EP1065365B1 - Exhaust gas recirculation valve - Google Patents

Exhaust gas recirculation valve Download PDF

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Publication number
EP1065365B1
EP1065365B1 EP00109770A EP00109770A EP1065365B1 EP 1065365 B1 EP1065365 B1 EP 1065365B1 EP 00109770 A EP00109770 A EP 00109770A EP 00109770 A EP00109770 A EP 00109770A EP 1065365 B1 EP1065365 B1 EP 1065365B1
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EP
European Patent Office
Prior art keywords
exhaust gas
gas recirculation
cylinder head
line
valve
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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.)
Expired - Lifetime
Application number
EP00109770A
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German (de)
French (fr)
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EP1065365A3 (en
EP1065365A2 (en
Inventor
Franz Bender
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Daimler AG
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DaimlerChrysler AG
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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
    • F02M26/65—Constructional details of EGR valves
    • F02M26/72—Housings
    • F02M26/73—Housings with means for heating or cooling the EGR valve
    • 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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/21—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system with EGR valves located at or near the connection to the intake system
    • 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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • 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
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • F02M26/54—Rotary actuators, e.g. step motors
    • 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

Definitions

  • the invention relates to an exhaust gas recirculation system for an internal combustion engine with a cylinder head associated Inlet and outlet piping of a cylinder head, the has a charge air line, which via an exhaust gas recirculation line and an exhaust gas recirculation valve is supplied to exhaust gas, wherein the exhaust gas recirculation valve, seen in the flow direction, after the cylinder head and in front of a separate exhaust gas supply is arranged, which is formed as a mixing device is.
  • JP-A-11082184 also shows an exhaust gas recirculation system, at the inside of an exhaust gas recirculation line a control valve is arranged.
  • the control valve is here provided in front of a charge air distributor.
  • the document D 3 (DE 197 25 668 C1) shows an exhaust gas recirculation device with two inlet openings for fresh air and Exhaust gas and two outlet openings for fresh air and exhaust gas, wherein the exhaust gas outlet opening is centered in the outlet opening is arranged for fresh air.
  • the invention task is the exhaust gas recirculation valve and form the exhaust gas supply device in such a way and arrange that a maintenance-free exhaust gas recirculation and an optimal exhaust gas temperature is ensured.
  • the object is achieved according to the invention characterized in that the exhaust gas recirculation valve directly behind the cylinder head in the area the cold side of the cylinder head of the internal combustion engine arranged is and to a built-in cylinder head part the exhaust gas recirculation line connects.
  • This is achieved that the temperature level of the exhaust gases in the integrated part of Exhaust pipe is sufficiently reduced and thus the materials Do not overstress the exhaust gas recirculation valve become.
  • the temperature level of the exhaust gases is still sufficiently high to cause the valve or valve seat to become lightly baked to avoid.
  • the actuating forces of the valve are effectively reduced to the adhesive forces of the paint layer in the valve seat.
  • the exhaust gas recirculation valve This can be anywhere between the cylinder head and Abgaszu211 leverage be provided. By the separation of the exhaust gas recirculation valve from that in the fresh air entrained ⁇ 1 the crankcase breather is also clogging by a soot-oil mixture prevented.
  • the integrated part of the exhaust gas recirculation line inside the cylinder head from the exhaust side running to the inlet side, between an end face of the Cylinder head and an outer cylinder is provided.
  • the temperature level the exhaust gas is after the internal part of the return line still high enough to light the valve or the valve seat to avoid.
  • the temperature level the exhaust gases in the integrated part of the exhaust pipe sufficiently reduced and thus the materials of the exhaust gas recirculation valve not overused.
  • the external part of the exhaust gas recirculation line has two channels, wherein the first channel is connected to the cooling water circuit of the cylinder head and the second channel serves as the actual exhaust gas recirculation line and that between the cylinder head and the external part of the exhaust gas recirculation line another valve for regulation the cooling water flow is provided in this part of the exhaust gas recirculation line.
  • the first channel or the cooling water channel is in this case via the exhaust gas recirculation valve with the cooling water circuit of the cylinder head in operative connection.
  • the exhaust gas recirculation valve With the distance of the exhaust gas recirculation valve to the cylinder head thus the associated exhaust gas temperature can be varied.
  • the exhaust gas recirculation valve is in operative connection with a cooling device of the cylinder head.
  • the exhaust gas recirculation valve ge cools and thus the actuator of the exhaust gas recirculation valve are protected against overheating in case of need or at full load.
  • the exhaust gas supply an inlet for fresh air and an inlet opening for exhaust gas and an outlet for Fresh air and an outlet for exhaust gas, wherein the outlet for exhaust gas centric in the outlet opening is arranged for fresh air.
  • the temperature level of the exhaust gases sink the critical area. The lacquer formation would thus favors, with the leaching of the flow channels at this Make no impact on the functioning of the exhaust gas supply Has.
  • the exhaust gas supply occurs although with the fresh air flow and thus also with the Fresh air flow entrained crankcase breather oil Contact, due to the centric inflow of the exhaust gas in but the fresh air flow is the over the fresh air flow entrained 6l of the crankcase ventilation and the soot content evenly mixed in the wake of the outlet opening or distributed and thus carried by the fresh air flow. Also the oil carried along the wall of the fresh air duct leads into Connection with the centric inflowing soot not to a clogging of the cable cross-sections. The lacquer formation and the clogging of the exhaust gas supply device or the guide channels is thus prevented.
  • the exhaust gas recirculation valve a pneumatic or electro-mechanically operated actuator with one in the closed position of the exhaust gas recirculation valve having self-locking actuator.
  • the electro mechanical actuator sits directly on the exhaust gas recirculation valve and is controlled via the motor cable set.
  • the pneumatic control and the electro-pneumatic converter fall in this Training away.
  • the inlet opening for Fresh air to the charge air line, the inlet opening for Exhaust gas to the external exhaust gas recirculation line, the outlet opening for fresh air to the charge air distributor and the outlet openings for exhaust also to the charge air manifold are connected.
  • the exhaust gas flow is thus the fresh air flow admixed. After the centric outlet of the exhaust gas in the fresh air flow begins the mixing process of the two Gas streams. This produces no significant soot- ⁇ 1 deposits in the field of exhaust gas supply and clogging will be prevented.
  • the exhaust gas recirculation valve in Seen flow direction directly in front of the Abgaszu211 landmark is provided, wherein the exhaust gas recirculation valve and the exhaust gas supply functionally arranged in a housing and via the inlet opening for exhaust gas in flow connection are.
