Battery state-of-charge estimator

Details Battery state-of-charge estimator Battery state-of-charge estimator

2003-06-25

2008-10-28

Ullah, Akm Enayet (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

C320S132000, C324S427000

Reexamination Certificate

active

07443139

ABSTRACT:
A battery ECU estimates the SOC by integrating the battery current measured by a current sensor, and the battery voltage Vnis measured by a voltage sensor, and the battery temperature Tnis measured by a thermometer if the fluctuation of the charging/discharging current is great. If the number m of estimations of SOCnis m≦10, m is incremented. The battery internal resistance Rnis estimated from the measured battery temperature Tnby using a correlation map showing the correlation between the previously stored battery temperature T and the battery internal resistance R. An estimation charging/discharging current Inis determined using the measured battery voltage Vn,the battery open voltage Vocvn-1determined on the basis of the previously estimated charged state, and the estimated battery internal resistance Rn. The SOCnis estimated by integrating the estimated charging/discharging current In. If the number m of estimations of the SOCnis m=10, the number m of estimations is changed to 0. The charging/discharging current inis measured by a current sensor. The battery internal resistance Rnis calculated from the battery voltage Vnand the charging/discharging current in. The battery temperature Tnis also measured, and the T-R correlation map is corrected

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