System and method for improving acceleration performance of an electric vehicle

摘要

Systems and methods are disclosed for improving acceleration performance of an electric vehicle that includes an electric motor for propulsion. An exemplary system may include an inverter configured to drive the electric motor. The inverter may include at least one power electronic device. The system may also include a torque capability controller. The torque capability controller may be configured to receive information indicative of a selection between a first mode and a second mode. The second mode may correspond to a higher torque to be output by the electric motor than the first mode. The torque capability controller may also be configured to apply a switching frequency to the at least one power electronic device. The switching frequency may have a lower value when the received information indicates the selection of the second mode than when the received information indicates the selection of the first mode.

主权项

1. A system for controlling an electric motor, comprising:
an inverter configured to drive the electric motor, the inverter including at least one power electronic device; and a torque capability controller configured to:
receive information indicative of a selection between a first mode and a second mode, the second mode corresponding to a higher torque to be output by the electric motor than the first mode; andapply a switching frequency to the at least one power electronic device, the switching frequency having a lower value when the received information indicates the selection of the second mode than when the received information indicates the selection of the first mode; wherein when the received information indicates the selection of the second mode, the torque capability controller is configured to:
maintain the switching frequency applied to the at least one power electronic device before a rotational speed of the electric motor reaches a threshold speed; andincrease the switching frequency when the rotational speed of the electric motor exceeds the threshold speed;wherein the threshold speed is determined based on a pulse ratio indicating a ratio between the switching frequency and a fundamental frequency of the electric motor.