JP2010081672A - Electric vehicle and method of controlling energy storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric vehicle that suitably controls a remaining capacity or a voltage of an energy storage device, and a method of controlling the energy storage device. <P>SOLUTION: A battery is continued to be discharged until the remaining capacity SOC[%] of the battery 62 reaches a first limit threshold TH_SOC1 (upper limit threshold that suppresses the deterioration of the battery 62 even if the remaining capacity SOC is continuously maintained) after the stop of the operation of the electric vehicle 10. By this, the remaining capacity SOC of the battery 62 can be controlled by another method different from that at the stop of the operation during the operation of the electric vehicle 10, and the remaining capacity SOC of the battery 62 can further suitably be controlled. As a result, during the operation of the electric vehicle 10, more favorable operation performance can be exhibited by adding a limit different from that at the stop of the operation to the remaining capacity SOC of the battery 62. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric vehicle having a power generation device and a power storage device, and a method for controlling the power storage device. More specifically, the present invention relates to an electric vehicle capable of controlling the remaining capacity or voltage of the power storage device and a method for controlling the power storage device.

  There is known an electric vehicle that obtains driving force by supplying electric power from a power storage device to a traveling motor. Among such electric vehicles, there is one that suppresses deterioration of a power storage device by cooling the power storage device (Patent Document 1). Patent Document 1 intends to suppress deterioration of the power storage device by controlling the remaining capacity of the power storage device according to the temperature of the power storage device.

JP 2007-049771 A

  In the electric vehicle described in Patent Document 1, the remaining capacity of the power storage device is controlled from the viewpoint of suppressing deterioration, but the remaining capacity control (or the voltage of the power storage device corresponding to the remaining capacity) is still improved. There is room for.

  The present invention has been made in consideration of such problems, and an object thereof is to provide an electric vehicle and a method for controlling a power storage device that can more suitably control the remaining capacity or voltage of the power storage device. .

  An electric vehicle according to the present invention includes a drive motor, a power generation device that supplies power to the drive motor, and a power storage that is connected to the drive motor in parallel with the power generation device and that can store the generated power of the power generation device. Apparatus, a detection unit that detects a remaining capacity or voltage of the power storage device, and a control unit that controls the remaining capacity or voltage of the power storage device, wherein the control unit is configured to operate the electric vehicle. When stopped, the power storage device is discharged until the remaining capacity or voltage of the power storage device reaches a charge upper limit threshold for stop, and the charge upper limit threshold for stop is a start to ensure the next start of the electric vehicle It is set to be equal to or higher than a securing lower limit threshold value and lower than a continuous degradation suppression upper limit threshold value that can suppress degradation of the power storage device even when the remaining capacity or voltage is continuously maintained.

  According to the present invention, when the operation of the electric vehicle is stopped, the remaining capacity or voltage of the power storage device is set to be equal to or higher than the start ensuring lower limit threshold for ensuring the next start of the electric vehicle. The next start-up can be performed reliably. In addition, when the operation of the electric vehicle is stopped, the remaining capacity or voltage of the power storage device is a continuous deterioration suppression upper limit capable of suppressing deterioration of the power storage device even if the remaining capacity or voltage is continuously maintained. Since it is set to be equal to or less than the threshold value, deterioration of the power storage device when the electric vehicle is stopped can be suppressed. Further, after the electric vehicle is stopped, the electric storage device is discharged until the stop charging upper limit threshold (a value set to be equal to or higher than the start securing lower limit threshold and lower than the continuous deterioration suppression upper limit threshold). The remaining capacity or voltage of the power storage device can be controlled by a method different from that at the time of shutdown, and the remaining capacity or voltage of the power storage device can be controlled more suitably. As a result, when driving an electric vehicle, it is possible to exhibit better driving performance without limiting the remaining capacity or voltage of the power storage device or by applying a limitation different from that when the operation is stopped.

  The electric vehicle further includes at least one of an auxiliary machine and a low-voltage battery, and the control unit sets an operation charge target value that is not less than the start ensuring lower limit threshold and not more than the stop charge upper limit threshold, During the operation of the electric vehicle, the average value, median value, peak value, or mode value of the remaining capacity or voltage of the power storage device for a predetermined travel period or a predetermined travel distance exceeds the target charge value during operation, Allowing power supply from the power storage device to at least one of the drive motor, the auxiliary device, and the low-voltage battery, and the average value, the median value, the peak value, or the mode value is the charging target during operation When the value is lower than the value, power supply from the power storage device to at least one of the drive motor, the auxiliary machine, and the low-voltage battery may be restricted.

  Alternatively, the electric vehicle further includes at least one of an auxiliary machine and a low voltage battery, and the control unit sets an operation charge target value that is not less than the start ensuring lower limit threshold and not more than the stop charge upper limit threshold. When the current value of the remaining capacity or voltage of the power storage device exceeds the driving charge target value during operation of the electric vehicle, the drive motor, the auxiliary device, and the low-voltage battery are connected from the power storage device. When power supply to at least one is permitted and the current value is lower than the operation charge target value, power supply from the power storage device to at least one of the drive motor, the auxiliary device, and the low-voltage battery May be restricted.

  The power storage device is capable of storing the regenerative power of the drive motor, and the control unit is greater than the stop-time charging upper limit threshold during operation of the electric vehicle, and if temporarily, the power storage device You may permit charge of the said electrical storage apparatus to the charge threshold value at the time of a driving | running | working upper limit threshold value set to below the temporary deterioration suppression upper limit threshold value which deterioration does not produce or deterioration is slight.

  The electric vehicle may further include an outside air temperature sensor that detects an outside air temperature of the electric vehicle, and the control unit may set the stop charging upper limit threshold higher as the outside air temperature is lower.

  When the operation of the electric vehicle is stopped, the control unit supplies power from the power storage device to at least one of the auxiliary machine and the low-voltage battery, so that the remaining capacity or voltage of the power storage device is The power storage device may be discharged until a charging upper limit threshold is reached.

  The electric vehicle further includes a downverter disposed between the power storage device and the power generation device, at least one of the auxiliary device and the low voltage battery, the power storage device, the power generation device, and the downverter. The control unit is configured to reduce the output voltage of the power storage device by the downverter when the remaining capacity or voltage of the power storage device exceeds the stop charging upper limit threshold. When the remaining capacity or voltage of the power storage device falls below the stop charging upper limit threshold, the down-converter operation of the downverter is stopped and the auxiliary device and the low-voltage battery are applied to the auxiliary device or the low-voltage battery. The voltage application to at least one of the batteries may be stopped, and then the contactor may be opened.

