EP1020633A1 - One way valve for exhaust gas recirculation - Google Patents

One way valve for exhaust gas recirculation Download PDF

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Publication number
EP1020633A1
EP1020633A1 EP99112494A EP99112494A EP1020633A1 EP 1020633 A1 EP1020633 A1 EP 1020633A1 EP 99112494 A EP99112494 A EP 99112494A EP 99112494 A EP99112494 A EP 99112494A EP 1020633 A1 EP1020633 A1 EP 1020633A1
Authority
EP
European Patent Office
Prior art keywords
stop
cam
check valve
exhaust gas
sealing element
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Withdrawn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
EP99112494A
Other languages
German (de)
French (fr)
Inventor
Heribert Dipl.-Ing(FH) Möller
Roland Dipl.-Ing. Von Hoerner
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.)
MAN Truck and Bus SE
Original Assignee
MAN Nutzfahrzeuge AG
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
Priority claimed from DE19830230A external-priority patent/DE19830230C2/en
Application filed by MAN Nutzfahrzeuge AG filed Critical MAN Nutzfahrzeuge AG
Publication of EP1020633A1 publication Critical patent/EP1020633A1/en
Withdrawn legal-status Critical Current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
    • 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
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/59—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor
    • 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 invention has for its object the structural effort for a regulated Exhaust gas recirculation and a shutdown of the exhaust gas recirculation in engine braking mode to keep it as low as possible.
  • the axial displaceability of the stop for the sealing element makes it possible to to vary the effective valve cross-section so that the recirculation rates for the exhaust gas can be regulated.
  • the sealing element can also function as a barrier take over with engine braking operation. Since the check valve according to the invention is multifunctional, considerable savings are made in construction costs and volume.
  • An advantageous embodiment of the movable stop can claim 3 be removed.
  • the stop can be moved axially by the cam and allows the control of the valve cross-section up to the complete shut-off.
  • valve cross section Another advantageous possibility for regulating the valve cross section can be Remove claim 4. Because the sealing element is designed as an elastic tongue or plate which is regulated directly by the cam becomes an inexpensive solution reached.
  • FIG. 1 shows in section I-I an inventive check valve for exhaust gas recirculation.
  • the check valve consists essentially of the valve body 1 with openings 2, a sealing element 3, a spring plate 4 and a stop 5.
  • the stop 5 is axially displaceable along a spindle 9, so that the movement of the sealing element 3 can be limited.
  • the stop 5 against the restoring force of a coil spring 6 by cooperation with an actuating element 7 in the form of a cam 8 moves.
  • the rotation of the cam 8 can in a not shown here Way by a crank and a cylinder connected non-rotatably to the cam 8 be accomplished.
  • FIG. 2 shows a top view of the valve body 1 with openings 2.
  • the check valve according to the invention is multifunctional.
  • valve In the uppermost position of the stop 5, the valve is in the closed position by the Sealing element 3 completely closes the openings 2.
  • the valve thus fulfills the Function of a throttle in engine braking mode.
  • the stop 5 will be down moves so that the sealing element can open a predetermined stroke H.
  • the valve also fulfills the function of regulated exhaust gas recirculation.
  • FIG. 3 A further advantageous embodiment of the check valve can be seen in FIG. 3.
  • the sealing element 3 is designed here as a plate or tongue, which in is elastic and always on the cam 8 without pressurization by charge air is present.
  • the plate or tongue can be reinforced with a plate 11 be provided.
  • the direction of flow of the exhaust gas is indicated by an arrow indicated. If there are pressure peaks in the exhaust gas, this is opened by the charge air pressure sealing element 3 held in the closed position until it strikes the cam 8 and leads part of the exhaust gas back into the charge air line 10.
  • the hub can be controlled by the cam 8. If necessary, the sealing element 3 can be completely be brought into the closed position so that a special shut-off valve is not required can.

Abstract

The check valve is so amplified by a movable stop (5) and a controllable operating component (7), that it also functions as a cut-off valve. The operating component is formed as a cam (8), which acts on the stop. The cam is operated by a crank and cylinder. The stop is pot-shaped and is movable along a central spindle. A screw spring (6) sets back the stop.

