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Method for determining a change in air consumption for a combustion engine

  • US 7,181,335 B2
  • Filed: 08/26/2003
  • Issued: 02/20/2007
  • Est. Priority Date: 09/12/2002
  • Status: Expired due to Fees
First Claim
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1. A method for determining a change in volumetric efficiency for an internal combustion engine, comprising:

  • first, determining a reference volumetric efficiency;

    thereafter determining a first actual volumetric efficiency value from a first measured value at a first measurement point in a first rotational speed range in which a change in the flow losses in an intake tract has only a minor effect on the volumetric efficiency;

    determining a second actual volumetric efficiency value from a second measured value at a second measurement point in a second rotational speed range which is greater than the first rotational speed range in terms of rotational speed;

    correcting the second actual volumetric efficiency value based on first actual volumetric efficiency value; and

    determining change in volumetric efficiency based on the reference volumetric efficiency and the corrected second actual volumetric efficiency value.

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