  Alternatively, the electric vehicle may further include a downverter disposed between the power storage device and the power generation device, at least one of the auxiliary machine and the low voltage battery, the power storage device, the power generation device, and the down A contactor disposed between the converter, the downverter and the contactor, a DC / DC converter disposed between the power generator, the downverter and the contactor, and the DC / DC converter. And a smoothing capacitor disposed between the control unit, the output voltage of the power storage device by the downverter when the voltage on the primary side of the DC / DC converter is higher than the charging upper limit threshold at the time of stop. Is applied to at least one of the auxiliary machine and the low-voltage battery, and the voltage on the primary side of the DC / DC converter is reduced. When falling below the stop charging upper limit threshold value, the contactor is opened, and thereafter, the electric power stored in the smoothing capacitor is supplied to at least one of the auxiliary machine and the low-voltage battery via the downverter, and thereafter The downverter may be stopped.

  The power storage device control method according to the present invention includes: a power generation device that supplies power to a load; a power storage device that is connected in parallel to the power generation device with respect to the load and is capable of storing the generated power of the power generation device; A method for controlling a power storage device in an electric power system, comprising: a detection unit that detects a remaining capacity or voltage of the power storage device; and a control unit that controls the remaining capacity or voltage of the power storage device, wherein the operation of the load is stopped The control unit causes the power storage device to be discharged until the remaining capacity or voltage of the power storage device reaches a stop charge upper limit threshold, and the stop charge upper limit threshold is used to ensure the next start of the load. It is set to be equal to or higher than a start ensuring lower limit threshold and lower than a continuous deterioration suppression upper limit threshold capable of suppressing deterioration of the power storage device even when the remaining capacity or voltage is continuously maintained.

  According to the present invention, when the operation of the load is stopped, the remaining capacity or voltage of the power storage device is set to be equal to or higher than a start ensuring lower limit threshold for ensuring the next start of the load. Can be performed reliably. Further, when the operation of the load is stopped, the remaining capacity or voltage of the power storage device is a continuous deterioration suppression upper limit threshold value that can suppress deterioration of the power storage device even if the remaining capacity or voltage is continuously maintained. Since it is set as follows, it is possible to suppress deterioration of the power storage device when the operation of the load is stopped. Furthermore, after the load operation stops, the power storage device discharges until it reaches the charge stop upper limit threshold value (a value set to be equal to or higher than the start securing lower limit threshold value and below the continuous deterioration suppression upper limit threshold value). The remaining capacity or voltage of the power storage device can be controlled by a method different from that at the time of stopping, and the remaining capacity or voltage of the power storage device can be controlled more suitably. As a result, during operation of the load, better operating performance can be exhibited without limiting the remaining capacity or voltage of the power storage device or by applying a limitation different from that during operation stop.

  Here, the control unit sets an operation charge target value that is greater than or equal to the start ensuring lower limit threshold and less than or equal to the stop charge upper limit threshold, and during the operation of the load, the control unit performs the predetermined period of time When the average value, median value, peak value, or mode value of the remaining capacity or voltage of the power storage device exceeds the operation charge target value, the control unit causes the load and the load auxiliary devices to be Permitting power supply to at least one, and when the average value, the median value, the peak value, or the mode value is less than the operation charge target value, the control unit causes the load and The power supply to at least one of the load auxiliary machines may be limited.

  According to the present invention, when the operation of the electric vehicle is stopped, the remaining capacity or voltage of the power storage device is set to be equal to or higher than the start ensuring lower limit threshold for ensuring the next start of the electric vehicle. The next start-up can be performed reliably. In addition, when the operation of the electric vehicle is stopped, the remaining capacity or voltage of the power storage device is a continuous deterioration suppression upper limit capable of suppressing deterioration of the power storage device even if the remaining capacity or voltage is continuously maintained. Since it is set to be equal to or less than the threshold value, deterioration of the power storage device when the electric vehicle is stopped can be suppressed. Further, after the electric vehicle is stopped, the electric storage device is discharged until the stop charging upper limit threshold (a value set to be equal to or higher than the start securing lower limit threshold and lower than the continuous deterioration suppression upper limit threshold). The remaining capacity or voltage of the power storage device can be controlled by a method different from that at the time of shutdown, and the remaining capacity or voltage of the power storage device can be controlled more suitably. As a result, when driving an electric vehicle, it is possible to exhibit better driving performance without limiting the remaining capacity or voltage of the power storage device or by applying a limitation different from that when the operation is stopped.

  Further, according to the present invention, when the operation of the load is stopped, the remaining capacity or voltage of the power storage device is set to be equal to or higher than the start securing lower limit threshold for securing the next start of the load. Can be reliably started. Further, when the operation of the load is stopped, the remaining capacity or voltage of the power storage device is a continuous deterioration suppression upper limit threshold value that can suppress deterioration of the power storage device even if the remaining capacity or voltage is continuously maintained. Since it is set as follows, it is possible to suppress deterioration of the power storage device when the operation of the load is stopped. Furthermore, after the load operation stops, the power storage device discharges until it reaches the charge stop upper limit threshold value (a value set to be equal to or higher than the start securing lower limit threshold value and below the continuous deterioration suppression upper limit threshold value). The remaining capacity or voltage of the power storage device can be controlled by a method different from that at the time of stopping, and the remaining capacity or voltage of the power storage device can be controlled more suitably. As a result, during operation of the load, better operating performance can be exhibited without limiting the remaining capacity or voltage of the power storage device or by applying a limitation different from that during operation stop.

A. Hereinafter, an electric vehicle according to an embodiment of the present invention will be described with reference to the drawings.

1. Configuration of Electric Vehicle 10 (1) Overall Configuration FIG. 1 is a circuit diagram of an electric vehicle 10 according to the present invention. The electric vehicle 10 includes a power system 12 and a motor unit 20. The power system 12 includes an FC unit 40, a battery unit 60, and an integrated control unit 100 (hereinafter referred to as “integrated ECU 100” (ECU: Electric Control Unit)).

  The motor unit 20 generates a driving force for the electric vehicle 10 using the driving motor 22 when the electric vehicle 10 is powered, and the regenerative power generated by the motor 22 (motor regenerative power Preg) when the electric vehicle 10 is regenerated. ) [W] is supplied to the battery unit 60.

