how do speedometers work?
In: Technology
Most of these comments are about old school speedometers, built before about 2000 for the most part. Any modern car, specifically any car with ABS braking, measures the speed with what is called the ABS ring. A toothed ring mounted just behind the brake assembly on each wheel. The car computer constantly monitors the speed that the ring turns, by counting the teeth as they pass a special sensor. This both provides the speed for the speedometer, and also let’s the computer know if one wheel is either skidding, to active the ABS system, or spinning, to activate traction control.
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