CN102022168B - Method of monitoring function of selective catalytic reaction (SCR) catalyst - Google Patents
Method of monitoring function of selective catalytic reaction (SCR) catalyst Download PDFInfo
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- CN102022168B CN102022168B CN201010283974.7A CN201010283974A CN102022168B CN 102022168 B CN102022168 B CN 102022168B CN 201010283974 A CN201010283974 A CN 201010283974A CN 102022168 B CN102022168 B CN 102022168B
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- scr catalyst
- catalyst system
- valve
- metering valve
- resorption
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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]
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/05—Systems for adding substances into exhaust
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1466—Means for venting air out of conduits or tanks
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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
- 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
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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
- 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
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- 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
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- 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
Abstract
The invention relates to a method of monitoring the function of a selective catalytic reaction (SCR) catalyst, which is the method of monitoring the function of the SCR catalyst being as the waste gas aftertreatment system of an internal combustion engine. The SCR catalyst comprises at least one feed pump (5), at least one manifold valve (9), at least one metering valve (3) and at least one pressure sensor (10). In the sucking-back module of a SCR catalyst system (1), the negative pressure establishment in the SCR catalyst system can be observed by means of at least one measuring value of the pressure sensor (10). When the at least one measuring value deviates an expected reference value, the mistake of the function of the SCR catalyst system can be concluded.
Description
Technical field
The present invention relates to a kind of method monitoring the function of SCR catalyst system, this SCR catalyst system is the exhausted gas post-processing system of internal-combustion engine.In addition, the invention still further relates to a kind of computer program and a kind of computer program performing the method.
Background technique
Be used for driving the method and apparatus of internal-combustion engine to be known especially in a motor vehicle, SCR catalyst system (Selective Catalytic Reduction) is arranged in its exhaust gas region, and it makes the nitrogen oxide (Nox) be contained in engine exhaust gas be reduced into nitrogen when reducing agent participates in.Therefore, the amount of nitrogen oxides in waste gas can obviously be reduced.Reduction process needs ammonia (NH
3), this ammonia is mixed in waste gas.Therefore NH can be applied
3or NH
3the reactant decomposed, as reactant.Usually, use moisture urea liquid (aqueous solution of urea), it sprayed in waste gas system by measuring apparatus before SCR catalyst system, and this measuring apparatus also has metering valve for this reason.NH is formed thus in solution
3, this NH
3play reducing agent.In order to store urea liquid, be provided with reducing agent tank or aqueous solution of urea tank.
Reducing agent tank is equipped with so-called pumping tube usually, is used for an aqueous solution of urea from then on to extract out in tank.In order to the transport urea aqueous solution or medium, be provided with pump, this pump flows to measuring apparatus medium (i.e. aqueous solution of urea) by pipe-line system, and therefore aqueous solution of urea sprays in waste gas system under stress by metering valve (injection valve of such as electromagnetism).The pipeline of SCR catalyst system can be arranged like this, and namely set so-called resorption pattern by the switching of multi-way valve (such as No. 4/2 valve), this resorption pattern can be extracted medium out from pipeline.Described resorption is necessary because aqueous solution of urea at low ambient temperatures (especially at the temperature of-11 DEG C or lower) can freeze.Medium freezes in pipeline may damage pipe-line system.Therefore specify, medium can lead back in reducing agent tank again.In order to set resorption pattern, needing correspondingly to control (controlling especially electrically) No. 4/2 valve, and controlling the transfer pump being preferably equipped with integrated restrictor check valve.
All functional fault may be there is at the diverse location of SCR catalyst system.Such as on valve, (especially on multi-way valve or metering valve) breaks down.In addition, also may affect or disturb the function of transfer pump.In addition, pipe-line system also may blow-by or appearance leakage.This point especially may because metering valve is separated by the pipeline section of several meters long and transfer pump.These pipeline pressure-loaded, wherein pressure about 5bar usually.All pipelines (such as plastic flexible pipe) and the link that is usually also made of plastics all may occur damaging and blow-by due to aging, setup error or other damage.Thus, this may reveal environmentally harmful aqueous solution of urea on the one hand.On the other hand, can not guarantee again thus to carry out normal exhaust after-treatment.
