Engine knock detecting apparatus

摘要: An engine knock detecting apparatus for sensing knocking occurring in an internal combustion engine. The has a vibration sensor having component caused by the taking place and outputting electric signal corresponding to vibration. A feed back loop is formed first mean level detection circuit which determines outputs value of derived from sensor, gain controller controls amplifier accordance with produced circuit, such that amplified takes equal or above predetermined level. compared comparator reference delivered through second generator. representing occurrence when exceeded signal.