Process for determining the backup time of a battery
First Claim
1. A process for determining the backup time of a battery comprising:
- measuring a voltage at terminals of the battery,measuring a charging or discharging current of the battery,computing a discharge power of the battery from the measured voltage and current, anddetermining a backup time of the battery in terms of the computed discharge power using an estimation process to estimate the discharging of the battery during successive estimated time intervals, said estimation process comprising the steps of, for each estimated time interval, computing an estimated voltage at the terminals of the battery taking account of the computed discharge power and of predetermined parameters characteristic of the battery, comparing the estimated voltage with a minimum discharging voltage of the battery, and summing the successive estimated time intervals, wherein the determined backup time of the battery is equal to the sum of the time intervals obtained when the estimated voltage reaches the minimum discharging voltage.
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Abstract
The backup time of the battery is obtained by estimation, in iterative manner, of discharging of the battery during successive estimated time intervals. During each of the estimated time intervals, an estimated discharging current in terms of the actual discharge power, an estimated voltage, and an estimated state of charge are computed in accordance with a mathematical model equivalent to the battery. The backup time of the battery is equal to the sum of the estimated time intervals necessary for the estimated voltage to reach a preset threshold. The process enables ageing of the battery to be taken into account and an alarm to be provided when the lifetime of the battery becomes too short.
30 Citations
10 Claims
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1. A process for determining the backup time of a battery comprising:
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measuring a voltage at terminals of the battery, measuring a charging or discharging current of the battery, computing a discharge power of the battery from the measured voltage and current, and determining a backup time of the battery in terms of the computed discharge power using an estimation process to estimate the discharging of the battery during successive estimated time intervals, said estimation process comprising the steps of, for each estimated time interval, computing an estimated voltage at the terminals of the battery taking account of the computed discharge power and of predetermined parameters characteristic of the battery, comparing the estimated voltage with a minimum discharging voltage of the battery, and summing the successive estimated time intervals, wherein the determined backup time of the battery is equal to the sum of the time intervals obtained when the estimated voltage reaches the minimum discharging voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification