To suppress a lack of fuel amount to be supplied to a combustion chamber when an operating state of an engine applied with twin injectors suddenly changes.
A device 100 includes a storing means 62 for storing a map 71 for determining a corresponding relation of the operating state of the engine with injection ratio of a first injector 41 and a second injector 42, an injection ratio setting means 63 for successively setting the injection ratio of the first injector 41 as a first set value INJ1_RSET and the injection ratio of the second injector 42 as a second set value INJ2_RSET with reference to the map 71, and an injection ratio correcting means 64 for correcting the first set value INJ1_RSET to be increased above the injection ratio of the first injector 41 (1-INJ2_RMAP) derived from the map 71, when a condition is met in which the injection ratio of the second injector 42 successively read from the map 71 is significantly increased above a predetermined determination reference ratio.
KAI SEIICHI
NORO MASAKAZU
MASUDA TETSUYA
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