CN109296425B - Ammonia gas injection amount control method based on SCR system - Google Patents

Ammonia gas injection amount control method based on SCR system Download PDF

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CN109296425B
CN109296425B CN201811550695.5A CN201811550695A CN109296425B CN 109296425 B CN109296425 B CN 109296425B CN 201811550695 A CN201811550695 A CN 201811550695A CN 109296425 B CN109296425 B CN 109296425B
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ammonia
scr system
conversion efficiency
efficiency
amount
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CN109296425A (en
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刘琦
王晓鹏
徐磊
曹明柱
赵小虎
王云鹏
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Anhui Jianghuai Automobile Group Corp
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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
    • 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
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/06—Adding substances to exhaust gases the substance being in the gaseous form
    • 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
    • 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 discloses an ammonia gas injection amount control method based on an SCR system, which comprises the following steps of controlling NH according to ammonia gas stored in the SCR system3Obtaining nitrogen oxides NOxThe model conversion efficiency of (3); according to nitrogen oxides NO at air inlet side of SCR systemxTo obtain nitrogen oxide NOxTarget transformation efficiency of (a); obtaining nitrogen oxides NOxActual conversion efficiency of; obtaining an efficiency deviation according to the actual conversion efficiency and the target conversion efficiency; performing a sum operation on the model conversion efficiency and the efficiency deviation to obtain the required conversion efficiency; obtaining ammonia NH according to the required conversion efficiency3The required injection amount of (3). The invention provides an ammonia gas injection amount control method based on an SCR system, and provides a method capable of balancing nitrogen oxide NOxEmission and ammonia NH3The target conversion efficiency of the leakage amount is subjected to efficiency compensation on the model conversion efficiency through the deviation efficiency between the target conversion efficiency and the actual conversion efficiency, so that the effect of compensating the NH of the ammonia gas is realized3Accurate control of the required injection quantity avoids ammonia NH3The problem of leakage contamination is caused by the excessively high injection amount.

Description

Ammonia gas injection amount control method based on SCR system
Technical Field
The invention relates to the technical field of automobiles, in particular to an ammonia gas injection amount control method based on an SCR system.
Background
In order to meet the national emission requirements of diesel engines, Selective Catalytic Reduction (SCR) systems are generally used to control the emissions of diesel engines. Wherein the SCR system utilizes ammonia injected into the exhaust gasGas (NH)3) To remove Nitrogen Oxides (NO) in exhaust gasX) Reducing the nitrogen into pollution-free nitrogen and water. But due to NH3Influence of injection quantity on NOXReduction efficiency, injection of too little NOXThe reduction efficiency is low, and the emission cannot be met; while excessive injection results in NH3Leakage, also polluting, so NH3Control of injection quantity is an important strategy for SCR system calibration. In the prior art, in order to improve the reaction efficiency of nitrogen oxide, NH is often caused3Excessive injection amount to cause NH3And (4) pollution.
Disclosure of Invention
The invention aims to provide an ammonia gas injection amount control method based on an SCR system, which aims to solve the problems in the prior art and avoid pollution caused by excessive ammonia gas injection while ensuring efficient reaction of nitrogen oxides.
The invention provides an ammonia gas injection amount control method based on an SCR system, which comprises the following steps:
according to ammonia NH stored in SCR system3Obtaining nitrogen oxides NOxThe model conversion efficiency of (3);
according to nitrogen oxide NO at air inlet side of SCR systemxTo obtain nitrogen oxide NOxTarget transformation efficiency of (a);
obtaining nitrogen oxides NOxActual conversion efficiency of;
obtaining an efficiency deviation according to the actual conversion efficiency and the target conversion efficiency;
summing the model conversion efficiency and the efficiency deviation to obtain the required conversion efficiency;
obtaining ammonia NH according to the required conversion efficiency3The required injection amount of (3).
