EP3701131A1 - Internal combustion engine with an exhaust gas system - Google Patents

Internal combustion engine with an exhaust gas system

Info

Publication number
EP3701131A1
EP3701131A1 EP18773944.6A EP18773944A EP3701131A1 EP 3701131 A1 EP3701131 A1 EP 3701131A1 EP 18773944 A EP18773944 A EP 18773944A EP 3701131 A1 EP3701131 A1 EP 3701131A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
exhaust
internal combustion
combustion engine
bypass
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Withdrawn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
EP18773944.6A
Other languages
German (de)
French (fr)
Inventor
Stephan Rubbert
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke 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
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP3701131A1 publication Critical patent/EP3701131A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—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
    • 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
    • F01N13/001—Gas flow channels or gas chambers being at least partly formed in the structural parts of the engine or machine
    • 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
    • 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
    • F01N3/101—Three-way catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/36—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an exhaust flap
    • 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
    • F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
    • F01N2340/02—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses characterised by the distance of the apparatus to the engine, or the distance between two exhaust treating apparatuses
    • 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
    • F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
    • F01N2340/06—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses characterised by the arrangement of the exhaust apparatus relative to the turbine of a turbocharger
    • 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
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • F01N2410/02—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device in case of high temperature, e.g. overheating of catalytic reactor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to an internal combustion engine having an exhaust system with the features of the preamble of patent claim 1.
  • German Offenlegungsschrift DE 2851675 A1 discloses an afterburning device for the exhaust gases of internal combustion engines.
  • the invention relates to a device for post-combustion of exhaust gases in internal combustion engines with a catalyst for the oxidation of CO and HC, in which a portion of the exhaust gas is passed in the upper load range, bypassing a catalyst through an exhaust passage, which is characterized in that the catalyst and the exhaust passage downstream of a second catalyst.
  • the fuel-air mixture is enriched (lambda ⁇ 1) at high engine speeds and high power in order to protect the exhaust gas-carrying components from thermal overload. This is especially true for supercharged engines where the
  • the mixture enrichment leads to high CO concentrations in the exhaust gas and the CO is not oxidized in the catalyst due to the lack of oxygen.
  • the catalyst no longer works as a 3-way catalyst because no Stoichiometric mixture is adjusted. This endangers the fulfillment of future approval requirements for motor vehicles.
  • Object of the present invention is to show an alternative exhaust system to solve the CO problem.
  • Part of the exhaust flow may be through a in the exhaust manifold
  • the wastegate regulates the bypass exhaust gas flow and thus advantageously replaces the wastegate in the turbocharger.
  • the bypass exhaust gas stream lowers the exhaust gas temperature in the exhaust gas turbine and in the exhaust gas cleaning system close to the engine.
  • the exhaust gas in the bypass exhaust gas stream is purified by the engine, which is remote from the engine, the second exhaust gas purification system.
  • the bypass is only in the thermally critical high load range of
  • Emission control system the catalyst close to the engine, cleaned.
  • the exhaust gas bypass, the entire exhaust system is thermally relieved and the mixture enrichment can be omitted in an advantageous manner.
  • the exhaust gas is cleaned in the entire operating range of the internal combustion engine and it can also be met sharper exhaust emission laws.
  • the wastegate, the closure element in the exhaust manifold or cylinder head it may, for. B. with a water-cooled Valve seat executed and the acoustic disadvantages of wastegate in the turbocharger are avoided.
  • Figure 1 shows schematically an internal combustion engine with a
  • Figure 1 shows schematically an internal combustion engine 1 with an exhaust system 2.
  • the exhaust system 2 is connected via a not quantified exhaust manifold with the engine exhaust leading.
  • Embodiment flows the exhaust gas at low load or during warm-up of the internal combustion engine first via a turbine 7 of a
  • Tailpipes 9 Outflowing exhaust gas is represented symbolically by two arrows.
  • the first exhaust pipe 10 can often be omitted, since the first emission control system 3 often directly to a turbine housing of the
  • Exhaust gas turbocharger is flanged.
  • the turbine wheel 7 is rotatably mounted in a housing of the exhaust gas turbocharger and drives a compressor, not shown, of the exhaust gas turbocharger. Between the internal combustion engine 1 and the turbine housing, a bypass 5 branches off from the exhaust system 2, which is behind the first
  • a closure element 6 is provided in the bypass 5.
  • the closure element 6 operates as a normal wastegate, which also takes over the wastegate.
  • the closure element 6 is opened and a portion of the exhaust gas mass flow is passed to the first emission control system 3, so that it is thermally protected.
  • the second exhaust pipe 1 1 can also be designed profiled, for a better exhaust gas cooling.
  • the closure element 6 is arranged according to the invention in a first embodiment in the exhaust manifold.
  • the closure element 6 advantageously replaces an acoustically critical bypass flap of the exhaust gas turbocharger.
  • the muffler 8 and the second emission control system 4 are arranged in a single housing, in a further embodiment, different housing for the muffler 8, the second emission control system 4 can be provided.
  • exhaust gas bypass 5 thus the entire exhaust system is thermally relieved and a mixture enrichment can be omitted.
  • the exhaust gas is cleaned in the entire operating range of the internal combustion engine 1 and it can be met even tougher exhaust emission laws.
  • the wastegate, the closure element 6, in the exhaust manifold or in the cylinder head a simple structural unit is shown by the replacement of the bypass valve in the exhaust gas turbocharger are acoustic

