What is the working principle of a car speed sensor?

[MacNaomi]

The working principle of a car speed sensor is: The output signal of the speed sensor can be a magnetoelectric AC signal. The speed sensor is usually installed in the drive axle housing or transmission housing, displaying the vehicle's speed through pointer swings or generating alternating current signals. It typically consists of a magnetic core and coil with two terminal posts. These two coil terminal posts are the output terminals of the sensor, converting into current amplitude to represent the vehicle speed. More information about the speed sensor is as follows: 1. The speed sensor is a device used to detect the speed of electronically controlled vehicles. The control computer uses this input signal to control engine idle speed, torque converter lock-up in automatic transmissions, automatic transmission shifting, and other functions such as the opening and closing of the engine cooling fan and cruise control. 2. The magnetoelectric speed sensor is an analog AC signal generator, usually composed of a magnetic core and coil with two terminal posts.