NTK knock sensors

The task of the knock sensor is the recognition of knocking combustion.
The task of the knock sensor is the recognition of knocking combustion.

Knock sensors are used for the detection of knocking combustion. Using the knock sensors, an especially effective combustion of the fuel-air mixture can be achieved through the retraction of the angular ignition spacing and a renewed approach of the knocking limit.

In doing so, the engine output is optimised while fuel consumption and exhaust emissions are reduced. In addition, the knock sensors provide protection of the engine components involved in the combustion process.


The knock sensor is based on a Piezo element which is compressed by an installed weight depending on the structure-borne sound of the fastening point on the engine. In the process, the Piezo element generates a charge depending on this compression and/or acceleration, which is converted to an output voltage. The more level the output characteristics are over the frequency response, the better the recognition of amplitudes caused by knocking combustion.

Application of knock sensors for vehicles with petrol engines.
Application for vehicles with petrol engines

Characteristics of NTK knock sensors:

  • Flat frequency response
  • Plug type and cable type available
  • Compact sensor available for motorcycles
  • High level of reliability

Related topics

Homepage NGK Spark Plug Co., Ltd.: More information about knock sensors can be found on the homepage of the corporate group.

Original equipment: All European automobile manufacturers already use NGK and NTK products in the scope of their vehicle production.