US6480782B2
Expired / Lapsed
US
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System for managing charge flow and EGR fraction in an internal combustion engine
Assignee: Cummins Inc
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Filing: 2001-01-31
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Granted: 2002-11-12
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Expires: 2021-01-31
Abstract
Abstract A charge limit manager arbitrates between desired EGR system and/or turbocharger behavior and the actual capabilities of EGR system and/or turbocharger control mechanisms under current operating conditions. In one embodiment, the charge limit manager includes three limiter blocks producing offset signals as separate functions of turbocharger compressor outlet temperature, turbocharger speed and pressure differential (DELTAP) across an EGR valve. A charge limit selector block is responsive to the offset values produced thereby, and also to commanded values of charge flow and EGR fraction as well as operating values of EGR valve position and DELTAP, to limit the charge flow and EGR fraction commands to controllable values. These values are preferably subtracted from actual or estimated values of charge flow and EGR fraction to produce charge flow and EGR fraction error values for use in controlling one or more EGR system and/or turbocharger swallowing capacity/efficiency control mechanisms.
Inventors
- 👤 Larry J. Brackney
- 👤 Thomas A. Dollmeyer
- 👤 George Brunemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:22
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/005; F02D41/0052; F02D41/0065; F02D41/0072; F02M; F02M26/00; F02M26/45; F02M26/46; F02M26/47; F02B; F02B29/00; F02B29/04; F02B29/0406; F02M26/02; F02M26/04; F02M26/05; F02M26/09; F02M26/10; F02M26/13; F02M26/22; F02M26/23; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
104 words
A system for managing charge flow and EGR fraction in an internal combustion engine, comprising: a valve disposed between an exhaust manifold and an intake manifold of an internal combustion engine; means for determining a differential pressure across said valve resulting from flow of exhaust gas from said exhaust manifold to said intake manifold; a valve position sensor producing a position signal indicative of a position of said valve relative to a reference valve position; and a control circuit limiting a commanded EGR fraction value to a limited EGR fraction value as a function of said differential pressure signal and of said position signal.
Claim 2
Independent Claim
104 words
A system for managing charge flow and EGR fraction in an internal combustion engine, comprising: a valve disposed between an exhaust manifold and an intake manifold of an internal combustion engine; means for determining a differential pressure across said valve resulting from flow of exhaust gas from said exhaust manifold to said intake manifold; a valve position sensor producing a position signal indicative of a position of said valve relative to a reference valve position; and a control circuit limiting a commanded EGR fraction value to a limited EGR fraction value as a function of said differential pressure signal and of said position signal.
Claim 3
Dependent Claim
32 words
The system of claim 1 further including means responsive to said limited EGR fraction value and an actual EGR fraction value for producing an EGR fraction error corresponding to a difference therebetween.
Claim 4
Dependent Claim
98 words
The system of claim 1 wherein said control circuit includes: means for producing a first true value if either of said differential pressure signal is less than a differential pressure threshold value and said position signal is greater than a position signal threshold; means for producing a second true value if said commanded EGR fraction value is above an EGR fraction threshold; and means responsive to said first and second true values for limiting said commanded EGR fraction value to said limited EGR fraction value, and otherwise limiting said commanded EGR value to a constant EGR fraction value.
Claim 5
Dependent Claim
42 words
The system of claim 3 wherein said means responsive to said first and second true values includes a variable rate limiter rate limiting said commanded EGR fraction value in an EGR valve opening direction as a function of a slew rate value.
Claim 6
Dependent Claim
28 words
The system of claim 4 wherein said variable rate limiter is configured to inhibit rate limiting of said commanded EGR fraction value in an EGR valve closing direction.
Claim 7
Dependent Claim
77 words
The system of claim 4 further including a first limiter responsive to said differential pressure signal to produce a first penalty value; and wherein said control circuit is further operable to limit a commanded charge flow value to a limited charge flow value, said control circuit including means for limiting said commanded charge flow value to said limited charge flow value as a function of said first penalty value only in response to said second true value.
