INTERNAL COMBUSTION ENGINE CONTROL DEVICE

Conventionally, detection of the state of a sub-chamber has been impossible unless a sensor is installed near the sub-chamber, preventing appropriate engine control.An ECU 20 includes: a jet intensity estimating unit 51 for estimating the intensity of a flame jet by means of at least one of a primary current, a primary voltage, a secondary current, and a secondary voltage of an ignition device which is attached inside a sub-combustion chamber, injects into a main combustion chamber a flame jet generated by ignition of an air-fuel mixture inside the sub-combustion chamber, and supplies a secondary current to an ignition plug for igniting the air-fuel mixture in the main combustion chamber; and an engine control unit 52 which controls an internal combustion engine on the basis of a combustion state inside the sub-combustion chamber determined from the estimated intensity of the flame jet.