| 摘要 |
<p>In order to detect knocking in an engine with spark ignition, the vibration detected at a location of the engine close to the combustion chambers is converted into an electrical signal, with an adjustable amplification coefficient. In the electrical signal there is isolated the energy in at least one high frequency band and one low frequency band of knocking and, in a background noise frequency band which is lower than the said high frequency band, during time slots which are synchronized with the operating cycle of the engine, the amplification coefficient is controlled as a function of the power of the signal in the background noise frequency band and the presence of knocking is detected by comparison between the power level in the background noise band and the power level resulting from a selection between the knocking bands or a combination of these bands. <IMAGE></p> |
