A toothed rotor is fixed
to the rotating member of the wheel, and the sensor is fixed to the static
member of the suspension. As the wheel rotates the toothed rotor causes
magnetic flux changes in the magnetic field of the permanent magnet. The
sensor element senses these changes. Depending on the flux changes the
sensor sends a signal out to the ECU. The change in magnet flux thus the
sensor signal is directly related to the wheel speed.
The controller monitors
the sensor signal, compares the four wheel-speed signals and initiates
action as required.

SPECIFICATIONS
Item
|
Standard Value
|
Remark
|
Supply voltage
|
DC
12V
|
|
Operating temperature
|
-40~120°C
|
R=100Ω
|
Output current range
|
Low
|
7mA(5.9~8.4mA)
|
|
High
|
14mA(11.8~16.8mA)
|
|
Frequency range
|
1~2000 Hz
|
|
Airgap
|
0.2~1.5mm(0.008~0.0591 in.)
|
|
Tone
wheel
|
Number
|
44
|
|