EP2631454A1 - Drosselventil für Verbrennungsmotoren - Google Patents

Drosselventil für Verbrennungsmotoren Download PDF

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Publication number
EP2631454A1
EP2631454A1 EP12157157.4A EP12157157A EP2631454A1 EP 2631454 A1 EP2631454 A1 EP 2631454A1 EP 12157157 A EP12157157 A EP 12157157A EP 2631454 A1 EP2631454 A1 EP 2631454A1
Authority
EP
European Patent Office
Prior art keywords
throttle
exhaust gas
throttle shaft
pressure
throttle valve
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.)
Withdrawn
Application number
EP12157157.4A
Other languages
English (en)
French (fr)
Inventor
Bilal Bakindi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caterpillar Motoren GmbH and Co KG
Original Assignee
Caterpillar Motoren GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Caterpillar Motoren GmbH and Co KG filed Critical Caterpillar Motoren GmbH and Co KG
Priority to EP12157157.4A priority Critical patent/EP2631454A1/de
Publication of EP2631454A1 publication Critical patent/EP2631454A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/66—Lift valves, e.g. poppet valves
    • F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/70—Flap valves; Rotary valves; Sliding valves; Resilient valves

Definitions

  • the present disclosure generally refers to throttle valves and methods for operating throttle valves of internal combustion engines and more particularly to rinsing of throttle shaft bearings disposed within the throttle valve with high-pressure gas.
  • Throttle valves may be employed as "ON/OFF" valves which means that, for instance, a gas flow through the throttle valve may be controlled. In an “ON” state, the gas flow may pass the throttle valve, whereas in an “OFF” state, the gas flow may be prevented from flowing through the throttle valve. Furthermore, throttle valves may also smoothly adjust the amount of gas flow through the gas flow control valve.
  • the present disclosure is directed, at least in part, to improving or overcoming one or more aspects of prior systems.
  • a throttle valve for controlling an exhaust gas flow within an internal combustion engine.
  • the throttle valve may comprise a valve body providing a main gas path.
  • the throttle valve may further include a throttle shaft bearing integrated in the valve body, a pivotable throttle shaft mounted to the valve body via the throttle shaft bearing, and a throttle plate mounted to the throttle shaft and being pivotable within the main gas path by pivoting the throttle shaft.
  • a channel system within the valve body may be configured to provide a high-pressure gas flowing along the throttle shaft into the main gas path.
  • an exhaust gas system may comprise a first exhaust gas flow path and at least one exhaust gas treatment device disposed within the first exhaust gas flow path for treating exhaust gas of an internal combustion engine.
  • the exhaust gas system may further comprise a second exhaust gas flow path fluidly connected to the first exhaust gas flow path, and at least one throttle valve as described above, wherein the throttle valve being disposed within the first or second exhaust gas flow path.
  • an internal combustion engine may comprise at least one throttle valve according to the present disclosure.
  • a method for operating a throttle valve may comprise a throttle body and a throttle shaft bearing configured to support a throttle shaft and disposed within a recessed portion of the valve body.
  • the method for operating the throttle valve may comprise routing a gas flow through the main gas path, and rinsing the recessed portion with high-pressure gas.
  • the throttle valve may further comprise a recessed portion delimited by the throttle shaft bearing and extending around the throttle shaft into which the channel system opens.
  • the channel system may comprise a high-pressure port for connecting to a high-pressure gas source or the charge air system of an internal combustion engine.
  • the channel system may further comprise an opening being in fluid communication with the recessed portion and with the pressure port via the channel system.
  • the opening may be positioned between the throttle shaft bearing and the main gas path.
  • the present disclosure may be based in part on the realization that rinsing of throttle shaft bearings of throttle valves may prevent a throttle shaft from being affected, for example, blocked by deposits originating from the exhaust gas.
  • FIG. 1 an exemplary schematic diagram of an internal combustion engine 10 including an engine unit 20 and an exhaust gas system 30 is shown.
  • the engine unit 20 may comprise a cylinder block 22 providing multiple cylinders 24, an intake manifold 26 providing a mixture of charge air to the cylinders 24 into which a liquid fuel may be injected. After combustion of the air/fuel mixture, the exhaust gas may be released into an exhaust manifold 28 of the exhaust gas system 30.
  • the internal combustion engine 10 may comprise a two-stage turbocharger.
  • the exhaust gas system 30 may comprise a high-pressure turbo stage 29H fluidly connected to and disposed downstream of the exhaust manifold 28.
  • the high-pressure turbo stage may be configured to drive a compressor to compress charge air prior charging the cylinders 24.
  • the engine unit 20 may further comprise a low-pressure turbo stage 29L being disposed downstream of the exhaust gas system 30.
  • the exhaust gas system 30 may comprise an exhaust gas treatment device 32, such as a SCR-unit, for treating the exhaust gas prior its release into the environment.
  • the exhaust gas treatment device 32 may be disposed within a first exhaust gas path 34 fluidly connected in between the high-pressure turbo stage 29H and, for instance, the low-pressure turbo stage 29L.
  • the exhaust gas system 30 may comprise a second exhaust gas path 36 being arranged in parallel to the first exhaust gas path 34.
  • the second exhaust gas path 36 may be configured to bypass the exhaust gas treatment device 32.
  • the exhaust gas system 30 may comprise at least one throttle valve 38, 39 for either blocking or unblocking the first or second exhaust gas path 34, 36, respectively.
  • the throttle valves 38, 39 may prevent or may enable the exhaust gas from passing through.
