EP0515814A1 - Internal combustion engine with an exhaust gas post-treatment device - Google Patents

Internal combustion engine with an exhaust gas post-treatment device Download PDF

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Publication number
EP0515814A1
EP0515814A1 EP92106322A EP92106322A EP0515814A1 EP 0515814 A1 EP0515814 A1 EP 0515814A1 EP 92106322 A EP92106322 A EP 92106322A EP 92106322 A EP92106322 A EP 92106322A EP 0515814 A1 EP0515814 A1 EP 0515814A1
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EP
European Patent Office
Prior art keywords
internal combustion
combustion engine
exhaust gas
exhaust
exhaust valve
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EP92106322A
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German (de)
French (fr)
Inventor
Hans Dieter Wacker
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP0515814A1 publication Critical patent/EP0515814A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0005—Deactivating valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/011—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2053—By-passing catalytic reactors, e.g. to prevent overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis

Definitions

  • the invention relates to an internal combustion engine with a switchable exhaust gas aftertreatment device provided downstream of a combustion chamber exhaust valve.
  • a switchable exhaust gas aftertreatment device provided downstream of a combustion chamber exhaust valve.
  • the switchable exhaust gas aftertreatment device is designed as a so-called starting catalytic converter, which is located as close as possible to the cylinder head of the internal combustion engine.
  • a successful exhaust gas aftertreatment can already take place in the warm-up phase of the internal combustion engine, since the starting catalytic converter reaches the operating temperature required for a successful conversion of harmful exhaust gas components within a short time.
  • the object of the invention is therefore to show a more reliable way of switching an exhaust gas aftertreatment device on or off.
  • a combustible exhaust valve associated with the exhaust gas aftertreatment device is provided.
  • the combustion chamber of the internal combustion engine thus has at least one main exhaust valve, which is actuated in a known manner, in particular by a cam, and clears the way into an exhaust gas duct, which bypasses the switchable exhaust gas aftertreatment device, ie. H. in particular to form a starting catalyst.
  • a main catalytic converter which is always acted upon by exhaust gases, can be provided at a certain distance from the internal combustion engine, to which the exhaust gas duct of the main exhaust valve also leads.
  • the exhaust valves 4b downstream of which the starting catalytic converters 9 are provided, can be switched on and off.
  • these switchable exhaust valves 4b are thus opened as is known, so that a successful conversion of pollutants can take place in the switchable exhaust gas aftertreatment devices 9.
  • these switchable exhaust valves 4b remain closed, so that the exhaust gas is then only guided over the main catalytic converter 8, which has already been heated towards the end of the warm-up phase.
  • the main exhaust valve 4a can be deactivated; then the exhaust gases are passed completely over the switchable exhaust gas aftertreatment device 9.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

An internal combustion engine has at least two exhaust valves (4a, 4b) per cylinder and each of these valves can be activated or deactivated. A starting catalyst (9) is provided downstream of one of the two exhaust valves (4b). In the warm-up phase of the internal combustion engine, only the exhaust valve (4b) supplying the starting catalyst (9) is activated while, when the internal combustion engine has warmed up completely, the exhaust gas passes exclusively via the other exhaust valve(s) (4a) to a main catalyst (8). This allows a rapid response of the catalysts after a cold start of the internal combustion engine while, on the other hand, overheating of the catalysts is avoided. <IMAGE>

