Principle Analysis | The function and working principle of the camshaft position sensor

Some small parts on large auto parts play the role of information transmission and have a key control role. For example, the camshaft position sensor, today's editor will make everyone understand the meaning of his existence through a detailed introduction.

Camshaft Position Sensor Concept

It is actually a positioning device, that is, to determine the cylinder. It is positioned through the input of the ECU, and the signal transmission of ignition control is also carried out. At present, there are two types of crankshaft position sensors and camshaft position sensors in the market.

Introduction of ordinary sensors

1. Type: It belongs to a type of engine speed and crankshaft angle sensor, and is widely called a cylinder identification sensor.

2. Principle: Work by collecting crankshaft rotation angle and engine speed signal, mainly to determine the punctuality of engine ignition and fuel injection. In order to distinguish its working performance, we generally use the CIS logo for identification. Carry out fuel injection control, ignition time control, and deflagration control according to the corresponding working sequence.

Introduction of photoelectric sensors

1. Structure: It is mainly composed of signal disc (that is, signal rotor), signal generator, distributor, sensor shell and wire harness plug and other devices. Receive, communicate and perform the tasks given through signal rotor and signal sensor.

2. Principle: First, the signal of the model plate is turned to the transistor of the LED, and then the corresponding electrode output voltage is concentrated. The voltage is generally 0.1V-0.3V, and the LED transistor will emit a voltage of 4.8V-5.2V. Finally, the corresponding signal is transmitted through the rotation of the signal plate, which will form a G signal sensor to generate one signal, and a Ne signal sensor to generate 60 signals.

Introduction of Magnetic Induction Sensor

1. Principle: When the given magnetic force passes through the permanent magnet, and then corresponds to the S-level of its magnet, the alternating electromotive force will be generated through the periodic change of the cycle. When the signal rotates clockwise, the air gap is reduced, the magnetic circuit reluctance is reduced, the magnetic flux φ is increased, the magnetic flux change rate is increased, and the induced electromotive force E is positive.

When the magnetic flux is rotated to the center-aligned position, the magnetic flux change rate is zero, and the induced electromotive force E is zero; when the clockwise rotation is continued, the air gap increases, the magnetic circuit reluctance increases, and the magnetic flux is increased. φ is reduced, and the electromotive force E is negative.

2. Note: What needs to be paid attention to during operation are the structural characteristics of the Ne signal generator, the generation principle and control process of the rotational speed and angle signal, the structural characteristics of the G signal generator, the generation principle and control of the cylinder identification and top dead center signal. Process.