The role of magnets in the car gear sensor and the introduction of the material

The magnet plays a key role in the car's gear sensor. It activates the sensor by generating a magnetic field that enables it to sense the vehicle's gear correctly, thus ensuring the smooth operation of the engine and transmission. The material of the magnet has an important influence on its performance, and iron oxide magnets and NdFeB magnets are generally used.

Iron oxide magnets are one of the commonly used materials in sensors because of their better stability and strong magnetic properties in high temperature and humid environments. In addition, NdFeB magnet is a new type of high strength magnet material, its magnetic performance is better than iron oxide magnet, but it is not stable in higher humidity and higher temperature environment, and is suitable for sensors in lower temperature and dry environment.

In the transmission of a vehicle, the direction and speed of rotation of the power output shaft and the internal gears that transmit power in the transmission are constantly changing. Therefore, in order to correctly transmit information about the current state to the vehicle's electronic control system and enable automatic control, an automotive gear sensor is required to detect and identify the current gear information.

The magnet in the automotive gear sensor plays a very important role. In the small hole around the output shaft where the sensor is mounted, there is a set of magnetic sensitive resistors or Hall element (Hall element) installed, which can detect the change of magnetic field generated by the magnet corresponding to it. When the output shaft rotates, the magnet rotates with it, thus constantly changing the magnetic field strength and pole direction around the output shaft, thus generating a change signal that can be detected by the sensor.

By detecting the sensor signals in the engine control unit (ECU), the vehicle's electronic control system is able to accurately determine the current driving state, including start, neutral, drive, reverse, and park, and thus automatically control the vehicle transmission's gear shifts and power output. This design solution has the advantage of being fast, accurate, and can greatly improve driving comfort and safety.

Overall, magnets play an important role in automotive gear sensors, and their selection is based on the needs of the sensor and environmental conditions.