CN102635425B - For by the device and method in liquid meter to the flue gas leading of internal combustion engine - Google Patents

For by the device and method in liquid meter to the flue gas leading of internal combustion engine Download PDF

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Publication number
CN102635425B
CN102635425B CN201210028554.3A CN201210028554A CN102635425B CN 102635425 B CN102635425 B CN 102635425B CN 201210028554 A CN201210028554 A CN 201210028554A CN 102635425 B CN102635425 B CN 102635425B
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Prior art keywords
liquid
dosing pump
pressure
valve
flue gas
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CN201210028554.3A
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CN102635425A (en
Inventor
V·罗伊辛
S·施泰因
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Robert Bosch GmbH
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Robert Bosch 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
    • F01N3/18—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]
    • 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]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/16—Exhaust treating devices having provisions not otherwise provided for for reducing exhaust flow pulsations
    • 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
    • F01N2290/00—Movable parts or members in exhaust systems for other than for control purposes
    • F01N2290/08—Movable parts or members in exhaust systems for other than for control purposes with oscillating or vibrating movement
    • F01N2290/10—Movable parts or members in exhaust systems for other than for control purposes with oscillating or vibrating movement actuated by pressure of exhaust gases, e.g. exhaust pulses
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
    • 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
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • F01N2610/1433—Pumps
    • F01N2610/144—Control thereof
    • 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
    • F01N2610/1446—Means for damping of pressure fluctuations in the delivery system, e.g. by puffer volumes or throttling
    • 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
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • 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
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1808—Pressure
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1821—Injector parameters
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1822—Pump parameters
    • 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

Abstract

The present invention relates to for by liquid (12), in particular for supporting that the liquid (12) of waste gas reprocessing is metered into the device in the flue gas leading (8) of internal combustion engine (5), wherein, this liquid (12) is metered in the flue gas leading (8) of this internal combustion engine (5) by spray nozzle device (30), wherein, this spray nozzle device has valve (31), and wherein, controlled by dosing pump (20) or the metering of liquid (12) that regulates to this spray nozzle device (30).In the case of this dosing pump (20) controlled turn-on, this valve (31) periodically opens and cuts out in vibration work.