  • the functional separation of exhaust gas recirculation valve and exhaust gas supply device ensures that the exhaust gas recirculation valve does not flow around the fresh air flow and thus not is cooled.
  • Fig. 1 with 5 an on and with 2 denotes an exhaust pipe system of an internal combustion engine, not shown, which is equipped with an exhaust gas recirculation system 1 1.
  • an air filter 13 On the outlet side, an air filter 13 is provided, to which a fresh air charger 15 and a charge air line 8 is connected.
  • a catalyst 14 On the outlet side is a catalyst 14, to which an exhaust system 16 is connected.
  • a charge air cooler 6 In the charge air line 8, a charge air cooler 6 is integrated and after the charge air line 8 is a Abgaszulite shimmer 10.
  • the Abgaszulite shimmer 10 is connected via an external part 4 'of the exhaust gas recirculation line with an exhaust gas recirculation valve 9, via an integrated part 4 of the exhaust gas recirculation line to the outlet side of Internal combustion engine communicates.
  • the exhaust gas supply device 10 is connected via a charge air distributor 7 to intake ports 17.
  • the fresh air is sucked in via the air filter 13 and compressed by the fresh air charger 15.
  • the fresh air charger 15 is driven on the exhaust side of the outflowing exhaust gases, which then flow through the catalyst 14 and the exhaust system 16 to the outside.
  • the compressed fresh air is called charge air in the intercooler 6 cooled and continue on the charge air line 8 and the Abgaszucited modelling 10 supplied to the charge air manifold 7.
  • the compressed and cooled Fresh air exhaust gas added.
  • the exhaust gas is here via the integrated in a cylinder head 3 Part 4 of the exhaust gas recirculation line the exhaust gas recirculation valve 9 is supplied. over the external part 4 'of the exhaust gas recirculation line is so regulated Exhaust gas passed to the exhaust gas supply device 10.
  • the exhaust gas recirculation valve 9 regulates via a controller 11 (FIG. the supplied in the exhaust gas supply 10 of the fresh air Exhaust gas flow, so that in the charge air manifold 7 a homogeneous Fresh air exhaust gas mixture is formed.
  • This homogeneous fresh air exhaust gas mixture is shown via the inlet channels 17 in Fig. 2 Cylinders 18 supplied.
  • the integrated part 4 of the exhaust gas recirculation line runs within of the cylinder head 3 from the exhaust side to the intake side and connects to the exhaust gas recirculation valve 9.
  • the external part 4 'of the exhaust gas recirculation line has two channels 27, 28, wherein the first channel 28 with the cooling water circuit the cylinder head is connected and the second channel 27 serves as the actual exhaust gas recirculation line.
  • Between the cylinder head 3 and the external part 4 'of the exhaust gas recirculation line is another, not shown valve for regulation the cooling water flow in this part of the exhaust gas recirculation line provided, depending on the operating point the exhaust gas temperature can be controlled.
  • Fig. 2 the inventive arrangement of the exhaust gas recirculation valve 9 and the exhaust gas supply device 10 in connection with the inlet and outlet piping system 5, 2 is shown schematically. It is advantageous that the exhaust gas recirculation valve 9 and the exhaust gas supply device 10 are arranged separately. In this context, it is also possible to provide the exhaust gas recirculation valve 9 seen in the flow direction at the end of the external part 4 'of the exhaust gas recirculation line and to arrange it with the exhaust gas supply device 10 of the type in a common housing, that the exhaust gas recirculation valve 9 is still arranged in the exhaust stream on the one hand and on the other is not cooled by the fresh air stream.
  • the exhaust gas recirculation valve 9 is directly behind the cylinder head. 3 arranged in the region of the cold side of the internal combustion engine and is via the integrated part 4 of the exhaust gas recirculation line, between an end face of the cylinder head 3 and the outer cylinder 18 is provided with exhaust gas.
  • the exhaust gas supply device 10 is, seen in the flow direction, arranged in front of the charge air distributor 7 and is connected via the external part 4 'of the exhaust gas recirculation line from the exhaust gas recirculation valve 9 supplied with exhaust gas. About the charge air manifold 7 and the intake ports 17 will be the fresh air exhaust mixture to the cylinders 18 supplied.
  • the external part 4 'of the exhaust gas recirculation line and the exhaust gas recirculation valve 9 stand with the cooling water circuit of the cylinder head 3 in operative connection.
  • the operating temperature of the exhaust gas in Exhaust gas recirculation valve 9 and in the external part 4 'of the exhaust gas recirculation line be controlled via the cooling water flow.
  • FIGS. 3 and 4 each show a section of the exhaust gas recirculation valve 9 with the integrated Abgaszu slaughter 10.
  • the Exhaust gas recirculation valve 9 has a valve body 23, a control axis 24, an actuator 25 and a servomotor 26, which are arranged coaxially with respect to a valve axis 29.
  • the adjusting axis 24 and thus the valve body 23 are over the intended actuator 25, which is designed as a cam, by means of a rotational movement of the servomotor 26 vertically between their two end positions moved.
  • the valve body 23 in both end positions self-locking, i. in the closed state holds the upcoming exhaust gas pressure Valve closed and in open condition is the servomotor due to the cam arrangement force or torque free.
  • the fresh air flow occurs left through an inlet opening 19 for fresh air into the exhaust gas supply 10 and becomes radial, here from below, Charged with exhaust gas via an inlet opening 20 for exhaust gas.
  • the exhaust gas flow passes through an exhaust gas outlet opening 22 in the fluid axis 30 of the fresh air flow on and is on the way to the charge air distributor 7 or in the charge air distributor 7 mixed.
  • the fresh air flow causes oil to escape from the crankcase breather carried. This entrained oil and the soot content of the mixed exhaust gas are partially mixed and thus by carried the gas stream.
  • the fresh air-exhaust mixture is supplied via the inlet ports 17 to the cylinders 18.
  • Fig. 5 is shown with 31 en housing that the exhaust gas recirculation valve 9 and the Abgaszu 1500voriques 10 receives.
  • the housing 31 has a separating surface 32, which is the exhaust gas recirculation valve 9 separates from the fresh air flow, so this is not cooled by the fresh air stream.
  • the exhaust gases occur in this case from the exhaust gas recirculation valve 9 via the inlet opening 20 for exhaust gas in the Abgaszu 1500voriques 10th and are with the entering through the inlet opening 19 Fresh air mixed.
  • About the outlet opening 21 and 22nd the gas mixture is fed to the charge air manifold.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Description

Die Erfindung bezieht sich auf eine Abgasrückführanlage für eine Brennkraftmaschine mit einem einem Zylinderkopf zugeordneten Ein- und Auslassleitungssystem eines Zylinderkopfs, das eine Ladeluftleitung aufweist, der über eine Abgasrückführleitung und ein Abgasrückführventil Abgas zugeführt wird, wobei das Abgasrückführventil, in Strömungsrichtung gesehen, nach dem Zylinderkopf und vor einer davon getrennten Abgaszuführeinrichtung angeordnet ist, die als Mischvorrichtung ausgebildet ist.The invention relates to an exhaust gas recirculation system for an internal combustion engine with a cylinder head associated Inlet and outlet piping of a cylinder head, the has a charge air line, which via an exhaust gas recirculation line and an exhaust gas recirculation valve is supplied to exhaust gas, wherein the exhaust gas recirculation valve, seen in the flow direction, after the cylinder head and in front of a separate exhaust gas supply is arranged, which is formed as a mixing device is.

