EP2761147A1 - Combustion assembly having an internal combustion engine and an exhaust channel and method for the exhaust treatment of an internal combustion engine - Google Patents

Combustion assembly having an internal combustion engine and an exhaust channel and method for the exhaust treatment of an internal combustion engine

Info

Publication number
EP2761147A1
EP2761147A1 EP20120746083 EP12746083A EP2761147A1 EP 2761147 A1 EP2761147 A1 EP 2761147A1 EP 20120746083 EP20120746083 EP 20120746083 EP 12746083 A EP12746083 A EP 12746083A EP 2761147 A1 EP2761147 A1 EP 2761147A1
Authority
EP
Grant status
Application
Patent type
Prior art keywords
crankcase
exhaust
internal combustion
combustion engine
piston
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.)
Granted
Application number
EP20120746083
Other languages
German (de)
French (fr)
Other versions
EP2761147B1 (en )
Inventor
Stefan Loesch
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust 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
    • F01N3/24Exhaust 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 constructional aspects of converting apparatus
    • F01N3/30Arrangements for supply of additional air
    • F01N3/32Arrangements for supply of additional air using air pump
    • F01N3/326Engine-driven air pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust 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
    • F01N3/18Exhaust 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
    • F01N3/20Exhaust 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
    • F01N3/206Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B33/00Engines characterised by provision of pumps for charging or scavenging
    • F02B33/02Engines with reciprocating-piston pumps; Engines with crankcase pumps
    • F02B33/04Engines with reciprocating-piston pumps; Engines with crankcase pumps with simple crankcase pumps, i.e. with the rear face of a non-stepped working piston acting as sole pumping member in co-operation with the crankcase
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2270/00Mixing air with exhaust gases
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases

Abstract

The invention relates to a combustion assembly having an internal combustion engine (10) and an exhaust system (50) connected to the internal combustion engine (10) and to a method for the exhaust treatment of an internal combustion engine (10), wherein the exhaust system (50) has an exhaust channel (51) for expelling an exhaust of the internal combustion engine (10) and a device for treating the exhaust. The internal combustion engine (10) has a combustion chamber (15) which is limited by a piston (20). The piston (20) borders a crankcase (30) on a side facing away from the combustion chamber (15). The crankcase (30) is configured so that, as a consequence of a movement of the piston (20), a gas, in particular air, is compressed in the crankcase (30). The crankcase (30) is connected to the exhaust system (50) so that the gas compressed in the crankcase (30) is supplied to the exhaust system (50).

Description

Description Title

Combustion arrangement with an internal combustion engine and an exhaust passage, and exhaust gas treatment method for an internal combustion engine

State of the art

The invention relates to a combustion apparatus with an internal combustion engine and an exhaust system and a method for exhaust gas aftertreatment of an internal combustion engine according to the preamble of the independent claims.

Internal combustion engines due to the increasingly stringent emission standards, emissions of harmful exhaust gas components such as soot, unburned hydrocarbon compounds or nitrogen oxides must be reduced further. Called SCR catalysts for removing nitrogen oxides especially in diesel engines, for the selective catalytic reduction of nitrogen oxides used. From DE 199 61 947 an exhaust aftertreatment system for an internal combustion engine is already known, in which a liquid reducing agent from a feed pump into a mixing chamber is promoted. In the mixing chamber is an aerosol by means of compressed air from the liquid reducing agent is produced, and this metered aerosol via an aerosol line in the exhaust passage of the internal combustion engine. Further, for the regeneration of a particulate filter, a regeneration means is known from DE 10 2005 034 704, to introduce into the exhaust passage. From DE 69522311 it is known to use a crankcase of an internal combustion engine for compressing air and supplying this compressed air to the power increase an intake passage of the engine.

epiphany

In contrast, the combustion arrangement according to the invention and the inventive method for exhaust aftertreatment of an internal combustion engine having the features of the independent claims have the movement of the piston is used to compress a gas, in particular air in the crankcase and supplying this compressed gas of the exhaust system the advantage wherein by the compression of the gas in the crankcase can be dispensed by the piston of the internal combustion engine to an external power supply device for the gas, for example an accumulator or an additional air compressor. Thus, a supply of the compressed gas to the exhaust system without additional components and thus can be realized very inexpensively.

