| 摘要 |
PROBLEM TO BE SOLVED: To restrain influence by a difference in a specification of a vehicle and a storage battery, by accurately discriminating the deterioration in the storage battery, while reflecting engine startability, by using voltage pulsation when starting an engine. SOLUTION: When discriminating the deterioration in an engine starting storage battery for supplying electric power to an engine starting sel-motor, the deterioration in the storage battery is discriminated by comparing VO with VSn, by measuring storage battery voltage VO just before driving the sel-motor and a voltage bottom value VSn of the (n)th time on and after a second time in storage battery pulsation, by monitoring storage battery voltage pulsation generated when driving the sel-motor. For example, the deterioration is discriminated in response to a differenceΔVn (= VO - VSn) between the VSn and the VO. COPYRIGHT: (C)2008,JPO&INPIT
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