  • the throttle valve 38 may be disposed upstream of the SCR-unit 32 within the first exhaust gas path 34, and the throttle valve 39 may be disposed within the second exhaust gas path 36.
  • the exhaust gas system 30 may further comprise an exhaust gas re-circulation (EGR) path 50 for re-circulating exhaust gas from the exhaust manifold 28 into the intake manifold 26. After combustion, the pressurized exhaust gas may be re-circulated and may mix with the compressed charge air within or prior the intake manifold 26.
  • EGR exhaust gas re-circulation
  • a throttle valve 52 may be disposed within the EGR path 50 for blocking or unblocking the EGR path 50.
  • a high-pressure gas pipe 44 may connect the throttle valves 38, 39, and 52 with the air pipe 27 for branching off a desired amount of pressurized gas, for example pressurized charge air.
  • a separate high-pressure gas source 42 may be provided for supplying the throttle valves 38, 39 with a high-pressure gas.
  • the throttle valve 38 may comprise a valve body 60 providing a main gas path 62, a throttle shaft 64 pivotable mounted to the valve body 60, and a throttle plate 66 mounted to the throttle shaft 64 and being pivotable within the main gas path 62 by pivoting the throttle shaft 64.
  • the throttle plate 66 may be mounted to the throttle shaft 64 by techniques known in the art, such as screwing and/or welding.
  • the main gas path 62 may have a cylindrical shape having an inner wall 63.
  • the main gas path 62 may be provided with a rectangular, conical or any other known geometrical shape.
  • the main gas path 62 may extend through the throttle valve 38, thereby enabling, for instance, exhaust gas to flow through the throttle valve 38.
  • the throttle valve 38 may further comprise a first flange 68 and a second flange 69 disposed on the opposite ends of a pipe section 67, which delimits the main gas path 62 through the throttle valve 38.
  • the first flange 68 and/or the second flange 69 may be configured to connect, for example, to the exhaust gas system 30.
  • the exhaust gas may pass through the throttle valve 38 along an exhaust gas flow direction indicated by an arrow E, i.e. from the left to the right in Fig. 2 .
  • the throttle plate 66 may be mounted to the throttle shaft 64 at a downstream side of the throttle shaft 64. When flowing through the pipe section 67, the exhaust gas may first pass the throttle shaft 64 and then the throttle plate 66.
  • the throttle plate 66 pivoted into a position blocking the main gas path 62 may prevent the exhaust gas to pass through the throttle valve 38.
  • the throttle plate 66 may further be pivoted within an angular range of about 75°, in some embodiments even into a position parallel to the exhaust gas flow direction, to enable the exhaust gas to pass through the throttle valve 3 8.
  • the throttle plate 66 may be pivoted in a controlled manner to throttle the exhaust gas flow through the throttle valve 38. Accordingly, the amount of exhaust gas passing through the throttle valve 38 may be smoothly adjusted.
  • a valve control unit (not shown) may be configured to pivot the throttle shaft 64 for controlling the amount of exhaust gas passing through the throttle valve.
  • Fig. 3 an exemplary schematic cut view of the throttle valve 38 in a direction along the exhaust gas flow direction indicated by the arrow E in Fig. 2 is shown.
  • the throttle valve 38 may comprise a mounting arrangement to pivotably mount the throttle shaft 64 to the valve body 60.
  • the throttle shaft 64 may be mounted on opposing sides of the valve body 60, whereby at least at one side the throttle shaft 64 may extend through the valve body 60, usually the driving end of the throttle shaft 64.
  • the mounting arrangement may include a throttle shaft bearing 72 positioned within a through hole through the valve body 60.
  • a recessed portion 74 may then be formed between the throttle shaft 64 and the wall of the through hole (e.g. surrounding the throttle shaft 64), whereby the recessed portion 74 may be delimited by the throttle shaft bearing 72 and open into the main gas path 62 within the valve body 60.
  • the recessed portion 74 may extend up to 50 % or more of the thickness of the wall of the valve body 60 and have a radial extension of several millimeters.
  • one or more sealing lips 95 may be configured to circumferentially contact the throttle shaft 64, thereby sealing the through hole from the outside of the valve body 60.
  • the through hole may be closed using a sealing arrangement 90 comprising, for example, a cover plate screwed to the valve body 60.
  • the throttle valve 38 may further comprise a channel system 70 within the valve body 60, specifically within the wall region of the valve body close to the bearing 72 and recessed portion 74.
  • the channel system 70 may be configured to guide pressurized gas such as air to the recessed portion 74, such that, during operation of the throttle valve 38, a steady stream of pressurized gas may flow along the throttle shaft 64 away from the throttle shaft bearing 72 into the main gas path 62.
  • the channel system 70 may extend within the wall of the valve body 60 and fluidly connect one or more openings accessible from the outside of the valve body 60 with one or more openings 76 opening into the recessed portion 74.
  • a channel of the channel system 70 may extend perpendicular to the throttle shaft 64 from the outside of the throttle valve 38 through the valve body 60 and open into the recessed portion 74 within a central area of the recessed portion 74 between the throttle shaft bearing 72 and the main inner wall 63 of the pipe section 67.
  • the channel system 70 may be fluidly connected to the high-pressure gas pipe 44 via a high-pressure port 80 integrated for example into the wall of the valve body 60.
  • the high-pressure port 80 may allow supplying the channel system 70with high-pressure gas.
  • the high-pressure port 80 may be a standardized air port known in the art.
  • the high-pressure gas may flow through the channel system 70 into the recessed portion 74 of the valve body 60 and along the throttle shaft 64 into the main gas path 62.
  • the channel system 70 may open into the recessed portion 74 via an opening 76.
