In-vehicle backup control device

Abstract

The load of an in-vehicle power supply system during a charging operation can be reduced. An in-vehicle backup control device (10) is provided with: a plurality of charging units (52, 62) for supplying a charging current on the basis of power supplied from a first power supply unit (20); and an adjustment unit (11) that controls the plurality of charging units (52, 62). Each of the charging units (52, 62) performs an operation for supplying a charging current to each of the power storage units (31, 32). The adjustment unit (11) adjusts the charging operation of the plurality of charging units (52, 62) so that the total value of the charging currents to the plurality of power storage units (31, 32) falls within an allowable range.

Description

Technical Field

[0001] The present disclosure relates to a backup control device for vehicle use. Background Art

[0002] Patent Document 1 discloses a power storage device that supplies power to a load from a power storage unit that serves as a backup power source when the voltage of a main power source decreases. The power storage device outputs a charging signal to a charging circuit when the vehicle starts to be used. When the charging circuit receives the charging signal, it charges the power storage unit with power from the main power source.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2009-296808 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the case of increasing the redundancy of the power supply to the load, it is considered to provide a plurality of power storage units as backup power sources in the power storage device such as the one disclosed in Patent Document 1. However, if the same charging current as that supplied to one power storage unit in the past is supplied to each of the plurality of power storage units, the load on the power storage device will increase.

[0008] An object of the present disclosure is to reduce the load on a vehicle-mounted power supply system during charging operation.

[0009] Means for solving problems

[0010] The vehicle-mounted backup control device as one of the present disclosures is used in a vehicle-mounted power supply system having a first power supply unit and a second power supply unit having a plurality of power storage units, and performs a backup operation of outputting power to the load based on power from the second power supply unit at least when power supply from the first power supply unit to the load fails, wherein:

[0011] The vehicle-mounted backup control device comprises:

[0012] a plurality of charging units that supply charging current based on the electric power supplied from the first power supply unit; and

[0013] an adjustment unit, controlling the plurality of charging units,

[0014] Each of the charging units performs an operation of supplying a charging current to each of the power storage units,

[0015] The adjustment unit adjusts charging operations of the plurality of charging units so that a total value of charging currents to the plurality of power storage units falls within an allowable range.

[0016] Effects of the Invention

[0017] The technology disclosed in the present disclosure can reduce the load on the vehicle-mounted power supply system during charging operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a block diagram schematically illustrating an in-vehicle power supply system including the in-vehicle backup control device according to the first embodiment.

[0019] Figure 2 This is a flowchart illustrating the flow of control performed by the vehicle-mounted backup control device according to the first embodiment.

[0020] Figure 3 This is a flowchart illustrating the flow of standby control of the second power supply unit.

[0021] Figure 4 1 is a block diagram schematically illustrating an in-vehicle power supply system including an in-vehicle backup control device according to a second embodiment. DETAILED DESCRIPTION

[0022] The following lists and illustrates the embodiments of the present disclosure. In addition, the features [1] to [3] illustrated below may be combined in any manner within the range of no contradiction.

[0023] [1] A vehicle-mounted backup control device, used in a vehicle-mounted power supply system having a first power supply unit and a second power supply unit having a plurality of power storage units, and performing a backup operation of outputting power to the load based on power from the second power supply unit at least when power supply from the first power supply unit to the load fails, wherein:

[0024] The vehicle-mounted backup control device comprises:

[0025] a plurality of charging units that supply charging current based on the electric power supplied from the first power supply unit; and

[0026] an adjustment unit, controlling the plurality of charging units,

[0027] Each of the charging units performs an operation of supplying a charging current to each of the power storage units,

[0028] The adjustment unit adjusts charging operations of the plurality of charging units so that a total value of charging currents to the plurality of power storage units falls within an allowable range.

[0029] The vehicle-mounted backup control device of [1] above adjusts the charging operations of the plurality of charging units by the adjustment unit so that the total value of the charging current to the plurality of power storage units is within the allowable range, so that the first power supply unit can supply electric power so that the charging current is within the allowable range. Therefore, by appropriately setting the allowable range of the charging current, the load generated in the vehicle-mounted power supply system can be reduced.

