Active Traction Motor Harmonic Masking Using Random Switching Frequency Process

Abstract

An automotive control system includes a controller for use with an inverter configured to drive a traction motor with electrical energy from a traction battery. The controller is programmed to select a base switching frequency for a control signal for the inverter such that a switching noise sideband frequency of the inverter is the same as a harmonic frequency of the traction motor, modify the selected base switching frequency by a random switching frequency to obtain a modified switching frequency, and control the inverter with the control signal having the modified switching frequency for the inverter to drive the traction motor.

Dependencies are inferred from the claim text.