Internal combustion engine control
First Claim
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1. A method for generating a correction factor for correcting an internal combustion engine cylinder inlet air rate estimation, comprising the steps of:
- sensing engine inlet air rate;
diagnosing a steady state condition of the engine, by (a) sensing a value of a predetermined engine parameter indicative of engine intake manifold filling and depletion, (b) comparing the sensed value to a predetermined threshold value, and (c) diagnosing the steady state condition of the engine when the sensed value does not exceed the predetermined threshold value;
estimating cylinder inlet air rate when the steady state condition is diagnosed;
generating a value representing a deviation of the estimated cylinder inlet air rate away from the sensed engine inlet air rate when the steady state condition is diagnosed; and
generating a correction factor for correcting the internal combustion engine cylinder inlet air rate estimation as a predetermined function of the generated value.
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Abstract
Engine cylinder inlet air rate measurement is provided with minimization of system calibration and parameter measurement using a correction generated under steady state engine inlet air dynamic conditions through a comparison of mass airflow-based engine inlet air rate measurement and a nominal calculated cylinder inlet air rate. The correction may be periodically updated under steady state engine inlet air dynamic conditions and may be applied under all engine inlet air dynamic conditions, especially transient inlet air dynamic conditions.
91 Citations
8 Claims
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1. A method for generating a correction factor for correcting an internal combustion engine cylinder inlet air rate estimation, comprising the steps of:
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sensing engine inlet air rate; diagnosing a steady state condition of the engine, by (a) sensing a value of a predetermined engine parameter indicative of engine intake manifold filling and depletion, (b) comparing the sensed value to a predetermined threshold value, and (c) diagnosing the steady state condition of the engine when the sensed value does not exceed the predetermined threshold value; estimating cylinder inlet air rate when the steady state condition is diagnosed; generating a value representing a deviation of the estimated cylinder inlet air rate away from the sensed engine inlet air rate when the steady state condition is diagnosed; and generating a correction factor for correcting the internal combustion engine cylinder inlet air rate estimation as a predetermined function of the generated value. - View Dependent Claims (2, 3)
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4. A method for generating a correction factor for correcting an internal combustion engine cylinder inlet air rate estimation, comprising the steps of:
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sensing engine inlet air rate; diagnosing a steady state condition of the engine; estimating cylinder inlet air rate when the steady state condition is diagnosed, by (a) generating a nominal volumetric efficiency value, (b) sensing predetermined engine parameters, and (c) estimating engine cylinder inlet air rate as a predetermined function of the generated volumetric efficiency and the sensed predetermined engine parameters;
generating a value representing a deviation of the estimated cylinder inlet air rate away from the sensed engine inlet air rate when the steady state condition is diagnosed; andgenerating a correction factor for correcting the internal combustion engine cylinder inlet air rate estimation as a predetermined function of the generated value. - View Dependent Claims (5)
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6. A method for measuring internal combustion engine cylinder inlet air rate, comprising the steps of:
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sensing a predetermined set of engine parameters; determining a nominal volumetric efficiency value as a predetermined function of the predetermined set of engine parameters; sensing engine inlet air rate; sensing a presence of a steady state engine intake air dynamic condition; determining a correction factor when the steady state engine intake air dynamic condition is sensed to be present, by (a) generating a value representing engine cylinder inlet air rate, (b) calculating a deviation value indicating the degree of deviation of the generated value away from the sensed engine inlet air rate, and (c) determining the correction factor as a predetermined function of the calculated deviation value; correcting the nominal volumetric efficiency value when the steady state engine intake air condition is not sensed to be present by applying the correction factor to the nominal volumetric efficiency value; and measuring the engine cylinder inlet air rate as a predetermined function of the corrected nominal volumetric efficiency value. - View Dependent Claims (7, 8)
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Specification