The function of automobile sensor is to detect the engine working condition information related to the ignition advance angle, and input the information to the electronic control unit as the basis of calculation and time.

1. According to the physical quantity of the sensor, it can be divided into displacement, force, speed, temperature, flow, gas composition and other sensors.

2. According to the working principle of the sensor, it can be divided into resistance, capacitance, inductance, hall, photoelectric, grid, thermocouple and other sensors.

3. According to the nature of the output signal of the sensor, it can be divided into: switching sensors with input unswitched values ("1" and "0" or "on" and "off"); The output is not analog sensor; Digital sensors that do not output pulses or codes.

4. According to the function classification of sensors in the automobile, they can be classified into measurement temperature sensor, dry humidity sensor, distance sensor, etc. they perform their respective duties. If a single sensor fails, the corresponding device will not work normally or even not work. Therefore, the role of automotive sensors is very important.