CN111022162A - Device for exhaust gas aftertreatment and method for operating a device - Google Patents

Device for exhaust gas aftertreatment and method for operating a device Download PDF

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Publication number
CN111022162A
CN111022162A CN201910922557.3A CN201910922557A CN111022162A CN 111022162 A CN111022162 A CN 111022162A CN 201910922557 A CN201910922557 A CN 201910922557A CN 111022162 A CN111022162 A CN 111022162A
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China
Prior art keywords
exhaust gas
combustion
fuel
compressor
pump
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Granted
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CN201910922557.3A
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Chinese (zh)
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CN111022162B (en
Inventor
托马斯·罗兰
埃德温·克罗伊茨贝格
马库斯·希力格
迈克尔·穆勒
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Thomas Magnete GmbH
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Thomas Magnete GmbH
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    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F04B17/048—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the fluid flowing around the moving part of the motor
    • 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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F01N3/32—Arrangements for supply of additional air using air pump
    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F01N3/32—Arrangements for supply of additional air using air pump
    • F01N3/323—Electrically driven air pumps
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • 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
    • 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
    • F02B37/013—Engines characterised by provision of pumps driven at least for part of the time by exhaust with exhaust-driven pumps arranged in series
    • 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
    • F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
    • F02B39/02—Drives of pumps; Varying pump drive gear ratio
    • F02B39/08—Non-mechanical drives, e.g. fluid drives having variable gear ratio
    • F02B39/10—Non-mechanical drives, e.g. fluid drives having variable gear ratio electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/08—Cooling; Heating; Preventing freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • 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
    • 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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F01N2610/102—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance after addition to exhaust gases, e.g. by a passively or actively heated surface in the exhaust conduit
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • F01N2610/144—Control thereof
    • 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
    • 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
    • Y02T10/40—Engine management systems

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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)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention relates to a device (1) for exhaust gas aftertreatment of a combustion engine (2), comprising a tank (3) for fuel, a fluid transfer device and an exhaust gas line (11). According to the invention, an electromagnetically driven dosing pump (5) can be used as a fluid delivery device for supplying fuel withdrawn by the dosing pump from the tank (3) to an injection device (6) or an evaporator (7) by means of an electrically actuated switching valve (12) in a first switching position of the switching valve (12) or to a combustion device (13) in a second switching position of the switching valve (12), wherein the injection device (6) or the evaporator (7) can feed the fuel into the exhaust gas line (11), and wherein the combustion device (13) is connected to a compressor (10) which can supply air to the combustion device, and wherein the combustion device (13) can feed the combustion products thereof into the exhaust gas line (11).

