Method for determining a change in air consumption for a combustion engine
First Claim
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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Abstract
In a method for determination of a change in volumetric efficiency for an internal combustion engine, a reference volumetric efficiency is determined in advance. A first actual volumetric efficiency value which corresponds to a sensor error, is then determined 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. A second actual volumetric efficiency value is determined at a second measurement point in a second rotational speed range that is greater than the first rotational speed range. The second actual volumetric efficiency value is corrected by means of the first actual volumetric efficiency value, and the change in volumetric efficiency is determined from the reference volumetric efficiency and the corrected second actual volumetric efficiency.
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Citations
9 Claims
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1. A method for determining a change in volumetric efficiency for an internal combustion engine, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification