ECM (the engine control unit) Provides active knock suppression to prevent engine damage due to pre-ignition or knocking in all operating modes and makes it possible to control the engine without setting safety margins. To ECM (the engine control unit) was able to determine the pre-detonation point of the cylinder, 2 piezoceramic sensors were mounted in the cylinder block. Each sensor controls engine knock by converting the noise in the cylinder block into a corresponding electrical signal, which is then transmitted via a cable such as "twisted pair" sent to ECM (the engine control unit) . This signal is processed by the ECM (the engine control unit) to identify characteristics indicative of detonation.
The received information is compared with the given signal curves, as a result of which it is determined whether there is a detonation in the engine. If detonation occurs, the closed-loop control system shifts the ignition timing in the cylinder to the side of delay by several cycles, after which it gradually returns to its original state.
Symptoms
The following are symptoms of malfunctioning knock sensors:
- Knock suppression is disabled and the default "safe ignition map" is used.
- Hard work and reduced engine performance.
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