Dynamic Driving Safety Systems
ABS
Wheel Speed Sensor
•
Depending on the vehicle, the ABS uses passive or active wheel speed sensors. Each
wheel sensor sends a pulsed speed signal to the ABS control module. Based on those
signals, the control module calculates the speed of each wheel and the vehicle speed.
When a wheel speed difference occurs, while comparing the vehicle speed with each
individual wheel speed, this is used as an indication of changing grip on an individual
wheel.
•
Based on this information, the ABS control module calculates the slip of each wheel
during braking. With the aid of the ABS operation the ABS control module keeps the slip
of the wheels in the range of 15…30 % to ensure good steerability and high brake
forces.
L2003_02009
Mazda3
1
Wheel speed sensor
3
Wheel bearing
2 Steering
knuckle
4 Pulse
rotor
Curriculum Training
02-15