Misfire detection in an internal combustion engine

摘要

The method involves measuring crankshaft acceleration corresp to each of a number of consecutive cylinder events during operation of the engine. Further it requires selecting a cylinder event corresponding to an instant for which gross engine acceleration is to be determined. Subsequently it entails assigning the gross engine acceleration a value equal to an offset median acceleration over a series of the cylinder events including the selected cylinder event. The series has a true median value, while the offset median acceleration corresp to a crankshaft acceleration measurement having a next greater value than the true median value.