Description

Die Erfindung betrifft eine Brennkraftmaschine mit einer stromab eines Brennraum-Auslaßventiles vorgesehenen zuschaltbaren Abgas-Nachbehandlungsvorrichtung. Gezeigt ist eine derartige Abgasanlage beispielsweise in der EP 0 417 412 A2. Dort ist die zuschaltbare Abgas-Nachbehandlungsvorrichtung als sog. Startkatalysator ausgebildet, der sich möglichst nahe am Zylinderkopf der Brennkraftmaschine befindet. Hierdurch kann bereits in der Warmlaufphase der Brennkraftmaschine eine erfolgreiche Abgasnachbehandlung erfolgen, da der Startkatalysator seine für eine erfolgreiche Konvertierung schädlicher Abgasbestandteile erforderliche Betriebstemperatur binnen kurzer Zeit erreicht. Im stationären Dauerbetrieb der Brennkraftmaschine hingegen gilt es, den Startkatalysator vor allzu hohen Temperatureinwirkungen durch die heißen Brennkraftmaschinen-Abgase zu schützen, so daß dann diese Abgas-Nachbehandlungsvorrichtung abgeschaltet wird.The invention relates to an internal combustion engine with a switchable exhaust gas aftertreatment device provided downstream of a combustion chamber exhaust valve. Such an exhaust system is shown, for example, in EP 0 417 412 A2. There, the switchable exhaust gas aftertreatment device is designed as a so-called starting catalytic converter, which is located as close as possible to the cylinder head of the internal combustion engine. As a result, a successful exhaust gas aftertreatment can already take place in the warm-up phase of the internal combustion engine, since the starting catalytic converter reaches the operating temperature required for a successful conversion of harmful exhaust gas components within a short time. In steady-state operation of the internal combustion engine, on the other hand, it is important to protect the starting catalytic converter from excessive temperature effects caused by the hot internal combustion engine exhaust gases, so that this exhaust gas aftertreatment device is then switched off.

Bei der in der oben genannten Schrift gezeigten Abgasanlage erfolgt das Zuschalten bzw. Abschalten der Abgas-Nachbehandlungsvorrichtung durch öffnen bzw. Schließen eines Bypass-Kanales. Diese Lösung erfordert eine aufwendige, außerhalb der Brennkraftmaschine liegende und daher störanfällige Betätigungsvorrichtung.In the exhaust system shown in the abovementioned document, the exhaust gas aftertreatment device is switched on or off by opening or closing a bypass channel. This solution requires a complex, actuating device lying outside the internal combustion engine and therefore susceptible to faults.

Aufgabe der Erfindung ist es daher, eine demgegenüber betriebssicherere Möglichkeit zum Zuschalten bzw. Abschalten einer Abgas-Nachbehandlungsvorrichtung aufzuzeigen. Zur Lösung dieser Aufgabe ist vorgesehen, daß neben zumindest einem die zuschaltbare Abgas-Nachbehandlungsvorrichtung nicht beaufschlagenden Haupt-Auslaßventil der Brennkraftmaschine ein der Abgas-Nachbehandlungsvorrichtung zugeordnetes zu- oder abschaltbares Brennraum-Auslaßventil vorgesehen ist. Vorteilhafte Aus- und Weiterbildungen der Erfindung beschreiben die Unteransprüche.The object of the invention is therefore to show a more reliable way of switching an exhaust gas aftertreatment device on or off. To achieve this object, it is provided that in addition to at least one main exhaust valve of the internal combustion engine which does not act on the switchable exhaust gas aftertreatment device, a combustible exhaust valve associated with the exhaust gas aftertreatment device is provided. Advantageous further developments of the invention describe the subclaims.

Der Brennraum der Brennkraftmaschine weist somit zumindest ein Haupt-Auslaßventil auf, das in bekannter Weise insbesondere von einem Nocken betätigt wird und den Weg in einen Abgaskanal freigibt, der einen Bypass zur zuschaltbaren Abgas-Nachbehandlungsvorrichtung, d. h. insbesondere zu einem Startkatalysator, bildet. Selbstverständlich kann analog der oben genannten Schrift in einer gewissen Entfernung von der Brennkraftmaschine ein stets von Abgasen beaufschlagter Haupt-Katalysator vorgesehen sein, zu dem auch der Abgaskanal des Haupt-Auslaßventiles führt. Neben dem Haupt-Auslaßventil ist der Brennraum der Brennkraftmaschine jedoch mit einem weiteren zu- oder abschaltbaren Auslaßventil versehen, dessen Abgaskanal in der zuschaltbaren Abgas-Nachbehandlungsvorrichtung mündet und das wiederum von einem Nocken betätigt werden kann. Die zuschaltbare Abgas-Nachbehandlungsvorrichtung kann dabei ihrerseits analog der oben genannten Schrift wieder mit dem Haupt-Katalysator verbunden sein.The combustion chamber of the internal combustion engine thus has at least one main exhaust valve, which is actuated in a known manner, in particular by a cam, and clears the way into an exhaust gas duct, which bypasses the switchable exhaust gas aftertreatment device, ie. H. in particular to form a starting catalyst. Of course, analogous to the above-mentioned document, a main catalytic converter, which is always acted upon by exhaust gases, can be provided at a certain distance from the internal combustion engine, to which the exhaust gas duct of the main exhaust valve also leads. In addition to the main exhaust valve, the combustion chamber of the internal combustion engine is, however, provided with an additional exhaust valve which can be switched on or off, the exhaust gas channel of which opens into the exhaust gas aftertreatment device which can be activated and which in turn can be actuated by a cam. The switchable exhaust gas aftertreatment device can in turn be connected to the main catalytic converter in a manner analogous to that mentioned above.

