Circuit Description
A flat type knock sensor (non-resonant type) has the structure that can detect vibration in a wider band of frequency from approximately 6 kHz to 15 kHz and has the following features.
Knock sensor is fitted on the left side of the cylinder block to detect engine knocking.
Each sensor contains a piezoelectric element which generates a voltage when it becomes deformed. This occurs when the cylinder block vibrates due to knocking. If engine knocking occurs, the ignition timing is retarded to suppress it.