Abs Wheel Speed Sensor

Each of the ABS wheel speed sensors detects the speed of the corresponding wheel. The sensor consists of a sensor body and a magnetic encoder. The magnetic encoder is a permanent magnet with N poles and S poles arranged alternately, and when this turns together with the wheel the magnetic field at the sensing area of the sensor body changes. The sensor body has a hall element and outputs signals at a frequency proportional to the wheel speed.

Fig 1: Identifying Sensor Body, Hub Unit Bearing, Magnetic Encoder And Housing

Courtesy of SUBARU OF AMERICA, INC.