Bevorzugt werden sowohl das bzw. die Haupt-Auslaßventil(e) als auch das zuschaltbare Auslaßventil unter Zwischenschaltung geeigneter bzw. bekannter Betätigungselemente von einem rotierenden Nocken betätigt. Dabei ist es möglich, das Betätigungselement des zuschaltbaren Auslaßventiles bedarfsweise an das stets betriebene Betätigungselement des Haupt-Auslaßventiles anzukoppeln. Es ist jedoch auch möglich, entweder das Haupt-Auslaßventil oder das der zuschaltbaren Abgas-Nachbehandlungsvorrichtung zugeordnete Auslaßventil zu betätigen. Das Zu- bzw. Abschalten der Auslaßventile kann dabei mittels geeigneter, bekannter schaltbarer Betätigungselemente, so beispielsweise mit verstellbaren Hebeln erfolgen. Bevorzugt erfolgt das Zuschalten des einen Auslaßventiles sowie das Abschalten des anderen Auslaßventiles durch Betätigung eines gemeinsamen Steuerhebels. Daneben ist die Erfindung in besonders einfacher Weise jedoch auch mit hydraulisch oder elektromagnetisch betätigten Ventilen realisierbar.Both the main outlet valve (s) and the connectable outlet valve are preferred with the interposition suitable or known actuators actuated by a rotating cam. It is possible to couple the actuating element of the switchable exhaust valve, if necessary, to the actuating element of the main exhaust valve, which is always operated. However, it is also possible to actuate either the main exhaust valve or the exhaust valve assigned to the switchable exhaust gas aftertreatment device. The outlet valves can be switched on and off by means of suitable, known switchable actuating elements, for example with adjustable levers. The connection of one exhaust valve and the switching off of the other exhaust valve are preferably carried out by actuating a common control lever. In addition, the invention can also be implemented in a particularly simple manner with hydraulically or electromagnetically actuated valves.

Im folgenden wird die Erfindung anhand eines bevorzugten Ausführungsbeispieles erläutert. Fig. 1 zeigt eine Prinzipskizze, Fig. 2 eine beispielhafte Betätigungsvorrichtung für die Auslaßventile.In the following the invention will be explained with reference to a preferred embodiment. Fig. 1 shows a schematic diagram, Fig. 2 shows an exemplary actuator for the exhaust valves.

Im Zylinderkopf 1 einer mehrzylindrigen Brennkraftmaschine sind Brennräume 2 vorgesehen, die Einlaßventile 3a, 3b sowie Auslaßventile 4a, 4b aufweisen. Über den Einlaßventilen 3a, 3b vorgelagerte Einlaßkanäle 5a, 5b gelangt bei geöffneten Einlaßventilen Frischgas in den Brennraum 2, das nach erfolgter Verbrennung bei geöffneten Auslaßventilen 4a, 4b über die Auslaßkanäle 6a, 6b in die Umgebung abgeführt wird.Combustion chambers 2 are provided in the cylinder head 1 of a multi-cylinder internal combustion engine, which have intake valves 3a, 3b and exhaust valves 4a, 4b. When the intake valves are open, fresh gas enters the combustion chamber 2 via the intake valves 3 a, 3 b upstream and, after combustion has taken place, is discharged to the environment via the exhaust channels 6 a, 6 b with the exhaust valves 4 a, 4 b open.

