WO2012019883A1 - Système et procédé de post-traitement de gaz d'échappement d'un moteur à combustion interne - Google Patents

Système et procédé de post-traitement de gaz d'échappement d'un moteur à combustion interne Download PDF

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Publication number
WO2012019883A1
WO2012019883A1 PCT/EP2011/062310 EP2011062310W WO2012019883A1 WO 2012019883 A1 WO2012019883 A1 WO 2012019883A1 EP 2011062310 W EP2011062310 W EP 2011062310W WO 2012019883 A1 WO2012019883 A1 WO 2012019883A1
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WO
WIPO (PCT)
Prior art keywords
water
fluid
metering
control means
vehicle
Prior art date
Application number
PCT/EP2011/062310
Other languages
German (de)
English (en)
Inventor
Stefan Stein
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
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2012019883A1 publication Critical patent/WO2012019883A1/fr

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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
    • F01N3/24—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/46—Cleaning windscreens, windows or optical devices using liquid; Windscreen washers
    • B60S1/48—Liquid supply therefor
    • B60S1/50—Arrangement of reservoir
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H3/00—Other air-treating devices
    • B60H3/02—Moistening ; Devices influencing humidity levels, i.e. humidity control
    • 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
    • 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
    • F01N2610/14—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
    • F01N2610/1426—Filtration means
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • 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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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 a system and a method for operating a vehicle according to the preamble of the independent claims.
  • water separators are used which deposit a large part of the free water dissolved in the fuel.
  • Such a water separator is known from DE 10 2004 032 251 B4.
  • Water in components of exhaust aftertreatment systems, injection systems or compressed air systems of a motor vehicle can lead to corrosion.
  • the significantly reduced lubricity of water compared to diesel fuel can additionally increase the wear of the components during operation.
  • the quality of the fluid, such as diesel fuel can be increased, however, it can remain fluid residues in the extracted water, so far the extracted water had to be disposed of consuming and expensive as a potential hazardous substance.
  • water in the exhaust line can be dispensed with a costly disposal of water, since the fluid residues in the water here support the exhaust aftertreatment and in for the environment, especially the groundwater, harmless components, especially carbon dioxide and water.
  • the inventive system and the inventive method for exhaust aftertreatment solve the task with little design effort, the benefits of extraction of water from a fuel such as compressed air or fuel with the exhaust aftertreatment of an internal combustion engine.
  • the effort of manual water drainage is saved from a sump of a water separator, as the system automatic water draining, even while driving, is possible.
  • test means are present which check whether a predetermined first operating state exists and that control means are provided which in the case of a positive test result of the test equipment enable the dosing of the extracted water in a functional unit of the motor vehicle.
  • This makes it possible with little design effort, the benefits of extraction of water from a fuel such. Compressed air or fuel with the exhaust aftertreatment, in particular the metering of an auxiliary medium to support the exhaust aftertreatment in the exhaust system of an internal combustion engine to connect. It is particularly advantageous that the expense of manually draining water from a collecting container is saved by means for extracting water from a fluid, since the system enables automatic draining of the water, in particular during operation of the internal combustion engine.
  • an automated emptying of the means for the extraction of water from a fluid can be carried out in a simple and cost-effective manner, wherein the means in particular comprise a water separator, so that the expense of manual water drainage can be saved.
  • the extracted water can thus be used or disposed of elsewhere in the motor vehicle.
  • the functional unit is the exhaust system of the internal combustion engine.
  • the fluid supply to the exhaust line can be regulated or controlled in terms of time and volume, so that the extracted water in the time in which no fluid is needed to support the exhaust aftertreatment, is metered and not supply the fluid supply for optimum exhaust aftertreatment disturbs.
  • An advantageous development of the system consists in that, in the case of a second predetermined operating state of the internal combustion engine detected by the testing means, the control means release the metering in of the fluid, in particular after extraction of the water from the fluid, into the exhaust gas line of the internal combustion engine.
  • the fluid contains a reduced proportion of water, whereby the lubricating properties of the fluid are better than for the same fluid with a relatively higher proportion of water, especially in diesel fuel, so that the wear of the components of the exhaust aftertreatment system is reduced.
