Hill descent aid

The Hill Descent Control (also Hill Descent Control (HDC) and Downhill Speed Regulation (DSR)) is primarily for sport utility vehicles used (SUVs) and off-road driving stability aid when traveling downhill on loose ground or on a low coefficient as snow lying on the ESP builds up. HDC controls the speed of a vehicle with the help of brake intervention and engine drag torque and thus keeps it constant, depending on the surface, at an intended 10-20 km / h.

When driving downhill, a relatively slow and safe downhill speed is automatically regulated electronically by the system , similar to a reduction gear , at which the vehicle masters a downhill trip without overbraking, especially the rear axle and the associated loss of cornering. The driver only has to steer, not brake or accelerate in order to drive the vehicle down the slope or mountain in a stable and safe manner. Additional acceleration is still possible. The physical relationship is analogous to the function of ABS: only a rolling wheel can build up enough forces for lateral guidance on any surface and thus leads to controlled downhill travel.

This electronic aid can partially, but not always, replace a reduction gear and thus save costs. HDC can usually only be switched on at speeds below 40 km / h.

Hill descent aid

See also