Secondary Battery Control Apparatus and Secondary Battery Control Method
First Claim
1. An apparatus for controlling a secondary battery, comprising:
- a motor driving circuit receiving supply of electric power from a secondary battery to drive a motor;
battery temperature obtaining means for detecting or estimating a battery temperature of said secondary battery; and
a control circuit controlling said motor driving circuit such that output torque of said motor conforms to requested torque, whereinsaid control circuit includesfirst control means for operating said motor at a first operation point that requires a motor driving current of a first current amplitude for generating said requested torque,second control means for operating said motor at a second operation point that requires a motor driving current of a second current amplitude greater than said first current amplitude for generating said requested torque, andswitching means for alternately switching between said first control means and said second control means for execution, when said battery temperature is lower than a prescribed threshold temperature.
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Accused Products
Abstract
When it is determined that a battery temperature is lower than a threshold value, an inverter control circuit alternately switches an operation point of an AC motor between an optimum operation point and a motor loss increase point. At the motor loss increase point, an increase in the amplitude of the motor current increases copper loss occurring in the three-phase coil of the AC motor. On the other hand, at the optimum operation point, a reduction in the amplitude of the motor current reduces copper loss. Corresponding to the cyclical increase/reduction in the copper loss, the battery is cyclically charged/discharged by the electric power corresponding to the copper loss. The change in the battery current occurred by the charge/discharge causes the internal resistance to generate heat, whereby the temperature of the battery is increased. The foregoing temperature increase operation is prohibited when the motor temperature exceeds an allowable temperature with which the operation efficiency of the AC motor is ensured.
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Citations
16 Claims
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1. An apparatus for controlling a secondary battery, comprising:
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a motor driving circuit receiving supply of electric power from a secondary battery to drive a motor; battery temperature obtaining means for detecting or estimating a battery temperature of said secondary battery; and a control circuit controlling said motor driving circuit such that output torque of said motor conforms to requested torque, wherein said control circuit includes first control means for operating said motor at a first operation point that requires a motor driving current of a first current amplitude for generating said requested torque, second control means for operating said motor at a second operation point that requires a motor driving current of a second current amplitude greater than said first current amplitude for generating said requested torque, and switching means for alternately switching between said first control means and said second control means for execution, when said battery temperature is lower than a prescribed threshold temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of controlling a secondary battery supplying electric power to a motor driving circuit driving a motor, comprising:
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a battery temperature obtaining step of detecting or estimating a battery temperature of said secondary battery, and a driving control step of controlling said motor driving circuit such that output torque of said motors conforms to requested torque, wherein said driving control step includes a first control step of operating said motor at a first operation point that requires a motor driving current of a first current amplitude for generating said requested torque, a second control step of operating said motor at a second operation point that requires a motor driving current of a second current amplitude greater than said first current amplitude for generating said requested torque, and a switching step of switching between said first control step and said second control step for execution, when said battery temperature is lower than a prescribed threshold temperature. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification