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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.
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.
Pressure in cylinder pattern in dependence on ignition timing: (a) - misfire, (b) too soon, (c) optimal, (d) too late. In a spark ignition internal combustion engine, ignition timing is the timing, relative to the current piston position and crankshaft angle, of the release of a spark in the combustion chamber near the end of the compression stroke.
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[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 ...
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related to: symptom of bad knock sensor symptoms chevyebay.com has been visited by 1M+ users in the past month
yourmechanic.com has been visited by 10K+ users in the past month
138 S Wheatland Ave, Columbus, OH · Directions · (614) 963-9299
walmart.com has been visited by 1M+ users in the past month