Description

Zur Rückführung von Abgas bei Dieselmotoren ist es bekannt, Flatterventile vorzusehen, welche die Eigenschaften besitzen bei Druckspitzen im Abgassystem einen Teil des Abgases in das Ansaugsystem zurückzuführen. Zur Steuerung der Rückführrate und zur Abschaltung der Abgasrückführung bei Motor-Bremsbetrieb ist ein zweites in Reihe geschaltetes Ventil erforderlich. Die Reihenschaltung zweier Ventile erfordert einen kostspieligen baulichen Aufwand und ein entsprechendes Bauvolumen. ( DE 195 21 573 A1)To recycle exhaust gas in diesel engines, it is known to provide flap valves, which have the properties at pressure peaks in the exhaust system of the exhaust gas back into the intake system. To control the return rate and to switch off the exhaust gas recirculation during engine braking is a second in Series connected valve required. The series connection of two valves requires an expensive construction effort and a corresponding construction volume. (DE 195 21 573 A1)

Der Erfindung liegt die Aufgabe zugrunde, den baulichen Aufwand für eine geregelte Abgasrückführung und eine Abschaltung der Abgasrückführung im Motor-Bremsbetrieb so gering als möglich zu halten.The invention has for its object the structural effort for a regulated Exhaust gas recirculation and a shutdown of the exhaust gas recirculation in engine braking mode to keep it as low as possible.

Erfindungsgemäß wird diese Aufgabe entsprechend den kennzeichnenden Merkmalen des Patentanspruches 1 gelöst.According to the invention, this object is in accordance with the characteristic features of claim 1 solved.

Durch die axiale Verschiebbarkeit des Anschlages für das Dichtelement ist es möglich, den wirksamen Ventilquerschnitt so zu variieren, daß die Rückführraten für das Abgas geregelt werden kann. Das Dichtelement kann darüber hinaus die Funktion einer Absperrung bei Motor-Bremsbetrieb übernehmen. Da das erfindungsgemäße Rückschlagventil multifunktionell ist, wird erheblich an Baukosten und Bauvolumen gespart.The axial displaceability of the stop for the sealing element makes it possible to to vary the effective valve cross-section so that the recirculation rates for the exhaust gas can be regulated. The sealing element can also function as a barrier take over with engine braking operation. Since the check valve according to the invention is multifunctional, considerable savings are made in construction costs and volume.

Eine vorteilhafte Weiterbildung des Betätigungselements kann Anspruch 2 entnommen werden. Durch den Nocken läßt sich der wirksame Ventilquerschnitt mit minimalem baulichen Aufwand regeln.An advantageous further development of the actuating element can be found in claim 2 become. The effective valve cross-section can be minimized with the cam regulate construction effort.

Eine vorteilhafte Ausgestaltung des beweglichen Anschlages kann Anspruch 3 entnommen werden. Der Anschlag läßt sich durch den Nocken axial verschieben und gestattet die Regelung des Ventilquerschnittes bis hin zur völligen Absperrung.An advantageous embodiment of the movable stop can claim 3 be removed. The stop can be moved axially by the cam and allows the control of the valve cross-section up to the complete shut-off.

Eine weitere vorteilhafte Möglichkeit zur Regelung des Ventilquerschnitts läßt sich Anspruch 4 entnehmen. Da das Dichtelement als elastische Zunge oder Platte ausgeführt ist welche unmittelbar durch den Nocken geregelt ist wird eine kostengüstige Lösung erreicht.Another advantageous possibility for regulating the valve cross section can be Remove claim 4. Because the sealing element is designed as an elastic tongue or plate which is regulated directly by the cam becomes an inexpensive solution reached.

Ausführungsbeispiele eines erfindungsgemäßen Rückschlagventils sind an Hand von Zeichnungen dargestellt. Es zeigt:

Fig. 1
einen Schnitt I-I durch ein Rückschlagventil mit topfförmigem Anschlag
Fig. 2
eine Draufsicht auf einen Ventilkörper des Rückschlagventils
Fig. 3
einen Längsschnitt durch ein Rückschlagventil mit elastischer Zunge und Nocken zur Regelung
Exemplary embodiments of a check valve according to the invention are illustrated with the aid of drawings. It shows:
Fig. 1
a section II through a check valve with a pot-shaped stop
Fig. 2
a plan view of a valve body of the check valve
Fig. 3
a longitudinal section through a check valve with elastic tongue and cam for control

