Automotive battery state monitor apparatus

Electricity: battery or capacitor charging or discharging – Battery or cell discharging – Regulated discharging

Reexamination Certificate

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Details

C320S104000, C324S424000, C324S425000, C324S426000, C324S427000

Reexamination Certificate

active

10868921

ABSTRACT:
A voltage control apparatus checks a battery voltage when an automotive generator gradually increases its output to be within a predetermined range after temporarily stopping the generator. Then, the battery voltage is picked up to calculate the charge rate. Further, a first charge rate and a first residual capacity of the battery is memorized when the engine is stopped. Periodically, a pseudo-open circuit voltage is checked when a charge/discharge current fits within a predetermined small range while the engine is not running, and a second charge rate calculated based on the checked pseudo-open circuit voltage. A second residual capacity is calculated using the first charge rate, the first residual capacity and the second charge rate.

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Aylor, J. H. et al., “A Battery State-of-Charge Indicator for Electric Wheelchairs”, IEEE Transactions on Industrial Electronics, IEEE Service Center, Piscataway, NJ, vol. 39, No. 5, Oct. 1, 1992, pp. 398-409.

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