The car sensor is mainly used to monitor the speed of the car, and then input the monitoring results to the car instrument system to display the speed of the car. The vehicle speed reduction signal is also input to the ECU of the vehicle control system, which is generally used for automatic transmission systems and cruise control systems.
The output signal of the vehicle speed sensor has three methods, one is a magnetoelectric AC signal, the other is a Hall-type digital signal, and the other is a photoelectric digital signal. The vehicle speed sensor is generally installed in the drive axle housing or in the transmission. The outside of the vehicle speed sensor signal line is shielded, which can eliminate the electromagnetic signal interference generated by other electronic equipment such as high-voltage electric wires, and also enable electronic communication. Without interruption, it will not affect drivability. The most commonly used vehicle speed sensors in automobiles are magnetoelectric and photoelectric. In simple terms, the magnetoelectric vehicle speed sensor is equivalent to an analog AC signal generator. core and coil.