Detection of misfire and knock in spark ignition engines by wavelet transform of engine block vibration signals

The high-frequency components of engine block vibration signals during misfire and normal combustion show clear differences of duration and scale by wavelet analysis - continuous wavelet transform (CWT). A new factor, combustion noise intensity (`CNICWT'), has been defined, which has been derived from the CWT scalogram. It has been shown that CNICWT can detect misfire more accurately than fast Fourier transform power spectral density. Similarly, it has been found that CNICWT can also be applied to knock detection. The durations of both knock and misfire detection overlapped each other at the same wavelet scale 8; misfire, normal and knock cycles can be indicated on the same histogram by CNICWT. Moreover, knock and misfire detection can be combined to one CNICWT computation.

[1]  Wolfgang Wimmer,et al.  Misfire Detection by Evaluating Crankshaft Speed - A Means to Comply with OBDII , 1993 .

[2]  Yoon Young Kim,et al.  A new damage detection method based on a wavelet transform , 2000 .

[3]  Hisakazu Kikuchi,et al.  Fast nonorthogonal wavelet transforms and reconstructions for detonation detection , 1993, 1993 IEEE International Symposium on Circuits and Systems.

[4]  Zhong Zhang,et al.  A New Diagnostic Method of Knocking in a Spark-Ignition Engine Using the Wavelet Transform , 2000 .

[5]  Kwang Min Chun,et al.  Measurement and Analysis of Knock in a SI Engine Using the Cylinder Pressure and Block Vibration Signals , 1994 .

[6]  권기웅,et al.  피스톤 슬랩에 의한 엔진 진동 현상의 실험적 분석과 예측 방법 = Experimental analysis of piston-slap induced engine vibration and its prediction method , 1993 .

[7]  Rohit S. Paranjpe.  Development of a Math-Based Piston Noise Model , 1998 .

[8]  Jong-hwa Lee,et al.  A New Knock-Detection Method using Cylinder Pressure, Block Vibration and Sound Pressure Signals from a SI Engine , 1998 .

[9]  T. N. Patro.  Combustion Induced Powertrain NVH - A Time-Frequency Analysis , 1997 .

[10]  B. Dubuisson,et al.  A diagnostic method using wavelets networks application to engine knock detection , 1996, 1996 IEEE International Conference on Systems, Man and Cybernetics. Information Intelligence and Systems (Cat. No.96CH35929).

[11]  David James Scholl,et al.  SPECTROGRAM ANALYSIS OF ACCELEROMETER : BASED SPARK KNOCK DETECTION WAVEFORMS , 1997 .

[12]  Edward J. Powers,et al.  Time-frequency analysis of power system disturbance signals for power quality , 1999, 1999 IEEE Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.99CH36364).

[13]  S. Mallat.  A wavelet tour of signal processing , 1998 .