Wheel Speed Sensor: Description and Operation
WHEEL SPEED SENSORWheel Speed And Modulator Control & Fluid Pressure:
WHEEL SPEED AND MODULATOR CONTROL
When the wheel speed drops sharply below the vehicle speed, the inlet valve closes to retain the caliper fluid pressure. When the wheel speed drops further, the outlet valve opens momentarily to reduce the caliper fluid pressure. The pump motor starts at this time. As the wheel speed is restored, the inlet valve opens momentarily to increase the caliper fluid pressure.
Wheel Sensor/Gear Pulser:
AC Current:
Wheel Sensor
The wheel sensors are the magnetic contactless type. As the gear pulser teeth rotate past the wheel sensor's magnetic coil, AC current is generated. The AC frequency changes in accordance with the wheel speed. The ABS control unit detects the wheel sensor signal frequency and thereby detects the wheel speed. There are four wheel sensors, one for each wheel. The gear pulser has 50 teeth.