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Electronic Stabilisation Program

The electronic stabilisation program detects critical handling situations, such as a risk of skidding, and takes effective action to keep the vehicle on course. To enable the  electronic stabilisation to respond to such critical situations, the system must be fed constantly with data. For instance, which way the driver is steering the vehicle, and where it is actually heading. The answer to the first of these questions is provided by the steering angle sensor and the wheel speed sensors. These two items of information allow the control unit to calculate the target steering direction for the vehicle and its target handling behaviour. Further key data includes the yaw rate and the lateral vehicle acceleration. The control unit uses this information to calculate the vehicle’s actual driving state.
The electronic stabilisation prevents the vehicle from being destabilised when cornering as a result of either excessive speed, an unexpected change in the road surface (water, ice, dirt) or the driver having to perform a sudden evasive manoeuvre. The system takes corrective action regardless of whether the instability manifests itself as understeer – when the vehicle slides towards the outside of the bend despite the wheels being turned into the bend – or oversteer, when the vehicle’s tail swerves out.
The electronic stabilisation program's computer unit uses the data supplied by the network of sensors to determine the nature of the vehicle's instability and governs the corrective response by intervening in the braking and engine management systems. If the vehicle is understeering, the electronic stabilisation system decelerates the rear wheel on the inside of the bend. At the same time, it reduces engine power until stability has been restored. The electronic stabilisation counters oversteer by carefully applying the front brake on the outside of the bend and intervening in the engine and transmission management.
Thanks to increasing experience and much more sensitive sensors, it is possible to keep on improving this complex control system.

The system also includes the following safety and convenience functions:

  • ABS Anti-Lock Braking System
  • EBD Electronic Brake Force Distribution
  • HVV Maximum Rear Axle Deceleration
  • ASR traction control
  • EDL Electronic Differential Lock
  • MSR Engine Drag Torque Control
  • HBA Hydraulic Brake Assist
  • Overboost Hydraulic Booster
  • HBV Hydraulic Brake Servo
  • Trailer stabilisation
  • Brake disc wiper function