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.

china wheel cap：http://www.gasgoo.com/hot/p-wheel-cap.html

china instrument panel：http://www.gasgoo.com/hot/p-instrument-panel.html

china seat cover & seat cushion：http://www.gasgoo.com/hot/p-seat-cover.html

china knock sensor：http://www.gasgoo.com/hot/p-knock-sensor.html