EXHAUST MANIFOLD PRESSURE BASED MISFIRE DETECTION FOR INTERNAL COMBUSTION ENGINES

摘要

An engine cylinder misfire detection system is provided that detects changes in exhaust manifold pressure (EMP) fluctuations, compares the EMP fluctuations with diagnostic thresholds determined with other engine characteristic information obtained from engine sensor data, and determines whether a cylinder misfire has occurred. A method of monitoring and detecting EMP fluctuations in combination with one or more sensed engine characteristics is disclosed to determine an engine cylinder misfire in a cycle of an internal combustion engine having at least one cylinder. The actuation approaches of the present invention include one or more processes for a cylinder of an engine associated with a determination of various load variables including fresh air flow, engine type, engine data inputs, and analytical determinants.

主权项

1. A method for detecting an engine cylinder misfire in an internal combustion engine having at least one cylinder, comprising:
comparing a first load variable (FLV) with a first estimated load variable (FELV) for a first cylinder of the engine and initiating a first process; measuring an exhaust manifold pressure (EMP), using the first process, calculating an operating value (OV) in relation to one or more data inputs of engine characteristics and a comparative value (CV) associated with a threshold value; comparing the OV and the CV, and, detecting a misfire condition for the first cylinder.