What does Hill Descent Control (HDC) mean in cars?

1 Answers
AlanLee
07/30/25 6:20am
Hill Descent Control (HDC), also known as the slope control system, enables drivers to smoothly navigate steep downhill slopes without the need to press the brake pedal, maintaining full control. The system automatically controls the braking of each wheel as needed, allowing the vehicle to move forward slightly faster than walking speed, while the driver can focus entirely on steering. The principle of HDC is to combine engine braking with the ABS anti-lock braking system to maintain a "low speed without losing tire traction" when descending steep slopes. HDC must be engaged when the transmission is in 1st gear or reverse gear (as there are two types of steep descents: forward and reverse), and the system typically sets a speed limit to allow the driver to control the vehicle with ease.
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