[0030] [2] The vehicle-mounted backup control device described in [1] has the following features. The adjustment unit includes an electronic control unit, a plurality of control units, and a plurality of detection units. The electronic control unit communicates with the plurality of control units. Each of the detection units detects the value of the charging current supplied to each of the charging units. Each of the control units controls each of the charging units, and sends charging current information that can determine the value of the charging current detected by each of the detection units to the electronic control unit. The electronic control unit controls the plurality of control units based on the charging current information provided from the plurality of control units so that the total value of the charging current supplied to the plurality of storage units is within an allowable range.

[0031] The vehicle-mounted backup control device of the above-mentioned [2] is a structure in which the electronic control unit controls each control unit, so each control unit can control the charging unit based on the control of the electronic control unit. Therefore, the control of each control unit can be simplified.

[0032] [3] The vehicle-mounted backup control device described in [1] has the following features. The adjustment unit includes a plurality of control units and a plurality of detection units. Each of the detection units detects the value of the charging current supplied to each of the charging units. Each of the control units controls each of the charging units. The plurality of control units communicate with each other and control the plurality of charging units based on the value of the charging current detected by the plurality of detection units so that the total value of the charging current supplied to the plurality of storage units is within an allowable value range.

[0033] In the vehicle-mounted backup control device of the above-mentioned [3], each control unit communicates with each other to control the charging unit, so there is no need to separately provide a control device for centrally controlling each control unit. Therefore, charging control can be completed in each control unit.

[0034] <First Embodiment>

[0035] [Structure of the vehicle power supply system]

[0036] Figure 1 The vehicle-mounted power supply system 100 shown includes a first power supply unit 20, a second power supply unit 30, loads 41 and 42, and a vehicle-mounted backup control device 10. The vehicle-mounted backup control device 10 is also simply referred to as a backup control device 10.

[0037] The first power supply unit 20 functions as a main power supply that continuously supplies power when the vehicle equipped with the vehicle power supply system 100 is started. The first power supply unit 20 is a DC power supply that generates a DC voltage. The first power supply unit 20 is composed of a storage battery such as a lead acid battery, for example. The terminal on the high potential side of the first power supply unit 20 is electrically connected to the power circuit 80, and the terminal on the low potential side of the first power supply unit 20 is electrically connected to the ground line. The first power supply unit 20 applies a predetermined voltage to the power circuit 80. In addition, in this specification, unless otherwise specified, the voltage is a voltage based on the ground.

[0038] The first power supply unit 20 is electrically connected to the loads 41 and 42 via the power path 80. The power from the first power supply unit 20 is supplied to the loads 41 and 42 via the power path 80. Figure 1 In the example of FIG. 1 , the power circuit 80 includes a power circuit 81A which is a conductive circuit directly connected to the first power supply unit 20, a power circuit 81B which is connected to the load 41, and a power circuit 81C which is a conductive circuit connected to the load 42. The power circuits 81A, 81B, and 81C are electrically connected to each other. When power is supplied from the first power supply unit 20 to the loads 41 and 42, the power circuits 81A, 81B, and 81C are set to the same potential. The power circuit 80 is provided with relays, fuses, etc., which are not shown in the figure, and these elements have the function of cutting off the conduction of the power circuit 80.

[0039] The loads 41 and 42 are vehicle-mounted electrical devices. The loads 41 and 42 are loads to which power is expected to be supplied when the power supply from the first power supply unit 20 is in an abnormal state (failure state) in which the power supply is stopped. The loads 41 and 42 may be actuators such as motors, for example. Alternatively, they may be ECUs and actuators in electric parking brake systems, ECUs and actuators in shift-by-wire control systems, etc. Alternatively, they may be vehicle-mounted electrical devices other than these.

[0040] The backup control device 10 includes an adjustment unit 11, a first charge and discharge unit 52, a first voltage detection unit 53, a second charge and discharge unit 62, and a second voltage detection unit 63. The adjustment unit 11 controls the first charge and discharge unit 52 and the second charge unit 62. The adjustment unit 11 includes an electronic control device 12, a first control unit 51, a first current detection unit 54, a second control unit 61, and a second current detection unit 64. The first charge and discharge unit 52 and the second charge and discharge unit 62 are equivalent to an example of a “charger” in the present disclosure. The first control unit 51 and the second control unit 61 are equivalent to an example of a “control unit” in the present disclosure. The first current detection unit 54 and the second current detection unit 64 are equivalent to an example of a “detection unit” in the present disclosure.