  The FC unit 40 supplies power (FC output power Pfc) [W] generated by a fuel cell 42 (hereinafter referred to as “FC42”) to the motor unit 20 when the electric vehicle 10 is powered. During regeneration, the FC output power Pfc is supplied to the battery unit 60.

  The battery unit 60 supplies electric power (battery output power Pbat) [W] from the power storage device 62 (hereinafter referred to as “battery 62”), which is energy storage, to the motor unit 20 when the electric vehicle 10 is powered. During the regeneration of the electric vehicle 10, the motor regenerative power Preg and the FC output power Pfc are stored in the battery 62.

  The integrated ECU 100 controls the motor unit 20, the FC unit 40, and the battery unit 60. Details will be described later.

(2) Motor unit 20
In addition to the motor 22, the motor unit 20 includes a power drive unit 24 (hereinafter referred to as “PDU24”), a speed reducer 26, a shaft 28, wheels 30 and a motor control unit 32 (hereinafter referred to as “motor ECU 32”). For example).

  The PDU 24 performs DC / AC conversion between the output current (FC output current Ifc) [A] from the FC 42 and the output current (battery output current Ibat) [A] from the battery 62 when the electric vehicle 10 is powered. Is supplied to the motor 22 as a current for driving the motor 22 (motor driving current Imd) [A]. The rotation of the motor 22 accompanying the supply of the motor drive current Imd is transmitted to the wheels 30 through the speed reducer 26 and the shaft 28.

  In addition, the PDU 24 performs AC / DC conversion of the regenerative current (motor regenerative current Imr) [A] from the motor 22 and supplies it to the battery unit 60 as the battery charging current Ibc during regeneration of the electric vehicle 10. The battery 62 is charged by the supply of the battery charging current Ibc. The battery charging current Ibc may be supplied to an auxiliary machine 88 and a low voltage battery 90 described later.

  The motor ECU 32 controls the operation of the motor 22 and the PDU 24.

(3) FC unit 40
In addition to the FC 42, the FC unit 40 includes a hydrogen tank 44, an air compressor 46, an FC control unit 48 (hereinafter referred to as “FC ECU 48”), a backflow prevention diode 50, a voltage sensor 52, and a current sensor 54. And have.

  The FC 42 has, for example, a stack structure in which cells formed by sandwiching a solid polymer electrolyte membrane between an anode electrode and a cathode electrode from both sides are stacked. A hydrogen tank 44 and an air compressor 46 are connected to the FC 42 by piping. Pressurized hydrogen in the hydrogen tank 44 is supplied to the anode electrode of the FC 42. Further, air is supplied to the cathode electrode of the FC 42 by the air compressor 46. The operations of the hydrogen tank 44 and the air compressor 46 are controlled by the FC ECU 48. An FC output current Ifc is generated by an electrochemical reaction between hydrogen (fuel gas), which is a reaction gas, and air (oxidant gas) in the FC 42. The FC output current Ifc is supplied via the current sensor 54 and the backflow prevention diode 50 to the PDU 24 when the electric vehicle 10 is powered, and to the battery unit 60 during regeneration. The FC output voltage Vfc [V] as a detection value by the voltage sensor 52 and the FC output current Ifc as a detection value by the current sensor 54 are used for operation control of the FC 42 and the like.

(4) Battery unit 60
In addition to the battery 62, the battery unit 60 includes a battery control unit 64 (hereinafter referred to as “battery ECU 64”), a voltage sensor 66, contactors 68a and 68b, a DC / DC converter 70, and a converter control unit 72 (hereinafter referred to as “battery ECU 64”). "Converter ECU 72"), smoothing capacitors 74, 76, voltage sensors 78, 80, current sensors 82, 84, downverter 86, auxiliary equipment 88, low voltage battery 90, and low voltage battery. It includes a control unit 92 (hereinafter referred to as “low voltage battery ECU 92”), a contactor 94, a discharge resistor 96, and a contactor 98.

  The battery 62 is connected to the primary side 1S of the DC / DC converter 70. For example, a lithium ion secondary battery or a capacitor can be used. In this embodiment, a lithium ion secondary battery is used.

  The battery ECU 64 monitors the temperature of the battery 62 (battery temperature Tbat) [° C.], the remaining capacity SOC [%], and the like, and when an overcharge or abnormality of the battery 62 is detected, opens the contactors 68a and 68b. Charge / discharge is limited or stopped to protect the battery 62. The remaining capacity SOC of the battery 62 is measured based on the voltage (battery voltage Vbat) [V] of the battery 62 detected by the voltage sensor 66. Further, the battery ECU 64 has a memory 64a.

  The DC / DC converter 70 is a so-called chopper step-up / step-down DC / DC converter. When the electric vehicle 10 is powered, the voltage on the primary side 1S (primary voltage V1) [V] of the DC / DC converter 70 is boosted. Then, the voltage is supplied to the secondary side 2S, and when the electric vehicle 10 is regenerated, the voltage (secondary voltage V2) [V] of the secondary side 2S of the DC / DC converter 70 is stepped down and supplied to the primary side 1S. That is, the battery is generated by the regenerative voltage (motor regenerative voltage Vreg) [V] generated by the motor 22 or the secondary voltage V2, which is the FC output voltage Vfc of the FC 42, converted to a low voltage by the DC / DC converter 70. 62 is charged.

  Converter ECU 72 controls DC / DC converter 70 based on a command from integrated ECU 100 and a detected value of current sensor 54 of FC unit 40.

  The voltage sensor 78 detects the primary voltage V1, and the voltage sensor 80 detects the secondary voltage V2. The current sensor 82 detects the primary side 1S current (primary current I1) [A], and the current sensor 84 detects the secondary side 2S current (secondary current I2) [A].

  The downverter 86 steps down the primary voltage V 1 and applies it to the auxiliary device 88 and the low voltage battery 90. The auxiliary machine 88 includes, for example, a light, a power window, a wiper motor, an audio device, a car navigation system, and the like. The low voltage battery 90 is lower in voltage (for example, 12V) than the battery 62 for driving the motor 22. The low voltage battery ECU 92 monitors the voltage or the like of the low voltage battery 90, and when an overcharge or abnormality of the low voltage battery 90 is detected, the low voltage battery ECU 92 limits or stops charging / discharging by opening the contactor 94. Protect 90.