By the provisions recited in the dependent claims, advantageous refinements and improvements of the combustion arrangement and the specified method are possible.

An advantageous further development is that the piston is movably disposed in a cylinder, the piston separating the combustion chamber and the crankcase, except for leakage losses between the piston and the cylinder, fluid tight manner. By a fluid-tight separation of the combustion chamber and crankcase, the pressure acting on the combustion chamber side to the piston can be used to drive the piston in its movement in the direction Kurbeige- housing and to achieve an effective compression of the gas in the crankcase, so that a pressure rise comes in the crankcase. By sealing the crankcase towards the combustion chamber, a gas exchange between the crankcase and combustion chamber, and thus a pressure drop in the crankcase is largely prevented here.

A further advantageous development of the combustion arrangement is that the crankcase is connected via a bypass line with the exhaust passage of the exhaust system, whereby the compressed gas from the crankcase to the exhaust-gas aftertreatment in the exhaust passage or for conditioning of the exhaust passage can be used.

A further advantageous development of the combustion arrangement is that the exhaust system conveyor, which promote a fluid, particularly a fluid for exhaust gas treatment, for example, aqueous urea solution or a fuel of the internal combustion engine into the exhaust passage. Alternatively, it is also advantageously provided that the exhaust system comprises metering means, which metering the fluid into the exhaust duct. Particularly advantageous is a combination of conveying and dosing means which deliver the fluid from a reservoir and metered into the exhaust passage of the internal combustion engine. In particular, but also the gas can be used from the crankcase to atomize the fed by the conveying fluid or promote combustion of the fluid in the exhaust duct.

It is particularly advantageous here if the conveying means are driven by the compressed gas from the crankcase. The drive of the conveying means by the pressurized fluid in the crankcase has to dispense with an additional, mechanical or electrical, for driving the conveying means the advantage. This waiver will not only increase the efficiency of the Hubkol- piston engine, but also reduces the cost parallel. Alternatively, it is advantageously provided that pressure fluctuations are generated by the piston of the internal combustion engine in the crankcase, resulting from the pressure fluctuations pulses which either indirectly to promote the fluid, or for driving a conveying means for the fluid may be used directly. Also in this embodiment can be dispensed with further electrical or mechanical energy for the funding, thereby reducing the installation effort is reduced because no additional lines, especially in confined spaces, moved or need to be connected.

A further advantageous development consists in that the conveying means comprise a membrane pump which is driven by the pressure fluctuations in the crankcase. If the internal combustion engine, a reciprocating engine, the gas is cyclically compressed in the crankcase of the reciprocating motor and expanded, whereby pressure fluctuations in the crankcase caused by the oscillating movement of a piston of the reciprocating engine. These pressure fluctuations can be used in a simple manner to drive a diaphragm pump. In particular, it is advantageous if one, driven by the gas in the crankcase, the membrane pump pumps a different fluid from the gas in the exhaust passage. By using the diaphragm pump for pumping a liquid fluid such as aqueous urea solution or an additional fuel can which is different from the diaphragm pump, pumping unit for the fluid to be dispensed. This can reduce the number of components, whereby the effort is reduced for material and assembly. An advantageous further development is that the dosing means are arranged at the matching circuit By-. The arrangement of the dosing of the bypass line a metering of the fluid can occur in the bypass line. By an appropriate geometric configuration of the bypass line, and a targeted introduction of the compressed gas from the crankcase into the bypass line, the bypass line can be conditioned easily, whereby a more even distribution of the fluid can be achieved than with a direct dosing into the exhaust passage. In addition, the dosing are less thermally stressed in an arrangement of the bypass line than in an arrangement in the exhaust duct, where dosing can be damaged by the hot exhaust gas in the exhaust duct.