[0041] The electronic control device 12 is a control device different from the first control unit 51 and the second control unit 61. The electronic control device 12 is a control device not included in the first storage unit 101 and the second storage unit 102 described later. The electronic control device 12 is configured as an upper ECU (Electronic Control Unit) mounted on the vehicle, for example. The electronic control device 12 can communicate with the first control unit 51 and the second control unit 61. The electronic control device 12 controls the first control unit 51 and the second control unit 61.

[0042] The backup control device 10 is a device that can perform a backup operation to supply power to the loads 41 and 42 based on the power of the second power supply unit 30 (the first power storage unit 31 and the second power storage unit 32) when the power supply from the first power supply unit 20 to the loads 41 and 42 is cut off or reduced in a specified state (abnormal state).

[0043] The vehicle-mounted power supply system 100 includes a first power storage unit 101 and a second power storage unit 102. The first power storage unit 101 includes a first power storage unit 31, a first control unit 51, a first charge and discharge unit 52, a first voltage detection unit 53, and a first current detection unit 54. The second power storage unit 102 includes a second power storage unit 32, a second control unit 61, a second charge and discharge unit 62, a second voltage detection unit 63, and a second current detection unit 64.

[0044] The first power storage unit 31 and the second power storage unit 32 function as auxiliary power supplies. The first power storage unit 31 and the second power storage unit 32 are equivalent to an example of a "power storage unit" in the present disclosure. The first power storage unit 31 and the second power storage unit 32 are DC power supplies that output DC voltage, such as double-layer capacitors. The first power storage unit 31 is electrically connected to the first charge and discharge unit 52 described later via the conductive circuit 55, and is charged and discharged via the first charge and discharge unit 52. The charging voltage (output voltage) of the first power storage unit 31 is the voltage applied by the guide circuit 55. The terminal on the high potential side of the first power storage unit 31 is electrically connected to the conductive circuit 55 and has the same potential as the conductive circuit 55. The terminal on the low potential side of the first power storage unit 31 is electrically connected to the ground wire and has the same potential as the ground wire.

[0045] The second power storage unit 32 is electrically connected to a second charge-discharge unit 62 described later via a conductive circuit 65, and is charged and discharged via the second charge-discharge unit 62. The charging voltage (output voltage) of the second power storage unit 32 is a voltage applied by the guide circuit 65. The terminal on the high potential side of the second power storage unit 32 is electrically connected to the conductive circuit 65 and has the same potential as the conductive circuit 65. The terminal on the low potential side of the second power storage unit 32 is electrically connected to the ground line and has the same potential as the ground line.

[0046] In the backup control device 10, in the stop state where the start switch of the vehicle equipped with the vehicle power supply system 100 is turned off, the charging voltage (output voltage) of the first power storage unit 31 and the second power storage unit 32 is maintained at a standby voltage or less. In addition, the backup control device 10 charges the first power storage unit 31 and the second power storage unit 32 in such a manner that the charging voltage becomes a target voltage greater than the standby voltage in accordance with the switching of the start switch of the vehicle to the on state. When the start switch of the vehicle is in the on state, in the case where no failure state occurs, the charging voltage of the first power storage unit 31 and the second power storage unit 32 is maintained at the target voltage. When the start switch of the vehicle is switched from the on state to the off state, the backup control device 10 discharges the first power storage unit 31 and the second power storage unit 32 until the charging voltage of the first power storage unit 31 and the second power storage unit 32 becomes the standby voltage or less.

[0047] The first charge and discharge unit 52 functions in a manner of supplying a charging current to the first power storage unit 31 based on the power supplied from the first power supply unit 20, and functions in a manner of outputting the power based on the first power storage unit 31 to the load 41. The first charge and discharge unit 52 operates based on the control of the first control unit 51 described later. The first charge and discharge unit 52 is arranged between the conductive path 56 and the conductive path 57. The conductive path 57 is a conductive path between the first charge and discharge unit 52 and the load 41. The first charge and discharge unit 52 has, for example, a voltage conversion circuit such as a DCDC converter. The voltage conversion circuit performs a charging operation and a discharging operation with respect to the first power storage unit 31. As a charging operation, the voltage conversion circuit performs a voltage conversion operation of stepping up or down the voltage applied to the conductive path 56 and applying it to the guide circuit 55. As a discharging operation, the voltage conversion circuit performs a voltage conversion operation of stepping up or down the voltage applied to the conductive path 55 and applying it to the guide circuit 57.

