US5537977A
Expired / Lapsed
US
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Method of estimating exhaust gas recirculation in an intake manifold for an internal combustion engine
Assignee: FCA US LLC
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Filing: 1995-01-30
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Granted: 1996-07-23
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Expires: 2015-01-30
Abstract
Abstract A method of estimating exhaust gas recirculation in an intake manifold for an internal combustion engine includes the steps of determining a volumetric efficiency value of the intake manifold, determining whether a speed of the engine is accelerating, getting a manifold unfilling constant if the speed of the engine is not accelerating, getting a manifold filling constant if the speed of the engine is accelerating, calculating a K-factor based on the volumetric efficiency value and either the manifold filling constant or manifold unfilling constant, and using the K-factor to modify spark of the engine.
Inventors
- 👤 Peter G. Hartman
- 👤 Keith L. Jones
- 👤 Thomas A. Larson
- 👤 Gregory T. Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:16
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P5/1502; F02P5/1516; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
101 words
A method of estimating exhaust gas recirculation in an intake manifold for an internal combustion engine, said method comprising the steps of: determining a volumetric efficiency value of an intake manifold for an internal combustion engine; determining whether a speed of the engine is accelerating; getting a manifold unfilling constant if the speed of the engine is not accelerating; getting a manifold filling constant if the speed of the engine is accelerating; calculating a K-factor based on the volumetric efficiency value and either the manifold filling constant or manifold unfilling constant; and using the K-factor to modify spark of the engine.
Claim 2
Independent Claim
101 words
A method of estimating exhaust gas recirculation in an intake manifold for an internal combustion engine, said method comprising the steps of: determining a volumetric efficiency value of an intake manifold for an internal combustion engine; determining whether a speed of the engine is accelerating; getting a manifold unfilling constant if the speed of the engine is not accelerating; getting a manifold filling constant if the speed of the engine is accelerating; calculating a K-factor based on the volumetric efficiency value and either the manifold filling constant or manifold unfilling constant; and using the K-factor to modify spark of the engine.
Claim 3
Dependent Claim
33 words
A method as set forth in claim 1 including the step of multiplying the volumetric efficiency value by a current engine speed prior to said step of determining whether the engine is accelerating.
Claim 4
Dependent Claim
34 words
A method as set forth in claim 1 including the step of calculating a current estimate of exhaust gas recirculation in the intake manifold prior to said step of determining the volumetric efficiency value.
Claim 5
Dependent Claim
39 words
A method as set forth in claim 1 wherein said step of calculating comprises dividing a product of the volumetric efficiency value multiplied by a speed of the engine by either the manifold filling constant or manifold unfilling constant.
Claim 6
Dependent Claim
33 words
A method as set forth in claim 1 wherein said step of determining the volumetric efficiency value comprises using a current manifold absolute pressure to look-up a volumetric efficiency value from a table.
Claim 7
Independent Claim
133 words
A method of estimating exhaust gas recirculation in an intake manifold for an internal combustion engine, said method comprising the steps of: calculating a current estimate of exhaust gas recirculation in an intake manifold for an internal combustion engine; determining a volumetric efficiency value for the intake manifold from a look-up table using a current manifold absolute pressure; determining whether a speed of the engine is accelerating; getting a manifold unfilling constant if the speed of the engine is not accelerating; getting a manifold filling constant if the speed of the engine is accelerating; dividing a product of the volumetric efficiency value multiplied by a speed of the engine by either the manifold filling constant or manifold unfilling constant to obtain a K-factor; and using the K-factor to modify spark of the engine.
Claim 8
Independent Claim
133 words
A method of estimating exhaust gas recirculation in an intake manifold for an internal combustion engine, said method comprising the steps of: calculating a current estimate of exhaust gas recirculation in an intake manifold for an internal combustion engine; determining a volumetric efficiency value for the intake manifold from a look-up table using a current manifold absolute pressure; determining whether a speed of the engine is accelerating; getting a manifold unfilling constant if the speed of the engine is not accelerating; getting a manifold filling constant if the speed of the engine is accelerating; dividing a product of the volumetric efficiency value multiplied by a speed of the engine by either the manifold filling constant or manifold unfilling constant to obtain a K-factor; and using the K-factor to modify spark of the engine.
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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) | 1999-07-23 | 2000-01-22 | 2000-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-23 | 2004-01-22 | 2004-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-23 | 2008-01-22 | 2008-07-23 | $7700.00 | Window Closed / Lapsed |