  • the exhaust aftertreatment can be improved by the reduction of the water content in the exhaust aftertreatment fluid, since the fluid has a higher energy density than the same fluid with a relatively higher water content, thereby raising the exhaust gas temperature under the same boundary conditions.
  • the effectiveness of the exhaust aftertreatment can potentially increase because higher conversion rates can be achieved in other devices for exhaust aftertreatment, such as an oxidation catalyst by the higher exhaust gas temperatures.
  • a common control device for the metering of water and fluid can be used in the exhaust system, which limits the number of additional components.
  • control means release the metering of the fluid independently of the detected operating state. It is advantageous that the fluid can thus be metered independently of the extracted water or in addition to the extracted water.
  • the control means release the metering of the extracted water into the exhaust gas line and block the metering of the fluid and, in the case of the second operating state detected by the checking means, metering the fluid into the meter Release the exhaust system and block the metering of the extracted water into the exhaust system.
  • the fluid for exhaust gas aftertreatment for example diesel fuel for regeneration of a diesel particulate filter or compressed air
  • the first operating state the extracted, potentially contaminated with fluid residues water can be made harmless through the exhaust system and disposed of.
  • test means detect the second operating state when they detect the completion of the release of the dosing of the extracted water into the exhaust line after a release of the dosing of the extracted water in the exhaust system.
  • the extracted water is removed as quickly as possible from these components. Therefore, it is beneficial if, after the first operating state in which the metering of the extracted water into the exhaust gas line is released, the control device switches over to the second operating state in which the metering of the fluid is released in order to flush the system and the water to remove from the components of the system.
  • test means recognize the second predetermined operating state when, in particular, starting from a different operating state from the second operating state, recognize a shutdown request of the internal combustion engine.
  • the checking means for example a control unit used to control the internal combustion engine, determine with a test program realized, for example, in software form, that a shutdown request of the internal combustion engine is present, to start the flushing process, so that when the engine is switched off no water in the components for exhaust aftertreatment remains and here the risk of corrosion is minimized.
  • control means are designed as a valve, in particular as a 3/2-way valve or as a solenoid valve, or as a throttle.
  • the execution of the control means as a valve allows a particularly simple and thus cost-effective design of the control means, in particular a 3/2-way valve, which either releases the connection from the fluid outlet of the water separator to the metering element and at the same time blocks the connection between the water outlet of the water separator and the metering element or releases the connection from the water outlet of the water separator to the metering element and at the same time blocks the connection from the fluid outlet of the water separator to the metering element.
  • only the metering in of one of the two media, water or fluid is released at the same time.
  • Solenoid valves are particularly suitable for releasing or blocking the dosing of the extracted water.
  • a throttle in particular a controllable throttle, is also suitable for controlling the supply of the extracted water or the fluid to the exhaust line and for releasing or blocking the metering.
  • a further advantageous development is characterized in that the means for extracting water have a membrane, in particular a semipermeable membrane.
  • a membrane that is permeable to water, but impermeable to fuel, the water can be separated from the medium in a simple and cost-effective manner.
  • the means for extracting water additionally comprise a water purification module.
  • the extracted water can be freed again of impurities and contamination, the cleaning facilitates the use of the extracted water in other functional units of the vehicle, for example for headlight or windscreen cleaning or moistening the vehicle air in the vehicle.
  • the water purification module has a semi-permeable membrane, wherein the membrane is permeable to water and largely impermeable to fuel.
  • a further advantageous development consists in that the means for extracting water are designed as hollow bodies, in particular as hollow-fiber membrane modules.
  • a hollow body in which the medium flows through the interior of the hollow body and the water is deposited to the outside is advantageous.
  • a favorable ratio of surface area of the water separator to volume flow through the hollow body and thus a high Wasserabscheide- rate is achieved.
  • the use of a hollow-fiber membrane module is particularly advantageous, since this advantage is further enhanced by a multiplicity of thin channels and correspondingly enveloping surfaces.
  • the membrane consists of an ionomer, in particular a sulfonated tetrafluoroethylene polymer.
  • the use of an ionomer for the membrane has the advantage that the ionomer membrane has the desired property of being permeable to water and permeable to fuel.
  • the group of tetrafluoroethylene polymers is particularly advantageous here for functional, production and durability reasons.
  • test means comprise detection means, comparison means and detection means.
