GF07.04-P-6030V Knock Sensor Component Description

GF07.04-P-6030V Knock Sensor Component Description







Location
The knock sensors are located at the top of the crankcase under the intake manifold.

Task
The knock sensors detect combustion knocks at excessively high vibrations at the crankcase. Anti-knock control thereby corrects the ignition timing for each individual cylinder when the engine is warm.

Body
The knock sensors function according to the piezoceramic principle. The screened cables are connected directly to the knock sensors.







Function
Any vibrations which occur are converted with the aid of the piezoceramic into electrical signals.

Piezo-electric effect: If a mechanical force acts on a crystal, electrical voltages are produced.

The noise signal is modulated to a DC voltage from 0.13 to 4.7 V for transmission to the ME control unit.

Knock sensor signals may also indicate engine damage, e.g. increased engine noise resulting from a widened piston groove.