It is particularly advantageous here if the metering means, at least partly, are surrounded by the bypass line, wherein the metering means and compressed by the crankcase in the air flowing through the bypass line gas to be cooled. By cooling with gas from the crankcase to cool the dosing means or the fluid can be realized in a simple and cost-effective manner, whereby a thermal damage to the dosing agent and a decomposition, aging or crystallization of the fluid can be prevented or at least slowed down.

As a further advantageous refinement, it is provided that the metering means comprise a metering valve, in particular a pressure-controlled metering valve or a carburetor. Via a metering valve, the metered amount of fluid can be controlled, so that a demand amount of fluid via the metering valve can be metered in each case according to the amount of exhaust gas, the exhaust gas composition and / or the exhaust gas temperature. In particular, it is advantageous if the metering valve is designed as a pressure-controlled proportioning valve, which opens in a supply line for the fluid in dependence on the pressure in the crankcase and / or. By such a pressure-controlled metering valve can be dispensed with an expensive electrical or pneumatic actuation of the metering valve, whereby the thermal capacity of the metering valve increases. Alternatively, there is an advantageous further development is that the dosing means comprise a carburetor for the fluid. A carburetor provides a more favorable alternative to the introduction of a fluid to support the exhaust gas treatment in the exhaust gas duct is that in particular for an easily volatilizing fluid having a boiling point well below the normal operating of the engine temperatures in the exhaust duct, is suitable to this fluid in to convert to a gaseous state and to meter in the exhaust passage of the internal combustion engine.

drawings

Embodiments of the invention are illustrated in the drawings and explained in detail in the following description.

Fig. 1 shows a first embodiment of the combustion arrangement according to the invention.

Fig. 2 shows another embodiment of the combustion arrangement according to the invention, with metering means to a bypass line which connects the crankcase with the exhaust gas channel. Fig. 3 shows a further embodiment of the combustion arrangement according to the invention, with a membrane pump which is driven by pressure fluctuations in the crankcase.

Fig. 4 shows a further embodiment of the combustion arrangement according to the invention be cooled with the dosing by the gas from the crankcase.

Fig. 5 shows an internal arrangement of the invention with a two cylinder Boxer engine.

Brief Description of Drawings

The invention and advantageous embodiments according to the features of the further claims are explained in more detail below with reference to the drawings shown in the embodiments. In the figures, identical components or components having the same function are denoted by the same reference numerals.

In Fig.l a combustion arrangement according to the invention is shown with an internal combustion engine 10th The internal combustion engine 10 includes a crankcase 30, is disposed in which a crankshaft 40th The crankshaft 40 is connected via a connecting rod 34 with a piston 20 of the engine 10 degrees. The piston 20 of the engine 10 is slidably disposed in a cylinder 18th The internal combustion engine 10 includes a combustion chamber 15, which is connected via an inlet 12 to an intake passage 14 and an outlet 13 with an exhaust passage 51 of an exhaust system 50th In this case, the inlet 12 can be closed by a valve 17 and the outlet 13 through a valve 19th The combustion chamber 15 of the internal combustion engine 10 is limited in the cylinder 18 by the piston 20, wherein a seal of the combustion chamber 15 between the piston 20 and the cylinder 18 by piston rings 35 on the piston 20 takes place. To the cylinder 18, the crankcase 30 connects. The piston 20 is connected via a connecting rod 34 to the crankshaft 40th

The crankcase 30 of the engine 10 is connected via a line 16 to the intake passage 14, an inlet valve 38 is disposed on the crankcase 30, via which a connection between the crankcase 30 and the line 16 is closed. Further, the crankcase 30 is connected via a bypass line 33 with the exhaust passage 51 of the internal combustion engine 10, wherein an exhaust valve 39 is arranged on the crankcase 30, via which the connection of the crankcase 30 and bypass line 33 can be closed.

