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A control loop is permanently monitoring the signal of one or more knock sensors (commonly piezoelectric sensor which are able to translate vibrations into an electric signal). If the characteristic pressure peak of a knocking combustion is detected the ignition timing is retarded by steps of a few degrees.
To detect knock, a piezoelectric knock sensor (basically a microphone) bolted to the engine block responds to unique frequencies caused by engine knock. The sensor generates a small voltage that is sent to the electronic control unit , which processes the signal to determine if, in fact, knock is occurring.
[citation needed] The five-pin module was introduced in 1978 and was an early attempt at electronic timing control; it contains a provision for connecting a knock sensor. [ citation needed ] The seven- and eight-pin modules are used on early computer -controlled engines in conjunction with fixed-timing distributors, as the computer controls the ...
It's commonly known as "Detonation or Knock". Engine management systems can overcome pre ignition by the means of a knock or detonation sensor. The sensor will detect pre ignition and retard the engines timing to protect the engine from damage. Undesired engine behavior will occur such as loss of performance or power.
knock sensors; inlet manifold pressure sensor ; intake air temperature; intake air mass flow rate sensor ; oxygen (lambda) sensor; throttle position sensor; wheel ...
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Knock sensor; Light sensor; MAP sensor; Mass airflow sensor; ... Speed sensors are machines used to detect the speed of an object, usually a transport vehicle. They ...
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