The main types of ABS sensors

1, linear wheel speed sensor

Linear wheel speed sensor is mainly composed of permanent magnet, pole axis, induction coil and tooth ring. When the gear ring rotates, the tip of the gear and the backlash alternate opposite polar axis. During the rotation of the gear ring, the magnetic flux inside the induction coil changes alternately to generate the induction electromotive force, and this signal is input to the electronic control unit of ABS through the cable at the end of the induction coil. When the speed of the gear ring changes, the frequency of the induced electromotive force also changes.

2, ring wheel speed sensor

Annular wheel speed sensor is mainly composed of permanent magnet, induction coil and tooth ring. The permanent magnet is composed of several pairs of magnetic poles. During the rotation of the gear ring, the magnetic flux inside the induction coil changes alternately to generate the induction electromotive force. This signal is input to the electronic control unit of ABS through the cable at the end of the induction coil. When the speed of the gear ring changes, the frequency of the induced electromotive force also changes.

3, Hall type wheel speed sensor

When the gear is located in the position shown in (a), the magnetic field lines passing through the Hall element are dispersed and the magnetic field is relatively weak; When the gear is located in the position shown in (b), the magnetic field lines passing through the Hall element are concentrated and the magnetic field is relatively strong. When the gear rotates, the density of the magnetic line of force passing through the Hall element changes, which causes the Hall voltage to change, and the Hall element will output a millivolt (mV) level of quasi-sine wave voltage. This signal also needs to be converted by the electronic circuit into a standard pulse voltage.