The invention relates to a method for controlling (1) an energy equivalence factor (K) of a motor vehicle including a heat engine and at least one electric motor powered by a storage battery, the method including a step (2) of estimating a value (Kcalc) of said energy equivalence factor (K) proportional to a predetermined maximum value (Kmax) when said difference (σ) is lower than said threshold value (εsoe, -εsoe), or proportional to a predetermined minimum value (Kmin) when said difference (σ) is higher than said threshold value (εsoe, -εsoe).
