Three-phase inverter control for electrified vehicles

摘要

Techniques are presented for more efficient three-phase inverter control for electrified vehicles (EVs). The techniques can be executed by a controller of an EV that includes one or more processors. Specifically, the techniques include closed-loop discontinuous pulse-width modulation (DPWM) control of a three-phase inverter based on electric motor current feedback. The three-phase inverter control techniques can be further based on electric motor/rotor position feedback. Based on the feedback, the techniques can select one of a plurality of zero-voltage vectors in real-time. The selected zero-voltage vector can be used when generating duty cycles for switching of the three-phase inverter, which can result in decreased switching losses and increased efficiency of the three-phase inverter.

主权项

1. A method, comprising:
determining, at a controller of an electrified vehicle (EV), the controller including one or more processors, three-phase AC currents at an electric motor of the EV, wherein the EV includes a three-phase inverter configured to convert a direct current (DC) from a battery system of the EV to the three-phase AC currents for the electric motor of the EV; sensing, at the controller via a position sensor, a rotational position of the electric motor; determining, at the controller, an output voltage vector based on the three-phase AC currents, reference currents, and the rotational position of the electric motor, wherein the reference currents are based on a torque request for the electric motor, a speed of the electric motor, and a DC voltage output by the battery system; selecting, at the controller, one of two zero-voltage vectors for the three-phase inverter based on the output voltage vector; and controlling, by the controller, switching of the three-phase inverter using the selected zero-voltage vector.