  • the determining means in particular investigators for detecting temperatures, especially temperatures of fluid, water or exhaust gas, for time measurement and / or for level measurement, in particular for level measurement of a collecting container of the water separator can thus determine a measured variable, which with a in a comparison means, in particular software stored Comparison values are compared and detecting means which recognize the presence of an operating state of the system when comparing the determined measured variable with the comparison value predetermined in the comparison means.
  • the process steps running in the system can be automated and / or controlled or regulated.
  • the determination means comprise a level gauge, which determines the amount of extracted water, that the comparison means compare the determined amount with a set threshold value (M s ) and that the detection means recognize the first operating state, if the determined Amount of extracted water exceeds the predetermined amount threshold (M s ).
  • M s set threshold value
  • M s predetermined amount threshold
  • the determination means comprise a timer which determines an operating time of the internal combustion engine that the comparison means compare the determined operating time with a predetermined time threshold (t s ) and that the detection means recognize the first operating state, if the determined operating time exceeds the predetermined time threshold (t s ).
  • the metering of the water can be released when a defined operating time of the internal combustion engine is reached in order to overflow the extracted water from the To avoid collecting container, wherein an automation of the process control over the comparison means and / or detection means is made possible.
  • the detection means comprise a temperature sensor which determines the exhaust gas temperature, that the comparison means compare the determined exhaust gas temperature with a predetermined temperature threshold (T s ) and the detection means only recognize the first operating state when the temperature determined by the temperature sensor reaches or exceeds the predetermined temperature threshold value (T s ).
  • T s predetermined temperature threshold
  • the extracted water does not evaporate when metered into the exhaust system, which can lead to corrosion damage, especially corrosion damage in the exhaust system, and / or contained in the extracted water fluid residues not by further devices for exhaust aftertreatment, especially in the exhaust system Internal combustion engine arranged further devices for exhaust aftertreatment, be sufficiently cleaned and / or converted into harmless to the environment substances.
  • a further advantageous development is that downstream of the control means dosing means for metering the extracted water and / or the fluid are arranged in the exhaust line.
  • dosing means for metering the extracted water and / or the fluid are arranged in the exhaust line.
  • the dosing accuracy and direction of the amount to be dosed of the water and / or the fluid can be improved.
  • an undesirable wall wetting of the exhaust gas line can be reduced by the extracted water.
  • the dosing means comprise a metering unit and an injection unit.
  • the injection unit can be optimally positioned in or on the exhaust gas line in order to meter in the extracted water and / or the fluid into the exhaust gas flowing through the exhaust gas line.
  • a further advantageous development of the system consists in that the injection unit is designed as an injection valve, in particular as an outwardly opening injection valve or as an outwardly opening poppet valve.
  • the use of an injection valve as an injection unit offers the advantage that when the injection valve is closed there is a secure separation of exhaust gas in the exhaust gas line and water or fluid in the system.
  • the advantage here is the use of an outwardly opening valve, since outwardly opening valve reduce the risk of coking of the fluid at the valve seat and thus a change in the metered amount.
  • Outwardly opening poppet valve additionally offer the advantage that the water or the fluid arrive in a wide cone angle in the exhaust system and are thus well distributed in the exhaust gas flow.
  • a further advantageous development is that at least two of the amount of the means for extracting water, the control means, the dosing and the test means are at least partially integrated in a common device, in particular with a common housing. This reduces the number of components to be assembled, resulting in time savings and cost reduction in assembly.
  • control means release the metering of the extracted water downstream of the metering unit and upstream of the injection unit. This corrosion damage to the metering unit can be avoided because it is not flowed through by the extracted water. This also allows the use of cheaper materials in the metering unit.
  • control means release the metering of the fluid upstream of the metering unit or via a second injection unit. Due to the separate metering of extracted water and fluid, the variability of the system can be increased since the water and the fluid are metered into the exhaust line at different locations, whereby an individual optimization of the metering point for water and fluid is made possible.
  • use of a second injection unit allows the simultaneous metering of extracted water and fluid, which increases the application possibilities of the exhaust aftertreatment system.
  • control means comprise a solenoid valve, a check valve and / or a throttle.
  • a check valve By using a check valve, a solenoid valve or a throttle in a connecting line from the water outlet of the water separator to the injection unit, a backflow of the fluid via the connecting line to the water separator, in particular to a collecting container for the extracted water can be prevented.
