Patent ID: 7657361

Claim:
A fuel injection control device for diesel engine, wherein the device stores a relationship between a required fuel injection amount and a corresponding injection command signal, the device generates the injection command signal corresponding to the required fuel injection amount based on the stored relationship, and drives injectors based on the injection command signal to inject fuel, the device comprising: a shifting section, which temporarily shifts a fuel injection mode between a first injection mode and a second injection mode to forcibly change the engine rotational speed, the first injection mode being a mode in which an after injection is executed after a main injection, the after injection having less fuel injection amount than the main injection, and the second injection mode being a mode in which the after injection is not executed; and a correction section, which detects variation of the engine rotational speed caused by shifting the fuel injection mode, and corrects the stored relationship between the required fuel injection amount and the injection command signal based on comparison between the detected variation of the engine rotational speed and a previously determined standard variation of the engine rotational speed.