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Gaseous fuels such as natural gas and propane butane mixtures are currently the most popular fuels for dual fuelinternal combustion engines. Gaseous fuels are more resistant to knocking than conventional liquid fuels they mix betterwith air. There have been many published works on the use of gaseous fuels but the problem of the combustion noise, asa very important source of acoustic discomfort is not getting enough attention. Combustion noise occurs in a direct andindirect form. It is transmitted throughout the engine block as a vibration at a different spectrum of frequencies. In thisstudy an attempt has been made to correlate the combustion noise with the operating parameters of an engine fueledwith LPG, CNG and CNG-hydrogen mixtures as compared to petrol fueled engine. Signals of multiple resonance in thecombustion chamber and corresponding vibration signals of the cylinder block of engine have been considered for onecombustion cycle. A four cylinder, 1.6 dm3 spark-ignition engine converted to run on LPG, CNG and CNG-hydrogenmixtures has been tested in the project. A well known diagnostic parameter was used for comparison of the engine noisefor its operation on gasoline and alternative fuels. A new non-dimensional indicator has also been proposed for theengine vibration estimation purposes the Increase Wavelet Ratio C’ab, precisely described in the paper.

On board recognition of different fuels in SI engines with the use of dimensional and non-dimensional vibration signal parameters