Hill Descent Control system

Hill Descent Control (HDC ) and Hill Descent Control is mainly for sport utility vehicles (SUV ) and off roaders used vehicle stability assistance when traveling downhill on loose ground or on a low coefficient as snow, which is based on the ESP. HDC controls the speed of a vehicle by means of brake intervention and engine drag torque and keep it as constant, depending on the surface on proposed 10 - 20 km / h

When driving downhill a relatively slow and safe downhill speed is similar to a gear reducer electronically automatically adjusted by the system in which the vehicle without brakes, particularly the rear axle and the concomitant cornering loss, tracks properly mastered a downhill. The driver only needs to steer, no brakes or accelerating around the vehicle stable and safe ride down the hill or mountain. Additional acceleration is still possible. The physical relationship is analogous to the function of the ABS: Just a rolling wheel can on any type of ground build up enough forces for lateral support and thus leads to a controlled downhill driving.

These electronic means can be partially, but not always, replacing a reduction gear and thus saves costs. Switchable HDC is usually only at speeds below 40 km / h