Wheel speed sensor
An automotive electronic control system receives information from a variety of sensors, processes the received information, and drives a corresponding circuit and an actuator in such a way that appropriate control operations can be performed. There are a variety of electronic control systems, for example, an electronically-controlled suspension system, a power steering system, an ABS (anti-lock brake system), a TCS (traction control system), an ESP (electronic stability program), etc. Speed sensing assemblies, which measure the rate of rotation of a vehicle wheel, are critical components of vehicle anti-lock braking systems, traction control systems, and the like. An anti-lock brake system (ABS) for an automotive vehicle includes a wheel speed detecting device for detecting rotational speeds of a road wheel. Wheel speed sensors attached to wheels of a vehicle, respectively, to detect wheel speeds of a running vehicle are designed to detect the rotation of rotors which rotate together with axles coupled to the respective wheels. A rotational speed sensor, as used in an antilock brake system (ABS) and a traction control system (TCS) that controls brake pressure by utilizing information about the rotational speed of the wheels, comprises a pickup component that is affixed to a stationary member such as the vehicle body and a rotor that rotates synchronus to a wheel. The rotor contains a magnetic material and magnetic sensors such as hall effect ICs and MR elements are used to detect the rotation of the rotors. The speed sensor reacts to a stimulus or a signal with a corresponding electrical signal. Wheel speed sensors for automobiles typically utilize an indexing disc mounted on a wheel and a pickup that detects the passage of marker elements carried by the disc as the wheel turns. This pickup can be mechanical, optical or magnetic.
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