| 摘要 |
Method (400) and control unit (310) in a vehicle (100) having an ACC, system (500), for adjusting a variable time gap (t) to be kept to a preceding vehicle (110), based on a road slope (α). The method (400) comprises determining (401) geographical position of the vehicle (100); determining (402) driving direction (105) of the vehicle (100); determining (403) the road slope (α) of the road (120) in front of the vehicle (100) in the determined (402) driving direction (105); and adjusting (408) the variable time gap (t) based on the deter- mined (403) road slope (α) of the road (120) in front of the vehicle (100) by: increasing the variable time gap (t) when the road slope (α) is negative, indicating downhill; or decreasing the variable time gap (t) when the road slope (α) is positive, indicating uphill. |