[0048] The second charge and discharge unit 62 functions in a manner of supplying a charging current to the second power storage unit 32 based on the power supplied from the first power supply unit 20, and functions in a manner of outputting the power based on the second power storage unit 32 to the load 42. The second charge and discharge unit 62 operates based on the control of the second control unit 61 described later. The second charge and discharge unit 62 is arranged between the conductive path 66 and the conductive path 67. The conductive path 67 is a conductive path between the second charge and discharge unit 62 and the load 42. The second charge and discharge unit 62 has, for example, a voltage conversion circuit such as a DCDC converter. The voltage conversion circuit performs a charging operation and a discharging operation with respect to the second power storage unit 32. As a charging operation, the voltage conversion circuit performs a voltage conversion operation of stepping up or down the voltage applied to the conductive path 66 and applying it to the guide circuit 65. As a discharging operation, the voltage conversion circuit performs a voltage conversion operation of stepping up or down the voltage applied to the conductive path 65 and applying it to the guide circuit 67.

[0049] The first control unit 51 controls the action of supplying electric power from the first power storage unit 31 to the load 41. The first control unit 51 is an information processing device having information processing functions, calculation functions, control functions, and the like. The first control unit 51 is, for example, mainly composed of a microcomputer, and has a calculation device such as a CPU (Central Processing Unit), a memory such as a ROM (Read Only Memory) or a RAM (Random Access Memory), an A / D converter, and the like. The first control unit 51 has a function of controlling the first charging and discharging unit 52. The first control unit 51 sends charging current information that can determine the value of the charging current detected by the first current detection unit 54 to the electronic control unit 12. The charging current information may be the value of the charging current detected by the first current detection unit 54 itself, or may be a value after the value of the charging current is corrected.

[0050] The second control unit 61 controls the action of supplying electric power from the second power storage unit 32 to the load 42. The second control unit 61 is an information processing device having information processing functions, calculation functions, control functions, and the like. The second control unit 61 is, for example, mainly composed of a microcomputer, and has a calculation device such as a CPU (Central Processing Unit), a memory such as a ROM (Read Only Memory) or a RAM (Random Access Memory), an A / D converter, and the like. The second control unit 61 has a function of controlling the second charge and discharge unit 62. The second control unit 61 sends charging current information that can determine the value of the charging current detected by the second current detection unit 64 to the electronic control unit 12. The charging current information may be the value of the charging current detected by the second current detection unit 64 itself, or may be a value after the value of the charging current is corrected.

[0051] The first voltage detection unit 53 is configured as a voltage detection circuit, for example. The first voltage detection unit 53 detects the voltage of the conductive path 56. The conductive path 56 is electrically connected to the power path 80 and is set to the same potential as the power path 80. Therefore, the first voltage detection unit 53 can detect the voltage of the power path 80.

[0052] The second voltage detection unit 63 is configured as a voltage detection circuit, for example. The second voltage detection unit 63 detects the voltage of the conductive path 66. The conductive path 66 is electrically connected to the power path 80 and is set to the same potential as the power path 80. Therefore, the second voltage detection unit 63 can detect the voltage of the power path 80.

[0053] The first current detection unit 54 is configured as a current detection circuit, for example. The first current detection unit 54 detects the value of the current flowing in the conductive path 56. The first current detection unit 54 detects the value of the charging current supplied to the first charging and discharging unit 52. The current value detected by the first current detection unit 54 is a value (specifically, an analog voltage value) that can identify the current value of the conductive path 56.

[0054] The second current detection unit 64 is configured as a current detection circuit, for example. The second current detection unit 64 detects the value of the current flowing in the conductive path 66. The second current detection unit 64 detects the value of the charging current supplied to the second charging and discharging unit 62. The current value detected by the second current detection unit 64 is a value (specifically, an analog voltage value) that can identify the current value of the conductive path 66.

[0055] [Control of backup control device]

[0056] Figure 2 The control shown is an example of the backup control performed by the backup control device 10 (specifically, the electronic control device 12, the first control unit 51, and the second control unit 61). The backup control device 10 starts when a predetermined start condition is satisfied. Figure 2 Backup control of the . Start Figure 2 The backup control condition of the vehicle may be, for example, the start switch of the vehicle equipped with the vehicle power supply system 100 is switched from the off state to the on state, or other conditions may be used. For example, when the start switch of the vehicle is switched from the off state to the on state, a start signal indicating that the start switch is switched to the on state is input to the electronic control device 12. When the electronic control device 12 receives the start signal, the backup control device 10 starts Figure 2 Backup control.