In the exhaust system 50 for purifying the exhaust gas of the internal combustion engine 10 is at least one device 52, 54, 56 are arranged for exhaust gas treatment. In the embodiment according to Fig. 1, three apparatus are shown for exhaust gas aftertreatment in the exhaust passage, wherein for cleaning the exhaust gas of the internal combustion engine 10 in the exhaust gas stream direction a Oxidatlonskatalysator 52, a particle filter 54 and a catalyst 56 are connected for the selective reduction of nitrogen oxides in a row. The bypass line 33 opens between the outlet 13 of the engine 10 and the Oxidatlonskatalysator 52 in the exhaust passage 50th

The internal combustion engine 10 in a known manner draws air through the intake port 14, which is compressed in the combustion chamber 15 by the piston 20th A fuel is injected into the combustion chamber 15, which mixes with the air in the combustion chamber 15 to form a fuel-air mixture. Compression of the fuel-air mixture through the piston 20 leads to an increase of pressure and temperature in the combustion chamber 15, wherein the heat released during combustion of the fuel-air mixture Energy, on the piston 20 and the connecting rod 34, the crankshaft 40 in a enable rotation. During combustion of the fuel-air mixture, a gas which is pushed by the piston 20 in a next step through the outlet 13 into the exhaust passage 51 is formed. By a translational movement of the piston 20 in the cylinder 18 not only the air in the combustion chamber 15 is compressed, but parallel to the compression of the combustion chamber 15 a connected to the crankcase 30 volume of fluid is increased in this cylinder 18, whereby the pressure in the crankcase 30 decreases. This physical effect is used to utilize the crankcase 30 as "air pump" for the introduction of so-called "secondary air" into the exhaust duct 51 of the internal combustion engine 10th In a compression phase of the internal combustion engine 10, the piston 20 moves away from the crankshaft 40, whereby a volume is increased in the crankcase 30th Here, the pressure in the crankcase 30 drops below a pressure in the intake passage 14 so that air can flow from the suction passage 14 via the conduit 16 into the crankcase 30 through the inlet valve 38th The inlet valve 38 is designed as a pressure-controlled valve which opens at a, in particular by a spring force of a valve spring, fixed pressure difference between the pressure in the crankcase 30 and the pressure in the intake passage fourteenth The air flowed into the crankcase 30 through the inlet valve 38, air is compressed by downward movement of the piston 20, the pressure in the crankcase 30 increases above the pressure in the intake passage 14 and the inlet valve 38 closes. By the further downward movement of the piston 20 increases the pressure in the crankcase 30 further, wherein a gas exchange between the combustion chamber 25 and the crankcase through the piston 20 and the piston rings is prevented as much as possible except for leakage losses 35th When it exceeds a fixed pressure threshold, the exhaust valve 39 opens to the crankcase 30 so that the air flows from the crankcase 30 via the bypass line 33 into the exhaust passage 51 of the engine 10 degrees. The introduction of air into the exhaust duct 51 takes place between the outlet 13 of the engine 10 and the oxidation catalyst 52 to the temperature of an exhaust gas of the internal combustion engine 10 before entering the oxidation catalyst 52 by an exothermic reaction of the air with unburnt hydrocarbons in the exhaust gas duct 51 to increase to bring, for example, the oxidation catalyst 52 in a cold start phase operating temperature faster.

Alternatively, the devices 52, 54, 56 may be arranged for exhaust gas treatment in a different order. Also alternatively, one or two of the three apparatuses for exhaust gas treatment described may be omitted, and also the use of a so-called "three-way catalyst" instead of an oxidation catalyst is possible, especially when the internal combustion engine 10 is constructed as a petrol engine or gas engine. Also alternatively, it is provided that the bypass line 33 is provided at another location, in particular in front of the particulate filter 54, flows into the exhaust passage 51 to increase over the introduction of the secondary air, an inlet temperature of the exhaust gas upon entry into the particulate filter 54, in particular for the regeneration of the particulate filter 54. Also in that the bypass line 33 bifurcates and flows at multiple locations in the exhaust passage 51st

