Knock recognition in internal combustion engines with modifications by changing filter characteristics or cylinder specific changes

Devices and methods for knock detection and knock control are described, in which, in addition to the customary component parts, the knock-detection circuit has a filter with switchable filter characteristic. The switchover of the filter characteristic, i.e. the shift, for example, of the mid-freque...

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Bibliographic Details
Main Authors Franke, Steffen, Sauler, Juergen, Unland, Stefan, Torno, Oskar, Heinstein, Axel, Kluth, Carsten, Haeming, Werner, Baeuerle, Michael
Format Patent
LanguageEnglish
Published 12.02.2004
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Summary:Devices and methods for knock detection and knock control are described, in which, in addition to the customary component parts, the knock-detection circuit has a filter with switchable filter characteristic. The switchover of the filter characteristic, i.e. the shift, for example, of the mid-frequency of the filter, is carried out taking into consideration specifiable quantities or parameters, for instance, as a function of rotational speed. During the switchover of the filter characteristic, i.e. the shift of the mid-frequency, problems could occur in the knock detection; that is why measures are proposed which carry out the knock detection according to a special knock-detection algorithm during a switchover phase lasting a specifiable time.