Claim 8
Independent Claim
119 words
A system for managing charge flow and EGR fraction in an internal combustion engine, comprising: a turbocharger for an internal combustion engine including a compressor supplying fresh air to an intake manifold of said engine; means for determining an outlet temperature of said compressor; a speed sensor producing a speed signal indicative of a rotational speed of said compressor; a first limiter producing a first penalty value as a function of said outlet temperature; a second limiter producing a second penalty value as a function of said speed signal; and a control circuit limiting a commanded charge flow value to a limited charge flow value as a function of at least one of said first and second penalty values.
Claim 9
Independent Claim
119 words
A system for managing charge flow and EGR fraction in an internal combustion engine, comprising: a turbocharger for an internal combustion engine including a compressor supplying fresh air to an intake manifold of said engine; means for determining an outlet temperature of said compressor; a speed sensor producing a speed signal indicative of a rotational speed of said compressor; a first limiter producing a first penalty value as a function of said outlet temperature; a second limiter producing a second penalty value as a function of said speed signal; and a control circuit limiting a commanded charge flow value to a limited charge flow value as a function of at least one of said first and second penalty values.
Claim 10
Dependent Claim
50 words
The system of claim 7 wherein said control circuit includes: means for selecting a maximum of said first and second penalty values; and means for producing as said limited charge flow value a difference between said commanded charge flow value and said maximum of said first and second penalty values.
Claim 11
Dependent Claim
32 words
The system of claim 7 further including means responsive to said limited charge flow value and an actual charge flow value for producing a charge flow error corresponding to a difference therebetween.
Claim 12
Dependent Claim
95 words
The system of claim 7 further including: a valve disposed between an exhaust manifold and said intake manifold of said engine; means for determining a differential pressure across said valve resulting from flow of exhaust gas from said exhaust manifold to said intake manifold; and a third limiter producing a third penalty value as a function of said differential pressure; and wherein said control circuit is operable to limit said commanded charge flow value to said limited charge flow value as a function of at least one of said first, second and third penalty values.
Claim 13
Dependent Claim
52 words
The system of claim 10 wherein said control circuit includes: means for selecting a maximum of said first, second and third penalty values; and means for producing as said limited charge flow value a difference between said commanded charge flow value and said maximum of said first, second and third penalty values.
Claim 14
Dependent Claim
67 words
The system of claim 10 further including means for producing a true signal in response to a commanded EGR fraction command exceeding an EGR fraction threshold value; and wherein said control circuit includes means responsive to said true signal for limiting said commanded charge flow value to said limited charge flow value as a function of said third penalty value, and otherwise inhibiting said third penalty value.
Claim 15
Dependent Claim
61 words
The system of claim 10 further including a valve position sensor producing a position signal indicative of a position of said valve relative to a reference valve position; and wherein said control circuit includes means for limiting a commanded EGR fraction value to a limited EGR fraction value as a function of said differential pressure signal and of said position signal.
Claim 16
Independent Claim
79 words
A system for managing charge flow and EGR fraction in an internal combustion engine, comprising: a turbocharger for an internal combustion engine including a compressor supplying fresh air to an intake manifold of said engine; means for determining an outlet temperature of said compressor; a limiter producing a penalty value as a function of said outlet temperature; and a control circuit limiting a commanded charge flow value to a limited charge value as a function of said penalty value.
Claim 17
Independent Claim
79 words
A system for managing charge flow and EGR fraction in an internal combustion engine, comprising: a turbocharger for an internal combustion engine including a compressor supplying fresh air to an intake manifold of said engine; means for determining an outlet temperature of said compressor; a limiter producing a penalty value as a function of said outlet temperature; and a control circuit limiting a commanded charge flow value to a limited charge value as a function of said penalty value.
Claim 18
Dependent Claim
31 words
The system of claim 14 wherein said control circuit includes means for producing said limited charge flow value as a difference between said commanded charge flow value and said penalty value.