  The contactor 98 opens and closes in response to a command from the integrated ECU 100 and controls discharge by the discharge resistor 96.

(5) Integrated ECU 100
Based on the required power of the motor 22 (motor required power Pmr_req) [W], the required power of the FC unit 40 (air compressor 46, etc.), the required power of the auxiliary device 88, etc., the integrated ECU 100, the motor ECU 32, the FC ECU 48, the battery The ECU 64, the converter ECU 72, and the low voltage battery ECU 92 are controlled.

  The integrated ECU 100 includes a CPU, a ROM, a RAM, a timer, an input / output interface such as an A / D converter and a D / A converter, and a DSP (Digital Signal Processor) as necessary. The same applies to the motor ECU 32, the FC ECU 48, the battery ECU 64, the converter ECU 72, and the low voltage battery ECU 92.

  The integrated ECU 100, the motor ECU 32, the FC ECU 48, the battery ECU 64, the converter ECU 72, and the low-voltage battery ECU 92 are connected to each other through a communication line 102 such as a CAN (Controller Area Network) that is an in-vehicle LAN. These ECUs share input / output information from various switches and various sensors, and each CPU executes various programs by executing programs stored in each ROM with input / output information from these various switches and various sensors as inputs. Is realized.

(6) Others As various switches and various sensors for detecting the vehicle state, in addition to the voltage sensors 52, 66, 78, 80 and current sensors 54, 82, 84 described above, an ignition switch 110 ( Hereinafter referred to as “IGSW 110”), an accelerator sensor 112, a brake sensor 114, a vehicle speed sensor 116, an outside air temperature sensor 118, and the like. The outside air temperature sensor 118 detects the outside air temperature Tex [° C.] of the electric vehicle 10.

2. Control of Remaining Capacity SOC FIG. 2 shows a flowchart for controlling the remaining capacity SOC of the battery 62. The remaining capacity SOC is controlled by the battery ECU 64, the converter ECU 72, the low voltage battery ECU 92, and the integrated ECU 100 in cooperation. In step S1, the integrated ECU 100 determines whether the IGSW 110 is turned on. If IGSW 110 is off (S1: No), step S1 is repeated. When IGSW 110 is on (S1: Yes), in-operation control that is control during operation of electric vehicle 10 is executed in step S2.

  FIG. 3 shows a flowchart of the on-time control. In step S <b> 11, the battery ECU 64 acquires the outside air temperature Tex from the outside air temperature sensor 118 via the communication line 102. In subsequent step S12, the battery ECU 64 sets the first upper limit threshold TH_SOC1 [%] and the second upper limit threshold TH_SOC2 [%] of the remaining capacity SOC according to the outside air temperature Tex.

  The first upper limit threshold value TH_SOC1 is an upper limit threshold value (remaining charge upper limit threshold value) of the remaining capacity SOC when the electric vehicle 10 is stopped. In the present embodiment, the remaining capacity SOC (or a battery corresponding thereto) continuously. Even if the voltage Vbat) is maintained, the upper limit threshold (continuous deterioration suppression upper limit threshold) that can suppress the deterioration of the battery 62 is set to a value equal to that. The continuous deterioration suppression upper limit threshold is an upper threshold at which the battery 62 does not progress or is slightly degraded even if the battery 62 is maintained at the remaining capacity SOC for a long time (for example, several hours to several days). is there. The first upper limit threshold TH_SOC1 does not necessarily have to be equal to the continuous deterioration suppression upper limit threshold, and is equal to or higher than the lower limit threshold (starting securing lower limit threshold TH_SOC3) [%] for securing the next startup of the electric vehicle 10. It is possible to set it to be equal to or lower than the static deterioration suppression upper limit threshold.

  The second upper limit threshold TH_SOC2 is an upper limit threshold (remaining charge upper limit threshold) of the remaining capacity SOC during the operation of the electric vehicle 10, and in this embodiment, the battery 62 is not deteriorated or deteriorated if temporarily. It is set to a value equal to a slight upper limit threshold (temporary deterioration suppression upper limit threshold). The temporary deterioration suppression upper limit threshold is an upper limit threshold that can suppress deterioration of the battery 62 even if the battery 62 is maintained at the remaining capacity SOC for a short time (for example, several seconds to several minutes). The second upper limit threshold TH_SOC2 does not necessarily have to be equal to the temporary deterioration suppression upper limit threshold, and can be set to be higher than the first upper limit threshold TH_SOC1 and equal to or lower than the temporary deterioration suppression upper limit threshold.

  As shown in FIG. 4, the first upper limit threshold TH_SOC1 is higher than the activation ensuring lower limit threshold TH_SOC3, and the second upper limit threshold TH_SOC2 is higher than the first upper limit threshold TH_SOC1 (TH_SOC3 <TH_SOC1 <TH_SOC2). Any of the first upper limit threshold TH_SOC1, the second upper limit threshold TH_SOC2, and the start ensuring lower limit threshold TH_SOC3 can be obtained from experimental values, theoretical values, or simulation values.

  The first upper limit threshold TH_SOC1, the second upper limit threshold TH_SOC2, and the start ensuring lower limit threshold TH_SOC3 are all set higher as the outside air temperature Tex is lower.

  In FIG. 4, the curve indicated by reference numeral 200 is a frequency characteristic indicating the frequency of the value taken by the remaining capacity SOC in the present embodiment. A curve indicated by reference numeral 202 is a frequency characteristic indicating the frequency of the value taken by the remaining capacity SOC in the comparative example. As can be seen from FIG. 4, the frequency characteristic 200 is closer to the right side in the figure than the frequency characteristic 202, and the remaining capacity SOC is maintained higher in this embodiment. In the present embodiment, there is a region 204 that is equal to or greater than the first upper limit threshold TH_SOC1 and equal to or less than the second upper limit threshold TH_SOC2. The motor regenerative power Preg can be effectively utilized for this area 204.

  Returning to FIG. 3, in step S <b> 13, the battery ECU 64 acquires (calculates) the remaining capacity SOC based on the battery voltage Vbat notified from the voltage sensor 66. In subsequent step S14, battery ECU 64 calculates a mode value SOCmode [%] of remaining capacity SOC. The mode value SOCmode is the most frequent value among the values taken by the remaining capacity SOC. As will be described later, another value can be used in place of the mode SOCmode.

