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Method and apparatus to create a pseudo torque phase during oncoming clutch engagement to prevent clutch slip for a hybrid powertrain system

  • US 8,282,526 B2
  • Filed: 10/13/2008
  • Issued: 10/09/2012
  • Est. Priority Date: 10/29/2007
  • Status: Active Grant
First Claim
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1. Method for controlling a powertrain comprising an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine adapted to selectively transmit mechanical power to an output member through selective application of a plurality of torque-transfer clutches, the method comprising:

  • monitoring a clutch slip speed;

    synchronizing an oncoming clutch; and

    constraining reactive clutch torque limits for said oncoming clutch to achieve a reactive clutch torque that is less than an estimated clutch torque capacity.

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