Figur 1 zeigt im Schnitt I-I ein erfindungsgemäßes Rückschlagventil für eine Abgasrückführung. Das Rückschlagventil besteht im wesentlichen aus dem Ventilkörper 1 mit Öffnungen 2, einem Dichtelement 3, einem Federteller 4 und einem Anschlag 5. Erfindungsgemäß ist der Anschlag 5 axial längs einer Spindel 9 verschiebbar, so daß die Bewegung des Dichtelements 3 begrenzt werden kann. Im dargestellten Ausführungsbeispiel wird der Anschlag 5 gegen die rückstellende Kraft einer Schraubenfeder 6 durch das Zusammenwirken mit einem Betätigungselement 7 in Form eines Nockens 8 bewegt. Die Drehung des Nockens 8 kann in einer hier nicht näher dargestellten Weise durch eine mit dem Nocken 8 drehfest verbundene Kurbel und einen Zylinder bewerkstelligt werden.Figure 1 shows in section I-I an inventive check valve for exhaust gas recirculation. The check valve consists essentially of the valve body 1 with openings 2, a sealing element 3, a spring plate 4 and a stop 5. According to the stop 5 is axially displaceable along a spindle 9, so that the movement of the sealing element 3 can be limited. In the illustrated embodiment the stop 5 against the restoring force of a coil spring 6 by cooperation with an actuating element 7 in the form of a cam 8 moves. The rotation of the cam 8 can in a not shown here Way by a crank and a cylinder connected non-rotatably to the cam 8 be accomplished.

Figur 2 zeigt in Draufsicht den Ventilkörper 1 mit Öffnungen 2. FIG. 2 shows a top view of the valve body 1 with openings 2.

Das erfindungsgemäße Rückschlagventil ist multifunktionell einsetzbar.The check valve according to the invention is multifunctional.

Bei oberster Stellung des Anschlages 5 ist das Ventil in Schließstellung, indem das Dichtelement 3 die Öffnungen 2 gänzlich verschließt. Das Ventil erfüllt damit die Funktion einer Drossel bei Motor-Bremsbetrieb.In the uppermost position of the stop 5, the valve is in the closed position by the Sealing element 3 completely closes the openings 2. The valve thus fulfills the Function of a throttle in engine braking mode.

Soll nun ein Teil des Abgases rückgeführt werden, so wird der Anschlag 5 nach unten bewegt, so daß das Dichtelement um einen vorgegebenen Hub H öffnen kann. (Fig. 1) Das Ventil erfüllt also auch die Funktion einer geregelten Abgasrückführung.If part of the exhaust gas is now to be returned, the stop 5 will be down moves so that the sealing element can open a predetermined stroke H. (Fig. 1) The valve also fulfills the function of regulated exhaust gas recirculation.

Eine weitere vorteilhafte Ausgestaltung des Rückschlagventils ist der Figur 3 entnehmbar. Das Dichtelement 3 ist hier als eine Platte oder Zunge ausgebildet, die in sich elastisch ist und die ohne Druckbeaufschlagung durch Ladeluft stets am Nocken 8 anliegt. Zur Erhöhung der Festigkeit kann die Platte oder Zunge mit einer Verstärkungsplatte 11 versehen sein. Die Strömungsrichtung des Abgases ist durch einen Pfeil angedeutet. Bei auftretenden Druckspitzen des Abgases öffnet das durch den Ladeluftdruck in Schließstellung gehaltene Dichtelement 3 bis es gegen den Nocken 8 schlägt und führt einen Teil des Abgases in die Ladeluftleitung 10 zurück. Der Hub kann durch den Nocken 8 gesteuert werden. Bei Bedarf kann das Dichtelement 3 vollkommen in Schließstellung gebracht werden, so daß ein besonderes Absperrventil entfallen kann.A further advantageous embodiment of the check valve can be seen in FIG. 3. The sealing element 3 is designed here as a plate or tongue, which in is elastic and always on the cam 8 without pressurization by charge air is present. To increase strength, the plate or tongue can be reinforced with a plate 11 be provided. The direction of flow of the exhaust gas is indicated by an arrow indicated. If there are pressure peaks in the exhaust gas, this is opened by the charge air pressure sealing element 3 held in the closed position until it strikes the cam 8 and leads part of the exhaust gas back into the charge air line 10. The hub can can be controlled by the cam 8. If necessary, the sealing element 3 can be completely be brought into the closed position so that a special shut-off valve is not required can.

