Knock control apparatus for internal combustion engine

A knock control apparatus for an internal combustion engine, comprising:

• a knock sensor that detects a vibration caused by a knock of the internal combustion engine;
• a knock signal normalization unit that normalizes a knock signal extracted from an output signal of the knock sensor and obtains the normalized knock signal;
• a knock determination threshold setting unit that sets a knock determination threshold on the basis of the normalized knock signal;
• a knock intensity computation unit that calculates knock intensity on the basis of the normalized knock signal and the set knock determination threshold;
• a knock determination unit that determines a presence or absence of a knock on the basis of the calculated knock intensity;
• and
• a knock correction amount computation unit that calculates a knock correction amount to correct the calculated knock intensity in a case where an occurrence of a knock is determined by the knock determination unit,
• wherein the knock signal normalization unit is configured to obtain the normalized knock signal by normalizing a standard deviation of the knock signal by dividing the extracted knock signal by an average value of the knock signal.