CLK 430 Cabriolet (208.470) V8-4.3L (113.943) (2000)
A16
Knock sensor (other designations A29, A30)
The knock sensor is a self-contained system. Inside the sensor are piezo crystals. The screened cable is fitted directly onto the knock sensor.
Knock Sensors, Function
Knock Sensors, Function
A16
Knock sensor
a
Signal pattern in the case of controlled combustion
b
Signal pattern in the case of uncontrolled combustion (knocking)
c
Oscilloscope
t
Time
U
Electrical voltage
Any vibrations which occur are converted with the aid of the piezo ceramic into electrical signals.
Piezo-electric effect: If a mechanical force acts on a crystal, electrical voltages are produced.