KE-Motronic
Knocking combustion due to too early ignition damages the engine. The consequence is overheating, damage to bearings and pistons. On the other hand, engine power output will be highest when the ignition timing is as early as possible, i.e. almost on the edge of detonation. This detonation limit is determined by many factors: the quality of the fuel, the presence of carbon deposits in the combustion chamber, etc.). so that it can be accurately determined, therefore, a sufficiently large safety interval is needed with a normal ignition adjustment, or a sensor that determines whether the knocking combustion has been rocked, i.e. knock adjustment.
Knock sensor
This sensor contains a piece of piezoceramic - a substance that is used to ignite gas in piezo lighters. Mechanical force (stretching, compression), acting on the piezoceramic causes the formation of an electrical voltage. The uneven oscillations that occur during detonation combustion are sufficient to excite the sensor.
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