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Control system for variable-cylinder internal combustion engine

  • US 20060107919A1
  • Filed: 11/17/2005
  • Published: 05/25/2006
  • Est. Priority Date: 11/22/2004
  • Status: Active Grant
First Claim
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1. A control system for a variable-cylinder internal combustion engine which is operated by switching an operation mode between an all-cylinder operation mode in which all of a plurality of cylinders are put in operation and a partial-cylinder operation mode in which some of the plurality of cylinders are deactivated, comprising:

  • load-detecting means for detecting load on the engine;

    first switching determination means for determining that the operation mode should be switched to the all-cylinder operation mode, when the detected load on the engine is larger than a first reference value, during the partial-cylinder operation mode;

    degree-of-continuation parameter-calculating means for calculating a degree-of-continuation parameter indicative of a degree of continuation of a state where the load on the engine is within a predetermined range of load between the first reference value and a second reference value smaller than the first reference value, during the partial-cylinder operation mode;

    second switching determination means for determining based on the calculated degree-of-continuation parameter whether or not the operation mode should be switched to the all-cylinder operation mode; and

    switching execution means for executing switching from the partial-cylinder operation mode to the all-cylinder operation mode based on results of determinations by said first switching determination means and said second switching determination means.

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