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Method and system for controlling torque in an electric drive powertrain

  • US 9,227,525 B2
  • Filed: 10/14/2013
  • Issued: 01/05/2016
  • Est. Priority Date: 10/14/2013
  • Status: Active Grant
First Claim
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1. A method of controlling an electric drive powertrain system of a machine, the machine including an inverter, a transmission having a plurality of selectable gears, and a transmission control unit including a memory unit and a processor, comprising:

  • providing an electric motor capable of running between a motor minimum speed and a motor maximum speed, the electric motor configured to produce torque between a first region defined between the motor minimum speed and a motor base speed and a second region defined between the motor base speed and the motor maximum speed;

    receiving a signal from one or more operator control inputs;

    determining a desired transmission output torque based on the signal received from the one or more operator inputs;

    determining a desired motor torque based on the desired transmission output torque;

    while operating the electric motor in the first region, controllably operating the electric motor at a current less than or equal to an amount of current required at a maximum motor torque at the motor base speed; and

    producing a greater amount of torque at the motor base speed than an amount of torque produced at the motor minimum speed.

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