METHOD AND CONTROL ARRANGEMENT FOR CONTROLLING A SPEED OF A VEHICLE COMPRISING A REGENERATIVE BRAKE SYSTEM

A method (200) performed by a control arrangement for controlling a speed of a vehicle (100) comprising a regenerative brake system.The method (200) comprises, when travelling downhill, automatically applying a first brake force to control the speed of the vehicle to be maintained at a set speed level, Vmax, when this set speed level , Vmax, has been reached.Once the vehicle (100) approaches the end of a downhill road section (510) while the speed of the vehicle is controlled to be maintained at the set speed level, vmax, the applied brake force is adjusted (210) from the first brake force to a second brake force to accelerate the vehicle to an increased vehicle speed, vsch, exceeding the set speed level, vmax wherein the second brake force is applied by at least the regenerative brake system.Hereby, energy efficiency of the regenerative brake system is increased leading to increased vehicle efficiency and driving range.The invention relates also to a control arrangement (120), a vehicle (100) comprising the control arrangement (120), a computer program and a computer-readable medium.