[0057] The backup control device 10 starts Figure 2 In the case of the standby control, the second power supply unit 30 (the first power storage unit 31 and the second power storage unit 32) is placed in a standby state (step S11). The standby control device 10 charges the first power storage unit 31 and the second power storage unit 32 so that the charging voltage becomes equal to or higher than the target voltage which is greater than the standby voltage. The standby control device 10 maintains the charging voltage of the first power storage unit 31 and the second power storage unit 32 at the target voltage.

[0058] Figure 3The control shown is an example of the specific processing of step S11. The backup control device 10 starts charging the second power supply unit 30 (the first power storage unit 31 and the second power storage unit 32) (step S21). The adjustment unit 11 controls the first charging and discharging unit 52 and the second charging and discharging unit 62. The first charging and discharging unit 52 supplies a charging current to the first power storage unit 31 based on the power supplied from the first power supply unit 20. The second charging and discharging unit 62 supplies a charging current to the second power storage unit 32 based on the power supplied from the first power supply unit 20.

[0059] Next, the backup control device 10 adjusts the charging operation of the first charging and discharging unit 52 and the second charging and discharging unit 62 (step S22). The adjustment unit 11 adjusts the charging operation of the first charging and discharging unit 52 and the second charging and discharging unit 62 so that the total value of the charging current to the first power storage unit 31 and the second power storage unit 32 is within the allowable range. Specifically, the electronic control unit 12 controls the first control unit 51 and the second control unit 61 based on the charging current information provided from the first control unit 51 and the second control unit 61 so that the total value of the charging current to the first power storage unit 31 and the second power storage unit 32 is within the allowable range. The allowable range is a range of current values ​​that is preset, for example, a range that is greater than 0 and is less than the maximum allowable current value in the vehicle-mounted power supply system 100. The upper limit value (allowable threshold value) of the allowable range is, for example, a value smaller than the maximum current value that can flow in a fuse provided in the power circuit 80 or the like. The allowable threshold value is a fixed value, and may also be changeable.

[0060] The charging current information provided from the first control unit 51 is set to the current value (first current value Ia) detected by the first current detection unit 54. The charging current information provided from the second control unit 61 is set to the current value (second current value Ib) detected by the second current detection unit 64. For example, the electronic control unit 12 determines whether the total value of the first current value Ia and the second current value Ib is less than the allowable threshold value Imax. When the electronic control unit 12 determines that Ia+Ib>Imax, the electronic control unit 12 performs feedback control in such a way that the total value of the charging current value I1 supplied by the first charging and discharging unit 52 to the first power storage unit 31 and the charging current value I2 supplied by the second charging and discharging unit 62 to the second power storage unit 32 is less than Imax. For example, the electronic control unit 12 sets I1 and I2 to the same value and controls them to be I1+I2≤Imax. For example, the electronic control unit 12 controls I1 to be Imax / 2, and controls I2 to be Imax / 2. Alternatively, I1 and I2 may be controlled to current values ​​lower than Imax / 2 at ratios corresponding to Ia and Ib, respectively. On the other hand, when the electronic control device 12 determines that Ia+Ib≤Imax, it continues the charging operation of the first and second charging and discharging units 52 and 62 without making adjustments.

[0061] In addition, the electronic control device 12 may also perform feedback control as follows. For example, after the electronic control device 12 starts charging in step S21, it performs constant voltage charging by controlling the first charging and discharging unit 52 and the second charging and discharging unit 62. In this case, it is determined whether the total value of the current value detected by the first current detection unit 54 (the first current value Ic) and the current value detected by the second current detection unit 64 (the second current value Id) is below the allowable threshold value Imax. When the electronic control device 12 determines that Ic+Id>Imax, the electronic control device 12 performs feedback control in such a way that the total value of the charging current value I1 and the charging current value I2 becomes below Imax. For example, the electronic control device 12 sets I1 and I2 to the same value and controls them to be I1+I2≤Imax. For example, the electronic control device 12 controls I1 to Imax / 2 and controls I2 to Imax / 2. In addition, I1 and I2 may also be controlled to current values ​​lower than Imax / 2.

[0062] Next, in step S23, when the backup control device 10 determines that the charging of the second power supply unit 30 (the first power storage unit 31 and the second power storage unit 32) is completed, the backup control device 10 ends the charging process. Figure 3 The backup control device 10 determines that charging is completed when the output voltage of the first power storage unit 31 reaches the target voltage and the output voltage of the second power storage unit 32 reaches the target voltage.