The method for controlling the amount of ammonia injection based on the SCR system as described above, wherein it is preferable that the amount of ammonia NH stored in the SCR system is controlled according to the amount of ammonia NH stored in the SCR system3Obtaining nitrogen oxides NOxBefore the model of (2) transforms efficiency, the method further comprises:
according to nitrogen at air inlet side of SCR systemOxide NOxTo obtain ammonia NH3The theoretical injection amount of (4);
according to nitrogen oxides NO on the exhaust side of the SCR systemxTo obtain ammonia NH3The amount of leakage of;
according to nitrogen oxides NOxAmmonia NH consumed in chemical reactions3To obtain ammonia NH3The amount of conversion of (a);
according to the ammonia NH3Obtaining ammonia NH by the theoretical injection amount, leakage amount and conversion amount3An amount stored in the SCR system.
The SCR system-based ammonia gas injection amount control method as described above, wherein preferably, NH is obtained according to the following formula3Amount stored in the SCR system:
Figure BDA0001910561730000021
wherein the content of the first and second substances,
Figure BDA0001910561730000022
indicating NH in SCR systems3T represents nitrogen oxide NOxThe time elapsed from entering the SCR system to exiting the SCR system after the reaction is complete,
Figure BDA0001910561730000023
denotes ammonia NH3The amount of injection on the intake side of the SCR system,
Figure BDA0001910561730000024
denotes ammonia NH3The amount of leakage at the exhaust side of the SCR system,
Figure BDA0001910561730000025
denotes ammonia NH3In the presence of nitrogen oxides NOxThe amount of conversion in the reaction.
The method for controlling the amount of ammonia gas injected based on the SCR system as described above, wherein the ammonia gas NH is preferably obtained according to the following formula3The conversion amount of (2):
Figure BDA0001910561730000026
wherein the content of the first and second substances,
Figure BDA0001910561730000027
denotes ammonia NH3Amount of conversion of (2), RsDenotes ammonia NH3With nitrogen oxides NOxThe stoichiometric ratio of the reaction is such that,
Figure BDA0001910561730000028
denotes nitrogen oxide NOxThe first flow rate at the inlet side of the SCR system,
Figure BDA0001910561730000029
denotes nitrogen oxide NOxA second flow rate at an exhaust side of the SCR system.
The method for controlling the ammonia gas injection amount based on the SCR system as described above, wherein preferably, the nitrogen oxide NO is obtainedxThe actual conversion efficiency of (a) specifically includes:
obtaining nitrogen oxides NOxA first flow rate at an intake side of the SCR system;
obtaining nitrogen oxides NOxA second flow rate at an exhaust side of the SCR system;
obtaining nitrogen oxide NO according to the first flow and the second flowxActual conversion efficiency of.
The method for controlling the amount of ammonia gas injected based on the SCR system as described above, wherein it is preferable that nitrogen oxide NO is obtained according to the following formulaxActual conversion efficiency of (a):
Figure BDA0001910561730000031
wherein E isaDenotes nitrogen oxide NOxThe actual conversion efficiency of the light-emitting diode,
Figure BDA0001910561730000032
it is indicated that the second flow rate is,
Figure BDA0001910561730000033
representing a first flow rate.
The method for controlling the amount of ammonia injected based on the SCR system as described above, wherein the ammonia NH is preferably selected from the group consisting of ammonia NH, ammonia3The required injection quantity of (b) is specifically obtained according to the following formula:
Figure BDA0001910561730000034
wherein the content of the first and second substances,
Figure BDA0001910561730000035
denotes ammonia NH3The required injection amount of (2) is,
Figure BDA0001910561730000036
denotes nitrogen oxide NOxFirst flow rate, R, at the inlet side of the SCR systemsDenotes ammonia NH3With nitrogen oxides NOxStoichiometric ratio of reaction, EdIndicating the required conversion efficiency.
The invention provides an ammonia gas injection amount control method based on an SCR system, and provides a method capable of balancing nitrogen oxide NOxEmission and ammonia NH3The target conversion efficiency of the leakage amount is compensated for the efficiency of the model conversion efficiency through the deviation efficiency between the target conversion efficiency and the actual conversion efficiency, and the NH of the ammonia gas is realized3Accurate control of the required injection quantity avoids ammonia NH3The problem of leakage contamination is caused by the excessively high injection amount.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an ammonia gas injection amount control method based on an SCR system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
As shown in fig. 1, an embodiment of the present invention provides an ammonia gas injection amount control method based on an SCR system, which includes the following steps:
step S1, according to ammonia NH stored in SCR system3Obtaining nitrogen oxides NOxThe model transformation efficiency of (1).
