For today’s typical high-torque engines, a form of wheelslip regulation or traction control (ASR) can increase both comfort and safety, particularly on surfaces with differing coefficients of friction or on slippery roads. It makes smooth starts and acceleration possible through all speed ranges without wheel-spin or fishtailing.
ASR only operates in conjunction with the Electronic Accelerator (E gas) and uses components of the Anti-lock Brake System (ABS). If one wheel suddenly begins to rotate faster than the others (slip), ASR intervenes in the engine management system and reduces power until the wheel stops spinning.
ASR improves traction and can help the driver maintain control even if the limit of adhesion is inadvertently reached while cornering. In addition, it reduces tire wear. ASR activation, is indicated by a flashing light in the instrument cluster; it works with the electronic differential lock (EDL) and it is also part of the Electronic Stabilization Program (ESP®). ASR can be deactivated with the ESP® switch.