ECM (engine control unit) provides active knock suppression to prevent engine damage due to pre-ignition or detonation in all operating modes and enables engine control without setting safety limits. In order for the ECM (engine control unit) was able to determine the pre-detonation point of the cylinder, 2 piezoceramic sensors are mounted in the cylinder block. Each sensor monitors engine detonation, converting noise in the cylinder block into a corresponding electrical signal, which is then transmitted to the ECM via a twisted pair cable (engine control unit). This signal is processed by the ECM. (engine control unit) to detect characteristics indicating detonation.
The information received is compared with the specified signal curves, as a result of which it is determined whether there is detonation in the engine. If detonation occurs, the closed control system shifts the ignition timing in the cylinder towards a delay of several cycles, after which it gradually returns to the original state.
Signs of malfunction
Below are some signs of faulty knock sensors:
- Knock suppression is disabled and the default "safe ignition map" is used.
- Harsh operation and reduced engine performance.
(The publication was copied from a web resource: www.LRman.ru)
One of the sensors is located in the center of the engine recess, and the other is on the right front side of the cylinder block.
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