CN111441846A - Method and device for correcting urea injection amount of SCR (Selective catalytic reduction) system and SCR system - Google Patents
Method and device for correcting urea injection amount of SCR (Selective catalytic reduction) system and SCR system Download PDFInfo
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- CN111441846A CN111441846A CN202010232945.1A CN202010232945A CN111441846A CN 111441846 A CN111441846 A CN 111441846A CN 202010232945 A CN202010232945 A CN 202010232945A CN 111441846 A CN111441846 A CN 111441846A
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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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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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- 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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- 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 the technical field of diesel engine SCR systems, and discloses a method, a device and a system for correcting urea injection quantity of an SCR system, wherein the method comprises the following steps: configuring a data table MAP of a correction factor of urea injection quantity according to the urea injection quantity and urea temperature change; configuring a corrected value curve CUR of the SCR conversion efficiency; the method comprises the steps of obtaining urea injection quantity Uree _ dm through an SCR system front end module, obtaining temperature data UTnk _ T of urea through a urea box sensor, inquiring a data table MAP, inquiring a correction value curve CUR, calculating to obtain corrected urea injection quantity Uree _ dm3, and obtaining a small output result of Uree _ dm3 and Uree _ dm. Two correction parameters influenced by the temperature of the urea solution are introduced to correct the SCR conversion efficiency and the urea injection amount, so that the urea crystallization caused by the unreasonable urea injection amount is avoided. Because urea injection quantity is finely corrected, urea is fully hydrolyzed, the risk of urea crystallization is low, and the overall performance of the SCR system is more stable.
Description
Technical Field
The invention relates to an SCR system of a diesel engine, in particular to a method and a device for correcting urea injection quantity of the SCR system and the SCR system.
Background
The urea injection quantity of the SCR system of the diesel engine mainly considers factors such as upstream NOx, temperature, gas space velocity, ammonia storage, NO2/NOx ratio, hardware aging degree and the like, and the influence of the temperature of a urea solution on the urea injection quantity is not considered in the conventional strategy. The urea solution with lower temperature absorbs the tail gas temperature to reduce the temperature of the SCR, which not only affects the hydrolysis effect of the urea, but also affects the NOx conversion efficiency of the SCR, and both affect the urea injection amount, thereby causing unreasonable injected urea and increasing the risk of SCR urea crystallization.
When the temperature of the urea with the concentration of 32.5% is higher than-11 ℃, the urea begins to melt into liquid, and the urea which can be absorbed by a urea pump is hydrolyzed by utilizing high-temperature tail gas in SCR; the low temperature urea solution absorbs a large amount of heat, resulting in insufficient urea hydrolysis, which affects the conversion efficiency of the SCR and thus the urea injection amount.
Disclosure of Invention
The invention provides a method and a device for correcting urea injection quantity of an SCR system and the SCR system, and solves the problems of inaccurate urea injection quantity and high urea crystallization risk in the prior art.
The technical scheme of the invention is realized as follows: a method for correcting urea injection quantity of an SCR system comprises the following steps:
acquiring a correction factor of urea injection quantity related to the urea injection quantity and the urea temperature, and configuring a data table MAP of the correction factor of the urea injection quantity according to the urea injection quantity and the urea temperature;
acquiring a corrected value curve of NOx conversion efficiency according to urea temperature change, and configuring a corrected value curve CUR of SCR conversion efficiency;
acquiring urea injection quantity Ure _ dm by an SCR system front-end module, acquiring temperature data UTnk _ T of urea by a urea box sensor, and inquiring the data table MAP to obtain a correction factor Fac1 corresponding to the urea injection quantity Ure _ dm and the urea temperature UTnk _ T;
inquiring the correction value curve CUR to obtain a correction value Fac2 of the SCR conversion efficiency corresponding to the urea temperature UTnk _ T;
correction of urea injection quantity: the corrected SCR conversion efficiency Fac3 is a correction Fac2 × SCR conversion efficiency SCR _ eta; the corrected urea injection quantity uredm 3 is the corrected SCR conversion efficiency Fac3 urea injection quantity uredm correction factor Fac 1;
the smaller value of the corrected urea injection quantity urejdm 3 and the urea injection quantity urejdm acquired by the SCR system front end module is output as a final correction value urejdm 4 of the urea injection quantity.
Preferably, the correction factor of the urea injection amount is larger than zero and smaller than 1.
