Power supply system and vehicle including the same
First Claim
1. A power supply system including a plurality of power storage units each configured to be capable of charge/discharge, comprising:
- a power line configured to allow supply/reception of electric power between a load device and said power supply system;
a plurality of voltage conversion units provided between said plurality of power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit and said power line, each of said plurality of voltage conversion units being set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation;
actual power value obtaining means for obtaining, on said power line, an actual value of electric power supplied/received to/from said load device;
first determination means for determining which of an allowable power total value, which is a total value of allowable power of said plurality of power storage units, and said actual power value, obtained by said actual power value obtaining means, is greater;
first voltage conversion unit control means for setting one of said plurality of voltage conversion units to said voltage control mode and setting remaining voltage conversion units to said current control mode if said first determination means determines that said actual power value is smaller than said allowable power total value; and
second voltage conversion unit control means for setting said plurality of voltage conversion units to said current control mode if said first determination means determines that said actual power value is equal to or larger than said allowable power total value.
1 Assignment
0 Petitions
Accused Products
Abstract
A converter ECU (2) obtains allowable power total value including at least one of discharge allowable power total value ΣWout of discharge allowable power Wout1, Wout2 and charge allowable power total value ΣWin of charge allowable power Win1, Win2. Then, the converter ECU (2) determines which of the allowable power total value and an actual power value is greater, If the actual power value is smaller than the allowable power total value, the converter ECU (2) controls a converter (8-1) such that an input/output voltage value Vh attains a prescribed target voltage value, and at the same time controls a converter (8-2) such that a battery current value Ib2 attains a prescribed target current value.
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Citations
29 Claims
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1. A power supply system including a plurality of power storage units each configured to be capable of charge/discharge, comprising:
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a power line configured to allow supply/reception of electric power between a load device and said power supply system; a plurality of voltage conversion units provided between said plurality of power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit and said power line, each of said plurality of voltage conversion units being set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation; actual power value obtaining means for obtaining, on said power line, an actual value of electric power supplied/received to/from said load device; first determination means for determining which of an allowable power total value, which is a total value of allowable power of said plurality of power storage units, and said actual power value, obtained by said actual power value obtaining means, is greater; first voltage conversion unit control means for setting one of said plurality of voltage conversion units to said voltage control mode and setting remaining voltage conversion units to said current control mode if said first determination means determines that said actual power value is smaller than said allowable power total value; and second voltage conversion unit control means for setting said plurality of voltage conversion units to said current control mode if said first determination means determines that said actual power value is equal to or larger than said allowable power total value. - View Dependent Claims (2, 3, 4, 5)
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6. A power supply system including a plurality of power storage units each configured to be capable of charge/discharge, comprising:
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a power line configured to allow supply/reception of electric power between a load device and said power supply system; a plurality of voltage conversion units provided between said plurality of power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit and said power line; and a control device;
whereineach of said plurality of voltage conversion units is set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation, said control device obtains, on said power line, an actual value of electric power supplied/received to/from said load device, determines which of an allowable power total value, which is a total value of allowable power of said plurality of power storage units, and obtained actual power value is greater, and sets one of said plurality of voltage conversion units to said voltage control mode and remaining voltage conversion units to said current control mode if it is determined that said actual power value is smaller than said allowable power total value, and sets said plurality of voltage conversion units to said current control mode if it is determined that said actual power value is equal to or larger than said allowable power total value.
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7. A method of controlling a power supply system including a plurality of power storage units each configured to be capable of charge/discharge, a power line configured to allow supply/reception of electric power between a load device and said power supply system, and a plurality of voltage conversion units provided between said plurality of power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit and said power line, each of said plurality of voltage conversion units being set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation, comprising the steps of:
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obtaining, on said power line, an actual value of the electric power supplied/received to/from said load device; determining which of an allowable power total value, which is a total value of allowable power of said plurality of power storage units, and obtained actual power value is greater; setting one of said plurality of voltage conversion units to said voltage control mode and setting remaining voltage conversion units to said current control mode if it is determined that said actual power value is smaller than said allowable power total value; and setting said plurality of voltage conversion units to said current control mode if it is determined that said actual power value is equal to or larger than said allowable power total value.