Durch die erfindungsgemäße Ausführung des Rückschlagventils werden zwei komplette, in Reihe geschaltete Ventile durch ein einziges Ventil ersetzt. Neben Kosten wird auch viel an Bauraum eingespart.Due to the inventive design of the check valve, two complete, valves connected in series replaced by a single valve. In addition to costs a lot of space is also saved.

Ferner wird eine wesentliche Verbesserung der Strömungsverhältnisse erreicht, da nach dem Stand der Technik der Querschnitt der dem Rückschlagventil nachgeschalteten Drossel wesentlich kleiner ist. Eine derartige Verengung ist immer mit Druckverlusten verbunden. Durch die erfindungsgemäße bauliche Vereinigung der Funktionen wird dieser Druckverlust umgangen.Furthermore, a substantial improvement in the flow conditions is achieved because according to the prior art, the cross section of the check valve downstream Throttle is much smaller. Such a narrowing is always accompanied by pressure losses connected. By combining the functions according to the invention this pressure loss is avoided.

Claims (4)

Rückschlagventil für Abgasrückführung, bestehend aus Ventilkörper, Dichtelement, Federteller und Anschlag zur Begrenzung der Öffnung des Dichtelements, dadurch gekennzeichnet, daß das Rückschlagventil durch einen beweglichen Anschlag (5) und ein steuerbares Betätigungselement (7) derart ergänzt wird, daß es auch als Absperrventil fungiert.Check valve for exhaust gas recirculation, consisting of valve body, Sealing element, spring plate and stop to limit the opening of the sealing element, characterized in that the check valve by means of a movable stop (5) and a controllable actuating element (7) is supplemented such that it also functions as a shut-off valve. Rückschlagventil nach Anspruch 1, dadurch gekennzeichnet, daß das Betätigungselement 7 als ein Nocken 8 ausgebildet ist, welcher auf den Anschlag 5 einwirkt und daß der Nocken 8 beispielsweise durch Kurbel und Zylinder betätigt wird.Check valve according to claim 1, characterized in that the actuating element 7 is designed as a cam 8, which on the stop 5 acts and that the cam 8, for example by crank and cylinder is operated. Rückschlagventil nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß der Anschlag (5) topfförmig ausgebildet und längs einer zentral angeordneten Spindel (9) verschiebbar ist, und daß die Rückstellung des Anschlages 5 durch eine Schraubenfeder (6) erfolgt.Check valve according to claims 1 and 2, characterized in that that the stop (5) is cup-shaped and arranged along a centrally Spindle (9) is displaceable, and that the provision of the Stop 5 is done by a coil spring (6). Rückschlagventil nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß den Anschlag (5) das als Nocken (8) ausgebildete Betätigungselement (7) selbst bildet, und daß das Dichtelement (3) platten- oder zungenförmig ausgebildet ist, derart, daß das Dichtelement (3) infolge seiner Elastizität so vorgespannt ist, daß es ohne Druckeinwirkung der Ladeluft stets am Nocken (8) anliegt.Check valve according to claims 1 and 2, characterized in that that the stop (5) is designed as a cam (8) actuating element (7) forms itself, and that the sealing element (3) plate or tongue-shaped is designed such that the sealing element (3) as a result of its Elasticity is biased so that it is without pressure from the charge air always lies against the cam (8).
EP99112494A 1998-07-07 1999-07-01 One way valve for exhaust gas recirculation Withdrawn EP1020633A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19830230A DE19830230C2 (en) 1998-04-11 1998-07-07 Check valve for exhaust gas recirculation
DE19830230 1998-07-07

Publications (1)

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EP1020633A1 true EP1020633A1 (en) 2000-07-19