  • the opening 76 may, therefore, fluidly connect the channel system 70 to the main gas path 62 via the recessed portion 74.
  • the opening 76 may be disposed between the main gas path 62 and the throttle shaft bearing 72.
  • the throttle shaft 64 may be supported by the throttle shaft bearing 72 disposed within the recessed portion 74 of the valve body 60.
  • the throttle shaft bearing 72 may be an anti-friction bearing known in the art, such as a ball-bearing or a roller-bearing.
  • the high-pressure gas may be introduced into the recessed portion 74 through the sealing arrangement 90. In such embodiments, the high-pressure gas may flow through the bearing into the main gas path 62.
  • the throttle shaft 64 may be supported in a similar manner by, for example, an anti-friction bearing 73. However, the throttle shaft 64 may extend out of the valve body 60 for connecting to the valve control unit (not shown).
  • the valve control unit may be configured to pivot the throttle shaft 64 with the throttle plate 66 for adjusting and throttling the exhaust gas flow through the main gas path 62.
  • the bearing 73 may be provided in the through hole such that a recessed portion 75 is formed.
  • a high-pressure port 81 and the high-pressure port 80 may be commonly fluidly connected via the high-pressure gas pipe 44 to a high-pressure gas source 42.
  • the high-pressure gas pipe 44 may comprise a port for connecting to the charge air system and/or the high-pressure gas source 42 such as the high-pressure start up air of a large internal combustion engine.
  • the high-pressure ports 80, 81 may be respectively connected to the charge air system or the high-pressure gas source 42.
  • the exhaust gas may be released into the exhaust manifold 28 and the exhaust gas system 30.
  • the exhaust gas treatment device 32 disposed within the first exhaust gas path 34 may be configured to treat the exhaust gas prior to releasing into the environment.
  • control unit may control the throttle valves 38, 39 to be in a blocking or unblocking state.
  • the unblocking state may be constituted by the throttle plate 66 being in a position parallel to the exhaust gas flow direction E whereas the blocking state may be constituted by the throttle plate 66 being in a position as shown in Fig. 2 , thereby preventing the exhaust gas from passing through the main gas path 62.
  • the exhaust gas may contain soot particles which may penetrate into the recessed portion 74 and, thus, affect the throttle shaft bearing 72 of the throttle shaft 64. Soot particles may deposit, for example, at the recessed portion 74 or the throttle shaft bearing 72 and, thus, may block the pivoting movement of the throttle shaft 64.
  • high-pressure gas may be introduced into the recessed portion 74 for forming a gas cushion within the recessed portion.
  • the high-pressure gas for example compressed charge air, may originate from the air pipe 27 and the high-pressure turbo stage 29H.
  • the high-pressure gas source 42 may provide high-pressure gas to the throttle valve 38 instead of branching off the compressed charge air from the air pipe 27.
  • the high-pressure gas may be introduced via the high-pressure port 80 into the channel system 70. Subsequently, after passing the channel system 70, the high-pressure gas may flow into the recessed portion 74 via the opening 76, thereby, the high-pressure gas may rinse the recessed portion 74. After rinsing the recessed portion 74, the high-pressure gas may flow along the throttle shaft 64 into the main gas path 62.
  • the high-pressure gas may be provided under a pressure higher than the pressure of the exhaust gas to prevent the exhaust gas from penetrating into the recessed portion 74 and, thereby, from polluting the recessed potion 74 and the throttle shaft bearing 72.
  • the high-pressure gas may form the gas cushion within the recessed portion 74 and may seal the throttle shaft bearing 72 from the main gas path 62.
  • the introduced compressed charge air may be available as soon as the engine in running.
  • the introduced high-pressure charge air may be provided, for example, with a pressure of 2.5 to 3 bar and with a flow rate of about 350 to 410 kg/h, which is about 0.6 percent of the total air flow within the internal combustion engine 10.
  • the throttle plate 66 may be mounted to the throttle shaft 64 at a downstream side of the throttle shaft 64.
  • the soot of the exhaust gas may also deposit at an interface between the throttle plate 66 and the inner wall 63, when the throttle plate 66 may be in the blocking position.
  • the high-pressure gas may also flow along this interface for preventing the above mentioned deposition of the soot.
  • the high-pressure gas may further improve closing of the main gas path 62 by the throttle plate 66.
  • the introduced high-pressure gas may cool the components, such as the valve body 60, the throttle shaft bearing 72, or the throttle shaft 64, and, therefore, may reduce wear of those components.
  • the disclosed throttle valve may be used at internal combustion engines or dual fuel internal combustion engines of middle to large size.
  • the internal combustion engine 10 may be sized and configured to be used e.g. in vessels, larger ships, or in power plants.
  • internal combustion engine as used herein is not specifically restricted and comprises any engine, in which the combustion of a fuel occurs with an oxidizer to produce high temperature and pressure gases, which are directly applied to a movable component of the engine, such as pistons or turbine blades, and move it over a distance thereby generating mechanical energy.
  • internal combustion engine comprises piston engines and turbines.
  • Medium speed internal combustion engines may be large stand-alone engines that therefore provide reasonable access to the end sides of the engine block.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lift Valve (AREA)
EP12157157.4A 2012-02-27 2012-02-27 Drosselventil für Verbrennungsmotoren Withdrawn EP2631454A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12157157.4A EP2631454A1 (de) 2012-02-27 2012-02-27 Drosselventil für Verbrennungsmotoren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12157157.4A EP2631454A1 (de) 2012-02-27 2012-02-27 Drosselventil für Verbrennungsmotoren

