Device and method for calculating a remaining mileage of an electric vehicle

An electric controller, comprising

• a sensor configured for obtaining a velocity;
• a battery gauge configured for obtaining an initial remaining battery power;
• a mileage device configured for determining a remaining mileage based on the velocity and the initial remaining battery power;
• and
• a display unit configured for displaying the remaining mileage.

A method for calculating remaining mileage, comprising:

• calculating, by an estimation calculator, a first battery power consumed over a first predetermined distance, wherein the first battery power is determined based on a velocity and a remaining battery power;
• calculating, by a mileage calculator, an estimated remaining mileage based on the first battery power, the first predetermined distance and a power balance;
• and
• smoothing, by a filter, the estimated remaining mileage and outputting the remaining mileage representing the smoothed estimated remaining mileage.