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Reducing torque disturbances and improving fuel economy in hybrid electric powertrains

  • US 7,530,413 B2
  • Filed: 08/13/2004
  • Issued: 05/12/2009
  • Est. Priority Date: 08/13/2004
  • Status: Expired due to Fees
First Claim
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1. A method of transitioning between activated and deactivated modes in a hybrid powertrain driven by a displacement on demand engine and an electric machine, comprising:

  • calculating a desired powertrain torque;

    determining a maximum electric machine torque output;

    reducing an engine torque output by said maximum electric machine torque output;

    increasing an electric machine torque output to achieve said desired powertrain torque;

    deactivating cylinders of said engine, and;

    increasing said engine torque output and reducing said electric machine torque output to maintain said desired powertrain torque after said step of deactivating cylinders of said engine.

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