Description

Device for exhaust gas aftertreatment and method for operating a device
Technical Field
The invention relates to a device for exhaust gas aftertreatment of a combustion engine, comprising a tank for fuel, a fluid transfer device and an exhaust gas line.
Background
Devices for exhaust gas aftertreatment are known and widely prevalent. In known and effective types of devices, additional fuel is injected into the exhaust line and combusted in the exhaust gas with the remaining oxygen. For this purpose, it is necessary to arrange the injection device in a suitable manner and to have a sufficiently long mixing distance in order to achieve a satisfactory effect, in particular an increase in the exhaust gas temperature.
Disclosure of Invention
The object of the invention is to introduce fuel into the exhaust gas duct and to use different means depending on the operating state of the combustion engine in order to finely distribute the fuel or to change the temperature and composition of the exhaust gas of the combustion engine in the already burnt state.
The solution of the invention is achieved by a device having the features of the first claim and by a method having the features of the independent claim 10.
The present invention comprises the following technical teachings: the electromagnetically driven dosing pump can be used as a fluid delivery device for supplying fuel taken from the tank by the dosing pump to an injection device or a vaporizer by means of an electrically actuated switching valve in a first switching position of the switching valve or to a combustion device in a second switching position of the switching valve, wherein the injection device or the vaporizer can feed fuel into the exhaust gas duct, and wherein the combustion device is in connection with a compressor which can supply air thereto, and wherein the combustion device can feed its combustion products into the exhaust gas duct.
Since the dosing pump is combined with the switching valve, the method of introducing fuel into the exhaust line depending on the operating conditions of the combustion engine can be adapted in a simple and controlled manner. The electromagnetically driven dosage pump allows the delivery volume per time unit to be adjusted in a very simple manner, i.e. by adjusting the frequency of the electrical signal at the electromagnet.
The dependent claims contain advantageous developments of the invention.
In a preferred first embodiment, the device according to the invention has an exhaust-gas turbocharger which consists of the compressor and a turbine driven by the exhaust gas of the combustion engine, wherein the compressor is also capable of providing the combustion apparatus with the required air when the compressor is caused to be controlled or switched over. Since the air for the combustion device is discharged by the compressor, the air is referred to as bleed air.
The use of bleed air is a very inexpensive solution for supply purposes when an exhaust-gas turbocharger is present.
In a second embodiment, the apparatus has a compressor driven by an electric motor, which compressor is capable of providing the air required by the combustion device when the electric motor driving the compressor is controlled or switched to be active.
In this solution, there is no dependence on the exhaust-gas turbocharger and there is a simple possibility for switching the air flow on and off.
Preferably, the injection device has an electromagnetically actuated injection valve, a nozzle and an outlet into the exhaust gas conduit. The combustion device preferably has a mixing device for mixing air and fuel and a combustion chamber, wherein the combustion chamber is in fluid connection with the exhaust gas duct.
Instead of the injection device, an evaporator can be provided, which can introduce the fuel into the exhaust gas line, wherein the evaporator consists of a housing, an electrically heated preheating rod, an inlet and an outlet for the fuel in a known manner.
When the exhaust gas has a sufficiently high temperature, the injection device or the evaporator causes the introduced fuel to be well mixed with the exhaust gas.
The electromagnetically driven dosage pump is advantageously embodied as a reciprocating piston pump which is internally flowed through, wherein the electromagnet drives the translationally acting squeezer unit relative to the return spring, and wherein the fuel delivered by the dosage pump can flow through the magnet coil of the electromagnet and cool.
Due to the design of the reciprocating piston pump, through which the fluid flows inside, a dynamically acting seal of the reciprocating piston is not necessary, and a very reliable outward seal of the dosage pump is thereby achieved.
Advantageously, the dosing pump has a locking device which is connected in a force-fitting or form-fitting manner to the reciprocating piston of the squeezer unit and which, in cooperation with a mating element, prevents a flow through the dosing pump when the electromagnet is not energized, in the rest state of the dosing pump, which is realized by the return spring.
This prevents fuel from flowing backward in the stationary state or prevents fuel from flowing backward in the stationary state.
Advantageously, the device has a temperature sensor which reports the gas temperature in the exhaust gas line to an electrical controller which is controlled by a program, wherein the electrical controller applies a current excited by the pulse to the electromagnet of the dosage pump, and wherein the current excited by the pulse can have a temporally variable current intensity and a temporally variable pulse frequency relative to the electromagnet.
In order to operate the device, the dosage pump is supplied with pulsed current as a fluid delivery device by means of an electrical controller controlled by a program, wherein the electrical controller is itself or is in connection with an engine controller of the combustion engine and is capable of processing state information of the combustion engine, preferably state information about the load of the combustion engine and the temperature of the exhaust gas.
The electrical controller applies a pulsed current to the dosage pump in a manner which is program-dependent.
The electric controller causes a switching valve electromagnetically actuated by an electric signal to: the fuel delivered by the dosing pump is led to the injection device or to a vaporizer when the exhaust gas temperature in the exhaust gas duct is so high that the fuel at least partially vaporizes at the outlet of the injection device.
