INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To optimize feed back correction quantity of each fuel injection valve in a case of feed back correction of fuel injection quantity based on output of a air fuel ratio sensor in an engine including a port injection valve and a cylinder injection valve.

SOLUTION: Air fuel ratio deviationΔAF is calculated by subtracting actual air fuel ratio AF detected by a first air fuel ratio sensor 22 from target air fuel ratio AFEEF. Excess and insufficient fuelΔFI is calculated by dividing intake air quantity QA by air fuel ratio deviationΔAF. Cylinder injection excess and insufficient fuelΔFIC and port injection excess and insufficient fuelΔFIP are calculated by multiplying cylinder injection ratio RC and port injection ratio RP to excess and insufficient fuelΔFI. Cylinder injection feed back gain GC and injection feed back gain GP are determined from a map, and cylinder injection correction quantity FCORRC and port injection correction quantity FCORRP are calculated by multiplying cylinder injection feed back gain GC and injection feed back gain GP to cylinder injection excess and insufficient fuelΔFIC and port injection excess and insufficient fuelΔFIP respectively. Cylinder injection quantity FC and port injection quantity FP are calculated by adding standard cylinder injection quantity FCB and standard port injection quantity FPB to the same.

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