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8. A vehicle comprising:
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a power supply system having a plurality of power storage units each configured to be capable of charge/discharge; and a drive force generation unit generating drive force by receiving electric power supplied from said power supply system; and said power supply system including a power line configured to allow supply/reception of electric power between said drive force generation unit and said power supply system, a plurality of voltage conversion units provided between said plurality of power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit and said power line, each of said plurality of voltage conversion units being set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation, actual power value obtaining means for obtaining, on said power line, an actual value of the electric power supplied/received to/from said drive force generation unit, first determination means for determining which of an allowable power total value, which is a total value of allowable power of said plurality of power storage units, and said actual power value, obtained by said actual power value obtaining means, is greater, first voltage conversion unit control means for setting one of said plurality of voltage conversion units to said voltage control mode and setting remaining voltage conversion units to said current control mode if said first determination means determines that said actual power value is smaller than said allowable power total value; and second voltage conversion unit control means for setting said plurality of voltage conversion units to said current control mode if said first determination means determines that said actual power value is equal to or larger than said allowable power total value. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A vehicle comprising:
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a power supply system having a plurality of power storage units each configured to be capable of charge/discharge; and a drive force generation unit generating drive force by receiving electric power supplied from said power supply system;
whereinsaid power supply system includes a power line configured to allow supply/reception of electric power between said drive force generation unit and said power supply system, a plurality of voltage conversion units provided between said plurality of power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit and said power line, and a control device, each of said plurality of voltage conversion units is set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation, and said control device obtains, on said power line, an actual value of the electric power supplied/received to/from said drive force generation unit, determines which of an allowable power total value, which is a total value of allowable power of said plurality of power storage units, and obtained actual power value is greater, and sets one of said plurality of voltage conversion units to said voltage control mode and remaining voltage conversion units to said current control mode if it is determined that said actual power value is smaller than said allowable power total value, and sets said plurality of voltage conversion units to said current control mode if it is determined that said actual power value is equal to or larger than said allowable power total value.
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15. A method of controlling a vehicle, said vehicle including a power supply system having a plurality of power storage units each configured to be capable of charge/discharge and a drive force generation unit generating drive force by receiving electric power supplied from said power supply system, said power supply system including a power line configured to allow supply/reception of electric power between said drive force generation unit and said power supply system and a plurality of voltage conversion units provided between said plurality of power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit and said power line, each of said plurality of voltage conversion units being set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation, comprising the steps of:
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obtaining, on said power line, an actual value of the electric power supplied/received to/from said drive force generation unit; determining which of an allowable power total value, which is a total value of allowable power of said plurality of power storage units, and obtained actual power value is greater; setting one of said plurality of voltage conversion units to said voltage control mode and setting remaining voltage conversion units to said current control mode if it is determined that said actual power value is smaller than said allowable power total value; and setting said plurality of voltage conversion units to said current control mode if it is determined that said actual power value is equal to or larger than said allowable power total value.
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16. A power supply system including a plurality of power storage units each configured to be capable of charge/discharge, comprising:
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a power line configured to allow supply/reception of electric power between a load device and said power supply system; a plurality of voltage conversion units provided between said plurality of power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit and said power line, each of said plurality of voltage conversion units being set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation; power storage unit temperature obtaining means for obtaining temperatures of said plurality of power storage units; temperature determination means for determining whether each of the temperatures of said plurality of power storage units obtained by said power storage unit temperature obtaining means is lower than a corresponding temperature lower limit value; first mode setting means for setting said voltage conversion unit, corresponding to said power storage unit of which temperature has been determined by said temperature determination means as lower than said temperature lower limit value, to said current control mode, and sets remaining said voltage conversion units to said voltage control mode; and second mode setting means for setting said plurality of voltage conversion units to either of said current control mode or said voltage control mode, if it is determined that said power storage unit of which temperature is lower than said temperature lower limit value does not exist, wherein said first mode setting means sets solely said voltage conversion unit corresponding to said power storage unit of higher priority to said current control mode, if it is determined that the temperature of all of said plurality of power storage units is lower than corresponding said temperature lower limit value.
