Cruise control with brake function: Notes

The functionality of the cruise control system with its braking function is integrated in DSC. The cruise control maintains the speed at the selected level, between 30 km/h and 250 km/h. In comparison with a conventional cruise control, it has the following additional functions:

• If the engine drag torque in coasting (overrun) mode is not sufficient to maintain the selected speed, the DSC additionally decelerates by means of controlled brake intervention.
• Depending on the current lateral acceleration, the speed in longitudinal direction is transverse acceleration during controlled cornering. At the end of the bend, the set speed is readjusted.
• The so-called "handgas mode" enables the driver to use the steering-column lever to continuously accelerate or decelerate in 2 stages. This means that the desired speed is reached more quickly.
• During controlled downhill driving, the overrun fuel cutoff as well as shift down of the automatic transmission are adapted. The DSC uses a substitute temperature model to regulate the distribution of torque between the front and rear axle. The overrun fuel cutoff has a favorable effect on fuel consumption. Automatic shiftdown and distribution of torque relieve the load on the wheel brake during hill descents.