  • the control means comprise a connection line which connects a fluid outlet at the means for extraction of water or a fluid source directly to the metering unit or the second injection unit. This development has the positive effect that only the supply of the extracted water must be blocked or released, so that the use of a simple and inexpensive valve is possible here for control.
  • the functional unit is a cleaning system for vehicle windows or vehicle headlights, in particular a collecting container of this cleaning system. It is advantageous that the cleaning liquid can be replenished by the extracted water.
  • the functional unit is an automotive air conditioning system, in particular a unit for moistening the air of a vehicle interior. It is advantageous that the water for moistening the room air during driving occurs and does not need to be refilled externally.
  • An advantageous method for operating a vehicle is characterized in that a predetermined mixing ratio of extracted water and the fluid is adjusted by the control means in the time average.
  • a predetermined mixing ratio of extracted water and the fluid is adjusted by the control means in the time average.
  • control means in particular a solenoid valve with a frequency greater than 1 Hz is driven in order to achieve a dispersion or mixture of extracted water and the fluid. Due to the high drive frequency, in the event that the fluid does not mix with the water, a dispersion of extracted water and fluid can be prepared and this dispersion can be metered into the functional unit. In the event that water and fluid can be mixed, a homogeneous mixture can be achieved. In this case, a solenoid valve for the required drive frequencies is particularly suitable.
  • a further advantageous development of the method consists in detecting physical input variables of extracted water and the fluid in a first method step and specifying a desired value for a mixing ratio of extracted water and the fluid, and in a second method step as a function of Setpoint and the determined physical input variables, the mixing ratio over a drive time or drive frequency of the control means, in particular a solenoid valve or a 3/2-way valve is set.
  • the physical properties of the extracted water or of the fluid for example the temperature or the pressure during the preparation of a mixture or a dispersion can be taken into account in a simple manner.
  • FIG. 1 and Fig. 2 show the inventive system for exhaust aftertreatment in a schematic representation
  • Fig. 3 to Fig. 6 show concrete embodiments of the system in a schematic representation
  • Fig. 7 shows details of the means for extracting water used in the exhaust aftertreatment system of the present invention
  • Fig. 8 shows a flow chart for controlling mixture formation of extracted water and fluid
  • Fig. 1 the inventive system for exhaust aftertreatment is shown in a schematic manner.
  • the exhaust gas aftertreatment system has a tank 12 filled with fluid 12, which is connected via connecting lines 13, 14 to the means 30 for the extraction of water 31, the connecting lines comprising a conveying means 20.
  • the means 30 are connected via a line 19 to a functional unit 100 and via a line 17 to an exhaust line 40 of an internal combustion engine 5 of a motor vehicle. Furthermore, the system comprises test means 80 for detecting an operating state of the internal combustion engine 5 and control means 90.
  • the conveying means 20 delivers the fluid 12 from the tank via the connecting lines to the means 30 for the extraction of water 31.
  • the test means 80 determine whether a first operating state is present and influence the control means 90 such that in the case of a positive test result of the test means 80, the dosing of the extracted water 31 via the connecting line 19 in a functional unit 100 of the motor vehicle is released.
  • the functional unit 100 can be, for example, the collecting container of the wiper water, a collecting container for moistening the air for vehicle interior air conditioning or the exhaust tract 40 of the internal combustion engine 5.
  • the claimed exhaust aftertreatment system comprises the components within the dashed line in FIG. 1, but may also comprise one or more of the further components, in particular the components shown outside the dashed line to illustrate and explain the function.
  • the functional unit 100 is the exhaust tract 40 of the internal combustion engine.
  • the means 30 for the extraction of water 31 are shown as a water separator, which is connected via two connecting lines 17, 19 with the control means 90.
  • a first connection line 17 for the fluid 12 leads from a fluid outlet of the means 30 for extraction of water 31 to the control means 90 and a second connection line 19 for the extracted water 31 from a water outlet of the means 30 for extraction of water 31 to the Control means 90.
  • a further connecting line 42 leads into the exhaust line 40 of the internal combustion engine. 5
  • FIG. 3 a first concrete embodiment of the inventive system for exhaust aftertreatment is shown.
