Method, host vehicle and following space management unit for managing following space

1. A method, performed by a following space management unit of a host vehicle, for managing a following space relating to a time for the host vehicle to reach a preceding vehicle location at which a preceding vehicle, preceding the host vehicle, is currently located, wherein the host vehicle is travelling with a velocity and has a current location on a road, and wherein the host vehicle is travelling in a current lane of the road, the method comprising:

obtaining a set of parameters comprising

a difference parameter indicating a difference between the velocity of and a road speed limit for the host vehicle at the current location; and

determining the following space based on the set of parameters, thereby controlling the following space.

2. The method according to claim 1 , wherein the set of parameters comprises:

an average following space parameter relating to an average time between a plurality of surrounding vehicles in the lane or lanes adjacent to the current lane, wherein the average time relates to average over those of the plurality of surrounding vehicles for which a respective following space has been determined.

3. The method according to claim 1 , wherein the determining of the following space comprises:

calculating the following space from the set of parameters by use of a formula.

4. The method according to claim 1 , wherein the following space is a recorded following space associated with the set of parameters according to a database including sets of parameters associated with recorded following spaces, wherein determining of the following space is performed by looking up the set of parameters in the database to find the recorded following space associated with the set of parameters.

5. The method according to claim 4 , wherein the recorded following spaces and the associated set of parameters are acquired when the following space management unit is active with respect to control of an estimated speed of the host vehicle according to a following space which is set manually, wherein the following space management unit is operating in a manual mode in which the following space is selected by a driver of the host vehicle out of a number of pre-set following spaces, or

wherein the recorded following spaces and the associated set of parameters are acquired when the following space management unit is inactive with respect to management of the following space.

6. A following space management unit for managing a following space relating to a time for a host vehicle to reach a preceding vehicle location at which a preceding vehicle, preceding the host vehicle, is currently located, wherein the host vehicle is travelling with a velocity and has a current location on a road, and wherein the host vehicle is travelling in a current lane of the road, the following space management unit configured to:

obtain a set of parameters comprising a difference parameter indicating a difference between the velocity of and a road speed limit for the host vehicle at the current location;

determine the following space based on the set of parameters; and

control the following space based on the determined following space.

7. The following space management unit according to claim 6 , wherein the set of parameters comprises:

an average following space parameter, relating to an average time between a plurality of surrounding vehicles in the lane or lanes adjacent to the current lane, wherein the average time relates to average over those of the plurality of surrounding vehicles for which a respective following space has been determined.

8. The following space management unit according to claim 6 , wherein the following space management is configured to calculate the following space from the set of parameters by use of a formula.

9. The following space management unit according to claim 6 , wherein the following space is a recorded following space associated with the set of parameters according to a database including sets of parameters associated with recorded following spaces, wherein the following space management unit is configured to determine the following space by looking up the set of parameters in the database to find the recorded following space associated with the set of parameters.

10. The following space management unit according to claim 9 , wherein the recorded following spaces and the associated set of parameters are acquired when the following space management unit is active with respect to control of the estimated speed of the host vehicle according to a manually set following space, wherein the following space management unit is operated in a manual mode in which the following space is selected by a driver of the host vehicle out of a number of pre-set following spaces, or

wherein the recorded following spaces and the associated set of parameters are acquired when the following space management unit is inactive with respect to management of the following space.

11. A host vehicle comprising a following space management unit according to claim 6 .

12. A non-transitory computer readable memory having computer executable instructions stored therein for managing a following space relating to a time for a host vehicle to reach a preceding vehicle location at which a preceding vehicle, preceding the host vehicle, is currently located, wherein the host vehicle is travelling with a velocity and has a current location on a road, and wherein the host vehicle is travelling in a current lane of the road, the computer executable instructions comprising instruction for:

obtaining a set of parameters comprising

a difference parameter indicating a difference between the velocity of and a road speed limit for the host vehicle at the current location; and

determining the following space based on the set of parameters for use in controlling the following space.