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AssigneeToyota Jidosha Kabushiki Kaisha
InventorsNobuo Watanabe, Yukio Kuroda, Yoshiaki Kikuchi
Estimating the term…
Means for estimating the charged state of a battery, capable of accurately estimating an SOC even though the battery repeats charging/discharging in short cycles. The charging/discharging current Ib measured by current sensing means (10) is integrated, and pseudo-SOC estimating means estimates a pseudo-SOC. Electromotive force estimating means (16) estimates the open voltage Voc from the pseudo-SOC. Voltage change estimating means (18) estimates the voltage change Vr due to the internal resistance from the charging/discharging current Ib. Dynamic voltage change estimating means (20) estimates the voltage change Vdyn due to the change of the charging/discharging current. An adder (22) adds the Voc, Vr, and Vdyn to calculate an estimated voltage Vest of the battery. SOC correction calculating means (26) calculates the correction of the SOC for equalizing the estimated voltage Vest to the measured voltage Vmes measured by voltage sensing means (12), and an adder (28) adds the correction to the pseudo-SOC to estimate the SOC of the battery.
Means for estimating a state of charge of a battery, comprising a battery model for determining a pseudo-SOC (state of charge) as a temporary value representative of the SOC of the battery and estimating a voltage of the battery by considering the pseudo-SOC and a change in state of the battery, whereby a real SOC is estimated by correcting the pseudo-SOC so that the estimated voltage of the battery is equal to an actually measured voltage of the battery,
A method for estimating the degraded state of battery, comprising the steps of:
Dependencies are inferred from the claim text.