| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection device of an internal combustion engine capable of highly accurately updating a correction factor of an area high in use frequency, by dividing an operation state of an engine into a plurality of areas. SOLUTION: A basic fuel injection quantity is determined based on an engine speed Ne and throttle opening Th by referring to a first map 40. A correction variable KBUK corresponding to a present area is read in. A variable KO2 is determined as a feedback correction quantity by the O<SB>2</SB>concentration of an exhaust system so as to approach a predetermined air-fuel ratio. Fuel is injected by determining the final fuel injection quantity by making a correction by the KBUK and the KO2 to the basic fuel injection quantity. A variation quantity to a reference value of the KO2 is transferred to the KBUK at a predetermined rate in a predetermined period, and the KBUK is stored in a nonvolatile storage part. First to tenth areas 70a to 70g are small in an area width in the axial direction of the throttle opening as the throttle opening Th becomes small in the same place Ne1 in the engine speed Ne. COPYRIGHT: (C)2009,JPO&INPIT
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