Die Auslaßkanäle 6a setzen sich in Auslaßleitungen fort, die zu einer Abgasleitung 7 zusammengeführt sind. In dieser Abgasleitung 7 ist ein Haupt-Katalysator 8 vorgesehen. Stromauf dieses Haupt-Katalysators 8 münden in die Abgasleitung 7 die die Fortsetzung der Auslaßkanäle 6b bildenden Auslaßleitungen. In diesen Auslaßkanälen 6b bzw. in den sich daran anschließenden Auslaßleitungen ist jeweils eine zuschaltbare Abgas-Nachbehandlungsvorrichtung 9 in Form eines Start-Katalysators vorgesehen.The outlet channels 6a continue in outlet lines which are brought together to form an exhaust gas line 7. A main catalytic converter 8 is provided in this exhaust pipe 7. Upstream of this main catalytic converter 8, the continuation of the outlet channels 6b open into the exhaust gas line 7 forming outlet lines. A switchable exhaust gas aftertreatment device 9 in the form of a starting catalytic converter is provided in each of these outlet channels 6b or in the outlet lines connected to them.

Die zur Abgasnachbehandlung vorgesehenen Katalysatoren benötigen für eine erfolgreiche Schadstoffkonvertierung eine gewisse Betriebstemperatur. Diese Betriebstemperatur erreichen die Katalysatoren nach einem Kaltstart der Brennkraftmaschine umso schneller, je näher sie am Brennraum 2 angeordnet sind. Bei vollständig erwärmter Brennkraftmaschine hingegen dürfen die Abgaskatalysatoren nur mit zumindest geringfügig abgekühltem Abgas beaufschlagt werden, um Überhitzungsschäden zu vermeiden.The catalytic converters intended for exhaust gas aftertreatment require a certain operating temperature for successful pollutant conversion. After a cold start of the internal combustion engine, the catalytic converters reach this operating temperature the faster the closer they are to the combustion chamber 2. In contrast, when the internal combustion engine is completely heated, the exhaust gas catalytic converters may only be subjected to exhaust gas which has cooled at least slightly in order to avoid damage caused by overheating.

Unter Berücksichtigung dieser Anforderungen sind die Auslaßventile 4b, stromab derer die Startkatalysatoren 9 vorgesehen sind, zu- bzw. abschaltbar. In der Brennkraftmaschinen-Warmlaufphase werden diese schaltbaren Auslaßventile 4b somit wie bekannt geöffnet, so daß in den zuschaltbaren Abgas-Nachbehandlungsvorrichtungen 9 kurzfristig eine erfolgreiche Schadstoffkonvertierung erfolgen kann. Bei Dauerbetrieb der betriebswarmen Brennkraftmaschine hingegen bleiben diese schaltbaren Auslaßventile 4b geschlossen, so daß das Abgas dann lediglich über den bereits gegen Ende der Warmlaufphase erwärmten Haupt-Katalysator 8 geführt wird. Solange das schaltbare Auslaßventil 4b in Betrieb ist, kann das Haupt-Auslaßventil 4a außer Betrieb gesetzt sein; dann werden die Abgase vollständig über die zuschaltbare Abgas-Nachbehandlungsvorrichtung 9 geführt. Alternativ ist es jedoch auch möglich, das Haupt-Auslaßventil 4a auch während der Brennkraftmaschinen-Warmlaufphase zu betreiben, so daß dann lediglich ein Teil des Abgasstromes durch die Start-Katalysatoren gelangt.Taking these requirements into account, the exhaust valves 4b, downstream of which the starting catalytic converters 9 are provided, can be switched on and off. In the internal combustion engine warm-up phase, these switchable exhaust valves 4b are thus opened as is known, so that a successful conversion of pollutants can take place in the switchable exhaust gas aftertreatment devices 9. During continuous operation of the warm internal combustion engine, on the other hand, these switchable exhaust valves 4b remain closed, so that the exhaust gas is then only guided over the main catalytic converter 8, which has already been heated towards the end of the warm-up phase. As long as the switchable exhaust valve 4b is in operation, the main exhaust valve 4a can be deactivated; then the exhaust gases are passed completely over the switchable exhaust gas aftertreatment device 9. Alternatively, however, it is also possible to operate the main exhaust valve 4a even during the engine warm-up phase, so that only part of the exhaust gas flow then passes through the start catalysts.