Landscapes

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

Abstract

The invention relates to an internal combustion engine (1) with an exhaust gas system (2) which is connected to the internal combustion engine (1) via an exhaust manifold. A first exhaust gas purification system (3) is arranged in the exhaust gas system (2), and a second exhaust gas purification system (4) is arranged in the exhaust gas system downstream of the first exhaust gas purification system in the flow direction of the exhaust gas, wherein the first exhaust gas purification system (3) can be bypassed via a bypass (5) using a closure element (6), and the closure element (6) is arranged in the exhaust manifold. The design according to the invention can be used to allow the internal combustion engine (1) to be operated at a high load with a mixture enrichment.

Description

Brennkraftmaschine mit einer Abgasanlage  Internal combustion engine with an exhaust system
Die Erfindung betrifft eine Brennkraftmaschine mit einer Abgasanlage mit den Merkmalen aus dem Oberbegriff des Patentanspruchs 1 . The invention relates to an internal combustion engine having an exhaust system with the features of the preamble of patent claim 1.
Aus der Deutschen Offenlegungsschrift DE 2851675 A1 , von der die vorliegende Erfindung ausgeht, ist eine Nachverbrennungsvorrichtung für die Abgase von Brennkraftmaschinen bekannt. Es wird eine Vorrichtung beansprucht, zum Nachverbrennen von Abgasen bei Brennkraftmaschinen mit einem Katalysator für die Oxidation von CO und HC, bei dem im oberen Lastbereich ein Teil des Abgases unter Umgehung eines Katalysators durch einen Abgaskanal geleitet wird, die dadurch gekennzeichnet ist, dass dem Katalysator und dem Abgaskanal ein zweiter Katalysator nachgeordnet ist. German Offenlegungsschrift DE 2851675 A1, from which the present invention is based, discloses an afterburning device for the exhaust gases of internal combustion engines. The invention relates to a device for post-combustion of exhaust gases in internal combustion engines with a catalyst for the oxidation of CO and HC, in which a portion of the exhaust gas is passed in the upper load range, bypassing a catalyst through an exhaust passage, which is characterized in that the catalyst and the exhaust passage downstream of a second catalyst.
Bei Ottobrennkraftmaschinen wird bei hohen Motordrehzahlen und hoher Leistung das Kraftstoff-Luft-Gemisch angereichert (Lambda < 1 ), um die abgasführenden Bauteile vor thermischer Überbeanspruchung zu schützen. Dieses gilt insbesondere für aufgeladene Motoren, bei denen die In petrol engines, the fuel-air mixture is enriched (lambda <1) at high engine speeds and high power in order to protect the exhaust gas-carrying components from thermal overload. This is especially true for supercharged engines where the
Abgasturbine und der Katalysator ansonsten durch zu hohe Exhaust gas turbine and the catalyst otherwise by too high
Abgastemperaturen zerstört würden. Exhaust gas temperatures would be destroyed.
Die Gemischanreicherung führt zu hohen CO-Konzentrationen im Abgas und das CO wird im Katalysator aufgrund des Sauerstoffmangels nicht oxidiert. Der Katalysator arbeitet nicht mehr als 3-Wege-Katalysator, weil kein stöchiometrisches Gemisch eingestellt wird. Damit wird die Erfüllung zukünftiger Zulassungsanforderung für Kraftfahrzeuge gefährdet. The mixture enrichment leads to high CO concentrations in the exhaust gas and the CO is not oxidized in the catalyst due to the lack of oxygen. The catalyst no longer works as a 3-way catalyst because no Stoichiometric mixture is adjusted. This endangers the fulfillment of future approval requirements for motor vehicles.
