초록 ▼

An improved misfired detection system and method for high data rate engine control systems. A method of detecting misfires of individual cylinder events in an internal combustion engine is disclosed which includes the step of generating a high data rate velocity signal indicative of the torque behav

An improved misfired detection system and method for high data rate engine control systems. A method of detecting misfires of individual cylinder events in an internal combustion engine is disclosed which includes the step of generating a high data rate velocity signal indicative of the torque behavior of the engine. The velocity signal is then filtered and separated into a plurality of non-interlaced homogeneous data sets wherein each of the data sets represents like portions of the internal combustion engine cycle. A median filter is then applied to each of the plurality of non-interlaced homogeneous data sets. In this manner, the data sets are normalized according to the applied recursive median filter and centered about a relative zero. This centering effect allows the signals to be recombined after filtering, thereby monitoring the nature of any deviations present in the signal. A threshold comparison of the resulting signal is then made to determine whether a misfire has occurred.

대표청구항 ▼

[ What is claimed is:] [1.] 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 se

[ What is claimed is:] [1.] 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.