Description

For by the device and method in liquid meter to the flue gas leading of internal combustion engine
Technical field
The present invention relates to for by the device and method in liquid meter to the flue gas leading of internal combustion engine.
Background technology
The most can not come only by the measure of engine interior owing to becoming the strictest waste gas discharge legislation Reach about the limits value of harmful substance in engine exhaust gas.Therefore, on internal combustion engine, especially set on the internal combustion engine of motor vehicles Found waste gas reprocessing device, especially catalyst converter and the filter in the flue gas leading being arranged in internal combustion engine.Main in self-ignition Use the waste gas reprocessing device of enhancing on internal combustion engine, wherein by the liquid meter being used for supporting waste gas reprocess be input to interior In the flue gas leading of combustion engine.This can enumerate fuel metering for particle filtering as an example input or for selectively reducing oxygen The metering changing the aqueous solution of urea in the catalyst converter of nitrogen inputs.Hot recycling for particulate filter then improves the waste gas of internal combustion engine Temperature, so that controllably burning the carbon black being included in particulate filter, raising the arranging by electromotor of this EGT It is impossible for executing, and needs an additional ejector fuel metering to be input in waste gas, and this fuel is urged an oxidation Change and catalytically react on device with release the heat needed for raising temperature.
By the known a kind of metering device of DE 10 2,007 016 004, waste gas is reprocessed agent meter by one of them dosing pump Amount it is input in the waste gas installation of internal combustion engine.
Known for a kind of liquid meter is ejected in the flue gas leading of internal combustion engine by DE 10 2,006 057 425 Device, one of them is operated in injection valve in vibration work and the liquid meter of importing is ejected into the flue gas leading of internal combustion engine In.
Summary of the invention
According to the present invention, it is proposed that a kind of for by the device in liquid meter to the flue gas leading of internal combustion engine, wherein, this liquid Body is metered in the flue gas leading of this internal combustion engine by spray nozzle device, and wherein, this spray nozzle device has a valve, and wherein, by meter Amount pump controls or regulates the metering of the liquid to this spray nozzle device, wherein: this valve in the case of the controlled turn-on of this dosing pump Periodically opening and close in vibration work, the pressure of opening of described valve is higher than the deposit being connected to before described dosing pump Pressure in container or higher than the pressure being connected in the low tension loop before described dosing pump, wherein, described dosing pump with It is provided with ripple damper between described spray nozzle device.
According to the present invention, it is also proposed that a kind of for by the method in liquid meter to the flue gas leading of internal combustion engine, wherein, it is somebody's turn to do Liquid is metered in this flue gas leading of this internal combustion engine by the spray nozzle device with valve, wherein: controlled by dosing pump or Regulating the metering of this liquid, wherein, the pressure of opening of described valve is higher than in the tank being connected to before described dosing pump Pressure or higher than the pressure in the low tension loop being connected to before described dosing pump, wherein, at described dosing pump and described nozzle Ripple damper it is provided with between device.
The device with feature described in technique scheme has its advantage, is i.e. controlled by a dosing pump or is adjusted The metering of joint liquid, so that carrying out the generation of pressure and the metering of liquid on a position, wherein injection valve is in vibration work Middle liquid meter is input in flue gas leading, thus can make little value liquid meter input flue gas leading and reach the thinnest Atomization.In the case this metering not by or the fluctuation that is under pressure the most minutely disturbed, be such as arranged on by one The interference of the pressure oscillation that the feedway before dosing pump, the low tension loop of an especially fuel injection system produce.This leads Cause the system design of the simplification with simple hydraulic characteristic, related to measuring the broader operation interval of value and higher metering Degree of accuracy.The most such as reduce cost and owing to simple hydraulic characteristic makes by eliminating a metering units Application cost on internal combustion engine reduces, need not consider when application the most here the restriction with corresponding complicated hydraulic characteristic by The valve of the pressure oscillation that two or more pressure currents cause.
The favourable of the device and method that is given in technique scheme is can get by the measure described in the description below Configuration and improvement further.
Another favourable further configuration is: spray nozzle device has a pressure controlled valve, and this valve is reaching or super Cross one and open pressureTime metering from releasing liquid to the flue gas leading of internal combustion engine input.This pressure controlled valve can Electric control and thus can being advantageously carried out on extremely simple and cost.
The most particularly advantageously, valve open pressureHold higher than the deposit being connected to before dosing pump Pressure in device or higher than the low tension loop being connected to before dosing pump, a such as fuel injection system low tension loop in Pressure.The most only when being caused pressure to raise relative to the pressure in tank or low tension loop by dosing pump, this valve is just beaten Open.
