| 摘要 |
PROBLEM TO BE SOLVED: To effectively restrain a variation in engine speed immediately after an increase in electric load such as the transition of the electric load from an off-state to an on-state. SOLUTION: A cooling water temperature when an electric fan being the electric load is turned on, is estimated from a vehicle speed. Its estimated water temperature TWb is set as a value smaller by a predetermined quantity than the water temperature when the electric fan actually is turned on. When the actual cooling water temperature TWa reaches the estimated water temperature TWb, that is, before the electric fan actually is turned on, a rotational variation measure (for example, a quantity increase correction of the auction air volume and a fuel injection quantity) for restraining a rotational variation in an engine is performed (Step ST12 to ST15) to be prepared for an increase in a power generation quantity (torque) of an alternator when turning on the electric fan. By performing such a measure, the rotational variation at the transition of the electric fan from an off-state to an on-state can be effectively restrained. COPYRIGHT: (C)2008,JPO&INPIT
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