MAN Truck & Bus
As with braking, the slip between tyres and road also increases with extra driving force when starting off or rapidly accelerating. The speed of one or both drive wheels increases due to excessive torque when the slip reaches a critical value. Traction decreases and the wheels spin uncontrollably. A TCS traction control system regulates the torque initiated at excessive wheel speed on the drive axle(s) by braking with the service brake (brake control circuit) and by withdrawing the engine's effective drive torque (engine control circuit). Drive slip is reduced to permissible values. The main task of a TCS is thus to ensure stability when a commercial vehicle starts off and accelerates. Tyre wear is also minimised. A TCS traction control system is frequently combined with an ABS Anti-lock Braking System. ABS components, such as speed sensors and pressure control valves, are also used by the TCS. MAN offers TCS in combination with ABS as part of its EBS Electronic Braking System.