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Method and code for controlling reactivation of deactivatable cylinder using torque error integration

  • US 7,044,101 B1
  • Filed: 02/24/2005
  • Issued: 05/16/2006
  • Est. Priority Date: 02/24/2005
  • Status: Active Grant
First Claim
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1. A method for controlling a reactivation of a given deactivated cylinder of a multi-displacement internal combustion engine, the method comprising:

  • determining, while operating the engine in a partial-displacement mode characterized by deactivation of the given cylinder, a torque request based at least in part on a driver demand signal;

    estimating a maximum potential output torque for the engine when operating in a partial-displacement mode based at least in part on a first engine operating parameter;

    calculating a difference by which the torque request exceeds the maximum potential output torque;

    integrating the calculated differences over time to obtain a torque request error measure; and

    initiating a switch from the partial-displacement mode to a full-displacement mode characterized by activation of the deactivatable cylinder when the torque request error measure is not less than a first threshold value.

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