US6981375B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbocharged internal combustion engine with EGR flow
Assignee: Detroit Diesel Corp
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Filing: 2003-09-16
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Granted: 2006-01-03
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Expires: 2023-09-16
Abstract
Abstract A turbocharged internal combustion engine is operated such that the intake manifold pressure generally exceeds the exhaust manifold pressure. A low pressure turbocharger and a high pressure turbocharger are provided in series. An exhaust gas recirculation (EGR) system passively routes a portion of the exhaust gases to the high pressure turbocharger compressor inlet.
Inventors
- 👤 Kevin Dean Sisken
- 👤 Brian Kenneth Bolton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:46
CPC Classifications
F; F02; F02B; F02B37/00; F02B37/013; F02B37/004; F02M; F02M26/00; F02M26/02; F02M26/08; F02M26/13; F02M26/35; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F02M26/14; F02M26/16; F02M26/22; F02M26/23; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
147 words
An internal combustion engine with a plurality of cylinders, the engine including an intake manifold and an exhaust manifold, the engine being operated such that the intake manifold pressure generally exceeds the exhaust manifold pressure, the engine further comprising: a low pressure turbocharger including a turbine driven by the exhaust gases and a compressor having an inlet receiving fresh intake air and an outlet providing low pressure charge air; a high pressure turbocharger including a turbine driven by the exhaust gases and a compressor having an inlet receiving the low pressure charge air and an outlet providing high pressure charge air to the intake manifold; an exhaust gas recirculation (EGR) system passively routing a portion of the exhaust gases to the high pressure turbocharger compressor inlet; and wherein a compression ratio of the low pressure turbocharger is greater than a compression ratio of the high pressure turbocharger.
Claim 2
Dependent Claim
147 words
An internal combustion engine with a plurality of cylinders, the engine including an intake manifold and an exhaust manifold, the engine being operated such that the intake manifold pressure generally exceeds the exhaust manifold pressure, the engine further comprising: a low pressure turbocharger including a turbine driven by the exhaust gases and a compressor having an inlet receiving fresh intake air and an outlet providing low pressure charge air; a high pressure turbocharger including a turbine driven by the exhaust gases and a compressor having an inlet receiving the low pressure charge air and an outlet providing high pressure charge air to the intake manifold; an exhaust gas recirculation (EGR) system passively routing a portion of the exhaust gases to the high pressure turbocharger compressor inlet; and wherein a compression ratio of the low pressure turbocharger is greater than a compression ratio of the high pressure turbocharger.
Claim 3
Dependent Claim
27 words
The internal combustion engine of claim 1 further comprising: a charge air cooler between the low pressure turbocharger compressor outlet and the high pressure turbocharger compressor inlet.
Claim 4
Dependent Claim
35 words
The internal combustion engine of claim 1 further comprising: a particulate filter located in the EGR system to filter particulate matter from the exhaust gases prior to introduction to the high pressure turbocharger compressor inlet.
Claim 5
Dependent Claim
32 words
The internal combustion engine of claim 1 further comprising: an EGR cooler located in the EGR system to cool the exhaust gases prior to introduction to the high pressure turbocharger compressor inlet.
Claim 6
Dependent Claim
64 words
The internal combustion engine of claim 1 further comprising: a particulate filter located in the EGR system to filter particulate matter from the exhaust gases prior to introduction to the high pressure turbocharger compressor inlet; and an EGR cooler located in the EGR system downstream of the particulate filter to cool the exhaust gases prior to introduction to the high pressure turbocharger compressor inlet.
Claim 7
Dependent Claim
97 words
The internal combustion engine of claim 1 further comprising: a charge air cooler between the low pressure turbocharger compressor outlet and the high pressure turbocharger compressor inlet; a particulate filter located in the EGR system to filter particulate matter from the exhaust gases prior to introduction to the high pressure turbocharger compressor inlet; and an EGR cooler located in the EGR system downstream of the particulate filter to cool the exhaust gases prior to introduction to the high pressure turbocharger compressor inlet, wherein the exhaust gases are introduced at a location downstream of the charge air cooler.
Claim 8
Dependent Claim
29 words
The internal combustion engine of claim 1 wherein the compression ratio of the low pressure turbocharger is greater than 1.5 times the compression ratio of the high pressure turbocharger.
Claim 9
Independent Claim
157 words
A method of controlling an internal combustion engine with a plurality of cylinders, the engine including an intake manifold and an exhaust manifold, the engine being operated such that the intake manifold pressure generally exceeds the exhaust manifold pressure, the engine including a low pressure turbocharger including a turbine driven by the exhaust gases and a compressor having an inlet receiving fresh intake air and an outlet providing low pressure charge air, and the engine further including a high pressure turbocharger including a turbine driven by the exhaust gases and a compressor having an inlet receiving the low pressure charge air and an outlet providing high pressure charge air to the intake manifold, the method further comprising: passively routing a portion of the exhaust gases to the high pressure turbocharger compressor inlet to provide exhaust gas recirculation, wherein a compression ratio of the low pressure turbocharger is greater than a compression ratio of the high pressure turbocharger.
Claim 10
Independent Claim
157 words
A method of controlling an internal combustion engine with a plurality of cylinders, the engine including an intake manifold and an exhaust manifold, the engine being operated such that the intake manifold pressure generally exceeds the exhaust manifold pressure, the engine including a low pressure turbocharger including a turbine driven by the exhaust gases and a compressor having an inlet receiving fresh intake air and an outlet providing low pressure charge air, and the engine further including a high pressure turbocharger including a turbine driven by the exhaust gases and a compressor having an inlet receiving the low pressure charge air and an outlet providing high pressure charge air to the intake manifold, the method further comprising: passively routing a portion of the exhaust gases to the high pressure turbocharger compressor inlet to provide exhaust gas recirculation, wherein a compression ratio of the low pressure turbocharger is greater than a compression ratio of the high pressure turbocharger.
Claim 11
Dependent Claim
28 words
The method of claim 8 further comprising: cooling the low pressure charge air from the low pressure turbocharger compressor outlet prior to the high pressure turbocharger compressor inlet.
Claim 12
Dependent Claim
24 words
The method of claim 8 further comprising: filtering particulate matter from the exhaust gases prior to introduction to the high pressure turbocharger compressor inlet.
Claim 13
Dependent Claim
21 words
The method of claim 8 further comprising: cooling the exhaust gases prior to introduction to the high pressure turbocharger compressor inlet.
Claim 14
Dependent Claim
41 words
The method of claim 8 further comprising: filtering particulate matter from the exhaust gases prior to introduction to the high pressure turbocharger compressor inlet; and after filtering, cooling the exhaust gases prior to introduction to the high pressure turbocharger compressor inlet.
Claim 15
Dependent Claim
74 words
The method of claim 8 further comprising: cooling the low pressure charge air from the low pressure turbocharger compressor outlet prior to the high pressure turbocharger compressor inlet; filtering particulate matter from the exhaust gases prior to introduction to the high pressure turbocharger compressor inlet; and after filtering, cooling the exhaust gases prior to introduction to the high pressure turbocharger compressor inlet, wherein the exhaust gases are introduced to cooled low pressure charge air.
Claim 16
Dependent Claim
27 words
The method of claim 8 wherein the compression ratio of the low pressure turbocharger is greater than 1.5 times the compression ratio of the high pressure turbocharger.
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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) | 2009-01-02 | 2009-07-04 | 2010-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2013-01-02 | 2013-07-04 | 2014-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2017-01-02 | 2017-07-04 | 2018-01-03 | $7700.00 | Window Closed / Lapsed |