The burning of the engine is very
complicated, so the need for a very accurate design and control, a little
control errors or disorders, it will cause abnormal combustion, and
"knock" is an abnormal combustion. Simply put, the knock is not
normal combustion caused by the pressure inside the combustion chamber.
When the engine is working due to excessive
ignition time (ignition advance angle), the engine load, temperature and fuel
quality and other effects, will cause the engine knock. In the event of
knocking, due to gas combustion before the piston moves to the top dead center,
the light produces noise and reduces the power of the engine, which can damage
the mechanical parts of the engine. In order to prevent the occurrence of
knock, china knock
sensor is an indispensable important parts, in order to adjust the ignition
through the electronic control system ahead of time.
Because the engine there is knocking
phenomenon, so there will be a knock sensor, china knock sensor
installed in the middle of the engine cylinder to four-cylinder machine as an
example installed in the 2 and 3 cylinder, or 1, 2 cylinder in the middle of a
, 4
in the middle of a cylinder. Its role is
used to determine the engine jitter, when the engine knock, the china knock sensor to
the engine's mechanical vibration into a signal voltage sent to the ECU. ECU in
accordance with its internal storage in advance of the ignition and other data,
timely calculation of modified ignition advance angle, to adjust the ignition
time to prevent the occurrence of knock.
Low-grade fuel, ignition too early and
other causes of engine knock can cause engine damage. The effect of the knock
sensor is to transmit the engine knock in the form of an electrical signal to
the electronic control module as an important basis for the control module to
adjust the ignition timing to prevent further knocking. The knock sensors are
generally of the piezoelectric ceramic type, and when the engine has jitter,
the ceramic inside is squeezed to produce an electrical signal.
There are many kinds of knock sensors, such
as magnetostrictive detonation sensors, piezoelectric ceramic knock sensors,
piezoelectric resonant sensors.
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