US20070261394A1 - Fluid extraction arrangement for engine air induction system - Google Patents
Fluid extraction arrangement for engine air induction system Download PDFInfo
- Publication number
- US20070261394A1 US20070261394A1 US11/432,098 US43209806A US2007261394A1 US 20070261394 A1 US20070261394 A1 US 20070261394A1 US 43209806 A US43209806 A US 43209806A US 2007261394 A1 US2007261394 A1 US 2007261394A1
- Authority
- US
- United States
- Prior art keywords
- conduit
- air
- holes
- internal combustion
- combustion engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/30—Arrangements for supply of additional air
- F01N3/32—Arrangements for supply of additional air using air pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
- F02M35/10144—Connections of intake ducts to each other or to another device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10373—Sensors for intake systems
- F02M35/10386—Sensors for intake systems for flow rate
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
Description
- This invention relates to internal combustion engines having a secondary air injection system that extracts air from an air induction system at multiple extraction points to reduce the effect of air extraction in the induction system.
- Secondary air injection (SAI) systems are used with internal combustion engines to promote oxidation of unburned hydrocarbons and reduce catalytic converter light-off time in the period immediately following engine cold start. SAI systems introduce air extracted from the engine's air induction system to the engine's exhaust system downstream of the exhaust valves, where the air mixes with unburned hydrocarbons in the exhaust and promotes hydrocarbon and carbon monoxide oxidation.
- Most prior art SAI systems extract the air they feed into the exhaust system from an extraction point located between the air filter and mass air flow sensor in the air induction system. Since SAI systems generally operate when engine loads are relatively light, the air flow rate through the SAI system can far exceed that which passes through the throttle body and into the engine's intake manifold. Under these conditions, air extraction by the SAI system distorts the air flow velocity field passing through the mass air flow (MAF) sensor located farther downstream from the SAI extraction point. This distortion may introduce uncertainty in the mass air flow rate the MAF sensor determines is entering the engine. Prior art air induction systems may use a software-based correction in the engine calibration to compensate for the influence of SAI system air extraction on the signal produced by the MAF sensor.
- An internal combustion engine includes an air induction system having a manifold and a conduit. The conduit defines an air passageway that is in fluid communication with the manifold. The passageway is configured to convey air from the atmosphere to the manifold, which then distributes the air to a plurality of engine cylinders. An exhaust system has a manifold configured to selectively convey exhaust gas from the cylinders. A secondary air injection system is configured to convey air from the induction system to the exhaust system.
- The secondary air injection system is in fluid communication with the conduit through multiple holes formed therein, and is configured to extract air through the multiple holes and inject the air into the exhaust system. The use of multiple holes to extract air from the conduit reduces the influence of the SAI system on mass air flow sensors by minimizing the effect of SAI air extraction on the air flow velocity field inside the induction system. As a result, the uncertainty in MAF sensor readings may be significantly lower than in prior art systems that use a single SAI extraction hole. The use of multiple extraction holes also helps to reduce turbulence levels in the air induction system.
- In an exemplary embodiment, the multiple holes are evenly spaced around the circumference of the conduit. A fitting concentrically surrounds the conduit and cooperates with the conduit to define an annular chamber. The annular chamber is in fluid communication with the conduit passageway through the multiple holes.
- The above features and advantages, and other features and advantages, of the present invention are readily apparent from the following detailed description of the best modes for carrying out the invention when taken in connection with the accompanying drawings.