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17. A power supply system including a plurality of power storage units each configured to be capable of charge/discharge, comprising:
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a power line configured to allow supply/reception of electric power between a load device and said power supply system, a plurality of voltage conversion units provided between said plurality of power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit and said power line, each of said plurality of voltage conversion units being set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation; power storage unit temperature obtaining means for obtaining temperatures of said plurality of power storage units; temperature determination means for determining whether each of the temperatures of said plurality of power storage units obtained by said power storage unit temperature obtaining means is lower than a corresponding temperature lower limit value; first mode setting means for setting said voltage conversion unit, corresponding to said power storage unit of which temperature has been determined by said temperature determination means as lower than said temperature lower limit value, to said current control mode, and sets remaining said voltage conversion units to said voltage control mode; and second mode setting means for setting said plurality of voltage conversion units to either of said current control mode or said voltage control mode, if it is determined that said power storage unit of which temperature is lower than said temperature lower limit value does not exist, wherein said current target value in said current control mode is set in accordance with the obtained temperature of the power storage unit, for each of said plurality of voltage conversion units, and said current target value is decided based on predetermined charge/discharge characteristic indicating correspondence between a current value and a voltage value of the power storage unit in accordance with the temperature of the power storage unit, such that the voltage value of the power storage unit is not lower than a prescribed voltage lower limit value.
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18. A power supply system including two power storage units each configured to be capable of charge/discharge, comprising:
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a power line configured to allow supply/reception of electric power between a load device and said power supply system; two voltage conversion units provided between said two power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit of said two power storage units and said power line, each of said two voltage conversion units being set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation; power storage unit temperature obtaining means for obtaining temperatures of said two power storage units; temperature determination means for determining whether each of the temperatures of said two power storage units obtained by said power storage unit temperature obtaining means is lower than a corresponding temperature lower limit value; first mode setting means for setting said voltage conversion unit, corresponding to said power storage unit of which temperature has been determined by said temperature determination means as lower than said temperature lower limit value, to said voltage control mode, and sets an other voltage conversion unit to said current control mode; and second mode setting means for setting said two voltage conversion units to either of said current control mode or said voltage control mode, if it is determined that said power storage unit of which temperature is lower than said temperature lower limit value does not exist, wherein said first mode setting means sets solely said voltage conversion unit corresponding to said power storage unit of higher priority to said current control mode, if it is determined that the temperature of all of said two power storage units is lower than corresponding said temperature lower limit value.
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19. A power supply system including a plurality of power storage units each configured to be capable of charge/discharge, comprising:
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a power line configured to allow supply/reception of electric power between a load device and said power supply system; a plurality of voltage conversion units provided between said plurality of power storage units and said power line respectively and each performing a voltage conversion operation between a corresponding power storage unit and said power line; and a control device;
whereineach of said plurality of voltage conversion units is set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation, and said control device obtains temperatures of said plurality of power storage units, determines whether each of obtained temperatures of said plurality of power storage units is lower than a corresponding temperature lower limit value, and sets one of said voltage conversion units, corresponding to said power storage unit of which temperature has been determined as lower than said temperature lower limit value, to said current control mode, and sets remaining said voltage conversion units to said voltage control mode, and sets said plurality of voltage conversion units to either of said current control mode or said voltage control mode, if it is determined that said power storage unit of which temperature is lower than said temperature lower limit value does not exist, wherein said control device sets solely said voltage conversion unit corresponding to said power storage unit of higher priority to said current control mode, if it is determined that the temperature of all of said plurality of power storage units is lower than corresponding said temperature lower limit value.
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20. A method of controlling a power supply system including a plurality of power storage units each configured to be capable of charge/discharge, a power line configured to allow supply/reception of electric power between a load device and said power supply system, and a plurality of voltage conversion units provided between said plurality of power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit and said power line, each of said plurality of voltage conversion units being set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation, comprising the steps of:
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obtaining temperatures of said plurality of power storage units; determining whether each of obtained temperatures of said plurality of power storage units is lower than a corresponding temperature lower limit value; setting one of said plurality of voltage conversion units, corresponding to said power storage unit of which temperature has been determined as lower than said temperature lower limit value, to said current control mode, and setting remaining said voltage conversion units to said voltage control mode; and setting said plurality of voltage conversion units to either of said current control mode or said voltage control mode, if it is determined that said power storage unit of which temperature is lower than said temperature lower limit value does not exist, wherein said setting of one of said plurality of voltage conversion units sets solely said voltage conversion unit corresponding to said power storage unit of higher priority to said current control mode, if it is determined that the temperature of all said of plurality of power storage units is lower than corresponding said temperature lower limit value.
