Patent ID: 6112149
Filing Date: 2000-08-29
Classification: F02B,G01M

Abstract:
A method of detecting misfires associated with individual cylinders of an internal combustion engine comprising the steps of:generating a velocity signal indicative of the torque behavior of said engine, said velocity signal comprising a non-homogeneous interlaced data set;filtering said velocity signal;separating said velocity signal into a plurality of homogeneous non-interlaced data sets wherein each of said data sets represent like portions of the internal combustion engine cycle;applying a median filter to each of said plurality of homogeneous non-interlaced data sets;re-interlacing said plurality of homogeneous non-interlaced data sets to result in a normalized, filtered velocity signal indicative of the torque behavior of said engine; andproviding a misfire indication as a function of said re-interlaced velocity signal.