| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection control device that can suppress both of deterioration of smoke and deterioration of combustion noise.SOLUTION: An ECU 36 is configured to control a fuel injection state relative to an engine 10, and includes: target heat generation rate determination means 80 for determining a time transition of a target heat generation rate that prevents combustion noise of the engine 10 from exceeding a target noise level; residual oxygen concentration estimation means 90 for estimating a time transition of a cylinder residual oxygen concentration in a combustion stroke on the assumption that combustion to attain the target heat generation rate is performed, on the basis of an intake oxygen concentration supplied to the engine 10 in an intake stroke and oxygen consumption every time in the combustion stroke; target injection rate determination means 100 for determining a time transition of a target injection rate on the basis of the estimated time transition of the cylinder residual oxygen concentration; and a drive circuit 130 for controlling injection so that a time transition of a fuel injection rate relative to the engine 10 reaches the time transition of the target injection rate.SELECTED DRAWING: Figure 1 |
