Knocking determination device and knocking control device for internal combustion engine

Abstract

Provided are a knocking determination device and a knocking control device for an internal combustion engine, with which a large amount of knocking can be detected quickly and with which knocking is easily determined. A knocking time window and a bandpass filter (BPF) are used (B-B) to extract a knocking frequency waveform signal from a knock sensor signal (Sg), and integration is performed to obtain a first calculated value (B). A reference time window and a BPF are used (B-B) to extract a reference frequency waveform signal from the knock sensor signal (Sg), and integration is performed to obtain a second calculated value (B). The average value of multiple instances of the second calculated value is obtained (B), and the first calculated value is divided by the average value to obtain a signal-to-noise (S/N) ratio (B). A multiplied value is obtained (B) by multiplying the S/N ratio by a weighting coefficient, a moving average value for several of the multiplied values is obtained (), and the moving average is used as a knocking indicator to determine knocking and to perform a control (B-).