Ah counting is not a satisfactory method for the estimation of the state of charge (SOC) of a battery, as the initial SOC and coulomb efficiency are difficult to measure. To address this issue, an equivalent coulomb efficiency is defined and a new SOC estimation method, denoted as 'KalmanAh', is proposed. This method uses the Kalman filtering method to correct for the initial value used in the Ah counting method. A Ni/MH battery test, consisting of 8.08 continuous federal urban driving schedule (FUDS) cycles, is carried out to verify the method. The approximate initial SOC of the battery pack is given, and the EKF approach based on the single-variable battery model is used to make the initial SOC converge to its real value. The SOC estimation error is 2.5 % when compared with the real SOC obtained from a discharge test. This compares favorably with an estimation error of 11.4 % when using Ah counting.
Combined state of charge estimator for electric vehicle battery pack
Kombiniertes Ladungszustand-Schätzsystem für das Batteriepaket in Elektrofahrzeugen
Control Engineering Practice ; 15 , 12 ; 1569-1576
2007
8 Seiten, 7 Bilder, 1 Tabelle, 16 Quellen
Aufsatz (Zeitschrift)
Englisch
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