Another favourable further configuration is: dosing pump in the case of function is disturbed, especially persistently energising or Liquid is not carried in the case of electrical short.Be can be avoided that in the case of fault or function are disturbed by this further configuration Liquid is discharged in flue gas leading and by being discharged in surrounding there.If no longer being provided liquid by dosing pump when function is disturbed Body, injection valve remains turned-off, so that being not result in that less desirable liquid inputs to the metering of flue gas leading.The most also can be simple Ground embodies " failure safe (fail safe) " function of this device, so that do not have liquid meter ground when dosing pump fault defeated Enter in the flue gas leading of internal combustion engine.
In order to improve metering precision advantageously, dosing pump the counter-pressure in the amount of the liquid carried and flue gas leading without Close or the amount measuring input of liquid is only connected relevant to the control of dosing pump.By using an adjustable piston pump conduct Dosing pump can realize metering and metering input the most in a unit, the most only wherein measures the amount of liquid of input Relevant to the control on-time of dosing pump.
One favourable form of implementation is, wherein between dosing pump and spray nozzle device, especially between dosing pump and valve It is provided with a ripple damper.Tank or one by a fuel injection system are between low tension loop and dosing pump The damping of pressure vibration further increasing the metering precision of dosing pump.The damping of the pressure vibration between dosing pump and valve It is particularly advantageous, the impact of fluctuation because the vibration work of valve can be under pressure.
The most particularly advantageously, dosing pump make liquid be under the pressure with 1 to 10 hertz frequency and/or Injection valve periodically opens with the frequency of about 1000Hz and cuts out.Frequency is connected in the control of the dosing pump in this frequency range For: the amount of liquid making dosing pump required when will typically be in waste gas reprocessing under a constant flows to injection valve.Work as spray The amount of liquid that penetrating is provided by dosing pump when valve works with about 1000Hz flutter will input with thin and little share metering And thus it is evenly distributed in flue gas leading in waste gas stream, without causing the deposition on injection valve or in flue gas leading.
Accompanying drawing explanation
Fig. 1 represents the device of the liquid meter input in the flue gas leading of internal combustion engine of according to the present invention,
Fig. 2 represents a conversion of the device inputted according to the liquid meter in the flue gas leading for internal combustion engine of the present invention Form of implementation,
Fig. 3 represents the relation of a coordinate diagram, the amount of liquid provided described in it and exhaust back pressure power by dosing pump,
Fig. 4 represents the fluid pressure of metering delivery side of pump and the curve of the relation of dosing pump control,
Fig. 5 represent injection valve periodically turn on and close in vibration work in the case of pressure on injection valve and metering The curve of the relation that pump controls.
Detailed description of the invention
The present invention and the spy according to other claim will be described in detail below by the embodiment shown in accompanying drawing The advantageous configuration levied.Component identical in Fig. 1 and 2 or there is the component of identical function indicate with identical label.
Fig. 1 represents the first embodiment according to assembly of the invention.For laying in the tank 10 of a kind of liquid 12 It is connected with a filter 13 by a connection conduit 41.Filter 13 connects conduit 45 and a metering by one second Pump 20 connects, and is wherein provided with a pressure transducer 24 on connection conduit 45.Another connects conduit 46 by the one of dosing pump 20 Individual outfan 21 is connected to a spray nozzle device 30, such as one injection valve 31, is wherein provided with an arteries and veins on connection conduit 46 Fluctuation dampers 22 and a pressure transducer 26.Injection valve 31 is arranged on the flue gas leading 8 of an internal combustion engine 5.
If in order to support that liquid 12 should be input in the flue gas leading 8 of internal combustion engine 5 by the reprocessing of waste gas with measuring, metering Pump 20 is by connection conduit 41 by tank 10 pumping liquid 12, and wherein liquid 12, such as aqueous solution of urea or fuel are in mistake Filter 13 is cleaned and flows to dosing pump 20 by connecting conduit 45.Dosing pump 20 makes liquid 12 be placed under a pressure (P), The curve that the pressure (t) in time wherein produced on dosing pump outfan by dosing pump 20 is changed is the most substantially For " rectangle ", in other words, produce a precipitous pressure when dosing pump 20 controls to connect and rise until dosing pump 20 Individual surge pressure level (PP), wherein this surge pressure level remains to the end controlling to connect of dosing pump 20 as much as possible, Then this pressure (P) the most steeply declines.Dosing pump 20 also has a function, i.e. mensuration in addition to pressure produces and should measure defeated Enter the amount of liquid 12 in flue gas leading 8.This mensuration was carried out in the control on-time of dosing pump 20.
By the surge pressure level (P produced in dosing pump 20P) on injection valve 31, acted on a hydraulic coupling, should Hydraulic coupling is more than acting on the closing force on the closing feature 32 of injection valve 31.By overcoming the closing feature 32 of injection valve 31 Closing force makes injection valve 31 reach one and opens pressure At this moment injection and the liquid of liquid 12 is opened and undertaken to injection valve 31 The spraying treatment of 12.The pressure (P) on injection valve 31 is easily made temporarily to drop into a closedown by opening of injection valve 31 Pressure (PSOn), thus the closing feature 32 of injection valve 31 is closed again.Pressure (P) is made to go up again by the closedown of closing feature 32 Rising, therefore form a feature, i.e. injection valve 31 and periodically open and close, this is referred to as " vibration work ".This with meter The pressure curve controlling the relevant vibration work of connection of amount pump 20 is represented as the change of (t) in time in Figure 5.By spray That penetrates valve 31 the most periodically opens and closes the waste gas every time having a liquid 12 to be in a small amount discharged into internal combustion engine 5 measuredly In pipe 8.Dosing pump 20 is further characterized in that: the conveying capacity (Q) of liquid 12 as illustrated in fig. 3 with the counter-pressure in flue gas leading 8 (Δ P) is unrelated.The amount of dosing pump 20 controls to carry out by pulsewidth modulation and FREQUENCY CONTROL in the case.When dosing pump 20 Do not control to set up pressure when connecting, so that injection valve 31 is for cutting out when dosing pump 20 does not controls to connect.
