Knock control device of internal combustion engine

摘要

In a knock control device of an internal combustion engine equipped with a control unit which updates a background level based on an output signal from a knock sensor and detects the generation of a knock by comparing a variation of the background level with a knock determination value, a determination as to whether the knock is generated is performed by
((variation of first filter value of peak hold value)>((1−filter coefficient)/(1+filter coefficient)×(predetermined value larger than maximum value of variation of peak hold value in case where knock is not generated))).

主权项

1. A knock control device of an internal combustion engine, comprising:
a knock sensor which sends an a vibration waveform signal based on the vibration of said internal combustion engine; and a control unit which updates a background level based on an output signal from said knock sensor, and detects the generation of a knock by comparing a variation of the background level with a knock determination value, wherein, in said control unit, the background level is calculated by primary filter calculation of the output signal from said knock sensor, and when the background level is calculated by
((current background level)=(filter coefficient)×(previous background level)+(1−filter coefficient)×(output signal from knock sensor)),((1−filter coefficient)/(1+filter coefficient)×(value not lower than maximum value of variation of output signal from knock sensor in case where knock is not generated))is regarded as the knock determination value.