Wie ersichtlich, ist es aufgrund der Zu- bzw. Abschaltung der Start-Katalysatoren 9 mit Hilfe der schaltbaren Auslaßventile 4b möglich, diese zuschaltbaren Abgas-Nachbehandlungsvorrichtungen 9 äußerst nahe am Brennraum 2 anzuordnen. Hierbei bietet sich nicht nur eine direkt am Zylinderkopf 1 angrenzende Anordnung an, sondern es ist darüber hinaus sogar möglich, den Start-Katalysator 9 direkt im Zylinderkopf 1 vorzusehen. Dies ist einer schnellen Erwärmung der zuschaltbaren Abgas-Nachbehandlungsvorrichtung 9 besonders förderlich.As can be seen, it is possible due to the activation or deactivation of the starting catalytic converters 9 using the switchable exhaust valves 4b to arrange these switchable exhaust gas aftertreatment devices 9 extremely close to the combustion chamber 2. Not only is there an arrangement directly adjacent to the cylinder head 1, but it is even possible to provide the starting catalytic converter 9 directly in the cylinder head 1. This is particularly conducive to rapid heating of the switchable exhaust gas aftertreatment device 9.

Ein Ausführungsbeispiel für die Zu- bzw. Abschaltung der Auslaßventile 4a, 4b zeigt Fig. 2. Betätigt werden diese geringfügig versetzt hintereinander angeordneten Auslaßventile 4a, 4b von zwei Nocken 10a, 10b einer Nockenwelle, die über Schlepphebel 11a, 11b auf Tassenstößel 12a, 12b einwirken, die auf den Schäften der Auslaßventile 4a, 4b aufliegen. An den beiden Schlepphebeln 11a, 11b greift ein um die Achse 13 verschwenkbarer Steuerhebel 14 an. Die Schlepphebel 11a, 11b sind mit ihrer den Nocken 10a, 10b zugewandten Fläche so geformt, daß in der gezeigten Position des Steuerhebels 14 lediglich der vorne liegende Schlepphebel 11a in der Lage ist, den Hub des Nockens 10a auf das Auslaßventil 4a zu übertragen. Wird hingegen der Steuerhebel 14 entsprechend der Pfeilrichtung um einen definierten Winkel verschwenkt, so kann lediglich der hinten liegende Schlepphebel 11b den Hubverlauf des Nockens 10b auf den Tassenstößel 12b und somit auf das Auslaßventil 4b übertragen. In gewünschter Weise ist es somit möglich, entweder das Haupt-Auslaßventil 4a oder das schaltbare Auslaßventil 4b zu betätigen. Dabei sind jedoch auch andere Gestaltungen, Anordnungen oder Schaltprinzipien möglich, die unter den Inhalt der Patentansprüche fallen.An exemplary embodiment for the connection or disconnection of the outlet valves 4a, 4b is shown in FIG act on the shafts of the exhaust valves 4a, 4b. A control lever 14 pivotable about the axis 13 acts on the two rocker arms 11a, 11b. The rocker arms 11a, 11b are shaped with their surface facing the cams 10a, 10b so that, in the position of the control lever 14 shown, only the front rocker arm 11a is able to transmit the stroke of the cam 10a to the exhaust valve 4a. If, on the other hand, the control lever 14 is pivoted by a defined angle in accordance with the direction of the arrow, only the rocker arm 11b located at the rear can transmit the stroke profile of the cam 10b to the bucket tappet 12b and thus to the outlet valve 4b. In the desired manner, it is thus possible to actuate either the main exhaust valve 4a or the switchable exhaust valve 4b. However, other designs, arrangements or switching principles are also possible, which fall under the content of the claims.

Claims (3)