Being provided with a ripple damper 22 with injection valve 31 on the connection conduit 46 being connected by dosing pump 20, it can damp Produced by the pressure in dosing pump 20 and/or by being measured, by the liquid 12 of injection valve 31, the pressure vibration that input is formed.? In the case of this, injection valve 31 is made to disc valve that outwardly open, spring-loaded.
Can cancel the mechanical guide of closing feature in the case, at this moment the closing feature 32 of injection valve 31 is by a valve Spring positions and flows through injection valve 31 by liquid 12 and carrys out centering.Here each component of injection valve 31 is made by metal.Cause The work of vibration reliably for injection valve 31 is only only possible in the pressure limit of an opposite, narrow, and ripple damper 22 will be avoided Depart from this narrow pressure limit.Here this ripple damper 22 is made to diaphragm antivibrator, volume pneumatically or hydraulically.In these feelings Under condition ripple damper preferably be arranged on the outfan of dosing pump 20 tight near.This ripple damper 22 also may be used in conversion Combination is in dosing pump 20.
Pressure (P) in this outer catheter 45 is measured and in conduit 46 by the pressure transducer 24 being arranged on conduit 45 Pressure measured by pressure transducer 26.By the two pressure transducer 24,26 can monitor dosing pump 20 function and Usefulness.Interference or the fault of injection valve 31 can be additionally detected by pressure transducer 26.It is cold that injection valve 31 can be made to air But or water cooling.
Also ripple damper 22 and at least one pressure can be cancelled in conversion in a simple form of implementation of this device Force transducer 24,26.Especially when cancelling ripple damper 22 advantageously, the conduit 46 between dosing pump 20 and injection valve 31 Catheter length can be the shortest, in order to make pressure here involve pressure vibration related to this and be kept as much as possible low. Embodiment shown in Fig. 1 the most also can be cancelled the filter 13 between dosing pump 20 and tank 10, wherein will By dosing pump 20 by conduit 45 directly from tank 10 pumping liquid 12.Dosing pump 20 is preferably rendered to be adjustable work The oscillating piston pump of plug pump, such as operation electriomagnet.But use other the pump according to extrusion principle work, especially the most convertiblely It is the pump that can show the pressure curve shown in Fig. 4.Injection valve 31 also can be made to the disc valve inwardly opened in conversion Or realize with other form of implementation.The all parts of injection valve 31 also can by nonmetallic materials, the pottery that is especially suitable for, Polymeric material or composite make.In a particularly simple form of implementation this device be used as one the most cooled Injection valve 31.
Fig. 2 represents the embodiment of a conversion according to assembly of the invention.The low tension loop of one fuel injection system 15 include a tank 10 for reserve liquid 12 and a delivery pump 14.Tank passes through a connection conduit 41 It is connected with a filter 13.Another connection conduit 42 is directed to the defeated of the low tension loop 15 of fuel injection system by filter 13 Send pump 14.Delivery pump 14 is connected with a branch point 52 by a conduit 43.One connection conduit 45 is guided by branch point 52 Dosing pump 20, is wherein provided with a pressure transducer 24 on connection conduit 45.One connection conduit 44 is led by branch point 52 To fuel injection system high-pressure area 18, wherein this high-pressure area 18 includes a high pressure in known form of implementation Pump, a pressure accumlator and at least one fuel injector.High-pressure area 18 is by a return-flow catheter 49 and tank 10 connect.Another connection conduit 46, by the outfan Guide spray valve 31 of dosing pump 20, is wherein provided with one on connection conduit 46 Individual ripple damper 22 and a pressure transducer 26.Injection valve 31 is arranged in the flue gas leading 8 of internal combustion engine 5.
Liquid 12, especially fuel pass through delivery pump 14 by pumping out in tank 10 and flowing to by connecting conduit 41 In filter 13, here will be filtered out granule and dirt by liquid 12.Liquid 12 flows to conveying by connection conduit 42 from here Pump 14, liquid is compressed herein and is transported to branch point point 52 by conduit 43.The Part I stream of liquid is led by connection Pipe 44 is flowed to the high-pressure area 18 of fuel injection system by branch point 52, and Part II stream flows to metering by connecting conduit 45 Pump 20.It is provided with a pressure transducer 24 connecting on conduit 45, measures the pressure of the liquid 12 connected in conduit 45 by it Power.The pressure of dosing pump 20 produces and is similarly implemented with the embodiment according to Fig. 1.
Delivery pump 14 is set in low tension loop 15 between tank 10 and filter 13 the most convertiblely.Equally may be used In conversion, delivery pump 14 especially includes a filter 13 in suction side.Also two can be had as another conversion delivery pump 14 Outfan, wherein an outfan of delivery pump 14 is by connecting conduit 45 and be connected with dosing pump 20 and another of delivery pump 14 being defeated Go out end by connecting the high-pressure area 18 of conduit 44 and fuel injection system, being especially connected with high-pressure pump.Connect conduit in conversion 45 also can be connected with the low-voltage output of a high-pressure pump belonging to high-pressure area 18, can set the most here on connection conduit 45 There is an additional ripple damper, in order to the pressure vibration of damping high-voltage pump.

