Electric battery monitoring systems
First Claim
1. A method of monitoring electric battery capacity, comprising in combination:
- effecting evaluation of battery capacity in terms of battery current and battery voltage in a succession of monitoring cycles;
scaling down an influence of said battery current on said evaluation as said succession of monitoring cycles progresses; and
scaling up an influence of said battery voltage on said evaluation as said succession of monitoring cycles progresses.
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Accused Products
Abstract
A method of monitoring electric battery capacity effects evaluation of battery capacity in terms of battery current and battery voltage in a succession of monitoring cycles, scales down an influence of battery current on the evaluation as the succession of monitoring cycles, progresses, and scales up an influence of battery voltage on such evaluation as the succession of monitoring cycles progresses. A similar method effects an assessment of battery capacity during alternating battery discharge operations and battery charging operations over a recurrence of monitoring cycles, detects a decline of attainable battery charge capacity during battery charging operations, and modifies its assessment in response to the detected decline of attainable battery charge capacity. A related method effects evaluation of battery capacity during battery discharges in a succession of monitoring cycles, effects an adjustment of such evaluation of battery capacity in a succession of further monitoring cycles during battery charge restoration between battery discharges, and effects a modification of the adjustment during a decline of battery charging efficiency in a vicinity of full charge restoration.
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Citations
51 Claims
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1. A method of monitoring electric battery capacity, comprising in combination:
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effecting evaluation of battery capacity in terms of battery current and battery voltage in a succession of monitoring cycles; scaling down an influence of said battery current on said evaluation as said succession of monitoring cycles progresses; and scaling up an influence of said battery voltage on said evaluation as said succession of monitoring cycles progresses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method of monitoring electric battery capacity in a succession of monitoring cycles, comprising in combination:
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effecting an assessment of battery capacity during alternating battery discharge operations and battery charging operations over a recurrence of said monitoring cycles; detecting a decline of attainable battery charge capacity during said battery charging operations; and modifying said assessment in response to said detected decline of attainable battery charge capacity.
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32. A method of monitoring electric battery capacity in a succession of monitoring cycles, comprising in combination:
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effecting an assessment of battery capacity at a start of substantially each monitoring cycle;
reducing said assessment in proportion to battery power withdrawal during substantially each monitoring cycle;generating over said monitoring cycles a decreasing first scale factor proportional to withdrawal of battery power since an initial monitoring cycle relative to an initial battery capacity; effecting a first modification of said reduced assessment by said first scale factor during substantially each monitoring cycle; generating a product of a battery current and a time derivative of battery voltage during substantially each monitoring cycle; generating over said monitoring cycles a varying second scale factor proportional to a proximity of battery voltage to a terminal battery voltage; effecting a second modification of said time derivative by said second scale factor during substantially each monitoring cycle; and calculating available battery capacity from said effected first and second modifications. - View Dependent Claims (33, 34, 35, 36, 37)
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38. A method of monitoring electric battery capacity, comprising in combination:
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effecting evaluation of battery capacity during battery discharges in a succession of monitoring cycles; effecting an adjustment of said evaluation of battery capacity in a succession of further monitoring cycles during battery charge restoration between battery discharges; and effecting a modification of said adjustment during a decline of battery charging efficiency in a vicinity of full charge restoration. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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Specification