Route navigation with optimal speed profile

A method for optimizing energy consumption of a vehicle, comprising:

• assembling road segments in a navigation system into a route from a first position to a destination;
• evaluating an energy consumption model of the vehicle together with road grade data corresponding to the route to calculate an optimal speed profile that specifies target speeds for respective locations on the route for traversing the route with an optimized energy consumption, wherein energy consumption is compared for a plurality of feasible speed profile trajectories between a maximum trajectory and a minimum trajectory in order to identify the optimal speed profile, wherein the evaluating is performed off of the vehicle by a remote server, and wherein the vehicle communicates wirelessly with the remote server to receive the optimal speed profile;
• indicating to a driver on an HMI device a specified target speed or a speed change to be made to obtain the specified target speed in response to a current position of the vehicle and the optimal speed profile:,
• determining an acceptance rate of the target speed by a driver by comparing an actual speed with an acceptance zone around the target speed in a processor;
• and
• if the determined acceptance rate is below a threshold, then recalculating the optimal speed profile using revised maximum and minimum trajectories that are selected to increase the acceptance rate.

A system for optimizing energy consumption of a vehicle, comprising:

• a route calculator for assembling road segments into a route from a first position to a destination;
• a speed profile generator located at least partially off of the vehicle and using an energy consumption model of the vehicle together with road grade data corresponding to the route to calculate an optimal speed profile that specifies target speeds for respective locations on the route for traversing the route with an optimized energy consumption, wherein the speed profile generator compares energy consumption for a plurality of feasible speed profile trajectories between a maximum trajectory and a minimum trajectory in order to identify the optimal speed profile;
• a speed updater responsive to a current position of the vehicle and the optimal speed profile to initiate a target speed specified for the current position, the speed updater is comprised of an HMI device for indicating to a driver the target speed or a speed change to be made to obtain the target speed;
• and
• a monitor for determining an acceptance rate of the target speed by the driver;
• wherein, if the determined acceptance rate is below a threshold, then the speed profile generator recalculates the optimal speed profile using revised maximum and minimum trajectories that are selected to increase the acceptance rate.