Method for controlling an electric motor, electric motor driven vehicle, and method of gathering data of such a vehicle

The invention relates to a motor driven vehicle and a method for controlling it. This invention aims to provide a motor driven vehicle capable of effecting a constant running performance when the power source voltage is a predetermined value or greater. It is proposed that a motor driven vehicle comprises a battery 14, an electric motor 28 for driving wheels through the battery 14, and an electric motor control unit 30 for driving the electric motor 28, an