Es ist bereits eine Vorrichtung der eingangs aufgeführten Art bekannt, die das Abgasrückführventil mit integrierter Abgaszuführeinrichtung vor dem Ladeluftverteiler vorsieht. Hierbei werden die zurückgeführten Abgase in der Abgasrückführleitung bei Teillast abgekühlt. Die Abgase bilden in einem gewissen Temperaturbereich einen sog. Lack, der das einwandfreie Arbeiten des Abgasrückführventils verhindert. Die Druckschrift D 1 1 (EP 0 080 327 A2) zeigt bereits ein Abgasrückführsystem, bei dem innerhalb einer Abgasrückführleitung ein Regelventil angeordnet ist. Das Regelventil ist hierbei in die Abgasrückführleitung stromabwärts vor einer Abgaszuführeinrichtung und nach einem Abgaskühler integriert. It is already a device of the type mentioned known, the exhaust gas recirculation valve with integrated Abgaszuführeinrichtung in front of the charge air distributor. in this connection the recirculated exhaust gases are in the exhaust gas recirculation line cooled at partial load. The exhaust gases form in a certain Temperature range a so-called paint, the perfect work the exhaust gas recirculation valve prevented. The document D 1 1 (EP 0 080 327 A2) already shows an exhaust gas recirculation system, at arranged within a exhaust gas recirculation line, a control valve is. The control valve is here in the exhaust gas recirculation line downstream of an exhaust gas supply device and downstream integrated in an exhaust gas cooler.

Die Druckschrift D 2 (JP-A-11082184) zeigt ebenfalls ein Abgasrückführsystem, bei dem innerhalb einer Abgasrückführleitung ein Regelventil angeordnet ist. Das Regelventil ist hierbei vor einem Ladeluftverteiler vorgesehen.Document D 2 (JP-A-11082184) also shows an exhaust gas recirculation system, at the inside of an exhaust gas recirculation line a control valve is arranged. The control valve is here provided in front of a charge air distributor.

Die Druckschrift D 3 (DE 197 25 668 C1) zeigt eine Abgasrückführeinrichtung mit zwei Eintrittsöffnungen für Frischluft und Abgas sowie zwei Austrittsöffnungen für Frischluft und Abgas, wobei die Austrittsöffnung für Abgas zentrisch in der Austrittsöffnung für Frischluft angeordnet ist.The document D 3 (DE 197 25 668 C1) shows an exhaust gas recirculation device with two inlet openings for fresh air and Exhaust gas and two outlet openings for fresh air and exhaust gas, wherein the exhaust gas outlet opening is centered in the outlet opening is arranged for fresh air.

Demgemäß besteht die Erfindungsaufgabe darin, das Abgasrückführventil und die Abgaszuführeinrichtung derart auszubilden und anzuordnen, daß eine wartungsfreie Abgasrückführung und eine optimale Abgastemperatur gewährleistet wird.Accordingly, the invention task is the exhaust gas recirculation valve and form the exhaust gas supply device in such a way and arrange that a maintenance-free exhaust gas recirculation and an optimal exhaust gas temperature is ensured.

Gelöst wird die Aufgabe erfindungsgemäß dadurch, daß das Abgasrückführventil direkt hinter dem Zylinderkopf im Bereich der kalten Seite des Zylinderkopfs der Brennkraftmaschine angeordnet ist und an einen im Zylinderkopf integrierten Teil der Abgasrückführleitung anschließt. Hierdurch wird erreicht daß das Temperaturniveau der Abgase im integrierten Teil der Abgasleitung ausreichend reduziert wird und damit die Werkstoffe des Abgasrückführventils nicht übermäßig beanspruchen werden. Andererseits ist das Temperaturniveau der Abgase noch ausreichend hoch, um ein Verlacken des Ventils bzw. des Ventilsitzes zu vermeiden. Neben der Lebensdauer des Abgasrückführventil reduzieren sich die Stellkräfte des Ventils effektiv um die Klebekräfte der Lackschicht im Ventilsitz. Auch ein Versagen des Abgasrückführventils aufgrund zu hoher Klebekräfte wird durch das ausreichend große Temperaturniveau der Abgase verhindert. Der kritische Temperaturbereich der Lackbildung wird auf jeden Fall nach dem Kaltstart des Motors durchlaufen, so daß im stationären Normalbetrieb die kritische Temperatur überschritten ist. Zudem ist dem in einem externen Teil der Abgasrückführleitung angeordneten Abgasrückführventil eine davon getrennte Abgaszuführeinrichtung zugeordnet. Hierdurch wird erreicht, daß einerseits das Abgasrückführventil nicht mit dem Frischluftstrom und damit auch nicht mit dem im Frischluftstrom mitgeführten Ö1 der Kurbelgehäuseentlüftung in Kontakt tritt und andererseits eine Kühlung des Abgasrückführventils durch den Frischluftstrom verhindert wird. Das Abgasrückführventil kann hierbei an beliebiger Stelle zwischen Zylinderkopf und Abgaszuführeinrichtung vorgesehen sein. Durch die Trennung des Abgasrückführventils von dem in der Frischluft mitgeführten Ö1 der Kurbelgehäuseentlüftung wird zudem ein Zusetzen durch ein Ruß-Öl-Gemisch verhindert.The object is achieved according to the invention characterized in that the exhaust gas recirculation valve directly behind the cylinder head in the area the cold side of the cylinder head of the internal combustion engine arranged is and to a built-in cylinder head part the exhaust gas recirculation line connects. This is achieved that the temperature level of the exhaust gases in the integrated part of Exhaust pipe is sufficiently reduced and thus the materials Do not overstress the exhaust gas recirculation valve become. On the other hand, the temperature level of the exhaust gases is still sufficiently high to cause the valve or valve seat to become lightly baked to avoid. In addition to the life of the exhaust gas recirculation valve The actuating forces of the valve are effectively reduced to the adhesive forces of the paint layer in the valve seat. Also a Failure of the exhaust gas recirculation valve due to excessive adhesive forces is due to the sufficiently high temperature level of the exhaust gases prevented. The critical temperature range of paint formation will definitely go through after the engine's cold start, so that in stationary normal operation, the critical temperature is exceeded. In addition, in an external part of the Exhaust gas recirculation line arranged exhaust gas recirculation valve one of them assigned separate exhaust gas supply. hereby is achieved that on the one hand, the exhaust gas recirculation valve not with the fresh air flow and thus not with the im Fresh air flow entrained oil of the crankcase breather in Contact occurs and on the other hand cooling the exhaust gas recirculation valve is prevented by the fresh air flow. The exhaust gas recirculation valve This can be anywhere between the cylinder head and Abgaszuführeinrichtung be provided. By the separation of the exhaust gas recirculation valve from that in the fresh air entrained Ö1 the crankcase breather is also clogging by a soot-oil mixture prevented.

