What is the knock signal for BMW?

[JocelynRose]

BMW knock sensor knock signal is 70-80. Knock Sensor: The knock sensor is installed in the middle of the engine block. Taking a four-cylinder engine as an example, it is installed between cylinders 2 and 3. It is used to measure engine vibration and adjust the ignition timing when engine knocking occurs. Function of Knock Sensor: The function of the knock sensor is to transmit engine knocking to the electronic control module in the form of an electrical signal, serving as an important basis for the control module to adjust ignition timing to prevent further knocking. Knock sensors are generally piezoelectric ceramic types. When the engine vibrates, the ceramic inside is squeezed to generate an electrical signal. When vibration or knocking occurs, it produces a small voltage peak. The greater the knocking or vibration, the larger the peak generated by the knock sensor.