Control apparatus of internal combustion engine

摘要

A vibration waveform of a knock-specific frequency component of an internal combustion engine is calculated over a plurality of ignition cycles of the internal combustion engine according to an output of a knock sensor and an output of a crank angle sensor. An actual ignition timing is calculated by detecting a position corresponding to a crank angle at which a standard deviation of the vibration waveform exceeds a predetermined first determination level as a vibration position by combustion of the internal combustion engine.

主权项

1. A control apparatus of an internal combustion engine, comprising:
a knock sensor that detects a vibration of the internal combustion engine and generates an output containing a signal corresponding to the detected vibration; a crank angle sensor that detects a crank angle of the internal combustion engine and outputs a signal corresponding to the detected crank angle; a vibration waveform calculation unit that calculates a vibration waveform of a knock-specific frequency component of the internal combustion engine obtained from vibration intensity values gathered in a plurality of ignition cycles of the internal combustion engine according to the output of the knock sensor and the output of the crank angle sensor; a vibration waveform standard deviation calculation unit that calculates a standard deviation of the calculated vibration waveform obtained from the plurality of ignition cycles; a vibration position detection unit that detects, as a vibration position by combustion of the internal combustion engine, a position corresponding to the crank angle at which the calculated standard deviation of the vibration waveform exceeds a predetermined first determination level; an actual ignition timing calculation unit that calculates an actual ignition timing of the internal combustion engine according to the detected vibration position; and an ignition timing adjustment unit that is capable of adjusting an ignition timing of the internal combustion engine according to the calculated actual ignition timing.