Vehicle power supply device and its degradation judgment method
First Claim
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1. A vehicle power supply device comprising:
- a capacitor unit including a plurality of capacitors storing auxiliary power;
a temperature sensor detecting a temperature of the capacitor unit;
a charge circuit charging electric power to the capacitor unit;
a capacitor-unit current detector detecting a current value of the capacitor unit;
a capacitor-unit voltage detector detecting a voltage value of the capacitor unit;
a controller electrically connected to the temperature sensor, the charge circuit, the capacitor-unit current detector, and the capacitor-unit voltage detector, the controller obtaining an internal resistance value and a capacitance value of the capacitor unit from the voltage value and the current value;
a storage storing a correction calculation formula and a plurality of degradation determination formulas, the correction calculation formula being used to perform the correction calculation of the internal resistance value and the capacitance value in accordance with the temperature in order to obtain a corrected calculated value of internal resistance and a corrected calculated value of capacitance, and the plurality of degradation determination formulas corresponding to numerical ranges of the corrected calculated value of capacitance and being used to calculate an internal resistance standard value from the corrected calculated value of capacitance; and
a determination unit determining a degradation level of the capacitor unit based on at least one of the internal resistance standard value and the corrected calculated value of capacitance.
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Abstract
A vehicle power supply device has a capacitor unit including capacitors storing auxiliary power; a temperature sensor; a charge circuit; a capacitor-unit current detector; a capacitor-unit voltage detector; a controller; a storage; and a determination unit. The determination unit determines the degradation level of the capacitor unit based on at least one of an internal resistance standard value and a corrected calculated value of capacitance. This structure determines degradation of the vehicle power supply device more accurately than ever, so that the device can be used until the end of the actual life.
15 Citations
11 Claims
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1. A vehicle power supply device comprising:
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a capacitor unit including a plurality of capacitors storing auxiliary power; a temperature sensor detecting a temperature of the capacitor unit; a charge circuit charging electric power to the capacitor unit; a capacitor-unit current detector detecting a current value of the capacitor unit; a capacitor-unit voltage detector detecting a voltage value of the capacitor unit; a controller electrically connected to the temperature sensor, the charge circuit, the capacitor-unit current detector, and the capacitor-unit voltage detector, the controller obtaining an internal resistance value and a capacitance value of the capacitor unit from the voltage value and the current value; a storage storing a correction calculation formula and a plurality of degradation determination formulas, the correction calculation formula being used to perform the correction calculation of the internal resistance value and the capacitance value in accordance with the temperature in order to obtain a corrected calculated value of internal resistance and a corrected calculated value of capacitance, and the plurality of degradation determination formulas corresponding to numerical ranges of the corrected calculated value of capacitance and being used to calculate an internal resistance standard value from the corrected calculated value of capacitance; and a determination unit determining a degradation level of the capacitor unit based on at least one of the internal resistance standard value and the corrected calculated value of capacitance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining degradation of a
vehicle power supply device, the method comprising: -
measuring a temperature of a capacitor unit including a plurality of capacitors storing auxiliary power; acquiring an internal resistance value of the capacitor unit; acquiring a capacitance value of the capacitor unit; acquiring a corrected calculated value of internal resistance and a corrected calculated value of capacitance by having a microprocessor perform a correction calculation of the internal resistance value and the capacitance value in accordance with the temperature; acquiring an internal resistance standard value from the corrected calculated value of capacitance using a plurality of different degradation determination formulas corresponding to numerical ranges of the corrected calculated value of capacitance; and determining a degradation level of the capacitor unit based on at least one of the internal resistance standard value and the corrected calculated value of capacitance. - View Dependent Claims (10, 11)
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Specification