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METHOD AND SYSTEM FOR CONTROLLING A POWER INVERTER IN ELECTRIC DRIVES OF VEHICLES WITH TWO-MODE TRANSMISSIONS

  • US 20090107742A1
  • Filed: 10/24/2007
  • Published: 04/30/2009
  • Est. Priority Date: 10/24/2007
  • Status: Active Grant
First Claim
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1. A method for controlling a power inverter coupled to an electric motor in an electric drive system of an automobile, wherein the electric drive system includes a prime mover power source, a two-mode, compound-split, electro-mechanical transmission coupled to the prime mover power source, the transmission comprising a first motor and a second motor, wherein the power inverter is coupled to the first and second motors, the method comprising:

  • responsive to a commanded torque of the first motor being below a first torque level, controlling the power inverter to set a switching frequency of the power inverter at a first set frequency; and

    responsive to the commanded torque of the first motor being between the first torque level and a second torque level, controlling the power inverter to determine the switching frequency of the power inverter as a function of the commanded torque of the electric motor while maintaining the switching frequency above a dynamic frequency limit.

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