  • the system has a tank 12 filled with fluid 12, which is connected via supply line 13 to a conveyor element 20.
  • the conveying element 20 is connected via a further supply line 14 with a filter 25, which is connected via a further supply line 16 with the means 30 for the extraction of water 31, here shown as a water separator 30 with a semi-permeable membrane 71.
  • a water separator 30 with a semi-permeable membrane 71.
  • two outlet openings are formed, which are referred to below as fluid outlet 32 and water outlet 34.
  • the water separator 30 is connected via the fluid outlet 32 and a connecting line 17 to a high-pressure pump 99 of a fuel injection system under further with an internal combustion engine 5.
  • the water separator 30 is further connected via the fluid outlet 32 and connecting lines 17,18 with a control means 35, in the example shown a 3/2 -way valve connected.
  • the water separator 30 is connected to the control means 35 via the water outlet 34 and a connecting pipe 19, the connecting pipe 19 comprising an extracted water collecting tank 31.
  • the control means 35 is connected via a connecting line 42 with a dosing means 50, which at one with the Internal combustion engine 5 connected exhaust line 40 is arranged.
  • the illustrated system has a temperature sensor 47 arranged in the exhaust line 40.
  • the lying within the dashed line components represent components of the claimed system for exhaust aftertreatment, the other components are only to illustrate and explain the function of the system.
  • a fluid 12 mixed with water 31 can lead to damage of injection components up to failure of the injection system.
  • the water 31 contained in the fluid 12 can already lead to these damages, which is why some manufacturers for high-pressure injection systems already water separator with deposition rates of> 95% of the fluid 12, i. be required in the fuel, dissolved water.
  • the separated water 31 may contain residues of the fluid 12.
  • this water 31 can be disposed of easily and without environmental hazard by the extracted water 31 is disposed of from the water 30 via the dosing 50 in the exhaust line 40.
  • Existing residues of fluid 12, in particular fuel are burned in the exhaust line 40 and thus made harmless.
  • the fluid 12, in particular fuel, is conveyed out of the tank 10 via the connecting lines 13, 14 to the water separator 30 by means of the conveying element 20, wherein the fluid 12 flows through the filter 25, which filters out particles and impurities from the fluid 12, which the water separator 30 or damage other system components or could reduce the effectiveness of the water separator 30.
  • the fluid 12 continues to flow to the high-pressure pump 99 and is supplied to the internal combustion engine 5 in a known manner.
  • the delivery element 20 can be dispensed with if the fluid 12 is sucked out of the tank 10 by the high-pressure pump 99 or a pre-delivery pump, not shown, upstream of the high-pressure pump 99.
  • the filter 25 can also be arranged between the tank 10 and the conveying element 20.
  • the system may be run without filter 25. As it flows through the water separator 30, the water 31 dissolved in the fluid 12 is extracted and fed to a collecting container 29.
  • a very effective water separator 30 for example, a hollow body shown in FIG. 7, for example, a so-called hollow fiber membrane module 76 may be used, in which the fluid 12 flows within thin pipes 78 and the extracted water through the thin pipes 78 formed as a semipermeable membrane the gaps 79 are extracted.
  • the hollow-fiber membrane module 76 with its many thin pipes 78 is characterized by having a large surface area and high separation rates of water 31 from the fluid 12.
  • a level meter 36 is arranged on the collecting container 29, via which the amount of extracted water 31 in the collecting container 29 can be measured.
  • the collecting container 29 may also be integrated in the water separator 30.
  • the fluid 12 flows via the fluid outlet 32 through the connecting lines 17,18 to the control means 35 and the extracted water 31 from the collecting container 29 via the connecting line to the control means 35th
  • the system comprises test means 80 which check whether a predetermined operating state is present and control means 90 which release the dosing of the extracted water 31 in the case of a positive test result of the test means 80.
  • the control means 90 comprise those actuators which are suitable for releasing and blocking the dosing of the extracted water 31.
  • the control means 90 is formed as a 3/2-way valve 35, alternatively, solenoid valves 27 or throttles 28, in particular adjustable throttles, can be used as a control means 90.
  • the test means 80 comprise detection means, comparison means, and detection means.