Preferably, the corrected value of the SCR conversion efficiency is greater than zero and less than 1.
Preferably, the correction factor of the urea injection amount is formed by data or a curve which is obtained by an SCR system front-end module through experimental simulation or directly input through an input device.
As a preferable technical scheme, a corrected value curve of the SCR conversion efficiency according to the urea temperature change is obtained through experimental simulation by an SCR system front-end module, or is formed through data or a curve directly input by an input device.
As a preferred technical scheme, the data table MAP corresponds to the engine model and the SCR system thereof one by one.
An apparatus for correcting urea injection amount of an SCR system, comprising:
the data table configuration module is used for configuring a data table MAP of the correction factor of the urea injection quantity according to the urea injection quantity and the urea temperature through the acquired correction factor of the urea injection quantity related to the urea injection quantity and the urea temperature; configuring a corrected value curve CUR of the SCR conversion efficiency according to the corrected value curve of the obtained NOx conversion efficiency according to the urea temperature change;
the parameter acquisition module is used for acquiring urea injection quantity Uree _ dm from the front end module of the SCR system and acquiring the temperature of urea by the urea box;
the query module is used for acquiring a correction factor Fac1 corresponding to the urea injection quantity Uree _ dm and the urea temperature UTnk _ T from the data table MAP and acquiring a corrected value Fac2 of the SCR conversion efficiency corresponding to the urea temperature UTnk _ T from a corrected value curve CUR;
the calculation module is used for calculating a corrected urea injection quantity Ure _ dm3 according to the urea injection quantity correction factor Fac1, the corrected SCR conversion efficiency Fac2, the SCR conversion efficiency SCR _ eta and the urea injection quantity Ure _ dm;
and the comparison module compares the calculated corrected urea injection quantity Ure _ dm3 with the urea injection quantity Ure _ dm acquired from the SCR system front-end module and outputs a smaller value as a final correction value Ure _ dm4 of the urea injection quantity.
An SCR system applies the correction method of the urea injection amount of the SCR system.
The invention has the beneficial effects that: the urea injection quantity of the SCR system of the existing diesel engine is mainly calculated by factors such as upstream NOx, temperature, gas space velocity, ammonia storage, NO2/NOx ratio, hardware aging degree and the like. The urea solution temperature affects the urea injection quantity, and the urea solution with lower temperature absorbs the tail gas temperature to reduce the temperature of the SCR, so that the hydrolysis effect of the urea can be affected, and the NOx conversion efficiency of the SCR can also be affected.
Because urea injection quantity is finely corrected, urea is fully hydrolyzed, SCR conversion efficiency is improved, urea crystallization risk is low, and the overall performance of an SCR system is more stable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic block diagram of an embodiment of the present invention;
fig. 2 is a flowchart of the operation of the 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, rather than all of the embodiments, and the description of the embodiments is provided to help understanding of the present invention, but not to limit the present invention. 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.
In the description of the embodiments herein, "/" means "or" unless otherwise specified, for example, a/B may mean a or B; "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality" means two or more than two.
In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present application, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1, the present invention relates to a method for correcting urea injection amount of an SCR system, which is based on the following points:
(1) the urea temperature sensor is now used for urea thawing, and the urea temperature measurement value can be used for correcting urea injection without adding an additional sensor;
(2) the heat absorbed during urea hydrolysis is not only related to the urea temperature but also related to the urea injection amount, and the specific value is calibrated according to different engines and SCR;
(3) the temperature after urea hydrolysis also affects the conversion efficiency of the SCR, and the specific values are calibrated according to different engines and SCRs.
The method specifically comprises the following steps:
step 1: and acquiring a correction factor of the urea injection quantity related to the urea injection quantity and the urea temperature, and configuring a data table MAP of the correction factor of the urea injection quantity according to the urea injection quantity and the urea temperature. The correction factor for the urea injection amount is a constant greater than zero and less than 1.
And acquiring a correction value curve of the NOx conversion efficiency according to the urea temperature change, and configuring a correction value curve CUR of the SCR conversion efficiency, wherein the correction value of the SCR conversion efficiency is a constant which is larger than zero and smaller than 1.
In this embodiment, in the data table MAP, the correction factors of the urea injection amount corresponding to the urea injection amount and the urea temperature are data or curves obtained and summarized through experiments and simulations, or are data tables or curves directly introduced through an input device.
