US5465617A
Expired / Lapsed
US
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Internal combustion engine control
Assignee: GM Global Technology Operations LLC
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Filing: 1994-03-25
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Granted: 1995-11-14
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Expires: 2014-03-25
Abstract
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.
Inventors
- 👤 Kenneth P. Dudek
- 👤 Gregory P. Matthews
- 👤 Charles H. Folkerts
- 👤 Ronald A. Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:55
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/18; F02D41/30; F02D41/32; F02D2200/00; F02D2200/02; F02D2200/04; F02D2200/0402; F02D2200/0411
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
148 words
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.
Claim 2
Independent Claim
148 words
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.
Claim 3
Dependent Claim
16 words
The method of claim 1, wherein the predetermined parameter corresponds to engine intake manifold air pressure.
Claim 4
Dependent Claim
15 words
The method of claim 1, wherein the sensed value corresponds to a rate of change.
Claim 5
Independent Claim
135 words
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; 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; and generating a correction factor for correcting the internal combustion engine cylinder inlet air rate estimation as a predetermined function of the generated value.
Claim 6
Independent Claim
135 words
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; 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; and generating a correction factor for correcting the internal combustion engine cylinder inlet air rate estimation as a predetermined function of the generated value.
Claim 7
Dependent Claim
20 words
The method of claim 4, wherein the predetermined engine parameters include engine intake manifold pressure and engine intake air temperature.
Claim 8
Independent Claim
172 words
A method for measuring internal combustion engine cylinder inlet air rate, comprising the steps of: 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.
Claim 9
Independent Claim
172 words
A method for measuring internal combustion engine cylinder inlet air rate, comprising the steps of: 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.
Claim 10
Dependent Claim
73 words
The method of claim 6, wherein the step of sensing a presence of a steady state engine intake air dynamic condition further comprises the steps of; sensing a parameter indicating a degree of change in air volume in an engine intake manifold; comparing the sensed parameter to a predetermined threshold value; and sensing the presence of the steady state air dynamic condition when the sensed parameter does not exceed the predetermined threshold value.
Claim 11
Dependent Claim
20 words
The method of claim 6, wherein the predetermined set of engine parameters includes engine intake manifold pressure and engine speed.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-11-13 | 1999-05-15 | 1999-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-11-13 | 2003-05-15 | 2003-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-11-13 | 2007-05-15 | 2007-11-14 | $7700.00 | Window Closed / Lapsed |