Ferner ist es vorteilhaft, daß der integrierte Teil der Abgasrückführleitung innerhalb des Zylinderkopfs von der Auslaßseite zur Einlaßseite verlaufend, zwischen einer Stirnseite des Zylinderkopfs und einem äußeren Zylinder vorgesehen ist. Somit wird eine über das Kühlmittel steuerbare und effiziente Kühlung dieses Teils der Abgasrückführleitung möglich. Das Temperaturniveau der Abgase ist nach dem internen Teil der Rückführleitung noch ausreichend hoch, um ein Verlacken des Ventils bzw. des Ventilsitzes zu vermeiden. Zudem wird das Temperaturniveau der Abgase im integrierten Teil der Abgasleitung ausreichend reduziert und damit die Werkstoffe des Abgasrückführventils nicht übermäßig beansprucht.Furthermore, it is advantageous that the integrated part of the exhaust gas recirculation line inside the cylinder head from the exhaust side running to the inlet side, between an end face of the Cylinder head and an outer cylinder is provided. Thus is a controllable via the coolant and efficient cooling this part of the exhaust gas recirculation line possible. The temperature level the exhaust gas is after the internal part of the return line still high enough to light the valve or the valve seat to avoid. In addition, the temperature level the exhaust gases in the integrated part of the exhaust pipe sufficiently reduced and thus the materials of the exhaust gas recirculation valve not overused.

Eine zusätzliche Möglichkeit ist gemäß einer Weiterbildung der erfindungsgemäßen Vorrichtung, daß die Abgasrückführleitung aus dem im Zylinderkopf integrierten Teil und einem externen Teil besteht, wobei dem im externen Teil oder anschließend an den externen Teil der Abgasrückführleitung angeordneten Abgasrückführventil eine davon getrennte Abgaszuführeinrichtung zugeordnet ist, und die Abgaszuführeinrichtung, in Strömungsrichtung gesehen, vor einem Ladeluftverteiler und nach dem Abgasrückführventil angeordnet ist.An additional possibility is according to a development of Device according to the invention that the exhaust gas recirculation line from the cylinder head integrated part and an external one Part exists, the one in the external part or subsequently the external part of the exhaust gas recirculation line arranged exhaust gas recirculation valve associated with a separate exhaust gas supply is, and the Abgaszuführeinrichtung, in the flow direction seen, in front of a charge air manifold and after the exhaust gas recirculation valve is arranged.

Vorteilhaft ist es auch, daß der externe Teil der Abgasrückführleitung zwei Kanäle aufweist, wobei der erste Kanal mit dem Kühlwasserkreislauf des Zylinderkopfs verbunden ist und der zweite Kanal als eigentliche Abgasrückführleitung dient und daß zwischen dem Zylinderkopf und dem externen Teil der Abgasrückführleitung ein weiteres Ventil zur Regulierung des Kühlwasserstroms in diesem Teil der Abgasrückführleitung vorgesehen ist. Hierdurch kann das Temperaturniveau des Abgasstroms nach dem Abgasrückführventil, innerhalb des externen Teils der Abgasrückführleitung geregelt und angepaßt werden. Der erste Kanal bzw. der Kühlwasserkanal steht hierbei über das Abgasrückführventil mit dem Kühlwasserkreislauf des Zylinderkopfs in Wirkverbindung. Mit dem Abstand des Abgasrückführventils zum Zylinderkopf kann somit die damit verbundene Abgastemperatur variiert werden.
Von besonderer Bedeutung ist für die vorliegende Erfindung, daß das Abgasrückführventil mit einer Kühleinrichtung des Zylinderkopfs in Wirkverbindung steht. Hierdurch kann im Bedarfsfall bzw. im Vollastbetrieb das Abgasrückführventil ge kühlt und damit der Steller des Abgasrückführventils vor Überhitzung geschützt werden.It is also advantageous that the external part of the exhaust gas recirculation line has two channels, wherein the first channel is connected to the cooling water circuit of the cylinder head and the second channel serves as the actual exhaust gas recirculation line and that between the cylinder head and the external part of the exhaust gas recirculation line another valve for regulation the cooling water flow is provided in this part of the exhaust gas recirculation line. In this way, the temperature level of the exhaust gas flow to the exhaust gas recirculation valve, can be controlled and adjusted within the external part of the exhaust gas recirculation line. The first channel or the cooling water channel is in this case via the exhaust gas recirculation valve with the cooling water circuit of the cylinder head in operative connection. With the distance of the exhaust gas recirculation valve to the cylinder head thus the associated exhaust gas temperature can be varied.
Of particular importance for the present invention is that the exhaust gas recirculation valve is in operative connection with a cooling device of the cylinder head. As a result, the exhaust gas recirculation valve ge cools and thus the actuator of the exhaust gas recirculation valve are protected against overheating in case of need or at full load.

