AWD traction control
In an all-wheel-drive vehicle, active traction control monitors wheel-speed signals from all four wheels for signs of wheelspin.
How it works
Wheel-speed sensors tell the controller how quickly each wheel is rotating. Comparing these signals helps the system identify possible wheel slip or differences in traction.
When a wheel begins to spin, a traction-control system can apply braking to that wheel or reduce engine torque. An active AWD system may also adjust how torque is distributed between the axles.
The exact response depends on the vehicle. For example, Toyota’s active torque-control AWD uses signals from ABS sensors at each wheel and an electromagnetic coupler to distribute torque to the rear wheels.
Monitor all four wheels, detect wheelspin, and respond to changing traction.