In FIG. 2, a further embodiment of the combustion arrangement according to the invention. The internal combustion engine 10 is designed as a single-cylinder reciprocating engine. The exhaust system 50 includes metering means 70, wherein the dosing means 70 mounted on the bypass line 33 and are connected via a metering valve 72 to the bypass line 33rd The dosing means 70 are connected via a line 82 with conveying means 60, wherein the conveying means 60 are connected via a further line 81 to a reservoir 80 for the fluid to support the exhaust gas treatment of the internal combustion engine 10 degrees. To the crankcase 30, a further output 32 is formed, with an exhaust port connects to the output 32 of the 36th In the exhaust passage 36, a turbine 66 is arranged, which is connected via a shaft 24 with a conveyor element 26 of the conveyor 60th

On the conveyor 60, the fluid to support the exhaust gas treatment from the reservoir 80 is supplied to the metering means 70 and metered via the metering valve 72 in the bypass line 33rd In the bypass line 33, a mixing of the fluid and the gas from the crankcase 30, which leads to a more even distribution of the fluid over the cross section of the bypass line 33 is effected. The conveyor means 60 are driven by the compressed gas from the crankcase 30th The drive of the conveyor means 60 through the turbine 66 takes place in the outlet channel 36 of the crankcase 30. The crankcase 30 emerging from the gas drives the turbine 66 which in turn drives the shaft 24 via the conveyor element 26 in the conveying 60th

Alternatively, the metering means 70 may be arranged on the exhaust passage 51st It is possible for the fluid in the dosing means 70 in place by a metering valve 72 via a carburetor 74 of the bypass pipe 33 or the exhaust passage to supply the 51st Alternatively, it is possible that the conveying means 60 are driven by an external drive, for example a drive belt or an electric motor. In Fig. 3, a further embodiment of the combustion arrangement according to the invention with an internal combustion engine 10. To the crankcase 30 1 conveying means are in addition to the embodiment shown in Fig. 60 arranged comprising in this embodiment a membrane pump 62. The diaphragm pump 62 has a housing 68 to which is secured a diaphragm 63rd In the housing 68, a delivery chamber 66 is formed which via a suction valve 64 and a pressure valve 65 is closed. The diaphragm pump 62 is fluidly connected through an opening 69 in the housing 68 with the crankcase 30th Further, the diaphragm pump 62 is connected via a first line 81 to a reservoir 80 for a tool to support the exhaust gas treatment and via a further line 82 to the metering means 70, which comprise a metering valve 72nd The dosing means 70 are arranged on the exhaust passage 51 between a particle filter 54 and a catalyst 56 for the selective reduction of nitrogen oxides.

By the oscillating movement of the piston 20 in the cylinder 18, the gas is in the crankcase 30 cyclically, in synchronism compacted to the engine speed or rotational speed of the crankshaft 40 and is expanded, wherein a volume of a gas in the crankcase 30 of a case of a configured as a single-cylinder engine reciprocating engine while stroke changes to the overall displacement of the reciprocating engine. Here, in the crankcase 30 pressure fluctuations, and which act on the diaphragm 63 of the diaphragm pump 62 thus cyclically generate a negative pressure or positive pressure in a delivery chamber 66 of the diaphragm pump 62 are formed. Under reduced pressure, the fluid flows to support the exhaust gas treatment from the reservoir 80 via the line 81 through the suction valve 64 into the pumping chamber 66 of the diaphragm pump 62, the fluid is delivered at overpressure in the pumping chamber 66 via the line 82 to the metering means 70th An air supply of the crankcase 30 can approximate such accounts in this execution. Alternatively, it is provided that the crankcase 30 analogously to the discussion of Fig. 1 is supplied with air and is used to generate pressure, said air under pressure can be used to in the crankcase 30, 70 to cool the dosing means. Due to the cooling of the dosing means 70, aging, crystallization, decomposition or formation of vapor bubbles of the fluid is prevented or at least slowed down. Further, the risk of thermal damage to the dosing means 70 is reduced, in particular if an arrangement of the dosing means 70 can be avoided directly on the exhaust passage 51 from spatial restrictions not. In addition, alternatively provided that the fluid is atomized in the dosing means 70 by the set in the crankcase 30 with compressed air. For the purpose of cooling or atomization a bypass line 33 is guided from the crankcase 30 to the dosing 70th Alternatively, a metered addition of the fluid can take place for some fluids via a carburetor 74 which is positioned instead of the metering valve 72 to the exhaust channel 51 or the bypass line 33rd The fluid may, for example fuels, in particular for raising an exhaust gas temperature, regeneration means for a particulate filter or fluids which cause a reduction of pollutants in the exhaust gas, for example an aqueous urea solution for reducing nitrogen oxides used.