Publications (1)

Publication Number Publication Date
EP2631454A1 true EP2631454A1 (de) 2013-08-28

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EP12157157.4A Withdrawn EP2631454A1 (de) 2012-02-27 2012-02-27 Drosselventil für Verbrennungsmotoren

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EP (1) EP2631454A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0463921A (ja) * 1990-07-03 1992-02-28 Jidosha Kiki Co Ltd 排気ブレーキ装置
EP0885758A2 (de) * 1997-06-18 1998-12-23 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Verfahren zum Betrieb eines Wärmetauschers im Abgasstrom einer Brennkraftmaschine für Kraftfahrzeuge
US20040006977A1 (en) * 2002-07-12 2004-01-15 Toyota Jidosha Kabushiki Kaisha Exhaust emission control system of internal combustion engine
FR2912779A1 (fr) * 2007-02-15 2008-08-22 Faurecia Sys Echappement Ligne d'echappement de vehicule automobile comportant une vanne motorisee
EP1975387A1 (de) * 2007-03-22 2008-10-01 DEUTZ Power Systems GmbH Ventileinrichtung für eine Brennkraftmaschine mit einem Abgasturbolader
DE102010006023A1 (de) * 2010-01-27 2011-07-28 Pierburg GmbH, 41460 Dichtungsanordnung für eine Regelvorrichtung einer Verbrennungskraftmaschine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0463921A (ja) * 1990-07-03 1992-02-28 Jidosha Kiki Co Ltd 排気ブレーキ装置
EP0885758A2 (de) * 1997-06-18 1998-12-23 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Verfahren zum Betrieb eines Wärmetauschers im Abgasstrom einer Brennkraftmaschine für Kraftfahrzeuge
US20040006977A1 (en) * 2002-07-12 2004-01-15 Toyota Jidosha Kabushiki Kaisha Exhaust emission control system of internal combustion engine
FR2912779A1 (fr) * 2007-02-15 2008-08-22 Faurecia Sys Echappement Ligne d'echappement de vehicule automobile comportant une vanne motorisee
EP1975387A1 (de) * 2007-03-22 2008-10-01 DEUTZ Power Systems GmbH Ventileinrichtung für eine Brennkraftmaschine mit einem Abgasturbolader
DE102010006023A1 (de) * 2010-01-27 2011-07-28 Pierburg GmbH, 41460 Dichtungsanordnung für eine Regelvorrichtung einer Verbrennungskraftmaschine

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