What does Hill-start Assist Control mean?

[DanteRose]

Hill-start Assist Control (HAC) is a function derived from the ESP system. It allows the vehicle to maintain braking for a few seconds when starting on a slope without using the handbrake, even after the driver's right foot leaves the brake pedal. This enables the driver to easily move their foot from the brake pedal to the accelerator pedal, preventing rollback accidents without causing panic. Below is how the HAC system works: 1. When the vehicle is on an uphill slope, the HAC system automatically maintains brake fluid pressure for 2-3 seconds the moment the driver's foot leaves the brake pedal to press the accelerator, preventing the vehicle from rolling back due to gravity and inertia. 2. When the accelerator is pressed, the system gradually reduces braking force. Once HAC's brake control ends, the vehicle moves forward steadily as you press the accelerator. 3. If the accelerator is not pressed, HAC's automatic brake control will also end after 2-3 seconds.