Fig. 4 shows a further embodiment of the combustion arrangement according to the invention, wherein the dosing means are arranged in the bypass line 33 70. The dosing means 70 are fixed by webs 84 which move in the middle of the bypass line 70, the metering means 70. The dosing means 70 are connected via a line 82 with conveying means 60, wherein the conveying means 60 are connected via a further line 81 to a reservoir 80 for the fluid. The drive of the conveyor 60 takes place in this embodiment by an additional driving source, for example electrically, hydraulically, pneumatically or mechanically, in particular via an unillustrated belt drive, which is connected to the internal combustion engine 10 degrees. The fluid is conveyed by the conveyor 60 to the metering means 70 and from there metered via the metering valve 72 in the bypass line 33rd The dosing means 70 are cooled by the compressed gas from the crankcase 30, which flows past via the outlet valve 39 in the bypass line 33 and thence to the metering means 70.

Alternatively, the metering means 70 may be arranged at or in a wall of the bypass line 33, so that the dosing means 70 are only partially covered by the bypass line. In addition to the illustrated fixation via the webs 84, a fixing of a clamping body or a different type of fixation of the metering means 70 in the bypass duct 33 is possible. Further, it is possible that the dosing means 70 are disposed in the exhaust passage 51 in the orifice area of ​​the bypass line 33, wherein the metering valve 72 the fluid is metered directly into the exhaust passage 51st

In FIG. 5 another embodiment of the combustion arrangement according to the invention, wherein the internal combustion engine 10 is designed as a two-cylinder Boxer engine. The pistons 20 of the two cylinders 18 are both fixed to the crankshaft 40, the crankshaft 40 is disposed in a common crankcase 30 for both cylinders 18th There is a power transmission of the two pistons 20 of the two-cylinder engine to a crankshaft 40 which is arranged in a common crankcase 30th In 2-cylinder boxer engines, it comes through the opposite movement of the piston 20 of the piston engine to correspondingly strong fluctuations in pressure in the crankcase 30, so that these pressure fluctuations or pressure by the compression of the gas in the crankcase 30 can be efficiently used. To the crankcase 30 conveyor means 60 are arranged, wherein the conveying means 60 are connected via a line 81 with a reservoir 80 and via a further line 82 to a bypass line 33 which leads from the crankcase 30 to the exhaust passage 51st

By an opposite movement of the cylinders 11 of the piston engine, the volume of the crankcase 30 is increased in each case by the stroke volume of both cylinders 11, or reduced. Thereby can be achieved compared with a single-cylinder engine again significantly increased pumping line. The pressure in the crankcase 30 can also be used directly for driving the conveyor 60, such as by the expansion of the compressed air antriebt a turbine 66 which, in turn, the conveyor 60, in particular a pump drives. On the conveyor 60, the fluid to support the exhaust gas treatment of the dosing means 70 is promoted, which comprise for example a carburetor 74 or a metering valve 72nd