Aufgabe der vorliegenden Erfindung ist es, eine alternative Abgasanlage aufzuzeigen, um das CO-Problem zu lösen. Object of the present invention is to show an alternative exhaust system to solve the CO problem.
Diese Aufgabe wird durch die Merkmale im kennzeichnenden Teil des Patentanspruchs 1 gelöst. This object is solved by the features in the characterizing part of patent claim 1.
Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben. Advantageous developments of the invention are described in the subclaims.
Ein Teil des Abgasstroms kann durch ein in dem Abgaskrümmer Part of the exhaust flow may be through a in the exhaust manifold
angeordnetes Wastegate am Turbolader und an der Brennkraftmaschinen nahen, ersten Abgasreinigungsanlage vorbeigeführt und einem, arranged wastegate at the turbocharger and on the internal combustion engine near, the first exhaust gas purification system passed and a,
beispielsweise in einen Endschalldämpfer eingebauten Katalysator zugeführt werden. Das Wastegate regelt den Bypassabgasstrom und ersetzt somit in vorteilhafter Weise das Wastegate im Turbolader. Der Bypassabgasstrom senkt die Abgastemperatur in der Abgasturbine und in der motornahen Abgasreinigungsanlage. Das Abgas im Bypassabgasstrom wird durch den motorfernen Katalysator, die zweite Abgasreinigungsanlage, gereinigt. Der Bypass ist nur im thermisch kritischen Hochlastbereich der For example, be fed into a rear muffler built-in catalyst. The wastegate regulates the bypass exhaust gas flow and thus advantageously replaces the wastegate in the turbocharger. The bypass exhaust gas stream lowers the exhaust gas temperature in the exhaust gas turbine and in the exhaust gas cleaning system close to the engine. The exhaust gas in the bypass exhaust gas stream is purified by the engine, which is remote from the engine, the second exhaust gas purification system. The bypass is only in the thermally critical high load range of
Brennkraftmaschine wirksam. Im normalen Betrieb und im Warmlauf der Brennkraftmaschine wird das gesamte Abgas durch die erste Internal combustion engine effective. During normal operation and warm-up of the internal combustion engine, the entire exhaust gas through the first
Abgasreinigungsanlage, den motornahen Katalysator, gereinigt. Emission control system, the catalyst close to the engine, cleaned.
Durch den Abgasbypass wird die gesamte Abgasanlage thermisch entlastet und die Gemischanreicherung kann in vorteilhafter Weise entfallen. Damit wird das Abgas im gesamten Betriebsbereich der Brennkraftmaschine gereinigt und es können auch schärfere Abgasemissionsgesetze erfüllt werden. Durch den Einbau des Wastegates, das Verschlusselement im Abgaskrümmer oder Zylinderkopf kann es z. B. mit einem wassergekühlten Ventilsitz ausgeführt und die akustischen Nachteile des Wastegates im Turbolader vermieden werden. The exhaust gas bypass, the entire exhaust system is thermally relieved and the mixture enrichment can be omitted in an advantageous manner. Thus, the exhaust gas is cleaned in the entire operating range of the internal combustion engine and it can also be met sharper exhaust emission laws. By installing the wastegate, the closure element in the exhaust manifold or cylinder head, it may, for. B. with a water-cooled Valve seat executed and the acoustic disadvantages of wastegate in the turbocharger are avoided.
Im Folgenden ist die Erfindung anhand einer einzigen Figur näher erläutert. In the following, the invention is explained in more detail with reference to a single figure.
