Patent ID: 8100799

Claim:
An automotive drive system comprising: a prime mover power source; a two-mode, compound-split, electro-mechanical transmission coupled to the prime mover power source, the transmission comprising first and second motors; a power inverter coupled to the first and second motors; and a processor coupled to the first and second motors and the power inverter, the processor being configured to modify a signal controlling the power inverter utilizing a first voltage distortion compensation method if a modulation index of the signal is less than a first modulation index value; modify the signal utilizing a second voltage distortion compensation method if the modulation index is at least equal to the first modulation index value wherein the processor is further configured to: modify the signal utilizing a third voltage distortion compensation method if the modulation index is at least equal to a second modulation index value and a switching frequency of the power inverter is at a maximum value, wherein the second modulation index value is greater than the first modulation index value; and modify the signal utilizing the first voltage distortion compensation method if the modulation index is at least equal to the second modulation index value and the switching frequency of the power inverter is not at the maximum value.