[Auto Repair Knowledge]Analysis of knock sensor (picture)

Knock will cause the gas to vibrate strongly and produce noise; it will also causeSpark plug, Combustion chamber,pistonIf the parts are overheated, serious conditions will damage the engine.

When the engine structural parameters have been determined, delaying the ignition advance angle is one of the effective and simple measures to eliminate knock.
Equipped with knocksensorThe engine can detect the knock limit, and adjust the ignition timing to a position close to the knock limit through the electronic control unit, thereby improving the performance of the engine.

When the engine knocks, the ECU delays the ignition timing according to the degree of knock. If the degree of knock is large, not only the angle of delay is large, but also fast and then slow until the knock disappears. In order to ensure good engine performance, after the knocking disappears, the ignition advance angle is gradually increased, and the increase rate is also divided into two types: fast and slow. When the engine knocks again, the ignition advance angle is delayed again. Generally, the rate of retardation of the ignition advance angle is greater than the rate of increase of the ignition advance angle.

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