Figur 1 zeigt schematisch eine Brennkraftmaschine mit einer Figure 1 shows schematically an internal combustion engine with a
erfindungsgemäßen Abgasanlage. exhaust system according to the invention.
Figur 1 zeigt schematisch eine Brennkraftmaschine 1 mit einer Abgasanlage 2. Die Abgasanlage 2 ist über einen nicht bezifferten Abgaskrümmer mit der Brennkraftmaschine Abgas führend verbunden. In dem vorliegenden Figure 1 shows schematically an internal combustion engine 1 with an exhaust system 2. The exhaust system 2 is connected via a not quantified exhaust manifold with the engine exhaust leading. In the present
Ausführungsbeispiel strömt das Abgas bei niedriger Last bzw. im Warmlauf der Brennkraftmaschine zuerst über ein Turbinenrad 7 eines Embodiment flows the exhaust gas at low load or during warm-up of the internal combustion engine first via a turbine 7 of a
Abgasturboladers und weiter durch ein erstes Abgasrohr 10, dann durch eine erste Abgasreinigungsanlage 3 und weiter durch ein zweites Abgasrohr 1 1 durch einen Endschalldämpfer 8 und weiter durch eine zweite Exhaust gas turbocharger and further through a first exhaust pipe 10, then through a first exhaust gas purification system 3 and further through a second exhaust pipe 1 1 through an end muffler 8 and further through a second
Abgasreinigungsanlage 4 und verlässt die Abgasanlage 2 über zwei Emission control system 4 and leaves the exhaust system 2 via two
Endrohre 9. Ausströmendes Abgas ist durch zwei Pfeile symbolisch dargestellt. Das erste Abgasrohr 10 kann häufig entfallen, da die erste Abgasreinigungsanlage 3 häufig direkt an ein Turbinengehäuse des Tailpipes 9. Outflowing exhaust gas is represented symbolically by two arrows. The first exhaust pipe 10 can often be omitted, since the first emission control system 3 often directly to a turbine housing of the
Abgasturboladers angeflanscht wird. Exhaust gas turbocharger is flanged.
Das Turbinenrad 7 ist drehbar in einem Gehäuse des Abgasturboladers gelagert und treibt einen nicht dargestellten Verdichter des Abgasturboladers an. Zwischen der Brennkraftmaschine 1 und dem Turbinengehäuse zweigt ein Bypass 5 von der Abgasanlage 2 ab, der hinter der ersten The turbine wheel 7 is rotatably mounted in a housing of the exhaust gas turbocharger and drives a compressor, not shown, of the exhaust gas turbocharger. Between the internal combustion engine 1 and the turbine housing, a bypass 5 branches off from the exhaust system 2, which is behind the first
Abgasreinigungsanlage 3 und vor dem Endschalldämpfer 8 wieder in die Abgasanlage 2 mündet. Zur Abgas-Massenstromregelung des an der ersten Abgasreinigungsanlage 3 vorbeigeführten Abgases ist in dem Bypass 5 ein Verschlusselement 6 vorgesehen. Das Verschlusselement 6 arbeitet als normales Wastegate, das auch die Ladedruckregeleung übernimmt. Bei hohem Abgasmassenstrom, d. h. bei hoher Drehzahl und hoher Leistung der Brennkraftmaschine 1 wird das Verschlusselement 6 geöffnet und ein Teil des Abgasmassenstroms wird an der ersten Abgasreinigungsanlage 3 vorbeigeführt, so dass diese thermisch geschützt ist. In einer bevorzugten Ausführungsform kann das zweite Abgasrohr 1 1 auch profiliert ausgeführt sein, für eine bessere Abgaskühlung. Emission control system 3 and before the rear silencer 8 opens again into the exhaust system 2. For exhaust gas mass flow control of the exhaust gas passed past the first exhaust gas purification system 3, a closure element 6 is provided in the bypass 5. The closure element 6 operates as a normal wastegate, which also takes over the wastegate. At high exhaust gas mass flow, ie at high speed and high power of the internal combustion engine 1, the closure element 6 is opened and a portion of the exhaust gas mass flow is passed to the first emission control system 3, so that it is thermally protected. In a preferred embodiment, the second exhaust pipe 1 1 can also be designed profiled, for a better exhaust gas cooling.
Für möglichst geringen Bauaufwand ist das Verschlusselement 6 in einem ersten Ausführungsbeispiel erfindungsgemäß in dem Abgaskrümmer angeordnet. For the lowest possible construction costs, the closure element 6 is arranged according to the invention in a first embodiment in the exhaust manifold.
In einem zweiten Ausführungsbeispiel, welches in Figur 1 vorliegt, ersetzt das Verschlusselement 6 in vorteilhafter Weise eine akustisch kritische Bypassklappe des Abgasturboladers. In a second exemplary embodiment, which is present in FIG. 1, the closure element 6 advantageously replaces an acoustically critical bypass flap of the exhaust gas turbocharger.
In dem vorliegenden Ausführungsbeispiel sind der Schalldämpfer 8 und die zweite Abgasreinigungsanlage 4 in einem einzigen Gehäuse angeordnet, in einem weiteren Ausführungsbeispiel können auch verschiedene Gehäuse für den Schalldämpfer 8 die zweite Abgasreinigungsanlage 4 vorgesehen werden. Die erste und die zweite Abgasreinigungsanlage 3, 4, sind 3-Wege- Katalysatoren. Beide Abgasreinigungsanlagen 3, 4 arbeiten als 3-Wege- Katalysatoren, da die Brennkraftmaschine 1 mit stöchiometrischem Gemisch, ohne Anreicherung, bzw. Anfettung und ohne Sekundärluft arbeiten soll. In the present embodiment, the muffler 8 and the second emission control system 4 are arranged in a single housing, in a further embodiment, different housing for the muffler 8, the second emission control system 4 can be provided. The first and second emission control systems 3, 4, 3-way catalysts. Both emission control systems 3, 4 work as 3-way catalysts, since the internal combustion engine 1 should work with stoichiometric mixture without enrichment or enrichment and without secondary air.
Durch den Abgasbypass 5 wird somit das gesamte Abgassystem thermisch entlastet und eine Gemischanreicherung kann entfallen. Damit wird das Abgas im gesamten Betriebsbereich der Brennkraftmaschine 1 gereinigt und es können noch schärfere Abgasemissionsgesetze erfüllt werden. Durch den Einbau des Wastegates, das Verschlusselement 6, im Abgaskrümmer oder auch im Zylinderkopf, wird eine einfache bauliche Einheit dargestellt, durch den Ersatz der Bypassklappe im Abgasturbolader werden akustische By exhaust gas bypass 5 thus the entire exhaust system is thermally relieved and a mixture enrichment can be omitted. Thus, the exhaust gas is cleaned in the entire operating range of the internal combustion engine 1 and it can be met even tougher exhaust emission laws. By installing the wastegate, the closure element 6, in the exhaust manifold or in the cylinder head, a simple structural unit is shown by the replacement of the bypass valve in the exhaust gas turbocharger are acoustic
Nachteile vermieden. Disadvantages avoided.
BEZUGSZEICHENLISTE LIST OF REFERENCE NUMBERS
1 . Brennkraftmaschine 1 . Internal combustion engine
2. Abgasanlage  2nd exhaust system
3. erste Abgasreinigungsaniage 3rd first Abgasreinigungsaniage
4. zweite Abgasreinigungsaniage4. second Abgasreinigungsaniage
5. Bypass 5. Bypass
6. Verschlusselement  6. closure element
7. Turbinenrad  7. Turbine wheel
8. Schalldämpfer  8. Silencer
9. Endrohr  9. tailpipe
10. erstes Abgasrohr  10. first exhaust pipe
1 1 . zweites Abgasrohr  1 1. second exhaust pipe