Gemäß einer bevorzugten Ausführungsform der erfindungsgemäßen Lösung ist schließlich vorgesehen, daß die Abgaszuführeinrichtung eine Eintrittsöffnung für Frischluft und eine Eintrittsöffnung für Abgas sowie eine Austrittsöffnung für Frischluft und eine Austrittsöffnung für Abgas aufweist, wobei die Austrittsöffnung für Abgas zentrisch in der Austrittsöffnung für Frischluft angeordnet ist. Vor dem Ladeluftverteiler kann bei Teillastbetrieb das Temperaturniveau der Abgase auf den kritischen Bereich absinken. Die Lackbildung würde somit begünstigt, wobei das Verlacken der Strömungskanäle an dieser Stelle keinerlei Auswirkung auf die Funktionsfähigkeit der Abgaszuführeinrichtung hat. Die Abgaszuführeinrichtung tritt zwar mit dem Frischluftstrom und damit auch mit dem vom Frischluftstrom mitgeführten Öl der Kurbelgehäuseentlüftung in Kontakt, aufgrund der zentrischen Einströmung des Abgases in den Frischluftstrom wird aber das über den Frischluftstrom mitgeführte 6l der Kurbelgehäuseentlüftung und der Rußanteil gleichmäßig im Nachlauf der Austrittsöffnung gemischt bzw. verteilt und somit durch den Frischluftstrom mitgetragen. Auch das an der Wand der Frischluftleitung mitgeführte Öl führt in Verbindung mit dem zentrisch einströmenden Rußanteil nicht zu einem Zusetzen der Leitungsquerschnitte. Die Lackbildung und das Zusetzen der Abgaszuführvorrichtung bzw. der Führungskanäle wird somit verhindert.According to a preferred embodiment of the invention Solution is finally provided that the exhaust gas supply an inlet for fresh air and an inlet opening for exhaust gas and an outlet for Fresh air and an outlet for exhaust gas, wherein the outlet for exhaust gas centric in the outlet opening is arranged for fresh air. In front of the charge air manifold can at partial load operation, the temperature level of the exhaust gases sink the critical area. The lacquer formation would thus favors, with the leaching of the flow channels at this Make no impact on the functioning of the exhaust gas supply Has. The exhaust gas supply occurs Although with the fresh air flow and thus also with the Fresh air flow entrained crankcase breather oil Contact, due to the centric inflow of the exhaust gas in but the fresh air flow is the over the fresh air flow entrained 6l of the crankcase ventilation and the soot content evenly mixed in the wake of the outlet opening or distributed and thus carried by the fresh air flow. Also the oil carried along the wall of the fresh air duct leads into Connection with the centric inflowing soot not to a clogging of the cable cross-sections. The lacquer formation and the clogging of the exhaust gas supply device or the guide channels is thus prevented.

Im Zusammenhang mit der erfindungsgemäßen Ausbildung und Anordnung ist es von Vorteil, daß das Abgasrückführventil einen pneumatisch oder elektro-mechanisch ausgeführten Steller mit einem in der geschlossenen Position des Abgasrückführventils selbsthemmend ausgebildeten Stellglied aufweist. Der elektro mechanische Steller sitzt direkt am Abgasrückführventil und wird über den Motorkabelsatz angesteuert. Die pneumatische Ansteuerung und der elektro-pneumatische Wandler fallen bei dieser Ausbildung weg.In connection with the inventive design and arrangement it is advantageous that the exhaust gas recirculation valve a pneumatic or electro-mechanically operated actuator with one in the closed position of the exhaust gas recirculation valve having self-locking actuator. The electro mechanical actuator sits directly on the exhaust gas recirculation valve and is controlled via the motor cable set. The pneumatic control and the electro-pneumatic converter fall in this Training away.

Vorteilhaft ist es ferner, daß die Eintrittsöffnung für Frischluft an die Ladeluftleitung, die Eintrittsöffnung für Abgas an die externe Abgasrückführleitung, die Austrittsöffnung für Frischluft an den Ladeluftverteiler und die Austrittsöffnungen für Abgas ebenfalls an den Ladeluftverteiler angeschlossen sind. Der Abgasstrom wird somit dem Frischluftstrom zugemischt. Nach dem zentrischen Austritt des Abgases in den Frischluftstrom beginnt der Mischprozess der beiden Gasströme. Hierbei entstehen keine wesentlichen Ruß-Ö1-Ablagerungen im Bereich der Abgaszuführeinrichtung und ein Zusetzen wird verhindert.It is also advantageous that the inlet opening for Fresh air to the charge air line, the inlet opening for Exhaust gas to the external exhaust gas recirculation line, the outlet opening for fresh air to the charge air distributor and the outlet openings for exhaust also to the charge air manifold are connected. The exhaust gas flow is thus the fresh air flow admixed. After the centric outlet of the exhaust gas in the fresh air flow begins the mixing process of the two Gas streams. This produces no significant soot-Ö1 deposits in the field of exhaust gas supply and clogging will be prevented.

Ferner ist es vorteilhaft, daß das Abgasrückführventil in Strömungsrichtung gesehen direkt vor der Abgaszuführeinrichtung vorgesehen ist, wobei das Abgasrückführventil und die Abgaszuführeinrichtung funktional in einem Gehäuse angeordnet und über die Eintrittsöffnung für Abgas in Durchflußverbindung sind. Die funktionale Trennung von Abgasrückführventil und Abgaszuführeinrichtung gewährleistet, daß das Abgasrückführventil nicht vom Frischluftstrom umströmt und somit auch nicht gekühlt wird.Furthermore, it is advantageous that the exhaust gas recirculation valve in Seen flow direction directly in front of the Abgaszuführeinrichtung is provided, wherein the exhaust gas recirculation valve and the exhaust gas supply functionally arranged in a housing and via the inlet opening for exhaust gas in flow connection are. The functional separation of exhaust gas recirculation valve and exhaust gas supply device ensures that the exhaust gas recirculation valve does not flow around the fresh air flow and thus not is cooled.

Weitere Vorteile und Einzelheiten der Erfindung sind in den Patentansprüchen und in der Beschreibung erläutert und in den Figuren dargestellt. Es zeigt:

Figur 1
eine perspektivische Darstellung des Ein- und Auslaßleitungssystems einer Brennkraftmaschine,
Figur 2
eine schematische Darstellung der erfindungsgemäßen Abgasrückführeinrichtung in der Ansicht von oben gemäß Fig. 1,
Figur 3
Eine Schnittdarstellung eines Abgasrückführventils mit integrierter Abgaszuführeinrichtung entlang der Linie B-B in Fig. 4,
Figur 4
Eine Schnittdarstellung eines Abgasrückführventils mit integrierter Abgaszuführeinrichtung entlang der Linie A-A in Fig. 3,
Figur 5
eine schematische Darstellung des Abgasrückführventils und der Abgaszuführeinrichtung in einem Gehäuse.
Further advantages and details of the invention are explained in the patent claims and in the description and illustrated in the figures. It shows:
FIG. 1
a perspective view of the inlet and outlet piping of an internal combustion engine,
FIG. 2
1 is a schematic representation of the exhaust gas recirculation device according to the invention in the top view according to FIG. 1,
FIG. 3
A sectional view of an exhaust gas recirculation valve with integrated exhaust gas supply device along the line BB in Fig. 4,
FIG. 4
A sectional view of an exhaust gas recirculation valve with integrated exhaust gas supply device along the line AA in Fig. 3,
FIG. 5
a schematic representation of the exhaust gas recirculation valve and the exhaust gas supply in a housing.