  In step S15, the battery ECU 64 compares the remaining capacity SOC with the second upper limit threshold TH_SOC2. When the remaining capacity SOC is equal to or less than the second upper limit threshold TH_SOC2 (S15: Yes), the battery ECU 64 permits the battery 62 to be charged in step S16. Specifically, the battery ECU 64 does not transmit to the integrated ECU 100 a charging prohibition signal Scp that prohibits charging of the battery 62. When the remaining capacity SOC exceeds the second upper limit threshold TH_SOC2 (S15: No), charging the battery 62 is prohibited in step S17. Specifically, battery ECU 64 transmits charge prohibition signal Scp to integrated ECU 100. The integrated ECU 100 that has received the charge inhibition signal Scp transmits to the converter ECU 72 a step-down inhibition signal Sdv that inhibits the step-down operation of the DC / DC converter 70. The converter ECU 72 that has received the step-down inhibition signal Sdv inhibits the step-down operation of the DC / DC converter 70. Specifically, only the step-up switching element (not shown) of the DC / DC converter 70 is driven, and the step-down switching element (not shown) is not driven. Alternatively, driving of both the step-up switching element and the step-down switching element may be stopped.

  In step S18, the battery ECU 64 compares the mode SOC value of the remaining capacity SOC with the first upper limit threshold TH_SOC1. When the mode value SOCmode is equal to or less than the first upper limit threshold TH_SOC1 (S18: Yes), the battery ECU 64 ends the current process (the process of FIG. 3) as it is. When the mode value SOCmode exceeds the first upper limit threshold TH_SOC1 (S18: No), a first discharge process for discharging the battery 62 is performed in step S19. Specifically, the battery ECU 64 transmits a first discharge process request signal Sdr1 for requesting the first discharge process to the integrated ECU 100. Receiving the first discharge processing request signal Sdr1, the integrated ECU 100 operates the downverter 86 via the low voltage battery ECU 92 to apply the battery voltage Vbat to the auxiliary device 88 and the low voltage battery 90. Thereby, the battery 62 is discharged. Alternatively, the regenerative process by the motor 22 may be temporarily stopped from the integrated ECU 100 to the motor ECU 32.

  Returning to FIG. 2, in step S3, the integrated ECU 100 determines whether the IGSW 110 is turned off. When the IGSW 110 is on (S3: No), the process returns to step S2 and the on-operation control is continued. When IGSW 110 is off (S3: Yes), stop-time control that is control when operation of electric vehicle 10 is stopped is executed in step S4.

  FIG. 5 shows a flowchart of the stop time control in the present embodiment. In step S21, the battery ECU 64 compares the remaining capacity SOC with the first upper limit threshold TH_SOC1. When the remaining capacity SOC is equal to or less than the first upper limit threshold TH_SOC1 (S21: Yes), the process proceeds to step S22. In step S22, the battery ECU 64 compares the primary voltage V1 detected by the voltage sensor 78 with the primary voltage threshold TH_V1 [V]. The primary voltage threshold TH_V1 is set to a voltage that ensures that the battery 62 is not charged. For example, the primary voltage threshold TH_V1 is equal to the battery voltage Vbat when the remaining capacity SOC of the battery 62 is the first upper limit threshold TH_SOC1. . When the primary voltage V1 is equal to or lower than the primary voltage threshold TH_V1 (S22: Yes), in step S23, the battery ECU 64 opens the contactors 68a and 68b and ends the stop process.

  In step S21, when the remaining capacity SOC exceeds the first upper limit threshold TH_SOC1 (S21: No), or in step S22, when the primary voltage V1 exceeds the primary voltage threshold TH_V1 (S22: No), in step S24, A second discharge process for discharging the battery 62 is performed. Specifically, the battery ECU 64 transmits a second discharge process request signal Sdr2 for requesting the second discharge process to the integrated ECU 100. Receiving the second discharge processing request signal Sdr2, the integrated ECU 100 operates the downverter 86 via the low voltage battery ECU 92 to apply the battery voltage Vbat to the auxiliary device 88 and the low voltage battery 90. Thereby, the battery 62 is discharged. When application to the auxiliary machine 88 and the low voltage battery 90 is impossible, the contactor 98 may be closed by the integrated ECU 100 and power may be consumed by the discharge resistor 96.

  In subsequent step S25, the integrated ECU 100 determines whether or not the IGSW 110 is turned on. When the IGSW 110 is off (S25: No), the process returns to step S21. When the IGSW 110 is on (S21: Yes), the stop control is stopped.

3. As described above, in the present embodiment, when the IGSW 110 is turned off and the operation of the electric vehicle 10 is stopped, the remaining capacity SOC of the battery 62 ensures the next activation of the electric vehicle 10. Therefore, the next startup of the electric vehicle 10 can be performed reliably. When the IGSW 110 is turned off, the remaining capacity SOC of the battery 62 is a first upper limit threshold TH_SOC1 (continuous deterioration) that can suppress the deterioration of the battery 62 even if the remaining capacity SOC is continuously maintained. Therefore, the deterioration of the battery 62 when the electric vehicle 10 is stopped can be suppressed. Furthermore, since the remaining capacity SOC of the battery 62 is discharged after the electric vehicle 10 is stopped until the first upper limit threshold TH_SOC1 is reached, the remaining capacity of the battery 62 is different during the operation of the electric vehicle 10 than when the operation is stopped. The SOC can be controlled, and the remaining capacity SOC of the battery 62 can be controlled more suitably. As a result, when the electric vehicle 10 is in operation, it is possible to exhibit better driving performance by adding a restriction different from that at the time of operation stop to the remaining capacity SOC of the battery 62.

  In the present embodiment, during operation of the electric vehicle 10, the remaining capacity SOC of the battery 62 is maintained at or near the first upper limit threshold TH_SOC1 while appropriately supplying electric power from the battery 62 to the auxiliary device 88 and the low voltage battery 90. be able to. For this reason, when the operation of the electric vehicle 10 is stopped, the remaining capacity SOC of the battery 62 is expected to be equal to or lower than the first upper limit threshold TH_SOC1, and the necessity of discharging the battery 62 by the battery ECU 64 is reduced. be able to. As a result, it is possible to reduce the power consumed by the discharge resistor 96 wastefully (not effectively used) and improve the fuel efficiency of the electric vehicle 10.