Claim 19
Dependent Claim
99 words
The system of claim 14 further including: a valve disposed between an exhaust manifold and said intake manifold of said engine; means for determining a differential pressure across said valve resulting from flow of exhaust gas from said exhaust manifold to said intake manifold; and a valve position sensor producing a position signal indicative of a position of said valve relative to a reference valve position; and wherein said control circuit includes means for limiting said commanded EGR fraction value to a limited EGR fraction value as a function of said differential pressure signal and of said position signal.
Claim 20
Dependent Claim
33 words
The system of claim 14 further including means responsive to said limited charge flow value and an actual charge flow value for producing a charge flow error value corresponding to a difference therebetween.
Claim 21
Independent Claim
86 words
A system for managing charge flow and EGR fraction in an internal combustion engine, comprising: a turbocharger for an internal combustion engine including a compressor supplying fresh air to an intake manifold of said engine; a speed sensor producing a speed signal indicative of a rotational speed of said compressor; a limiter producing a penalty value as a function of said speed signal; and a control circuit limiting a commanded charge flow value to a limited charge flow value as a function of said penalty value.
Claim 22
Independent Claim
86 words
A system for managing charge flow and EGR fraction in an internal combustion engine, comprising: a turbocharger for an internal combustion engine including a compressor supplying fresh air to an intake manifold of said engine; a speed sensor producing a speed signal indicative of a rotational speed of said compressor; a limiter producing a penalty value as a function of said speed signal; and a control circuit limiting a commanded charge flow value to a limited charge flow value as a function of said penalty value.
Claim 23
Dependent Claim
31 words
The system of claim 18 wherein said control circuit includes means for producing said limited charge flow value as a difference between said commanded charge flow value and said penalty value.
Claim 24
Dependent Claim
99 words
The system of claim 18 further including: a valve disposed between an exhaust manifold and said intake manifold of said engine; means for determining a differential pressure across said valve resulting from flow of exhaust gas from said exhaust manifold to said intake manifold; and a valve position sensor producing a position signal indicative of a position of said valve relative to a reference valve position; and wherein said control circuit includes means for limiting a commanded EGR fraction value to a limited EGR fraction value as a function of said differential pressure signal and of said position signal.
Claim 25
Dependent Claim
33 words
The system of claim 18 further including means responsive to said limited charge flow value and an actual charge flow value for producing a charge flow error value corresponding to a difference therebetween.
Claim 26
Independent Claim
91 words
A system for managing charge flow and EGR fraction in an internal combustion engine, comprising: a valve disposed between an exhaust manifold and an intake manifold of an internal combustion engine; means for determining a differential pressure across said valve resulting from flow of exhaust gas from said exhaust manifold to said intake manifold; a limiter producing a penalty value as a function of said differential pressure; and a control circuit limiting a commanded charge flow value to a corresponding limited charge flow value as a function of said penalty value.
Claim 27
Independent Claim
91 words
A system for managing charge flow and EGR fraction in an internal combustion engine, comprising: a valve disposed between an exhaust manifold and an intake manifold of an internal combustion engine; means for determining a differential pressure across said valve resulting from flow of exhaust gas from said exhaust manifold to said intake manifold; a limiter producing a penalty value as a function of said differential pressure; and a control circuit limiting a commanded charge flow value to a corresponding limited charge flow value as a function of said penalty value.
Claim 28
Dependent Claim
31 words
The system of claim 22 wherein said control circuit includes means for producing said limited charge flow value as a difference between said commanded charge flow value and said penalty value.
Claim 29
Dependent Claim
61 words
The system of claim 22 further including a valve position sensor producing a position signal indicative of a position of said valve relative to a reference valve position; and wherein said control circuit includes means for limiting a commanded EGR fraction value to a limited EGR fraction value as a function of said differential pressure signal and of said position signal.
Claim 30
Dependent Claim
27 words
The system of claim 22 further including means responsive to said limited charge flow value and an actual charge flow value for producing a charge flow error
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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) | 2005-11-11 | 2006-05-13 | 2006-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-11-11 | 2010-05-13 | 2010-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-11-11 | 2014-05-13 | 2014-11-12 | $7700.00 | Window Closed / Lapsed |