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METHOD FOR REDUCING DRIVELINE VIBRATION IN A HYBRID ELECTRIC VEHICLE POWERTRAIN

  • US 20060025906A1
  • Filed: 07/29/2005
  • Published: 02/02/2006
  • Est. Priority Date: 07/29/2004
  • Status: Active Grant
First Claim
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1. A method for attenuating dynamic oscillatory inertia torque disturbances in a powertrain for a hybrid electric vehicle, the powertrain having a first power source comprising an engine, a second power source comprising an electric motor electrically coupled to a battery and a generator, and gearing establishing mechanical power flow paths between the engine, the electric motor and the generator, the method comprising the steps of:

  • determining a desired vehicle wheel torque and an engine speed command in response to a driver demand for driving torque;

    determining a generator torque command as a function of the engine speed command;

    determining a motor torque command as a function of the desired vehicle wheel torque and the generator torque command;

    calculating an engine power estimate as a function of desired vehicle wheel torque, motor torque command and generator torque command; and

    filtering the engine power estimate using a weighted filtering factor that is dependent upon motor speed whereby oscillatory torque disturbances in the powertrain are attenuated.

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