WHEEL SPEED SENSORS OPERATING IN HARSH ENVIRONMENTS
Wheel speed sensors (WSS) operate in harsh environments with limited shielding and temperature control. WSS are required to provide correct speed and direction information for wheel speed, anti-lock braking, and traction control systems. Allegro Microsystems has developed innovative algorithms and high-performance sensors to operate in these environments. Modern Allegro Microsystems wheel speed parts have introduced SolidSpeed Technology which has moved much of the signal processing and detection to the digital domain. This allows the magnetic signal to be tracked in a way that previously was not possible. These sensor solutions are typically in a 2-wire package can utilize a pulse width protocol or AK protocol to provide speed, direction, relative air gap, and additional information. Modern Allegro WSS are designed with optional fault reporting for ASIL compliance.
●Key Parameters
Throughout this document the air gap of the sensor in relation to the target is continuously referenced. This section is to discuss proper WSS alignment with the associated target. Determining this air gap requires two known mechanical features.
■The branded face of the sensor is to point towards the target and be parallel with the face of the target.
■The distance from the branded package face to target is considered the operating air gap of the sensor.
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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August 24, 2021 |
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MCO-0001137 |
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1.9 MB |
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