Method and module for controlling a velocity of a vehicle

A method for regulating a vehicle's speed comprising:

• A) determining a horizon from position data and map data of an itinerary made up of route segments with length and gradient characteristics for each segment;
• B) calculating threshold values for the gradient of segments according to one or more vehicle-specific values, wherein the threshold values serve as boundaries for assigning segments to various categories;
• C) comparing the gradient of each segment with the threshold values and placing each segment within the horizon in a category according to the results of the comparisons;
• for each segment within the horizon which is in a category indicating a steep upgrade or a steep downgrade, the method comprises:
• D) calculating the vehicle's final speed vend after the end of the segment, based inter alia on the entry speed vi to the segment;
• and if the calculated final speed vend is outside the range for the vehicle's current reference speed vset defined by vmax and vmin, the method performs the step of
• E) correcting the entry speed vi for the segment on the basis of the calculated final speed vend for the segment, wherein the correction is defined by rules for the segment's category, so that vmin≦vend≦vmax, on the supposition that vi is corrected within the same range;
• F) regulating the vehicle's speed according to speed set-point values vref based on the entry speeds vi to each segment.