Method for processing a signal from a knocking sensor of an internal combustion engine allows flexible adaptation of knocking signal sampling frequency to engine operating conditions that can be applied to different engine types

摘要

Method has the following steps: fixing of a signal analysis window based on engine state; sampling of the sensor signal within the window at a given sampling frequency; and application of a Fourier transform to the sample valves. Also the sampling frequency is adjusted prior to a normal engine operating state to a range of frequencies corresponding to a knocking event and the output signal is calculated, in a control operation for different sampling frequencies, with the sampling frequency during normal operation adjusted to the value for which the output signal is a maximum.