  • the detection means comprise sensors 36 for determining the amount of extracted water 31, in particular a level gauge 36 on the collecting container 29, timers for determining an operating time of the internal combustion engine 5, in particular a timer 37 and temperature sensors 47 for determining the exhaust gas temperature.
  • the comparison means compare a measured variable determined by the determination means with a predetermined comparison quantity.
  • the comparison means may for example be stored in software in the control unit 24, wherein the control unit 24 itself also belongs to the test means 80.
  • the detection means detect an operating state by the comparison of a determined measured variable of the determination means with a predetermined comparison variable from the comparison means.
  • the first operating state is when the test means 80 recognize that a defined level of the collecting container 29 has been reached or a predetermined time interval of the operating time has elapsed. If the test result is positive, the dosing of the extracted water 31 is released by the control means 90.
  • a second predetermined operating state is present when the first operating state is not detected and the test means 80, in particular the temperature sensor 37, additionally recognize that the exhaust gas temperature is above a temperature threshold value.
  • control means 90 release the dosing of the fluid 12, in particular after extraction of the water 31 from the fluid 12, into the exhaust line 40 of the internal combustion engine 5.
  • control means 90 for example valves, in particular 3/2-way valves 35, advantageous in the case of the detected by the test means 80 first operating state, the metering of the extracted water 31 in the exhaust line 40 and lock the metering of the fluid 12 and in the case of the detected by the test means 80 second operating state, the metering of the fluid 12 in the exhaust line 40 and release the metering of the extracted water 31 into the exhaust line 40.
  • the test means 80 recognize the second operating state when they detect the completion of the release of the dosing of the extracted 31 in the exhaust line 40 after a release of the dosing of the extracted water 31 in the exhaust line 40.
  • the water remaining in the components after metering in the extracted water 31 is flushed out by the fluid 12 from the components of the exhaust aftertreatment system, in particular from the control means 90 and downstream of the control means 90, so that the residence time of water 31 in the conduit 42 and in the dosing means 50 are as short as possible to avoid corrosion damage by the water 31. It is particularly desirable that when stopping the engine 5, no water 31 remains in the control means 35 or the dosing means 50 and in the conduit 42, since with the internal combustion engine 5, the risk of corrosion by the water 31 is the highest.
  • the checking means 80 also recognize the predetermined second operating state if they detect a shutdown request of the internal combustion engine 5, in particular on the basis of an operating state different from the second operating state.
  • the detection of the shutdown request of the internal combustion engine can be done for example via the control unit 24.
  • the system may be further developed by the level gauge 36, which determines the amount of extracted water 31 in the sump, sending a signal to the comparison means 38, the comparison means 38 providing the determined amount of extracted water 31 with a predetermined amount threshold (M s ) and the detection means 39 detect the first operating state when the determined amount of the extracted water 31 exceeds the predetermined quantity threshold value (M s ).
  • the system comprises a timer 37, which determines an operating time of the internal combustion engine 5, wherein the determined operating time of the comparing means with a predetermined time threshold (t s ) is compared and the detection means recognize the first operating state, when the determined operating time the exceeds the predetermined time threshold (t s ).
  • the system comprises the temperature sensor 47, which determines the exhaust gas temperature, wherein the comparison means compare the determined exhaust gas temperature with a predetermined temperature threshold (T s ) and the detection means recognize the first operating state only when the temperature detected by the temperature sensor 47 predetermined temperature threshold (T s ) reached or exceeded.
  • T s predetermined temperature threshold
  • the control means 90 is connected via a connecting line 42 to the exhaust line 40, wherein between the control means 90, in particular a 3-2-way valve 35, and the exhaust line metering means 50 may be arranged.
  • These dosing means 50 can be carried out both in one piece, as well as in several parts, the dosing means 50 comprising a metering unit 51 and an injection unit 52.
  • the injection unit is preferably designed as an injection valve in order to achieve a dense separation of the exhaust gas in the exhaust line 40 and the fluid 12 and / or the water 31.
  • Outwardly opening valves have the advantage that they are more robust in terms of coking and associated problems such as changing injection quantities or leaks than inwardly opening valves.
  • Particularly advantageous is the use of an outwardly opening poppet valve, since in addition a broad injection cone of the fluid 12 and / or of the water 31 is achieved in the exhaust line 40, wherein the eindo- The fluid 12 and / or the metered-in water can mix well with the exhaust gas in the exhaust line 40.