Here, the electric controller also supplies the switching valve or the evaporator with electrical energy.
Advantageously, the frequency of the pulsed current for application by the electronic controller to the dosage pump is determined in a program-specific manner as a function of the above-mentioned state information, in particular the exhaust gas temperature.
In the event that the injection device should not be supplied with fuel by the electric controller because the exhaust gas temperature is too low, the switching valve is caused by the electric signal of the electric controller to supply fuel to the combustion device.
The combustion device receives air from the compressor, which air is mixed with fuel in a mixing device and combusted in a combustion chamber, wherein the combustion chamber is in fluid connection with the exhaust gas line.
At the same time, the supply of air from the compressor to the combustion device is activated by the electric controller, for example by starting an electric motor driving the compressor.
Further details, features and advantages of the invention will emerge from the following description with the aid of the figures.
Drawings
In the drawings:
fig. 1 shows a schematic representation of an apparatus according to the invention with an injection device, a combustion device and a temperature sensor.
Fig. 2 shows a schematic representation of an apparatus according to the invention having a combustion device and an evaporator.
Fig. 3 shows a schematic representation of an exhaust-gas turbocharger.
Fig. 4 shows a schematic view of an electrically driven compressor.
Fig. 5 shows a schematic view of the spray device.
Fig. 6 shows a schematic view of a combustion device.
Fig. 7 shows a schematic view of a dosage pump.
Detailed Description
The device (1) according to the invention for exhaust gas aftertreatment of a combustion engine (2) according to fig. 1 has a tank (3) for fuel, a fluid delivery device and an exhaust gas line (11), wherein an electromagnetically driven dosage pump (5) can be used as the fluid delivery device to supply fuel taken from the tank (3) by the dosage pump to an injection device (6) or an evaporator (7) shown in fig. 2 in a first switching position of the switching valve (12) via a first line (32) or to a combustion device (13) in a second switching position of the switching valve (12) via a second line (31), which feeds the fuel into the exhaust gas line (11), by means of an electrically controlled switching valve (12).
The combustion device (13) is connected via an air line (8) to a compressor (10) which can supply the combustion device with air and the combustion device (13) can feed its combustion products into an exhaust gas line (11).
The device (1) according to the invention shown in fig. 2 has a combustion device (13) which is arranged at a significant spatial distance from the other components of the device (1) and the combustion products are introduced into the exhaust gas duct (11) via the bypass line (9).
In the embodiment according to fig. 3, the compressor (10) is coupled to a turbine (15) driven by the exhaust gas of the combustion engine (2), which together form an exhaust gas turbocharger (14). The compressor (10) can also supply the air required by the combustion device (13) via the air line (8).
In the embodiment according to fig. 4, the compressor (10) is driven by an electric motor (28). When the electric motor (28) is started, the compressor (10) can provide the air required by the combustion device (13) via the air line (8).
According to fig. 5, the injection device (6) has an injection valve (29) actuated by an electromagnet (33), a nozzle (18) and an outlet (19) into the exhaust conduit (11).
In a typical embodiment, the evaporator (7) consists of an electrically heated preheating bar, a housing and an outlet (19) into the exhaust gas duct (11).
According to fig. 6, the combustion device (13) has a mixing device (16) for mixing air and fuel and a combustion chamber (17), wherein the combustion chamber (17) is in fluid connection with the exhaust gas line (11), preferably via a bypass line (9).
The electromagnetically driven dosage pump (5) is preferably embodied as a reciprocating piston pump, as shown in fig. 7. The electromagnet (20) drives the translationally acting presser unit (21) in each case relative to a return spring (25).
The dosing pump (5) is advantageously embodied as a reciprocating piston pump through which the fuel flows, wherein the fuel delivered by the dosing pump (5) can flow through the magnet coil (22) of the electromagnet (20) and be cooled there.
Advantageously, the dosing pump (5) has a locking device (24) which is connected in a force-fitting or form-fitting manner to the reciprocating piston (23) of the squeezer unit (21) and which, in a manner interacting with the fitting element (26), prevents a flow through the dosing pump (5) when the electromagnet (20) is not energized in a rest state of the dosing pump (5) which is predetermined by a return spring (25).
Advantageously, the device (1) according to the invention according to fig. 1 has a temperature sensor (27) which reports the gas temperature in the exhaust line (11) to a program-controlled electrical controller (30), wherein the electrical controller (30) accordingly applies a current excited by the pulses to the electromagnet (20) of the dosing pump (5), and wherein the current excited by the pulses can have different current intensities and different pulse frequencies relative to the electromagnet (20).
The foregoing description of the invention is provided for the purpose of illustration only and is not intended to be limiting of the invention. Within the framework of the invention, different variations and modifications are possible without departing from the scope of the invention and its equivalents.
List of reference numerals
1 apparatus
2 combustion engine
3 storage tank
5-dose pump
6 injection device
7 evaporator
8 air pipeline
10 compressor
11 exhaust duct
12 switching valve
13 combustion device
14 exhaust gas turbocharger
15 turbine
16 mixing device
17 combustion chamber
18 spray nozzle
19 outlet port
20 electromagnet
21 extruder unit
22 magnet coil
23 reciprocating piston
24 locking device
25 return spring
26 mating element
27 temperature sensor
28 electric motor
29 injection valve
30 electric controller
31 pipeline
32 pipeline

