Knock in spark-ignition engines has been the subject of much research and debate. Although the exact mechanisms involved are still not fully understood, the effects of knock are well known. At low engine speed an unpleasant sound is emitted by the engine block, but engine damage does not normally ensue. By contrast, at high engine speed the sound of knock is usually inaudible, but often a short duration of knock lead to pre-ignition, and severe engine damage can occur. A method for the detection of knock using the sparking plug, and a system which allows the basic nature of the signal from the spark plug to be compared directly with that from an accelerometer are described. Results are presented for a range of engine speeds which highlight the problems and benefits of each sensing technique.
Knock detection alternatives for production vehicles
Alternativen zur Erkennung von Klopfen bei der Fahrzeugfertigung
Vehicle condition monitoring and fault diagnosis. IMechE Conf. ; 85-2 , Mar ; 49-56
1985
8 Seiten, 8 Bilder, 13 Quellen
Aufsatz (Konferenz)
Englisch
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