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METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE FOR A HYBRID POWERTRAIN SYSTEM

  • US 20090118914A1
  • Filed: 10/18/2008
  • Published: 05/07/2009
  • Est. Priority Date: 11/05/2007
  • Status: Active Grant
First Claim
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1. A method for operating a hybrid powertrain system including an internal combustion engine operatively connected to a second torque machine to transmit torque to an output member, the method comprising:

  • monitoring an operator torque request;

    determining an output torque command based upon the operator torque request;

    commanding a transition between an engine-off state and an engine-on state;

    monitoring an engine crank angle;

    spinning the engine unfueled;

    estimating cylinder pressure based upon the engine crank angle during the spinning of the engine;

    predicting a cylinder pulse torque based upon the cylinder pressure;

    determining a cancellation torque for the second torque machine based upon the predicted cylinder pulse torque; and

    controlling motor torque output from the second torque machine based upon the cancellation torque and the output torque command.

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