In the corrected value curve CUR of the SCR conversion efficiency, the corrected value curve of the NOx conversion efficiency according to the change in the urea temperature is also data or a curve obtained by experiments and simulations, or may be a data table imported by an input device.
Step 2: acquiring urea injection quantity Ure _ dm by an SCR system front-end module, acquiring temperature data UTnk _ T of urea by a urea box sensor, and inquiring a data table MAP to obtain a correction factor Fac1 corresponding to the urea injection quantity Ure _ dm and the urea temperature UTnk _ T;
and inquiring a correction value curve CUR to obtain a correction value Fac2 of the SCR conversion efficiency corresponding to the urea temperature UTnk _ T.
In the present embodiment, a unique correction factor Fac1 is associated with the data table MAP based on the acquired urea injection quantity urem _ dm and temperature data UTnk _ T, and a unique correction value Fac2 can be acquired on the correction value curve CUR.
And step 3, correcting the urea injection amount:
the corrected SCR conversion efficiency Fac3 is a correction Fac2 × SCR conversion efficiency SCR _ eta;
the urea injection quantity urem _ dm2 related to the SCR conversion efficiency is a corrected SCR conversion efficiency Fac3 and urea injection quantity urem _ dm;
the corrected urea injection quantity uredm 3 is the SCR conversion efficiency related urea injection quantity uredm 2 correction factor Fac1, i.e., Fac3 uredm Fac 1.
And 4, step 4: and comparing the corrected urea injection quantity Ure _ dm3 with the urea injection quantity Ure _ dm obtained by the front end module of the SCR system, and outputting a value with a smaller urea injection quantity as a final correction value Ure _ dm4 of the urea injection quantity in order to ensure the effectiveness of the urea injection quantity correction value.
The SCR system injects urea based on the received final correction value uredm 4 of the urea injection amount.
The invention also relates to a device for correcting the urea injection quantity of the SCR system, which comprises:
the data table configuration module is used for configuring a data table MAP of the correction factor of the urea injection quantity according to the urea injection quantity and the urea temperature through the acquired correction factor of the urea injection quantity related to the urea injection quantity and the urea temperature; configuring a corrected value curve CUR of the SCR conversion efficiency according to the corrected value curve of the urea temperature change of the obtained NOx conversion efficiency;
the parameter acquisition module is used for acquiring urea injection quantity Uree _ dm from the front end module of the SCR system and acquiring the temperature of urea by the urea box;
the query module is used for acquiring a correction factor Fac1 corresponding to the urea injection quantity Uree _ dm and the urea temperature UTnk _ T from the data table MAP and acquiring a corrected value Fac2 of the SCR conversion efficiency corresponding to the urea temperature UTnk _ T from a corrected value curve CUR;
the calculation module is used for calculating a corrected urea injection quantity Ure _ dm3 according to the urea injection quantity correction factor Fac1, the corrected SCR conversion efficiency Fac2, the SCR conversion efficiency SCR _ eta and the urea injection quantity Ure _ dm;
and the comparison module compares the calculated corrected urea injection quantity Ure _ dm3 with the urea injection quantity Ure _ dm acquired from the SCR system front-end module, and outputs a smaller value to the SCR system as a final correction value Ure _ dm4 of the urea injection quantity.
An SCR system applies the correction method of the urea injection amount of the SCR system.
The method for correcting the urea injection quantity can be applied to an SCR system, and can also be applied to a front-end module of the SCR system to send the final correction value of the urea injection quantity to the SCR system.
In the invention, the data table MAP and the correction value curve CUR are related to the type of the engine and the SCR system, and the data table MAP and the correction value curve CUR corresponding to different engine types and SCR systems are different, so the data table MAP and the correction value curve CUR need to be configured before the urea injection quantity is corrected.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method for correcting the urea injection quantity of an SCR system is characterized by comprising the following steps:
acquiring a correction factor of urea injection quantity related to the urea injection quantity and the urea temperature, and configuring a data table MAP of the correction factor of the urea injection quantity according to the urea injection quantity and the urea temperature;
acquiring a corrected value curve of NOx conversion efficiency according to urea temperature change, and configuring a corrected value curve CUR of SCR conversion efficiency;
acquiring urea injection quantity Ure _ dm by an SCR system front-end module, acquiring temperature data UTnk _ T of urea by a urea box, and inquiring the data table MAP to obtain a correction factor Fac1 corresponding to the urea injection quantity Ure _ dm and the urea temperature UTnk _ T;
inquiring the correction value curve CUR to obtain a correction value Fac2 of the SCR conversion efficiency corresponding to the urea temperature UTnk _ T;
correction of urea injection quantity: the corrected SCR conversion efficiency Fac3 is a correction Fac2 × SCR conversion efficiency SCR _ eta; the corrected urea injection quantity uredm 3 is the corrected SCR conversion efficiency Fac3 urea injection quantity uredm correction factor Fac 1;
the smaller value of the corrected urea injection quantity urejdm 3 and the urea injection quantity urejdm acquired by the SCR system front end module is output as a final correction value urejdm 4 of the urea injection quantity.
