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Method to compensate for transmission spin loss for a hybrid powertrain system

  • US 8,165,777 B2
  • Filed: 10/14/2008
  • Issued: 04/24/2012
  • Est. Priority Date: 11/05/2007
  • Status: Active Grant
First Claim
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1. Method for controlling a powertrain system including an engine coupled to an input member of a hybrid transmission, the hybrid transmission operative to transmit torque between the input member and a torque generating machine and an output member, the hybrid transmission operative in one of a plurality of operating range states to transfer power between the input member and the torque generating machine and the output member, the method comprising:

  • monitoring an operator torque request;

    determining an output torque command and an output speed of the output member;

    selecting candidate operating range states;

    iteratively selecting candidate input speeds to the input member for each of the candidate operating range states;

    determining mechanical power loss in the hybrid transmission in each of the candidate operating range states for each of the candidate input speeds and the output speed;

    selecting a preferred input speed comprising the candidate input speed that achieves a minimum mechanical power loss in the hybrid transmission at the candidate operating range state for each of the selected operating range states at the output speed; and

    selecting a preferred operating range state comprising the candidate operating range state having the minimum preferred input speed at the output speed.

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