Claims (12)

1. An apparatus (1) for the exhaust-gas aftertreatment of a combustion engine (2), having a tank (3) for fuel, a fluid delivery device and an exhaust gas duct (11), characterized in that,
an electromagnetically driven dosing pump (5) can be used as a fluid delivery device for supplying fuel taken from the tank (3) by the dosing pump to an injection device (6) or to a vaporizer (7) by means of an electrically actuated switching valve (12) in a first switching position of the switching valve (12) or to a combustion device (13) in a second switching position of the switching valve (12),
wherein the injection device (6) or the evaporator (7) is capable of feeding the fuel into the exhaust conduit (11),
and wherein the combustion device (13) is in connection with a compressor (10) which can be supplied with air,
and wherein the combustion device (13) is capable of feeding its combustion products into the exhaust conduit (11).
2. An arrangement (1) as claimed in claim 1, characterized in that the arrangement (1) has an exhaust-gas turbocharger (14) which consists of the compressor (10) and a turbine (15) which is driven by the exhaust gas of the combustion engine (2), wherein the compressor (10) is furthermore able to provide the combustion device (13) with the required air as bleed air when it is caused to be controlled or switched.
3. An apparatus (1) according to claim 1, characterized in that the apparatus (1) has a compressor (10) driven by an electric motor (28), which compressor is capable of providing the air required by the combustion device (13) when the electric motor (28) driving the compressor (10) is controlled or switched to be active.
4. Device (1) according to one of the preceding claims, characterized in that the injection means (6) have an electromagnetically actuated injection valve (29), a nozzle (18) and an outlet (19), wherein the outlet (19) is connected to the exhaust gas duct (11).
5. Device (1) according to one of the preceding claims, characterized in that the combustion device (13) has a mixing device (16) for mixing air and fuel and a combustion chamber (17), wherein the combustion chamber (17) is in fluid connection with the exhaust gas duct (11).
6. Device (1) according to one of the preceding claims, characterized in that the electromagnetically driven dosage pump (5) is embodied as a reciprocating piston pump, wherein an electromagnet (20) drives a translationally acting squeezer unit (21) with respect to a return spring (25).
7. The device (1) according to claim 6, characterised in that the dosing pump (5) is embodied as a reciprocating piston pump through which the fuel delivered by the dosing pump (5) can flow through the magnet coil (22) of the electromagnet (20).
8. Device (1) according to claim 6 or 7, characterized in that the dosage pump (5) has a locking device (24) which is connected in a force-fitting or form-fitting manner with the reciprocating piston (23) of the squeezer unit (21), which locking device, in cooperation with a fitting element (26), prevents flow through the dosage pump (5) when the electromagnet (20) is not energized, in the rest state of the dosage pump (5) which is achieved by the return spring (25).
9. The device (1) according to one of the preceding claims, characterized in that the apparatus (1) has a temperature sensor (27) which reports the gas temperature in the exhaust gas duct (11) to an electronic controller (30) which is controlled by a program, wherein the electronic controller (30) applies a current excited by pulses to the electromagnet (20) of the dosage pump (5), and wherein the current excited by pulses can have a temporally changeable current intensity and a temporally changeable pulse frequency relative to the electromagnet (20).
10. Method for operating a device (1) for exhaust gas aftertreatment of a combustion engine (2), wherein the device (1) has a tank (3) for fuel, a fluid transfer device and an exhaust gas line (11),
it is characterized in that the preparation method is characterized in that,
the dosage pump (5) is supplied with pulsed current as a fluid delivery device by means of an electrical controller (30) controlled by a program, wherein the electrical controller (30) is itself or is connected to the engine controller of the combustion engine (2) and is capable of processing state information, preferably state information about the load of the combustion engine (2) and the temperature of the exhaust gas,
and wherein the electrical controller (30) applies a pulsed current to the dosage pump (5) in a manner which is program-specifically dependent on the mentioned status information and causes a switching valve (12) which is electromagnetically actuated by means of an electrical signal to: the fuel delivered by the dosing pump (5) is conducted to the injection device (6) or to the evaporator (7) when the exhaust gas temperature in the exhaust gas duct (11) is so high that the fuel at least partially evaporates at the outlet (19) of the injection device (6),
and wherein furthermore the electric controller (30) supplies the switching valve (12) or the evaporator (7) with electrical energy.
11. The method for operating an apparatus (1) for exhaust gas aftertreatment of a combustion engine (2) according to claim 10, characterized in that the frequency of the pulsed current for application to the dosage pump (5) by the electric controller (30) is determined by the electric controller (30) in a program-determined manner in dependence on state information about the load and the exhaust gas temperature of the combustion engine (2).
12. Method for operating an arrangement (1) for the exhaust-gas aftertreatment of a combustion engine (2) according to claim 10 or 11, characterized in that the electric controller (30) instead of the switching valve (12) initiates the fuel supply to the combustion device (13) by means of the electric signal of the electric controller (30) in the event that the injection device (6) should not be supplied with fuel because the exhaust-gas temperature is too low,
the combustion device (13) receives air from a compressor (10), the air is mixed with the fuel in a mixing device (16) and combusted in a combustion chamber (17), the combustion chamber (17) being in fluid connection with the exhaust gas line,
and wherein the supply of air from the compressor (10) to the combustion device (13) is activated simultaneously by the electrical controller (30).
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