Presented in the paper is a method for extracting the angular velocity variation of an IC engine from the exhaust pressure.pulsations. The method is based on the so-called parametric (model-based) spectral estimation, and is capable of detecting a narrow-band, time-dependent frequency variation in a signal using only several signal samples at a time.
The procedure developed is demonstrated by application to data recorded on two Diesel engines, whereby the rotational speed variation was also measured. The respective angular velocity variations were extracted from the records of pressure pulsations in the exhaust systems of the two engines, and then compared with the measured ones. Very good accuracy was achieved in both cases.
The method can also be used for special spectral analysae of short signals, where the application of FFT-based spectral estimation would result in a very coarse frequency resolution.
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Datum:
09.03.2015.