  • Fig. 4 shows an alternative embodiment, wherein the water outlet 34 of the water separator 30 is connected via a connecting line 19 with a connecting line 43 between the metering unit 51 and the injection unit 52 of the dosing.
  • a solenoid valve 27 and a throttle 28 are arranged, with which the dosing of the extracted water can be released and limited.
  • the solenoid valve 27 or the throttle 28, in particular a controllable throttle can be used to release the dosing of the extracted water 31.
  • the throttle 28 is arranged as close as possible to the connecting line 43 in order to avoid a backflow of the fluid 12 into the connecting line 19 and to reduce pressure oscillations in the connecting lines 19, 43.
  • the use of a check valve instead of the throttle 28 in the connecting line 19 is possible.
  • a further embodiment is shown, wherein the fluid outlet 32 of the water separator 30 is connected via a connecting line 17 with a dosing means 50.
  • a control means 90 in particular a solenoid valve 27 or a throttle 28 may additionally be arranged in the connecting line 17 here as well.
  • the water outlet 34 of the water separator 30 is connected via a connecting line 19 with a further dosing means 54, wherein control means 90 are arranged in the connecting line 19.
  • control means 90 are arranged in the connecting line 19.
  • a solenoid valve 27 and a throttle 28 are arranged, with which the metering of the extracted water 31 can be released and limited.
  • only the solenoid valve 27 or the throttle 28, in particular a controllable throttle, can be used to release the dosing of the extracted water 31.
  • control means 90 in particular the solenoid valve 27 or the throttle 28, can release the metering independently of the detected operating state. This makes it possible to simultaneously meter in the extracted water 31 and the fluid 12 into the exhaust line 40 of the internal combustion engine.
  • FIG. 6 shows an alternative embodiment of the system for exhaust aftertreatment, wherein the fluid 12 is not fuel, but compressed air, in particular the compressed air from the compressed air system is a utzmarkedes.
  • a tank 10 in this example a compressed air reservoir, is connected via a line 12 to a conveying element 20 which is designed as a pressure generator and to a further line 14, 16 with a water separator 30, which is preceded by a filter element 25.
  • a fluid outlet 32 and a water outlet 34 is formed at the water separator 30, a fluid outlet 32 and a water outlet 34 is formed.
  • the water outlet 34 opens into the collecting container 29, which is connected via the line 19,42 with the dosing means 50.
  • the fluid outlet 32 is also connected via the line 17,18,42 with the dosing means 50, but has a further connecting line which connects the fluid outlet 32 with the pneumatic brake system 60 of a utzberges. Between the water separator 30 and the metering element 50, the control 35 is arranged.
  • the fluid 12 is pressurized by the conveying element 20 and flows from the tank 10 to the water separator 30.
  • the water separator 30 for example, by cooling the air, the water from the air is condensed and separated.
  • the metering of the fluid 12, i. the compressed air, is analogous to the description of FIG. 1.
  • FIG. 8 shows a flow chart for controlling a mixture formation of extracted water 31 and fluid 12.
  • a method for operating a vehicle is proposed in which the control means 90, or by the control of the 3/2-way valve 35 or of the solenoid valve 27, a predetermined mixing ratio of extracted water 31 and the fluid 12 is set in the time average.
  • a duration of a control of the control means 90, in particular of the solenoid valve 27 and the 3/2-way valve 35, is varied during an operating state in which extracted water 31 is metered in, so that the desired mixing ratio of extracted water 31 and fluid 12 sets.
  • Frequencies greater than 1 Hz, ie a drive time less than one second, are advantageous, since a fine dispersion or mixture can be achieved with such a short drive time.
  • the maximum drive time is determined by the reciprocal of the drive frequency. Based on the physical input variables, for example, pressure p 3 of the fluid 12, pressure pi of the extracted water 31, back pressure p 2 in the functional unit, temperatures ⁇ / ⁇ 2 of the extracted water 31 and the fluid 12, possibly further input variables and a desired value of the mixing ratio between extracted water 31 and fluid 12, the driving duration and driving frequency of the control means 90 are determined.