Step S2 according to nitrogen oxides NO at air inlet side of SCR systemxTo obtain nitrogen oxide NOxTarget transformation efficiency of (1).
Among them, it is noted that the SCR system is applied to nitrogen oxides NOxIs not as high as possible, nitrogen oxides NOxToo high catalytic efficiency of (A) can cause ammonia NH3Also cause pollution, and the target conversion efficiency can balance the nitrogen oxide NOxAnd ammonia NH3Is leaked.
Step S3, obtaining nitrogen oxide NOxActual conversion efficiency of.
Wherein nitrogen oxides NO are obtainedxThe actual conversion efficiency of (a) may specifically include:
step S31, obtaining nitrogen oxide NOxA first flow rate at an intake side of the SCR system.
Step S32, obtaining nitrogen oxide NOxA second flow rate at an exhaust side of the SCR system.
Step S33, obtaining nitrogen oxide NO according to the first flow and the second flowxActual conversion efficiency of.
Specifically, nitrogen oxide NO can be obtained by the following formulaxActual conversion efficiency of (a):
Figure BDA0001910561730000041
wherein E isaRepresents nitrogen oxygenCompound NOxThe actual conversion efficiency of the light-emitting diode,
Figure BDA0001910561730000042
it is indicated that the second flow rate is,
Figure BDA0001910561730000043
representing a first flow rate.
And step S4, obtaining an efficiency deviation according to the actual conversion efficiency and the target conversion efficiency.
Specifically, the efficiency deviation may be obtained by performing a difference operation between the actual conversion efficiency and the target conversion efficiency.
Specifically, the efficiency deviation can be obtained by the following formula:
ΔE＝Ea-Et
wherein Δ E represents the deviation in efficiency, EtIndicating the target conversion efficiency.
And step S5, summing the model conversion efficiency and the efficiency deviation to obtain the required conversion efficiency.
Specifically, the required conversion efficiency can be obtained by the following formula:
Ed＝Em+ΔE
wherein E isdIndicating the efficiency of the demand conversion, EmRepresenting the model conversion efficiency.
Wherein if the deviation of efficiency is a positive value, the actual conversion efficiency is greater than the target conversion efficiency, and the actual conversion efficiency is also greater than the model conversion efficiency3This will result in ammonia NH3Is sprayed in too much amount to cause ammonia NH3A large amount of leakage of the oil and the pollution to the environment; therefore, in the embodiment, the actual conversion efficiency is equal to the model conversion efficiency by calculating the efficiency deviation between the actual conversion efficiency and the target conversion efficiency and compensating the model conversion efficiency through the efficiency deviation, so that the ammonia NH is realized3Accurate control of the required injection quantity of nitrogen oxide NOxEmission amount of (2) and ammonia NH3The leakage amount of the oil is balanced.
And if the deviation of the efficiency is negative, the actual conversion efficiency is lower than the target conversion efficiency, and the actual conversion efficiency is lower than the model conversion efficiency3Will result in ammonia NH3Is injected in too small an amount to cause nitrogen oxides NOxIs insufficient to cause nitrogen oxides NOxToo high discharge capacity of (c); therefore, the efficiency deviation is used for making efficiency compensation on the model conversion efficiency to ensure that the actual conversion efficiency is equal to the model conversion efficiency, thereby realizing the ammonia NH3Accurate control of the required injection quantity of nitrogen oxide NOxEmission amount of (2) and ammonia NH3The leakage amount of the oil is balanced.
Step S6, obtaining ammonia NH according to the required conversion efficiency3The required injection amount of (3).
Wherein ammonia NH3The required injection quantity of (b) is specifically obtained according to the following formula:
Figure BDA0001910561730000051
wherein the content of the first and second substances,
Figure BDA0001910561730000052
denotes ammonia NH3The required injection amount of (2) is,
Figure BDA0001910561730000053
denotes nitrogen oxide NOxFirst flow rate, R, at the inlet side of the SCR systemsDenotes ammonia NH3With nitrogen oxides NOxStoichiometric ratio of reaction, EdIndicating the required conversion efficiency.