Usually, in SCR catalyst system, the sealing of (especially in pipe-line system) detects by this way, and namely this system is by running transfer pump pressure-loaded.And then, the motor of the pump that stops also is observed, and how pressure declines rapidly.If pressure can not remain enough and/or it is until pressure sets up the overlong time continued, then can conclude that this system is packing less.Therefore, the open source literature DE 102006013293A1 of such as German describes a kind of method, the pressure be used in diagnostic reaction agent metering system, reactant is placed on pressure source in this method, and the reactant pressure that records and threshold value are compared, and send error signal when exceeding threshold value.
This controlling method has different shortcomings.If really there is blow-by or leakage in such a system, then because the foundation of pressure can discharge more how environmentally harmful aqueous solution of urea.In addition, can only determine obviously to reveal by this controlling method.This is, this system has throttle orifice usually, and it is required, can guarantee pressure adjusting function.Even if other system is sealing, still can reveals pressure by this throttle orifice, therefore can not provide at all and analyze qualitatively.Therefore, the leakage of highly significant can only be determined.
Summary of the invention
By the object of the invention is, get rid of the described shortcoming of the known sealing propertytest of SCR catalyst system, and a kind of method of better monitoring SCR catalyst system is provided.This object is achieved by a kind of method described in content as claimed in claim 1.The preferable configuration of the method is drawn by dependent claims.
Arrange be used for monitoring the function of SCR catalyst system by method of the present invention, this SCR catalyst system is the exhausted gas post-processing system of internal-combustion engine.SCR catalyst system also comprises at least one transfer pump, at least one multi-way valve (especially No. 4/2 valve) and at least one metering valve.This transfer pump arranges be used for the helping a small child urinate by holding his legs apart plain aqueous solution or medium export from reducing agent tank.Then, this medium sprays in waste gas system under stress by metering valve.This multi-way valve (especially No. 4/2 valve) arranges be used for switching to resorption pattern from suction mode, and therefore medium can be carried return and lead back in reducing agent tank from pipe-line system.SCR catalyst system also has at least one pressure transducer, and it is preferably arranged in pipe-line system in the downstream of transfer pump.Be by the feature of method of the present invention, in the resorption pattern of SCR catalyst system, the negative pressure that at least one measured value by pressure transducer is observed in SCR catalyst system is set up.When the reference value of at least one measured value described and expection has deviation, reference value of this expection represents normally functioning system, then the function that deducibility goes out SCR catalyst system breaks down.Also be by the basis of method of the present invention, in normally functioning SCR catalyst system, in resorption pattern, set up negative pressure.If this negative pressure can not or can not be set up with the degree of expection and/or keep, then deducibility has and there is fault.Being also advantageous in that of the method, this SCR catalyst system has been ready to implement resorption pattern usually, is used for a medium to send back to reducing agent tank from pipeline.The resorption pattern utilizing this to arrange by method of the present invention, so that monitoring or diagnosis SCR catalyst system.For this reason, the element installing other in SCR catalyst system is not needed yet, because the element existed can be employed if desired.
In order to implement by method of the present invention, and in order to set resorption pattern, preferably control multi-way valve like this, namely medium is released from the pipeline of SCR catalyst system when controlling transfer pump.Analyze the negative pressure set up in this mode in pipe-line system.For this reason, detect this or these pressure transducer survey numerical value, and contrast reference value analysis.The numerical value of this reference value representative pressure sensor, this numerical value may detect in normally functioning SCR catalyst system.If the numerical value of these or this actual measurement and this or these reference value have deviation, then deducibility goes out, and the functional of SCR catalyst system can not or at least can not intactly be brought into play.
In especially preferred embodiment of the present invention, before resorption pattern or period at least temporarily close at least one metering valve described.When metering valve cuts out, with especially obvious method establishment negative pressure in the pipe-line system of SCR catalyst system.By in the structural scheme of method of the present invention, especially good or obvious signal can be obtained.
Preferably by the sealing detecting SCR catalyst system by method of the present invention.If negative pressure can not be set up or can not fully set up in resorption pattern, or set up slower than reference value, then deducibility goes out, and this system is packing less or there is leakage.
By in another preferred embodiment of method of the present invention, by observing the negative pressure in take-back model, detect the functional of at least one metering valve described.This point can be carried out like this, namely before resorption pattern or period close metering valve, therefore can set up negative pressure.For realize test purpose open metering valve time, negative pressure should suddenly reduce.If can not confirm the pressure change expected, then deducibility goes out, and metering valve does not normally work or closed to block.The metering valve openly blocked also can be determined by the present invention.For this reason, negative pressure is set up when metering valve is opened.Then control metering valve with throttle down, this should be able to strengthen negative pressure, as long as metering valve is normally functioning.Control metering valve by repeating changes with observation pressure the switching capability carrying out test and measuring valve.