-
FIG. 1 is a schematic illustration of an internal combustion engine with a secondary air injection system configured to extract air from an air intake conduit and inject the air into an exhaust system; and -
FIG. 2 is a schematic, cross-sectional view of a coupling between the secondary air injection system and the air intake conduit. - Referring to
FIG. 1 , aninternal combustion engine 12 includes anair induction system 16. Theair induction system 16 includes anair filter 20 through whichair 22 is drawn from the atmosphere and filtered as understood by those skilled in the art. Aconduit 24, such as a hose or pipe, defines a passageway (shown at 26 inFIG. 2 ) that conveys air from theair filter 20 to an intake manifold and plenum 28 for distribution among theengine cylinders 30. A throttle valve (not shown) regulates the amount of air flowing into the manifold and plenum 28. - A mass
air flow sensor 32 is operatively connected to theconduit 24 to monitor the mass air flow rate through theconduit 24. The massair flow sensor 32 transmits signals indicative of the mass air flow rate to an engine control module (not shown). The engine control module uses the data from the massair flow sensor 32 in the control and monitoring of various engine operating characteristics, as understood by those skilled in the art. - The
engine 12 also includes a secondaryair induction system 36. Theair induction system 36 includes a secondaryair injection pump 40 that draws air fromconduit 24 intoconduit 44 through acoupling 48. Air fromconduit 44 is then conveyed throughconduit 52 and into the engine'sexhaust system 58. Theexhaust system 58 includes amanifold 60 withrunners 62, which are in fluid communication with the exhaust ports (not shown) of thecylinders 30. Theexhaust manifold 60 conveys exhaust gas from the exhaust ports to acatalytic converter 64. The secondaryair injection system 36 includes solenoid-operated valves (not shown) to selectively prevent air from flowing from theair induction system 16 into theexhaust manifold 60. - The location in the exhaust system where the secondary
air injection system 36 injects air is shown schematically. Those skilled in the art will recognize that it may be desirable for the secondaryair injection system 36 to inject air as far upstream in the exhaust system as possible so that the exhaust gas that mixes with secondary air has a sufficiently high temperature. In the context of the claimed invention, the exhaust system includes all conduits downstream of exhaust valves, including exhaust ports (not shown),runners 62, etc. Thus, for example, and within the scope of the claimed invention, a secondary air injection system that is configured to convey air into an exhaust system includes a secondary air injection system that is configured to inject air into exhaust ports formed in a cylinder head. - Referring to
FIG. 2 , wherein like reference numbers refer to like components fromFIG. 1 , theconduit 24 is characterized by a generally annular cross-section, and, accordingly, thepassageway 26 through which the air flows is characterized by a generally circular cross section. More specifically, theconduit 24 defines aninner surface 66 that defines thepassageway 26, and anouter surface 68 opposite theinner surface 66. Theconduit 24 defines a plurality of apertures that extend from thepassageway 26 to the exterior of theconduit 24 and that are evenly spaced from one-another along the periphery of theconduit 24. More specifically, in the embodiment depicted, theconduit 24 defines four holes orapertures 72A-D that extend radially from thepassageway 26 to the exterior of theconduit 24. Since theconduit 24 has an annular cross section, theapertures 72A-D are evenly-spaced circumferentially with respect to the conduit. - Although the embodiment depicted includes four
apertures 72A-D, more or fewer apertures may be employed within the scope of the claimed invention. For example, two apertures that are evenly-spaced circumferentially, i.e., that are 180 degrees apart, may be employed. Similarly, three apertures that are evenly spaced circumferentially, i.e., that are 120 degrees apart, may be employed. - The
coupling 48 has a generally annular cross section, and concentrically surrounds theconduit 24. Theinner surface 76 of thecoupling 48 and theouter surface 68 of theconduit 24 cooperate to define a ring-shaped chamber orpassageway 78 that is in fluid communication with thepassageway 26 viaapertures 72A-D, and that is in fluid communication withconduit 44. In the embodiment depicted, thesurfaces - Air from the
passageway 26 defined byconduit 24 can enter the chamber orpassageway 78 defined by thecoupling 48 throughapertures 72A-D. The air then flows from thepassageway 78 to theconduit 44, and through the remainder of the secondaryair injection system 36 into theexhaust manifold 60. Thechamber 78 is sealed at the axial ends of thecoupling 48 to prevent air from leaving thechamber 78 except throughconduit 44. - Since air is extracted through multiple holes, especially through multiple holes that are evenly spaced circumferentially around the
conduit 24, the effects of air extraction from the conduit are distributed throughout the conduit cross-section, thereby reducing or eliminating air velocity gradients and turbulence levels within the induction system that may be caused by air extraction from a single hole. - While the best mode for carrying out the invention has been described in detail, those familiar with the art to which this invention relates will recognize various alternative designs and embodiments for practicing the invention within the scope of the appended claims.