Wherein, before step S1, the method further comprises:
step S01 according to nitrogen oxides NO at air inlet side of SCR systemxTo obtain ammonia NH3The theoretical injection amount of (1).
Step S02, according to nitrogen at exhaust side of SCR systemOxide NOxTo obtain ammonia NH3The amount of leakage.
Step S03 based on nitrogen oxide NOxAmmonia NH consumed in chemical reactions3To obtain ammonia NH3The amount of conversion of (2).
Wherein the ammonia NH can be obtained according to the following formula3The conversion amount of (2):
Figure BDA0001910561730000061
wherein the content of the first and second substances,
Figure BDA0001910561730000062
denotes ammonia NH3Amount of conversion of (2), RsDenotes ammonia NH3With nitrogen oxides NOxThe stoichiometric ratio of the reaction is such that,
Figure BDA0001910561730000063
denotes nitrogen oxide NOxThe first flow rate at the inlet side of the SCR system,
Figure BDA0001910561730000064
denotes nitrogen oxide NOxA second flow rate at an exhaust side of the SCR system.
It is understood that the first flow rate and the second flow rate may be detected by providing sensors at the intake side and the exhaust side of the SCR system, respectively.
Step S04, based on ammonia NH3Obtaining ammonia NH by the theoretical injection amount, leakage amount and conversion amount3The amount stored in the SCR system.
Specifically, NH may be obtained according to the following formula3Amount stored in the SCR system:
Figure BDA0001910561730000065
wherein the content of the first and second substances,
Figure BDA0001910561730000066
indicating NH in SCR systems3T represents nitrogen oxide NOxThe time elapsed from entering the SCR system to exiting the SCR system after the reaction is complete,
Figure BDA0001910561730000067
denotes ammonia NH3The amount of injection on the intake side of the SCR system,
Figure BDA0001910561730000068
denotes ammonia NH3The amount of leakage at the exhaust side of the SCR system,
Figure BDA0001910561730000069
denotes ammonia NH3In the presence of nitrogen oxides NOxThe amount of conversion in the reaction.
It is understood that ammonia NH may be detected by providing a sensor on the exhaust side of the SCR3The amount of leakage.
The embodiment of the invention provides an ammonia gas injection amount control method based on an SCR system, and provides a method capable of balancing nitrogen oxide NOxEmission and ammonia NH3The target conversion efficiency of the leakage amount is compensated for the efficiency of the model conversion efficiency through the deviation efficiency between the target conversion efficiency and the actual conversion efficiency, and the NH of the ammonia gas is realized3Accurate control of the required injection quantity avoids ammonia NH3The problem of leakage contamination is caused by the excessively high injection amount.
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.

Claims (5)

1. An ammonia gas injection amount control method based on an SCR system is characterized by comprising the following steps:
according to storage in SCR systemsAmmonia NH3Obtaining nitrogen oxides NOxThe model conversion efficiency of (3);
according to nitrogen oxide NO at air inlet side of SCR systemxTo obtain nitrogen oxide NOxTarget transformation efficiency of (a);
obtaining nitrogen oxides NOxActual conversion efficiency of;
obtaining an efficiency deviation according to the actual conversion efficiency and the target conversion efficiency;
summing the model conversion efficiency and the efficiency deviation to obtain the required conversion efficiency;
obtaining ammonia NH according to the required conversion efficiency3The required injection amount of (3);
ammonia NH stored in SCR-based systems3Obtaining nitrogen oxides NOxBefore the model of (2) transforms efficiency, the method further comprises:
according to nitrogen oxide NO at air inlet side of SCR systemxTo obtain ammonia NH3The theoretical injection amount of (4);
according to nitrogen oxides NO on the exhaust side of the SCR systemxTo obtain ammonia NH3The amount of leakage of;
according to nitrogen oxides NOxAmmonia NH consumed in chemical reactions3To obtain ammonia NH3The amount of conversion of (a);
according to the ammonia NH3Obtaining ammonia NH by the theoretical injection amount, leakage amount and conversion amount3An amount stored in the SCR system;
NH was obtained according to the following formula3Amount stored in the SCR system:
Figure FDA0002363234240000011
wherein the content of the first and second substances,
Figure FDA0002363234240000012
indicating NH in SCR systems3T represents nitrogen oxide NOxFrom entering SCR systemThe time elapsed until the reaction is completed and discharged from the SCR system,
Figure FDA0002363234240000013
denotes ammonia NH3The amount of injection on the intake side of the SCR system,
Figure FDA0002363234240000014
denotes ammonia NH3The amount of leakage at the exhaust side of the SCR system,
Figure FDA0002363234240000015
denotes ammonia NH3In the presence of nitrogen oxides NOxThe amount of conversion in the reaction.
