Automatic stability control
Automatic Stability Control (abbreviated ASC for English Automatic Stability Control ) is the brand name electronic traction control systems of the manufacturer BMW . The system is used in both cars and various motorcycles.
functionality
The automatic stability control was offered in two generations.
ASC, as a classic traction control system, prevents the driven wheels from slipping (spinning) by electronically throttling the engine output by intervening in the injection signal for individual cylinders or electronically controlled closing of the throttle valve . The further development ASC + T (Automatic Stability Control + Traction) also brakes the driven wheels individually or together with the help of the technology already available for the ABS up to 40 km / h , if the reduction in power alone is not sufficient. In addition, it electronically takes on the function of a differential lock by braking only one wheel when it spins. ASC + T is a transition to the DSC used today , which can brake any wheel at any speed and which contains the ASC + T functions.
The BMW-Motorrad-ASC compares the wheel speeds of the front and rear wheels. The slip and thus the stability reserves on the rear wheel are determined from the speed difference. If a slip limit is exceeded, the engine torque is adjusted by the engine control.
Use
The system guarantees driving stability within the physical limits. It is particularly useful in curves with a changing surface (e.g. asphalt - leaves, snow - ice). If a wheel slips in a curve, it usually leads to the vehicle swerving and an accident.
literature
- Robert Bosch (Ed.): Autoelectronics Autoelectronics. 5th completely revised and expanded edition. Vieweg & Sohn Verlag, Wiesbaden 2007, ISBN 978-3-528-23872-8