[0063] After the charging of the second power supply unit 30 is completed, the backup control device 10 Figure 2 In step S12, it is determined whether the power supply from the first power supply unit 20 (main power supply) to the loads 41 and 42 is in a failed state. The case where the power supply from the first power supply unit 20 becomes a failed state is, for example, the case where the voltage of the power circuit 80 that supplies power from the first power supply unit 20 becomes less than the threshold voltage. The threshold voltage is, for example, a value that is significantly smaller than the output voltage applied to the power circuit 80 by the first power supply unit 20 in normal conditions, and is a fixed value greater than 0. However, the threshold voltage can also be changed. For example, the first control unit 51 determines whether the voltage of the conductive circuit 56 is less than the threshold value (whether it is in a prescribed falling state) based on the voltage detected by the first voltage detection unit 53. In an abnormal state where the power circuit 80 is grounded, disconnected, etc., and the power supply from the first power supply unit 20 to the conductive circuit 56 is interrupted, the voltage of the conductive circuit 56 becomes about 0V. In addition, the second control unit 61 can also determine whether the voltage of the conductive circuit 66 is less than the threshold value (whether it is in a prescribed falling state) based on the voltage detected by the second voltage detection unit 63.

[0064] In step S12, when the backup control device 10 determines that the power supply from the first power supply unit 20 to the loads 41 and 42 is in a failed state, the process goes to "Yes" and the process of step S13 is performed. On the other hand, in step S12, when the backup control device 10 determines that the power supply from the first power supply unit 20 to the loads 41 and 42 is not in a failed state, the process goes to "No" and the process of step S11 is performed again.

[0065] In step S13, the backup control device 10 starts the backup operation. The backup control device 10 supplies power from the second power supply unit 30 to the loads 41 and 42. When the first control unit 51 supplies power based on the first power storage unit 31 to the load 41, the voltage (voltage of magnitude V1) based on the output voltage of the first power storage unit 31 is applied to the circuit 57. The voltage V1 is a voltage obtained by stepping up or down the output voltage from the first power storage unit 31 by the voltage conversion circuit of the first charge and discharge unit 52. Similarly, when the second control unit 61 supplies power based on the second power storage unit 32 to the load 42, the voltage (voltage of magnitude V2) based on the output voltage of the second power storage unit 32 is applied to the circuit 67. The voltage V2 is a voltage obtained by stepping up or down the output voltage from the second power storage unit 32 by the voltage conversion circuit of the second charge and discharge unit 62.

[0066] If the backup control device 10 determines in the next step S14 that the vehicle equipped with the vehicle power supply system 100 is in a stopped state, the backup control device 10 ends the operation. Figure 2 Specifically, the electronic control device 12 determines whether the start switch of the vehicle equipped with the vehicle power supply system 100 is switched from the on state to the off state. For example, when the start switch of the vehicle is changed from the on state to the off state, a signal indicating that the start switch is switched to the off state is provided to the electronic control device 12.

[0067] The following description relates to an example of the effect of this structure.

[0068] The backup control device 10 of the first embodiment adjusts the charging operation of the first charging and discharging unit 52 and the second charging and discharging unit 62 by the adjustment unit 11 so that the total value of the charging current to the first power storage unit 31 and the second power storage unit 32 is within the allowable range, so that the charging current can be supplied from the first power supply unit (main power supply) 20 so that the charging current is within the allowable range. Therefore, by appropriately setting the allowable range of the charging current, the load generated in the vehicle-mounted power supply system 100 can be reduced.

[0069] The backup control device 10 of the first embodiment is configured such that the electronic control device 12 controls the first control unit 51 and the second control unit 61. Therefore, the first control unit 51 and the second control unit 61 can control the first charge-discharge unit 52 and the second charge-discharge unit 62, respectively, based on the control of the electronic control device 12. Therefore, the control of the first control unit 51 and the second control unit 61 can be simplified.

[0070] <Second Embodiment>

[0071] The vehicle power supply system 200 of the second embodiment is different from the first embodiment in that the electronic control device 12 is not provided and the first control unit 51 and the second control unit 61 can communicate, but is similar in other aspects. The same reference numerals are used for the same structures as those of the first embodiment, and detailed descriptions thereof are omitted.

