Fuel injection device

A fuel injection device for an engine to perform premixed charge compression ignition combustion, comprising:

• a fuel injection valve configured to inject fuel into a combustion chamber of the engine;
• and
• a controller coupled to the fuel injection valve and operating the fuel injection valve to inject the fuel in multiple separate injections,
• wherein the controller controls a timing of a first fuel injection by the fuel injection valve to carry out the first fuel injection on the retard side with respect to a timing when a premix duration immediately after the first fuel injection is minimum, and controls a timing of a second fuel injection by the fuel injection valve in such a manner that a heat release rate waveform produced by the first fuel injection and the second fuel injection carried out thereafter has a double-peaked shape.