基于快速傅立叶变换的发动机点火波形分析

Engine Ignition Waveform Analysis Based on Fast Fourier Transform

利用插值和快速傅立叶变换FFT,将发动机点火时域波形变换成频域的功率谱PSD,以从频率的角度来分析点火波形.提出了一种基于FFT变换的发动机点火波形分析方法,并给出充分的理论基础.结合两个具体实例说明该方法为时域波形分析提供了很好的补充,从而能更准确地对发动机进行故障判别.

Adopting interpolation and fast Fourier transform, this paper transfers ignition time domain waveform into power spectrum density in the frequency domain and analyzes ignition waveform in the viewpoint of frequency. An analytical method of engine ignition waveform based on fast Fourier transform is presented together with its theoretical principle. The method provides a good supplement for time domain analysis of ignition waveform and makes engine fault diagnosis more accurate. It is illustrated by two examples.