ENGINE CONTROL DEVICE, ENGINE CONTROL SYSTEM, AND ENGINE CONTROL PROGRAM

An engine control device includes: an injection command unit for outputting a fuel injection amount command value; a first calculation unit for outputting a fuel injection amount obtained by FB calculation based on an engine speed deviation to the injection command unit as a basic fuel injection amount; and a second calculation unit for outputting a fuel injection amount obtained by FF calculation based on an engine load at present of an engine to the injection command unit as a FF fuel injection amount. The fuel injection amount command value switches from a fuel injection amount calculated based on the basic fuel injection amount by the injection command unit to a fuel injection amount calculated based on a value obtained by adding the FF fuel injection amount to the basic fuel injection amount, if it is determined that a load application state has occurred in which the engine load before a prescribed time, which is not greater than a prescribed value, increases by not less than a variation threshold.