CN112483225B - Method and equipment for reducing ammonia consumption of SCR (selective catalytic reduction) - Google Patents
Method and equipment for reducing ammonia consumption of SCR (selective catalytic reduction) Download PDFInfo
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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]
- F01N3/2073—Selective catalytic reduction [SCR] with means for generating a reducing substance from the exhaust gases
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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
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- G16C20/00—Chemoinformatics, i.e. ICT specially adapted for the handling of physicochemical or structural data of chemical particles, elements, compounds or mixtures
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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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- 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
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Abstract
The invention relates to the field of engines, and discloses a method and equipment for reducing SCR ammonia consumption, wherein the method for reducing the SCR ammonia consumption comprises the following steps: in the process of converting the nitrogen oxides, acquiring the actual ammonia nitrogen consumption ratio of each different working condition point; wherein the actual ammonia nitrogen consumption ratio is determined according to ammonia consumption and nitrogen oxide conversion rate; sequentially taking each different working condition point as a target working condition point according to the actual ammonia nitrogen consumption ratio, and obtaining a first threshold value and a second threshold value of the nitrogen oxide conversion rate of the target working condition point; and determining the conversion rate of the nitrogen oxides at the target working condition point according to the first threshold value and the second threshold value of the conversion rate of the nitrogen oxides. For reducing ammonia consumption while ensuring emission legislation limits.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method and equipment for reducing the consumption of SCR ammonia.
Background
Pure ammonia gas is required for SCR (Selective Catalytic Reduction), and for SCR, urea has the highest operating cost, ammonia water has the second lowest cost, and liquid ammonia is the least expensive. However, liquid ammonia is most dangerous and urea is safest. The weight conversion of urea to ammonia by pyrolysis was 1.76:1, that is 1.76kg of urea could be converted to 1kg of ammonia. Ammonia water has an ammonia concentration of only 20 to 25% and is therefore inexpensive, while liquid ammonia is much more expensive than urea.
In China, the project of urea as an SCR reducing agent is gradually increased, and the main reason is safety. However, in the current SCR, the urea consumption is relatively high, and NH3 leakage is relatively high, which increases the cost in the SCR reaction process.
Disclosure of Invention
The invention discloses a method and equipment for reducing the consumption of SCR ammonia, which are used for reducing the consumption of ammonia while ensuring the limit value of an emission regulation.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, the present invention provides a method for reducing ammonia consumption of an SCR, comprising:
in the process of converting the nitrogen oxides, acquiring the actual ammonia nitrogen consumption ratio of each different working condition point; wherein the actual ammonia nitrogen consumption ratio is determined according to ammonia consumption and nitrogen oxide conversion rate;
sequentially taking each different working condition point as a target working condition point according to the actual ammonia nitrogen consumption ratio, and obtaining a first threshold value and a second threshold value of the nitrogen oxide conversion rate of the target working condition point;
and determining the conversion rate of the nitrogen oxides at the target working condition point according to the first threshold value and the second threshold value of the conversion rate of the nitrogen oxides.
In the process of converting the nitrogen oxide, measuring actual ammonia nitrogen consumption ratios of all working condition points WHSC, ESC, NRSC or self-defined steady-state working condition points, and then sequencing the actual ammonia nitrogen consumption ratios from small to large, wherein the actual ammonia nitrogen consumption ratios are determined according to the ammonia consumption and the nitrogen oxide conversion rate, so that the lower the actual ammonia nitrogen consumption ratios are, the higher the nitrogen oxide conversion rate is, the smaller the ammonia consumption is; the conversion rate of the nitrogen oxides even reaches the limit conversion rate of the point, so that the potential of the point is fully exerted, the conversion rates of the nitrogen oxides of different working conditions are changed from small to large, and the comprehensive ammonia consumption of the circulating working conditions reaches or approaches to the minimum value on the premise of ensuring that the emission meets the requirements of the regulations.
Optionally, the first threshold is specifically obtained by:
and taking an upper limit value in a value interval of the nitrogen oxide conversion rate of the target working condition point as a first threshold value.
Optionally, the second threshold is specifically obtained by:
and when the nitrogen oxide conversion rate of the other working condition points except the target working condition point is the lower limit value, taking the corresponding upper limit value of the target working condition point as a second threshold value.
