| 摘要 |
PROBLEM TO BE SOLVED: To reduce a fluctuation of torque and deterioration of a combustion condition of an engine caused by a pressure vibration of fuel in a fuel supply system in the case of injecting fuel divided in at least two times by an injector in the vicinity of the top dead center of compression in each cylinder, in a direct injection Diesel engine having a common rail type fuel supply system. SOLUTION: First/second injection timing IT1, IT2 by an injector is set so as to satisfy fuel consumption performance and emission performance by a divided injection control means when an engine is in ordinary operation. A pressure vibration of fuel according to valve opening in the first time of the injector is considered, the second injection timing IT2 is corrected so that a valve opening start intervalΔIT to a start of valve opening in the second time is in the vicinity of almost half periodτ/2 the change periodτof fuel pressure or any one of integer times thereof. A valve opening period from the start of valve opening in the second time to valve closing of the injector may be corrected.
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