| 摘要 |
A method for determining the rotation speed of at least one supercharger which compresses the sucked air in an internal combustion engine; the control method, during the normal operation of the internal combustion engine, comprises the steps of detecting, by means of a microphone, the intensity of a sound signal generated by the rotation of the supercharger; determining a frequency content of the sound signal generated by the rotation of the supercharger; identifying the frequencies with maximum amplitude within the frequency content of the sound signal generated by the rotation of the supercharger; recognising the frequencies with maximum amplitude which are each other's multiples or submultiples; and determining the rotation speed of the supercharger using exclusively the frequencies with maximum amplitude which are each other's multiples or submultiples.
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