| 摘要 |
PROBLEM TO BE SOLVED: To ensure constant and stable combustibility by correcting and controlling a fuel injection ratio corresponding to the air fuel ratio near an ignition plug. SOLUTION: A fuel injection ratio, correcting and controlling part for correcting and controlling a fuel injection ratio, determines the stratified and homogeneous combustion operations by a stratified operation and homogeneous operation determining part on the basis of a speed of rotation of an engine N, the load Acc and a detected value of a water temperature Tw. In the stratified combustion operation, the fuel injection ratio is determined by retrieving a map determining the fuel injection ratio, while using the speed of rotation of the engine N and the load Acc as the parameter to ensure a period when an air fuel ratio near an ignition plug is proper by a crank angle period corresponding to the change width of the required ignition period, and determines the fuel injection ratio for homogeneity in the homogeneous combustion operation. The fuel injection ratio is varied by the variable control of the flow rate measuring part of a fuel injection valve on the basis of the determined fuel injection ratio, a fuel injection pulse width for each combustion operation is determined on the basis of the corrected fuel injection ratio, and the fuel injection amount is controlled on the basis of the fuel injection ratio and the fuel injection pulse width.
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