SL 600 (230.476) V12-5.5L Turbo (275.951) (2004)
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Wheel Speed Sensor: Description and Operation
GF42.45-P-4550-02S Wheel speed sensor, function Models 211, 230, 240
Function of the active wheel speed sensor
The strength and direction of an external magnetic field causes a change in the internal resistance inside the sensor. Electronic processing circuitry in
the sensor generates a square-wave signal characterized by a constant amplitude level in which the frequency varies to reflect fluctuations in the
rotation rate. The system recognizes the vehicle's direction of travel based on the signal patterns for left and right side wheel rotation. This signal is
received by the relevant dynamic handling control system and transmitted over the CAN.
The sensor can also detect unsatisfactory installation positions and relay this information to the SBC control unit.
The external magnetic field is generated by a multipole reluctor ring.
This consists of an elastomer plastic containing metallic particles. These are aligned by a special magnetization method so as to produce various
magnets whose polarity at the circumference alternates from north to south.
