Method and control unit for adjusting a time gap
First Claim
1. A method for use in an adaptive cruise control, ACC, system of a first vehicle, for adjusting a variable time gap (t) to be kept to a second vehicle, the second vehicle preceding the first vehicle, based on a road slope (α
- ), wherein the method comprises;
determining a geographical position of the first vehicle;
determining a driving direction of the first vehicle;
determining the road slope (α
) of a road in front of the first vehicle in the determined driving direction;
adjusting the variable time gap (t) based on the determined road slope (α
) of the road in front of the first vehicle by;
increasing the variable time gap (t) when the road slope (α
) is negative, which indicates downhill;
ordecreasing the variable time gap (t) when the road slope (α
) is positive, which indicates uphill;
determining a determined road slope (β
) of the road at the determined geographical position of the first vehicle; and
further adjusting the variable time gap (t), based on a difference between the determined road slope (β
) at the first vehicle and the determined road slope (α
) in front of the first vehicle, by;
increasing the variable time gap (t) when the determined road slope (α
) in front of the first vehicle is smaller than the determined road slope (β
) at the first vehicle;
ordecreasing the variable time gap (t) when the determined road slope (α
) in front of the first vehicle exceeds the determined road slope (β
) at the first vehicle.
1 Assignment
0 Petitions
Accused Products
Abstract
A method (400) and a 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). In the method (400): 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 determined (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.
11 Citations
15 Claims
-
1. A method for use in an adaptive cruise control, ACC, system of a first vehicle, for adjusting a variable time gap (t) to be kept to a second vehicle, the second vehicle preceding the first vehicle, based on a road slope (α
- ), wherein the method comprises;
determining a geographical position of the first vehicle; determining a driving direction of the first vehicle; determining the road slope (α
) of a road in front of the first vehicle in the determined driving direction;adjusting the variable time gap (t) based on the determined road slope (α
) of the road in front of the first vehicle by;increasing the variable time gap (t) when the road slope (α
) is negative, which indicates downhill;
ordecreasing the variable time gap (t) when the road slope (α
) is positive, which indicates uphill;determining a determined road slope (β
) of the road at the determined geographical position of the first vehicle; andfurther adjusting the variable time gap (t), based on a difference between the determined road slope (β
) at the first vehicle and the determined road slope (α
) in front of the first vehicle, by;increasing the variable time gap (t) when the determined road slope (α
) in front of the first vehicle is smaller than the determined road slope (β
) at the first vehicle;
ordecreasing the variable time gap (t) when the determined road slope (α
) in front of the first vehicle exceeds the determined road slope (β
) at the first vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15)
- ), wherein the method comprises;
-
11. A control unit of an adaptive cruise control, ACC, system in a first vehicle, for adjusting a variable time gap (t) to be kept to a second vehicle, the second vehicle preceding the first vehicle, based on a road slope (α
- ), wherein the control unit is configured for;
determining a geographical position of the first vehicle via a positioning unit; determining a driving direction of the first vehicle; determining the road slope (α
) of the road in front of the first vehicle in the determined driving direction;adjusting the variable time gap (t) based on the determined road slope (α
) of the road in front of the first vehicle, the adjusting of the variable time gap (t) comprising;increasing the variable time gap (t) when the road slope (α
) is negative, indicating downhill;
ordecreasing the variable time gap (t) when the road slope (α
) is positive, indicating uphill, anddetermining the road slope (β
) of the road at the determined geographical position of the first vehicle;wherein the variable time gap (t) in the control unit is further adjusted, based on the difference between the determined road slope (β
) at the first vehicle and the determined road slope (α
) in front of the first vehicle, by;increasing the variable time gap (t) when the determined road slope (α
) in front of the first vehicle is smaller than the determined road slope (β
) at the first vehicle;
ordecreasing the variable time gap (t) when the determined road slope (α
) in front of the first vehicle exceeds the determined road slope (β
) at the first vehicle. - View Dependent Claims (13, 14)
- ), wherein the control unit is configured for;
Specification