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21. A vehicle comprising:
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a power supply system having a plurality of power storage units each configured to be capable of charge/discharge; and a drive force generation unit generating drive force by receiving electric power supplied from said power supply system; and said power supply system including a power line configured to allow supply/reception of electric power between said drive force generation unit and said power supply system, a plurality of voltage conversion units provided between said plurality of power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit and said power line, each of said plurality of voltage conversion units being set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation, power storage unit temperature obtaining means for obtaining temperatures of said plurality of power storage units, temperature determination means for determining whether each of the temperatures of said plurality of power storage units obtained by said power storage unit temperature obtaining means is lower than a corresponding temperature lower limit value, and first mode setting means for setting said voltage conversion unit, corresponding to said power storage unit of which temperature has been determined by said temperature determination means as lower than said temperature lower limit value, to said current control mode, and for setting remaining said voltage conversion units to said voltage control mode; and second mode setting means for setting said plurality of voltage conversion units to either of said current control mode or said voltage control mode, if it is determined that said power storage unit of which temperature is lower than said temperature lower limit value does not exist, wherein said first mode setting means sets solely said voltage conversion unit corresponding to said power storage unit of higher priority to said current control mode, if it is determined that the temperature of all of said plurality of power storage units is lower than corresponding said temperature lower limit value.
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22. A vehicle comprising:
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a power supply system having a plurality of power storage units each configured to be capable of charge/discharge; and a drive force generation unit generating drive force by receiving electric power supplied from said power supply system; and said power supply system including a power line configured to allow supply/reception of electric power between said drive force generation unit and said power supply system, a plurality of voltage conversion units provided between said plurality of power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit and said power line, each of said plurality of voltage conversion units being set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation, power storage unit temperature obtaining means for obtaining temperatures of said plurality of power storage units, temperature determination means for determining whether each of the temperatures of said plurality of power storage units obtained by said power storage unit temperature obtaining means is lower than a corresponding temperature lower limit value, and first mode setting means for setting said voltage conversion unit, corresponding to said power storage unit of which temperature has been determined by said temperature determination means as lower than said temperature lower limit value, to said current control mode, and for setting remaining said voltage conversion units to said voltage control mode; and second mode setting means for setting said plurality of voltage conversion units to either of said current control mode or said voltage control mode, if it is determined that said power storage unit of which temperature is lower than said temperature lower limit value does not exist, wherein said current target value in said current control mode is set in accordance with the obtained temperature of the power storage unit, for each of said plurality of voltage conversion units, and said current target value is decided based on predetermined charge/discharge characteristic indicating correspondence between a current value and a voltage value of the power storage unit in accordance with the temperature of the power storage unit, such that the voltage value of the power storage unit is not lower than a prescribed voltage lower limit value.
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23. A vehicle comprising:
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a power supply system having a plurality of power storage units each configured to be capable of charge/discharge; and a drive force generation unit generating drive force by receiving electric power supplied from said power supply system;
whereinsaid power supply system includes a power line configured to allow supply/reception of electric power between said drive force generation unit and said power supply system, a plurality of voltage conversion units provided between said plurality of power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit and said power line, and a control device, each of said plurality of voltage conversion units is set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation, and said control device obtains temperatures of said plurality of power storage units, determines whether each of obtained temperatures of said plurality of power storage units is lower than a corresponding temperature lower limit value, and sets one of said voltage conversion unit, corresponding to said power storage unit of which temperature has been determined as lower than said temperature lower limit value, to said current control mode, and sets remaining said voltage conversion units to said voltage control mode, and sets said plurality of voltage conversion units to either of said current control mode or said voltage control mode, if it is determined that said power storage unit of which temperature is lower than said temperature lower limit value does not exist, wherein said control device sets solely said voltage conversion unit corresponding to said power storage unit of higher priority to said current control mode, if it is determined that the temperature of all of said plurality of power storage units is lower than corresponding said temperature lower limit value.