Claims (13)

1., for liquid (12) is metered into the device in the flue gas leading (8) of internal combustion engine (5), wherein, this liquid (12) is by spray Mouth device (30) is metered in the flue gas leading (8) of this internal combustion engine (5), and wherein, this spray nozzle device has a valve (31), and wherein, The metering of the liquid (12) controlled by dosing pump (20) or regulate to this spray nozzle device (30), it is characterised in that: in this metering In the case of pump (20) controlled turn-on, this valve (31) periodically opens and cuts out in vibration work, beating of described valve (31) Open pressureHigher than the pressure being connected in the tank (10) before described dosing pump (20) or described higher than being connected to The pressure in low tension loop (15) before dosing pump (20), wherein, at described dosing pump (20) and described spray nozzle device (30) Between be provided with ripple damper (22).
Device the most according to claim 1, it is characterised in that: described valve (31) is pressure controlled valve, and this valve is reaching Or exceed and open pressureTime releasing liquid (12) to described internal combustion engine (5) described flue gas leading (8) in metering.
Device the most according to claim 1 and 2, it is characterised in that: the situation that described dosing pump (20) is disturbed in function Under do not carry liquid (12).
Device the most according to claim 1 and 2, it is characterised in that: the liquid (12) carried by described dosing pump (20) Measure or liquid (12) unrelated with the counter-pressure in described flue gas leading (8) metering input amount only with the control of described dosing pump (20) Turn-on is correlated with.
Device the most according to claim 1 and 2, it is characterised in that: the amount of described dosing pump (20) controls to adjust by pulsewidth System or frequency modulation(PFM) realize.
Device the most according to claim 1 and 2, it is characterised in that: being provided with pressure transducer (24), this pressure transducer is used Regulation or diagnosis in dosing pump.
Device the most according to claim 1, it is characterised in that: described liquid (12) is the liquid for supporting waste gas to reprocess Body.
Device the most according to claim 1, it is characterised in that: described low tension loop (15) is the low pressure of fuel injection system Loop.
Device the most according to claim 1 and 2, it is characterised in that: described dosing pump (20) is at persistently energising or electrical short In the case of do not carry liquid (12).
Device the most according to claim 6, it is characterised in that: described pressure transducer (24) is for described dosing pump (20) the pressure transducer controlling or regulating.
11. for being metered into the method in the flue gas leading (8) of internal combustion engine (5) by liquid (12), and wherein, this liquid (12) is by tool The spray nozzle device (30) having valve (31) is metered in this flue gas leading (8) of this internal combustion engine (5), it is characterised in that: by metering Pump (20) controls or regulates the metering of this liquid (12), wherein, described valve (31) open pressureHigher than being connected to institute State the pressure in the tank (10) before dosing pump (20) or low push back higher than be connected to before described dosing pump (20) Pressure in road (15), wherein, is provided with ripple damper (22) between described dosing pump (20) and described spray nozzle device (30).
12. methods according to claim 11, it is characterised in that: described liquid (12) is for supporting that waste gas is reprocessed Liquid.
13. methods according to claim 11, it is characterised in that: described low tension loop (15) is the low of fuel injection system Push back road.
CN201210028554.3A 2011-02-10 2012-02-09 For by the device and method in liquid meter to the flue gas leading of internal combustion engine Active CN102635425B (en)

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FR2971545A1 (en) 2012-08-17

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