Engine fuel injection control device

An engine fuel injection control device equipped with a solenoid-type fuel injector, comprising:

• a voltage sensor configured to detect a voltage of a solenoid in the fuel injector;
• and
• a controller configured to derive an attenuation characteristic of a residual voltage of the solenoid in the fuel injector based on a variation of the voltage detected by the voltage sensor, and configured to set a valve-open period of the fuel injector based on an fuel injection amount according to an operation state of the engine, in order to control the fuel injector based on the set valve-open period,
• wherein the controller is configured to estimate the residual voltage at the timing of fuel injection, from the derived attenuation characteristic, and is configured to correct the set valve-open period based on the estimated residual voltage.