ASR (Antriebsschlupfregelung)

ASR traction control ensures the transmission of power from the engine to the road surface.

ASR Traction control system (from the German Antriebsschlupfregelung) prevents rotation of the drive wheels by reducing engine power. In the event that the drive wheels begin to spin, the ASR system reduces engine torque to which the wheels are under the adhesion conditions be able to pass on the road without spinning.

Principle:

TCS works in conjunction with the system EDS and the engine control unit . Unlike EDS (electronic differential lock), ASR can operate at any speed vehicle. ASR system to improve safety and driving stability on slippery surfaces, while ensuring smooth acceleration without slipping wheels. When driving in turn traction control system works against the vehicle understeer and increased driving stability.

Wheel speed sensors, which are common with ABS , constantly monitor wheel speed of the driven axle. The control unit, which is also shared with ABS , compares these data with non-driven wheel speed axle. If, on the basis of signals from the speed sensor control unit evaluates that there is a slip of drive wheels (wheels), the controller issued an instruction that the wheel was braked. For higher speeds the engine control unit is issued a command to reduce engine torque defend ourselves forced gas. As a result of this intervention, the wheels stop turning.

If the ASR system while driving an active flashing light on the dashboard. The driver can then adjust your driving style, it is also warned that it is located on a road with poor adhesion. ASR can be turned off as when driving with snow chains, it is inevitable slippage. Vehicle equipped with ASR also includes EDL electronic differential lock , which operates up to 40 km / h.

When ASR is working?

Driven front axle, speed difference between front wheels:
- Up to approx. 40 km / h EDS performs control system through targeted interventions in the braking at higher speeds, the ASR system reduces engine torque.

Driven front axle, speed difference between wheels front and rear axle:
- In its entirety exclusively at speed compensates for the ASR system.

Driven front axle, speed difference between the front wheels and between wheels front and rear axle:
- The speed of approx. 40 km / h are active both EDS and ASR systems, at higher speeds has been working only ASR.

History:

ASR system in the car first appeared in 1986. There are a number of related systems on similar principles. Different car but use different designations: ASR , ASC , DTC , etc, ETS, TCS and TC .