By in another preferred embodiment of the present invention, detect the functional of at least one transfer pump described.If establish negative pressure when implementing resorption pattern, then deducibility goes out transfer pump is normally functioning.If do not set up negative pressure, then the integrated restrictor check valve on such as safety check or pump is packing less, or pump has fault in other side.
In addition, preferably the functional of described at least one multi-way valve (especially No. 4/2 valve) is also detected.If this multi-way valve function is abnormal, then it is such as seized, and can not be switched to resorption pattern when controlling multi-way valve.Under pipe-line system stays pressure operated pattern in the case, therefore negative pressure can not be set up.
Such as can detect the element of SCR system as follows by the present invention ground: first start resorption pattern when metering valve cuts out.When multi-way valve function is normal, when carrying electric motors function normal and when metering valve function is normal, or when metering valve cuts out, by the increase obviously can surveyed of negative pressure, identifiable design is to the foundation of negative pressure.If open metering valve, then pressure should suddenly reduce, or negative pressure should reduce.If observe these expected results, then deducibility goes out, and all required element of resorption pattern is all normally functioning.
By in the especially preferred structural scheme of method of the present invention, detect the normal change of resorption process.Usually, by this system being transferred in resorption pattern in specific Applicative time, resorption is out from the pipe-line system of SCR catalyst system can to make medium.Whether lead back to from pipe-line system practically without the need to detecting medium or be withdrawn in reducing agent tank, just can realize this resorption.Different possible error reason need not be considered at this, such as multi-way valve is seized, transfer pump has fault, system blow-by etc.Such as, if this system is packing less, if or metering valve made dirty, so a small amount of air may suck, then greatly may extend medium and take the required time completely away from pipe-line system.By the present invention, by the change of the negative pressure of overview setup, monitor the change of resorption process, because the negative pressure set up in pipeline when existing medium is different from the negative pressure set up in pipeline in case of air.
The present invention also comprises a kind of computer program, if this computer program runs on the calculating equipment or controller of internal-combustion engine, then it implements the institute of described method in steps.Finally, the present invention also comprises a kind of computer program with program-code, and this computer program is stored on machine-readable carrier, if this program is run on calculating equipment or controller, and the method described in enforcement.By this computer program, SCR catalyst system can be monitored in very favorable mode.Especially can by the foundation of negative pressure in the pipe-line system of SCR catalyst system, whether function is normal to determine the different elements of SCR catalyst system.In addition, also can the sealing of supervisory system by this computer program.The special advantage of computer program is, it can be applicable in existing Motor Vehicle, without the need to installing other element in SCR catalyst system additional.Only need match with analysis software, namely operate on the controller of internal-combustion engine realize by being stored in the computer program on computer program.
Accompanying drawing explanation
By reference to the accompanying drawings, from the following description of embodiment, other advantage of the present invention and feature is drawn.Single feature can separately or in combination with each other realize at this.
Fig. 1 shows the different elements of SCR catalyst system (prior art) in the diagram;
Fig. 2 shows the MEDIA FLOW in SCR catalyst system in resorption pattern in the diagram;
Fig. 3 shows the oscillogram of pressure sensor voltage, and this produces when implementing the preferable configuration scheme by method of the present invention;
Fig. 4 shows another oscillogram of pressure sensor voltage, and this produces when implementing the preferable configuration scheme by method of the present invention.
Embodiment
Fig. 1 shows the different elements from the known SCR catalyst system 1 of prior art in the diagram.This SCR catalyst system 1 arranges be used for the waste gas of combustion motor (not shown) and carry out reprocessing.For this reason, the reducing agent (it is stored in reducing agent tank 2) of fluid is sprayed in waste gas system under stress by metering valve 3.Metering valve 3 such as refers to the injection valve of electromagnetism, and it is controlled by controller 4.This reducing agent exports by pumping tube 6 by pump 5 (it has integrated restrictor check valve) from reducing agent tank 2, and delivers to metering valve 3 by pipe-line system under stress.In order to regulate pressure, be provided with throttle orifice 7, its following current is arranged in reducing agent tank 2 before reflow pipe 8.In order to connect MEDIA FLOW, be provided with No. 4/2 valve 9, it is the same with pump 5 is controlled by controller 4.In order to monitor force, in the pipeline between No. 4/2 valve 9 and metering valve 3, pressure transducer 10 is set.In this embodiment, transfer pump 5, No. 4/2 valve 9 and pressure transducer 10 fit together in shell 11, are configured to so-called conveyor module.Length of pipe between conveyor module 11 and metering valve 3 such as can reach 4m.Usually there is in pressure piping between pump 5 and metering valve 3 pressure of about 5bar.The quick connector that required different hose connectors are normally made up of plastics.These flexible pipes are also made of plastics usually, therefore due to aging, setup error or damage and may cause blow-by or leakage.
