The present invention presents a method and a system for the management of changes in actual values for parameters that impact a driving resistance force F drivingres for a vehicle. The system comprises a model device, arranged to define a longitudinal vehicle model, wherein the model comprises representations of forces with horizontal effect on the vehicle in a valid driving condition. The system also comprises a determination device, arranged to determine whether a change in one or several of a representation of an actual rolling resistance force F act roll an actual mass m act for the vehicle has occurred, by determining whether the representation of the forces with horizontal effect on the vehicle cancel each other out when an estimated mass m est and a representation of an estimated rolling resistance force F est roll are introduced into the vehicle model. The system also comprises a utility device, arranged to use the determination of whether or not a change has occurred.
