| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection control device which attains high-accuracy injection quantity control by improving a method for calculating a command injection period.SOLUTION: This fuel injection control device is applied to a fuel injection system forcibly feeding fuel to a common rail (accumulator vessel) by a plunger pump, and includes a target injection quantity calculation means calculating a command injection quantity QFIN (target injection quantity) according to the operating condition of an internal combustion engine, a fuel pressure acquisition means S11 acquiring fuel pressure P1 immediately before injection, as rail pressure immediately before injection, command injection period calculation means S17, S18, S19 calculating the command injection period TFIN based on the command injection quantity QFIN and fuel pressure P1 immediately before injection. The command injection period calculation means S17, S18 calculate the command injection period TFIN in consideration of a change in the plunger speed of the plunger pump after acquiring the fuel pressure P1 immediately before injection (S17, S18) when the pressure feed period of the plunger pump and the injection period of a fuel injection valve overlap with each other (S12:YES). |
