On the basis of the principle of statistical pattern recognition and bymeans of the time series of the sound signals of the internal combustion eng-ine, a new method for failure diagnosis of the internal combustion enginehas been developed. Autoregressive coefficients and autoregressive cepstralcoefficients are used as the feature vector of pattern. The relational measureof grey system, the measure of the Mahalanobis distance. and the measure ofdistance of the quantity of information of Kullback-Leiber are employed fordiscriminating the testing pattern to see to which reference pattern it belo...
