| 摘要 |
PROBLEM TO BE SOLVED: To provide an estimation method of chargeing state of a battery with high precision, considering individual differences of each battery, and provide state of charging battery with a high precision wherein the individual difference of every battery is considerect, and provide a control method of charging state of a suitable battery for idle stop/start and regenerative charging of vehicle system. SOLUTION: As for the charging state of the battery of a closed circuit state, a map of current, voltage, deterioration degree, charging state in a standard cell is prepared, and measurements or assumptions of the value of current, voltage and deterioration degree are made in the battery to which attention is paid to obtain the charging state while these are corresponded to the map. In addition, also in the judgment whether this is in the range of the charging state necessary for the idle stop/start and the regenerative charging, the correction of internal resistance is carried out and the estimation of the accurate discharge potential is made, and the battery is controlled to maintain a necessary charging state.
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