[0072] like Figure 4 As shown, the vehicle-mounted power supply system 200 includes a first power supply unit 20, a second power supply unit 30, loads 41, 42, and a backup control device 210. The backup control device 210 includes an adjustment unit 211, a first charging and discharging unit 52, a first voltage detection unit 53, a second charging and discharging unit 62, and a second voltage detection unit 63. The adjustment unit 211 includes a first control unit 51, a first current detection unit 54, a second control unit 61, and a second current detection unit 64.

[0073] The first control unit 51 and the second control unit 61 can communicate with each other. The first control unit 51 can send charging current information that can identify the value of the charging current detected by the first current detection unit 54 to the second control unit 61. The second control unit 61 can send charging current information that can identify the value of the charging current detected by the second current detection unit 64 to the first control unit 51.

[0074] [Operation of the backup control device]

[0075] The backup control device 210 of the second embodiment performs the backup control in the same manner as the first embodiment. Figure 2 , Figure 3 The backup control performed by the backup control device 210 (specifically, the first control unit 51 and the second control unit 61) is mainly Figure 3 The charging control shown (step S22 ) is different from that of the first embodiment.

[0076] In step S22, the first control unit 51 and the second control unit 61 adjust the charging operation of the first charging and discharging unit 52 and the second charging and discharging unit 62. The first control unit 51 and the second control unit 61 adjust the charging operation of the first charging and discharging unit 52 and the second charging and discharging unit 62 in such a manner that the total value of the charging current to the first power storage unit 31 and the second power storage unit 32 is within the allowable range. Specifically, the first control unit 51 and the second control unit 61 communicate with each other and control the charging operation of the first charging and discharging unit 52 and the second charging and discharging unit 62 in such a manner that the total value of the charging current to the first power storage unit 31 and the second power storage unit 32 is within the allowable range based on the charging current value detected by the first current detection unit 54 and the charging current value detected by the second current detection unit 64. The allowable range is the same as the allowable range specified in the first embodiment.

[0077] For example, the second control unit 61 controls the charging operation of the first charging and discharging unit 52 and the second charging and discharging unit 62 based on the charging current information (first current value) provided from the first control unit 51. The second control unit 61 controls the first control unit 51 through communication so that the first control unit 51 performs the charging operation of the first charging and discharging unit 52. The feedback control (step S22) performed by the second control unit 61 is the same as the control (feedback control to make the total value of the charging current value I1 and the charging current value I2 equal to or less than Imax) performed by the electronic control unit 12 in step S22 of the first embodiment.

[0078] The following description relates to an example of the effect of this structure.

[0079] The backup control device 10 of the second embodiment is configured such that the first control unit 51 and the second control unit 61 communicate with each other to control the first charging and discharging unit 52 and the second charging and discharging unit 62, so there is no need to separately provide a control device for centrally controlling the first control unit 51 and the second control unit 61. Therefore, the charging control can be performed by the first control unit 51 and the second control unit 61.

[0080] <Other Implementation Methods>

[0081] The present disclosure is not limited to the embodiments described above and illustrated in the drawings. For example, the features of the embodiments described above or later can be combined arbitrarily within the scope of non-contradiction. In addition, any feature of the embodiments described above or later can be omitted if it is not explicitly stated as a necessary feature. In addition, the embodiments described above can also be changed as follows.

[0082] In the above-mentioned first embodiment, the vehicle-mounted power supply system 100 has two power storage units (a first power storage unit 101 and a second power storage unit 102), but it can also have more than three power storage units of the same structure. That is, the second power supply unit 30 can also include more than three power storage units. More than three control units control the corresponding charging and discharging units, and each charging and discharging unit supplies charging current to each power storage unit. The electronic control unit 12 controls each control unit based on the charging current information provided from the more than three control units so that the total value of the charging current to the more than three power storage units is within the allowable range. In the second embodiment, the more than three control units communicate with each other and control each charging unit based on the value of the charging current detected by the corresponding current detection unit so that the total value of the charging current to the corresponding power storage unit is within the allowable value range.

[0083] In the above-mentioned second embodiment, the second control unit 61 controls the charging action of the first charging and discharging unit 52 and the second charging and discharging unit 62 based on the charging current information (first current value) provided from the first control unit 51, but the first control unit 51 may also control the charging action of the first charging and discharging unit 52 and the second charging and discharging unit 62 based on the charging current information (second current value) provided from the second control unit 61.