In den Zeichnungen ist in Fig. 1 mit 5 ein Ein- und mit 2 ein Auslaßleitungssystem einer nicht dargestellten Brennkraftmaschine bezeichnet, die mit einer Abgasrückführanlage 1 1 ausgestattet ist. Auslaßseitig ist ein Luftfilter 13 vorgesehen, an den sich ein Frischluftlader 15 und eine Ladeluftleitung 8 anschließt. Ebenfalls auslaßseitig befindet sich ein Katalysator 14, an den eine Abgasanlage 16 angeschlossen ist. In die Ladeluftleitung 8 ist ein Ladeluftkühler 6 integriert und nach der Ladeluftleitung 8 befindet sich eine Abgaszuführeinrichtung 10. Die Abgaszuführeinrichtung 10 ist über einen externen Teil 4' der Abgasrückführleitung mit einem Abgasrückführventil 9 verbunden, das über einen integrierten Teil 4 der Abgasrückführleitung mit der Auslaßseite der Brennkraftmaschine in Verbindung steht. Weiterhin ist die Abgaszuführeinrichtung 10 über einen Ladeluftverteiler 7 an Einlaßkanäle 17 angeschlossen.
Die Frischluft wird über den Luftfilter 13 angesaugt und mittels des Frischluftladers 15 verdichtet. Der Frischluftlader 15 wird abgasseitig von den ausströmenden Abgasen angetrieben, die dann über den Katalysator 14 und die Abgasanlage 16 ins Freie ausströmen.In the drawings, in Fig. 1 with 5 an on and with 2 denotes an exhaust pipe system of an internal combustion engine, not shown, which is equipped with an exhaust gas recirculation system 1 1. On the outlet side, an air filter 13 is provided, to which a fresh air charger 15 and a charge air line 8 is connected. Also on the outlet side is a catalyst 14, to which an exhaust system 16 is connected. In the charge air line 8, a charge air cooler 6 is integrated and after the charge air line 8 is a Abgaszuführeinrichtung 10. The Abgaszuführeinrichtung 10 is connected via an external part 4 'of the exhaust gas recirculation line with an exhaust gas recirculation valve 9, via an integrated part 4 of the exhaust gas recirculation line to the outlet side of Internal combustion engine communicates. Furthermore, the exhaust gas supply device 10 is connected via a charge air distributor 7 to intake ports 17.
The fresh air is sucked in via the air filter 13 and compressed by the fresh air charger 15. The fresh air charger 15 is driven on the exhaust side of the outflowing exhaust gases, which then flow through the catalyst 14 and the exhaust system 16 to the outside.

Die verdichtete Frischluft wird als Ladeluft im Ladeluftkühler 6 gekühlt und weiter über die Ladeluftleitung 8 und die Abgaszuführeinrichtung 10 dem Ladeluftverteiler 7 zugeführt. In der Abgaszuführeinrichtung 10 wird der verdichteten und gekühlten Frischluft Abgas zugemischt. Das Abgas wird hierbei über den in einem Zylinderkopf 3 integrierten Teil 4 der Abgasrückführleitung dem Abgasrückführventil 9 zugeführt. Über den externe Teil 4' der Abgasrückführleitung wird der so geregelte Abgasstrom zur Abgaszuführeinrichtung 10 geleitet.The compressed fresh air is called charge air in the intercooler 6 cooled and continue on the charge air line 8 and the Abgaszuführeinrichtung 10 supplied to the charge air manifold 7. In the exhaust gas supply 10, the compressed and cooled Fresh air exhaust gas added. The exhaust gas is here via the integrated in a cylinder head 3 Part 4 of the exhaust gas recirculation line the exhaust gas recirculation valve 9 is supplied. over the external part 4 'of the exhaust gas recirculation line is so regulated Exhaust gas passed to the exhaust gas supply device 10.

Das Abgasrückführventil 9 regelt über einen Steller 11 (Fig.4) den in der Abgaszuführeinrichtung 10 der Frischluft zugeführten Abgasstrom, so daß im Ladeluftverteiler 7 ein homogenes Frischluft-Abgasgemisch entsteht. Dieses homogene Frischluft-Abgasgemisch wird über die Einlaßkanäle 17 in Fig. 2 dargestellten Zylindern 18 zugeführt.The exhaust gas recirculation valve 9 regulates via a controller 11 (FIG. the supplied in the exhaust gas supply 10 of the fresh air Exhaust gas flow, so that in the charge air manifold 7 a homogeneous Fresh air exhaust gas mixture is formed. This homogeneous fresh air exhaust gas mixture is shown via the inlet channels 17 in Fig. 2 Cylinders 18 supplied.

Der integrierte Teil 4 der Abgasrückführleitung verläuft innerhalb des Zylinderkopfs 3 von der Auslaßseite zur Einlaßseite und schließt an das Abgasrückführventil 9 an. Hierbei gibt der Abgasstrom bereits Wärme an den Zylinderkopf ab. Der externe Teil 4' der Abgasrückführleitung weist zwei Kanäle 27, 28 auf, wobei der erste Kanal 28 mit dem Kühlwasserkreislauf des Zylinderkopfs verbunden ist und der zweite Kanal 27 als eigentliche Abgasrückführleitung dient. Zwischen dem Zylinderkopf 3 und dem externen Teil 4' der Abgasrückführleitung ist ein weiteres, nicht dargestelltes Ventil zur Regulierung des Kühlwasserstroms in diesem Teil der Abgasrückführleitung vorgesehen, damit in Abhängigkeit des Betriebspunkts die Abgastemperatur geregelt werden kann.The integrated part 4 of the exhaust gas recirculation line runs within of the cylinder head 3 from the exhaust side to the intake side and connects to the exhaust gas recirculation valve 9. Here are the exhaust flow already heat to the cylinder head. The external part 4 'of the exhaust gas recirculation line has two channels 27, 28, wherein the first channel 28 with the cooling water circuit the cylinder head is connected and the second channel 27 serves as the actual exhaust gas recirculation line. Between the cylinder head 3 and the external part 4 'of the exhaust gas recirculation line is another, not shown valve for regulation the cooling water flow in this part of the exhaust gas recirculation line provided, depending on the operating point the exhaust gas temperature can be controlled.

