METHOD AND SYSTEM FOR DIAGNOSING MISFIRING OF SINGLE-CYLINDER FOUR-STROKE ENGINE

摘要

Disclosed are a method and apparatus for diagnosing misfiring of a single-cylinder four-stroke engine. According to an embodiment of the present invention, the method of the present invention comprises: a data collection step of collecting signal data output by a crankshaft position sensor during two engine cycles; a discrete Fourier transform step of applying a discrete Fourier transform to the signal data during the two engine cycles collected in the data collection step to quantify the same in a frequency form; a PSD calculation step of calculating a power spectrum density (PSD) from frequency data converted in the discrete Fourier transform step; and a misfiring diagnosis step of analyzing a harmonic order value exhibiting a maximum value of the PSD calculated in the PSD calculation step to diagnose whether the misfiring occurs. According to the present invention, the misfiring can be simply and accurately diagnosed and detected.;COPYRIGHT KIPO 2020