Pb battery has become to be used for the power source of electric vehicle, because of its long life and low cost among the other kinds of batteries. In this case, the range of the vehicle is not so long and the number of charging stations is limited. Thus, in order to predict the residual range, it is necessary to estimate the dischargable value for Pb battery. The open voltage of Pb battery can be used to obtain the above estimated value. Generally, to measure the precise open voltage, it takes much time after cutting the circuit to interrupt discharge.
In this paper, we first explain the experimental system which simulates the electric vehicle and Pb battery discharge. Then, we propose the prediction method of the open voltage by adaptive digital filter (ADF), which enables us to get the predicted value continuously while driving electric vehicle. Based on the predicted value, we propose the method to estimate the residual Wh values. Finally, we apply the present method for experimental real data to show the effectiveness of the approach.
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