Spark plug works in the cylinder with strong noise. The unexpected gap of spark plug is an important cause of engine carbon deposition and power insufficiency. Monitoring method based on traditional technology is inaccurate. Wavelet threshold was used for the engine ignition secondary waveform signal de - noising, and the extract characteristic curve was used as the input of BP neural network. The neural network was trained repeatedly to obtain the optimal network parameters. The corresponding relation between the characteristic curve and the gap of spark plug was identified by the neural netw...
