Patent ID: 8914222

Claim:
An electronic control unit for use with an internal combustion engine, the electronic control unit comprising: a sensor sensing one of a vibration and an in-cylinder pressure of the internal combustion engine; a sensor signal amplifier amplifying a sensor signal from the sensor by changing an amplification power of the sensor signal; an A/D converter converting the sensor signal amplified by the sensor signal amplifier to a digital signal; an abnormal combustion detector determining whether an abnormal combustion has occurred based on a characteristic of a waveform of the digital signal from the A/D converter; an abnormal combustion controller performing an abnormal combustion prevention control to prevent the abnormal combustion when the abnormal combustion detector determines that the abnormal combustion has occurred; and an amplification controller setting the amplification power of the sensor signal amplifier based on an amplitude of the digital signal from the A/D converter and a determination result of the abnormal combustion by the abnormal combustion detector.