Patent ID: 8739613
Filing Date: 2014-06-03
Classification: F02D,G01M

Abstract:
1. A method of detecting misfire in an internal combustion engine, the engine having a plurality of cylinders, a corresponding plurality of pistons, and a shaft operatively connected to the plurality of pistons, the shaft having a longitudinal axis about which the shaft rotates, the method comprising: sensing a temporal signature of a lateral displacement of the engine via an acceleration sensor, the acceleration sensor sensing the lateral displacement in at least one direction, the at least one direction being non-parallel relative to the longitudinal axis of the shaft, the acceleration sensor being connected to a control unit, the temporal signature being decomposable into a plurality of frequencies, associated magnitudes, and associated phase angles, each of the plurality of frequencies being associated with a corresponding one of a plurality of orders of the engine; sending a signal corresponding to the temporal signature of the lateral displacement from the acceleration sensor to the control unit; processing the signal with the control unit, the processing comprising: