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Torque converter slip control for multi-displacement engine

  • US 7,288,046 B2
  • Filed: 03/21/2005
  • Issued: 10/30/2007
  • Est. Priority Date: 03/21/2005
  • Status: Active Grant
First Claim
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1. A method for controlling slip in a torque converter coupled to a multi-displacement engine, the method comprising:

  • enabling a predetermined slip rate offset to a base slip rate when the engine is operating in a full-displacement mode;

    after enabling the slip rate offset, transitioning the engine to a partial-displacement mode upon the earlier of (1) achieving a current slip rate equal to the base slip rate plus the slip rate offset, and (2) achieving an elapsed time since enabling that exceeds a predetermined maximum delay;

    maintaining the slip rate offset to the base slip rate when the engine is subsequently operating in the partial-displacement mode and when transitioning the engine back to the full-displacement mode; and

    disenabling the slip rate offset after transitioning the engine back to the full-displacement mode.

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