Method for accurate battery run time estimation utilizing adaptive offset values
First Claim
1. A method for accurately estimating a run time of a battery, the method comprising:
- calibrating offset values in an open-circuit voltage lookup table, a temperature lookup table, and an age lookup table corresponding to said battery;
determining a present charge of said battery utilizing said open-circuit voltage look up table and said temperature look up table;
determining a low-voltage-alarm charge of said battery utilizing a discharge current of said battery and said age lookup table;
utilizing said present charge and said low-voltage-alarm charge to estimate said run time of said battery.
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Abstract
A disclosed method comprises adaptive offset values in an open-circuit voltage lookup table, a temperature lookup table, and an age lookup table, and then determining a present charge of the battery utilizing an open-circuit voltage of the battery and a temperature of the battery, determining a low-voltage-alarm charge of the battery utilizing a discharge current of the battery and an age of the battery, and utilizing the present charge and the low-voltage-alarm charge to estimate the run time of the battery. Utilizing the open-circuit voltage, temperature, and age comprises looking up a present battery capacity, temperature coefficient, and ageing coefficient in lookup tables, and adjusting the present battery capacity, temperature coefficient, and ageing coefficient by the respective offset values adaptive to the battery. Estimating the run time of the battery comprises, in one embodiment, dividing the difference of the present charge and the low-voltage-alarm charge by the discharge current.
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Citations
20 Claims
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1. A method for accurately estimating a run time of a battery, the method comprising:
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calibrating offset values in an open-circuit voltage lookup table, a temperature lookup table, and an age lookup table corresponding to said battery; determining a present charge of said battery utilizing said open-circuit voltage look up table and said temperature look up table; determining a low-voltage-alarm charge of said battery utilizing a discharge current of said battery and said age lookup table; utilizing said present charge and said low-voltage-alarm charge to estimate said run time of said battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for accurately estimating a run time of a battery, the method comprising:
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calibrating offset values in an open-circuit voltage lookup table, and a temperature lookup table corresponding to said battery; determining an open-circuit voltage of said battery; determining a discharge current of said battery; determining a temperature of said battery; utilizing said offset values, said open-circuit voltage, said discharge current, and said temperature to estimate said run time of said battery. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification