EP0971103B1 - Selbstzündende Brennkraftmaschine mit einer Einrichtung zum Nachbehandeln von Abgasen - Google Patents
Selbstzündende Brennkraftmaschine mit einer Einrichtung zum Nachbehandeln von Abgasen Download PDFInfo
- Publication number
- EP0971103B1 EP0971103B1 EP99112535A EP99112535A EP0971103B1 EP 0971103 B1 EP0971103 B1 EP 0971103B1 EP 99112535 A EP99112535 A EP 99112535A EP 99112535 A EP99112535 A EP 99112535A EP 0971103 B1 EP0971103 B1 EP 0971103B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- exhaust
- internal combustion
- combustion engine
- exhaust gas
- 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.)
- Expired - Lifetime
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Images
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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
-
- 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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—Nitrogen oxides
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
Definitions
- the invention relates to an internal combustion engine with a device for aftertreatment of exhaust gases according to the preamble of claim 1.
- Such an internal combustion engine is EP 0 488 386.
- This known internal combustion engine is to reduce the harmful components of the exhaust gas in the exhaust system on a ceolytic basis built catalyst provided, which under certain Conditions the NOx components in the exhaust gas flow bind and when adding a reducing agent can reduce to less harmful substances.
- a reducing agent hydrocarbons e.g. B. also the diesel fuel used for engine operation to use.
- EP 0 708 230 it is known to be a reduction catalyst Fuel in a metered amount over one externally heated evaporator directly as a reducing agent supply. By heating the fuel in the evaporator can achieve a good reaction in the catalyst become. However, the effort and energy consumption considerably for an externally heated evaporator.
- a porous hollow body is proposed as an evaporator, there is also a risk of the pores becoming clogged after a long time Business.
- EP 0 621 400 it is also known to have a metered Amount of diesel fuel as a reducing agent for an exhaust gas aftertreatment device by post-injection by means of those intended for engine combustion Insert the injector into the combustion chamber, at a time when the combustion of the fuel injected by the primary injection is almost or completely completed.
- Such Measure is technical but only with a complex Control of the injection characteristic, e.g. B. by means of a Common rail injection system - as with EP 0 784 738 suggested - feasible.
- JP-A-06074022 is an exhaust gas purification system for a multi-cylinder internal combustion engine with an internal one Combustion described, in addition to an exhaust gas recirculation device a device for introducing fuel in the exhaust gas to the NOx components in the Exhaust gas through reduction in a reduction catalytic converter eliminate.
- a device for introducing fuel in the exhaust gas is an injection nozzle on a branch pipe of the exhaust manifold intended.
- the reduction catalyst is located downstream of the exhaust manifold. That through the branch pipe flowing exhaust gas can reduce the amount of fuel injected take to the reduction catalyst where it is under the conditions of the catalyst with the NOx components should react. Measures that crack a Secure fuel before reaching the catalytic converter, are however not recognizable, so that when cleaning the exhaust gas solely on the effect of the catalyst is. The regeneration of a storage catalytic converter can thus not or only insufficiently achieved.
- the invention has for its object a Internal combustion engine in the preamble of the claim 1 type to create, with relative simple technique a cracking of the as a reducing agent for NOx reduction for the regeneration of a NOx storage catalytic converter fuel supplied in all Operating areas of the internal combustion engine is possible.
- the internal combustion engine has an injection nozzle for injection of fuel as a reducing agent; in the general it is used for the provision of reducing agents be sufficient just on a cylinder or on to provide such additional injectors in some cylinders, so the technical effort for deployment an optimally processing reducing agent remains low.
- a particularly intimate mixture of hot Exhaust gas and injected as well as effectively cracked Diesel fuel is achieved when the fuel is considered thin jet directly into the one released by the exhaust valve Opening in the direction of the exhaust gas Combustion chamber of the respective cylinder is injected.
- FIG. 1 The only figure of the drawing shows in a more schematic Form a self-igniting internal combustion engine.
- a piston 2 is guided over a connecting rod 3 connected to a crankshaft 4 is.
- the cylinder 1 is up with a cylinder head closed, in which an inlet channel 5 and an outlet channel 6 are arranged with one over the piston 2 located combustion chamber 7 are connected.
- the inlet duct 5 is by means of an inlet valve 8 and the outlet channel 6 controllable by means of an outlet valve 9.
- intake valve 8 and exhaust valve 9 are in a known manner operated with a camshaft (not shown).
- On the exhaust duct 6 closes with an exhaust system NOx storage catalyst 10 on.
- In the cylinder head is in the middle a fuel injector 11 is arranged.
- a fuel injection pump 12 delivers through an injection line 13 Fuel under pressure to the fuel injector 11.
- an injection nozzle 14 arranged so that its jet 15 to that of the exhaust valve 9 directed towards the combustion chamber 7 towards opening 16 is.
- the injection nozzle 14 is via a pressure line 17th supplied with fuel under pressure.
- the injector 14 is connected by means of a control line 18 with an electronic control unit 19.
- the control unit 19 is via lines 20, 21, 22 from sensors 23, 24, 25 with signals of operating parameters of the internal combustion engine supplied, such as B. the operational load, the Speed and the catalyst condition.
- the storage catalytic converter 10 is another in the course of the exhaust system downstream Catalyst (not shown) connected downstream.
- the control unit 19 When operating a self-igniting internal combustion engine, especially one with direct injection, store the resulting NOx components of the exhaust gas accumulate on the storage catalytic converter 10 and are stored as long as until it is recognized by the control unit 19 that regeneration of the storage catalytic converter 10 by reduction of the stored NOx components is required.
- the control unit 19 causes the Injector 14 over a short period of fuel in measured Amount as a reducing agent in the hot exhaust gas flow at the opening just released by the outlet valve 9 16 of the outlet channel 6 in a thin jet 15 counter the direction of the exhaust gas flow is injected.
- This Fuel is not in the low-oxygen exhaust gas burn, but by heat and in the exhaust gas Radicals at least partially in short reactive parts of the molecule cracked and completely evaporated.
- the fuel pretreated in this way comes together with the exhaust gas in the storage catalytic converter 10 and acts in this as a reducing agent for the accumulated NOx components. Reactions form in the storage catalytic converter 10 between the NOx molecules and the highly reactive hydrocarbon fragments of the cracked fuel what to reduce the NOx molecules in nitrogen and oxygen leads. Remaining proportions of hydrocarbons and carbon monoxide are in the downstream further catalyst converted to harmless components.
- the particular advantage of the invention is in it to see that with relatively simple technical means, which also on a previously without storage catalytic converter and with usual injection working diesel engine can be retrofitted, a highly effective treatment of diesel fuel to a reducing agent.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Description
Claims (5)
- Selbstzündende Brennkraftmaschine mit einer Einrichtung zum Nachbehandeln von Abgasen, mit mindestens einem Zylinder (1) und einem darin beweglich geführten Kolben (2), einem über dem Kolben (2) befindlichen Verbrennungsraum (7) mit mindestens einem Einlassventil (8) und einem Auslassventil (9), einen zum Einlassventil (8) führenden Einlasskanal (5) und einen vom Auslassventil (9) zu einem Abgassystem führenden Auslasskanal (6), einem im Abgassystem angeordneten Speicherkatalysator (10) zum Speichern von NOx-Bestandteilen des Abgases, mit einer ersten Einrichtung (11, 12, 13) zum dosierten Einspritzen von Kraftstoff in den Verbrennungsraum (7) sowie einer zweiten von einer Einspritzdüse (14) und einem Zumess-System gebildeten Einrichtung zum dosierten Einbringen von Kraftstoff als Reduktionsmittel in den Strom des dem Speicherkatalysator zugeführten Abgases in Abhängigkeit von Betriebsparametern der Brennkraftmaschine sowie des Speicherkatalysators (10) zur Regenerierung des Speicherkatalysators, dadurch gekennzeichnet, dass zum Kracken von Kraftstoff die Einspritzdüse (14) der zweiten Einrichtung den zugemessenen Kraftstoff entgegen dem Abgasstrom in den unmittelbaren Bereich zumindest eines sich nach einem Arbeitsspiel der Brennkraftmaschine öffnenden Auslassventils (9) spritzt.
- Selbstzündende Brennkraftmaschine nach Anspruch 1 dadurch gekennzeichnet, daß an jedem Zylinder (1) der Brennkraftmaschine eine Einspritzdüse (14) zum Einspritzen von Kraftstoff in dem Bereich eines sich nach einem Arbeitsspiel der Brennkraftmaschine öffnenden Auslaßventils (16) vorgesehen ist.
- Selbstzündende Brennkraffmaschinen nach Anspruch 1, dadurch gekennzeichnet, daß jeweils für eine Gruppe von Zylindern (1) eine Einspritzdüse (14) zum Einspritzen von Kraftstoff in den Bereich eines sich nach einem Arbeitsspiel der Brennkraftmaschine öffnenden Auslaßventils (9) vorgesehen ist.
- Selbstzündende Brennkraftmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Einspritzdüse (14) der zweiten Einrichtung den zugemessenen Kraftstoff durch die von einem Auslaßventil (9) nach einem Arbeitsspiel der Brennkraftmaschine freigegebene Öffnung (16) entgegen dem ausströmenden Abgas in den Brennraum (7) des jeweiligen Zylinders (1) spritzt.
- Selbstzündende Brennkraftmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Kraftstoff der zweiten Einrichtung als dünner Strahl eingespritzt wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19830275A DE19830275A1 (de) | 1998-07-07 | 1998-07-07 | Selbstzündende Brennkraftmaschine mit einer Einrichtung zum Nachbehandeln von Abgasen |
DE19830275 | 1998-07-07 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0971103A1 EP0971103A1 (de) | 2000-01-12 |
EP0971103B1 true EP0971103B1 (de) | 2002-11-20 |
Family
ID=7873201
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99112535A Expired - Lifetime EP0971103B1 (de) | 1998-07-07 | 1999-07-01 | Selbstzündende Brennkraftmaschine mit einer Einrichtung zum Nachbehandeln von Abgasen |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0971103B1 (de) |
DE (2) | DE19830275A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10150267A1 (de) * | 2001-10-11 | 2003-04-30 | Opel Adam Ag | Verfahren zum Betrieb eines SCR-Katalysators im Abgastrakt einer Brennkraftmaschine |
FR2927656A3 (fr) * | 2008-02-20 | 2009-08-21 | Renault Sas | Dispositif et procede de regeneration d'un filtre a particules |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61116013A (ja) * | 1984-11-09 | 1986-06-03 | Mitsubishi Motors Corp | デイ−ゼルパテイキユレ−トオキシダイザの再生装置 |
JP3206678B2 (ja) * | 1992-08-26 | 2001-09-10 | いすゞ自動車株式会社 | 内燃機関の排気ガス浄化装置 |
DE4436415A1 (de) * | 1994-10-12 | 1996-04-18 | Bosch Gmbh Robert | Einrichtung zum Nachbehandeln von Abgasen einer selbstzündenden Brennkraftmaschine |
DE19646643C1 (de) * | 1996-11-12 | 1998-02-12 | Daimler Benz Ag | Anlage zur Stickoxid-Reduktionsmitteleinspritzung in einen Abgasstrom |
-
1998
- 1998-07-07 DE DE19830275A patent/DE19830275A1/de not_active Withdrawn
-
1999
- 1999-07-01 DE DE59903446T patent/DE59903446D1/de not_active Expired - Lifetime
- 1999-07-01 EP EP99112535A patent/EP0971103B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE19830275A1 (de) | 2000-01-13 |
DE59903446D1 (de) | 2003-01-02 |
EP0971103A1 (de) | 2000-01-12 |
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