  In the present embodiment, the battery 62 can store the regenerative electric power Preg of the motor 22, and the battery ECU 64 can maintain the battery 62 up to a second upper limit threshold TH_SOC2 that is larger than the first upper limit threshold TH_SOC1 during operation of the electric vehicle 10. Allow charging. In general, the time during which the electric vehicle 10 is operated is much shorter than the time during which the operation is stopped. For this reason, even when the remaining capacity SOC of the battery 62 exceeds the first upper limit threshold TH_SOC1 (continuous deterioration suppression upper limit threshold) during operation of the electric vehicle 10, the battery 62 does not deteriorate or is slight. Therefore, by enabling charging exceeding the first upper limit threshold TH_SOC1 only during operation of the electric vehicle 10, it is possible to recover more motor regenerative power Preg while suppressing deterioration of the battery 62.

  In the present embodiment, the electric vehicle 10 includes an outside air temperature sensor 118 that detects the outside air temperature Tex of the electric vehicle 10, and the battery ECU 64 sets the first upper limit threshold TH_SOC1 higher as the outside air temperature Tex is lower. The battery 62 is less likely to deteriorate as the temperature is lower. For this reason, the lower the battery 62 is, the higher the first upper limit threshold TH_SOC1 is set, so that the remaining capacity SOC of the battery 62 can be set higher while suppressing the deterioration of the battery 62. Further, when the battery 62 is charging / discharging (when the electric vehicle 10 is in operation), the battery temperature Tbat becomes high, while when the battery 62 stops charging / discharging (the electric vehicle 10 stops operating). The battery temperature Tbat is substantially equal to the outside air temperature Tex. Therefore, the first upper limit threshold TH_SOC1 can be set more appropriately based on the outside air temperature Tex. The same applies to the second upper limit threshold TH_SOC2 and the start ensuring lower limit threshold TH_SOC3.

  In the present embodiment, when the remaining capacity SOC of the battery 62 becomes equal to or less than the first upper limit threshold TH_SOC1 (S21 in FIG. 5: Yes), the power supply from the battery 62 to the auxiliary device 88 and the low voltage battery 90 is stopped. Later (S22: Yes), the contactors 68a and 68b are opened. Therefore, welding of the contactors 68a and 68b accompanying the power supply from the battery 62 to the auxiliary device 88 and the low voltage battery 90 can be prevented, and the life of the contactors 68a and 68b can be extended.

B. Modifications It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted based on the contents described in this specification. For example, the following configuration can be adopted.

1. Mounting target and load In the above-described embodiment, the power system 12 including the FC 42 and the battery 62 is mounted on the electric vehicle 10, but the present invention is not limited thereto, and may be mounted on another target. For example, the electric power system 12 can be used for a moving body such as a ship or an aircraft. Alternatively, the power system 12 may be used as a home power system. In this case, it is preferable to combine with a generator that temporarily generates electric power, such as a wind power generation system or a solar power generation system. Moreover, in the said embodiment, although the motor 22 for driving | running | working was mentioned as a load of the electric power system 12, it can also be set as another load according to the use of the electric power system 12. FIG.

2. In the above embodiment, the FC 42 is used as the power generator connected to the motor 22 (load) in parallel with the battery 62. However, other power generators such as a power generator combining an engine and an alternator may be used. .

3. Control Unit In the above-described embodiment, the remaining capacity SOC of the battery 62 is controlled mainly by the battery ECU 64. However, the present invention is not limited to this, and can be controlled mainly by the integrated ECU 100, for example.

4). Remaining capacity SOC
In the above embodiment, the control based on the remaining capacity SOC [%] is performed, but the control based on the battery voltage Vbat can also be performed. That is, since the remaining capacity SOC and the battery voltage Vbat have a one-to-one correspondence, the remaining capacity SOC in the above-described control can be replaced with the battery voltage Vbat. In this case, each threshold (first upper limit threshold TH_SOC, second upper limit threshold TH_SOC2, and start ensuring lower limit threshold TH_SOC3) is changed to a value corresponding to the battery voltage Vbat.

5). When the electric vehicle 10 is stopped In the above-described embodiment, two cases of when the IGSW 110 is on and when it is off have been described. However, in a general vehicle, the key is removed from the key cylinder and the control system is stopped ( In addition to the state in which the control system can be operated as a whole (overall operable state) by inserting the key into the key cylinder and turning it to the start position, the key can be "accessory (ACC)". By turning to the position, the operation of the engine or the motor is stopped, but an accessory such as an audio device can switch an operable state (partial operable state) by the IGSW 110. The above embodiment can also be applied to such a vehicle. In this case, whether or not charging of the battery 62 is permitted or prohibited in the partially operable state can be appropriately selected.

6). Auxiliary machine 88, low voltage battery 90 and discharge resistor 96
In the above embodiment, the auxiliary device 88, the low-voltage battery 90, and the discharge resistor 96 are provided as means for discharging the battery 62, but these may be omitted if there are other discharge means. Examples of other discharge means include a flow rate control valve (not shown) of the hydrogen tank 44 of the FC unit 40, an air compressor 46, and a cooling pump (not shown) of the FC42.

  Further, if all the electric power generated by the discharge of the battery 62 is consumed by at least one of the auxiliary device 88 and the low voltage battery 90, the discharge resistor 96 can be omitted.

7). Charging target value during driving In the above embodiment, when the mode SOC SOC mode of the remaining capacity SOC of the battery 62 is equal to or lower than the first upper limit threshold TH_SOC1 during the driving of the electric vehicle 10 (S18 in FIG. 3: Yes), the first When the mode SOC value exceeds the first upper limit threshold TH_SOC1 without performing the discharge process (S18: No), the first discharge process is performed (S19). In other words, the first upper limit threshold TH_SOC1 is used as the target value of the mode SOC value during operation. However, the target value is not limited to this as long as it is greater than or equal to the start securing lower limit threshold TH_SOC3 and less than or equal to the first upper limit threshold TH_SOC1. However, it can be appropriately changed according to the specifications of the power system 12.

  Moreover, in the said embodiment, although mode mode SOCmode was used as a comparison object with 1st upper limit threshold value TH_SOC1, it is not restricted to this. For example, the current value, average value, median value, or peak value of the remaining capacity SOC can be used similarly.

  Further, in the above-described embodiment, when the mode value SOCmode is equal to or less than the first upper limit threshold value TH_SOC1 (S18: Yes), no special processing is performed, but the mode value SOCmode is less than the first upper limit threshold value TH_SOC1. Sometimes, power supply from the battery 62 to the motor 22 may be limited.