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24. A method of controlling a vehicle, said vehicle including a power supply system having a plurality of power storage units each configured to be capable of charge/discharge and a drive force generation unit generating drive force by receiving electric power supplied from said power supply system, said power supply system including a power line configured to allow supply/reception of electric power between said drive force generation unit and said power supply system and a plurality of voltage conversion units provided between said plurality of power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit and said power line, each of said plurality of voltage conversion units being set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation, comprising the steps of:
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obtaining temperatures of said plurality of power storage units; determining whether each of obtained temperatures of said plurality of power storage units is lower than a corresponding temperature lower limit value; setting one of said voltage conversion units, corresponding to said power storage unit of which temperature has been determined as lower than said temperature lower limit value, to said current control mode, and setting remaining said voltage conversion units to said voltage control mode; and setting said plurality of voltage conversion units to either of said current control mode or said voltage control mode, if it is determined that said power storage unit of which temperature is lower than said temperature lower limit value does not exist, wherein said setting one of said voltage conversion units sets solely said voltage conversion unit corresponding to said power storage unit of higher priority to said current control mode, if it is determined that the temperature of all of said plurality of power storage units is lower than corresponding said temperature lower limit value.
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25. A power supply system including two power storage units each configured to be capable of charge/discharge, comprising:
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a power line configured to allow supply/reception of electric power between a load device and said power supply system; two voltage conversion units provided between said two power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit of said two power storage units and said power line, each of said two voltage conversion units being set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation; power storage unit temperature obtaining means for obtaining temperatures of said two power storage units; temperature determination means for determining whether each of the temperatures of said two power storage units obtained by said power storage unit temperature obtaining means is lower than a corresponding temperature lower limit value; first mode setting means for setting said voltage conversion unit, corresponding to said power storage unit of which temperature has been determined by said temperature determination means as lower than said temperature lower limit value, to said voltage control mode, and sets an other voltage conversion unit to said current control mode; and second mode setting means for setting said two voltage conversion unitsto either of said current control mode or said voltage control mode, if it is determined that said power storage unit of which temperature is lower than said temperature lower limit value does not exist, wherein said current target value in said current control mode is set in accordance with the obtained temperature of the power storage unit, for each of said two voltage conversion units, and said current target value is decided based on predetermined charge/discharge characteristic indicating correspondence between a current value and a voltage value of the power storage unit in accordance with the temperature of the power storage unit, such that the voltage value of the power storage unit is not lower than a prescribed voltage lower limit value.
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26. A power supply system including a plurality of power storage units each configured to be capable of charge/discharge, comprising:
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a power line configured to allow supply/reception of electric power between a load device and said power supply system; a plurality of voltage conversion units provided between said plurality of power storage units and said power line respectively and each performing a voltage conversion operation between a corresponding power storage unit and said power line; and a control device;
whereineach of said plurality of voltage conversion units is set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation, and said control device obtains temperatures of said plurality of power storage units, determines whether each of obtained temperatures of said plurality of power storage units is lower than a corresponding temperature lower limit value, and sets one of said voltage conversion units, corresponding to said power storage unit of which temperature has been determined as lower than said temperature lower limit value, to said current control mode, and sets remaining said voltage conversion units to said voltage control mode, and sets said plurality of voltage conversion units to either of said current control mode or said voltage control mode, if it is determined that said power storage unit of which temperature is lower than said temperature lower limit value does not exist, wherein said current target value in said current control mode is set in accordance with the obtained temperature of the power storage unit, for each of said plurality voltage conversion units, and said current target value is decided based on predetermined charge/discharge characteristic indicating correspondence between a current value and a voltage value of the power storage unit in accordance with the temperature of the power storage unit, such that the voltage value of the power storage unit is not lower than a prescribed voltage lower limit value.
