How do anti-lock braking systems (ABS) know when the car’s wheels are about to lock up? Is it the same for traction control (anti-skidding) systems?

Question

Super confused about this! Any explanation would be greatly appreciated.

In: Engineering

Answer 1

ABS has sensors in the wheels that detect if the tires are rotating.

If the sensor notices the wheel has stopped/locked but the car is still moving it will engage the ABS system.

These sensors can also be used to detect a flat tire. If you are moving at speed and one wheel is spinning faster than the one on the other side for a set period then it’s likely a flat.

These days though most cars have TPMS sensors instead for that.