  Furthermore, instead of controlling the mode SOCmode during operation of the electric vehicle 10, the electric vehicle 10 is allowed to travel on a test course for a predetermined travel period or a predetermined travel distance, and the mode SOC SOC immediately after the travel is the first upper limit threshold TH_SOC1. The specifications of the battery 62 may be selected or power management by the integrated ECU 100 may be performed so as to be as follows.

8). In the above embodiment, the first upper limit threshold TH_SOC1 (stop charge upper limit threshold), the second upper limit threshold TH_SOC2 (operation charge upper limit threshold), and the outside temperature Tex detected by the outside temperature sensor 118 are used. Although the track securing lower limit threshold TH_SOC3 is set, the present invention is not limited to this. For example, the first upper limit threshold TH_SOC1, the second upper limit threshold TH_SOC2, and the start ensuring lower limit threshold TH_SOC3 may be set based on the battery temperature Tbat. Alternatively, the first upper limit threshold TH_SOC1, the second upper limit threshold TH_SOC2, and the start ensuring lower limit threshold TH_SOC3 may be set as fixed values.

  In general, the outside air temperature Tex changes according to the time, and therefore, the outside air temperature Tex may be corrected based on the current time. For example, if the current time is 5 pm, it is highly possible that the outside air temperature Tex will gradually decrease thereafter, and therefore a value lower than the current outside air temperature Tex by a predetermined value can be used as the correction value. .

  Further, the current or future outside air temperature Tex may be acquired from the outside of the electric vehicle 10 through wireless communication without being acquired by the temperature sensor mounted on the electric vehicle 10.

9. Control at the time of stop In the above embodiment, the control at the time of stop is performed by the method as shown in FIG. 5, but the present invention is not limited to this. For example, the stop-time control can be performed by the method shown in FIG.

  In step S31 of FIG. 6, the battery ECU 64 compares the remaining capacity SOC of the battery 62 with the first upper limit threshold TH_SOC1. When the remaining capacity SOC is equal to or lower than the first upper limit threshold TH_SOC1 (S31: Yes), in step S32, the battery ECU 64 opens the contactors 68a and 68b. When the remaining capacity SOC exceeds the first upper limit threshold TH_SOC1 (S31: No), a second discharge process for discharging the battery 62 is performed in step S33. This second discharge process is the same as the process in step S24 of FIG. In subsequent step S34, the integrated ECU 100 determines whether or not the IGSW 110 is turned on. If the IGSW 110 is off (S34: No), the process returns to step S31. When the IGSW 110 is on (S34: Yes), the stop control is stopped.

  In step S35 subsequent to step S32, remaining power consumption processing is performed. The remaining power consumption process is a process for consuming power remaining on the primary side 1S (particularly, the smoothing capacitor 74) and the secondary side 2S (particularly the smoothing capacitor 76) of the DC / DC converter 70. Specifically, the battery ECU 64 that has opened the contactors 68a and 68b transmits a remaining power consumption processing request signal Src requesting the remaining power consumption processing to the integrated ECU 100. The integrated ECU 100 that has received the remaining power consumption processing request signal Src causes the DC / DC converter 70 to step down the secondary voltage 2V and apply it to the primary side 1S via the converter ECU 72. Further, the integrated ECU 100 operates the downverter 86 via the low voltage battery ECU 92 to apply the primary voltage V1 to the auxiliary device 88 and the low voltage battery 90. As a result, the power remaining on the primary side 1S and the secondary side 2S is consumed. The electric power remaining on the primary side 1S and the secondary side 2S may be consumed by the discharge resistor 96.

  In subsequent step S36, the integrated ECU 100 compares the primary voltage V1 with the primary voltage threshold TH_V1. The primary voltage threshold TH_V1 is the same as that used in step S22 of FIG. When the primary voltage V1 is equal to or lower than the primary voltage threshold TH_V1 (S36: Yes), in step S37, the integrated ECU 100 compares the secondary voltage V2 with the secondary voltage threshold TH_V2 [V]. The secondary voltage threshold TH_V2 is set to a voltage that guarantees that the secondary voltage V2 on the secondary side 2S has been sufficiently lowered, and is set to a value equal to the primary voltage threshold TH_V1, for example. When the secondary voltage V2 is equal to or lower than the secondary voltage threshold TH_V2 (S37: Yes), the stop time control is terminated.

  If the primary voltage V1 exceeds the primary voltage threshold TH_V1 in step S36 (S36: No), or if the secondary voltage V2 exceeds the secondary voltage threshold TH_V2 (S37: No) in step S37, in step S38. The integrated ECU 100 determines whether the IGSW 110 is turned on. If the IGSW 110 is off (S38: No), the process returns to step S35. When the IGSW 110 is on (S38: Yes), the stop control is stopped.

  According to the stop-time control in FIG. 6, by applying the output voltage Vbat of the battery 62 to the low voltage battery 90 by the discharging process in step S33, the electric power discharged from the battery 62 is charged into the low voltage battery 90 and re-applied. Can be used.

1 is a circuit diagram of an electric vehicle according to an embodiment of the present invention. In the said embodiment, it is a flowchart which controls the remaining capacity of a battery. It is a flowchart which shows the detail of the control at the time of the operation | movement in the flowchart of FIG. It is explanatory drawing which shows control of the remaining capacity of the battery in this embodiment, and control of the remaining capacity of the battery in a comparative example. It is a flowchart which shows the detail of the control at the time of a stop in the flowchart of FIG. It is a flowchart which shows the modification of the control at the time of a stop of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Electric vehicle 12 ... Electric power system 22 ... Motor (load) 42 ... Fuel cell (power generation device)
62 ... Battery (power storage device)
64 ... battery ECU (detection unit, control unit)
66 ... Voltage sensor (detection unit) 68a, 68b ... Contactor 70 ... DC / DC converter 74, 76 ... Smoothing capacitor 86 ... Downverter 88 ... Auxiliary machine 90 ... Low voltage battery 118 ... Outside temperature sensor Preg ... Motor regenerative power SOC ... Remaining capacity SOCmode ... Mode of remaining capacity Tbat ... Battery temperature Tex ... Outside temperature TH_SOC1 ... First upper limit threshold (stop charging upper limit threshold, continuous deterioration suppression upper limit threshold, driving charge target value)
TH_SOC2 ... 2nd upper limit threshold (charging upper limit threshold during operation)
TH_SOC3 ... lower threshold Vbat ... battery voltage V1 ... primary voltage