By the present invention, attempt, in the resorption pattern of SCR catalyst system 1, to set up negative pressure when getting around throttle orifice 7, and observe whether by way of expectations foundation or the performance of this negative pressure.Illustrate the MEDIA FLOW in backflow model in fig. 2, this backflow model uses by the present invention.For this reason, No. 4/2 valve 9 is switched to resorption pattern, and therefore medium is released from the pipe-line system between metering valve 3 and conveyor module 11 when pump 5 operates.In the downstream of pump 5, medium leads to back reflow pipe 8 and pumping tube 6 leads back in reducing agent tank 2.Therefore between metering valve 3 and pump 5, set up negative pressure, this negative pressure utilizes by the present invention.In this pipe-line system, be provided with pressure transducer 10, it can detect one or more measured values of whether about pressure.Therefore can detected pressures, such as, as the oscillogram of pressure sensor voltage in time variations.
Fig. 3 shows, when implementing by method of the present invention, and the exemplary experiential oscillogram of pressure change.Region A in oscillogram top shows pressure sensor signal, as the time variations of pressure sensor voltage.This signal changes between 0bar and-0.5bar.In the B of oscillogram bottom, show the control of pump motor.Portion's section a) reflects system before starting by method of the present invention.This system is not in pressure under this, and pressure sensor signal is about 0bar.When metering valve cuts out, Ba 4/2 road Vavle switching is resorption pattern and after control pump motor, normally functioning SCR catalyst system can set up the negative pressure of Da Yue-0.5bar constantly.At portion section c) in close pump motor and do not change No. 4/2 valve resorption setting after, this negative pressure is kept.Infer thus, this system be sealing and normally functioning.In normally functioning system, open metering valve and negative pressure should be able to be made suddenly to be down to about 0bar (portion section d).Corresponding signal is there will be when system is damaged suddenly.Portion section e) show signal intensity, No. 4/2 valve is set in resorption pattern in this signal intensity, and transfer pump operates when metering valve is closed.The negative pressure set up is far from being enough.Deducibility goes out in this case, SCR catalyst system have reveal or packing less.
Do not need installation elements extraly just can detect the fault in SCR catalyst system by the advantage of method of the present invention.Another advantage is, there will not be excessive aqueous solution of urea, there will be this situation in the method known from prior art, and wherein this system loads for realizing diagnostic purpose superpressure.
By pressing method of the present invention, detect by pressure sensor signal, whether SCR catalyst system can normally work in sealing and in the element of conveyor module, and described pressure sensor signal shows the foundation of negative pressure in pipe-line system and change.As long as no the negative pressure setting up expection, then such as transfer pump may be out of order, and the restrictor check valve of transfer pump may be packing less, and No. 4/2 valve may be out of order or block, or metering valve may be out of order or block.In addition, reveal by determining by method of the present invention.Therefore such as can detect the functional of single valve thus, namely control described valve in enforcement by one or many during method of the present invention.
In order to implement by method of the present invention, multi-way valve is such as changeable is resorption pattern, and controls the motor of transfer pump when metering valve is opened.Set up negative pressure at this, thus deducibility goes out, multi-way valve and pump motor are normally functioning.And then can control or close metering valve.If metering valve is normally functioning, then this point should be able to cause the enhancing of negative pressure.Open the unexpected reduction that metering valve should be able to cause negative pressure.In this change of negative pressure, it is all normally functioning that deducibility goes out all elements mentioned, and pipe-line system is sealing.