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27. A method of controlling a power supply system including a plurality of power storage units each configured to be capable of charge/discharge, a power line configured to allow supply/reception of electric power between a load device and said power supply system, and a plurality of voltage conversion units provided between said plurality of power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit and said power line, each of said plurality of voltage conversion units being set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation, comprising the steps of:
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obtaining temperatures of said plurality of power storage units; determining whether each of obtained temperatures of said plurality of power storage units is lower than a corresponding temperature lower limit value; setting one of said plurality of voltage conversion units, corresponding to said power storage unit of which temperature has been determined as lower than said temperature lower limit value, to said current control mode, and setting remaining said voltage conversion units to said voltage control mode; and setting said plurality of voltage conversion units to either of said current control mode or said voltage control mode, if it is determined that said power storage unit of which temperature is lower than said temperature lower limit value does not exist, wherein said current target value in said current control mode is set in accordance with the obtained temperature of the power storage unit, for each of said plurality voltage conversion units, and said current target value is decided based on predetermined charge/discharge characteristic indicating correspondence between a current value and a voltage value of the power storage unit in accordance with the temperature of the power storage unit, such that the voltage value of the power storage unit is not lower than a prescribed voltage lower limit value.
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28. A vehicle comprising:
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a power supply system having a plurality of power storage units each configured to be capable of charge/discharge; and a drive force generation unit generating drive force by receiving electric power supplied from said power supply system;
whereinsaid power supply system includes a power line configured to allow supply/reception of electric power between said drive force generation unit and said power supply system, a plurality of voltage conversion units provided between said plurality of power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit and said power line, and a control device, each of said plurality of voltage conversion units is set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation, and said control device obtains temperatures of said plurality of power storage units, determines whether each of obtained temperatures of said plurality of power storage units is lower than a corresponding temperature lower limit value, and sets one of said voltage conversion unit, corresponding to said power storage unit of which temperature has been determined as lower than said temperature lower limit value, to said current control mode, and sets remaining said voltage conversion units to said voltage control mode, and sets said plurality of voltage conversion units to either of said current control mode or said voltage control mode, if it is determined that said power storage unit of which temperature is lower than said temperature lower limit value does not exist, wherein said current target value in said current control mode is set in accordance with the obtained temperature of the power storage unit, for each of said plurality of voltage conversion units, and said current target value is decided based on predetermined charge/discharge characteristic indicating correspondence between a current value and a voltage value of power storage unit in accordance with the temperature of the power storage unit, such that the voltage value of the power storage unit is not lower than a prescribed voltage lower limit value.
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29. A method of controlling a vehicle, said vehicle including a power supply system having a plurality of power storage units each configured to be capable of charge/discharge and a drive force generation unit generating drive force by receiving electric power supplied from said power supply system, said power supply system including a power line configured to allow supply/reception of electric power between said drive force generation unit and said power supply system and a plurality of voltage conversion units provided between said plurality of power storage units and said power line and each performing a voltage conversion operation between a corresponding power storage unit and said power line, each of said plurality of voltage conversion units being set to any one of a voltage control mode in which a voltage value of said power line is controlled to attain a voltage target value and a current control mode in which a current value of said corresponding power storage unit is controlled to attain a current target value, to perform said voltage conversion operation, comprising the steps of:
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obtaining temperatures of said plurality of power storage units; determining whether each of obtained temperatures of said plurality of power storage units is lower than a corresponding temperature lower limit value; setting one of said voltage conversion units, corresponding to said power storage unit of which temperature has been determined as lower than said temperature lower limit value, to said current control mode, and setting remaining said voltage conversion units to said voltage control mode; and setting said plurality of voltage conversion units to either of said current control mode or said voltage control mode, if it is determined that said power storage unit of which temperature is lower than said temperature lower limit value does not exist, wherein said current target value in said current control mode is set in accordance with the obtained temperature of the power storage unit, for each of said plurality of voltage conversion units, and said current target value is decided based on predetermined charge/discharge characteristic indicating correspondence between a current value and a voltage value of power storage unit in accordance with the temperature of the power storage unit, such that the voltage value of the power storage unit is not lower than a prescribed voltage lower limit value.
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Specification