The knock sensor is mounted on the engine block in the middle of the four cylinder machine were installed in the 2 cylinder and 3 cylinder, 2 cylinder or 1, a 3,4, a middle cylinder. Its function is to use the piezoelectric effect to the mechanical vibration generated when the knock into the signal voltage. When the natural frequency of favorable knock when the vibration frequency and the piezoelectric effect of the sensor itself, namely resonance phenomenon. Then the sensor will output a high voltage knock signal sent to ECU ECU, modify ignition time, avoid detonation.
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