Function and type of camshaft position sensor

The function of the camshaft position sensor is to collect the camshaft dynamic angle signal and input it into the electronic control unit (ECU) to determine the ignition timing and fuel injection timing. The camshaft position sensor is also called the cylinder identification sensor (Cylinder Identification Sensor, CIS). In order to distinguish it from the crankshaft position sensor (CPS), the camshaft position sensor is generally represented by CIS. The function of the camshaft position sensor is to collect the position signal of the valve camshaft and input it into the ECU so that the ECU can identify the top dead center of cylinder 1 to perform sequential fuel injection control, ignition timing control and knock control. In addition, the camshaft position signal is also used to identify the moment of the first ignition when the engine is started. Because the camshaft position sensor can identify which cylinder piston is about to reach the top dead center, it is called a cylinder identification sensor.