2. The SCR system-based ammonia gas injection amount control method according to claim 1, wherein the ammonia gas NH is obtained according to the following formula3The conversion amount of (2):
Figure FDA0002363234240000021
wherein the content of the first and second substances,
Figure FDA0002363234240000022
denotes ammonia NH3Amount of conversion of (2), RsDenotes ammonia NH3With nitrogen oxides NOxThe stoichiometric ratio of the reaction is such that,
Figure FDA0002363234240000023
denotes nitrogen oxide NOxThe first flow rate at the inlet side of the SCR system,
Figure FDA0002363234240000024
denotes nitrogen oxide NOxA second flow rate at an exhaust side of the SCR system.
3. The SCR system based ammonia injection amount control method of claim 1, whereinThereby obtaining nitrogen oxide NOxThe actual conversion efficiency of (a) specifically includes:
obtaining nitrogen oxides NOxA first flow rate at an intake side of the SCR system;
obtaining nitrogen oxides NOxA second flow rate at an exhaust side of the SCR system;
obtaining nitrogen oxide NO according to the first flow and the second flowxActual conversion efficiency of.
4. The SCR system based ammonia injection amount control method according to claim 3, wherein the nitrogen oxide NO is obtained according to the following formulaxActual conversion efficiency of (a):
Figure FDA0002363234240000025
wherein E isaDenotes nitrogen oxide NOxThe actual conversion efficiency of the light-emitting diode,
Figure FDA0002363234240000028
it is indicated that the second flow rate is,
Figure FDA0002363234240000026
representing a first flow rate.
5. The SCR system based ammonia injection amount control method of claim 1, wherein the ammonia NH is3The required injection quantity of (b) is specifically obtained according to the following formula:
Figure FDA0002363234240000027
wherein the content of the first and second substances,
Figure FDA0002363234240000029
denotes ammonia NH3The required injection amount of (2) is,
Figure FDA00023632342400000210
denotes nitrogen oxide NOxFirst flow rate, R, at the inlet side of the SCR systemsDenotes ammonia NH3With nitrogen oxides NOxStoichiometric ratio of reaction, EdIndicating the required conversion efficiency.
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CN106762042A (en) * 2016-11-14 2017-05-31 北京工业大学 A kind of engine SCR system ammonia leakage control method
CN108087066A (en) * 2016-11-23 2018-05-29 通用汽车环球科技运作有限责任公司 For the Model Predictive Control of multipot type selective catalytic reduction system operating
CN108915825A (en) * 2018-06-29 2018-11-30 郑州精益达环保科技有限公司 A kind of machinery pump engine SCR control strategy

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9133749B2 (en) * 2009-07-10 2015-09-15 Kevin Andrew Gady Ammonia storage set-point control for selective catalytic reduction applications
CN102619601A (en) * 2012-04-18 2012-08-01 潍柴动力扬州柴油机有限责任公司 SCR (Selective Catalytic Reduction) system of electrical control diesel engine and control method of SCR system
CN106762042A (en) * 2016-11-14 2017-05-31 北京工业大学 A kind of engine SCR system ammonia leakage control method
CN108087066A (en) * 2016-11-23 2018-05-29 通用汽车环球科技运作有限责任公司 For the Model Predictive Control of multipot type selective catalytic reduction system operating
CN108915825A (en) * 2018-06-29 2018-11-30 郑州精益达环保科技有限公司 A kind of machinery pump engine SCR control strategy

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