| 摘要 |
A fuel injection control apparatus of an internal combustion engine capable of sufficiently reducing the amount of smoke generated while securing favorable ignition of fuel injected in main injection is provided. It is determined whether an injection time of the pilot injection is in a first region on an angle of delay side or a second region on an angle of advance side based on an engine load and an engine speed. In case of the first region, an ignition delay period of fuel injected in the main injection is obtained while changing the injection time of the pilot injection, and a pilot injection time at which the ignition delay period is the greatest is determined as a target pilot injection time. In the case of the second region, an angle of overlap between a spray in the pilot injection and a spray in the main injection is calculated while changing the injection time of the pilot injection, and a pilot injection time at which the angle of overlap is the smallest is determined as the target pilot injection time. |
