Patent ID: 7334568
Filing Date: 2008-02-26
Classification: F02D,F02P,G01L,Y02T

Abstract:
1. A knock control apparatus for an internal combustion engine, comprising: a knock sensor that detects a vibration of the internal combustion engine; a knock detection filter that extracts signals that fall in a filtering frequency band from among signals output from the knock sensor; a knock determination device that determines whether knocks are occurring based on the signals extracted by the knock detection filter, a result of the determination being used to control an operating state of the internal combustion engine; a plurality of optimal knock frequency detection filters used to filter the signals output from the knock sensor and having mutually different filtering frequency bands; and an optimal knock frequency setting device that sets a center frequency of the filtering frequency band of the knock detection filter to an optimal knock frequency that is determined based on the signals extracted by the optimal knock frequency detection filters.