Knock sensors
The knock sensor consists of the piezoceramic ring, a seismic mass, and contact
electrodes. The complete unit is attached to the engine block at an appropriate
location. Due to the engine vibrations, the knock sensor is accelerated and
thus the seismic mass generates a force to the piezoceramic ring which is generating an
electrical signal which is proportional to the vibrations in a wide frequency range.
If the engine starts to "knock" because gasoline with a lower octane rating has been
put in or because operating conditions have changes, this knocking signal is detected
by the evaluating electronics and the ignition map is readjusted accordingly.
This intelligent engine management allows combustion to take place very close to the knocking limit. The result: free choice of the fuel (octane ratio) and a reduction in fuel consumption.
Designs: Ring, round disk
Material: SONOX® P 4, SONOX® P 5, SONOX® P 502