Brennkraftmaschine mit einer stromab eines Brennraum-Auslaßventiles vorgesehenen zu- oder abschaltbaren Abgas-Nachbehandlungsvorrichtung (9),
dadurch gekennzeichnet, daß neben zumindest einem die zuschaltbare Abgas-Nachbehandlungsvorrichtung (9) nicht beaufschlagenden Haupt-Auslaßventil (4a) ein der Abgas-Nachbehandlungsvorrichtung (9) zugeordnetes zu- oder abschaltbares Auslaßventil (4b) vorgesehen ist.Internal combustion engine with an exhaust gas aftertreatment device (9) which can be switched on or off downstream of a combustion chamber exhaust valve,
characterized in that in addition to at least one main exhaust valve (4a) which does not act on the switchable exhaust gas aftertreatment device (9), an exhaust valve (4b) which can be switched on or off is assigned to the exhaust gas aftertreatment device (9). Brennkraftmaschine nach Anspruch 1,
dadurch gekennzeichnet, daß ein Betätigungselement für das zuschaltbare Auslaßventil (4b) an ein Betätigungselement des Haupt-Auslaßventiles (4a) ankoppelbar ist.Internal combustion engine according to claim 1,
characterized in that an actuating element for the switchable exhaust valve (4b) can be coupled to an actuating element of the main exhaust valve (4a). Brennkraftmaschine nach Anspruch 1,
dadurch gekennzeichnet, daß das der Abgas-Nachbehandlungsvorrichtung (9) zugeordnete Auslaßventil (4b) und das Haupt-Auslaßventil (4a) von gemeinsam verstellbaren Hebeln (11a, 11b) betätigt werden.Internal combustion engine according to claim 1,
characterized in that the exhaust valve (4b) associated with the exhaust gas aftertreatment device (9) and the main exhaust valve (4a) are actuated by levers (11a, 11b) which can be adjusted together.
EP92106322A 1991-05-31 1992-04-11 Internal combustion engine with an exhaust gas post-treatment device Withdrawn EP0515814A1 (en)

Applications Claiming Priority (2)

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DE19914117874 DE4117874A1 (en) 1991-05-31 1991-05-31 INTERNAL COMBUSTION ENGINE WITH AN EXHAUST GAS TREATMENT DEVICE
DE4117874 1991-05-31

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EP0653551A2 (en) * 1993-11-16 1995-05-17 Tickford Limited Catalyst system for internal combustion engine
WO2013068640A1 (en) * 2011-11-08 2013-05-16 Wärtsilä Finland Oy Arrangement for reducing fuel material slip to the atmosphere in an internal combustion piston engine and method of upgrading an internal combustion piston engine
WO2013068639A3 (en) * 2011-11-08 2013-12-27 Wärtsilä Finland Oy Device and method for reducing fuel material slip to the atmosphere in an|internal combustion piston engine, cylinder head for an internal combustion|piston engine

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DE4344277A1 (en) * 1993-12-23 1995-06-29 Bayerische Motoren Werke Ag IC engine with primary catalytic converter
DE4442456A1 (en) * 1994-11-29 1996-05-30 Bayerische Motoren Werke Ag I.c. engine with starting catalyser
DE19904314A1 (en) * 1999-01-28 2000-08-17 Porsche Ag Exhaust gas purifying device has a catalyst arrangement consisting of a main catalyst and several pre-catalysts arranged relatively near to the cylinder head
DE102009020118B3 (en) * 2009-05-06 2010-07-22 Audi Ag Method for verifying sealability of selected exhaust valve of selected cylinder in internal combustion engine in motor vehicle, involves concluding sealability of valve based on measured values of lambda sensor in one of exhaust gas strands
DE102009020120B3 (en) * 2009-05-06 2010-10-07 Audi Ag Method for obtaining information over impact of individually selected cylinder in internal combustion engine of motor vehicle, involves determining exhaust gas delivery of selected cylinder depending on measuring result of lambda sensor

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0653551A2 (en) * 1993-11-16 1995-05-17 Tickford Limited Catalyst system for internal combustion engine
EP0653551A3 (en) * 1993-11-16 1995-08-02 Tickford Ltd Catalyst system for internal combustion engine.
WO2013068640A1 (en) * 2011-11-08 2013-05-16 Wärtsilä Finland Oy Arrangement for reducing fuel material slip to the atmosphere in an internal combustion piston engine and method of upgrading an internal combustion piston engine
WO2013068639A3 (en) * 2011-11-08 2013-12-27 Wärtsilä Finland Oy Device and method for reducing fuel material slip to the atmosphere in an|internal combustion piston engine, cylinder head for an internal combustion|piston engine
CN104040140A (en) * 2011-11-08 2014-09-10 瓦锡兰芬兰有限公司 Arrangement for reducing fuel material slip to the atmosphere in an internal combustion piston engine and method of upgrading an internal combustion piston engine

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