Excessive ignition timing (ignition advance angle), engine load, temperature, and fuel quality can cause engine knock during engine operation. In the event of knocking, the gas burns before the piston moves to the top dead center, causing noise and reducing the power of the engine, which can damage the mechanical parts of the engine. In order to prevent the occurrence of knocking, the knock sensor is an indispensable important component to adjust the ignition advance time through the electronic control system.
When the engine is knocking, the knock sensor converts the mechanical vibration of the engine into a signal voltage and sends it to the ECU. Based on the internal ignition and other data stored in the ECU, the ECU calculates the corrected ignition advance angle in time to adjust the ignition timing to prevent knocking.