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ABS WHEEL-SPEED SENSOR AND ABS SENSOR ROTOR CONSTRUCTION/OPERATION

id041300185100

## Construction

• The front ABS wheel-speed sensor is installed on the steering knuckle and the front ABS sensor rotor is integrated with the drive shaft.
• The rear ABS wheel-speed sensor is installed on the hub spindle and the rear ABS sensor rotor is integrated with the wheel hub.

1 | ABS wheel-speed sensor
2 | Permanent magnet
3 | Coil
4 | ABS sensor rotor
5 | Pole piece

## Operation

• As the ABS sensor rotor rotates, magnetic flux formed from the permanent magnet varies and alternating current is formed with an electromagnetic conductor. Using this alternating current, rotation speed is expressed as a varying proportional cycle and from detection of this cycle the CM part of the ABS (ABS/TCS) HU/CM can then detect the wheel rotation speed. While the structures of the front and rear ABS wheel-speed sensor differ, the operation is the same.

1 | Output voltage waveform
2 | At high speed
3 | At low speed