Claims (10)

A drive motor;
A power generator for supplying power to the drive motor;
A power storage device connected in parallel to the power generation device with respect to the drive motor and capable of storing the generated power of the power generation device;
A detection unit for detecting a remaining capacity or voltage of the power storage device;
A control unit that controls the remaining capacity or voltage of the power storage device,
When the operation of the electric vehicle is stopped, the control unit discharges the power storage device until the remaining capacity or voltage of the power storage device reaches a charge upper limit threshold at the time of stoppage,
The charging upper limit threshold at the time of stopping is equal to or higher than a starting securing lower limit threshold for securing the next starting of the electric vehicle, and suppresses deterioration of the power storage device even if the remaining capacity or voltage is continuously maintained. An electric vehicle characterized by being set to be equal to or lower than a possible continuous deterioration suppression upper limit threshold. The electric vehicle according to claim 1,
The electric vehicle further includes at least one of an auxiliary machine and a low voltage battery,
The controller is
Set an operation charge target value that is not less than the start securing lower limit threshold and not more than the stop charge upper limit threshold,
During the operation of the electric vehicle, the average value, median value, peak value, or mode value of the remaining capacity or voltage of the power storage device for a predetermined travel period or a predetermined travel distance exceeds the target charge value during operation, Allowing power supply from the power storage device to at least one of the drive motor, the auxiliary machine and the low voltage battery;
When the average value, the median value, the peak value, or the mode value is lower than the charging target value during operation, from the power storage device to at least one of the drive motor, the auxiliary device, and the low-voltage battery. An electric vehicle characterized by limiting power supply. The electric vehicle according to claim 1,
The electric vehicle further includes at least one of an auxiliary machine and a low voltage battery,
The controller is
Set an operation charge target value that is not less than the start securing lower limit threshold and not more than the stop charge upper limit threshold,
During operation of the electric vehicle, when the current remaining capacity or voltage of the power storage device exceeds the target charging value during operation, at least one of the drive motor, the auxiliary device, and the low-voltage battery from the power storage device. Power supply to one,
When the current value is lower than the charging target value during operation, electric power supply from the power storage device to at least one of the drive motor, the auxiliary device, and the low-voltage battery is limited. The electric vehicle according to any one of claims 1 to 3,
The power storage device can store regenerative power of the drive motor,
When the electric vehicle is in operation, the control unit is less than a temporary deterioration suppression upper limit threshold value that is greater than the stop-time charging upper limit threshold value, and that the power storage device does not deteriorate or is only slightly deteriorated if temporarily. An electric vehicle characterized by permitting charging of the power storage device up to a driving upper limit threshold value set in (1). The electric vehicle according to any one of claims 1 to 4,
The electric vehicle further includes an outside air temperature sensor that detects an outside air temperature of the electric vehicle,
The said control part sets the said charging upper limit threshold value at the time of a stop high, so that the said external temperature is low. The electric vehicle characterized by the above-mentioned. The electric vehicle according to any one of claims 1, 4, and 5,
The electric vehicle further includes at least one of an auxiliary machine and a low voltage battery,
When the operation of the electric vehicle is stopped, the control unit supplies power from the power storage device to at least one of the auxiliary machine and the low-voltage battery, so that the remaining capacity or voltage of the power storage device is The electric vehicle, wherein the power storage device is discharged until a charging upper limit threshold is reached. The electric vehicle according to claim 6, wherein
The electric vehicle further includes:
A downverter disposed between the power storage device and the power generation device, and at least one of the auxiliary device and the low-voltage battery;
The power storage device, and a contactor disposed between the power generation device and the downverter,
The controller is
When the remaining capacity or voltage of the power storage device exceeds the charging upper limit threshold at the time of stoppage, the output voltage of the power storage device is stepped down by the downverter and applied to the auxiliary device or the low voltage battery,
When the remaining capacity or voltage of the power storage device falls below the charging upper limit threshold value at the time of stoppage, the step-down operation of the downverter is stopped to stop voltage application to at least one of the auxiliary machine and the battery, An electric vehicle characterized by opening the contactor. The electric vehicle according to claim 6, wherein
The electric vehicle further includes:
A downverter disposed between the power storage device and the power generation device, and at least one of the auxiliary machine and the low-voltage battery;
A contactor disposed between the power storage device, the power generation device and the downverter;
A DC / DC converter disposed between the downverter and the contactor and the power generation device;
A smoothing capacitor disposed between the downverter and the contactor and the DC / DC converter;
The controller is
When the voltage on the primary side of the DC / DC converter exceeds the stop-time charging upper limit threshold, the output voltage of the power storage device is lowered by the downverter to at least one of the auxiliary machine and the low-voltage battery. Applied,
When the primary side voltage of the DC / DC converter falls below the charging upper limit threshold value at the time of stoppage, the contactor is opened, and thereafter, the electric power stored in the smoothing capacitor is supplied to the auxiliary machine and the auxiliary converter via the downverter. An electric vehicle comprising: supplying to at least one of the low-voltage batteries and then stopping the downverter. A power generation device that supplies power to a load; a power storage device that is connected in parallel to the power generation device with respect to the load and that can store the generated power of the power generation device; and a detection that detects a remaining capacity or voltage of the power storage device A storage device in a power system comprising: a control unit that controls a remaining capacity or voltage of the storage device;
When the operation of the load is stopped, the control unit causes the power storage device to discharge until the remaining capacity or voltage of the power storage device reaches a charge upper limit threshold during stoppage,
The stop charging upper limit threshold is equal to or higher than a start ensuring lower limit threshold for securing the next start of the load, and can suppress deterioration of the power storage device even if the remaining capacity or voltage is continuously maintained. A control method for a power storage device, wherein the control method is set to be equal to or lower than a continuous deterioration suppression upper limit threshold value. The power storage device control method according to claim 9,
The control unit sets an operation charge target value that is not less than the start ensuring lower limit threshold and not more than the stop charge upper limit threshold,
During the operation of the load, when the remaining capacity or voltage average value, median value, peak value, or mode value of the power storage device for a predetermined period exceeds the operation charge target value by the control unit, the control Permitting power supply from the power storage device to at least one of the load and an auxiliary machine of the load,
When the average value, the median value, the peak value, or the mode value is lower than the operation charge target value, the control unit causes the power storage device to supply at least one of the load and the load auxiliary device. A method for controlling a power storage device, characterized by limiting power supply.

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