Complementary method for detecting misfires in internal combustion engines.

摘要

Misfiring of individual cylinders in an internal combustion engine is detected based on simultaneous use of two different methods of misfire detection which examine different combustion-related parameters of engine operation, such as crankshaft acceleration and exhaust gas pressure. A complementary detector (57) produces a final misfire determination based on the simultaneously obtained misfire determinations in order to provide greater coverage of the speed-load range of the engine and to provide increased confidence and accuracy in calling misfires in the portion of the speed-load range where both misfire methods are presumed to function. <IMAGE>