Optionally, the nox conversion at the target operating point is determined by:
and selecting the minimum value of the first threshold value and the second threshold value.
Optionally, the operating point is specifically determined by:
different operating points are determined according to different exhaust temperatures and different operating parameters of the engine.
In a second aspect, the present invention provides an apparatus for reducing ammonia consumption in an SCR, the apparatus comprising: a processor and a memory, wherein the memory stores program code that, when executed by the processor, causes the processor to:
in the process of converting the nitrogen oxides, acquiring the actual ammonia nitrogen consumption ratio of each different working condition point; wherein the actual ammonia nitrogen consumption ratio is determined according to ammonia consumption and nitrogen oxide conversion rate;
and sequentially taking each different working condition point as a target working condition point according to the actual ammonia nitrogen consumption ratio, acquiring a first threshold and a second threshold of the conversion rate of the nitrogen oxides of the target working condition point, and determining the conversion rate of the nitrogen oxides of the target working condition point according to the first threshold and the second threshold of the conversion rate of the nitrogen oxides.
Optionally, the processor is configured to determine the first threshold, and specifically obtain the first threshold by:
and taking an upper limit value in a value interval of the nitrogen oxide conversion rate of the target working condition point as a first threshold value.
Optionally, the processor is configured to determine the second threshold, and specifically obtain the second threshold by:
and when the nitrogen oxide conversion rate of the other working condition points except the target working condition point is the lower limit value, taking the corresponding upper limit value of the target working condition point as a second threshold value.
Optionally, the processor determines the nox conversion at the target operating point by:
and selecting the minimum value of the first threshold value and the second threshold value.
Optionally, the processor is configured to determine the operating point, specifically by:
different operating points are determined according to different exhaust temperatures and different operating parameters of the engine.
In a third aspect, the present invention provides a computer-readable storage medium, in which a computer program is stored, and when the computer program is executed by a processor, the method for reducing the consumption of SCR ammonia in the first aspect is implemented.
For technical effects brought by any one implementation manner of the second aspect and the third aspect, reference may be made to technical effects brought by a corresponding implementation manner of the first aspect, and details are not described here.
Drawings
FIG. 1 is a flow chart of a method for reducing SCR ammonia consumption according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of actual ammonia nitrogen consumption ratios at different operating points according to an embodiment of the present invention;
FIG. 3 shows the actual ammonia nitrogen consumption ratio of an engine at different operating points according to an embodiment of the present invention;
FIG. 4 shows the actual ammonia nitrogen consumption ratio of another engine at different operating points according to the embodiment of the present invention;
FIG. 5 is a schematic diagram of an apparatus for reducing the consumption of SCR ammonia according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of another apparatus for reducing SCR ammonia consumption according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a method for reducing ammonia consumption of an SCR, the method including the following steps:
s101: in the process of converting the nitrogen oxides, acquiring the actual ammonia nitrogen consumption ratio of each different working condition point; wherein the actual ammonia nitrogen consumption ratio is determined according to ammonia consumption and nitrogen oxide conversion rate;
in one embodiment, the conversion of nitrogen oxides is performed by obtaining the ammonia consumption and the conversion of nitrogen oxides, specifically, the ammonia consumption is the molar mass of ammonia used, and the conversion of nitrogen oxides is the ratio of the amount of nitrogen oxides reduced after passing through the SCR catalyst to the amount of nitrogen oxides before the SCR reaction.
S102: sequentially taking each different working condition point as a target working condition point according to the actual ammonia nitrogen consumption ratio, and obtaining a first threshold value and a second threshold value of the nitrogen oxide conversion rate of the target working condition point;
s103: and determining the conversion rate of the nitrogen oxides at the target working condition point according to the first threshold value and the second threshold value of the conversion rate of the nitrogen oxides.
As shown in fig. 2, the actual ammonia nitrogen consumption ratios of all the working condition points WHSC, ESC, NRSC or self-defined steady-state working condition points are measured, and the actual ammonia nitrogen consumption ratios of all the working condition points are ranked from small to large, for example rA50< rB50< rB75< … … < rA 100; the method comprises the steps of obtaining a first threshold and a second threshold of the nitrogen oxide conversion rate of a working condition point A50 from an actual ammonia nitrogen consumption ratio minimum point A50, determining the nitrogen oxide conversion rate of the working condition point A50 according to the first threshold and the second threshold, and after the working condition point A50 is determined, sequentially aiming at the nitrogen oxide conversion rates of B50 and B75 … … A100 according to the fact that the actual ammonia nitrogen consumption ratio of each working condition point is from small to large.