Fig. 4 shows another oscillogram, it illustrates and implements by the change of pressure sensor signal during method of the present invention, observe in this method and monitor medium from the resorption process pipeline by change of the present invention.The change of pressure sensor voltage is again illustrated in the A of top.The control of also pump motor shown in the B of bottom.Portion's section a) shows in the sensor signal by method start time of the present invention.At portion section b) in illustrated, realize resorption pattern when motor starts by switching No. 4/2 valve.Metering valve opens.Can see the foundation of negative pressure at this, but this negative pressure does not reach 0.5bar (as shown in Figure 3), because compared with Fig. 3, at portion section b) in metering valve be open.In this stage, medium is drawn back in reducing agent tank from pipe-line system.Have little pressure peak in this confirmation, it is produced by the motion of diaphragm type pump or transfer pump.This resorption pattern is at portion section c) middle maintenance.Metering valve open and motor rotation time, No. 4/2 valve also remains in resorption pattern.But now, all media are all taken away, and steam bubble enters in pump case by the metering valve opened, and therefore pressure can rise.This is the mark that resorption process closes to an end.At portion section d) in, pressure is transferred to slightly high, thick-and-thin level again when resorption pattern remains in operation.Now medium is taken away completely.Produce pressure peak by diaphragm type pump no longer can determine, because no longer include medium to be arranged in pipeline.By in resorption process or observe the change of negative pressure in resorption pattern, can observe definitely, how resorption process carries out, or when resorption process terminates, and namely all media are all extracted out from pipe-line system.By the present invention to negative pressure observe also allow monitoring medium from the resorption pipe-line system, to confirm not having medium to stay in pipeline, may cause when medium freezes damage.
Claims (8)
1. monitor the method as the function of the SCR catalyst system (1) of the exhausted gas post-processing system of internal-combustion engine for one kind, wherein SCR catalyst system comprises at least one transfer pump (5), at least one multi-way valve (9), at least one metering valve (3) and at least one pressure transducer (10), it is characterized in that, in the resorption pattern of SCR catalyst system (1), the negative pressure that at least one measured value by pressure transducer (10) is observed in SCR catalyst system is set up, and when the reference value of at least one measured value described and expection has deviation, then deducibility goes out the capability error of SCR catalyst system (1).
2. by method according to claim 1, it is characterized in that, be resorption Schema control multi-way valve (9), and therefore when controlling transfer pump (5), medium is released from the pipeline of SCR catalyst system (1).
3., by method described in claim 1 or 2, it is characterized in that, before resorption pattern or period at least temporarily closes described at least one metering valve (3).
4. by the method described in claim 1 or 2, it is characterized in that, detect the sealing of SCR catalyst system (1).
5. by the method described in claim 1 or 2, it is characterized in that, detect the functional of described at least one metering valve (3).
6. by the method described in claim 1 or 2, it is characterized in that, detect the functional of described at least one transfer pump (5).
7. by the method described in claim 1 or 2, it is characterized in that, detect the functional of described at least one multi-way valve (9).
8. by method according to claim 2, it is characterized in that, detect the normal change of resorption process.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009029408.2A DE102009029408B4 (en) | 2009-09-14 | 2009-09-14 | Method for monitoring the function of an SCR catalyst system |
| DE102009029408.2 | 2009-09-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102022168A CN102022168A (en) | 2011-04-20 |
| CN102022168B true CN102022168B (en) | 2015-01-28 |
Family
ID=43571026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010283974.7A Active CN102022168B (en) | 2009-09-14 | 2010-09-13 | Method of monitoring function of selective catalytic reaction (SCR) catalyst |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN102022168B (en) |
| DE (1) | DE102009029408B4 (en) |
| FR (1) | FR2950106B1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011081628A1 (en) | 2011-08-26 | 2013-02-28 | Robert Bosch Gmbh | Dosing system for a liquid reducing agent |
| DE102011088217A1 (en) | 2011-12-12 | 2013-06-13 | Robert Bosch Gmbh | Dosing arrangement for a liquid exhaust aftertreatment agent and dosing |
| DE102011088221A1 (en) | 2011-12-12 | 2013-06-13 | Robert Bosch Gmbh | Dosing arrangement for a liquid exhaust aftertreatment agent and dosing |
| JP5914151B2 (en) * | 2012-05-09 | 2016-05-11 | ボッシュ株式会社 | Reducing agent injection valve abnormality detection device and reducing agent supply device |
| US9546585B2 (en) * | 2013-02-27 | 2017-01-17 | Cummins Ip, Inc. | Apparatus, method, and system for diagnosing reductant delivery performance |
| DE102013204686A1 (en) | 2013-03-18 | 2014-09-18 | Robert Bosch Gmbh | Method and device for determining dosing quantity deviations of an SCR catalyst |
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| CN102022168A (en) | 2011-04-20 |
| DE102009029408B4 (en) | 2023-10-19 |
| DE102009029408A1 (en) | 2011-03-17 |
| FR2950106B1 (en) | 2016-06-10 |
| FR2950106A1 (en) | 2011-03-18 |
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