Patent US6820599B2 successfully refreshed from Google Patents.
US6820599B2
Expired / Lapsed
US
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System and method for reducing Nox emissions during transient conditions in a diesel fueled vehicle with EGR
Assignee: Ford Global Technologies LLC
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Filing: 2003-02-03
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Granted: 2004-11-23
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Expires: 2023-02-03
Abstract
Abstract The present invention is a dual-stage fuel injection strategy for compression ignition engines in which 15-40% of the fuel is injected into the combustion chamber no later than about -20 to -30 CA ATDC and as early as IVC. The remaining fuel is then injected in one or more fuel pulses, none of which start before about -20 to -30 CA ATDC. The fuel injected early in the compression stroke forms a lean mixture that burns with low soot and low NOx emissions. The combustion of that fuel serves to increase in-cylinder temperature such that the ignition delay of subsequent fuel injection pulses is short. This mode is utilized when it is predicted that a NOx spike is imminent. Various other alternative methods for reducing NOx spikes are also disclosed such as specialized EGR systems that can provide EGR with low manifold vacuum.
Inventors
- 👤 Eric Matthew Kurtz
- 👤 John H. Vanderslice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:43
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/005; F02B; F02B1/00; F02B1/12; F02B23/00; F02B23/02; F02B23/06; F02B23/0696; F02D41/30; F02D41/38; F02D41/40; F02D41/402; F02D41/403; F02M; F02M26/00; F02M26/02; F02M26/04; F02M26/05; F02M26/06; F02M26/07; F02M26/13; F02M26/22; F02M26/23; F02M26/24; F02B2275/00; F02B2275/14; F02B29/00; F02B29/04; F02B29/0406; F02B3/00; F02B3/06; F02D41/0065; F02M26/28; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
154 words
A system for an engine having an intake and exhaust manifold, the engine having a compression device coupled with a first portion coupled to the intake and a second portion coupled to the exhaust manifold of the engine, the system comprising: a first exhaust gas recirculation system having a first end coupled to the exhaust manifold upstream of the second portion of the compression device and a second end coupled to the intake manifold downstream of the first portion compression device, said first system also having a first valve that adjusts a first flow amount from the exhaust manifold to the intake manifold; and a second exhaust gas recirculation system having a first end coupled downstream of the second portion of the compression device and a second end coupled to the intake manifold, said first system also having a second valve that adjusts a second flow amount from the exhaust to the intake manifold.
Claim 2
Independent Claim
154 words
A system for an engine having an intake and exhaust manifold, the engine having a compression device coupled with a first portion coupled to the intake and a second portion coupled to the exhaust manifold of the engine, the system comprising: a first exhaust gas recirculation system having a first end coupled to the exhaust manifold upstream of the second portion of the compression device and a second end coupled to the intake manifold downstream of the first portion compression device, said first system also having a first valve that adjusts a first flow amount from the exhaust manifold to the intake manifold; and a second exhaust gas recirculation system having a first end coupled downstream of the second portion of the compression device and a second end coupled to the intake manifold, said first system also having a second valve that adjusts a second flow amount from the exhaust to the intake manifold.
Claim 3
Dependent Claim
18 words
The system recited in claim 1 further comprising a controller electrically coupled to said first and second valve.
Claim 4
Dependent Claim
40 words
The system recited in claim 2 wherein said controller determines engine operating conditions, and actuates both said first and second valve during a first mode, and only said second valve during a second mode based on said determined operating conditions.
Claim 5
Dependent Claim
40 words
The system recited in claim 3 wherein the engine is a diesel engine, and wherein said second end of said second exhaust gas recirculation system is coupled to the intake manifold downstream of the first portion of the compression device.
Claim 6
Independent Claim
108 words
A system for an internal combustion engine, comprising: a first exhaust gas recirculation path for introducing a first amount of burnt exhaust gas into an intake manifold of the engine; a first valve located in said first path; a second exhaust gas recirculation path for introducing a second amount of burnt exhaust gas into an intake manifold of the engine; a second valve located in said second path; a compression device powered by exhaust flow that raises manifold pressure; and a controller for determining an engine load condition associated with decreased NOx emissions, and controlling both said first and second valve to be open during said decreased NOx.
Claim 7
Independent Claim
108 words
A system for an internal combustion engine, comprising: a first exhaust gas recirculation path for introducing a first amount of burnt exhaust gas into an intake manifold of the engine; a first valve located in said first path; a second exhaust gas recirculation path for introducing a second amount of burnt exhaust gas into an intake manifold of the engine; a second valve located in said second path; a compression device powered by exhaust flow that raises manifold pressure; and a controller for determining an engine load condition associated with decreased NOx emissions, and controlling both said first and second valve to be open during said decreased NOx.
Claim 8
Dependent Claim
25 words
The system of claim 5 wherein said controller further controls only one of said first and second valve to be open during increased NOx conditions.