In Fig. 2 ist die erfindungsgemäße Anordnung des Abgasrückführventils 9 und der Abgaszuführeinrichtung 10 im Zusammenhang mit dem Ein- und Auslaßleitungssystem 5, 2 schematisch dargestellt. Hierbei ist es vorteilhaft, daß das Abgasrückführventil 9 und die Abgaszuführeinrichtung 10 getrennt angeordnet sind. In diesem Zusammenhang ist es auch möglich, das Abgasrückführventil 9 in Strömungsrichtung gesehen am Ende des externen Teils 4' der Abgasrückführleitung vorzusehen und es mit der Abgaszuführeinrichtung 10 der Art in einem gemeinsamen Gehäuse anzuordnen, daß das Abgasrückführventil 9 einerseits noch im Abgasstrom angeordnet ist und andererseits nicht vom Frischluftstrom gekühlt wird.In Fig. 2, the inventive arrangement of the exhaust gas recirculation valve 9 and the exhaust gas supply device 10 in connection with the inlet and outlet piping system 5, 2 is shown schematically. It is advantageous that the exhaust gas recirculation valve 9 and the exhaust gas supply device 10 are arranged separately. In this context, it is also possible to provide the exhaust gas recirculation valve 9 seen in the flow direction at the end of the external part 4 'of the exhaust gas recirculation line and to arrange it with the exhaust gas supply device 10 of the type in a common housing, that the exhaust gas recirculation valve 9 is still arranged in the exhaust stream on the one hand and on the other is not cooled by the fresh air stream.

Der Frischluftstrom und das durch den Frischluftstrom mitgeführte Öl der Kurbelgehäuseentlüftung treten erst in der Abgaszuführeinrichtung 10 mit dem Abgasstrom und dem darin mitgeführten Ruß in Kontakt. Hierbei wird das Zusetzen vorhandener Spalte des Abgasrückführventils 9 vermieden.The fresh air flow and the entrained by the fresh air flow Oil crankcase ventilation occur only in the Abgaszuführeinrichtung 10 with the exhaust stream and the entrained therein Soot in contact. Here, the clogging existing Column of the exhaust gas recirculation valve 9 avoided.

Das Abgasrückführventil 9 ist direkt hinter dem Zylinderkopf 3 im Bereich der kalten Seite der Brennkraftmaschine angeordnet und wird über den integrierten Teil 4 der Abgasrückführleitung, die zwischen einer Stirnseite des Zylinderkopfs 3 und dem äußeren Zylinder 18 vorgesehen ist, mit Abgas versorgt. Die Abgaszuführeinrichtung 10 ist, in Strömungsrichtung gesehen, vor dem Ladeluftverteiler 7 angeordnet und wird über den externen Teil 4' der Abgasrückführleitung vom Abgasrückführventil 9 mit Abgas versorgt. Über den Ladeluftverteiler 7 und die Einlaßkanäle 17 wird das Frischluft-Abgas Gemisch den Zylindern 18 zugeführt.The exhaust gas recirculation valve 9 is directly behind the cylinder head. 3 arranged in the region of the cold side of the internal combustion engine and is via the integrated part 4 of the exhaust gas recirculation line, between an end face of the cylinder head 3 and the outer cylinder 18 is provided with exhaust gas. The exhaust gas supply device 10 is, seen in the flow direction, arranged in front of the charge air distributor 7 and is connected via the external part 4 'of the exhaust gas recirculation line from the exhaust gas recirculation valve 9 supplied with exhaust gas. About the charge air manifold 7 and the intake ports 17 will be the fresh air exhaust mixture to the cylinders 18 supplied.

Der externe Teil 4' der Abgasrückführleitung sowie das Abgasrückführventil 9 stehen mit dem Kühlwasserkreislauf des Zylinderkopfs 3 in Wirkverbindung. Je nach Betriebspunkt kann zum Schutz vor Überhitzung oder zur Vermeidung von Lackbildung im Abgasrückführventil 9 die Betriebstemperatur des Abgases im Abgasrückführventil 9 und im externen Teil 4' der Abgasrückführleitung über den Kühlwasserstrom geregelt werden.The external part 4 'of the exhaust gas recirculation line and the exhaust gas recirculation valve 9 stand with the cooling water circuit of the cylinder head 3 in operative connection. Depending on the operating point can be Protection against overheating or to avoid paint formation in the Exhaust gas recirculation valve 9, the operating temperature of the exhaust gas in Exhaust gas recirculation valve 9 and in the external part 4 'of the exhaust gas recirculation line be controlled via the cooling water flow.

Fig. 3 und 4 zeigen jeweils einen Schnitt des Abgasrückführventils 9 mit der integrierten Abgaszuführeinrichtung 10. Das Abgasrückführventil 9 weist einen Ventilkörper 23, eine Stellachse 24, ein Stellglied 25 sowie einen Stellmotor 26 auf, die mit Bezug auf eine Ventilachse 29 koaxial angeordnet sind.FIGS. 3 and 4 each show a section of the exhaust gas recirculation valve 9 with the integrated Abgaszuführeinrichtung 10. The Exhaust gas recirculation valve 9 has a valve body 23, a control axis 24, an actuator 25 and a servomotor 26, which are arranged coaxially with respect to a valve axis 29.

Die Stellachse 24 und damit der Ventilkörper 23 werden über das vorgesehene Stellglied 25, das als Nocke ausgebildet ist, mittels einer Drehbewegung des Stellmotors 26 vertikal zwischen ihren beiden Endlagen bewegt. In dieser Ausführungsform ist der Ventilkörper 23 in beiden Endlagen selbsthemmend, d.h. in geschlossenem Zustand hält der anstehende Abgasdruck das Ventil geschlossen und in offenem Zustand ist der Stellmotor aufgrund der Nockenanordnung kräfte- bzw. momentenfrei.The adjusting axis 24 and thus the valve body 23 are over the intended actuator 25, which is designed as a cam, by means of a rotational movement of the servomotor 26 vertically between their two end positions moved. In this embodiment is the valve body 23 in both end positions self-locking, i. in the closed state holds the upcoming exhaust gas pressure Valve closed and in open condition is the servomotor due to the cam arrangement force or torque free.

Der in Fig. 4 nicht dargestellte Frischluftstrom tritt von links durch eine Eintrittsöffnung 19 für Frischluft in die Abgaszuführeinrichtung 10 ein und wird radial, hier von unten, über eine Eintrittsöffnung 20 für Abgas mit Abgas beschickt. Der Abgasstrom tritt durch eine Austrittsöffnung 22 für Abgas in der Strömungsmittelachse 30 des Frischluftstroms ein und wird auf dem Weg zum Ladeluftverteiler 7 bzw. im Ladeluftverteiler 7 gemischt.The fresh air flow, not shown in Fig. 4, occurs left through an inlet opening 19 for fresh air into the exhaust gas supply 10 and becomes radial, here from below, Charged with exhaust gas via an inlet opening 20 for exhaust gas. The exhaust gas flow passes through an exhaust gas outlet opening 22 in the fluid axis 30 of the fresh air flow on and is on the way to the charge air distributor 7 or in the charge air distributor 7 mixed.

