Method of estimating a propulsion-related operating parameter

A navigation system for a vehicle comprising:

• an interface unit providing an interface to a vehicle sensor system;
• a processing unit configured to estimate a propulsion-related operating parameter of the vehicle for a road segment by estimating at least one operating parameter of the vehicle for the road segment based on information provided for the road segment and estimating the propulsion-related operating parameter for the road segment on the basis of the at least one estimated operating parameter and using at least one vehicle specific parameter;
• the processing unit being further configured to determine the at least one vehicle specific parameter by:
• acquiring driving data to determine a plurality of vehicle operating parameters while the vehicle is in operation;
• using at least two of the determined vehicle operating parameters in a predetermined relationship that includes the at least one vehicle specific parameter;
• and
• determining the at least one vehicle specific parameter from the driving data for the at least two vehicle operating parameters and the relationship.

A non-transitory computer readable medium with an executable program stored in the medium, where the program performs the following steps when executed:

• estimating at least one operating parameter of the vehicle for the road segment based on information corresponding to the road segment;
• estimating a propulsion-related operating parameter for the road segment using the at least one estimated operating parameter and at least one vehicle specific parameter, where the at least one vehicle specific parameter is determined by:
• acquiring driving data to determine a plurality of vehicle operating parameters while the vehicle is in operation;
• using at least two of the determined vehicle operating parameters in a predetermined relationship that includes the at least one vehicle specific parameter;
• and
• determining the at least one vehicle specific parameter from the driving data for the at least two vehicle operating parameters and the relationship.