SPARK IGNITION DIRECT INJECTION ENGINE AND METHOD FOR CONTROLLING THE SAME

PROBLEM TO BE SOLVED: To avoid the generation of torque shock and the deterioration of NVH performance in a spark ignition direct injection engine quickly changing air excessive ratio λ according to engine load.SOLUTION: A controller 100 executes transition control delaying a starting time of fuel injection more than a specific injection period from a final period of a compressing step to a compressing upper dead center such that a main combustion period when the fuel mass ratio of fuel becomes ≥10% and ≤90% is present in an delay angle side more than a specific crank angle time point when intracylinder pressure rising ratio when motoring becomes the negative maximum value while making air excessive ratio when combusting not more than 1, during transition time when an operating state of an engine body (engine 1) changes between a low load area where the air excessive ratio≥λ and a high load area where the air excessive ratio≤1.