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Types of Vehicle Speed Sensors?

2 Answers

StBrielle

07/30/25 2:29am

Vehicle speed sensors are divided into three types: magnetic speed sensors, Hall-type speed sensors, and photoelectric speed sensors. The main functions of the vehicle speed sensor are as follows: 1. The vehicle speedometer displays the driving speed of the car through the swing of a pointer. 2. Simply put, the speedometer contains a system (including a rotating disk with a pointer shaft, a rotating shaft with permanent magnets, bearings, hairsprings, and other components) that controls the swing of the pointer. The swing amplitude of the pointer is ultimately determined by the rotational speed output from the transmission (i.e., the rotating shaft of the speedometer is driven by a flexible shaft, which is connected to the worm gear in the worm-gear transmission pair on the output shaft of the car's transmission or transfer case). 3. Due to the manufacturing process of the components themselves, assembly errors, natural wear during use, and changes in the magnetism of magnetic components, all can cause indication errors in the speedometer.

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DeAxel

08/15/25 8:39am

Vehicle speed sensors are mainly divided into three types: magnetic induction, Hall effect, and optical. Magnetic induction sensors are commonly found in older vehicle models, generating electrical pulses by gear rotation cutting magnetic field lines, featuring simple structure and low maintenance cost. Hall effect sensors are currently the most popular, using magnetic targets to trigger Hall elements for digital signal output, often installed at wheel hubs or transmission output shafts. They offer high measurement accuracy and strong anti-interference capability but require additional power supply. Optical sensors are more common in motorcycles, determining rotation speed via LEDs and photosensitive components. When these sensors malfunction, the dashboard speed display may fail, and automatic transmission shifting may become jerky. Ensure compatibility with your vehicle model during selection, as mismatched installation can easily damage circuit modules.

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