The knock sensor detects abnormal vibration (spark knock or pinging) in the engine. The knock control system is designed to reduce spark knock during periods of heavy detonation. This allows the engine to use maximum spark advance to improve driveability. The knock sensor produces an AC output votage which increases with the severity of the knock. The signal is fed into the PCM and the timing is retarded to compensate for the severe detonation.
所以knock sensor還是很重要地, 太強的爆振(detonation)會損壞曲軸,聯杆, 和氣門挺杆.那問題就大了.
