 1 to 4.

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