Exhaust manifold pressure based misfire detection for internal combustion engines

A system for identifying a misfire condition of an engine cylinder in an internal combustion engine, comprising:

• at least one pressure sensor operatively coupled to the engine to detect an exhaust manifold pressure (EMP);
• at least one data sensor operatively coupled to the engine to detect one or more characteristics of the engine;
• and
• a control system for the engine having an exhaust gas output, wherein the control system includes a plurality of actuation controllers being in communication with the at least one pressure sensor and the at least one data sensor;
• a data processor of the control system, the data processor structured to:
• receive data sensed by the at least one pressure sensor and the at least one data sensor;
• determine a first process to utilize, wherein the first process is one of an estimated exhaust manifold pressure process (EEMPP) or a centroid projection process (CPP), and wherein the CPP is based, at least in part, on an estimated exhaust manifold pressure;
• utilize the first process to calculate an operating value (OV) based on the received data and a comparative value (CV) associated with a threshold value, wherein the first process is one of an estimated exhaust manifold pressure process (EEMPP) or a centroid projection process (CPP);
• compare the OV and the CV;
• and
• detect a misfire condition for the cylinder based on the comparison of the OV to the CV.

A computer program product stored on a non-transitory computer usable medium for determining a misfire condition of an internal combustion engine having one or more cylinders, comprising, a computer readable program for causing a computer to control an execution of an Application within a memory control device in operable communications with an engine;

• the computer readable program when executed by a computer for:
• determining one or more data input conditions of engine characteristics of the engine;
• comparing a first load variable (FLV) to a first estimated load variable (FELV) for a first cylinder of the engine;
• determining a first process to utilize based on the comparison of the FLV to the FELV, wherein the first process is one of an estimated exhaust manifold pressure process (EEMPP) or a centroid projection process (CPP), wherein the CPP is based, at least in part, on an estimated exhaust manifold pressure;
• using the determined first process to calculate an operating value (OV) based on the 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 based on the comparison of the OV to the CV.

A diesel engine configured to detect an engine cylinder misfire, having logic for:

• comparing a first load variable (FLV) with a first estimated load variable (FELV) for one or more cylinders of the engine;
• determining a first process to utilize that is one of an estimated exhaust manifold pressure process (EEMPP) or a centroid projection process (CPP), wherein the CPP is based, at least in part, on an estimated exhaust manifold pressure;
• using the first process, calculating an operating value (OV) based on one or more data inputs of engine characteristics and a comparative value (CV) associated with a threshold value in response to the determination of the first process to utilize;
• comparing the OV and the CV;
• and
• detecting a misfire condition for the one or more cylinders of the diesel engine based on the comparison of the OV to the CV.