| 摘要 |
A method for controlling an electric vehicle includes computing an electric motor RPM based on a computed Back Electromotive Force (BEMF). Modern electric vehicle designs include intelligent control of the electric motors and transmissions to respond to operator controls and provide efficient operation to extend battery life. An accurate measure of motor RPM is required for such control. Various methods are available for obtaining motor RPM, but most require external sensors susceptible to damage from road debris and the like. The BEMF is proportional to motor speed and independent of motor load. The BEMF may further be computed from the difference between IR loss and motor voltage. The motor RPM is them computed from BEMF using data recorded for the individual motor. |
