Knock Sensor; Ignition Coil - Kubota WG1605-G-E3 Workshop Manual

WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, WSM

[8] KNOCK SENSOR

[9] IGNITION COIL

The knock sensor is used to detect detonation
through mechanical vibration in the engine block and / or
cylinder heads and provide feedback for the ignition
system to retard spark to reduce knock intensity. In most
applications the knock sensor is used to protect the
engine from damage that can be caused from detonation
or knock based on fixed spark advance.
The Knock Sensor is a 5 volt reference signal
sensor, which operates by the resistance change in the
sensor, to output a reference voltage for the Engine
Control Unit (ECU) to use. The knock sensor sends a
base or "no knock" signal to the ECU, when knocking
does occur the sensor detects the increased vibration,
and increases the voltage output to the ECU. When the
ECU receives the voltage change, the ECU will slightly
retard the timing, until such time, the knocking no longer
exists.
Ignition coil is a transformer to generate high electric
voltage necessary for the ignition. Around the iron core
of multi-layer thin crude steel plates, secondary coil is
wound, on whose outside, in the same direction, primary
coil is wound. The empty space in the case is filled with
resin for electric insulation and good heat radiation.
The ignition timing is controlled by ECU and the high
voltage is applied to the spark plugs by the ECU signals.
1-M28
ENGINE
9Y1210661ENM0026US0
9Y1210661ENM0062US0
KiSC issued 05, 2014 A