Claims

claims
1. combustion arrangement having an internal combustion engine (10) and with the internal combustion engine (10) connected to the exhaust system (50), wherein the exhaust system (50) an exhaust duct (51) for discharging an exhaust gas of the internal combustion engine (10) and a device for the aftertreatment of the exhaust gas , wherein the device for the aftertreatment of the exhaust gas in the exhaust passage (51) is arranged, and wherein the internal combustion engine (10) a combustion chamber (15), which is delimited by a piston (20), and wherein the piston (20) on one the combustion chamber (15) side facing away from a crankcase (30) is limited, and wherein the crankcase (30) is arranged such that as a result of movement of the piston (20) is a gas, in particular air, is compressed in the crankcase (30), characterized in that that the crankcase (30) is so connected to the exhaust system (50), that the crankcase (30) compressed gas of the exhaust system (50) can be supplied.
2. Combustion arrangement according to claim 1, characterized in that the piston (20) movably disposed in a cylinder (18), said piston (20) the combustion chamber (15) and the crankcase (30) except for leakage losses between the piston ( 20) and the cylinder (18) fluid-tight, from one another.
3. Combustion arrangement according to claim 1 or 2, characterized in that the exhaust system (50) conveying means (60) and / or dosing means (70), which metering in a fluid, particularly a fluid for exhaust gas treatment, in the exhaust passage (51).
4. Combustion arrangement according to any one of claims 1 to 3, characterized in that the crankcase (30) via a bypass line (33) to the exhaust passage (51) is connected to the exhaust system (50).
5. Combustion arrangement according to claim 3 or 4, characterized in that the conveying means (60) through the compressed gas to be driven out of the crankcase (30).
6. Combustion arrangement according to claim 3 or 4, characterized in that the piston (20) in the crankcase (30) compressed gas generates pressure fluctuations, the pressure fluctuations in the conveying means (60) of the exhaust system (50) for conveying the fluid into the exhaust passage driving (51) of the internal combustion engine (10).
7. Combustion arrangement according to one of claims 3, 5 or 6, characterized in that the conveying means (60) comprise a membrane pump (62).
8. Combustion arrangement according to claim 3 and 4, characterized in that the exhaust system (50) comprises at least metering means (70), wherein the dosing means (70) to the bypass line (33) are arranged.
9. Combustion arrangement according to claim 3 and 4, characterized in that the dosing means (70), at least partially, from the bypass line (33) are coated, wherein the dosing means (70) compressed by the crankcase (30) and (through the bypass line 33 flowing) gas to be cooled.
10. A method of operating a combustion arrangement having an internal combustion engine (10) and a having the internal combustion engine (10) connected to the exhaust system (50), wherein an exhaust gas of the internal combustion engine (10) of the exhaust system (50) having an exhaust passage (51) and a device comprises for the aftertreatment of the exhaust gas is supplied, the apparatus for after-treatment of the exhaust gas at the exhaust passage (51) is arranged, wherein a combustion chamber (15) of the internal combustion engine (10) by a piston (20) is restricted, and wherein a crankcase (30 ) facing away by one (the combustion chamber 15) side of the piston (20) is limited and wherein a gas, in particular air (by movement of the piston 20) is compressed in the crankcase (30), characterized in that the crankcase (30 ) is so connected to the exhaust system (50) that (in the crankcase 30) compressed gas of the exhaust system (50) is supplied.
EP20120746083 2011-09-30 2012-08-07 Combustion assembly having an internal combustion engine and an exhaust channel and method for the exhaust treatment of an internal combustion engine Active EP2761147B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE201110083904 DE102011083904A1 (en) 2011-09-30 2011-09-30 Combustion arrangement with an internal combustion engine and an exhaust passage, and exhaust gas treatment method for an internal combustion engine
PCT/EP2012/065422 WO2013045157A1 (en) 2011-09-30 2012-08-07 Combustion assembly having an internal combustion engine and an exhaust channel and method for the exhaust treatment of an internal combustion engine

Publications (2)

Publication Number Publication Date
EP2761147A1 true true EP2761147A1 (en) 2014-08-06
EP2761147B1 EP2761147B1 (en) 2017-10-11

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Country Status (4)

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EP (1) EP2761147B1 (en)
CN (1) CN103857888B (en)
DE (1) DE102011083904A1 (en)
WO (1) WO2013045157A1 (en)

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CN103857888A (en) 2014-06-11 application
CN103857888B (en) 2017-05-03 grant
EP2761147B1 (en) 2017-10-11 grant
WO2013045157A1 (en) 2013-04-04 application

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