Patent ID: 7219006
Filing Date: 2007-05-15
Classification: F02D,F02P,G01L

Abstract:
1. A knock determining apparatus for an internal combustion engine, comprising: a sensor outputting a waveform signal which corresponds to a knock state of the internal combustion engine; and at least one of a first knock determining means, a second knock determining means, and a third knock determining means, for determining the knock state based on a vibration intensity distribution of the waveform signal which is outputted from the sensor during a predetermined number of times of combustions; wherein the first knock determining means includes: the first knock determining means determines the knock state based on a number of times the vibration intensity exceeds the statistical reference level during the predetermined number of times of combustions, the second knock determining means includes: the second knock determining means determines the knock state based on the number of the vibration intensity in each region and/or a ratio of the numbers of the vibration intensity between in each region, and the third knock determining means includes the third knock determining means determines the knock state based on the average of the dispersion index.