Charge/discharge control device and charge/discharge control method for power storage device, and electric-powered vehicle
First Claim
1. A charge/discharge control device for a power storage device mounted on an electric-powered vehicle, comprising:
- first limitation setting means for controlling charge and discharge of said power storage device to limit a charge/discharge power within a limit range from a discharge electric power permissible value to a charge electric power permissible value which are set based on a state of said power storage device; and
second limitation setting means for temporarily permitting a charge/discharge power beyond said limit range of said first limitation setting means, (i) in response to a manipulation of a brake pedal to or beyond a prescribed degree, or (ii) in response to a manipulation of an accelerator pedal to or beyond a prescribed degree,said second limitation setting means including control means for controlling charge and discharge of said power storage device such that an output voltage of said power storage device is maintained within a voltage range from a lower limit voltage to an upper limit voltage.
1 Assignment
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Accused Products
Abstract
A maximum dischargeable current Idmax obtained when electric power output from a battery is increased from a battery current Ib and a battery voltage Vb at present under internal resistance R at present (an operating point 510) until the battery voltage reaches a lower limit voltage Ve (an operating point 520), is shown as follows: Idmax=Ib+(Vb−Ve)/R. Therefore, in accordance with multiplication of the lower limit voltage Ve and the maximum dischargeable current Idmax, it is possible to predict maximum dischargeable electric power at which the battery voltage does not become lower than the lower limit voltage even if discharge limitation is temporarily relaxed, as a relative value with respect to the battery voltage and the battery current at present. When the discharge electric power limitation for the battery (the power storage device) is temporarily relaxed in accordance with a discharge request made by a load, a discharge electric power permissible value is set to correspond to the maximum dischargeable electric power, such that the output voltage of the power storage device does not fall outside a controlled voltage range from the lower limit voltage to an upper limit voltage.
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Citations
31 Claims
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1. A charge/discharge control device for a power storage device mounted on an electric-powered vehicle, comprising:
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first limitation setting means for controlling charge and discharge of said power storage device to limit a charge/discharge power within a limit range from a discharge electric power permissible value to a charge electric power permissible value which are set based on a state of said power storage device; and second limitation setting means for temporarily permitting a charge/discharge power beyond said limit range of said first limitation setting means, (i) in response to a manipulation of a brake pedal to or beyond a prescribed degree, or (ii) in response to a manipulation of an accelerator pedal to or beyond a prescribed degree, said second limitation setting means including control means for controlling charge and discharge of said power storage device such that an output voltage of said power storage device is maintained within a voltage range from a lower limit voltage to an upper limit voltage. - View Dependent Claims (2, 3)
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4. A charge/discharge control method for a power storage device mounted on an electric-powered vehicle, comprising the steps of:
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controlling charge and discharge of said power storage device to limit a charge/discharge power within a limit range from a discharge electric power permissible value to a charge electric power permissible value which are set based on a state of said power storage device; and temporarily permitting a charge/discharge power beyond said limit range of said step of controlling, (i) in response to a manipulation of a brake pedal to or beyond a prescribed degree, or (ii) in response to a manipulation of an accelerator pedal to or beyond a prescribed degree, said step of temporarily permitting including the step of; controlling charge and discharge of said power storage device such that an output voltage of said power storage device is maintained within a voltage range from a lower limit voltage to an upper limit voltage. - View Dependent Claims (5, 6)
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7. An electric-powered vehicle, comprising:
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a power storage device, and a charge/discharge control device for said power storage device, wherein said charge/discharge control device controls charge and discharge of said power storage device to limit a charge/discharge power within a limit range from a discharge electric power permissible value to a charge electric power permissible value which are set based on a state of said power storage device; and temporarily permits a charge/discharge power beyond said limit range, (i) in response to a manipulation of a brake pedal to or beyond a prescribed degree, or (ii) in response to a manipulation of an accelerator pedal to or beyond a prescribed degree, and controls charge and discharge of said power storage device such that an output voltage of said power storage device is maintained within a voltage range from a lower limit voltage to an upper limit voltage, when the charge/discharge power beyond said limit range is temporarily permitted. - View Dependent Claims (8, 9)
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10. A charge/discharge control device for a power storage device, for maintaining an output voltage of the power storage device within a voltage range from a lower limit voltage to an upper limit voltage, comprising:
