Internal-combustion-engine combustion state control apparatus

An internal-combustion-engine combustion state control apparatus comprising:

• an ignition controller that generates two or more ignition signals during a single compression stroke or a single combustion stroke of an internal combustion engine;
• an ignition apparatus including
• a high voltage generator that makes an ignition plug, provided in a combustion chamber of the internal combustion engine, generate an ignition discharge based on the ignition signal, and
• an ignition-discharge parameter detection circuit that detects a parameter indicating a state of the ignition discharge;
• an ignition-discharge duration detector that detects two or more ignition discharge durations, which are respective durations of the two or more ignition discharges generated during a single compression stroke or a single combustion stroke of the internal combustion engine based on an output signal of the ignition-discharge parameter detection circuit;
• an abnormal-combustion determiner that diagnoses whether or not abnormal combustion has occurred in the internal combustion engine, based on at least one of the detected two or more ignition discharge durations;
• and
• an abnormal-combustion-suppression controller that controls the internal combustion engine so as to suppress the abnormal combustion, when the abnormal-combustion determiner diagnoses that the abnormal combustion has occurred.