#
ABS WHEEL-SPEED SENSOR CONSTRUCTION/OPERATION

BHE041543720T02

## Structure

• The front ABS wheel-speed sensor and the front ABS sensor rotor are integrated with the front wheel hub and installed on the steering knuckle. Therefore, if there is any malfunction of the front ABS wheel-speed sensor, replace the front wheel hub component.

1 | Coil
2 | Magnet
3 | Front ABS sensor rotor

• The rear ABS wheel-speed sensor is installed on the rear knuckle and the rear ABS sensor rotor is integrated with the drive shaft. Therefore, if there is any malfunction of the rear ABS sensor rotor, replace the drive shaft.

1 | Rear ABS sensor rotor
2 | Coil
3 | Magnet

## 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 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