Claims

PATENTANSPRÜCHE
1 . Brennkraftmaschine (1 ) mit einer Abgasanlage (2), die über einen Abgaskrümmer mit der Brennkraftmaschine (1 ) verbunden ist, wobei in der Abgasanlage (2) eine erste (3) und in Strömungsrichtung des Abgases dahinter eine zweite Abgasreinigungsanlage (4) angeordnet ist, wobei die erste Abgasreinigungsanlage (3) über einen Bypass (5) mit einem Verschlusselement (6) umgehbar ist, 1 . Internal combustion engine (1) with an exhaust system (2) which is connected via an exhaust manifold to the internal combustion engine (1), wherein in the exhaust system (2) a first (3) and in the flow direction of the exhaust behind a second emission control system (4) is arranged wherein the first emission control system (3) can be bypassed via a bypass (5) with a closure element (6),
dadurch gekennzeichnet, dass das Verschlusselement (6) in dem Abgaskrümmer angeordnet ist.  characterized in that the closure element (6) is arranged in the exhaust manifold.
2. Brennkraftmaschine mit einer Abgasanlage nach Patentanspruch 1 , dadurch gekennzeichnet, dass zwischen dem Abgaskrümmer und der ersten Abgasreinigungsanlage (3) in der Abgasanlage (2) ein 2. Internal combustion engine with an exhaust system according to claim 1, characterized in that between the exhaust manifold and the first emission control system (3) in the exhaust system (2)
Turbinengehäuse mit einem Turbinenrad (7) eines Abgasturboladers angeordnet ist, wobei das Turbinenrad (7) über den Bypass (5) umgehbar ist und eine Bypassklappe das Verschlusselement (6) ist. Turbine housing with a turbine wheel (7) of an exhaust gas turbocharger is arranged, wherein the turbine wheel (7) via the bypass (5) is bypassed and a bypass flap is the closure element (6).
3. Brennkraftmaschine mit einer Abgasanlage nach Patentanspruch 1 oder 2, 3. Internal combustion engine with an exhaust system according to claim 1 or 2,
dadurch gekennzeichnet, dass zwischen der ersten und der zweiten Abgasreinigungsanlage (3, 4) ein Schalldämpfer (8) in der Abgasanlage (2) angeordnet ist.  characterized in that between the first and the second emission control system (3, 4) a muffler (8) in the exhaust system (2) is arranged.
EP18773944.6A 2017-10-23 2018-09-06 Internal combustion engine with an exhaust gas system Withdrawn EP3701131A1 (en)

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DE102017218837.5A DE102017218837A1 (en) 2017-10-23 2017-10-23 Internal combustion engine with an exhaust system
PCT/EP2018/073954 WO2019081111A1 (en) 2017-10-23 2018-09-06 Internal combustion engine with an exhaust gas system

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DE102018205768B3 (en) 2018-04-17 2019-01-10 Bayerische Motoren Werke Aktiengesellschaft Internal combustion engine with an exhaust system
DE102018205771A1 (en) 2018-04-17 2019-10-17 Bayerische Motoren Werke Aktiengesellschaft Internal combustion engine with an exhaust system
DE102018205770A1 (en) 2018-04-17 2019-10-17 Bayerische Motoren Werke Aktiengesellschaft Internal combustion engine with an exhaust system
JP2023091576A (en) * 2021-12-20 2023-06-30 トヨタ自動車株式会社 Engine control device

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