Claim 9
Independent Claim
154 words
A system for a diesel engine, comprising: a turbine coupled to an exhaust side of the engine; a compressor coupled to an intake side of the engine; a first exhaust gas recirculation path from the exhaust side of the engine to the intake side of the engine, the first exhaust gas recirculation path having an exhaust portion and an intake portion, the exhaust portion coupled to the exhaust side of the engine upstream of the turbine and the intake portion coupled to the intake side of the engine downstream of the compressor; and a second exhaust gas recirculation path from the exhaust side of the engine to the intake side of the engine, the second exhaust gas recirculation path having an exhaust portion and an intake portion, the exhaust portion coupled to the exhaust side of the engine downstream of the turbine and the intake portion coupled to the intake side of the engine.
Claim 10
Independent Claim
154 words
A system for a diesel engine, comprising: a turbine coupled to an exhaust side of the engine; a compressor coupled to an intake side of the engine; a first exhaust gas recirculation path from the exhaust side of the engine to the intake side of the engine, the first exhaust gas recirculation path having an exhaust portion and an intake portion, the exhaust portion coupled to the exhaust side of the engine upstream of the turbine and the intake portion coupled to the intake side of the engine downstream of the compressor; and a second exhaust gas recirculation path from the exhaust side of the engine to the intake side of the engine, the second exhaust gas recirculation path having an exhaust portion and an intake portion, the exhaust portion coupled to the exhaust side of the engine downstream of the turbine and the intake portion coupled to the intake side of the engine.
Claim 11
Dependent Claim
34 words
The system recited in claim 7 wherein said first exhaust gas recirculation path includes a first control valve coupled between the exhaust portion and the intake portion of the first exhaust gas recirculation path.
Claim 12
Dependent Claim
34 words
The system recited in claim 7 wherein said second exhaust gas recirculation path includes a second control valve coupled between the exhaust portion and the intake portion of the second exhaust gas recirculation path.
Claim 13
Dependent Claim
22 words
The system recited in claim 7 further comprising a catalyst coupled to the exhaust side of the engine downstream of the turbine.
Claim 14
Dependent Claim
23 words
The system recited in claim 7 further comprising a particulate filter coupled to the exhaust side of the engine downstream of the turbine.
Claim 15
Dependent Claim
30 words
The system recited in claim 7 wherein said intake portion of the second exhaust gas recirculation path is coupled to said intake side of the engine upstream of the compressor.
Claim 16
Dependent Claim
30 words
The system recited in claim 7 wherein said intake portion of the second exhaust gas recirculation path is coupled to said intake side of the engine downstream of the compressor.
Claim 17
Dependent Claim
17 words
The system recited in claim 13 further comprising a throttle on the intake side of the engine.
Claim 18
Independent Claim
158 words
A system for a diesel engine, comprising: a turbine coupled to an exhaust side of the engine; a compressor coupled to an intake side of the engine; a first exhaust gas recirculation path from the exhaust side of the engine to the intake side of the engine, the first exhaust gas recirculation path having an exhaust portion and an intake portion, the exhaust portion coupled to the exhaust side of the engine upstream of the turbine and the intake portion coupled to the intake side of the engine downstream of the compressor; and a second exhaust gas recirculation path from the exhaust side of the engine to the intake side of the engine, the second exhaust gas recirculation path having an exhaust portion and an intake portion, the exhaust portion coupled to the exhaust side of the engine downstream of the turbine and the intake portion coupled to the intake side of the engine downstream of the compressor.
Claim 19
Independent Claim
158 words
A system for a diesel engine, comprising: a turbine coupled to an exhaust side of the engine; a compressor coupled to an intake side of the engine; a first exhaust gas recirculation path from the exhaust side of the engine to the intake side of the engine, the first exhaust gas recirculation path having an exhaust portion and an intake portion, the exhaust portion coupled to the exhaust side of the engine upstream of the turbine and the intake portion coupled to the intake side of the engine downstream of the compressor; and a second exhaust gas recirculation path from the exhaust side of the engine to the intake side of the engine, the second exhaust gas recirculation path having an exhaust portion and an intake portion, the exhaust portion coupled to the exhaust side of the engine downstream of the turbine and the intake portion coupled to the intake side of the engine downstream of the compressor.
Claim 20
Dependent Claim
34 words
The system recited in claim 15 wherein said first exhaust gas recirculation path includes a first control valve coupled between the exhaust portion and the intake portion of the first exhaust gas recirculation path.
Claim 21
Dependent Claim
34 words
The system recited in claim 15 wherein said second exhaust gas recirculation path includes a second control valve coupled between the exhaust portion and the intake portion of the second exhaust gas recirculation path.
Claim 22
Dependent Claim
22 words
The system recited in claim 15 further comprising a catalyst coupled to the exhaust side of the engine downstream of the turbine.
Claim 23
Dependent Claim
23 words
The system recited in claim 15 further comprising a particulate filter coupled to the exhaust side of the engine downstream of the turbine.
Claim 24
Dependent Claim
22 words
The system recited in claim 15 further comprising an intercooler coupled to the intake side of the engine downstream of the compressor.
Claim 25
Dependent Claim
27 words
The system recited in claim 20 further comprising a throttle coupled to the intake side of the engine downstream of the compressor and downstream of the intercooler.
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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) | 2007-11-23 | 2008-05-24 | 2008-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-11-23 | 2012-05-24 | 2012-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-11-23 | 2016-05-24 | 2016-11-23 | $7700.00 | Window Closed / Lapsed |