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state obtaining means for obtaining measurement values which indicate the state of said power storage device; first limitation setting means for setting, based on the state of said power storage device, a discharge electric power permissible value and a charge electric power permissible value for charge/discharge electric power limitation for said power storage device; second limitation setting means for temporarily relaxing said charge/discharge electric power limitation relative to the charge/discharge electric power permissible value set by said first limitation setting means, in accordance with a request from a load of said power storage device, the request from the load being higher than in a normal load state and reflecting (i) a manipulation of a brake pedal to or beyond a prescribed degree or (ii) a manipulation of an accelerator pedal to or beyond a prescribed degree; and internal resistance estimating means for estimating internal resistance of said power storage device, based on said measurement values obtained by said state obtaining means, said second limitation setting means including predicting means for predicting, upon receipt of the request from the load of said power storage device, at least one of discharge electric power and charge electric power of said power storage device at which said output voltage reaches said lower limit voltage and said upper limit voltage owing to increase in discharge electric power and charge electric power, respectively, based on a battery voltage and a battery current in said measurement values obtained by said state obtaining means and said internal resistance estimated by said internal resistance estimating means, and permissible value setting means for temporarily setting at least one of said discharge electric power permissible value and said charge electric power permissible value, in accordance with at least one of said discharge electric power and said charge electric power predicted by said predicting means, wherein the at least one of said discharge electric power permissible value and said charge electric power permissible value temporarily set by the permissible value setting means of the second limitation setting means allows at least one of (i) a greater discharge of electric power than the discharge electric power permissible value set by the first limitation setting means and (ii) a greater charge of electric power than the charge electric power permissible value set by the first limitation setting means. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A charge/discharge control method for a power storage device, for maintaining an output voltage of the power storage device within a voltage range from a lower limit voltage to an upper limit voltage, comprising the steps of:
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obtaining measurement values which indicate a state of said power storage device; setting, based on a state of said power storage device, a discharge electric power permissible value and a charge electric power permissible value for charge/discharge electric power limitation for said power storage device; temporarily relaxing said charge/discharge electric power limitation relative to the charge/discharge electric power permissible value set by said setting step in accordance with a request from a load of said power storage device, the request from the load being higher than in a normal load state and reflecting (i) a manipulation of a brake pedal to or beyond a prescribed degree or (ii) a manipulation of an accelerator pedal to or beyond a prescribed degree; and estimating internal resistance of said power storage device, based on said measurement values obtained by said obtaining step, said relaxing step including the substeps of predicting, upon receipt of the request from the load of said power storage device, at least one of discharge electric power and charge electric power of said power storage device at which said output voltage reaches said lower limit voltage and said upper limit voltage owing to increase in discharge electric power and charge electric power, respectively, based on a battery voltage and a battery current in said measurement values obtained by said obtaining step and said internal resistance estimated by said estimating step, and temporarily setting at least one of said discharge electric power permissible value and said charge electric power permissible value, in accordance with at least one of said discharge electric power and said charge electric power predicted by said predicting substep, wherein the at least one of said discharge electric power permissible value and said charge electric power permissible value temporarily set by the relaxing step allows at least one of (i) a greater discharge of electric power than the discharge electric power permissible value set by the setting step and (ii) a greater charge of electric power than the charge electric power permissible value set by the setting step. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. A charge/discharge control device for a power storage device, for maintaining an output voltage of the power storage device within a voltage range from a lower limit voltage to an upper limit voltage, comprising a controller that performs the steps of:
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obtaining measurement values which indicate a state of said power storage device; setting, based on a state of said power storage device, a discharge electric power permissible value and a charge electric power permissible value for charge/discharge electric power limitation for said power storage device; temporarily relaxing said charge/discharge electric power limitation relative to the charge/discharge electric power permissible value set by said setting step in accordance with a request from a load of said power storage device, the request from the load being higher than in a normal load state and reflecting (i) a manipulation of a brake pedal to or beyond a prescribed degree or (ii) a manipulation of an accelerator pedal to or beyond a prescribed degree; and estimating internal resistance of said power storage device, based on said measurement values obtained by said obtaining step, said relaxing step including the substeps of predicting, upon receipt of the request from the load of said power storage device, at least one of discharge electric power and charge electric power of said power storage device at which said output voltage reaches said lower limit voltage and said upper limit voltage owing to increase in discharge electric power and charge electric power, respectively, based on a battery voltage and a battery current in said measurement values obtained by said obtaining step and said internal resistance estimated by said estimating step, and temporarily setting at least one of said discharge electric power permissible value and said charge electric power permissible value, in accordance with at least one of said discharge electric power and said charge electric power predicted by said predicting substep, wherein the at least one of said discharge electric power permissible value and said charge electric power permissible value temporarily set by the relaxing step allows at least one of (i) a greater discharge of electric power than the discharge electric power permissible value set by the setting step and (ii) a greater charge of electric power than the charge electric power permissible value set by the setting step. - View Dependent Claims (29, 30, 31)
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Specification