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

Abstract

L'invention concerne un système et un procédé pour faire fonctionner un véhicule, le système comprenant un moyen d'extraction de l'eau d'un fluide, en particulier d'un fluide pour l'assistance d'un post-traitement de gaz d'échappement du véhicule, caractérisé en ce qu'il est prévu des moyens de contrôle, destinés à contrôler s'il existe un premier état de fonctionnement prédéterminé, et en ce qu'il est prévu des moyens de commande qui, en cas d'un résultat de contrôle positif des moyens de contrôle, libèrent le dosage de l'eau extraite dans une unité fonctionnelle du véhicule.
PCT/EP2011/062310 2010-08-09 2011-07-19 Système et procédé de post-traitement de gaz d'échappement d'un moteur à combustion interne WO2012019883A1 (fr)

Applications Claiming Priority (4)

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DE102010039068.2 2010-08-09
DE102010039068 2010-08-09
DE102011078495.0 2011-07-01
DE102011078495A DE102011078495A1 (de) 2010-08-09 2011-07-01 System und Verfahren zur Abgasnachbehandlung einer Brennkraftmaschine

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
FR2994422A1 (fr) * 2012-08-09 2014-02-14 Peugeot Citroen Automobiles Sa Bouchon de reservoir de liquide sous pression assurant la mise sous pression et la purge automatique du reservoir.
WO2019081165A1 (fr) * 2017-10-24 2019-05-02 Mahle International Gmbh Dispositif de filtre à carburant pour un moteur à combustion interne

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Publication number Priority date Publication date Assignee Title
US4780211A (en) * 1986-11-07 1988-10-25 Desalination Systems, Inc. Method of dewatering using PTFE membrane
DE4436415A1 (de) 1994-10-12 1996-04-18 Bosch Gmbh Robert Einrichtung zum Nachbehandeln von Abgasen einer selbstzündenden Brennkraftmaschine
DE102004046887A1 (de) * 2004-09-28 2006-03-30 Robert Bosch Gmbh Kraftstoffversorgungseinrichtung für eine Brennkraftmaschine
US20080110812A1 (en) * 2006-11-13 2008-05-15 Mahle Tennex Industries, Inc. Separated water treatment system for diesel fuel engine
DE102004032251B4 (de) 2004-07-03 2008-05-29 Daimler Ag Vorrichtung zur Abscheidung von Wasser und zur Ausfilterung von Verunreinigungen
US20090113880A1 (en) * 2007-11-01 2009-05-07 Clausen Michael D Diesel engine
WO2009153584A1 (fr) * 2008-06-18 2009-12-23 Parker Hannifin (Uk) Ltd Système de drainage de liquide
WO2011113464A1 (fr) * 2010-03-18 2011-09-22 Daimler Ag Système d'amenée de carburant

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4780211A (en) * 1986-11-07 1988-10-25 Desalination Systems, Inc. Method of dewatering using PTFE membrane
DE4436415A1 (de) 1994-10-12 1996-04-18 Bosch Gmbh Robert Einrichtung zum Nachbehandeln von Abgasen einer selbstzündenden Brennkraftmaschine
DE102004032251B4 (de) 2004-07-03 2008-05-29 Daimler Ag Vorrichtung zur Abscheidung von Wasser und zur Ausfilterung von Verunreinigungen
DE102004046887A1 (de) * 2004-09-28 2006-03-30 Robert Bosch Gmbh Kraftstoffversorgungseinrichtung für eine Brennkraftmaschine
US20080110812A1 (en) * 2006-11-13 2008-05-15 Mahle Tennex Industries, Inc. Separated water treatment system for diesel fuel engine
US20090113880A1 (en) * 2007-11-01 2009-05-07 Clausen Michael D Diesel engine
WO2009153584A1 (fr) * 2008-06-18 2009-12-23 Parker Hannifin (Uk) Ltd Système de drainage de liquide
WO2011113464A1 (fr) * 2010-03-18 2011-09-22 Daimler Ag Système d'amenée de carburant

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2994422A1 (fr) * 2012-08-09 2014-02-14 Peugeot Citroen Automobiles Sa Bouchon de reservoir de liquide sous pression assurant la mise sous pression et la purge automatique du reservoir.
WO2019081165A1 (fr) * 2017-10-24 2019-05-02 Mahle International Gmbh Dispositif de filtre à carburant pour un moteur à combustion interne

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