Table of contents: KE-Motronic ↓ Knock sensor ↓
KE-Motronic
Detonation combustion due to too early ignition damages the engine. The consequence is overheating, damage to bearings and pistons. On the other hand, the engine's power output will be the highest when the ignition timing is as early as possible, i.e. almost at the detonation limit. This detonation limit is determined by many factors: fuel quality, presence of carbon deposits in the combustion chamber, etc.). In order to be able to determine it accurately, therefore, a sufficiently large safe interval is needed during normal ignition adjustment or a sensor that determines whether detonation combustion has been swung, i.e. detonation adjustment.
Knock sensor
This sensor contains a piece of piezoelectric ceramics, a substance used to ignite gas in piezo lighters. Mechanical force (stretching, compression), acting on the piezoceramics causes the formation of electrical voltage. The uneven oscillations that occur during detonation combustion are sufficient to excite the sensor.