Durch den Frischluftstrom wird Öl aus der Kurbelgehäuseentlüftung mitgeführt. Dieses mitgeführte Öl und der Rußanteil des zugemischten Abgases werden teilweise gemischt und somit durch den Gasstrom mitgetragen. Das Frischluft-Abgas Gemisch wird über die Einlaßkanäle 17 den Zylindern 18 zugeführt.The fresh air flow causes oil to escape from the crankcase breather carried. This entrained oil and the soot content of the mixed exhaust gas are partially mixed and thus by carried the gas stream. The fresh air-exhaust mixture is supplied via the inlet ports 17 to the cylinders 18.

In Fig. 5 ist mit 31 en Gehäuse dargestellt, daß das Abgasrückführventil 9 und die Abgaszuführvorrichtung 10 aufnimmt. Das Gehäuse 31 weist eine Trennfläche 32 auf, die das Abgasrückführventil 9 vom Frischluftstrom trennt, so daß dieses durch den Frischluftstrom nicht gekühlt wird. Die Abgase treten hierbei vom Abgasrückführventil 9 aus über die Eintrittsöffnung 20 für Abgas in die Abgaszuführvorrichtung 10 ein und werden mit der über die Eintrittsöffnung 19 eintretenden Frischluft gemischt. Über die Austrittsöffnung 21 bzw. 22 wird das Gasgemisch zum Ladeluftverteiler geführt.In Fig. 5 is shown with 31 en housing that the exhaust gas recirculation valve 9 and the Abgaszuführvorrichtung 10 receives. The housing 31 has a separating surface 32, which is the exhaust gas recirculation valve 9 separates from the fresh air flow, so this is not cooled by the fresh air stream. The exhaust gases occur in this case from the exhaust gas recirculation valve 9 via the inlet opening 20 for exhaust gas in the Abgaszuführvorrichtung 10th and are with the entering through the inlet opening 19 Fresh air mixed. About the outlet opening 21 and 22nd the gas mixture is fed to the charge air manifold.

Claims (10)

  1. Exhaust gas recirculation system (1) for an internal-combustion engine comprising an inlet and outlet line system (5, 2) which can be connected to a cylinder head (3) and has a charge-air line (8) to which exhaust gas is fed via an exhaust gas recirculation line and an exhaust gas recirculation valve (9), the exhaust gas recirculation valve (9) being attachable downstream from the cylinder head (3), viewed in the flow direction, and being arranged upstream from an exhaust gas feed device (10) which is separate therefrom and designed as a mixing apparatus, characterised in that the exhaust gas recirculation valve (9) is arranged directly downstream from the cylinder head (3) in the region of the cold side of the cylinder head (3) of the internal-combustion engine and is adjacent to a part (4) of the exhaust gas recirculation line integrated in the cylinder head (3).
  2. Exhaust gas recirculation system according to claim 1, characterised in that the integrated part (4) of the exhaust gas recirculation line is provided extending inside the cylinder head (3) from the outlet side to the inlet side, between an end face of the cylinder head (3) and an outer cylinder (18).
  3. Exhaust gas recirculation system according to claim 2, characterised in that the exhaust gas recirculation line consists of the part (4) integrated in the cylinder head (3) and an external part (4'), wherein associated with the exhaust gas recirculation valve (9) arranged in or adjacent to the external part (4') of the exhaust gas recirculation line is an exhaust gas feed device (10) which is separate therefrom, and the exhaust gas feed device (10) is arranged upstream from the charge-air distributor (7) and downstream from the exhaust gas recirculation valve (9), viewed in the flow direction.
  4. Exhaust gas recirculation system according to claim 3, characterised in that the external part (4') of the exhaust gas recirculation line has two ducts (27, 28), the first duct (28) being connected to the cooling water circuit of the cylinder head (3) and the second duct (27) serving as the actual exhaust gas recirculation line.
  5. Exhaust gas recirculation system according to claim 4, characterised in that, between the cylinder head (3) and the external part (4') of the exhaust gas recirculation line, a further valve is provided for regulating the cooling water flow in this part of the exhaust gas recirculation line.
  6. Exhaust gas recirculation system according to any one of the preceding claims, characterised in that the exhaust gas recirculation valve (9) is in operative connection to a cooling device of the cylinder head (3).
  7. Exhaust gas recirculation system according to any one of the preceding claims, characterised in that the exhaust gas feed device (10) has an inlet aperture for fresh air (19) and an inlet aperture for exhaust gas (20) and an outlet aperture for fresh air (21) and an outlet aperture for exhaust gas (22), the outlet aperture (22) for exhaust gas being arranged centrally in the outlet aperture (21) for fresh air.
  8. Exhaust gas recirculation system according to any one of the preceding claims, characterised in that the exhaust gas recirculation valve (9) has a pneumatically or electro-mechanically designed actuator (11) comprising an actuating element (35) designed to be self-locking in the closed position of the exhaust gas recirculation valve (9).
  9. Exhaust gas recirculation system according to claim 7, characterised in that the inlet aperture (19) for fresh air is connected to the charge-air line (8), the inlet aperture (20) for exhaust gas is connected to the external part (4') of the exhaust gas recirculation line, the outlet aperture (21) for fresh air is connected to the charge-air distributor (7) and the outlet apertures (22) for exhaust gas are also connected to the charge-air distributor (7).
  10. Exhaust gas recirculation system according to any one of the preceding claims, characterised in that the exhaust gas recirculation valve (9) is provided directly upstream from the exhaust gas feed device (10), viewed in the flow direction, the exhaust gas recirculation valve (9) and the exhaust gas feed device (10) being arranged in a housing (31) and being in flow connection via the inlet aperture (20) for exhaust gas.
EP00109770A 1999-06-29 2000-05-09 Exhaust gas recirculation valve Expired - Lifetime EP1065365B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19929956A DE19929956C5 (en) 1999-06-29 1999-06-29 Exhaust gas recirculation valve
DE19929956 1999-06-29

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EP1065365A2 EP1065365A2 (en) 2001-01-03
EP1065365A3 EP1065365A3 (en) 2001-07-11
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Publication number Publication date
US6386188B1 (en) 2002-05-14
EP1065365A3 (en) 2001-07-11
DE19929956C5 (en) 2007-02-22
EP1065365A2 (en) 2001-01-03
DE50003699D1 (en) 2003-10-23
DE19929956A1 (en) 2001-01-11
DE19929956C2 (en) 2001-09-13

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