2. The method for correcting the urea injection quantity of the SCR system according to claim 1, characterized in that: the correction factor for the urea injection amount is greater than zero and less than 1.
3. The method for correcting the urea injection quantity of the SCR system according to claim 1, characterized in that: and the corrected value of the SCR conversion efficiency is larger than zero and smaller than 1.
4. The method for correcting the urea injection quantity of the SCR system according to claim 1, characterized in that: the correction factor of the urea injection quantity is formed by data or a curve which is obtained through experimental simulation of an SCR system front-end module or is directly input through an input device.
5. The method for correcting the urea injection quantity of the SCR system according to claim 1, characterized in that: the data table MAP and the correction value curve CUR correspond to the engine model and the SCR system thereof one to one.
6. The method for correcting the urea injection quantity of the SCR system according to claim 1, characterized in that: the corrected value curve of the SCR conversion efficiency according to the urea temperature change is obtained through experimental simulation by an SCR system front-end module, or is formed through data or a curve directly input by input equipment.
7. An apparatus for correcting an urea injection amount of an SCR system, comprising:
the data table configuration module is used for configuring a data table MAP of the correction factor of the urea injection quantity according to the urea injection quantity and the urea temperature through the acquired correction factor of the urea injection quantity related to the urea injection quantity and the urea temperature; configuring a corrected value curve CUR of the SCR conversion efficiency according to the corrected value curve of the obtained NOx conversion efficiency according to the urea temperature change;
the parameter acquisition module is used for acquiring urea injection quantity Uree _ dm from the front end module of the SCR system and acquiring the temperature of urea by the urea box;
the query module is used for acquiring a correction factor Fac1 corresponding to the urea injection quantity Uree _ dm and the urea temperature UTnk _ T from the data table MAP and acquiring a corrected value Fac2 of the SCR conversion efficiency corresponding to the urea temperature UTnk _ T from a corrected value curve CUR;
the calculation module is used for calculating a corrected urea injection quantity Ure _ dm3 according to the urea injection quantity correction factor Fac1, the corrected SCR conversion efficiency Fac2, the SCR conversion efficiency SCR _ eta and the urea injection quantity Ure _ dm;
and the comparison module compares the calculated corrected urea injection quantity Ure _ dm3 with the urea injection quantity Ure _ dm acquired from the SCR system front-end module and outputs a smaller value as a final correction value Ure _ dm4 of the urea injection quantity.
8. An SCR system, characterized by: the method for correcting the urea injection quantity of the SCR system according to any one of claims 1 to 6 is applied.
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| CN202010232945.1A CN111441846A (en) | 2020-03-28 | 2020-03-28 | Method and device for correcting urea injection amount of SCR (Selective catalytic reduction) system and SCR system |
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| CN112963229A (en) * | 2021-03-19 | 2021-06-15 | 南京依柯卡特排放技术股份有限公司 | Urea residual quantity monitoring and early warning system and method for diesel engine truck |
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| CN114233445A (en) * | 2021-12-13 | 2022-03-25 | 潍柴动力股份有限公司 | Method and device for detecting urea crystals of SCR system |
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| CN114233445B (en) * | 2021-12-13 | 2023-03-21 | 潍柴动力股份有限公司 | Method and device for detecting urea crystals of SCR system |
| CN115263498A (en) * | 2022-07-22 | 2022-11-01 | 东风汽车股份有限公司 | Method, recording medium and system for controlling urea crystallization in process of removing nitrogen oxides by adding urea into diesel vehicle |
| CN115263498B (en) * | 2022-07-22 | 2023-04-25 | 东风汽车股份有限公司 | Method, recording medium and system for controlling urea crystallization in process of adding urea to remove nitrogen oxides in diesel vehicle |
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