Claims (9)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/432,098 US20070261394A1 (en) | 2006-05-11 | 2006-05-11 | Fluid extraction arrangement for engine air induction system |
DE102007021540A DE102007021540A1 (en) | 2006-05-11 | 2007-05-08 | Fluid take-off assembly for a machine air suction system |
CNA2007101032531A CN101070772A (en) | 2006-05-11 | 2007-05-10 | Fluid extraction arrangement for engine air induction system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/432,098 US20070261394A1 (en) | 2006-05-11 | 2006-05-11 | Fluid extraction arrangement for engine air induction system |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070261394A1 true US20070261394A1 (en) | 2007-11-15 |
Family
ID=38608281
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/432,098 Abandoned US20070261394A1 (en) | 2006-05-11 | 2006-05-11 | Fluid extraction arrangement for engine air induction system |
Country Status (3)
Country | Link |
---|---|
US (1) | US20070261394A1 (en) |
CN (1) | CN101070772A (en) |
DE (1) | DE102007021540A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104968925A (en) * | 2013-02-13 | 2015-10-07 | 大众汽车有限公司 | Internal combustion engine comprising a booster |
US11927159B1 (en) * | 2023-01-18 | 2024-03-12 | Ford Global Technologies, Llc | Secondary air path for an air induction system |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4134263A (en) * | 1977-03-25 | 1979-01-16 | Toyota Jidosha Kogyo Kabushiki Kaisha | Air cleaner for use in an internal combustion engine |
US4165611A (en) * | 1976-11-26 | 1979-08-28 | Toyota Jidosha Kogyo Kabushiki Kaisha | Secondary air feeding device for an internal combustion engine |
US4334263A (en) * | 1979-03-13 | 1982-06-08 | Pioneer Electronic Corporation | Separately excited DC-DC converter having feedback circuit with temperature compensating effect |
US4450680A (en) * | 1980-08-12 | 1984-05-29 | Honda Giken Kogyo Kabushiki Kaisha | Air/fuel ratio control system for internal combustion engines, having secondary air supply control |
US5279155A (en) * | 1993-02-04 | 1994-01-18 | Honeywell, Inc. | Mass airflow sensor |
US20040168432A1 (en) * | 2002-12-07 | 2004-09-02 | Mann & Hummel Gmbh | Method and apparatus for controlling a secondary air stream in an internal combustion engine |
-
2006
- 2006-05-11 US US11/432,098 patent/US20070261394A1/en not_active Abandoned
-
2007
- 2007-05-08 DE DE102007021540A patent/DE102007021540A1/en not_active Withdrawn
- 2007-05-10 CN CNA2007101032531A patent/CN101070772A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4165611A (en) * | 1976-11-26 | 1979-08-28 | Toyota Jidosha Kogyo Kabushiki Kaisha | Secondary air feeding device for an internal combustion engine |
US4134263A (en) * | 1977-03-25 | 1979-01-16 | Toyota Jidosha Kogyo Kabushiki Kaisha | Air cleaner for use in an internal combustion engine |
US4334263A (en) * | 1979-03-13 | 1982-06-08 | Pioneer Electronic Corporation | Separately excited DC-DC converter having feedback circuit with temperature compensating effect |
US4450680A (en) * | 1980-08-12 | 1984-05-29 | Honda Giken Kogyo Kabushiki Kaisha | Air/fuel ratio control system for internal combustion engines, having secondary air supply control |
US5279155A (en) * | 1993-02-04 | 1994-01-18 | Honeywell, Inc. | Mass airflow sensor |
US20040168432A1 (en) * | 2002-12-07 | 2004-09-02 | Mann & Hummel Gmbh | Method and apparatus for controlling a secondary air stream in an internal combustion engine |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104968925A (en) * | 2013-02-13 | 2015-10-07 | 大众汽车有限公司 | Internal combustion engine comprising a booster |
US9631551B2 (en) | 2013-02-13 | 2017-04-25 | Volkswagen Aktiengesellschaft | Internal combustion engine including a booster |
US11927159B1 (en) * | 2023-01-18 | 2024-03-12 | Ford Global Technologies, Llc | Secondary air path for an air induction system |
Also Published As
Publication number | Publication date |
---|---|
DE102007021540A1 (en) | 2007-11-22 |
CN101070772A (en) | 2007-11-14 |
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Owner name: GM GLOBAL TECHNOLOGY OPERATIONS, INC, MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MANDRUSIAK, GARY D.;REEL/FRAME:017828/0125 Effective date: 20060331 |
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