Patent ID: 7673615
Filing Date: 2010-03-09
Classification: F02D,G01L,G01M

Abstract:
1. A knock determination device for an internal combustion engine, comprising: a knock sensor detecting intensity of vibration of said internal combustion engine; and an operation unit; wherein said operation unit detects a waveform of vibration of said internal combustion engine based on the detected intensity, calculates, for each of a predetermined plurality of crank angle ranges, an integrated value integrating the vibration intensity of said waveform, detects an amount of change in said integrated value between ignition cycles, based on a difference between said integrated value and a predetermined value, specifies a predetermined number of crank angle ranges in which the amount of change in said integrated value is larger, among said plurality of crank angle ranges, specifies a crank angle having an intensity higher than the intensity in a neighboring crank angle, in a search range determined with reference to a specified crank angle range, and while a timing at which intensity becomes the highest in a waveform model defined as a reference of vibration in said internal combustion engine is matched with the specified crank angle, based on a result of comparison between the waveform and the waveform model in this state, determines whether knock has occurred in the internal combustion engine or not.