It should be noted here that, in the process of converting nitrogen oxides, actual ammonia nitrogen consumption ratios of all working condition points WHSC, ESC, NRSC or self-defined steady-state working condition points are measured, and then the actual ammonia nitrogen consumption ratios are sorted from small to large, and the actual ammonia nitrogen consumption ratios are determined according to the ammonia consumption and the nitrogen oxide conversion rate, so that the lower the actual ammonia nitrogen consumption ratio is, the higher the nitrogen oxide conversion rate is, the smaller the ammonia consumption is; the conversion rate of the nitrogen oxides even reaches the limit conversion rate of the point, so that the potential of the point is fully exerted, the conversion rates of the nitrogen oxides of different working conditions are changed from small to large, and the comprehensive ammonia consumption of the circulating working conditions reaches or approaches to the minimum value on the premise of ensuring that the emission meets the requirements of the regulations.
Specifically, the first threshold is obtained specifically by:
and taking an upper limit value in a value interval of the nitrogen oxide conversion rate of the target working condition point as a first threshold value.
When the oxidation-reduction reaction of the nitrogen oxide is carried out at the target operating point, the conversion rate of the nitrogen oxide is in a certain range, namely, a certain value interval exists, and the upper limit value, namely the maximum value in the value interval is selected as the first threshold value.
For example, assuming that the target operating point is exemplified by A50, and rA50 is the conversion of NOx at the A50 operating point, the range of rA50 is 20% ≦ rA50 ≦ 50%, so 50% is selected here as the first threshold for A50.
Specifically, the second threshold is obtained specifically by:
and when the nitrogen oxide conversion rate of the other working condition points except the target working condition point is the lower limit value, taking the corresponding upper limit value of the target working condition point as a second threshold value.
When the other working condition points except the target working condition point carry out oxidation-reduction reaction on the nitrogen oxide, because the conversion rate of each working condition point to the nitrogen oxide is in a certain range, namely a certain value interval exists, the minimum value in the value interval is selected as the lower limit value of the other working condition points except the target working condition point; in order to ensure that the emission meets the requirements of the regulations, 100% conversion of nitrogen oxides is completed in the whole SCR oxidation-reduction reaction, when the lower limit values of the other points except the target working point are selected, one upper limit value corresponding to the target working point is a second threshold value.
The method for determining the second threshold will be exemplified below, assuming that the target operating points are a50 as an example, and assuming that the ranges of the conversion rates of nitrogen oxides of the operating points other than a50 are 10% rB50 to 50% and 15% rB75 to 70%, respectively, where rB50 and rB75 select the lower limit values, namely rB50 to 10% and rB75 to 15%, in order to ensure that 100% conversion of nitrogen oxides is completed in the entire SCR redox reaction, then rA50 to 75% between 1% and 10% and 15%, namely the second threshold of rA50 is 75%.
Having determined the first and second thresholds for the target operating point, the nox conversion for the target operating point is determined by:
and selecting the minimum value of the first threshold value and the second threshold value.
For ease of understanding, the determination of the NOx conversion at the target operating point is illustrated below: also taking point A50 as an example, first a threshold value for rA50 is determined, rA50 is the conversion of nitrogen oxides at the operating point A50, and the range of rA50 is 20% or more and rA50 or less and 50% or less, so that 50% is selected here as the first threshold value for A50. Next, a second threshold value for rA50 is determined, the ranges of the conversion rates for nitrogen oxides for the remaining operating points, excluding a50, being 10% rB50 50% and 15% rB75 70%, respectively, where rB50 and rB75 are selected to have lower limit values, namely rB50 10% and rB75 15%, and where rA50 is 75% to 1-10% -15% to ensure that 100% conversion of nitrogen oxides is completed throughout the SCR redox reaction, namely the second threshold value for rA50 is 75%. Finally, comparing the first threshold value and the second threshold value of A50, and selecting the smaller one of the first threshold value and the second threshold value as the nitrogen oxide conversion rate of A50, namely rA50 is 50%; the nitrogen oxide conversion at other points is determined in turn according to the above process.
