초록 ▼

A method and system for detecting engine misfire in an internal combustion engine. A data signal containing a plurality of groups of data points generated from sampling crankshaft rotational displacement over three predetermined angular sampling windows is generated. Each of the plurality of groups

A method and system for detecting engine misfire in an internal combustion engine. A data signal containing a plurality of groups of data points generated from sampling crankshaft rotational displacement over three predetermined angular sampling windows is generated. Each of the plurality of groups of sampled data points represents a cylinder firing event. The data signal is conditioned, and the plurality of groups of sampled data points are mapped into single misfire detection data points. The mapped single misfire detection points are then compared to a misfire detection dynamic threshold, and a misfire detection signal is output if the misfire detection points fall outside the dynamic threshold. The misfire detection system achieves high degree of accuracy through a multi-stage signal conditioning, multi-rate signal processing and statistical decision technology and a mixed size of window sampling strategy, and is capable of being installed on a large scale in motor vehicles through use of existing onboard automotive microcontroller technology.

대표청구항 ▼

[ What is claimed is:] [1.] A computer-implemented method of detecting misfire of an internal combustion engine, said engine including a plurality of cylinders and a crankshaft, said crankshaft having an angular velocity, comprising the steps of:sensing for two firings of one of said cylinders the a

[ What is claimed is:] [1.] A computer-implemented method of detecting misfire of an internal combustion engine, said engine including a plurality of cylinders and a crankshaft, said crankshaft having an angular velocity, comprising the steps of:sensing for two firings of one of said cylinders the angular velocity of the crankshaft;generating a data signal containing a plurality of groups of sampled data points, each of said plurality of groups of sampled data points representing a sensed crankshaft angular velocity for a particular cylinder firing event;mapping each group of said plurality of groups of sampled data points into a single data point based upon a predetermined firing criteria;determining a misfire detection dynamic threshold based upon firing signature signals of said engine;comparing said mapped data point to said misfire detection dynamic threshold; andoutputting a misfire detection signal if said mapped data point does not satisfy said dynamic threshold, said outputted misfire detection signal being indicative of a misfire of said engine.