What is the Working Principle of an Automotive Speed Sensor?

1 Answers
LaAva
07/29/25 9:26pm
Automotive speed sensor working principle is to detect the speed of electronically controlled vehicles. The control computer uses this input signal to regulate engine idle speed, torque converter lock-up in automatic transmissions, automatic transmission gear shifting, engine cooling fan operation, cruise control, and other functions. The speed sensor's output signal can be an alternating current (AC) signal of the magnetoelectric type. Speed sensors are typically installed in the drive axle housing or transmission housing, displaying vehicle speed through needle deflection or generating alternating current signals. They usually consist of a magnetic core with two terminals and a coil. These two coil terminals serve as the sensor's output ports, converting signals into current amplitude to represent vehicle speed.
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