Cruise control with brake function

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.