Posts Tagged: active wheel speed sensor
How Active Wheel Speed Sensors Work
Active wheel speed sensors; how they work and how they differ from passive wheel speed sensors An active wheel speed sensor detects the presence of a magnetic field and reports that presence as a square wave DC digital on/off signal, as opposed to a passive wheel speed sensor which produces an analog AC signal. When used in an anti-lock brake system, an active sensor detects the alternating the north/south poles of a rotating multipole magnetic ring, usually inserted into the wheel bearing. As the wheel rotates, the active wheel speed … Read More
Understanding wheel speed sensors: How they work
Wheel speed sensors — Two types and how each type works A wheel speed sensor tracks the rotation speed of each wheel (in most vehicles *) and reports the speed in either analog or digital form to the Anti-lock Brake Module (ABS Module). The ABS module compares the speed reading from each wheel. If the ABS module senses that one wheel is slowing down faster than the other wheels, it concludes that the slowing wheel is losing traction with the road (due to water, ice or snow). In other words, … Read More