[0084] In the first and second embodiments, in the backup control of the backup control device 10, in step S12, the state in which the voltage of the conductive circuit 56 is less than the threshold value is exemplified as the predetermined state, but other states may be used. For example, the predetermined state may be a state in which there is a request for a backup action from the load (specifically, a state in which at least one of the first control unit 51 and the second control unit 61 receives a signal requesting a backup action from the load).

[0085] In the first and second embodiments, the start switch of the vehicle is described, but the start switch may be an ignition switch or a power switch for operating an EV system in an electric vehicle or the like.

[0086] In the first and second embodiments, the first power supply unit 20 is a lead acid battery, but is not limited to a lead acid battery. The first power supply unit 20 may be other types of batteries such as a lithium ion battery, or may be a power source such as an alternator or a converter.

[0087] In the first and second embodiments, the first power storage unit 31 and the second power storage unit 32 are electric double layer capacitors, but the power storage unit is not limited to electric double layer capacitors and may be other types of power storage units such as lithium ion capacitors and lithium ion batteries.

[0088] In the first and second embodiments, the backup control device performs the backup operation when the power supply from the power supply unit is interrupted. However, the backup control device may perform the backup operation by supplying power from the power storage unit in a predetermined state where the power supply is not completely interrupted.

[0089] The embodiments disclosed herein are to be considered in all respects as illustrative and non-restrictive. The scope of the present invention is not limited to the embodiments disclosed herein, but is intended to include all modifications within the scope of the claims or within the scope equivalent to the claims.

[0090] Description of Reference Numerals

[0091] 10…Backup control device

[0092] 11…Adjustment Department

[0093] 12…Electronic control unit

[0094] 20…First power supply unit

[0095] 30…Second power supply unit

[0096] 31…First power storage unit (power storage unit)

[0097] 32…Second power storage unit (power storage unit)

[0098] 41, 42…load

[0099] 51…First control unit (control unit)

[0100] 52 ... first charge and discharge unit (charging unit)

[0101] 53 ... first voltage detection unit

[0102] 54 ... first current detection unit (detection unit)

[0103] 55, 56, 57…conductive circuit

[0104] 61…Second control unit (control unit)

[0105] 62…Second charging and discharging section (charging section)

[0106] 63 ... second voltage detection unit

[0107] 64 ... second current detection unit (detection unit)

[0108] 65, 66, 67…conductive circuit

[0109] 80…Dianli Road

[0110] 81A, 81B, 81C…Power Line

[0111] 100…In-vehicle power supply system

[0112] 101 ...first power storage unit

[0113] 102 ... second power storage unit

[0114] 200…In-vehicle power supply system

[0115] 210…Backup control device

[0116] 211…Adjustment Department.

Claims

1. A vehicle-mounted backup control device, used in a vehicle-mounted power supply system having a first power supply unit and a second power supply unit having a plurality of power storage units, and performing a backup operation of outputting power to the load based on power from the second power supply unit at least when power supply from the first power supply unit to the load fails, wherein: The vehicle-mounted backup control device comprises: a plurality of charging units that supply charging current based on the electric power supplied from the first power supply unit; and an adjustment unit, controlling the plurality of charging units, Each of the charging units performs an operation of supplying a charging current to each of the power storage units, The adjustment unit adjusts charging operations of the plurality of charging units so that a total value of charging currents to the plurality of power storage units falls within an allowable range.

2. The vehicle-mounted backup control device according to claim 1, The adjustment unit includes an electronic control device, a plurality of control units and a plurality of detection units. The electronic control device communicates with the plurality of control units. Each of the detection units detects a value of a charging current supplied to each of the charging units, Each of the control units controls each of the charging units, and transmits charging current information capable of identifying the value of the charging current detected by each of the detection units to the electronic control device. The electronic control device controls the plurality of control units based on the charging current information supplied from the plurality of control units so that a total value of the charging currents supplied to the plurality of power storage units falls within an allowable range.

3. The vehicle-mounted backup control device according to claim 1, The adjustment unit includes a plurality of control units and a plurality of detection units. Each of the detection units detects a value of a charging current supplied to each of the charging units, Each of the control units controls each of the charging units respectively. The plurality of control units communicate with each other and control the plurality of charging units based on the values ​​of the charging current detected by the plurality of detection units so that a total value of the charging currents to the plurality of power storage units falls within an allowable value range.

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