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Closed loop transmission torque control

  • US 8,473,170 B2
  • Filed: 09/17/2010
  • Issued: 06/25/2013
  • Est. Priority Date: 09/17/2010
  • Status: Active Grant
First Claim
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1. A method for providing, in a machine including a hydrostatic transmission, output torque control having situation-based system response, the method comprising:

  • maintaining a plurality of state-based gain schedules associated with situational states of the machine;

    determining machine operational values for the machine;

    determining, by a situational state calculator, a situational state of the machine based on the machine operational values;

    selecting, by a situational gain scheduler, a gain value based on the situational state of the machine, the selecting including at least specifying one of the plurality of state-based gain schedules based upon the situational state of the machine; and

    executing output torque control of the hydrostatic transmission via a closed loop control module and an open loop control module, wherein the closed loop control module applies the gain value to render a closed loop torque control output value.

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