Fractional depletion estimation for battery condition metrics
First Claim
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1. A computer-implemented method of evaluating a battery state comprising:
- collecting, by a battery monitor that is coupled to an industrial vehicle battery, samples recorded by the battery monitor during use of an industrial vehicle, wherein the battery monitor has a processor coupled to at least one sensor to sample battery current, the samples are recorded at a predetermined sampling interval, and the samples represent a measure of a magnitude of a current discharged from a battery powering the industrial vehicle, thus creating a time-based history of a load on the battery during operation of the industrial vehicle;
sorting, by a processor of the industrial vehicle, each collected sample into a corresponding bin, where each bin is associated with a value based on the magnitude of the current samples sorted into that bin, and each bin is stored in memory on the industrial vehicle that is accessible by the processor of the industrial vehicle;
creating, by the processor of the industrial vehicle, a battery use estimate for each bin by multiplying a number of samples sorted into the bin by the value of the bin, and the sampling interval;
determining, by the processor on the industrial vehicle, for each bin, a fractional depletion contribution of the battery by computing a quotient where the quotient is computed by dividing a lifetime expected estimate for that bin by the battery use estimate for that bin;
generating, by the processor on the industrial vehicle, a depletion estimate associated with the state of the battery based upon an accumulation of the fractional depletion contributions; and
outputting a measure of the battery state based upon the generated depletion estimate.
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Abstract
Evaluation of a battery state comprises transforming a time based history of the load on the battery into a spectral representation of that history in a load domain, e.g., the current domain. The method also comprises comparing the spectral representation to an expected battery capability for the load represented by each line in the spectra and calculating the fraction of the expected capability used at each spectral line. The method still further comprises aggregating the calculated fractions into a total fraction that represents the estimated fraction of the expected battery capability associated with that particular time history.
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15 Claims
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1. A computer-implemented method of evaluating a battery state comprising:
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collecting, by a battery monitor that is coupled to an industrial vehicle battery, samples recorded by the battery monitor during use of an industrial vehicle, wherein the battery monitor has a processor coupled to at least one sensor to sample battery current, the samples are recorded at a predetermined sampling interval, and the samples represent a measure of a magnitude of a current discharged from a battery powering the industrial vehicle, thus creating a time-based history of a load on the battery during operation of the industrial vehicle; sorting, by a processor of the industrial vehicle, each collected sample into a corresponding bin, where each bin is associated with a value based on the magnitude of the current samples sorted into that bin, and each bin is stored in memory on the industrial vehicle that is accessible by the processor of the industrial vehicle; creating, by the processor of the industrial vehicle, a battery use estimate for each bin by multiplying a number of samples sorted into the bin by the value of the bin, and the sampling interval; determining, by the processor on the industrial vehicle, for each bin, a fractional depletion contribution of the battery by computing a quotient where the quotient is computed by dividing a lifetime expected estimate for that bin by the battery use estimate for that bin; generating, by the processor on the industrial vehicle, a depletion estimate associated with the state of the battery based upon an accumulation of the fractional depletion contributions; and outputting a measure of the battery state based upon the generated depletion estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification