Control device of internal combustion engine

A control device of an internal combustion engine comprising:

• an operation state detecting portion that detects an operation state of the internal combustion engine;
• a combustion control portion that controls a combustion state of the internal combustion engine depending on the detected operation state of the internal combustion engine;
• a vibration sensor that is attached to a cylinder block of the internal combustion engine to detect the vibration of the internal combustion engine;
• a vibration level extraction portion that extracts a vibration level of a predetermined frequency range in the vibration detected by the vibration sensor within a predetermined crank angle range of the internal combustion engine;
• and
• a knock control portion which compares the extracted vibration level to a knock determination value, when it is determined that the vibration level is equal to or greater than the knock determination value, determines that a knock is generated in the internal combustion engine, performs a retard correction of an ignition timing of the internal combustion engine, and suppresses the knock,
• wherein the control device includes
• a filter processing portion that performs a filter processing on the vibration level extracted by the vibration level extraction portion and calculates the vibration level after the filter processing;
• and
• an abnormal ignition suppression control portion which compares the vibration level after the filter processing to the abnormal ignition determination value when the retard correction equal to or greater than a predetermined value is performed by the knock control portion, in a case where it is determined that the vibration level after the filter processing is equal to or greater than the abnormal ignition determination value, determines that the abnormal ignition is generated in the internal combustion engine, corrects and controls the combustion control portion in a direction of suppressing the abnormal ignition.