After the conversion rates of the nitrogen oxides at different working condition points are determined, the design gives full play to the conversion rate of the nitrogen oxides at each working condition point, and the higher the conversion rate of the nitrogen oxides is, the more ammonia is consumed in the actual ammonia nitrogen consumption ratio.
Notably, the operating point is specifically determined by:
different operating points are determined according to different exhaust temperatures and different operating parameters of the engine.
Referring now to FIG. 3, various operating points of an engine type ESC; FIG. 4 is a diagram of actual ammonia nitrogen consumption ratios and nitrogen oxide conversion rates corresponding to different torque and rotation speeds at different operating points of a WHSC of another engine type, and it can be seen clearly from the diagram that at least different actual ammonia nitrogen consumption ratios are corresponding to different operating points, and the actual ammonia nitrogen consumption ratios are still in oscillation change, and the actual ammonia nitrogen consumption ratios are actual ammonia nitrogen consumption molar ratios.
As shown in fig. 5, an apparatus for reducing consumption of SCR ammonia according to an embodiment of the present invention includes: a processor 301 and a memory 302, wherein the memory 302 stores program code that, when executed by the processor, causes the processor to perform the following:
in the process of converting the nitrogen oxides, acquiring the actual ammonia nitrogen consumption ratio of each different working condition point; wherein the actual ammonia nitrogen consumption ratio is determined according to ammonia consumption and nitrogen oxide conversion rate;
and sequentially taking each different working condition point as a target working condition point according to the actual ammonia nitrogen consumption ratio, acquiring a first threshold and a second threshold of the conversion rate of the nitrogen oxides of the target working condition point, and determining the conversion rate of the nitrogen oxides of the target working condition point according to the first threshold and the second threshold of the conversion rate of the nitrogen oxides.
Optionally, the processor 301 is configured to determine the first threshold, and specifically obtain the first threshold by:
and taking an upper limit value in a value interval of the nitrogen oxide conversion rate of the target working condition point as a first threshold value.
Optionally, the processor 301 is configured to determine the second threshold, and specifically obtain the second threshold by:
and when the nitrogen oxide conversion rate of the other working condition points except the target working condition point is the lower limit value, taking the corresponding upper limit value of the target working condition point as a second threshold value.
Alternatively, the processor 301 determines the nox conversion at the target operating point by:
and selecting the minimum value of the first threshold value and the second threshold value.
Optionally, the processor 301 is configured to determine the operating point, specifically by:
different operating points are determined according to different exhaust temperatures and different operating parameters of the engine.
As shown in fig. 6, an apparatus for reducing consumption of SCR ammonia according to an embodiment of the present invention includes:
the obtaining module 401 obtains actual ammonia nitrogen consumption ratios of different working condition points in the process of converting the nitrogen oxides; wherein the actual ammonia nitrogen consumption ratio is determined according to ammonia consumption and nitrogen oxide conversion rate;
the conversion rate determining module 402 sequentially uses each of the different working condition points as a target working condition point according to the actual ammonia nitrogen consumption ratio, obtains a first threshold and a second threshold of the conversion rate of the nitrogen oxides of the target working condition point, and determines the conversion rate of the nitrogen oxides of the target working condition point according to the first threshold and the second threshold of the conversion rate of the nitrogen oxides.
In one possible implementation, the conversion rate determining module 402 obtains the first threshold by:
and taking an upper limit value in a value interval of the nitrogen oxide conversion rate of the target working condition point as a first threshold value.
In a possible implementation manner, the conversion rate determining module 402 obtains the second threshold specifically by:
and when the nitrogen oxide conversion rate of the other working condition points except the target working condition point is the lower limit value, taking the corresponding upper limit value of the target working condition point as a second threshold value.
In one possible implementation, the conversion determination module 402 determines the NOx conversion for the target operating point by:
and selecting the minimum value of the first threshold value and the second threshold value.
In one possible implementation manner, the obtaining module 401 specifically determines the operating point by:
different operating points are determined according to different exhaust temperatures and different operating parameters of the engine.
