Internal Combustion Engine Control Unit

Provided is an internal combustion engine control unit that controls an engine by detecting combustion characteristics with a simple configuration robust to disturbance such as noise. Therefore, the internal combustion engine control unit (ECU ) of the present embodiment includes a rotational speed calculation unit that calculates a crank rotational speed of an internal combustion engine (engine ); an extreme value timing calculation unit that calculates an extreme value timing of the crank rotational speed calculated by the rotational speed calculation unit ; and a combustion state estimation unit (combustion phase calculation unit ) that estimates a combustion state based on the extreme value timing of the crank speed calculated by the extreme value timing calculation unit