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10030287A1 (en) * 2000-06-20 2002-01-03 Mann & Hummel Filter System for sucking in air for an internal combustion engine includes single air intake channels leading to each internal combustion cylinder and a combustion gas return channel feeding into each air intake channel
WO2002064965A1 (en) * 2000-12-22 2002-08-22 A. Kayser Automotive System Gmbh Exhaust-gas recirculation valve comprising a pivotally mounted pressure control plate
EP1245820A1 (en) * 2001-03-29 2002-10-02 Siebe Automotive (Deutschland) GmbH Exhaust gas recirculation valve
DE10226020A1 (en) * 2002-06-12 2004-01-08 Man Nutzfahrzeuge Ag Detecting exhaust gas feedback rate involves e.g. digital evaluation of periodic duration for opening or closing by elastic plate whose position is detected by closing and/or opening electric circuit
WO2006116958A1 (en) 2005-04-29 2006-11-09 Mahle International Gmbh Internal combustion engine having exhaust gas recirculation
DE102006028146A1 (en) * 2006-06-16 2007-12-20 Mahle International Gmbh Exhaust gas recirculation device for an internal combustion engine and associated operating method
EP1876348A1 (en) * 2006-07-06 2008-01-09 Cooper-Standard Automotive (Deutschland) GmbH Exhaust gas recirculation valve
CN109026257A (en) * 2018-09-18 2018-12-18 江苏心源航空科技有限公司 A kind of variable lift reed valve device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1650383A1 (en) * 1967-07-26 1970-10-22 Gerdts Gustav F Kg Check valve
US3844260A (en) * 1972-11-01 1974-10-29 Stp Corp Exhaust gas recirculating valve
US4222356A (en) * 1978-09-13 1980-09-16 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas recirculation for a diesel engine
DE19521573A1 (en) 1995-06-14 1996-12-19 Man Nutzfahrzeuge Ag Exhaust gas return feed for turbocharged IC engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1650383A1 (en) * 1967-07-26 1970-10-22 Gerdts Gustav F Kg Check valve
US3844260A (en) * 1972-11-01 1974-10-29 Stp Corp Exhaust gas recirculating valve
US4222356A (en) * 1978-09-13 1980-09-16 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas recirculation for a diesel engine
DE19521573A1 (en) 1995-06-14 1996-12-19 Man Nutzfahrzeuge Ag Exhaust gas return feed for turbocharged IC engine
US5682746A (en) * 1995-06-14 1997-11-04 Man Nutzfahrzeuge Aktiengesellschaft Exhaust gas return system for a turbo-charged internal combustion engine

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10030287A1 (en) * 2000-06-20 2002-01-03 Mann & Hummel Filter System for sucking in air for an internal combustion engine includes single air intake channels leading to each internal combustion cylinder and a combustion gas return channel feeding into each air intake channel
WO2002064965A1 (en) * 2000-12-22 2002-08-22 A. Kayser Automotive System Gmbh Exhaust-gas recirculation valve comprising a pivotally mounted pressure control plate
EP1245820A1 (en) * 2001-03-29 2002-10-02 Siebe Automotive (Deutschland) GmbH Exhaust gas recirculation valve
DE10226020A1 (en) * 2002-06-12 2004-01-08 Man Nutzfahrzeuge Ag Detecting exhaust gas feedback rate involves e.g. digital evaluation of periodic duration for opening or closing by elastic plate whose position is detected by closing and/or opening electric circuit
DE10226020B4 (en) * 2002-06-12 2005-07-21 Man Nutzfahrzeuge Ag Method for determining the exhaust gas recirculation rate of an exhaust gas recirculation valve
US7895993B2 (en) 2005-04-29 2011-03-01 Mahle International Gmbh Internal combustion engine having exhaust gas recirculation
WO2006116958A1 (en) 2005-04-29 2006-11-09 Mahle International Gmbh Internal combustion engine having exhaust gas recirculation
DE102006028146A1 (en) * 2006-06-16 2007-12-20 Mahle International Gmbh Exhaust gas recirculation device for an internal combustion engine and associated operating method
US7591256B2 (en) 2006-06-16 2009-09-22 Mahle International Gmbh Exhaust gas recirculation apparatus for an internal combustion engine and the respective operating method
US7533659B2 (en) 2006-07-06 2009-05-19 Cooper-Standard Automotive (Deutchland) Gmbh Exhaust-gas recirculation valve
EP1876348A1 (en) * 2006-07-06 2008-01-09 Cooper-Standard Automotive (Deutschland) GmbH Exhaust gas recirculation valve
CN101105161B (en) * 2006-07-06 2012-05-23 库帕-标准汽车（德国）有限责任公司 Exhaust gas recirculation valve
CN109026257A (en) * 2018-09-18 2018-12-18 江苏心源航空科技有限公司 A kind of variable lift reed valve device

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