Embodiments of the present invention provide a computer-storable medium having stored thereon a computer program which, when executed by a processor, performs the steps of the vehicle deviation warning method as described above. The storable medium may be, among other things, a non-volatile storable medium.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A method of reducing SCR ammonia consumption, comprising:
in the process of converting the nitrogen oxides, acquiring the actual ammonia nitrogen consumption ratio of each different working condition point; wherein the actual ammonia nitrogen consumption ratio is determined according to ammonia consumption and nitrogen oxide conversion rate;
sequentially taking each different working condition point as a target working condition point according to the actual ammonia nitrogen consumption ratio, and obtaining a first threshold value and a second threshold value of the nitrogen oxide conversion rate of the target working condition point;
and determining the conversion rate of the nitrogen oxides at the target working condition point according to the first threshold value and the second threshold value of the conversion rate of the nitrogen oxides.
2. Method for reducing the consumption of SCR ammonia according to claim 1, characterized in that said first threshold is obtained in particular by:
and taking an upper limit value in a value interval of the nitrogen oxide conversion rate of the target working condition point as a first threshold value.
3. Method for reducing the consumption of SCR ammonia according to claim 1, characterized in that said second threshold is obtained in particular by:
and when the nitrogen oxide conversion rate of the other working condition points except the target working condition point is the lower limit value, taking the corresponding upper limit value of the target working condition point as a second threshold value.
4. Method for reducing the consumption of SCR ammonia according to any of claims 1 to 3, characterized in that the nox conversion at the target operating point is determined by:
and selecting the minimum value of the first threshold value and the second threshold value.
5. Method for reducing the consumption of SCR ammonia according to claim 1, characterized in that the operating point is determined in particular by:
different operating points are determined according to different exhaust temperatures and different operating parameters of the engine.
6. An apparatus for reducing ammonia consumption in an SCR, the apparatus comprising: a processor and a memory, wherein the memory stores program code that, when executed by the processor, causes the processor to:
in the process of converting the nitrogen oxides, acquiring the actual ammonia nitrogen consumption ratio of each different working condition point; wherein the actual ammonia nitrogen consumption ratio is determined according to ammonia consumption and nitrogen oxide conversion rate;
and sequentially taking each different working condition point as a target working condition point according to the actual ammonia nitrogen consumption ratio, acquiring a first threshold and a second threshold of the conversion rate of the nitrogen oxides of the target working condition point, and determining the conversion rate of the nitrogen oxides of the target working condition point according to the first threshold and the second threshold of the conversion rate of the nitrogen oxides.
7. Device for reducing the consumption of SCR ammonia according to claim 6, wherein said processor is configured to determine said first threshold value, in particular by:
and taking an upper limit value in a value interval of the nitrogen oxide conversion rate of the target working condition point as a first threshold value.
8. Device for reducing the consumption of SCR ammonia according to claim 6, wherein said processor is configured to determine said second threshold value by:
and when the nitrogen oxide conversion rate of the other working condition points except the target working condition point is the lower limit value, taking the corresponding upper limit value of the target working condition point as a second threshold value.
9. The apparatus to reduce consumption of SCR ammonia of any of claims 6-8, wherein the processor determines the NOx conversion at the target operating point by:
and selecting the minimum value of the first threshold value and the second threshold value.
10. The apparatus of reducing consumption of SCR ammonia of claim 6, wherein the processor is configured to determine operating points by:
different operating points are determined according to different exhaust temperatures and different operating parameters of the engine.
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| CN102230413A (en) * | 2011-05-20 | 2011-11-02 | 潍柴动力股份有限公司 | SCR (Selective Catalytic Reduction) control device, system and method thereof |
| CN102536395A (en) * | 2011-11-23 | 2012-07-04 | 潍柴动力股份有限公司 | Hybrid bus and SCR (selective catalytic reduction) heat management system of engine thereof |
| EP2890874B1 (en) * | 2012-08-31 | 2017-05-10 | Volvo Truck Corporation | Method and system for estimating reagent quality |
| CN110073086A (en) * | 2016-12-21 | 2019-07-30 | 珀金斯发动机有限公司 | A kind of improved selective catalytic reduction system operating |
| CN109681297A (en) * | 2018-11-22 | 2019-04-26 | 江苏大学 | A kind of motor exhaust urea injection apparatus and its control method |
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