Patent ID: 8610390

Claim:
A method for controlling torque of an electric motor driven vehicle, comprising: receiving a current speed of a drive motor, a speed boundary section, a target torque, a drive torque limit and a generation torque limit; calculating a ratio of the current speed in the entire speed boundary section as a mixture ratio when the current speed is within the speed boundary section; calculating a limit torque, reflecting the drive torque limit and the generation torque limit in the calculated mixture ratio; and selecting whichever of the limit torque and the target torque is smaller in absolute value as a final torque that is required of the drive motor wherein the speed boundary section comprises a lowest boundary limit and an uppermost boundary limit, and the calculating of the ratio of the current speed comprises calculating the mixture ratio using equation 1: mixture ⁢ ⁢ ratio = current ⁢ ⁢ speed × sgn ⁡ ( target ⁢ ⁢ torque ) - lowest ⁢ ⁢ boundary ⁢ ⁢ limit ⁢ ⁢ value Δ ⁢ ⁢ speed ⁢ ⁢ boundary ⁢ ⁢ section in which “sgn” is a mathematical expression that extracts the sign of the real target torque.